subject:(current sharing)

University of Waterloo

1. Alsiraji, Hasan. Cooperative Power Sharing control in Multi-terminal VSC-HVDC.

Degree: 2014, University of Waterloo

► The Multi-terminal high voltage DC (MTDC) system is a viable solution for increasing an electrical power generation to interconnect renewable resources into an AC grid.… (more)

Subjects/Keywords: active power control; current control; economic power control; fixed power sharing; HVDC system; MTDC-VSC; power sharing; proportional power sharing

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APA (6^th Edition):

Alsiraji, H. (2014). Cooperative Power Sharing control in Multi-terminal VSC-HVDC. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/8800

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Alsiraji, Hasan. “Cooperative Power Sharing control in Multi-terminal VSC-HVDC.” 2014. Thesis, University of Waterloo. Accessed January 20, 2021. http://hdl.handle.net/10012/8800.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Alsiraji, Hasan. “Cooperative Power Sharing control in Multi-terminal VSC-HVDC.” 2014. Web. 20 Jan 2021.

Vancouver:

Alsiraji H. Cooperative Power Sharing control in Multi-terminal VSC-HVDC. [Internet] [Thesis]. University of Waterloo; 2014. [cited 2021 Jan 20]. Available from: http://hdl.handle.net/10012/8800.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Alsiraji H. Cooperative Power Sharing control in Multi-terminal VSC-HVDC. [Thesis]. University of Waterloo; 2014. Available from: http://hdl.handle.net/10012/8800

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Manchester

2. Malkin, Daniel Patrick. Current Steering in DC Superconducting Electrical Systems for Aerospace.

Degree: 2019, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318467

► Reduced emissions and greater fuel efficiency in the aerospace industry is the focus of current research and literature. The Flightpath 2050 initiative is a large… (more)

▼ Reduced emissions and greater fuel efficiency in the aerospace industry is the focus of current research and literature. The Flightpath 2050 initiative is a large driving force behind this, as the initiative requires a 75% reduction in C02 emissions per passenger kilometre by 2050 when compared to C02 emissions in 2000 [1]. The drive for greater fuel efficiency and reduced emissions is also partly due to fuel costs and airline competition. Current research suggests that the use of conventional conductors and machines becomes more problematic the higher the power levels rise, due to size and weight of the conductors for the required power level. However, in [2] the authors discuss the possibility of utilising a DC superconducting system. If a superconducting electrical system was to be designed it may be fair to assume that the architecture would include parallel superconducting cables. However, because of the zero resistance under DC conditions in the superconductor, it is uncertain how two parallel superconducting cables would share their current as in normal conductors the resistance defines the current sharing. A basic Simulink model was designed and simulated to establish how the current would share in two parallel superconducting DC cables. The cable inductance was found to be a significant factor in current sharing. This was tested experimentally using two parallel YBCO wires in a superconducting test tank at 77K. The experimental results closely matched with the MATLAB model, thus validating the model. If the current sharing is asymmetric a current steering device would be needed to balance the currents in the branches of the circuit, to avoid the risk of one branch superconducting quenching and all the issues associated with it. Various possible solutions were simulated in MATLAB Simulink model; the optimal solution was to inject a DC voltage into a superconducting branch, the increase in voltage would modify the current in that branch and this changes the current distribution in the other superconducting branches. A current steering device with a coil wound around a ferrite core was designed and built to inject the DC voltage. This was then put in the superconducting test tank with one of the YBCO superconducting branches passing through the core window and tested experimentally. The experiment successfully demonstrated that the current can be steered from one superconducting branch to another by injecting a DC voltage into one of the superconducting branches, thus validating the MATLAB Simulink model. Advisors/Committee Members: DUROVIC, SINISA S, Smith, Sandy, Durovic, Sinisa.

Subjects/Keywords: Superconducting current sharing; Superconducting current steering; Future aircraft electrical systems; Distributed electrical aerospace electrical systems

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APA (6^th Edition):

Malkin, D. P. (2019). Current Steering in DC Superconducting Electrical Systems for Aerospace. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318467

Chicago Manual of Style (16^th Edition):

Malkin, Daniel Patrick. “Current Steering in DC Superconducting Electrical Systems for Aerospace.” 2019. Doctoral Dissertation, University of Manchester. Accessed January 20, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318467.

MLA Handbook (7^th Edition):

Malkin, Daniel Patrick. “Current Steering in DC Superconducting Electrical Systems for Aerospace.” 2019. Web. 20 Jan 2021.

Vancouver:

Malkin DP. Current Steering in DC Superconducting Electrical Systems for Aerospace. [Internet] [Doctoral dissertation]. University of Manchester; 2019. [cited 2021 Jan 20]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318467.

Council of Science Editors:

Malkin DP. Current Steering in DC Superconducting Electrical Systems for Aerospace. [Doctoral Dissertation]. University of Manchester; 2019. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318467

Delft University of Technology

3. Kumar, Naveen (author). Design and Decentralized Control of Bi-directional Flyback.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:310d540e-169a-45d7-b2c1-57ec2855f839

►

A large part of the global population is still living without the access to electricity. The interconnected solar home system (SHS) has been purposed as… (more)

Subjects/Keywords: Bi-directional Flyback; Decentralized Control,; Load sharing; Voltage Regulation; Current Control

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APA (6^th Edition):

Kumar, N. (. (2018). Design and Decentralized Control of Bi-directional Flyback. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:310d540e-169a-45d7-b2c1-57ec2855f839

Chicago Manual of Style (16^th Edition):

Kumar, Naveen (author). “Design and Decentralized Control of Bi-directional Flyback.” 2018. Masters Thesis, Delft University of Technology. Accessed January 20, 2021. http://resolver.tudelft.nl/uuid:310d540e-169a-45d7-b2c1-57ec2855f839.

MLA Handbook (7^th Edition):

Kumar, Naveen (author). “Design and Decentralized Control of Bi-directional Flyback.” 2018. Web. 20 Jan 2021.

Vancouver:

Kumar N(. Design and Decentralized Control of Bi-directional Flyback. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Jan 20]. Available from: http://resolver.tudelft.nl/uuid:310d540e-169a-45d7-b2c1-57ec2855f839.

Council of Science Editors:

Kumar N(. Design and Decentralized Control of Bi-directional Flyback. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:310d540e-169a-45d7-b2c1-57ec2855f839

RMIT University

4. Shoeiby, B. Current regulator based control strategy for islanded and grid-connected microgrids.

Degree: 2015, RMIT University

URL: http://researchbank.rmit.edu.au/view/rmit:161380

► Distributed generation has been primarily developed to harvest renewable energy resources such as wind and sunlight. Due to low unit power capacity and dispersed unit… (more)

▼ Distributed generation has been primarily developed to harvest renewable energy resources such as wind and sunlight. Due to low unit power capacity and dispersed unit placement, integration of distributed generators is facilitated if a cluster of generation sources and their dependent loads are considered as one self-controlled network, commonly referred to as a microgrid. This thesis presents a new control strategy that allows microgrids to continuously operate with current controlled inverter based distributed generators. This approach offers significant benefits over the conventional voltage control strategies used for these inverters. A microgrid must be controlled carefully to operate according to a set of desired requirements such as voltage and frequency regulation criteria. It is desirable that the distributed generators share active and reactive power generation equally between themselves in order to increase the reliability of the microgrid, and a microgrid also has to be able to connect to or disconnect from the main utility grid with a smooth and seamless process. This thesis starts by investigating the present common method for microgrids known as droop control. It is shown that existing strategies that use voltage controlled converters and droop control have a number of significant shortcomings. These include slow dynamics due to the structure of dual-loop voltage controllers; poor performance of voltage controllers compared to current regulators; sluggish power sharing response as a result of feeding back the measurement of the generated powers in the droop function; and significant sensitivity to the microgrid structure and impedance of the distribution lines. Next, a new method for controlling the distributed generators in a microgrid using current controlled converters is proposed, challenging the commonly accepted belief that current regulators cannot be used with an islanded microgrid and actually achieving superior performance compared to the common voltage control based approach. The new strategy calculates the reference of the current controlled converters without making any changes to the current controller structure, using a simple predictive voltage controller that does not compromise the current controller’s dynamic performance. Furthermore, by using a hitherto undiscovered characteristic of PR resonant linear regulators in the stationary reference frame, automatic frequency and load power factor matching is readily achieved. Finally, a new algorithm is proposed to implement a droop function for current controlled distributed generators, which achieves equally shared rated power. Finally, the applicability of the proposed control strategy is analysed in various situations that can be expected in a real world microgrid. Scenarios investigated include operation in islanded and grid-connected modes and the transition between the two; supplying power to a various range of loads; implementation of the microgrid in single-phase as well as three-phase; application for low voltage or…

Subjects/Keywords: Fields of Research; microgrid; distributed generation; current regulation; droop control; power sharing; resonant current control; power electronics; voltage source inverter

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APA (6^th Edition):

Shoeiby, B. (2015). Current regulator based control strategy for islanded and grid-connected microgrids. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:161380

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shoeiby, B. “Current regulator based control strategy for islanded and grid-connected microgrids.” 2015. Thesis, RMIT University. Accessed January 20, 2021. http://researchbank.rmit.edu.au/view/rmit:161380.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shoeiby, B. “Current regulator based control strategy for islanded and grid-connected microgrids.” 2015. Web. 20 Jan 2021.

Vancouver:

Shoeiby B. Current regulator based control strategy for islanded and grid-connected microgrids. [Internet] [Thesis]. RMIT University; 2015. [cited 2021 Jan 20]. Available from: http://researchbank.rmit.edu.au/view/rmit:161380.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shoeiby B. Current regulator based control strategy for islanded and grid-connected microgrids. [Thesis]. RMIT University; 2015. Available from: http://researchbank.rmit.edu.au/view/rmit:161380

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech

5. Wu, Haoran. Multi-Channel Constant Current (MC3) LED Driver for Indoor LED Luminaries.

Degree: MS, Electrical and Computer Engineering, 2011, Virginia Tech

URL: http://hdl.handle.net/10919/35727

► Recently, as a promising lighting source, light-emitting diodes (LEDs) have become more and more attractive and have great opportunity to replace traditional lighting sources -… (more)

▼ Recently, as a promising lighting source, light-emitting diodes (LEDs) have become more and more attractive and have great opportunity to replace traditional lighting sources - incandescent, fluorescent and HID because of the advantages such as high luminous efficacy, long lifetime, quick on/off time, wide color gamut, eco-friendly etc. Based on the research from U.S. Department of Energy, over 30% of total electric consumption in U.S. each year is for lighting, 75% of which are for indoor lighting (including both residential and commercial buildings). In the indoor LED lighting application, to provide multiple current source outputs for multiple LED strings, traditional solutions usually adopt a two-stage structure, which is complicated and cost-ineffective. How to design a simple, low-cost and efficient LED driver with multiple current source outputs is in great demand and really challenging. In this thesis, a single-stage multi-channel constant current (MC3) LED driver structure has been proposed. Multiple transformer structure is utilized to provide multiple current source outputs. The current control scheme is also simple - only one LED string current is sensed and controlled; other strings' currents are cross regulated. Firstly, a PWM half bridge topology is chosen to implement the proposed single-stage MC3 LED driver concept. In order to analyze the current cross regulation, a general model is derived. The circuit has been simulated under various LED load conditions to verify its good current sharing capability. In order to further improve efficiency, simplify the driver's complexity and reduce cost, a LLC resonant topology is also investigated. LLC current gain characteristic has been derived by considering LED's i-v character and a design procedure is developed. A 100 kHz, 200 W, 4-string MC3 LLC LED driver is designed and tested. The experimental results show that the driver can maintain constant current output within the whole input and output variations, achieve good efficiency and realize current sharing under both balanced and unbalanced LED conditions. The dimming function can also be realized through frequency modulation method and burst mode control method. As a conclusion, a single-stage MC3 LED driver concept is proposed and implemented with two topologies. The proposed idea provides a simple, low-cost and efficient solution for indoor LED lighting application with multiple LED string configuration. It also has good current sharing capability and robustness to LED forward voltage variations or short failures. Advisors/Committee Members: Lee, Fred C. (committeechair), Mattavelli, Paolo (committee member), Stilwell, Daniel J. (committee member).

Subjects/Keywords: Multi-channel constant current (MC3) LED driver; Current sharing; Light-emitting diode (LED); Dimming; LLC resonant converter

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APA (6^th Edition):

Wu, H. (2011). Multi-Channel Constant Current (MC3) LED Driver for Indoor LED Luminaries. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/35727

Chicago Manual of Style (16^th Edition):

Wu, Haoran. “Multi-Channel Constant Current (MC3) LED Driver for Indoor LED Luminaries.” 2011. Masters Thesis, Virginia Tech. Accessed January 20, 2021. http://hdl.handle.net/10919/35727.

MLA Handbook (7^th Edition):

Wu, Haoran. “Multi-Channel Constant Current (MC3) LED Driver for Indoor LED Luminaries.” 2011. Web. 20 Jan 2021.

Vancouver:

Wu H. Multi-Channel Constant Current (MC3) LED Driver for Indoor LED Luminaries. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2021 Jan 20]. Available from: http://hdl.handle.net/10919/35727.

Council of Science Editors:

Wu H. Multi-Channel Constant Current (MC3) LED Driver for Indoor LED Luminaries. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/35727

Arizona State University

6. Strele, Thomas Arthur. Power Management for Fuel Cell and Battery Hybrid Unmanned Aerial Vehicle Applications.

Degree: Engineering, 2016, Arizona State University

URL: http://repository.asu.edu/items/40735

► As electric powered unmanned aerial vehicles enter a new age of commercial viability, market opportunities in the small UAV sector are expanding. Extending UAV flight… (more)

▼ As electric powered unmanned aerial vehicles enter a new age of commercial viability, market opportunities in the small UAV sector are expanding. Extending UAV flight time through a combination of fuel cell and battery technologies enhance the scope of potential applications. A brief survey of UAV history provides context and examples of modern day UAVs powered by fuel cells are given. Conventional hybrid power system management employs DC-to-DC converters to control the power split between battery and fuel cell. In this study, a transistor replaces the DC-to-DC converter which lowers weight and cost. Simulation models of a lithium ion battery and a proton exchange membrane fuel cell are developed and integrated into a UAV power system model. Flight simulations demonstrate the operation of the transistor-based power management scheme and quantify the amount of hydrogen consumed by a 5.5 kg fixed wing UAV during a six hour flight. Battery power assists the fuel cell during high throttle periods but may also augment fuel cell power during cruise flight. Simulations demonstrate a 60 liter reduction in hydrogen consumption when battery power assists the fuel cell during cruise flight. Over the full duration of the flight, averaged efficiency of the power system exceeds 98%. For scenarios where inflight battery recharge is desirable, a constant current battery charger is integrated into the UAV power system. Simulation of inflight battery recharge is performed. Design of UAV hybrid power systems must consider power system weight against potential flight time. Data from the flight simulations are used to identify a simple formula that predicts flight time as a function of energy stored onboard the modeled UAV. A small selection of commercially available batteries, fuel cells, and compressed air storage tanks are listed to characterize the weight of possible systems. The formula is then used in conjunction with the weight data to generate a graph of power system weight versus potential flight times. Combinations of the listed batteries, fuel cells, and storage tanks are plotted on the graph to evaluate various hybrid power system configurations.

Subjects/Keywords: Alternative energy; Aerospace engineering; Electrical engineering; Current Sharing; Fuel Cell; Hybrid Power Management; UAV

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APA (6^th Edition):

Strele, T. A. (2016). Power Management for Fuel Cell and Battery Hybrid Unmanned Aerial Vehicle Applications. (Masters Thesis). Arizona State University. Retrieved from http://repository.asu.edu/items/40735

Chicago Manual of Style (16^th Edition):

Strele, Thomas Arthur. “Power Management for Fuel Cell and Battery Hybrid Unmanned Aerial Vehicle Applications.” 2016. Masters Thesis, Arizona State University. Accessed January 20, 2021. http://repository.asu.edu/items/40735.

MLA Handbook (7^th Edition):

Strele, Thomas Arthur. “Power Management for Fuel Cell and Battery Hybrid Unmanned Aerial Vehicle Applications.” 2016. Web. 20 Jan 2021.

Vancouver:

Strele TA. Power Management for Fuel Cell and Battery Hybrid Unmanned Aerial Vehicle Applications. [Internet] [Masters thesis]. Arizona State University; 2016. [cited 2021 Jan 20]. Available from: http://repository.asu.edu/items/40735.

Council of Science Editors:

Strele TA. Power Management for Fuel Cell and Battery Hybrid Unmanned Aerial Vehicle Applications. [Masters Thesis]. Arizona State University; 2016. Available from: http://repository.asu.edu/items/40735

Virginia Tech

7. Prasantanakorn, Chanwit. Current Sharing Method for DC-DC Transformers.

Degree: MS, Electrical and Computer Engineering, 2011, Virginia Tech

URL: http://hdl.handle.net/10919/31112

► An ever present trend in the power conversion industry is to get higher performance at a lower cost. In a computer server system, the front-end… (more)

▼ An ever present trend in the power conversion industry is to get higher performance at a lower cost. In a computer server system, the front-end converter, supplying the load subsystems, is typically a multiple output power supply. The power supply unit is custom designed and its output voltages are fully regulated, so it is not very efficient or cost effective. Most of the load systems in this application are supplied by point-of-load converters (POLs). By leaving the output voltage regulation aspect to POLs, the front-end converter does not need to be a fully regulated, multiple output converter. It can be replaced by a dc-dc transformer (DCX), which is a semi-regulated or unregulated, single output dc-dc converter. A DCX can be made using a modular design to simplify expansion of the system capacity. To realize this concept, the DCX block must have a current sharing feature. The current sharing method for a resonant DCX is discussed in this work. To simplify the system architecture, the current sharing method is based on the droop method, which requires no communication between paralleled units. With this method, the current sharing error is inversely proportional to the droop voltage. In traditional DCX implementations, the droop voltage depends on the resistive voltage drops in the power stage, which is not sufficient to achieve the desired current sharing error. The resonant converter has the inherent characteristic that its conversion gain depends on the load current, so the virtual droop resistance can realized by the resonant tank and the droop voltage can be obtained without incurring conduction loss. An LLC resonant converter is investigated for its droop characteristic. The study shows the required droop voltage is achievable at very high switching frequency. To lower the switching frequency, a notch filter is introduced into the LLC resonant tank to increase the sensitivity of the conversion gain versus the operating frequency. The design of the multi-element resonant tank is discussed. Depending soly on the resonant tank, the droop characteristic is largely varied with the component tolerance in the resonant tank. The current sharing error becomes unacceptable. The active droop control is imposed to make the output regulation characteristic insensitive to the component tolerance. The proposed resonant DCX has simpler circuit structure than the fully regulated resonant converter. Finally simulation and experimental results are presented to verify this concept. Advisors/Committee Members: Lee, Fred C. (committeechair), Boroyevich, Dushan (committee member), Mattavelli, Paolo (committee member).

Subjects/Keywords: Multi-element resonant tank; DCX; DC-DC transformer; Droop current sharing; LLC resonant converter

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APA (6^th Edition):

Prasantanakorn, C. (2011). Current Sharing Method for DC-DC Transformers. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/31112

Chicago Manual of Style (16^th Edition):

Prasantanakorn, Chanwit. “Current Sharing Method for DC-DC Transformers.” 2011. Masters Thesis, Virginia Tech. Accessed January 20, 2021. http://hdl.handle.net/10919/31112.

MLA Handbook (7^th Edition):

Prasantanakorn, Chanwit. “Current Sharing Method for DC-DC Transformers.” 2011. Web. 20 Jan 2021.

Vancouver:

Prasantanakorn C. Current Sharing Method for DC-DC Transformers. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2021 Jan 20]. Available from: http://hdl.handle.net/10919/31112.

Council of Science Editors:

Prasantanakorn C. Current Sharing Method for DC-DC Transformers. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/31112

Arizona State University

8. Sun, Ming. Digital Controlled Multi-phase Buck Converter with Accurate Voltage and Current Control.

Degree: Electrical Engineering, 2017, Arizona State University

URL: http://repository.asu.edu/items/46206

► A 4-phase, quasi-current-mode hysteretic buck converter with digital frequency synchronization, online comparator offset-calibration and digital current sharing control is presented. The switching frequency of the… (more)

Subjects/Keywords: Electrical engineering; Buck; Current Sharing; DC-DC; Hysteretic; Multi-phase; Phase Synchronization

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APA (6^th Edition):

Sun, M. (2017). Digital Controlled Multi-phase Buck Converter with Accurate Voltage and Current Control. (Doctoral Dissertation). Arizona State University. Retrieved from http://repository.asu.edu/items/46206

Chicago Manual of Style (16^th Edition):

Sun, Ming. “Digital Controlled Multi-phase Buck Converter with Accurate Voltage and Current Control.” 2017. Doctoral Dissertation, Arizona State University. Accessed January 20, 2021. http://repository.asu.edu/items/46206.

MLA Handbook (7^th Edition):

Sun, Ming. “Digital Controlled Multi-phase Buck Converter with Accurate Voltage and Current Control.” 2017. Web. 20 Jan 2021.

Vancouver:

Sun M. Digital Controlled Multi-phase Buck Converter with Accurate Voltage and Current Control. [Internet] [Doctoral dissertation]. Arizona State University; 2017. [cited 2021 Jan 20]. Available from: http://repository.asu.edu/items/46206.

Council of Science Editors:

Sun M. Digital Controlled Multi-phase Buck Converter with Accurate Voltage and Current Control. [Doctoral Dissertation]. Arizona State University; 2017. Available from: http://repository.asu.edu/items/46206

Queens University

9. Hu, Zhiyuan. Topology, Control, and Design of LLC Resonant Converters .

Degree: Electrical and Computer Engineering, 2014, Queens University

URL: http://hdl.handle.net/1974/12346

► Data centers and supercomputers have become the backbone to support today’s scientific researches, economic developments, and individual lives. The power consumption of data centers and… (more)

▼ Data centers and supercomputers have become the backbone to support today’s scientific researches, economic developments, and individual lives. The power consumption of data centers and supercomputers are enormously high, bringing the urgency of improving energy efficiency of the power conversion systems. The LLC resonant converter emerged in recent years. As an element of the front-end AC-DC power conversion systems, it brought significant efficiency improvement and has been popularly deployed. However, surrounding the LLC topology there are still several problems unsolved, including: (a) interleaving problem, (b) current sensing problem, (c) poor dynamic performance problem, and (d) peak gain design problem. The works in this thesis include several original ideas to solve above problems: Firstly, an SCC-LLC topology is proposed, featuring constant switching frequency operation to solve the interleaving problem. Secondly, theoretical analysis reveals that the constant frequency operation compromises the converter’s operation range to some degree. A new control strategy featuring variable switching frequency is proposed to achieve lower cost and better performance than its constant frequency counterpart. Thirdly, upon solving the interleaving problem, it is recognized that existing current sensing methods bring inaccuracy to the load sharing performance, as well as low bandwidth to the current-mode control. A cycle-by-cycle average input current sensing method is proposed obtain per-cycle average input current based on sampling the resonant capacitor voltage, which is simple, accurate, with no delay, and virtually has no cost. Fourthly, inspired by the cycle-by-cycle average input current sensing method, a Bang-Bang Charge Control (BBCC) method is proposed to achieve very fast dynamic performance. The feedback loop bandwidth can achieve 1/6 of switching frequency at all operation conditions. Lastly, it is recognized that the design method of the LLC converter lacks an accurate and comprehensive mathematical solution. An accurate design algorithm is derived based on time-domain analysis to identify all the possible designs that provide the exact peak gain. The results of this algorithm will help identify the optimal design. Simulation models are developed to prove the accuracy of the proposed theories and algorithms. Prototype circuits are built to demonstrate the advantages of the proposed circuits and control methods.

Subjects/Keywords: load sharing ; switched-mode power supplies ; current sensing ; charge control ; Resonant power conversion ; transient response ; interleaving

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APA (6^th Edition):

Hu, Z. (2014). Topology, Control, and Design of LLC Resonant Converters . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/12346

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hu, Zhiyuan. “Topology, Control, and Design of LLC Resonant Converters .” 2014. Thesis, Queens University. Accessed January 20, 2021. http://hdl.handle.net/1974/12346.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hu, Zhiyuan. “Topology, Control, and Design of LLC Resonant Converters .” 2014. Web. 20 Jan 2021.

Vancouver:

Hu Z. Topology, Control, and Design of LLC Resonant Converters . [Internet] [Thesis]. Queens University; 2014. [cited 2021 Jan 20]. Available from: http://hdl.handle.net/1974/12346.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hu Z. Topology, Control, and Design of LLC Resonant Converters . [Thesis]. Queens University; 2014. Available from: http://hdl.handle.net/1974/12346

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Arizona State University

10. Talele, Bhushan. Load Sharing Low Dropout Regulators Using Accurate Current Sensing.

Degree: Electrical Engineering, 2017, Arizona State University

URL: http://repository.asu.edu/items/46344

Subjects/Keywords: Electrical engineering; Current Sensing; Load Sharing; Low Dropout Regulators

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APA (6^th Edition):

Talele, B. (2017). Load Sharing Low Dropout Regulators Using Accurate Current Sensing. (Masters Thesis). Arizona State University. Retrieved from http://repository.asu.edu/items/46344

Chicago Manual of Style (16^th Edition):

Talele, Bhushan. “Load Sharing Low Dropout Regulators Using Accurate Current Sensing.” 2017. Masters Thesis, Arizona State University. Accessed January 20, 2021. http://repository.asu.edu/items/46344.

MLA Handbook (7^th Edition):

Talele, Bhushan. “Load Sharing Low Dropout Regulators Using Accurate Current Sensing.” 2017. Web. 20 Jan 2021.

Vancouver:

Talele B. Load Sharing Low Dropout Regulators Using Accurate Current Sensing. [Internet] [Masters thesis]. Arizona State University; 2017. [cited 2021 Jan 20]. Available from: http://repository.asu.edu/items/46344.

Council of Science Editors:

Talele B. Load Sharing Low Dropout Regulators Using Accurate Current Sensing. [Masters Thesis]. Arizona State University; 2017. Available from: http://repository.asu.edu/items/46344

Virginia Tech

11. Sun, Juanjuan. Dynamic Performance Analyses of Current Sharing Control for DC/DC Converters.

Degree: PhD, Electrical and Computer Engineering, 2007, Virginia Tech

URL: http://hdl.handle.net/10919/28071

► Paralleling operation of DC/DC converters is widely used in today's distributed power systems. To ensure balanced output currents among paralleled power modules, current sharing control… (more)

▼ Paralleling operation of DC/DC converters is widely used in today's distributed power systems. To ensure balanced output currents among paralleled power modules, current sharing control is usually necessary.Active current sharing controls with current feedback mechanism are widely used in today's power supplies. However, the dynamic performance of these current sharing control schemes are not yet clearly explored. In this work, the dynamic current sharing performance is evaluated for paralleling systems with the output impedance approach. As the representative of the terminal characteristic of a power converter, output impedance is a powerful tool to study the dynamic response under load transients. The dynamic current sharing analyses are then conducted for three different active current sharing control structures and a comprehensive comparison among them helps the designer to choose appropriate controls for different applications. On the other hand, high-frequency load transients are possible to happen for voltage regulators, which are the power supplies of microprocessors. In order to study the dynamic current sharing performance for a paralleling system when the perturbation frequency is higher than half of the switching frequency,the conventional output impedance concept needs to be extended. Due to the non-linear behavior of a switching modulator, the beat-frequency phenomenon could cause unexpected failure of a power supply when the perturbation frequency is close to the switching frequency. To address this issue, an unconventional multi-frequency model is proposed for high-frequency dynamic current sharing studies. With this model, the sideband components are possible to be included and the beat-frequency oscillations can be predicted. After that, the conventional impedance concept is expanded in the form of extended describing function, so that the terminal characteristics of paralleled converters are represented by a series of impedances. Besides the analyses, this work also proposed several solutions for the beat-frequency oscillation issue which are experimentally verified. In summary, both low-frequency and high-frequency dynamic current sharing performances are studied in this dissertation. The output impedance concept and its extension in the form of extended describing function are utilized as the tools for researches. With these powerful tools, more insights are obtained to help better design of a paralleling system. Advisors/Committee Members: Lee, Fred C. (committeechair), Wang, Fei Fred (committee member), Liu, Yilu (committee member), Nelson, Douglas J. (committee member), Xu, Ming (committee member).

Subjects/Keywords: dynamic performance; high frequency; distributed power systems; current sharing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sun, J. (2007). Dynamic Performance Analyses of Current Sharing Control for DC/DC Converters. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/28071

Chicago Manual of Style (16^th Edition):

Sun, Juanjuan. “Dynamic Performance Analyses of Current Sharing Control for DC/DC Converters.” 2007. Doctoral Dissertation, Virginia Tech. Accessed January 20, 2021. http://hdl.handle.net/10919/28071.

MLA Handbook (7^th Edition):

Sun, Juanjuan. “Dynamic Performance Analyses of Current Sharing Control for DC/DC Converters.” 2007. Web. 20 Jan 2021.

Vancouver:

Sun J. Dynamic Performance Analyses of Current Sharing Control for DC/DC Converters. [Internet] [Doctoral dissertation]. Virginia Tech; 2007. [cited 2021 Jan 20]. Available from: http://hdl.handle.net/10919/28071.

Council of Science Editors:

Sun J. Dynamic Performance Analyses of Current Sharing Control for DC/DC Converters. [Doctoral Dissertation]. Virginia Tech; 2007. Available from: http://hdl.handle.net/10919/28071

Queens University

12. Guo, Wennan. Digital Control of Voltage Regulators for Fast Transient Response in Computer Applications .

Degree: Electrical and Computer Engineering, 2015, Queens University

URL: http://hdl.handle.net/1974/13466

► In this thesis, three techniques are proposed to enhance the transient performance of voltage regulators (VR) for computer applications. Voltage mode control with load line… (more)

Subjects/Keywords: voltage regulator ; digital controller ; switch mode power supply ; dc-dc power converter ; non-linear control ; predictive control ; multiphase interleaved buck converter ; current sharing ; current balancing

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APA (6^th Edition):

Guo, W. (2015). Digital Control of Voltage Regulators for Fast Transient Response in Computer Applications . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/13466

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Guo, Wennan. “Digital Control of Voltage Regulators for Fast Transient Response in Computer Applications .” 2015. Thesis, Queens University. Accessed January 20, 2021. http://hdl.handle.net/1974/13466.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Guo, Wennan. “Digital Control of Voltage Regulators for Fast Transient Response in Computer Applications .” 2015. Web. 20 Jan 2021.

Vancouver:

Guo W. Digital Control of Voltage Regulators for Fast Transient Response in Computer Applications . [Internet] [Thesis]. Queens University; 2015. [cited 2021 Jan 20]. Available from: http://hdl.handle.net/1974/13466.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Guo W. Digital Control of Voltage Regulators for Fast Transient Response in Computer Applications . [Thesis]. Queens University; 2015. Available from: http://hdl.handle.net/1974/13466

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Arizona State University

13. Burli, Venkatesh. An Inductor Emulator Approach to Peak Current-mode Control in a 4-Phase Buck Regulator.

Degree: Electrical Engineering, 2017, Arizona State University

URL: http://repository.asu.edu/items/46244

Subjects/Keywords: Electrical engineering; Current-Sharing; DC-DC Converters; Inductor Current Sensing; Multi-Phase; Peak Current-Mode Control; Power Management

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Burli, V. (2017). An Inductor Emulator Approach to Peak Current-mode Control in a 4-Phase Buck Regulator. (Masters Thesis). Arizona State University. Retrieved from http://repository.asu.edu/items/46244

Chicago Manual of Style (16^th Edition):

Burli, Venkatesh. “An Inductor Emulator Approach to Peak Current-mode Control in a 4-Phase Buck Regulator.” 2017. Masters Thesis, Arizona State University. Accessed January 20, 2021. http://repository.asu.edu/items/46244.

MLA Handbook (7^th Edition):

Burli, Venkatesh. “An Inductor Emulator Approach to Peak Current-mode Control in a 4-Phase Buck Regulator.” 2017. Web. 20 Jan 2021.

Vancouver:

Burli V. An Inductor Emulator Approach to Peak Current-mode Control in a 4-Phase Buck Regulator. [Internet] [Masters thesis]. Arizona State University; 2017. [cited 2021 Jan 20]. Available from: http://repository.asu.edu/items/46244.

Council of Science Editors:

Burli V. An Inductor Emulator Approach to Peak Current-mode Control in a 4-Phase Buck Regulator. [Masters Thesis]. Arizona State University; 2017. Available from: http://repository.asu.edu/items/46244

INP Toulouse

14. Le Bolloch, Mathieu. Commandes adaptées pour les convertisseurs statiques multiphases à inductances couplées : Control strategies suitable for parallel converters with coupled inductors.

Degree: Docteur es, Génie électrique, 2010, INP Toulouse

URL: http://www.theses.fr/2010INPT0137

►

L'apparition de convertisseurs multicellulaires parallèles entrelacés et magnétiquement couplés a conduit ces dernières années à améliorer les performances des convertisseurs (en termes de densité de… (more)

▼

L'apparition de convertisseurs multicellulaires parallèles entrelacés et magnétiquement couplés a conduit ces dernières années à améliorer les performances des convertisseurs (en termes de densité de puissance, d'efficacité, de dynamique,...). Le pendant de ces améliorations successives résulte en une nécessité d'équilibrage précis des courants de phase, ce qui entraîne une complexification de la commande des ces convertisseurs. Une première étape de détermination de la fonction de transfert d'une boucle d'équilibrage des courants nous permet de déterminer la nature des correcteurs d'équilibrage de ces courants. Cette étude nous permet d'appréhender des systèmes plus complexes avec différentes topologies de couplage magnétique entre les bras du convertisseur parallèle. Suite à une étude bibliographique mettant en avant le manque de précision des techniques actuelles de mesure des courants de bras, nous proposons une technique d'émulation analogique précise de ces courants ne nécessitant qu'un seul capteur. Deux prototypes ont été réalisés et permettent de valider cette technique. Enfin, face à l'intérêt grandissant que portent les industriels pour des architectures modulaires, deux innovations permettant de s'affranchir d'un circuit spécifique de supervision sont proposées. Dans un premier temps, une technique modulaire d'équilibrage des courants est proposée et validée expérimentalement : elle permet, entre autres, une mesure différentielle précise des courants de bras. Ensuite, une méthode de génération modulaire de porteuses triangulaires auto-alignées est proposée et validée grâce à la réalisation d'une maquette de test. L'association de ces deux techniques nous permet de proposer une architecture entièrement modulaire ne nécessitant plus de circuit de commande superviseur.

Development of interleaved power converters with coupled inductors has enhanced converters performances (better power density, eciency, transient response. . .). Such improvements lead to the necessity of a precise current-sharing in the converter legs, and consequently to much more complex control strategy for those converters. First step is to determine current sharing loop transfer function in order to choose the kind of sharing corrector and calculate its parameters. State-space representation is used to consider any coupling topology. Because ux induced in coupled inductors must be controlled with accuracy, a bibliography study emphasizes the lack of precision in present current-sensing techniques. Then, a precise analogical emulation of currents in every leg, based on only one current sensor, is proposed. Two prototypes have been developed and validate this approach. Finally, because of growing interest of industrial in modular architectures, two innovations which avoid the use of central specic circuit are presented. First, a masterless and modular current sharing technique is proposed and tested : it allows a very precise dierential current measurement and regulation. Then a modular generation of self-aligned triangular carrier for…

Advisors/Committee Members: Cousineau, Marc (thesis director), Meynard, Thierry (thesis director).

Subjects/Keywords: Equilibrage des courants; Convertisseurs parallèles entrelacés; Inductances couplées; Transformateur inter-cellules; Commande modulaire; Current-sharing; Interleaved converters; Coupled inductors; Inter-Cells Transformers (ICT); Modular control strategy

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Le Bolloch, M. (2010). Commandes adaptées pour les convertisseurs statiques multiphases à inductances couplées : Control strategies suitable for parallel converters with coupled inductors. (Doctoral Dissertation). INP Toulouse. Retrieved from http://www.theses.fr/2010INPT0137

Chicago Manual of Style (16^th Edition):

Le Bolloch, Mathieu. “Commandes adaptées pour les convertisseurs statiques multiphases à inductances couplées : Control strategies suitable for parallel converters with coupled inductors.” 2010. Doctoral Dissertation, INP Toulouse. Accessed January 20, 2021. http://www.theses.fr/2010INPT0137.

MLA Handbook (7^th Edition):

Le Bolloch, Mathieu. “Commandes adaptées pour les convertisseurs statiques multiphases à inductances couplées : Control strategies suitable for parallel converters with coupled inductors.” 2010. Web. 20 Jan 2021.

Vancouver:

Le Bolloch M. Commandes adaptées pour les convertisseurs statiques multiphases à inductances couplées : Control strategies suitable for parallel converters with coupled inductors. [Internet] [Doctoral dissertation]. INP Toulouse; 2010. [cited 2021 Jan 20]. Available from: http://www.theses.fr/2010INPT0137.

Council of Science Editors:

Le Bolloch M. Commandes adaptées pour les convertisseurs statiques multiphases à inductances couplées : Control strategies suitable for parallel converters with coupled inductors. [Doctoral Dissertation]. INP Toulouse; 2010. Available from: http://www.theses.fr/2010INPT0137

15. Yang, Gang. Design of a High Efficiency High Power Density DC/DC Converter for Low Voltage Power Supply in Electric and Hybrid Vehicles : Conception d’un Convertisseur à Haut Rendement et Très Forte Puissance Massique pour Alimentation du Réseau de Bord Basse Tension des Véhicules Electriques et Hybrides.

Degree: Docteur es, Energie (SPI), 2014, Supélec

URL: http://www.theses.fr/2014SUPL0011

►

Cette thèse traite de la conception d’un convertisseur DC / DC destiné aux véhicules électriques et hybrides (2,5 kW, 400V/14V, 250kHz). Dérivé de la topologie… (more)

▼

Cette thèse traite de la conception d’un convertisseur DC / DC destiné aux véhicules électriques et hybrides (2,5 kW, 400V/14V, 250kHz). Dérivé de la topologie LLC à résonance, ce convertisseur bénéficie des nombreux avantages propres à cette structure particulière. C’est ainsi que le prototype réalisé présente un rendement très élevé, une densité de puissance très forte avec des perturbations EMI très réduites. La première partie de cette thèse est consacrée à l’analyse théorique du circuit LLC afin de dégager un modèle de conversion et une stratégie de contrôle adaptée à l’application visée. Afin de conserver un rendement important sur une large plage de charge, une structure basée sur la mise en parallèle de deux modules LLC est proposée. Une nouvelle stratégie de contrôle à deux boucles est également proposée pour équilibrer le courant entre les deux modules. La seconde partie de la thèse fait appel à la simulation et à l’expérimentation. Il s’agit de minimiser la masse et l’encombrement tout en maximisant le rendement. Un composant magnétique spécial est conçu puis dimensionné pour intégrer le transformateur et diverses inductances de résonance. Ce convertisseur met également en œuvre un système de redressement synchrone robuste avec une compensation de phase, un module de puissance avec une résistance thermique très faible et un système de refroidissement efficace par air. Le rendement maximal mesuré est 95%. Le rendement demeure supérieur à 94% sur une plage de puissance s’étalant de 500 W à 2 kW. La densité de puissance est 1W/cm3. La CEM du convertisseur est développée dans cette thèse.

In this dissertation, a 2.5kW 400V/14V, 250kHz DC/DC converter prototype is developed targeted for electric vehicle/hybrid vehicle applications. Benefiting from numerous advantages brought by LLC resonant topology, this converter is able to perform high efficiency, high power density and low EMI. A first part of this dissertation is the theoretical analysis of LLC: topology analysis, electrical parameter calculation and control strategy. To arrange high output current, this thesis proposes parallel connected LLC structure with developed novel double loop control to realize an equal current distribution. The second part concerns on the system amelioration and efficiency improvement of developed LLC. A special transformer is dimensioned to integrate all magnetic components, and various types of power losses are quantified based on different realization modes and winding geometries to improve its efficiency. This converter also implements a robust synchronous rectification system with phase compensation, a power semiconductor module, and an air-cooling system. The power conversion performance of this prototype is presented and the developed prototype has a peak efficiency of 95% and efficiency is higher than 94% from 500W to 2kW, with a power density of 1W/cm3. The CEM analysis of this converter is also developed in this thesis.

Advisors/Committee Members: Sadarnac, Daniel (thesis director).

Subjects/Keywords: Convertisseur à résonnance LLC; Commutation douce; Composant magnétique; Augmentation du rendement; Partage de courant; LLC resonant converter; Soft switching; Magnetic components,; Efficiency improvement,; Current sharing; 378.242

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Yang, G. (2014). Design of a High Efficiency High Power Density DC/DC Converter for Low Voltage Power Supply in Electric and Hybrid Vehicles : Conception d’un Convertisseur à Haut Rendement et Très Forte Puissance Massique pour Alimentation du Réseau de Bord Basse Tension des Véhicules Electriques et Hybrides. (Doctoral Dissertation). Supélec. Retrieved from http://www.theses.fr/2014SUPL0011

Chicago Manual of Style (16^th Edition):

Yang, Gang. “Design of a High Efficiency High Power Density DC/DC Converter for Low Voltage Power Supply in Electric and Hybrid Vehicles : Conception d’un Convertisseur à Haut Rendement et Très Forte Puissance Massique pour Alimentation du Réseau de Bord Basse Tension des Véhicules Electriques et Hybrides.” 2014. Doctoral Dissertation, Supélec. Accessed January 20, 2021. http://www.theses.fr/2014SUPL0011.

MLA Handbook (7^th Edition):

Yang, Gang. “Design of a High Efficiency High Power Density DC/DC Converter for Low Voltage Power Supply in Electric and Hybrid Vehicles : Conception d’un Convertisseur à Haut Rendement et Très Forte Puissance Massique pour Alimentation du Réseau de Bord Basse Tension des Véhicules Electriques et Hybrides.” 2014. Web. 20 Jan 2021.

Vancouver:

Yang G. Design of a High Efficiency High Power Density DC/DC Converter for Low Voltage Power Supply in Electric and Hybrid Vehicles : Conception d’un Convertisseur à Haut Rendement et Très Forte Puissance Massique pour Alimentation du Réseau de Bord Basse Tension des Véhicules Electriques et Hybrides. [Internet] [Doctoral dissertation]. Supélec; 2014. [cited 2021 Jan 20]. Available from: http://www.theses.fr/2014SUPL0011.

Council of Science Editors:

Yang G. Design of a High Efficiency High Power Density DC/DC Converter for Low Voltage Power Supply in Electric and Hybrid Vehicles : Conception d’un Convertisseur à Haut Rendement et Très Forte Puissance Massique pour Alimentation du Réseau de Bord Basse Tension des Véhicules Electriques et Hybrides. [Doctoral Dissertation]. Supélec; 2014. Available from: http://www.theses.fr/2014SUPL0011

Virginia Tech

16. Watt, Grace R. Impact of Device Parametric Tolerances on Current Sharing Behavior of a SiC Half-Bridge Power Module.

Degree: MS, Electrical Engineering, 2020, Virginia Tech

URL: http://hdl.handle.net/10919/96559

► This paper describes the design, construction, and testing of advanced power devices for use in electric vehicles. Power devices are necessary to supply electricity to… (more)

Subjects/Keywords: SiC MOSFET; power module packaging; flexible PCB; current sharing; symmetrical direct bonded copper (DBC) layout; diode-less module; multi-chip module; device parametric tolerances; package parasitics; vertical GaN

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Watt, G. R. (2020). Impact of Device Parametric Tolerances on Current Sharing Behavior of a SiC Half-Bridge Power Module. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/96559

Chicago Manual of Style (16^th Edition):

Watt, Grace R. “Impact of Device Parametric Tolerances on Current Sharing Behavior of a SiC Half-Bridge Power Module.” 2020. Masters Thesis, Virginia Tech. Accessed January 20, 2021. http://hdl.handle.net/10919/96559.

MLA Handbook (7^th Edition):

Watt, Grace R. “Impact of Device Parametric Tolerances on Current Sharing Behavior of a SiC Half-Bridge Power Module.” 2020. Web. 20 Jan 2021.

Vancouver:

Watt GR. Impact of Device Parametric Tolerances on Current Sharing Behavior of a SiC Half-Bridge Power Module. [Internet] [Masters thesis]. Virginia Tech; 2020. [cited 2021 Jan 20]. Available from: http://hdl.handle.net/10919/96559.

Council of Science Editors:

Watt GR. Impact of Device Parametric Tolerances on Current Sharing Behavior of a SiC Half-Bridge Power Module. [Masters Thesis]. Virginia Tech; 2020. Available from: http://hdl.handle.net/10919/96559

17. Ivan Nunes Santos. Uma contribuição à avaliação de desempenho dos principais métodos para a atribuição de responsabilidades sobre as distorções harmônicas.

Degree: 2007, Federal University of Uberlândia

URL: http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1059

►

O tema qualidade da energia elétrica contempla aspectos diversos relativos à conformidade do produto energia elétrica, em especial, à tensão. Dentre os assuntos que são… (more)

▼

O tema qualidade da energia elétrica contempla aspectos diversos relativos à conformidade do produto energia elétrica, em especial, à tensão. Dentre os assuntos que são tratados sob tal designação está a questão das distorções harmônicas, as quais na atualidade têm aumentado consideravelmente nos mais diversos pontos constituintes dos sistemas elétricos. Por isso, órgãos reguladores, concessionárias e mesmo consumidores têm mostrado uma crescente preocupação acerca dos níveis atingidos por este indicador da qualidade do fornecimento elétrico. Devido ao caráter nocivo destes distúrbios, normas e recomendações internacionais e nacionais têm procurado estabelecer limites para as distorções. Estes documentos, de um modo global, primam pela definição de valores de referência para os indicadores das distorções totais e individuais, sem, todavia, entrar no mérito da origem das mesmas. Nestes termos, uma vez constatada uma violação dos limites estabelecidos e definida a necessidade da implementação de uma sistemática de mitigação dos efeitos, surge a questão da responsabilidade financeira associada ao processo a ser implementado. Inserido neste contexto, situa-se o tema compartilhamento de responsabilidade, o qual consiste no cerne desta dissertação. Desta forma, este trabalho encontra-se direcionado a sintetizar o estado da arte sobre o tema, considerando, acima de tudo, as principais propostas de compartilhamento encontradas na literatura, quais sejam: Método da Potência Harmônica, Método da Corrente Conforme e Não-conforme e Método da Superposição. A partir destes, utilizando-se procedimentos experimentais e computacionais, procede-se à avaliação e análise crítica dos procedimentos sugeridos, destacando suas potencialidades e limitações.

The subject power quality contemplates diverse aspects relative to the conformity of the product electric energy, in special, the voltage. Amongst the subjects that are treated under such assignment, it is the question of the harmonic distortions, which in the present time have increased considerately in the most distinct constituent points of the electrical systems. Therefore, regulating agencies, concessionaires and consumers have shown an increasing concern on the reached levels for this pointer of the quality of the electric supply. For the harmful character of these riots, international and national norms and recommendations have looked for to establish limits for the distortions. These documents, in a general way, prime for the definition of values of reference for the pointers of the total and individual distortions, without, however, entering in the merit of the origin of the same ones. In these terms, a time evidenced a breaking of the established limits and defined the necessity of the implementation of a systematic of mitigating of the effect, appears the question of the financial responsibility associated to the process to be implemented. Inserted in this context, the subject is placed "sharing of responsibility", which consists of center of this work. Thus, this work meets…

Advisors/Committee Members: Milton Itsuo Samesima, José Carlos de Oliveira, Kleiber David Rodrigues, Marco Aurélio Gonçalves de Oliveira.

Subjects/Keywords: Qualidade da energia elétrica; Harmônicos; Compartilhamento de responsabilidade; Potência harmônica; Corrente conforme; Corrente não-conforme; Princípio da superposição; ENGENHARIA ELETRICA; Energia elétrica - Qualidade; Power quality; Harmonic; Sharing of responsibility; Harmonic power; Current conforming; Current non-conforming; Principle of the overlapping

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Santos, I. N. (2007). Uma contribuição à avaliação de desempenho dos principais métodos para a atribuição de responsabilidades sobre as distorções harmônicas. (Thesis). Federal University of Uberlândia. Retrieved from http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1059

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Santos, Ivan Nunes. “Uma contribuição à avaliação de desempenho dos principais métodos para a atribuição de responsabilidades sobre as distorções harmônicas.” 2007. Thesis, Federal University of Uberlândia. Accessed January 20, 2021. http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1059.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Santos, Ivan Nunes. “Uma contribuição à avaliação de desempenho dos principais métodos para a atribuição de responsabilidades sobre as distorções harmônicas.” 2007. Web. 20 Jan 2021.

Vancouver:

Santos IN. Uma contribuição à avaliação de desempenho dos principais métodos para a atribuição de responsabilidades sobre as distorções harmônicas. [Internet] [Thesis]. Federal University of Uberlândia; 2007. [cited 2021 Jan 20]. Available from: http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1059.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Santos IN. Uma contribuição à avaliação de desempenho dos principais métodos para a atribuição de responsabilidades sobre as distorções harmônicas. [Thesis]. Federal University of Uberlândia; 2007. Available from: http://www.bdtd.ufu.br//tde_busca/arquivo.php?codArquivo=1059

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

18. RAVINDER PAL SINGH. Investigations into design and control of power electronic systems for future microprocessor power supplies.

Degree: 2010, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/23766

Subjects/Keywords: Voltage Regulator Modules (VRMs); Current Sensing; Current Sharing; Interleaved Converters; Digital Pulse Width Modulator(DPWM); Slew Rate Improvement

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

SINGH, R. P. (2010). Investigations into design and control of power electronic systems for future microprocessor power supplies. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/23766

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

SINGH, RAVINDER PAL. “Investigations into design and control of power electronic systems for future microprocessor power supplies.” 2010. Thesis, National University of Singapore. Accessed January 20, 2021. http://scholarbank.nus.edu.sg/handle/10635/23766.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

SINGH, RAVINDER PAL. “Investigations into design and control of power electronic systems for future microprocessor power supplies.” 2010. Web. 20 Jan 2021.

Vancouver:

SINGH RP. Investigations into design and control of power electronic systems for future microprocessor power supplies. [Internet] [Thesis]. National University of Singapore; 2010. [cited 2021 Jan 20]. Available from: http://scholarbank.nus.edu.sg/handle/10635/23766.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

SINGH RP. Investigations into design and control of power electronic systems for future microprocessor power supplies. [Thesis]. National University of Singapore; 2010. Available from: http://scholarbank.nus.edu.sg/handle/10635/23766

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Central Florida

19. Yao, Liangbin. High Current Density Low Voltage Isolated Dc-dc Converterswith Fast Transient Response.

Degree: 2007, University of Central Florida

URL: https://stars.library.ucf.edu/etd/3421

► With the rapid development of microprocessor and semiconductor technology, industry continues to update the requirements for power supplies. For telecommunication and computing system applications, power… (more)

Subjects/Keywords: dc-dc converter; power density; current density; low voltage; high current; high efficiency; half bridge; current doubler; digital control; current sharing; current tripler; rectification; transient response; Electrical and Computer Engineering; Electrical and Electronics; Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Yao, L. (2007). High Current Density Low Voltage Isolated Dc-dc Converterswith Fast Transient Response. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/3421

Chicago Manual of Style (16^th Edition):

Yao, Liangbin. “High Current Density Low Voltage Isolated Dc-dc Converterswith Fast Transient Response.” 2007. Doctoral Dissertation, University of Central Florida. Accessed January 20, 2021. https://stars.library.ucf.edu/etd/3421.

MLA Handbook (7^th Edition):

Yao, Liangbin. “High Current Density Low Voltage Isolated Dc-dc Converterswith Fast Transient Response.” 2007. Web. 20 Jan 2021.

Vancouver:

Yao L. High Current Density Low Voltage Isolated Dc-dc Converterswith Fast Transient Response. [Internet] [Doctoral dissertation]. University of Central Florida; 2007. [cited 2021 Jan 20]. Available from: https://stars.library.ucf.edu/etd/3421.

Council of Science Editors:

Yao L. High Current Density Low Voltage Isolated Dc-dc Converterswith Fast Transient Response. [Doctoral Dissertation]. University of Central Florida; 2007. Available from: https://stars.library.ucf.edu/etd/3421

Virginia Tech

20. Ye, Zhihong. Modeling and Control of Parallel Three-Phase PWM Converters.

Degree: PhD, Electrical and Computer Engineering, 2000, Virginia Tech

URL: http://hdl.handle.net/10919/29476

► This dissertation studies modeling and control issues of parallel three-phase pulse-width modulated (PWM) converters. The converters include three-phase boost rectifiers, voltage source inverters, buck rectifiers… (more)

▼ This dissertation studies modeling and control issues of parallel three-phase pulse-width modulated (PWM) converters. The converters include three-phase boost rectifiers, voltage source inverters, buck rectifiers and current source inverters. The averaging of the parallel converters is performed based on a generic functional switching unit, which is called a phase leg in boost rectifiers and voltage source inverters, and a rail arm in buck rectifiers and current source inverters. Based on phase-leg and rail-arm averaging, the developed models are not only equivalent to the conventional three-phase converter models that are based on phase-to-phase averaging, but they also preserve common-mode information, which is critical in the analysis of the parallel converters. The models reveal such parallel dynamics as reactive power circulation and small-signal interaction. A unique feature of the parallel three-phase converters is a zero-sequence circulating current. This work proposes a novel zero-sequence control concept that uses variable zero-vectors in the space-vector modulation (SVM) of the converters. The control can be implemented within an individual converter and is independent from the other control loops for the converter. Therefore, it greatly facilitates the design and expansion of a parallel system. Proper operation of the parallel converters requires an explicit load-sharing mechanism. In order to have a modular design, a droop method is recommended. Traditionally, however, a droop method has to compromise between voltage regulation and load sharing. After parametric analysis, a novel droop method using a gain-scheduling technique is proposed. The numeric analysis shows that the proposed droop method can achieve both good voltage regulation and good load sharing. An interleaving technique is often used in parallel converter systems in order to reduce current ripples. Because of its symmetrical circuit structure, the parallel three-phase converter system can reduce both differential-mode and common-mode noise with a center-aligned symmetrical SVM. Based on the concept that a symmetrical circuit can reduce common-mode dv/dt noise, a conventional three-phase, four-leg inverter is modified so that its fourth leg is symmetrical to the other three legs. The common-mode dv/dt noise can be practically eliminated with a new modulation strategy. Meanwhile, with a modified control design, the new four-leg inverter still can handle low-frequency common-mode components that occur due to unbalanced and nonlinear load. Advisors/Committee Members: Boroyevich, Dushan (committeechair), Lai, Jason (committee member), Chen, Dan Y. (committee member), Lee, Fred C. (committee member), Nayfeh, Ali H. (committee member).

Subjects/Keywords: circulating current; common-mode noise; multi-phase converter; four-leg converter; PWM converters; zero-sequence; current-bidirectional; current-unidirectional; load sharing; parallel; three-phase

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ye, Z. (2000). Modeling and Control of Parallel Three-Phase PWM Converters. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/29476

Chicago Manual of Style (16^th Edition):

Ye, Zhihong. “Modeling and Control of Parallel Three-Phase PWM Converters.” 2000. Doctoral Dissertation, Virginia Tech. Accessed January 20, 2021. http://hdl.handle.net/10919/29476.

MLA Handbook (7^th Edition):

Ye, Zhihong. “Modeling and Control of Parallel Three-Phase PWM Converters.” 2000. Web. 20 Jan 2021.

Vancouver:

Ye Z. Modeling and Control of Parallel Three-Phase PWM Converters. [Internet] [Doctoral dissertation]. Virginia Tech; 2000. [cited 2021 Jan 20]. Available from: http://hdl.handle.net/10919/29476.

Council of Science Editors:

Ye Z. Modeling and Control of Parallel Three-Phase PWM Converters. [Doctoral Dissertation]. Virginia Tech; 2000. Available from: http://hdl.handle.net/10919/29476

Queensland University of Technology

21. Nami, Alireza. A new multilevel converter configuration for high power and high quality applications.

Degree: 2010, Queensland University of Technology

URL: https://eprints.qut.edu.au/33216/

► The Queensland University of Technology (QUT) allows the presentation of theses for the Degree of Doctor of Philosophy in the format of published or submitted… (more)

▼ The Queensland University of Technology (QUT) allows the presentation of theses for the Degree of Doctor of Philosophy in the format of published or submitted papers, where such papers have been published, accepted or submitted during the period of candidature. This thesis is composed of ten published /submitted papers and book chapters of which nine have been published and one is under review. This project is financially supported by an Australian Research Council (ARC) Discovery Grant with the aim of investigating multilevel topologies for high quality and high power applications, with specific emphasis on renewable energy systems. The rapid evolution of renewable energy within the last several years has resulted in the design of efficient power converters suitable for medium and high-power applications such as wind turbine and photovoltaic (PV) systems. Today, the industrial trend is moving away from heavy and bulky passive components to power converter systems that use more and more semiconductor elements controlled by powerful processor systems. However, it is hard to connect the traditional converters to the high and medium voltage grids, as a single power switch cannot stand at high voltage. For these reasons, a new family of multilevel inverters has appeared as a solution for working with higher voltage levels. Besides this important feature, multilevel converters have the capability to generate stepped waveforms. Consequently, in comparison with conventional two-level inverters, they present lower switching losses, lower voltage stress across loads, lower electromagnetic interference (EMI) and higher quality output waveforms. These properties enable the connection of renewable energy sources directly to the grid without using expensive, bulky, heavy line transformers. Additionally, they minimize the size of the passive filter and increase the durability of electrical devices. However, multilevel converters have only been utilised in very particular applications, mainly due to the structural limitations, high cost and complexity of the multilevel converter system and control. New developments in the fields of power semiconductor switches and processors will favor the multilevel converters for many other fields of application. The main application for the multilevel converter presented in this work is the front-end power converter in renewable energy systems. Diode-clamped and cascade converters are the most common type of multilevel converters widely used in different renewable energy system applications. However, some drawbacks – such as capacitor voltage imbalance, number of components, and complexity of the control system – still exist, and these are investigated in the framework of this thesis. Various simulations using software simulation tools are undertaken and are used to study different cases. The feasibility of the developments is underlined with a series of experimental results. This thesis is divided into two main sections. The first section focuses on solving the capacitor voltage imbalance for a…

Subjects/Keywords: adjacent switching vectors, asymmetrical multilevel converter, asymmetrical diode-clamped converter, asymmetrical cascade converter, capacitor voltage imbalance, cascade converter, cross voltage control, current loop, diode-clamped converter; DC link capacitors, electromagnetic interference (EMI), hybrid cascade converter, hysteresis current control, H-bridge inverter, micro controller, multilevel converter, multi-output boost converter, multi-output DC-DC converter, over voltage, photovoltaic; planar busbar, predictive current control, pulse width modulation (PWM), renewable energy systems, stray inductance, switching components, switching losses, voltage stress, voltage sharing converter, wind turbine

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APA (6^th Edition):

Nami, A. (2010). A new multilevel converter configuration for high power and high quality applications. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/33216/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nami, Alireza. “A new multilevel converter configuration for high power and high quality applications.” 2010. Thesis, Queensland University of Technology. Accessed January 20, 2021. https://eprints.qut.edu.au/33216/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nami, Alireza. “A new multilevel converter configuration for high power and high quality applications.” 2010. Web. 20 Jan 2021.

Vancouver:

Nami A. A new multilevel converter configuration for high power and high quality applications. [Internet] [Thesis]. Queensland University of Technology; 2010. [cited 2021 Jan 20]. Available from: https://eprints.qut.edu.au/33216/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nami A. A new multilevel converter configuration for high power and high quality applications. [Thesis]. Queensland University of Technology; 2010. Available from: https://eprints.qut.edu.au/33216/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

22. Ovalle Villamil , Andres Antonio. Application of Instantaneous Power Theory to Decentralized control of Voltage Source Converters in Microgrids .

Degree: 2013, Universidad de los Andes

URL: http://documentodegrado.uniandes.edu.co/documentos/200714378_fecha_2013_07_05_hora_08_16_57_parte_1.pdf

► Se propone una nueva estrategia para controlar microredes con alta penetración de "Voltage Source Converters" (VSC) y operando en modo autónomo. La estrategia es basada… (more)

Subjects/Keywords: Three-level three-phase inverter; instantaneous power theory; hysteresis current controller; power sharing; microgrid.

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APA (6^th Edition):

Ovalle Villamil , A. A. (2013). Application of Instantaneous Power Theory to Decentralized control of Voltage Source Converters in Microgrids . (Thesis). Universidad de los Andes. Retrieved from http://documentodegrado.uniandes.edu.co/documentos/200714378_fecha_2013_07_05_hora_08_16_57_parte_1.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ovalle Villamil , Andres Antonio. “Application of Instantaneous Power Theory to Decentralized control of Voltage Source Converters in Microgrids .” 2013. Thesis, Universidad de los Andes. Accessed January 20, 2021. http://documentodegrado.uniandes.edu.co/documentos/200714378_fecha_2013_07_05_hora_08_16_57_parte_1.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ovalle Villamil , Andres Antonio. “Application of Instantaneous Power Theory to Decentralized control of Voltage Source Converters in Microgrids .” 2013. Web. 20 Jan 2021.

Vancouver:

Ovalle Villamil AA. Application of Instantaneous Power Theory to Decentralized control of Voltage Source Converters in Microgrids . [Internet] [Thesis]. Universidad de los Andes; 2013. [cited 2021 Jan 20]. Available from: http://documentodegrado.uniandes.edu.co/documentos/200714378_fecha_2013_07_05_hora_08_16_57_parte_1.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ovalle Villamil AA. Application of Instantaneous Power Theory to Decentralized control of Voltage Source Converters in Microgrids . [Thesis]. Universidad de los Andes; 2013. Available from: http://documentodegrado.uniandes.edu.co/documentos/200714378_fecha_2013_07_05_hora_08_16_57_parte_1.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

23. LIM PEI PEI. Series connection of multiple MOSFETs using ZCZV commutation.

Degree: 2004, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/13725

Subjects/Keywords: Series connection; Zero Current Zero Voltage (ZCZV); commutation cell; PWM; DC-DC boost converter and equal voltage sharing.

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APA (6^th Edition):

PEI, L. P. (2004). Series connection of multiple MOSFETs using ZCZV commutation. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/13725

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

PEI, LIM PEI. “Series connection of multiple MOSFETs using ZCZV commutation.” 2004. Thesis, National University of Singapore. Accessed January 20, 2021. http://scholarbank.nus.edu.sg/handle/10635/13725.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

PEI, LIM PEI. “Series connection of multiple MOSFETs using ZCZV commutation.” 2004. Web. 20 Jan 2021.

Vancouver:

PEI LP. Series connection of multiple MOSFETs using ZCZV commutation. [Internet] [Thesis]. National University of Singapore; 2004. [cited 2021 Jan 20]. Available from: http://scholarbank.nus.edu.sg/handle/10635/13725.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

PEI LP. Series connection of multiple MOSFETs using ZCZV commutation. [Thesis]. National University of Singapore; 2004. Available from: http://scholarbank.nus.edu.sg/handle/10635/13725

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Arizona State University

24. Roy, Jinia. High Gain DC-DC and Active Power Decoupling Techniques for Photovoltaic Inverters.

Degree: Electrical Engineering, 2017, Arizona State University

URL: http://repository.asu.edu/items/46225

Subjects/Keywords: Electrical engineering; Active power decoupling; High gain boost; PV transformerless inverter; Sensor-less current sharing; Switched capacitor; Wide bandgap based inverter

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Roy, J. (2017). High Gain DC-DC and Active Power Decoupling Techniques for Photovoltaic Inverters. (Doctoral Dissertation). Arizona State University. Retrieved from http://repository.asu.edu/items/46225

Chicago Manual of Style (16^th Edition):

Roy, Jinia. “High Gain DC-DC and Active Power Decoupling Techniques for Photovoltaic Inverters.” 2017. Doctoral Dissertation, Arizona State University. Accessed January 20, 2021. http://repository.asu.edu/items/46225.

MLA Handbook (7^th Edition):

Roy, Jinia. “High Gain DC-DC and Active Power Decoupling Techniques for Photovoltaic Inverters.” 2017. Web. 20 Jan 2021.

Vancouver:

Roy J. High Gain DC-DC and Active Power Decoupling Techniques for Photovoltaic Inverters. [Internet] [Doctoral dissertation]. Arizona State University; 2017. [cited 2021 Jan 20]. Available from: http://repository.asu.edu/items/46225.

Council of Science Editors:

Roy J. High Gain DC-DC and Active Power Decoupling Techniques for Photovoltaic Inverters. [Doctoral Dissertation]. Arizona State University; 2017. Available from: http://repository.asu.edu/items/46225

University of Central Florida

25. Al-Atrash, Hussam. Analysis And Design Of A Modular Solar-fed Fault-tolerant Power System With Maximum Power Point Tracking.

Degree: 2005, University of Central Florida

URL: https://stars.library.ucf.edu/etd/272

► Solar power is becoming ever more popular in a variety of applications. It is particularly attractive because of its abundance, renewability, and environment friendliness. Solar… (more)

Subjects/Keywords: Maximum Power Point Tracking; Current Sharing; Digital Control; Electrical and Computer Engineering; Electrical and Electronics; Engineering

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APA (6^th Edition):

Al-Atrash, H. (2005). Analysis And Design Of A Modular Solar-fed Fault-tolerant Power System With Maximum Power Point Tracking. (Masters Thesis). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/272

Chicago Manual of Style (16^th Edition):

Al-Atrash, Hussam. “Analysis And Design Of A Modular Solar-fed Fault-tolerant Power System With Maximum Power Point Tracking.” 2005. Masters Thesis, University of Central Florida. Accessed January 20, 2021. https://stars.library.ucf.edu/etd/272.

MLA Handbook (7^th Edition):

Al-Atrash, Hussam. “Analysis And Design Of A Modular Solar-fed Fault-tolerant Power System With Maximum Power Point Tracking.” 2005. Web. 20 Jan 2021.

Vancouver:

Al-Atrash H. Analysis And Design Of A Modular Solar-fed Fault-tolerant Power System With Maximum Power Point Tracking. [Internet] [Masters thesis]. University of Central Florida; 2005. [cited 2021 Jan 20]. Available from: https://stars.library.ucf.edu/etd/272.

Council of Science Editors:

Al-Atrash H. Analysis And Design Of A Modular Solar-fed Fault-tolerant Power System With Maximum Power Point Tracking. [Masters Thesis]. University of Central Florida; 2005. Available from: https://stars.library.ucf.edu/etd/272

Indian Institute of Science

26. Mirzaei, Rahmatollah. Soft Switched Multi-Phase Tapped-Boost Converter And Its Control.

Degree: PhD, Faculty of Engineering, 2009, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/582

► Boost dc-to-dc converters have very good source interface properties. The input inductor makes the source current smooth and hence these converters provide very good EMI… (more)

▼ Boost dc-to-dc converters have very good source interface properties. The input inductor makes the source current smooth and hence these converters provide very good EMI performance. On account of this good property, the boost converter is also the preferred converter for off-line UPF rectifiers. One of the issues of concern in these converters is the large size of the storage capacitor on the dc link. The boost converter suffers from the disadvantage of discontinuous current injected to the load. The size of the capacitor is therefore large. Further, the ripple current in the capacitor is as much as the load current; hence the ESR specification of the tank capacitor is quite demanding. This is specially so in the emerging application areas of automotive power conversion, where the input voltage is low (typically 12V) and large voltage boost (4 to 5) are desired. The first part of this thesis suggests multi-phase boost converter to overcome the disadvantages of large size storage capacitor in boost converter. Comparison between the specification of single stage and multi-stages is thoroughly examined. Besides the average small signal analysis of N converters in parallel and obtaining an equivalent second order system are discussed. By paralleling the converters the design of closed loop control is a demanding task. To achieve proper current sharing among the stages using current control method is inevitable. Design and implementation of closed loop control of multi-phase boost converter both in analog and digital is the topic of next part of the thesis. Comparison between these two approaches is presented in this part and it will be shown that digital control is more convenient for such a topology on account of the requirement of synchronization, phase shifted operation, current balancing and other desired functions, which will be discussed later in detail. A new direct digital control method, which is simple and fast, is developed. Two different realizations with DSP controller and FPGA controller are considered. In the last part of the thesis a novel soft switching circuit for boost converter is presented. It provides Zero Voltage Switching (ZVS) for the main switch and Zero Current Switching (ZCS) for the auxiliary switch. The paper presents the idealized analysis giving all the circuit intervals and the equations necessary for the design of such a circuit. The proposed soft switching circuit is particularly suited for the tapped-inductor boost circuit with a minimum number of extra components. Extension of the method to tapped inductor boost converter addresses the application of Zero Voltage Transition (ZVT) to high conversion ratio converters. Extension of the method to multiphase boost converter shows that with less number of auxiliary switches soft switching operation can be achieved for all interleaved switching devices. Several laboratory prototype boost converters have been built to confirm the theoretical results and design methods are matching with both simulation and experimental results. Advisors/Committee Members: Ramanarayanan, V (advisor).

Subjects/Keywords: Electric Converters; Multi-phase Boost Converters; Interleaved Boost Converters; Switching Modes; Multiphase Boost Converter; Power Converters - Current Sharing; Zero Voltage Switching (ZVS); Zero Current Switching (ZCS); Zero Voltage Transition (ZVT); Digital Control; Electrical Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mirzaei, R. (2009). Soft Switched Multi-Phase Tapped-Boost Converter And Its Control. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/582

Chicago Manual of Style (16^th Edition):

Mirzaei, Rahmatollah. “Soft Switched Multi-Phase Tapped-Boost Converter And Its Control.” 2009. Doctoral Dissertation, Indian Institute of Science. Accessed January 20, 2021. http://etd.iisc.ac.in/handle/2005/582.

MLA Handbook (7^th Edition):

Mirzaei, Rahmatollah. “Soft Switched Multi-Phase Tapped-Boost Converter And Its Control.” 2009. Web. 20 Jan 2021.

Vancouver:

Mirzaei R. Soft Switched Multi-Phase Tapped-Boost Converter And Its Control. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2009. [cited 2021 Jan 20]. Available from: http://etd.iisc.ac.in/handle/2005/582.

Council of Science Editors:

Mirzaei R. Soft Switched Multi-Phase Tapped-Boost Converter And Its Control. [Doctoral Dissertation]. Indian Institute of Science; 2009. Available from: http://etd.iisc.ac.in/handle/2005/582

27. Shenoy, Pradeep. Local control of multiple module converters with ratings-based load sharing.

Degree: MS, 1200, 2010, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/16489

► Multiple module dc-dc converters show promise in meeting the increasing demands on ef- ficiency and performance of energy conversion systems. In order to increase reliability,… (more)

Subjects/Keywords: dc-dc converters; multiple module converters; load sharing; local control; ratings-based load sharing; current sharing; distributed systems; multi-agent systems; Input-series output-parallel (ISOP); push-pull converter

…current sharing methods have been explored for modules with outputs in parallel. In order to… …into non-uniform current sharing has been based on supervisory control. Distributed switch… …that uniform load current sharing or uniform load voltage sharing is the goal (depending… …on the configuration). Most research has focused on uniform load current sharing in… …the input or output. There has been some research into non-uniform current sharing for…

10 more images…

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APA (6^th Edition):

Shenoy, P. (2010). Local control of multiple module converters with ratings-based load sharing. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/16489

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shenoy, Pradeep. “Local control of multiple module converters with ratings-based load sharing.” 2010. Thesis, University of Illinois – Urbana-Champaign. Accessed January 20, 2021. http://hdl.handle.net/2142/16489.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shenoy, Pradeep. “Local control of multiple module converters with ratings-based load sharing.” 2010. Web. 20 Jan 2021.

Vancouver:

Shenoy P. Local control of multiple module converters with ratings-based load sharing. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2010. [cited 2021 Jan 20]. Available from: http://hdl.handle.net/2142/16489.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shenoy P. Local control of multiple module converters with ratings-based load sharing. [Thesis]. University of Illinois – Urbana-Champaign; 2010. Available from: http://hdl.handle.net/2142/16489

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

28. Lukic, Zdravko. Design and Practical Implementation of Advanced Reconfigurable Digital Controllers for Low-power Multi-phase DC-DC Converters.

Degree: 2012, University of Toronto

URL: http://hdl.handle.net/1807/33855

►

The main goal of this thesis is to develop practical digital controller architectures for multi-phase dc-dc converters utilized in low power (up to few hundred… (more)

▼

The main goal of this thesis is to develop practical digital controller architectures for multi-phase dc-dc converters utilized in low power (up to few hundred watts) and cost-sensitive applications. The proposed controllers are suitable for on-chip integration while being capable of providing advanced features, such as dynamic efficiency optimization, inductor current estimation, converter component identification, as well as combined dynamic current sharing and fast transient response. The first part of this thesis addresses challenges related to the practical implementation of digital controllers for low-power multi-phase dc-dc converters. As a possible solution, a multi-use high-frequency digital PWM controller IC that can regulate up to four switching converters (either interleaved or standalone) is presented. Due to its configurability, low current consumption (90.25 μA/MHz per phase), fault-tolerant work, and ability to operate at high switching frequencies (programmable, up to 10 MHz), the IC is suitable to control various dc-dc converters. The applications range from dc-dc converters used in miniature battery-powered electronic devices consuming a fraction of watt to multi-phase dedicated supplies for communication systems, consuming hundreds of watts. A controller for multi-phase converters with unequal current sharing is introduced and an efficiency optimization method based on logarithmic current sharing is proposed in the second part. By forcing converters to operate at their peak efficiencies and dynamically adjusting the number of active converter phases based on the output load current, a significant improvement in efficiency over the full range of operation is obtained (up to 25%). The stability and inductor current transition problems related to this mode of operation are also resolved. At last, two reconfigurable digital controller architectures with multi-parameter estimation are introduced. Both controllers eliminate the need for external analog current/temperature sensing circuits by accurately estimating phase inductor currents and identifying critical phase parameters such as equivalent resistances, inductances and output capacitance. A sensorless non-linear, average current-mode controller is introduced to provide fast transient response (under 5 μs), small voltage deviation and dynamic current sharing with multi-phase converters. To equalize the thermal stress of phase components, a conduction loss-based current sharing scheme is proposed and implemented.

PhD

Advisors/Committee Members: Prodic, Aleksandar, Electrical and Computer Engineering.

Subjects/Keywords: digital controller; high-frequency dc-dc converters; switch-mode power supply; digital pulse-width modulator; efficiency optimization; phase shedding; current estimation; thermal management; identification; sensorless average current-mode controller; current sensing; overload protection; fault protection; temperature protection; fast transient response; current-mode control; fault detection; power management; integrated circuit; low-power consumption; low-power applications; dynamic current sharing; 0544

…logarithmic current sharing… …current sharing… …current sharing and uniform current sharing b) logarithmic current sharing and phase… …79 Figure 4.26: The effectivness of the conduction-loss based current sharing scheme… …temperature protection of the converter components and load devices, • proper current sharing…

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APA (6^th Edition):

Lukic, Z. (2012). Design and Practical Implementation of Advanced Reconfigurable Digital Controllers for Low-power Multi-phase DC-DC Converters. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/33855

Chicago Manual of Style (16^th Edition):

Lukic, Zdravko. “Design and Practical Implementation of Advanced Reconfigurable Digital Controllers for Low-power Multi-phase DC-DC Converters.” 2012. Doctoral Dissertation, University of Toronto. Accessed January 20, 2021. http://hdl.handle.net/1807/33855.

MLA Handbook (7^th Edition):

Lukic, Zdravko. “Design and Practical Implementation of Advanced Reconfigurable Digital Controllers for Low-power Multi-phase DC-DC Converters.” 2012. Web. 20 Jan 2021.

Vancouver:

Lukic Z. Design and Practical Implementation of Advanced Reconfigurable Digital Controllers for Low-power Multi-phase DC-DC Converters. [Internet] [Doctoral dissertation]. University of Toronto; 2012. [cited 2021 Jan 20]. Available from: http://hdl.handle.net/1807/33855.

Council of Science Editors:

Lukic Z. Design and Practical Implementation of Advanced Reconfigurable Digital Controllers for Low-power Multi-phase DC-DC Converters. [Doctoral Dissertation]. University of Toronto; 2012. Available from: http://hdl.handle.net/1807/33855

Indian Institute of Science

29. Prakash, Daiva. Design Of 1400W Telecom Power Supply With Wide Range Input AC Voltage.

Degree: MSc Engg, Faculty of Engineering, 2009, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/575

► In the fast growing field of Telecommunications, the back up DC power supply plays a vital role in powering the telecom equipment. This DC power… (more)

▼ In the fast growing field of Telecommunications, the back up DC power supply plays a vital role in powering the telecom equipment. This DC power supply is a combination of AC-DC Rectifier coupled with a battery bank to support the load when AC input is not available. Figures 0.1 and 0.2 show the line diagram of the DC power supply. The power supply is the most critical element in a telecom installation and it should be highly reliable in order to have un-interrupted service. (Fig) Besides reliability, power density and cost are the driving forces behind the success of a power supply in the market. Off late, the reach of telecom in the society is very wide covering remote villages and major metros. Given this environment, the power supply is exposed to extreme input conditions. It is desirable to design the power supply capable of withstanding wide AC input conditions. Another advantage is that the rectifier unit will keep the battery charged so that the battery will have long life. This thesis is aimed at designing a 1400W (56V/25A) telecom power supply, keeping in view of the issues expressed above. The aim is to design a Switched Mode Rectifier (SMR) that tolerate wide input voltage variations (90Vac to 300Vac). In addition, the design covers unity input power factor, high efficiency (> 90%), high power density ( ), parallel operation and low cost ( ). Chapter 1 of this thesis covers the context and motivation of the work. Chapter 2 presents the design issues pertaining to power supplies. The normalized description of the power converters is presented. Such a description enables one to compare several circuit topologies in order to make effective design decisions. In a similar way the effectiveness of the switches and mgnetics are presented to enable design decisions in the output stage of the rectifier. Chapter 3 presents the design of the 1400W telecom power supply, keeping in view of the stated specifications. The performance results of the converter are presented in Chapter 4. All the design goals have been met. The design exercise has also given insights into possible further improvements. Contributions from this work and course of future development work are indicated in the concluding chapter. Advisors/Committee Members: Ramanarayanan, V (advisor), Vijayanand, S (advisor).

Subjects/Keywords: Electric Power System; AC Voltage; Telecommunication Engineering; Alternating Electric Current; Power Converters; Telecom Power Supply; Boost Section Design; DC-DC Converter Design; Buck Converter; Boost Converter; Buck-Boost Converter; Power Density; Load Sharing Test; Electrical Engineering

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APA (6^th Edition):

Prakash, D. (2009). Design Of 1400W Telecom Power Supply With Wide Range Input AC Voltage. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/575

Chicago Manual of Style (16^th Edition):

Prakash, Daiva. “Design Of 1400W Telecom Power Supply With Wide Range Input AC Voltage.” 2009. Masters Thesis, Indian Institute of Science. Accessed January 20, 2021. http://etd.iisc.ac.in/handle/2005/575.

MLA Handbook (7^th Edition):

Prakash, Daiva. “Design Of 1400W Telecom Power Supply With Wide Range Input AC Voltage.” 2009. Web. 20 Jan 2021.

Vancouver:

Prakash D. Design Of 1400W Telecom Power Supply With Wide Range Input AC Voltage. [Internet] [Masters thesis]. Indian Institute of Science; 2009. [cited 2021 Jan 20]. Available from: http://etd.iisc.ac.in/handle/2005/575.

Council of Science Editors:

Prakash D. Design Of 1400W Telecom Power Supply With Wide Range Input AC Voltage. [Masters Thesis]. Indian Institute of Science; 2009. Available from: http://etd.iisc.ac.in/handle/2005/575

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