Open Access Theses and Dissertations

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You searched for subject:(Frequency compensator). Showing records 1 – 3 of 3 total matches.

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1. -8948-6216. Study on house-level microgrids and their power electronics.

Degree: MSin Engineering, Electrical and Computer Engineering, 2017, University of Texas – Austin

URL: http://hdl.handle.net/2152/62911 

This thesis introduces the concept of microgrid, and analyzes the capability for Plug-in Electric Vehicles (PHEV) and photovoltaics (PV) to support a residential load during the time when the utility grid has a power outage. A microgrid system model is introduced and simulations have demonstrated the performance of this microgrid in a grid outage. The possible power electronics interfaces in this microgrid configuration is investigated and compared. Several power electronics converters are introduced and simulated to realize different forms of power conversion. The system model of a DC-DC buck converter is formed, and a possible frequency compensator has been designed and simulated for it. This thesis has introduced the feasibility of a house-level microgrid in its theoretical backup performances, hardware implementations and control. Advisors/Committee Members: Baldick, Ross (advisor), Santoso, Surya (committee member).

Subjects/Keywords: Microgrid; PHEV; V2H; Power electronics; Frequency compensator

…45 5.2 Introduction to Frequency Compensation… …46 5.3 Compensator Types… …49 5.3.1 Lead Compensator… …49 5.3.3 Lead-lag Compensator… …56 5.4.2 Lead-lag Compensator Design ....................................................59… 

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

APA (6th Edition):

-8948-6216. (2017). Study on house-level microgrids and their power electronics. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/62911

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16th Edition):

-8948-6216. “Study on house-level microgrids and their power electronics.” 2017. Masters Thesis, University of Texas – Austin. Accessed March 08, 2021. http://hdl.handle.net/2152/62911.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7th Edition):

-8948-6216. “Study on house-level microgrids and their power electronics.” 2017. Web. 08 Mar 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-8948-6216. Study on house-level microgrids and their power electronics. [Internet] [Masters thesis]. University of Texas – Austin; 2017. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/2152/62911.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-8948-6216. Study on house-level microgrids and their power electronics. [Masters Thesis]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/62911

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete


University of Illinois – Chicago

2. Mehrnami, Siamak. Universal High-Frequency-Link Inverter for Renewable/Alternative Energy.

Degree: 2015, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/19563 

This Dissertation introduces new modulation schemes for single-phase differential-mode Ćuk inverter (DMCI) and differential-mode three-phase Ćuk inverter (DTCI) to improve inverter efficiency by reducing its circulating power. The DMCI is a single-stage inverter with low device count. It offers advantages over other topologies because of compactness, higher power density, and reduced cost. It is a promising topology configuration for renewable-/alternative-energy applications encompassing both isolated and non-isolated configurations. The continuous modulation scheme (CMS), which was introduced originally for DMCI, activates all of the modules of the DMCI. The new discontinuous modulation scheme (DMS) deactivates one module in each half line-cycle leading to discontinuous operation of the inverter modules. Chapter 2 outlines the DMS and a mechanism to realize it. The experimental open-loop and closed-loop results of the DMCI using CMS and DMS are provided along with comparisons of their performances. It is shown that, the DMS reduces the circulating power and mitigates the losses of the DMCI, the voltage ratings of the devices of the DMCI are also reduced with the DMS. In contrast, the CMS-based DMCI exhibits wider linearity in its normalized dc-voltage gain and yields reduced harmonic distortion of the output voltage. For DMS, to achieve comparable linearity in normalized dc-voltage gain and distortion, harmonic compensation under closed-loop control is a pathway that has been demonstrated. The DTCI is introduced in Chapter 3. The DTCI has some advantage over other differential-mode and three-phase topologies, including fewer switches, bidirectional power flow capability, and galvanic isolation. It is a promising configuration for renewable-/alternative-energy applications with isolated as well as non-isolated structures. The CMS, which was introduced originally for DTCI, activates all of the three modules of the DTCI. This modulation scheme increases the circulating power in modules and hence increases the inverter power loss. Chapter 3 introduces DMS for DTCI. DMS deactivates one module at a time resulting in a discontinuous operation of DTCI modules. It also outlines DMS and its implementation with a proper control mechanism. The proposed implementation of the DMS is straight forward. The experimental open-loop and closed-loop results of the DTCI using CMS and DMS are provided along with comparisons of their performances. It is shown that, the DMS reduces the circulating power and hence mitigates the losses. The voltage ratings of the DTCI devices also are reduced with the DMS for the same reason. DTCI exhibits a nonlinear voltage-gain with both CMS- and DMS-based modulations. It has been demonstrated that by feed-forwarding the input voltage and incorporating a static linearization method, the harmonic distortion of the DTCI output is considerably reduced. Advisors/Committee Members: Mazumder, Sudip K. (advisor), Liu, Derong (committee member), Cetinkunt, Sabri (committee member), Song, Byeong M. (committee member).

Subjects/Keywords: Continuous Modulation Scheme; Differential-Mode Ćuk Inverter; Harmonic Compensator; High-Frequency Link; Power Electronic Interface; Proportional Resonant; Static Linearization Block; Total Harmonic Distortion

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

APA (6th Edition):

Mehrnami, S. (2015). Universal High-Frequency-Link Inverter for Renewable/Alternative Energy. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/19563

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

Chicago Manual of Style (16th Edition):

Mehrnami, Siamak. “Universal High-Frequency-Link Inverter for Renewable/Alternative Energy.” 2015. Thesis, University of Illinois – Chicago. Accessed March 08, 2021. http://hdl.handle.net/10027/19563.

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

MLA Handbook (7th Edition):

Mehrnami, Siamak. “Universal High-Frequency-Link Inverter for Renewable/Alternative Energy.” 2015. Web. 08 Mar 2021.

Vancouver:

Mehrnami S. Universal High-Frequency-Link Inverter for Renewable/Alternative Energy. [Internet] [Thesis]. University of Illinois – Chicago; 2015. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10027/19563.

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

Council of Science Editors:

Mehrnami S. Universal High-Frequency-Link Inverter for Renewable/Alternative Energy. [Thesis]. University of Illinois – Chicago; 2015. Available from: http://hdl.handle.net/10027/19563

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


Queensland University of Technology

3. Banejad, Mahdi. Identification of damping contribution from power system controllers.

Degree: 2004, Queensland University of Technology

URL: http://eprints.qut.edu.au/15851/ 

With the growth of power system interconnections, the economic drivers encourage the electric companies to load the transmission lines near their limits, therefore it is critical to know those limits well. One important limiting issue is the damping of inter-area oscillation (IAO) between groups of synchronous machines. In this Ph.D. thesis, the contribution of power system components such as load and static var compensators (SVC) that affect the IAO of the power system, are analysed. The original contributions of this thesis are as follows: 1-Identification of eigenvalues and mode shapes of the IAO: In the first contribution of this thesis, the eigenvalues of the IAO are identified using a correlation based method. Then, the mode shape at each identified resonant frequency is determined to show how the synchronous generators swing against each other at the specific resonant frequencies. 2-Load modelling and load contribution to damping: The first part of this contribution lies in identification of the load model using cross-correlation and autocorrelation functions . The second aspect is the quantification of the load contribution to damping and sensitivity of system eigenvalues with respect to the load. 3- SVC contribution to damping: In this contribution the criteria for SVC controller redesign based on complete testing is developed. Then the effect of the SVC reactive power on the measured power is investigated. All of the contributions of this thesis are validated by simulation on test systems. In addition, there are some specific application of the developed methods to real data to find a.) the mode shape of the Australian electricity network, b.) the contribution of the Brisbane feeder load to damping and c.) the effect of the SVC reactive power of the Blackwall substations on the active power supplying Brisbane.

Subjects/Keywords: Power system eigenvalue; load modelling; resonant frequency; inter-machine oscillations; inter-area oscillations; cross-correlation; autocorrelation; damping contribution; sensitivity analysis; static var compensator; synchronous generator; induction motor; rotor angle.

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

APA (6th Edition):

Banejad, M. (2004). Identification of damping contribution from power system controllers. (Thesis). Queensland University of Technology. Retrieved from http://eprints.qut.edu.au/15851/

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

Chicago Manual of Style (16th Edition):

Banejad, Mahdi. “Identification of damping contribution from power system controllers.” 2004. Thesis, Queensland University of Technology. Accessed March 08, 2021. http://eprints.qut.edu.au/15851/.

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

MLA Handbook (7th Edition):

Banejad, Mahdi. “Identification of damping contribution from power system controllers.” 2004. Web. 08 Mar 2021.

Vancouver:

Banejad M. Identification of damping contribution from power system controllers. [Internet] [Thesis]. Queensland University of Technology; 2004. [cited 2021 Mar 08]. Available from: http://eprints.qut.edu.au/15851/.

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

Council of Science Editors:

Banejad M. Identification of damping contribution from power system controllers. [Thesis]. Queensland University of Technology; 2004. Available from: http://eprints.qut.edu.au/15851/

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

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