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

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University of Houston

1. Zamanian, Fatemeh. Nonlinear Controller Design for Regulating Systems.

Degree: PhD, Mechanical Engineering, University of Houston

Presented in this dissertation is a nonlinear controller synthesis methodology based on the inverse Sinusoidal Input Describing Function (SIDF) for a class of regulating systems. The design goal is to improve regulating performance beyond what is achievable by a linear control for a predicted level of disturbance step size. The controller design is executed using open loop frequency domain information and is applicable when the frequency response of a linear design cannot satisfy the designed open loop gain and phase characteristics. The gain and phase differences between the designed open loop frequency response and that of a linear design is treated as SIDF distortions. The inverse describing function approach is employed to identify an isolated explicit nonlinearity that is associated with obtained gain and phase distortions. For this, a computational solution to the inverse SIDF for a broad class of hysteresis or memoryless explicit nonlinearities is developed. The proposed numerical solution uses gain and phase distortions as a function of input amplitude size to identify the nonlinearity, and does not require a priori knowledge of the nonlinearity in the estimation process. The output from the algorithm is a non-parametric model of the nonlinearity from which a parametric model can be recovered. To illustrate the proposed nonlinear controller design technique, the idle speed control of a V-6 fuel injected engine model subject to an external torque load disturbance is considered. The closed loop performance is validated through simulation and the closed loop stability in the sense of the bounded-input-bounded-output (BIBO) is assessed using Circle Theorem. Advisors/Committee Members: Franchek, Matthew A. (advisor), Grigoriadis, Karolos M. (committee member), Rao, Jagannatha R. (committee member), Song, Gangbing (committee member), Provence, Robert S. (committee member).

Subjects/Keywords: Nonlinear Control; Frequency Domain; Inverse Sinusoidal Input Describing Function; H_∞ Linear Control Synthesis; BIBO Stability; Inverse Sinusoidal Input Describing Function; Gain distortions; Phase distortions; Memoryless Nonlinearities

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

APA (6th Edition):

Zamanian, F. (n.d.). Nonlinear Controller Design for Regulating Systems. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/2830

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Chicago Manual of Style (16th Edition):

Zamanian, Fatemeh. “Nonlinear Controller Design for Regulating Systems.” Doctoral Dissertation, University of Houston. Accessed January 24, 2021. http://hdl.handle.net/10657/2830.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

MLA Handbook (7th Edition):

Zamanian, Fatemeh. “Nonlinear Controller Design for Regulating Systems.” Web. 24 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Zamanian F. Nonlinear Controller Design for Regulating Systems. [Internet] [Doctoral dissertation]. University of Houston; [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10657/2830.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Council of Science Editors:

Zamanian F. Nonlinear Controller Design for Regulating Systems. [Doctoral Dissertation]. University of Houston; Available from: http://hdl.handle.net/10657/2830

Note: this citation may be lacking information needed for this citation format:
No year of publication.


North Carolina State University

2. Li, Minsheng. Nonlinear Behavioral Modeling of Quadrature Modulators and Analysis of Impacts on Wireless Communication Systems.

Degree: PhD, Electrical Engineering, 2008, North Carolina State University

Subjects/Keywords: quadrature modulators; DC offset; nonlinear behavioral modeling; AM-PM; nonlinear distortions; gain/phase imbalance; ACPR; EVM; AM-AM

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

APA (6th Edition):

Li, M. (2008). Nonlinear Behavioral Modeling of Quadrature Modulators and Analysis of Impacts on Wireless Communication Systems. (Doctoral Dissertation). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/5936

Chicago Manual of Style (16th Edition):

Li, Minsheng. “Nonlinear Behavioral Modeling of Quadrature Modulators and Analysis of Impacts on Wireless Communication Systems.” 2008. Doctoral Dissertation, North Carolina State University. Accessed January 24, 2021. http://www.lib.ncsu.edu/resolver/1840.16/5936.

MLA Handbook (7th Edition):

Li, Minsheng. “Nonlinear Behavioral Modeling of Quadrature Modulators and Analysis of Impacts on Wireless Communication Systems.” 2008. Web. 24 Jan 2021.

Vancouver:

Li M. Nonlinear Behavioral Modeling of Quadrature Modulators and Analysis of Impacts on Wireless Communication Systems. [Internet] [Doctoral dissertation]. North Carolina State University; 2008. [cited 2021 Jan 24]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/5936.

Council of Science Editors:

Li M. Nonlinear Behavioral Modeling of Quadrature Modulators and Analysis of Impacts on Wireless Communication Systems. [Doctoral Dissertation]. North Carolina State University; 2008. Available from: http://www.lib.ncsu.edu/resolver/1840.16/5936


Texas A&M University

3. Zhang, Haiyu. Topology and Control for Photovoltaic Microinverters.

Degree: PhD, Electrical Engineering, 2016, Texas A&M University

Motivated by the continuously increasing world energy demands and greenhousegas (GHG) emissions from conventional fossil fuels, renewable energy, especially solar energy is ready to become a significant part of global energy portfolio. The microinverters, as the interface between the photovoltaic (PV) modules and the ac electrical power grid, have become popular due to the potentials to achieve high reliability, improved system flexibility and enhanced electrical safety compared with the string or central inverters. Thanks to the decreasing costs and disruptive enabling technologies, they have rapidly emerged in the global residential and even commercial PV market. This dissertation proposes a two stage isolated PV microinverter comprised of dc-dc converter followed by dc-ac inverter. For the front-end dc-dc converter, the with enhancement gallium nitride filed-effect transistors (eGaN FETs) is used to achieve high voltage gain, soft switching and high frequency operation. To further explore the electrical and thermal characteristics of eGaN FETs, the driving signals of eGaN FETs with appropriate overlap are proposed and implemented to not only optimize the reverse conduction performance of eGaN FETs, but also avoid shoot-through current during dead time in single phase leg structure. To evaluate the cooling requirements in advance to ensure effective heat dissipation with minimized heat sink, a simplified thermal resistor model of eGaN FETs is proposed and verified thorugh both finite element analysis (FEA) and LabVIEW/ Multisim co-simulation. Single phase inverters are inherently subject to the double line frequency ripple power at both ac and dc sides. The general solutions that unify all existing power decoupling techniques is obtained. The component counts, energy utilization and voltage/current ripple of energy storage components, dc voltage utilizations of both main circuit and power decoupling circuit, and the current stresses of power devices in main circuit are derived and investigated. The evaluations on all existing power decoupling techniques for the two stage PV microinverters, are summarized to provide helpful guidance during design. A digitally implemented proportional resonant (PR) and hybrid hysteresis current control with soft switching in the dc-ac inverter of the two stage PV microinverters is proposed to reduced switching losses, optimize zero-crossing distortions and mitigate low frequency harmonics. Advisors/Committee Members: Balog, Robert S (advisor), Enjeti, Prasad (committee member), Bhattacharyya, Shankar P (committee member), Kim, Won-Jong (committee member).

Subjects/Keywords: photovoltaic microinverters; front-end resonant dc-dc converter; high voltage gain; soft switching; eGaN FETs; reverse conduction; loss analysis; thermal study; double line frequency; power decoupling; general solutions; dc-ac inverter; zero voltage switching; zero current switching; frequency analysis; zero-crossing distortions; low frequency harmonics; proportional resonant control; hybrid hysteresis current control

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

APA (6th Edition):

Zhang, H. (2016). Topology and Control for Photovoltaic Microinverters. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/156953

Chicago Manual of Style (16th Edition):

Zhang, Haiyu. “Topology and Control for Photovoltaic Microinverters.” 2016. Doctoral Dissertation, Texas A&M University. Accessed January 24, 2021. http://hdl.handle.net/1969.1/156953.

MLA Handbook (7th Edition):

Zhang, Haiyu. “Topology and Control for Photovoltaic Microinverters.” 2016. Web. 24 Jan 2021.

Vancouver:

Zhang H. Topology and Control for Photovoltaic Microinverters. [Internet] [Doctoral dissertation]. Texas A&M University; 2016. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1969.1/156953.

Council of Science Editors:

Zhang H. Topology and Control for Photovoltaic Microinverters. [Doctoral Dissertation]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/156953

.