Modeling, simulation, and control design of electro-mechanical dynamics in heterogeneous power systems
Williams, Ethan
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https://hdl.handle.net/2142/124437
Description
Title
Modeling, simulation, and control design of electro-mechanical dynamics in heterogeneous power systems
Author(s)
Williams, Ethan
Issue Date
2024-05-02
Director of Research (if dissertation) or Advisor (if thesis)
Dominguez-Garcia, Alejandro D
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Modeling
Synchronous Generators
Grid-forming Inverters
Microgrids
Control
Simulator
Matlab/simulink
Language
eng
Abstract
In this thesis, a general modeling framework to study power systems with synchronous generators and grid forming inverters with droop control, virtual synchronous machine control, and dispatchable virtual oscillator control is developed. To mitigate model complexity and facilitate analytical understanding, this framework employs reduced-order models that are applicable for electro-mechanical phenomena occurring on time-scales ranging from tenths of seconds to minutes. Along with developing the open-loop model for this framework, different types of closed-loop control are detailed, including an LQR method that can provide augmented primary control and secondary control. Further, a MATLAB/Simulink tool based on this modeling framework is described, a tool that allows for fast development and flexible simulation of heterogeneous power system models. Finally, the tool’s functionality is demonstrated with various numerical experiments. Its ability to simulate open-loop power systems is tested with a custom 4-bus test case and modified IEEE 14-bus and 57-bus test cases. In addition, an approximation technique to decrease computation time while maintaining sufficient accuracy is tested. Lastly, the tool’s ability to simulate closed-loop control is demonstrated on a custom 2-bus test case, comparing conventional secondary control techniques to the proposed LQR method.
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