A Coordinated Optimal Strategy for Voltage and Reactive Power Control with Adaptive Amplitude Limiter Based on Flexible Excitation System

Yuwei Peng, Jiancheng Zhang, Chengxiong Mao, Hongtao Xiong, Tiantian Zhang and Dan Wang
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Yuwei Peng: Department of Power Engineering, School of Electric Science and Engineering, Huazhong University of Science and Technology, Wuhan 430073, China
Jiancheng Zhang: Department of Power Grid Technology, State Grid Zhejiang Electric Power Research Institute, Hangzhou 310007, China
Chengxiong Mao: Department of Power Engineering, School of Electric Science and Engineering, Huazhong University of Science and Technology, Wuhan 430073, China
Hongtao Xiong: Department of Power Grid Technology, State Grid Zhejiang Electric Power Research Institute, Hangzhou 310007, China
Tiantian Zhang: Department of Power Engineering, School of Electric Science and Engineering, Huazhong University of Science and Technology, Wuhan 430073, China
Dan Wang: Department of Power Engineering, School of Electric Science and Engineering, Huazhong University of Science and Technology, Wuhan 430073, China

Energies, 2021, vol. 14, issue 16, 1-13

Abstract: The flexible excitation system (FES) is a kind of novel excitation system with two channels for damping control. Besides the basic functions of traditional excitation systems, flexible excitation systems can provide reactive power support for the terminal voltage, and the large-capacity FES can improve the voltage stability and power-angle stability of synchronous generator units. However, with the increase in system capacity and the complication of control objectives, the difficulty of controller design will be increased. The randomness and fluctuation of new energy resources such as photovoltaic and wind turbines may cause disturbance and fault to the power system, which requires the coordinated control strategy for the FES to achieve stability in voltage and power angle. In this paper, the basic characteristics of FES are analyzed, and the mathematic model of the single machine infinite bus (SMIB) system based on FES is derived. The coordinated control strategy based on decoupling control of stator and rotor is proposed according to the optimal objectives of voltage stability and power-angle stability, and the linear optimal excitation control (LOEC) is adopted with the adaptive amplitude limiter (AAL) determined by fuzzy rules. The MATLAB/Simulink platform is established and the results verify the superiority of the proposed LOEC + AAL control strategy in large disturbance working conditions, which showed better robustness. The proposed coordinated control strategy provides an effective solution for industrial application and performance improvement of FES.

Keywords: synchronous generator; voltage source converter (VSC); linear optimal excitation control; adaptive amplitude limiter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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