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Acta Aeronautica et Astronautica Sinica ›› 2024, Vol. 45 ›› Issue (19): 329967.doi: 10.7527/S1000-6893.2024.29967

• Electronics and Electrical Engineering and Control • Previous Articles    

Implementation and comparison of capacitor charge balance control strategies of DC excitation power generation system

Yu WANG(), Zhiyuan LU, Suo WANG, Kai CHEN   

  1. College of Automation,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China
  • Received:2023-12-12 Revised:2024-02-07 Accepted:2024-04-23 Online:2024-04-28 Published:2024-04-25
  • Contact: Yu WANG E-mail:wanghaohao@nuaa.edu.cn
  • Supported by:
    National Natural Science Foundation of China(51977107);Aeronautical Science Foundation of China(2020HKZ0001)

Abstract:

The output voltage stability of the adjustable excitation DC power generation system is maintained by independently regulating the excitation. The output dynamic performance of the system depends on the quality of the control strategy. The traditional voltage Proportional Integral (PI) control is difficult to take into account the dynamic and steady-state performance of the system. In this paper, the capacitor Charge Balance Control (CBC) method is used to improve the dynamic performance of the DC power generation system. According to the different control objectives and control methods, we have classical CBC strategy, voltage closed-loop Optimal PI Control (OPIC) strategy based on the CBC principle, and capacitor energy storage closed-loop Optimal Single Proportional Control (OSPC) strategy. Firstly, the classical CBC principle is discussed, the realization process of OPIC and OSPC is given, and the outer loop coefficient setting method of OPIC and OSPC is derived based on the idea of CBC. Secondly, a comparative analysis of the three control strategies is given. It is pointed out that although the classical CBC can realize the optimal transient recovery process of the system, the secondary adjustment phenomenon in the switching process needs to be compensated. OPIC and OSPC realize the optimal control of the system by dynamically switching the outer loop coefficient; however, due to the tracking lag of the internal excitation loop, OPIC and OSPC can only approach the ideal CBC effect. Finally, the correctness of the proposed control strategy is verified by experiments, and the results show that the proposed control strategy is more beneficial to improve the dynamic performance of the system than the traditional voltage PI control. In addition, OPIC satisfies dynamic and steady-state regulation performance, OSPC has good anti-load disturbance, and the dynamic performance of compensated CBC is the best.

Key words: DC power generation system, capacitive charge balance, capacitive energy control, dynamic performance, PI control, comparison of control strategies

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