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A Damping Control Strategy to Improve the Stability of Multi-Parallel Grid-Connected PCSs

Author

Listed:
  • Xiaoyi Xu

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

  • Wenxi Yao

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

  • Gang Xie

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract

In this study, to ensure stable operation of multi-parallel PCSs, a damping control strategy is adopted to restrain resonance characteristics of a parallel system, and the stability of the system is analyzed. First, the mathematical model of a single PCS is built, the capacitive current feedback-type active damping control strategy is introduced, and the effect of the damping control strategy on a single PCS under proportional-integral (PI) control is analyzed. Then, under the presence of grid impedance, a single PCS model is established and extended to multi-parallel PCSs, where a single PCS is replaced by a Norton’s equivalent circuit. The active damping method is developed, and Bode diagrams are utilized to verify that it can effectively suppress the resonance spikes of a parallel system. Finally, a simulation model of four PCSs in parallel operation is built on the Simulink platform, and the results support the correctness of the theoretical analysis.

Suggested Citation

  • Xiaoyi Xu & Wenxi Yao & Gang Xie, 2023. "A Damping Control Strategy to Improve the Stability of Multi-Parallel Grid-Connected PCSs," Energies, MDPI, vol. 16(12), pages 1-17, June.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:12:p:4633-:d:1168320
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