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

Xiaoyi Xu, Wenxi Yao () and Gang Xie
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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

Energies, 2023, vol. 16, issue 12, 1-17

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.

Keywords: power converter system (PCS); LCL filter; PI control; parallel stability; active damping (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: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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