Research on Circulating Current Suppression Control of Parallel Inverters

Yibiao Fan (), Lixia Tong, Xiaoping Wang, Xiaowei Cai, Zhihe Fu, Junhui Zhou, Shuangmao Huang and Xingkui Mao
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Yibiao Fan: Physics, Mechanical and Electrical Engineering, Longyan University, Longyan 364012, China
Lixia Tong: Institute for Testing of Industrial Products of Jiangxi General Institute of Testing and Certification, Nanchang 330052, China
Xiaoping Wang: College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350011, China
Xiaowei Cai: Physics, Mechanical and Electrical Engineering, Longyan University, Longyan 364012, China
Zhihe Fu: Physics, Mechanical and Electrical Engineering, Longyan University, Longyan 364012, China
Junhui Zhou: College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350011, China
Shuangmao Huang: Tongce Technology Co., Ltd., Xiamen 364000, China
Xingkui Mao: College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350011, China

Energies, 2024, vol. 17, issue 24, 1-18

Abstract: Circulating current suppression can effectively improve the reliability and redundancy of parallel inverter systems. The mechanism and influencing factors of the low- and high-frequency zero-sequence circulating current (ZSCC) are analyzed in this study. Based on a mechanism analysis and the built mathematical model, the composite control strategy of zero-sequence voltage difference (ZSVD) compensation and virtual inductance is proposed to suppress the low- and high-frequency ZSCC. In the composite control strategy, the low-frequency ZCSS (LF-ZCSS) is suppressed by the ZSVD compensation method, and the HF-ZCSS is suppressed by the virtual inductance method. The ZSVD compensation is incorporated into the SVPWM as an input to regulate the modulation and suppress the LF-ZCSS, and virtual inductance is introduced into the current control loop to suppress the HF-ZCSS. A parallel system prototype composed of two 6 kW inverters is constructed. The experiments show that the ZSCC of the parallel system is reduced by 45%, which verifies the effectiveness of the proposed composite control strategy.

Keywords: zero-sequence circulating current; virtual inductance; zero-sequence voltage difference (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: 2024
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