Improved Switching Ripple Suppression Strategy for Multi-Paralleled Grid-Connected Inverters System

The switching operations of inverters in the distributed system inevitably introduce high-frequency harmonics into grid, which may make influences on electrical devices. To address it, this paper proposes a ripple suppression strategy based on active cancellation combined with passive filtering. The...

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Published in2019 10th International Conference on Power Electronics and ECCE Asia (ICPE 2019 - ECCE Asia) pp. 2336 - 2343
Main Authors Cao, Wu, Kang, Haotian, Liu, Kangli, Wang, Shunyu, Zhao, Jianfeng, Ji, Xiaochun, Zhao, Jun
Format Conference Proceeding
LanguageEnglish
Published The Korean Institute of Power Electronics (KIPE) 01.05.2019
Subjects
component-shared
Harmonic analysis
Inverters
LCL filters
Multi-parelleled grid-connected
Passive filters
Power harmonic filters
Power system stability
Switches
switching ripples
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Summary:The switching operations of inverters in the distributed system inevitably introduce high-frequency harmonics into grid, which may make influences on electrical devices. To address it, this paper proposes a ripple suppression strategy based on active cancellation combined with passive filtering. The active cancellation is realized by carrier-phase-shift (CPS) technique and the passive filtering is achieved by filters. Furthermore, two component-shared LCL-type filters improved by traditional LCL filters are studied from the points of resonance and accuracy of grid-injected current. To valid the effectiveness of the proposed strategy, simulations and experimental test are carried out. The results show that the proposed strategy can effectively suppress high-frequency harmonics and two component-shared LCL-type filters can become promising filters for the multi-paralleled grid-connected inverters.
ISSN:2150-6086
DOI:10.23919/ICPE2019-ECCEAsia42246.2019.8796872