An Integrated Design Approach for LCL-Type Inverter to Improve Its Adaptation in Weak Grid

Chen Zheng, Yajuan Liu, Shuming Liu, Qionglin Li, Shuangyin Dai, Yuzheng Tang, Bo Zhang and Mingxuan Mao
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Chen Zheng: State Grid Henan Electric Power Research Institute, Zhengzhou 450052, China
Yajuan Liu: State Grid Zhengzhou Electric Power Supply Company, Zhengzhou 450052, China
Shuming Liu: State Grid Henan Electric Power Research Institute, Zhengzhou 450052, China
Qionglin Li: State Grid Henan Electric Power Research Institute, Zhengzhou 450052, China
Shuangyin Dai: State Grid Henan Electric Power Research Institute, Zhengzhou 450052, China
Yuzheng Tang: State Grid Henan Electric Power Research Institute, Zhengzhou 450052, China
Bo Zhang: State Grid Henan Electric Power Research Institute, Zhengzhou 450052, China
Mingxuan Mao: State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China

Energies, 2019, vol. 12, issue 13, 1-19

Abstract: To improve the robustness of grid-connected inverter against grid impedance in a weak grid an integrated design method of LCL-filter parameters and controller parameters is proposed. In the method the inherent relation of LCL-filter parameters and controller parameters is taken into consideration to realize their optimized match. A parameter normalization scheme is also developed to facilitate the system stability and robustness analysis. Based on the method all normalization parameters can be designed succinctly according to the required stability and robustness. Additionally, the LCL parameter and controller parameter can be achieved immediately by restoring normalization parameters. The proposed design method can guarantee the inverter stability and robustness simultaneously without needing any compensation network, additional hardware, or the complicated iterative computations which cannot be avoided for the conventional inverter design method. Simulation and experiment results have validated the superiority of the proposed inverter design method.

Keywords: grid-connected inverter; parameters integration design method; weak grid; adaptation (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: 2019
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