首页|Fully Decoupled Branch Energy Balancing Control Method for Modular Multilevel Matrix Converter Based on Sequence Circulating Components
Fully Decoupled Branch Energy Balancing Control Method for Modular Multilevel Matrix Converter Based on Sequence Circulating Components
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The modular multilevel matrix converter(M3C)is a potential frequency converter for low-frequency AC transmission.However,capacitor voltage control of high-voltage and large-capacity M3C is more difficult,especially for voltage balancing between branches.To solve this problem,this paper defines se-quence circulating components and theoretically analyzes the in-fluence mechanism of different sequence circulating components on branch capacitor voltage.A fully decoupled branch energy balancing control method based on four groups of sequence circulating components is proposed.This method can control capacitor voltages of nine branches in horizontal,vertical and diagonal directions.Considering influences of both circulating current and voltage,a cross decoupled control is designed to improve control precision.Simulation results are taken from a low-frequency transmission system based on PSCAD/EMTDC,and effectiveness and precision of the proposed branch energy balancing control method are verified in the case of nonuniform parameters and an unbalanced power system.
Branch energy balancing controldecoupled controllow-frequency AC transmissionmodular multilevel matrix converter(M3C)sequence circulating components
Zexin Zhao、Weijiang Chen、Zhichang Yang、Guoliang Zhao、Bin Han、Yunfei Xu、Nianwen Xiang、Shulai Wang
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China Electric Power Research Institute,Beijing 100192,China
State Grid Corporation of China,Beijing 100031,China
State Grid Smart Grid Research Institute,Beijing 102209,China
State Key Laboratory of Advanced Power Transmission Technology,Global Energy Interconnection Research Institute,Beijing 102211,China
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