A Decoupled Circulating Current Suppressing Strategy For Modular Multilevel Converter

Shukai Mao, Binbin Li, Shuxin Zhang, Dianguo Xu, Jizhong Chen, Xiaoqing Wang
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引用次数: 2

Abstract

Modular multilevel converters (MMC) have an inevitable double-frequency circulating current between phases because of the three-phase parallel structure. This leads to extra power loss of the converter. The traditional circulating current suppression strategy suppresses the double-frequency content by superimposing the circulating current suppression signal into the reference of upper and lower arms. Due to the addition of the suppression signal, the upper-and lower-arm modulation reference waves are distorted. That affects the quality of output waveform on AC voltage. This paper proposes a decoupled circulating current suppressing strategy which suppresses the circulating current without affecting the output waveform on the AC side. Simulation and experiment results show the effectiveness of the proposed strategy.
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模块化多电平变换器的去耦循环电流抑制策略
模块化多电平变换器由于其三相并联结构,不可避免地存在两相间双频循环电流。这将导致转换器的额外功率损失。传统的循环电流抑制策略通过将循环电流抑制信号叠加到上臂和下臂的参考中来抑制双频含量。由于抑制信号的加入,上臂和下臂调制参考波发生了畸变。这影响了交流电压下输出波形的质量。本文提出了一种不影响交流侧输出波形的解耦循环电流抑制策略。仿真和实验结果表明了该策略的有效性。
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