基于残差分析的MMC子模块故障定位

Fault location for sub-modules in modular multilevel converter based on residual analysis

针对采用最近电平逼近调制(NLM)方式的模块化多电平换流器(MMC)系统,提出一种新的子模块故障定位方法。将给定的NLM阶梯波波形作为参考,与MMC输出的故障电压波形进行比较而构成残差,通过残差分析并结合子模块位置信息可以实现故障子模块的快速定位。在MATLAB/Simulink仿真平台中搭建了9电平MMC逆变器系统,仿真结果验证了该故障定位方法的有效性。

This paper presents a new fault locating method for sub-modules in modular multilevel converter(MMC)using nearest level modulation(NLM)mode.The residual errors are achieved according to the comparison of the given NLM step waveforms and the faulty voltage waveforms outputted by MMC.The faulty sub-module can be quickly located through residual analysis and the position information of the sub-modules.A nine-level MMC inverter system is built by using MATLAB/Simulink software and the simulation results verify the effectiveness of the proposed method.