改进的MMC子模块电压均衡策略  

Improved MMC Sub-module Voltage Equalizing Strategy

作　　者：肖浩[1] 高桂革[1] 曾宪文[1] 裴泽阳 叶航[1] 

机构地区：[1]上海电机学院电气学院,上海200240

出　　处：《自动化仪表》2015年第8期15-18,共4页Process Automation Instrumentation

摘　　要：在传统子模块电容均压策略下,模块化多电平变流器(MMC)开关器件存在开关频率高、开关损耗大的缺点。对此,提出了一种改进的子模块电容均压策略。在原有电容电压排序法的基础上,通过设定子模块电压最大允许偏差值以及当前桥臂子模块开通数目来决定子模块的开通选择。分析了单纯依靠子模块电压偏差值确定子模块开通信号存在的问题。最后通过Matlab/Simulink软件仿真验证了该策略的有效性。In traditional sub-module capacitor voltage equalizing strategy, the modular multilevel converter （ MMC } exists the defect such as the switching frequency of switching devices is high and the switching losses are high, thus the improved sub-module capacitor voltage equalizing strategy is proposed. On the basis of existing capacitor voltage sequencing method, through setting maximum allowable deviation of the sub- module and the current number of opening bridge arms of sub-module, to decide the opening selection of sub-module. The problems existing in the method that determining sub-module opening signal only depending on the value of sub-module voltage deviation are explained and analyzed. Finally, the effectiveness of this strategy is verified through Matlab/Simulink software simulation.

关 键 词：模块化多电平变流器 最近电平逼近 电压均衡 开关损耗 MATLAB/SIMULINK 

分 类 号：TH89[机械工程—仪器科学与技术] TM502[机械工程—精密仪器及机械]