MMC子模块故障运行特性分析与容错控制策略研究  

Operation Characteristics and the Fault-tolerant Control Strategy of Modular Multilevel Converter Under Sub-module Faults

作　　者：吴学智[1,2] 武文[1] 荆龙[1] 李金科[1] 

机构地区：[1]北京交通大学国家能源主动配电网技术研发中心,北京100044 [2]北京电动车辆协同创新中心,北京100044

出　　处：《高电压技术》2016年第10期3083-3091,共9页High Voltage Engineering

基　　金：国家能源局示范项目(NY20150303)~~

摘　　要：随着模块化多电平变流器(MMC)在高压直流输电领域应用的增多,其故障下的容错运行控制问题也显得愈来重要。针对MMC子模块故障下的容错运行问题,以平均开关状态模型为出发点,建立了适用于不同子模块故障类型下稳态特性分析的通用数学模型。基于该模型,对不同子模块故障类型下的运行特性进行了分析与总结,并针对子模块故障下容错运行的环流抑制问题,设计了适用于不同子模块故障类型的通用容错环流抑制器(GFCCS)。最后,以两种不同的子模块故障类型为算例分析背景进行了仿真与实验分析,结果表明了该通环流抑制器设计有效,能够同时实现不同子模块故障类型下的环流抑制。As modular multilevel converters（MMC） are increasingly applied in the field of HVDC, the fault-tolerant control of MMC under sub-module faults becomes more important. In order to solve the problem of the fault-tolerant operation of MMC under sub-module failure, we established general mathematical models based on switching state model for different types of sub-module failure to analyze the steady state characteristics of MMC. Based on this model, operating characteristics under different sub-module fault types were analyzed and summarized. And for the problem of suppression for the circulating current under fault-tolerant operation after sub-module failure, the general fault-tolerate circulating current suppressor（GFCCS） was designed which could be used for different fault types. At last, two different types of sub-module failure were used as the analysis backgrounds to verify the simulation and experiments. The results verify that the GFCCS is effective and can be used for different fault types.

关 键 词：模块化多电平变流器 数学模型 故障特性 子模块 环流 容错控制 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM46