模块化多电平换流器的新型桥臂故障容错控制方法  

A Novel Bridge Arm Fault Tolerance Control Method for Modular Multilevel Converters

作　　者：赵海 王栋 ZHAO Hai;WANG Dong(Electric Power Research Institute of State Grid Inner Mongolia East Electric Power Co.Ltd.,Hohhot 010000,China)

机构地区：[1]国网内蒙古东部电力有限公司电力科学研究院,呼和浩特010000

出　　处：《河南科学》2023年第9期1266-1273,共8页Henan Science

基　　金：国家电网有限公司科技项目(5100-202213394A-0-0-00)。

摘　　要：模块化多电平换流器(MMC)被广泛应用于中高功率的输配电场景中,相比传统换流器,MMC可以在桥臂故障的情况下保持容错运行,提高了供电可靠性.尽管已经有相当多的关于MMC的容错运行控制方面的研究,但当三相MMC的一个桥臂发生严重故障而必须被旁路时,其控制方法还没有相关研究.为了解决这个问题,提出了一种新型桥臂故障容错控制方法,该方法通过对桥臂环流的直流分量和交流分量进行调节,实现了对除发生严重故障而被旁路桥臂以外的上下桥臂电容电压的独立控制.通过使用MATLAB/SIMULINK对连接到低压电网的三相MMC进行仿真,证实了所提出的容错方法的可行性和有效性.Modular multilevel converters(MMC)are widely used in medium and high power transmission and distribution scenarios.Compared with traditional converters,MMC can maintain fault-tolerant operation in the event of bridge arm faults,which improves the reliability of power supply.Although there have been considerable researches on the fault-tolerant operation and control of MMC,there is no relevant research on the control method when a serious fault occurs in one of the three-phase MMC bridge arms and it must be bypassed.To address this issue,this paper proposes a new fault-tolerant control method for bridge arm faults.This method adjusts the DC and AC components of the circulating current of the bridge arm to achieve independent control of the capacitor voltages of the upper and lower bridge arms,except for those bypassed bridge arms due to severe faults.The feasibility and effectiveness of the proposed fault-tolerant method are verified by simulating a three-phase MMC connected to a low-voltage power grid using MATLAB/SIMULINK.

关 键 词：模块化多电平换流器 桥臂故障容错 电容电压平衡 桥臂环流 

分 类 号：TM46[电气工程—电器]