中国电机工程学报Issue(15)：3921-3928,8.DOI:10.13334/j.0258-8013.pcsee.2015.15.022
MMC子模块故障下桥臂不对称运行特性分析与故障容错控制
Operation Characteristics of the MMC With Asymmetrical Arms Under Sub-module Faults and the Fault-tolerant Control
摘要
Abstract
ABSTRACT:The operation characteristic of the modular multilevel converter (MMC) with asymmetrical sub-module (SM) numbers of the arms caused by sub-module fault was analyzed. The fault characteristics, including the asymmetrical capacitor voltage of the upper and lower arms, the asymmetrical harmonic loop currents of all orders, the DC current fluctuation, the voltage offset at the DC or AC side, and the asymmetrical DC components of the arm current of the arms were revealed. A loop current suppressing controller with SM fault-tolerant ability was proposed based on the concept of rebalancing the fundamental frequency component of the upper and lower arm voltage. The controller was designed by adding a fundamental frequency resonant controller to the traditional second-order frequency proportional resonant (PR) loop current controller, hence it can solve the series of problems caused by asymmetrical arms. A 2-terminal 201-level MMC-HVDC system was established in PSCAD/EMTDC and the simulation results validated the efficiency of the proposed control strategy.关键词
模块化多电平换流器/子模块故障/故障容错控制/环流抑制Key words
modular multilevel converter (MMC)/sub- module fault/fault-tolerant control/loop current suppressing分类
信息技术与安全科学引用本文复制引用
李探,赵成勇..MMC子模块故障下桥臂不对称运行特性分析与故障容错控制[J].中国电机工程学报,2015,(15):3921-3928,8.基金项目
国家高技术研究发展计划(863计划)主题项目(2013AA050105)；中央高校基本科研业务费专项资金资助(2014XS03)。Project supported by National High Technology Research and Development Program of China (863 Program)(2013AA050105) （863计划）
The Fundamental Research Funds for the Central Universities (2014XS03) （2014XS03）
