电网技术2016，Vol.40Issue(1)：11-18,8.DOI:10.13335/j.1000-3673.pst.2016.01.002
模块化多电平变流器子模块故障容错控制策略
A Fault-Tolerated Control Strategy for Sub-Module Faults of Modular Multilevel Converters
摘要
Abstract
As mounting numbers of modular multilevel converters (MMC) are increasingly applied in field of flexible HVDC,fault-tolerant control becomes more important.To resolve this problem,a fault-tolerant control strategy based on carrier phase shift modulation method is proposed.It compares several existing redundant fault-tolerant control schemes to ensure grid current constant.This method only resects fault sub-module symmetrically in fault phase to reduce number of sub-module (SM) removal.The carrier in fault phase is reconstructed to help avoiding neutral point shift and to ensure main ingredient of circulating current not changed through regulating sub-module capacitor voltage of fault phase,still containing mainly DC and the second harmonic components.This ensures circulating suppressor based on traditional proportional resonant is versatile before and after sub-module fault.So it can ensure grid current quality and reduce design complexity of sub-module fault-tolerant controller.Finally,simulation and experiment results verified feasibility of the proposed scheme.关键词
模块化多电平变流器/子模块/容错控制/环流Key words
modular multilevel converter/sub-module/fault-tolerant control/circulating current分类
信息技术与安全科学引用本文复制引用
武文,吴学智,荆龙,李金科..模块化多电平变流器子模块故障容错控制策略[J].电网技术,2016,40(1):11-18,8.基金项目
国家能源应用技术研究及工程示范项目(NY20150303).Project Supported by Application Technology Research and Engineering Demonstration Program of National Energy (NY20150303). （NY20150303）
