电网技术2013，Vol.37Issue(3)：622-628,7.
交流系统不对称时模块化多电平换流器的控制
Control of Modular Multilevel Converter Under Imbalance of AC Power System
摘要
Abstract
During the imbalance of AC power system,the second-order harmonic circulating current,which behaves just like zero-sequence current does,appears inside three-phase modular multilevel converter (MMC),and such a circulating current enters into DC side of MMC and the double frequency fluctuation of DC voltage,current and power will be intensified.To suppress the double frequency fluctuation of DC power,a control strategy for MMC in stationary α-β frame,based on instantaneous power theory and proportional-resonant regulator is designed.This control strategy is composed of two parts,i.e.,AC-loop control and DC-loop control,the former is used to implement the power adjustment between MMC and AC system and the latter is used to regulate the internal performance of MMC,that is,it mainly suppresses the second-order harmonic circulating current inside MMC to make the current in bridge arms close to sinusoidal.To verify the proposed controller,an inexpensive high voltage direct current transmission system,in which a non-controlled rectifier is at one side and MMC at the other side,is built for simulation.Simulation results show that under imbalance of AC power system the proposed control strategy can effectively suppress the second-order harmonic in circulating current as well as the double frequency fluctuation of voltage,current and power at DC side of MMC.关键词
直流输电/模块化多电平换流器/瞬时功率/交流回路/直流回路/比例谐振调节器/不对称Key words
high voltage direct current transmission/modular multilevel converter/ instantaneous power/ AC-loop/DC-loop/ proportional-resonant regulator/ imbalance分类
信息技术与安全科学引用本文复制引用
周月宾,江道灼,郭捷,梁一桥,胡鹏飞,林志勇..交流系统不对称时模块化多电平换流器的控制[J].电网技术,2013,37(3):622-628,7.基金项目
国家863高技术基金项目(2008AA05Z213). （2008AA05Z213）
感谢浙江省重点科技创新团队项目(2010R50004)对本文的资助！ （2010R50004）
Project Supported by the National High Technology Research and Development of China 863 Program(2008AA05Z213). （2008AA05Z213）
