摘要
模块化多电平换流器型轻型直流输电系统,其拓扑结构中各桥臂级联了大量子模块,系统运行时容易出现可靠性问题。针对桥臂冗余子模块耗尽的情况,基于桥臂能量均衡和最近电平调制提出一种桥臂子模块对称切除及系统运行于不对称状态的控制方法,保证了系统不间断安全稳定运行。最后,利用PSCAD/EMTDC仿真软件搭建了21电平两端有源的模块化多电平换流器型轻型直流输电系统模型。仿真结果验证了所提出的故障容错控制策略的正确性和有效性。
Considering the large amount of sub-modules(SMs)cascaded on the arms in the modular multilevel converter(MMC)based high voltage direct current(HVDC)transmission system,attention is paid to the operation reliability.In order to fully implement the functionalities of MMC,its fault-tolerant operation without redundant SMs is investigated,and a new redundancy protection control strategy based on energy balance and nearest level modulation is proposed when the SMs on the arms are removed symmetrically and the system is in an asymmetric state.The proposed strategy ensures that the converter can operate safely and stably without interruption.Finally,a21-level two-terminal MMCHVDC system is built in PSCAD/EMTDC.Simulation results show that the proposed redundancy protection control strategy is valid and effective.
作者
程莹
杨浩
单佳佳
帅智康
CHENG Ying;YANG Hao;SHAN Jiajia;SHUAI Zhikang(Maintenance Branch,State Grid Hunan Electric Power Company,Changsha 410000,China;College of Electrical and Information Engineering,Hunan University,Changsha 410082,China)
出处
《电力系统及其自动化学报》
CSCD
北大核心
2017年第12期107-113,共7页
Proceedings of the CSU-EPSA
关键词
模块化多电平换流器
冗余控制
子模块
能量均衡
可靠性
modular multilevel converter(MMC)
redundancy control
sub-module(SM)
energy balance
reliability
