摘要
基于模块化多电平换流器的高压直流(MMC-HVDC)短路故障穿越是柔性直流输电技术的重要研究内容。针对混合子模块型MMC-HVDC,提出了基于零直流电压控制的直流短路故障穿越策略,其中上、下桥臂独立控制策略能够在故障穿越过程中保证桥臂能量均衡,负压去游离策略大大提高了直流短路电流清除速度。仿真及实验证明了该策略的有效性,对比闭锁型故障穿越策略,该策略具有故障穿越过程中保持子模块均压、不间断MMC无功功率传输以及缩短MMC重启时间等优势。
DC short circuit fault ride is an important part of HVDC research. In this paper, for hybrid modular multilevel converter in HVDC, a zero DC voltage control based DC fault ride through strategy is proposed, independent control strategy of up and down arms is proposed to keep MMC arm energy balance during the fault ride-through process, negative voltage control for deionization reduction is used to increase fault current obliteration speed. Effectiveness of this zero DC voltage control based DC fault ride-through strategy is verified by simulation and experiment. Compared to MMC-blocked DC fault ride-through strategy, zero DC voltage control based DC fault ride-through strategy has the advantages of sub module voltage balance, uninterrupted reactive power supply and rapid system reboot.
作者
尹太元
王跃
段国朝
刘刚
胡四全
Yin Taiyuan;Wang Yue;Duan Guozhao;Liu Gang;Hu Siquan(State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University, Xi’an 710049 China;Xuji Group Corporation, Xuchang 461000 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2019年第A01期343-351,共9页
Transactions of China Electrotechnical Society
基金
国家电网公司科技项目资助(SGZJ0000KXJS1800370)
