摘要
针对某特高压直流工程换流器故障隔离及重启耗时长、停电范围大、造成功率损失等问题,在分析故障机理的基础上,提出了一种优化后的故障隔离及重启策略。优化了换流器保护区域,改进换流器保护区域的连接方式,并增设快速断路器加速故障隔离及重启过程;优化故障隔离及重启策略,利用换流器移相控制策略快速限流,利用快速断路器动作缩小故障隔离范围,避免极隔离、极重启和大规模切机、切负荷的发生。仿真验证表明,优化后的故障隔离及重启策略总耗时低于0.5 s,仅隔离故障换流器,保证了健全部分持续传输功率,显著提升了特高压直流输电的可靠性和经济性。
Aiming at the problems of long-time consumption,large power out-age range,and power loss of the converter fault isolation and restart process in a UHVDC project,an optimized strategy was proposed based on the analysis of the fault mechanism.On the one hand,the converter protection area,as well as the connection mode of the breakers is optimized,and fast circuit breakers are added to speed up the process. On the other hand,the fault isolation and restart strategy is improved. By using the inverter phase shift control to limit the fault current fast,using fast circuit breaker action to narrow the scope of fault isolation,the occurrence of pole isolation,pole restart,and large-scale machine and load shedding is avoided. The simulation verification shows that the optimized fault isolation and restart strategy takes less than 0.5s in total,and only isolates the faulty converter to ensure the continuous power transmission of the sound part,which significantly improves the reliability and economy of UHVDC transmission.
作者
宋海龙
叶冬萌
史磊
谢凡
柴斌
杨松浩
郝治国
SONG Hailong;YE Dongmeng;SHI Lei;XIE Fan;CHAI Bin;YANG Songhao;HAO Zhiguo(Ultra High Voltage Company of State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan 750011,Ningxia,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi'an 710049,Shaanxi,China;State Grid Ningxia Power Co.,Ltd.,Yinchuan 750001,Ningxia,China)
出处
《电网与清洁能源》
北大核心
2022年第8期51-59,共9页
Power System and Clean Energy
基金
国网宁夏电力有限公司科技项目(5229CG20006D)
宁夏回族自治区重点研发计划重点项目(后支持类)(2021BDE931015)。
关键词
特高压
直流输电技术
换流器保护
门控移相
快速断路器
故障隔离
ultra-high voltage
DC transmission technology
converter zone protection
gated phase shifting
fast circuit breakers
fault isolation
