架空线柔性直流电网的直流短路电流限制研究  

Restriction of DC short circuit current for overhead lines of flexible DC grid

作　　者：孙栩[1] 王华伟[1] 雷霄[1] 赵兵[1] 王姗姗[1] 

机构地区：[1]中国电力科学研究院,北京100192

出　　处：《电力自动化设备》2017年第2期219-223,共5页Electric Power Automation Equipment

摘　　要：建立了±500 kV架空线柔性直流电网的电磁暂态仿真模型,较为详细地计算、分析、比较了极间短路等严重故障下的短路电流与换流站闭锁时间。研究结果表明,合理地配置限流电抗器是限制短路电流、防止多个换流站闭锁的有效手段。研究了限流电抗器的配置方案以及改进的限流措施,使得站外直流线路故障不会造成任何换流站闭锁,满足设计与运行的要求。An electromagnetic transient simulation model of flexible DC grid with ± 500 k V overhead lines is built and the short circuit current and blocking time of converter station are calculated,analyzed and compared in detail for serious pole-to-pole short circuit faults. Results show that the rational configuration of current-limiting inductors is an effective method to restrain the short circuit currents and prevent the blocking of multiple converter stations. The current-limiting inductor configuration schemes and the improved current-limiting measurements are studied to avoid the converter station blocking due to out-station DC line faults,meeting the requirements of design and operation.

关 键 词：架空线 柔性直流电网 短路电流 限流电抗器 换流站 闭锁 

分 类 号：TM713[电气工程—电力系统及自动化]