于灿平
YU Canping

• 1:国电南京自动化股份有限公司

摘要(Abstract)：

随着跨区特高压直流工程的快速发展,多回特高压直流同送同受的电网格局凸显,受端电网短路故障易造成多回直流同时发生换相失败,危及电网的安全稳定运行。为此,基于单机等面积定则,对比分析了三相永久性故障和单相永久性故障下直流换相失败对送端电网的功率冲击强弱;研究了直流换相失败对送端电网稳定运行的影响机理,并结合电网区域振荡模式分析了多直流同时相继换相失败对功率冲击幅度的作用机制;探讨了单相故障重合闸时间整定优化对送端电网稳定特性的影响。实际电网算例的仿真结果表明,考虑送端电网实际振荡模式适时优化调整受端电网重合闸整定时间,可有效减小多回直流相继换相失败对电网功率冲击的影响。
With the rapid development of cross-regional UHVDC projects, the grid pattern of multiple-circuit UHVDC with the same sending and receiving end has been highlighted. The short-circuit fault in the receiving end power grid can easily cause successive commutation failure at the same time, threatening the safe and stable operation of the power grid. In this paper, based on the single machine equal area criterion, the effects of the UHVDC successive commutation failure caused by the single-phase permanent fault on the stable operation of sending end grid are analyzed. According to the actual regional oscillation mode of the sending end grid, the mechanism of action of power fluctuation under different reclosing time is studied. The optimization of the reclosing time of the single-phase permanent fault, that adapting to the actual situation of the sending end power grid has been discussed and through the simulation verification. The results show that by timely adjusting the reclosing time of the receiving end grid based on the power grid actual oscillation mode can effectively reduce the impact of the power impulses caused by the successive commutation failure of the multiplecircuit UHVDC.

关键词(KeyWords)： 特高压直流;同送同受;换相失败;单相重合闸;整定优化
UHVDC;same sending and receiving;commutation failure;single-phase reclosing;correction and optimization

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 于灿平
YU Canping

DOI: 10.19585/j.zjdl.201905009

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