摘要
随着青海东部电网的逐步加强,750/330 kV电磁环网增多,青海东部330 kV电网的短路电流超标问题愈来愈严重,对青海电网的安全运行提出了挑战。为此,研究了通过电磁解环限制青海东部电网短路电流超标的可行性。采用支路追加法模拟电磁解环和母线分裂,推导了短路电流灵敏度,提高了短路电流的计算速度,提出了青海东部地区750/330 kV电磁环网解环方案:(1)西宁与青山之间330 kV电磁环网解环,选择断开山城—景阳双回330 kV线路;(2)西宁与海东之间330 kV电磁环网解环,采用330 kV母线分段运行,其中2台主变压器供西宁地区,2台主变压器供海东地区;(3)郭隆与官亭之间330 kV电磁环网解环采用断开阿兰—民和双回330 kV线路。短路电流计算结果表明,母线分裂和电磁解环是限制青海东部电网短路电流的有效手段。
With the gradual strengthening of Qinghai power grid, there are more 750/330 kV electromagnetic loop grid, and the problem of short-circuit current of 330 kV power grid is getting more and more serious, which brings challenges to the safe operation of Qinghai power grid. This paper studies the feasibility of limiting the short-circuit current of the eastern Qinghai power grid through the electromagnetic uncoupling, the branching method is used to simulate the electromagnetic division and bus splitting, and the sensitivity of short-circuit current is derived, which improved the calculation speed of short-circuit current. The electromagnetic decoupling scheme of 750/330 kV power grid in eastern Qinghai is proposed:(1) The 330 kV electromagnetic loop grid between Xining and Qingshan was selected to disconnect the 330 kV line from Shancheng to Jingyang;(2) The 330 kV electromagnetic loop grid between Xining and Haidong was carried out by 330 kV bus division with two transformers for Xining area and two transformers for Haidong area;(3) The 330 kV electromagnetic loop grid between Guolong and Guanting uses the disconnection of the Alan-Minhe 330 kV lines. The short-circuit current calculation results show that bus bar splitting and electromagnetic unlooping are effective means to limit the short-circuit current of the eastern Qinghai power grid.
作者
傅旭
李富春
FU Xu;LI Fuchun(Northwest Electric Power Design Institute Co.,Ltd.,China Power Engineering Consulting Group,Xi’an 710075,Shaanxi Province,China)
出处
《分布式能源》
2020年第2期57-62,共6页
Distributed Energy
关键词
短路电流限制
电磁解环
母线分裂
青海电网
short circuit current limitation
electromagnetic division
bus splitting
Qinghai power grid
作者简介
傅旭(1976),男,博士,高级工程师,注册咨询工程师,主要从事电力系统规划分析方面的研究工作,fuxu@nwepdi.com;李富春(1982),男,高级工程师,从事电力系统规划设计研究工作。
