张北柔直电网工程直流线路短路过程中直流过电压分析

发布时间：2018-06-16 04:15

本文选题：柔性直流电网 + 直流断路器　；参考：《中国电机工程学报》2017年12期

【摘要】：为解决目前我国间歇式清洁能源大规模、远距离消纳面临的问题,推动全球能源互联网先进输电技术研发,国家电网公司拟在张北建设±500k V四端柔性直流电网示范工程。当直流线路发生短路故障时,故障侧换流站闭锁,继而直流断路器动作切断故障线路,此时换流器直流输出端口出现直流过电压,该过电压是配备了直流断路器的直流电网所特有的,因为该过电压是直流断路器动作后,导致故障侧换流站输入和输出功率不平衡,未闭锁的换流站通过无故障线路给闭锁换流站子模块电容器充电引起的。该示范工程将实现直流断路器的首次工程应用,调整直流断路器的动作策略将会明显的抑制该直流过电压。该文分别对近送端换流站和近受端换流站直流线路故障引起的直流过电压进行分析,详细描述过电压的机理以及动态过程,并给出相应的措施来抑制直流过电压。
[Abstract]:In order to solve the problem of large-scale and long-distance absorption of intermittent clean energy in China and to promote the research and development of advanced global energy transmission technology, the State Grid Company plans to build 卤500kV four-terminal flexible DC network demonstration project in Zhangbei. When a short circuit fault occurs in the DC line, the fault side converter station is locked, and the DC circuit breaker acts to cut off the fault line. At this time, the DC overvoltage occurs at the DC output port of the converter. The overvoltage is unique to the DC network equipped with DC circuit breakers, because the overvoltage is the result of unbalanced input and output power at the fault side converter station after the DC circuit breaker operates. An unlocked converter station recharges a submodule capacitor of a locked converter station via a fault-free line. This demonstration project will realize the first engineering application of DC circuit breaker, and adjusting the action strategy of DC circuit breaker will obviously restrain the DC overvoltage. This paper analyzes the DC overvoltage caused by the fault of the DC line in the near terminal converter station and the near receiving terminal converter station respectively, describes the mechanism and dynamic process of the overvoltage in detail, and puts forward the corresponding measures to restrain the DC overvoltage.
【作者单位】：中国电力科学研究院;
【基金】：国家电网公司科技项目《±500k V柔性直流电网运行特性与控制技术研究》国家重点研发计划智能电网技术与装备重点专项(2016YFB0900600)~~
【分类号】：TM721.1

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