[1]赵创业,卢铁兵,陈 宁,等.直流断路器对张北柔直电网中单极接地过电压的影响分析[J].高压电器,2019,55(09):111-118.[doi:10.13296/j.1001-1609.hva.2019.09.015]
 ZHAO Chuangye,LU Tiebing,CHEN Ning,et al.Analysis on the Influence of DC Circuit Breaker on Single-pole-to-ground Overvoltage in Zhangbei Flexible DC Power Grid[J].High Voltage Apparatus,2019,55(09):111-118.[doi:10.13296/j.1001-1609.hva.2019.09.015]
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直流断路器对张北柔直电网中单极接地过电压的影响分析()
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《高压电器》[ISSN:1001-1609/CN:61-11271/TM]

卷:
第55卷
期数:
2019年09期
页码:
111-118
栏目:
研究与分析
出版日期:
2019-09-10

文章信息/Info

Title:
Analysis on the Influence of DC Circuit Breaker on Single-pole-to-ground Overvoltage in Zhangbei Flexible DC Power Grid
作者:
赵创业 卢铁兵 陈 宁 吴嘉玲
(华北电力大学新能源电力系统国家重点实验室, 北京 102206)
Author(s):
ZHAO Chuangye LU Tiebing CHEN Ning WU Jialing
(North China Electric Power University, State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources,Beijing 102206, China)
关键词:
柔性直流电网 单极接地故障 直流断路器 过电压 避雷器
Keywords:
flexible DC power grid single-pole-to-grounding fault DC circuit breaker overvoltage arrester
DOI:
10.13296/j.1001-1609.hva.2019.09.015
摘要:
张北柔性直流电网工程将首次实现混合式直流断路器的工程示范应用,并采用故障率 更高的架空线作为输电线路,因此故障过电压对整个系统的威胁更加严峻。文中以柔直电网中 直流侧发生单极接地故障为例,研究了含有直流断路器下的单极接地故障暂态特性,并在 PSCAD/EMTDC平台上搭建了柔直电网过电压仿真模型,仿真分析了直流断路器中避雷器限电压 系数γ、转移支路子模块闭锁时间和避雷器投入方式对关键节点和设备上过电压水平的影响。 结果表明:柔性直流换流站的直流母线、换流变阀侧、限流电抗器端间和金属回线过电压随着 γ的增大而增大,避雷器吸收能量随γ取值增大而减小;随着转移支路子模块闭锁时间的增加 ,单极接地过电压有所减小;避雷器依次投入(带有适当的延迟)比避雷器同时投入在限流电 抗器端间产生的过电压大幅减小,而对其他设备的过电压影响不大。研究结果可为柔性直流换 流站绝缘设计和直流断路器工程化应用提供参考。
Abstract:
Zhangbei flexible DC power grid project will realize the engineering demonstration application of hybrid DC circuit breaker for the first time, and use the overhead line with higher failure rate as the transmission line, so the threat of fault overvoltage to the whole system is more serious.This paper takes the single-pole-to-grounding fault on the DC side of the flexible DC power grid as an example. The transient characteristics of single-pole-to-grounding fault with DC circuit breaker are studied. A simulation model of overvoltage of flexible DC power grid is built on PSCAD/EMTDC platform. The effects of the arrester voltage limiting factor, the closing time of the transfer branch submodule and the input mode of the arrester on the overvoltage level of the key nodes and equipment are analyzed by simulation.The results show that: overvoltage of DC bus, AC side of the converter, terminal of current-limiting reactor and metallic return in the converter station of flexible DC grid increases with the increase of γ,and the absorbed energy of arrester decreases with the increase of the value of γ; With the increase of the blocking time of branch module,the overvoltage of single- pole-grounding is reduced; The overvoltage between the terminal of current- limiting reactor produced by the input of surge arrester in sequence (with appropriate delay) is much smaller than that produced by the input of surge arrester at the same time, but have little influence on overvoltage of other equipment.The results can be used as reference for insulation design of flexible DC converter station and engineering application of DC circuit breaker.

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备注/Memo

备注/Memo:
收稿日期:2019-06-24; 修回日期:2019-08-26 基金项目:国家重点研发计划项目(2016YFB0900900)。 Project Supported by National Key R&D Program of China(2016YFB0900900).赵创业(1995—),男,硕士研究生,研究方向为柔性直流系统过电压。 卢铁兵(1970—),男,教授,博士生导师,研究方向为先进输变电技术。 陈 宁(1990—),男,博士研究生,研究方向为柔性直流系统过电压仿真分析。 吴嘉玲(1996—),女,硕士研究生,研究方向为电力系统电磁兼容。
更新日期/Last Update: 2019-09-10