基于高压直流换流站站域信息的交流线路距离保护方法

为了解决发生换相失败时基于工频相量的交流线路距离保护将会受到影响而无法可靠判别故障的难题,提出了一种基于高压直流换流站站域信息的交流线路距离保护方法.因为未发生换相失败期间,距离保护可以准确地识别故障位置,所以可以考虑在换相失败期间闭锁距离保护,以避免其受到换相失败的影响.逆变器正常换相时,直流侧电流与交流侧电流基本相等,而换相失败时直流侧电流将远大于交流侧电流,利用此故障特征可对换相失败进行检测.基于换流站站内换相失败信息的检测与共享,可对传统距离保护的性能进行改善.在 PSCAD/EMTDC 仿真环境下建立高压直流输电系统模型,对所提出保护方法的性能进行验证.仿真结果表明,新提出的距离保护...

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Published in电力系统保护与控制 Vol. 47; no. 1; pp. 101 - 107
Main Authors 王增超, 郑俊超, 曾耿晖, 刘玮, 李一泉, 王育学, 文明浩
Format Journal Article
LanguageChinese
Published 广东电网有限责任公司电力调度控制中心, 广东 广州 510600 2019
广东电网有限责任公司RTDS 继电保护仿真重点实验室, 广东 广州 510600%华中科技大学,湖北 武汉,430072
Subjects
distance protection
距离保护
commutation failure
高压直流输电系统
HVDC system
换相失败
站域信息
substation area information
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Abstract 为了解决发生换相失败时基于工频相量的交流线路距离保护将会受到影响而无法可靠判别故障的难题,提出了一种基于高压直流换流站站域信息的交流线路距离保护方法.因为未发生换相失败期间,距离保护可以准确地识别故障位置,所以可以考虑在换相失败期间闭锁距离保护,以避免其受到换相失败的影响.逆变器正常换相时,直流侧电流与交流侧电流基本相等,而换相失败时直流侧电流将远大于交流侧电流,利用此故障特征可对换相失败进行检测.基于换流站站内换相失败信息的检测与共享,可对传统距离保护的性能进行改善.在 PSCAD/EMTDC 仿真环境下建立高压直流输电系统模型,对所提出保护方法的性能进行验证.仿真结果表明,新提出的距离保护可以避免换相失败对其的影响,在交流线路区内、外发生不同类型的故障时均能准确、可靠地判别故障位置.
AbstractList 为了解决发生换相失败时基于工频相量的交流线路距离保护将会受到影响而无法可靠判别故障的难题,提出了一种基于高压直流换流站站域信息的交流线路距离保护方法.因为未发生换相失败期间,距离保护可以准确地识别故障位置,所以可以考虑在换相失败期间闭锁距离保护,以避免其受到换相失败的影响.逆变器正常换相时,直流侧电流与交流侧电流基本相等,而换相失败时直流侧电流将远大于交流侧电流,利用此故障特征可对换相失败进行检测.基于换流站站内换相失败信息的检测与共享,可对传统距离保护的性能进行改善.在 PSCAD/EMTDC 仿真环境下建立高压直流输电系统模型,对所提出保护方法的性能进行验证.仿真结果表明,新提出的距离保护可以避免换相失败对其的影响,在交流线路区内、外发生不同类型的故障时均能准确、可靠地判别故障位置.
Abstract_FL In order to solve the problem that the traditional distance protection for AC transmission lines is influenced by commutation failure, a novel distance protection based on substation area information sharing is proposed in this paper. The distance protection can detect the fault position correctly when commutation failure do not occur. Thus, to avoid the influence of commutation failure, the distance protection can be blocked when the commutation failure is detected. The current at inverter DC side is approximately equal to the current at AC side when the inverter commutates normally, and the DC current will be larger than the AC current when commutation failure occurs, which can be used to recognize the commutation failure. Based on the detection and sharing of commutation failure information, the traditional distance protection can be improved. A HVDC system model is built in PSCAD/EMTDC simulation environment to test the performance of the improved method. Simulation results show that the novel method can detect the internal and external faults correctly when different types of faults occur, avoiding the influence of commutation failure.
Author 郑俊超
曾耿晖
李一泉
文明浩
刘玮
王育学
王增超
AuthorAffiliation 广东电网有限责任公司电力调度控制中心, 广东 广州 510600;广东电网有限责任公司RTDS 继电保护仿真重点实验室, 广东 广州 510600%华中科技大学,湖北 武汉,430072
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Author_FL ZENG Genghui
ZHENG Junchao
LIU Wei
WANG Yuxue
LI Yiquan
WANG Zengchao
WEN Minghao
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DocumentTitle_FL A distance protection method for AC transmission lines based on substation area information in HVDC convertor station
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Keywords distance protection
距离保护
commutation failure
高压直流输电系统
HVDC system
换相失败
站域信息
substation area information
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广东电网有限责任公司RTDS 继电保护仿真重点实验室, 广东 广州 510600%华中科技大学,湖北 武汉,430072
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Title 基于高压直流换流站站域信息的交流线路距离保护方法
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