交直流混联系统对交流电网继电保护影响综述
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摘要
我国交直流混联电网格局已基本形成,但其对交流电网继电保护的影响依旧存在较多难题。重点分析交直流混联电网故障特性及其对交流电网继电保护的影响与对策。对于距离保护,重点分析换相失败时测量阻抗不准等问题;对于方向纵联保护,换相失败时交直流系统出现"竞争",可能导致非故障线路出现暂态功率倒向引起误动而故障线路有可能发生拒动问题。对于差动保护,换相失败可能导致其可靠性降低,同时换相失败或直流偏磁时换流变差动保护也存在不正确动作。文章进一步对现有存在的解决方案进行了总结与研究展望。
The pattern of the AC-DC hybrid power grid has been basically formed in China,but difficulties still remain in the pattern's impacts on the relay protection of the AC power grid. This paper focuses on analyzing the fault features of the AC-DC hybrid power grid and its impacts on the relay protection of the AC power grid as well as necessary counter measures.For distance protection,this paper has highlighted that the measured impedance is not accurate with commutation failure. For directional pilot protection,with commutation failure it is difficult to determine the fault direction,which leads to an inaccurate protection action. For differential relay,commutation failure could reduce the reliability of protection,and the DC bias causes an inaccurate protection action. Through an analysis of the existing solutions,the problems which need further research in the future are summarized.
The pattern of the AC-DC hybrid power grid has been basically formed in China,but difficulties still remain in the pattern's impacts on the relay protection of the AC power grid. This paper focuses on analyzing the fault features of the AC-DC hybrid power grid and its impacts on the relay protection of the AC power grid as well as necessary counter measures.For distance protection,this paper has highlighted that the measured impedance is not accurate with commutation failure. For directional pilot protection,with commutation failure it is difficult to determine the fault direction,which leads to an inaccurate protection action. For differential relay,commutation failure could reduce the reliability of protection,and the DC bias causes an inaccurate protection action. Through an analysis of the existing solutions,the problems which need further research in the future are summarized.
引文
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[4]徐政,屠卿瑞,裘鹏,等.从2010国际大电网会议看直流输电技术的发展方向[J].高电压技术,2010,36(12):3070-3077.XU Zheng,TU Qingrui,QIU Peng,et al.New trends inHVDC technology viewd through CIGRE 2010[J].HighVoltage Engineering,2010,36(12):3070-3077.
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[6]陈水明,于占清,等.互联系统电磁暂态交互作用[J].高电压技术,2011,37(2):395-403.CHEN Shuiming,YU Zhanqing,et al.Transient Interactionof HVDC and HVDC in Converterer Station in HVDC[J].High Voltage Engineering,2011,37(2):395-403.
[7]袁阳,卫志农,雷霄,等.直流输电系统换相失败研究综述[J].电力自动化设备,2013,33(11):140-147.YUAN Yang,WEI Zhinong,LEI Xiao,et al.Survey of com-mutation failures in DC transmission systems[J].ElectricPower Automation Equipment,2013,33(11):140-147.
[8]张汝莲,赵成勇,卫鹏杰,等.直流馈入后交流线路故障对换相失败瞬态特征的影响[J].电力自动化设备,2011,31(7):82-87.ZHANG Rulian,ZHAO Chengyong,WEI Pengjie,et al.Influence of AC line faults on HVDC commutation failuretransient characteristic in DC/AC interconnected powergrid[J].Electric Power Automation Equipment,2011,31(7):82-87.
[9]申洪明,黄少锋,费彬,等.交直流互联系统对距离保护动作特性的影响分析及对策[J].电力系统自动化,2015,39(11):58-63.SHEN Hongming,HUANG Shaofeng,FEI Bin,et al.An in-terline DC power flow controller suiable for VSC-MTDC[J].Auromationof Electric Power Systems,2015,39(11):58-63.
[10]费彬,黄少锋,申洪明,等.交直流互联系统对距离保护的影响分析及对策[J].电力自动化设备,2015,35(8):15-21.FEI Bin,HUANG Shaofeng,SHEN Hongming,et al.Im-pact of AC-DC interconnected system on distance protec-tion and countermeasure[J].Electric Power AutomationEquipment.2015,35(8):15-21.
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