混合无功补偿对特高压输电线路的影响机制研究  

Influence Mechanism of Hybrid Reactive Compensation on UHV Transmission Lines

作　　者：张婧[1] 杨小霞 杜巍 ZHANG Jing;YANG Xiaoxia;DU Wei(Xuchang Vocational and Technical College,Xuchang 461000,China;State Grid Henan Xuchang Jian’an Power Supply Company,Xuchang 461100,China;State Grid Ningxia Electric Power Maintenance Company,Yinchuan,750011,China)

机构地区：[1]许昌职业技术学院,河南许昌461000 [2]国网建安供电公司,河南许昌461100 [3]国网宁夏电力检修公司,宁夏银川750011

出　　处：《智慧电力》2020年第5期92-98,共7页Smart Power

基　　金：国家重点研发资助项目(2017YFB0902100)。

摘　　要：混合无功补偿(HRPC)由串联补偿(SC)和步进控制并联电抗器(SCSR)组成,将逐渐成为中国特高压输电系统中无功补偿的趋势.提出了UHV输电线路单相接地故障时二次电弧的一些新特性,针对应用HRPC的UHV交流系统在单相自动重合闸(SPAR)运行过程中产生二次电弧的特性进行了仿真.从理论上推导了HRPC对二次电弧电流的影响机制,并给出了仿真波形和傅立叶分析.详细研究了二次电弧电流、不同无功功率补偿度下电弧的燃弧时间、中性点电抗和接地故障位置之间的关系.最后,提出了一种改进的旁路断路器和SPAR的时序控制策略,该策略将为未来HRPC在UHV输电线路中的应用提供必要的理论依据和技术支持.Hybrid reactive power compensation(HRPC)which consists of series compensation(SC)and step control shunt reactor(SCSR)will gradually become the trend of reactive power compensation in China’s UHV transmission system.Some new characteristics of secondary arc in single-phase grounding fault of UHV transmission line are presented.The characteristics of secondary arc in single-phase automatic reclosure(SPAR)operation of UHV AC system with HRPC are simulated.The influence mechanism of HRPC on secondary arc current is deduced theoretically,and the simulation waveform and Fourier analysis are presented.The relationship among secondary arc current,arc ignition time,neutral point reactance and ground fault location under different reactive power compensation is studied in detail.Finally,an improved sequential control strategy for bypass circuit breaker and SPAR is proposed,which will provide necessary theoretical basis and technical support for the future application of hybrid reactive power compensation in UHV transmission lines.

关 键 词：混合无功补偿 二次电弧 单相自动重合闸 特高压 

分 类 号：TM131[电气工程—电工理论与新技术]