谐振接地系统单相接地故障有源电流注入全补偿消弧研究  

Study on Full Compensation Arc Suppression of Active Current Injection for Single-phase Grounding Fault of Resonant Grounding System

作　　者：李琦 彭书涛 任冲 张志华 赵倩 LI Qi;PENG Shutao;REN Chong;ZHANG Zhihua;ZHAO Qian(State Grid Shaanxi Electric Power Company,Xi’an 710048,China;State Grid Shaanxi Power Research Institute,Xi’an 710110,China;Northwest Branch of State Grid Corporation of China,Xi’an 710048,China;Guizhou Power Grid Power Dispatching Center,Guiyang 540002,China)

机构地区：[1]国网陕西省电力公司,西安710048 [2]国网陕西省电力公司电力科学研究院,西安710110 [3]国家电网有限公司西北分部,西安710048 [4]贵州电网有限责任公司电力调度控制中心,贵阳540002

出　　处：《电力电容器与无功补偿》2020年第5期118-124,共7页Power Capacitor & Reactive Power Compensation

基　　金：国家自然科学基金项目(U1766208)。

摘　　要：针对中/低压谐振接地配电网的故障消弧难题,提出一种消弧线圈结合单相级联H桥变流器的新型的主从式有源消弧方案。通过实时采集并跟踪故障残流,设计了H桥逆变器和PI控制系统,通过向中性点注入与故障残流等幅反相的可控电流实现接地故障电流全补偿,进而达到故障有效灭弧目的。仿真结果显示,所提方案能够较好满足接地故障电流全补偿的要求,可以快速、有效地补偿配网单相接地故障电流的有功、无功以及谐波分量,实现可靠熄弧,提高配电网的供电可靠性。In view of such difficult as fault arc suppression of medium/low voltage resonant grounding distribution network,a kind of a new master-slave active arc-suppression scheme combining arc suppression coil and single-phase cascade H-bridge converter is proposed in this paper.H-bridge inverter and PI control system are designed by real time collecting and tracking the fault residual current.The full compensation of the ground fault current is achieved by way of injecting the neutral point with controllable current with equal amplitude and opposite phase of fault residual currentso as to achieve effective arc extinguish of the fault.It is shown by the simulation results that the proposed scheme can meet the requirements of full compensation of ground fault current,can quickly and effectively compensate the active,reactive and harmonic components of ground fault current of the distribution network achieve reliable arc extinguishing and improve the power supply reliabilityof distribution network.

关 键 词：配电网 单相接地故障 故障残流 有源全补偿 

分 类 号：TM862[电气工程—高电压与绝缘技术]