基于对地参数测量的配电网故障选相与有源消弧方法研究  

Study on Fault Phase Selection and Active Arc Suppression Method in Distribution Network Based on Measurement of Ground Parameters

作　　者：佟欣 宋国兵[2] 张志华 汪俊锋 雷智荣 TONG Xin;SONG Guobing;ZHANG Zhihua;WANG Junfeng;LEI Zhirong(School of Electrical Engineering,Xinjiang University,Urumqi 830017,Xinjiang,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China;State Grid Shaanxi Electric Power Research Institute,Xi’an 710100,Shaanxi,China;Xi’an Xirui Control Technology Co.,Ltd.,Xi’an 710077,Shaanxi,China)

机构地区：[1]新疆大学电气工程学院,新疆乌鲁木齐830017 [2]西安交通大学电气工程学院,陕西西安710049 [3]国网陕西省电力公司电力科学研究院,陕西西安710100 [4]西安西瑞控制技术股份有限公司,陕西西安710077

出　　处：《电气传动》2023年第7期56-63,共8页Electric Drive

基　　金：陕西省重点研发计划项目(2019ZDLGY18-07);国网陕西省电力公司科技项目(B626KY190001)。

摘　　要：由于在单相接地故障前后配电网对地参数发生变化,传统有源消弧法以配电网正常运行状态下的对地参数为依据得到的补偿电流参考值与实际值存在偏差。针对故障点残流无法实现完全补偿导致熄弧困难的问题,通过中性点接入的有源消弧装置向配电网注入特征频率电流信号,消除系统频率对配电网对地等效参数测量精度的影响,构建特征信号流通回路,实现配电网在接地故障后的对地等效参数测量。然后根据实时测量的对地参数和零序电压,动态计算补偿电流,控制有源消弧装置向中性点注入电流实现故障消弧,并提出通过注入零序电流的方法得到故障相电压的幅值及相位,实现故障相辨识。最后,在PSCAD/EMTDC仿真软件中验证了所提方法能够实时反映配电网对地参数变化,实现了故障支路电流全补偿,达到配电网接地故障快速熄弧的目的。Due to the change of the ground parameters of the distribution network after the single-phase grounding fault,the traditional active arc suppression method based on the ground parameters in the normal operation state has a deviation between the compensation current reference value and the actual value.In consideration of the problem that the fault residual current cannot be fully compensated,which leads to difficulty in arc extinguishing,the characteristic frequency current signal was injected into the distribution network through the active arc suppression device connected to the neutral point,to eliminate the influence of the system frequency on the measurement accuracy of the equivalent parameters to the ground of the distribution network.By constructing a characteristic signal circulation loop,the measurement of the equivalent parameters to the ground of the distribution network after ground fault was realized.Then,according to the real-time measured ground parameters and zerosequence voltage,the compensation current was dynamically calculated,and the active arc suppression device was controlled to inject current into the neutral point to realize the fault arc suppression.And the method of injecting zero-sequence current was proposed to obtain the amplitude and phase of the faulted phase voltage which can be used to detect the faulted phase.Finally,it is verified in PSCAD/EMTDC that the proposed method can reflect the changes of ground parameters of the distribution network in real time,realize full compensation of fault branch current,and achieve the purpose of rapid arc extinguishing of ground faults in distribution network.

关 键 词：配电网 单相接地故障 对地参数测量 有源消弧 故障选相 动态补偿 

分 类 号：TM71[电气工程—电力系统及自动化]