基于相暂态功率方向的有源配电网接地故障区段定位算法

Ground Fault Section Positioning Algorithm of Active Distribution Network Based on Phase Transient Power Direction

分布式电源接入配电网后,利用相电流突变的接地故障判断算法准确度下降。为了解决以上问题,提出基于相暂态功率方向的有源配电网接地故障区段定位算法。通过建立有源配电网接地故障暂态相电压电流等效模型,分析出健全线路各区段的各相暂态功率方向为正,故障电流由母线流向线路,故障线路故障点下游各区段相暂态功率绝对值较大的方向为正,故障线路故障点上游各区段暂态功率绝对值较大相的方向为负,根据以上特征,设计了接地故障定位装置以及相暂态功率方向算法。通过仿真验证结果表明,该方法在配电网中性点采用小电流接地系统时,在分布式电源投入与退出、接入数量和位置不同以及不平横电流情况下,均能可靠判断与定位接地故障位置。相关研究及其设计能够为有源配电网接地故障定位技术的发展与应用提供参考。

After the distributed power supply is connected to the distribution network,the accuracy of the grounding fault judgment algorithm using the phase current mutation is reduced.In order to solve the above problems,the grounding fault section positioning algorithm of active distribution network based on phase transient power direction is proposed.By es-tablishing the equivalent model of grounding fault transient phase voltage and current of active distribution network,the analysis results show that the direction of the fault current flows from the bus to the line,and the fault line fault point downstream of the fault of the transient power absolute value is negative.According to the above characteristics,the grounding fault positioning device and phase transient power direction algorithm is designed.The simulation verification results show that this method,in which the small current grounding system at the neutral point of the distribution network is used,can be adopted to reliably judge and locate the grounding fault position in the distributed power input and exit,and different access quantity and position in the case of uneven current.Related research and its design can provide ref-erence for the development and application of grounding fault positioning technology of active distribution network.