光伏电站汇集系统单极接地故障的皮尔逊相关系数识别方法

为避免光伏直流升压汇集系统发生单极接地故障时影响系统的正常运行,提出一种基于皮尔逊相关系数的汇集系统直流侧单极接地故障识别方法.首先阐述汇集系统直流侧经分裂电容接地方式,接着重点分析接地故障时的故障特性,随后阐述皮尔逊相关系数的原理并利用相关系数对单极接地故障进行原理分析,最后提出利用直流电抗器在单极接地故障时故障线路...

Single-pole Grounding Fault Identification Method for Photovoltaic Power Station Collection System Based on Pearson Correlation Coefficient

To ensure that the normal operation of the system will not be affected when a single-pole grounding fault oc?curs to the photovoltaic DC boost collection system,an identification method for single-pole grounding fault on the DC-side of the collection system based on the Pearson correlation coefficient is proposed in this paper.First,the method of using split capacitor grounding on the DC-side of the collection system is described.Second,the fault characteristics of grounding fault are analyzed specifically.Third,the principle of the Pearson correlation coefficient is explained,and the principle of single-pole grounding fault is analyzed by means of the correlation coefficient.Finally,the difference in the Pearson correlation coefficients between the faulted and non-faulted lines under single-pole grounding fault is used to identify the single-pole grounding fault using a DC reactor.The simulation software RSCAD/RTDS is used to simulate the fault characteristics,and the simulation analysis shows that the proposed method can identify single-pole grounding faults.In addition,it is simple,reliable,and accurate,which can protect and identify the full length of the line.