基于故障暂态电流Pearson相关系数的直流配电网保护

Protection of DC Distribution Network Based on Pearson Correlation Coefficient of Fault Transient Current

对直流配电网保护技术的研究是保证其安全稳定运行的前提,为此提出一种基于故障暂态电流Pearson相关系数的纵联保护方案。首先分析了区内外不同故障类型下换流站电容电流与线路保护安装处测量电流之间的关系特征,之后利用Pearson相关系数表征上述两个电流的方向性和相关性,并根据线路两端Pearson相关系数的正负和大小设计保护判据,最后在Matlab/Simulink中搭建直流配电网的模型,通过对双端以及多端直流配电网故障的仿真分析,验证了该保护方案的有效性和实用性。

Research on the protection technology of DC distribution network is the premise to ensure its safe and stable operation.Therefore,a longitudinal protection scheme based on the Pearson correlation coefficient of fault transient current is proposed in this paper.Firstly we analyzed the capacitance current under different fault types and the relationship between the protection installation area measuring current characteristics,after using the Pearson correlation coefficient characterizing the directivity of both current and relevant,and according to the Pearson correlation coefficient of the positive and negative on both ends of the line and size design criterion.Finally we set up model of dc power distribution network in Matlab/Simulink.By means of double side and multi-terminal dc power distribution network fault simulation analysis we verified the validity and practicability of the protection scheme.