[Oral Presentation]Research on Safety Evaluation of Grounding Grids Based on Binary Interval Numbers

Research on Safety Evaluation of Grounding Grids Based on Binary Interval Numbers

ID：92 Submission ID：1470 View Protection：ATTENDEE Updated Time：2020-10-30 14:32:29 Hits：243 Oral Presentation

Start Time：2020-11-02 11:00 （Asia/Shanghai）

Duration：15min

Session：[E] Electrotechnical Theory and New Electromagnetic Technology » [E2] Session 15 and Session 20

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Abstract

With the overall advancement of UHV AC and DC lines and the gradual development of large cross-regional power grids, the effective grounding of power equipment plays an important role in the safe and stable operation of the power system. Regarding the numerical uncertainty caused by the measurement of grounding grid parameters, this paper proposes a multi-dimensional safety evaluation method for grounding grids based on the gray correlation degree of interval numbers. First, construct an evaluation index system and use the coefficient of variation to determine the index weight, avoiding the subjectivity brought about by expert empowerment. Second, determine the evaluation level and construct an interval number evaluation matrix. Then, the kernel density estimation is used to fit the interval number evaluation value into a probability density distribution. Finally, the final evaluation results are gotten by evaluating the weighted JS divergence between the probability density distribution and the optimal distribution. Through an empirical analysis of a 220kV substation in Zhejiang, the effectiveness of the method is verified.

Keywords

substation;binary interval number;assess safety;grey relational degree

Speaker

Hongpeng Xie

student Chongqing university

Submission Author

Yifan He the Research Institute of State Grid Zhejiang Electric Power Limited Company

Chengyuan Liu the Research Institute of State Grid Zhejiang Electric Power Limited Company

Jiayuan Hu the Research Institute of State Grid Zhejiang Electric Power Limited Company

Hongpeng Xie Chongqing university