1. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China; 2. State Grid Huzhou Power Supply Company, Huzhou 313000, China; 3. State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China
One distribution network often has several kinds of protection configuration schemes because of loose requirements for distribution system protection. An evaluation method based on energy loss as performance evaluation index is proposed to quantitatively compare the performance of different protection configuration schemes. Firstly, the calculation and comparison model of energy loss is established by analyzing four fundamental requirements of protection relay and the concept of long and short-term outage. Then, random variables used to form fault scenarios are determined according to different protection configurations. Monte Carlo method is used to generate random fault scenarios. Then, energy loss of different schemes in different fault scenarios can be calculated. Finally, the average energy loss of each protection scheme is calculated, and the scheme with the smallest average energy loss is selected as the best one. The validity of this method is verified by two cases of distribution network protection with different setting values and hybrid lines with or without automatic reclosing.
SHEN Yunchao, WANG Huifang, HUANG Zhihua,et al.Evaluation Method of Protection Configuration Scheme for Distribution Network[J].Automation of Electric Power Systems,2019,43(20):138-145.DOI:10.7500/AEPS20180912012Copy