A fuzzy set based synthetical approach of faulty line selection for single-phase ground fault
The single-phase earth fault of the distribution network is an important problem that needs to be solved in the grid system fault.The correct selection of the distribution network is the key to solving this problem.Since there are many types of single-phase ground faults,and the corresponding solution for each case will be different,the traditional line selection method is difficult to effectively solve the fault.After comprehensive consideration,this paper designed a fault line selection method,which integrates a large number of single methods and makes comprehensive judgments on a variety of sampled signals,resulting in a more effective and reliable line selection result than before.In this paper,the fuzzy theory is analyzed in detail.We established the measure membership functions and corresponding weight system functions of zero-sequence active power method,zero-sequence current fifth harmonic ratio method and zero-current ratio method.Based on the information fusion theory,a fault line method is designed.Using MATLAB to build two three-phase simulation systems,respectively ungrounded systems and arc suppression coil grounding systems.Then artificially introduce single-phase ground faults at different locations in each system,sample and analyze the three-phase voltage,zero-sequence voltage,three-phase current,and zero-sequence current of each system line under each fault.Finally,use the designed comprehensive line selection method to obtain the simulation result,proving that the method can be used fordistribution net-work neutral point grounding and neutral point via arc suppression coil grounded system.In the end,it is proved by MATLAB simulation that this method is suitable for the selection of line neutral point ungrounded and neutral point arc-suppression coil grounding system as well.The conclusion is that this integrated line selection method can provide more comprehensive and accurate discrimination criteria for line selection than the traditional single line selection method.
Single-phase Fuzzy control MATLAB simulation
Tingkang PENG Ziqiang XI Liang SHUAI
Solar Energy Building,Hubei University of Technology,Wuhan,Hubei Province,430068,China
国际会议
武汉
英文
356-365
2018-08-21（万方平台首次上网日期，不代表论文的发表时间）