Fault Characteristic Analysis And Protection Strategy Of Microgrid

With the rapid development of distributed generation,microgrid technology has become more and more important.Due to the diversity of distributed generation DGs,the structure of microgrid is complex and diverse,so it is used to detect faults in traditional large power networks and distribution networks with only a single power source,location and fault recovery techniques are no longer suitable for microgrids with multiple distributed power sources.Therefore,the study of fault detection,location and recovery of microgrid is of great significance to ensure the safe and reliable operation of microgrid.Most of the existing researches on fault detection and location of microgrid have some problems,such as inaccurate fault detection,and not adapting to the two modes of island operation and grid-connected operation at the same time.In this paper,based on the positive sequence component method,fault detection and location of microgrid is carried out,and the main research contents of fault recovery in microgrid are as follows:(1)an improved genetic Tabu search algorithm(IGA-TS)is used for fault recovery of microgrid.l)the equivalent fault model of microgrid is established,and the fault detection and location based on the positive sequence component method are carried out.Combined with the current research situation at home and abroad,the structure and fault of microgrid are studied and analyzed,and the equivalent fault model of microgrid is established,and the advantages and disadvantages of various fault detection and location algorithms are analyzed.Combining the advantages and disadvantages of all the algorithms,a positive sequence component method is proposed to detect all kinds of faults,and the dual terminal localization method is used to locate the faults accurately.The simulation results by Matlab show that,The proposed method can effectively detect faults and locate them accurately.The improved genetic Tabu search IGA-TS algorithm is used for fault recovery of microgrid.In this paper,several commonly used fault recovery algorithms are studied.The advantages and disadvantages of genetic algorithm and Tabu algorithm are compared and analyzed through theoretical research.The two algorithms are fused and the elite reservation strategy is added to optimize the initial solution,in order to realize the fault recovery of microgrid.Finally,IEEE33 nodes are simulated in Matlab environment,and the experimental results show that the proposed IGA-TS algorithm can effectively recover the fault of microgrid.