Simulation Research on Short-Circuit Fault Protection of Grid-Connected AC Microgrid Considering Topology Change

With the development of microgrid technology, short-circuit fault detection and location research has become a key link in the development of microgrid technology. In view of the limitation that the existing short-circuit fault protection schemes of micro grid do not consider the change of topology structure during the operation of micro grid, this paper simulates the short-circuit fault operation state of grid-connected AC microgrid considering the change of topology structure, and analyzes it by using the wavelet energy spectrum change method, proposes a short-circuit fault protection method that can adapt to the change of topology structure.