Method for positioning short-circuit fault area of grid-connected mode alternating-current micro-grid

The invention provides a grid-connected mode alternating-current micro-grid short-circuit fault area positioning method, which is used for performing area positioning on grid-connected mode alternating-current micro-grid short-circuit faults under different capacities, and comprises an approximate model establishment method and a fault area positioning method, a rapid calculation model for positioning a short-circuit fault area is constructed through an OLS-RBF neural network algorithm, and when a current wavelet energy spectrum value measured at a micro-grid detection point is greater than a fault detection threshold value, it is judged that a short-circuit fault occurs on a feeder line. The size of the first peak value of the fault current wavelet energy spectrum waveform, the micro-grid capacity at the moment and the detected fault initial phase angle are substituted into a fault area positioning formula corresponding to the fault type to calculate the distance from the short circuit point to the detection