Precise Fault Location Method of Traveling Wave in Distribution Grid Based on Multiple Measuring Point

Aiming at the problems existing in the current fault location methods of distribution grid, such as precise calculation of wave velocity and the finite precision of fault location, a precise fault location method of traveling wave in the distribution grid based on multiple measuring points is proposed. In this method, the line-mode traveling wave of a specific frequency is selected as the basis for the time calibration of the initial wave head, and the circuit is divided into fault zone and non-fault zone. The traveling wave velocity is real time calculated by using the traveling wave of the non-fault zone. The fault branch identification matrix (FBIM) is constructed and compared with the fault branch identification array line by line to identify the fault branch (FB). On this basis, the fault distance is solved precisely by using redundant end-point traveling wave and least square method. This method only requires the placement of measuring points at the end of each branch, which to some extent solves the problem of limitation of measuring point allocation. Simulation results show that the method is highly reliable and has high fault location accuracy in different fault locations.