The utility model discloses a power that is used for UPFC change of current valve function to debug, including the transformer, to be connected with power supply behind the former limit series connection current -limiting resistor of transformer, the total circuit breaker, connect in parallel and have the bypass switch in current -limiting resistor's both ends, and it has earthing switch still to establish ties between the connected node of current -limiting resistor and total circuit breaker, the transformer is equipped with a plurality of pairs of limits, and the quantity of waiting to debug UPFC change of current valve is no less than to the quantity on vice limit, every vice limit appoint the parallelly connected filter capacitance of output who is connected with single phase rectification bridge, single phase rectification bridge between double -phase.