The invention relates to an intelligent power control unit (IPCU) for low voltage ride through, which comprises a port A, a port B, a port C, a built-in auxiliary frequency converter for stabilizing stator voltage at the moment of ride through and for providing reactive power, and a controllable active load for absorbing active power; a high speed switch is arranged between the port A and the port B; the built-in auxiliary frequency converter is arranged between the port A and the port C; and the built-in auxiliary frequency converter and the controllable active load are sequentially connected between the port A and the port C in series or connected with the controllable active load from the port A through a three-phase bridge-type rectifier, so that the branch circuit of the built-in auxiliary frequency converter is connected with that of the controllable active load in parallel. When the IPCU is used, the port A is connected with the stator winding of a wind generating set, the portB is connected with the power network, and the port C is connected with the DC bus of an external auxiliary frequency converter.