| 摘要 |
An intelligent power control unit (IPCU) for low voltage ride through (LVRT) and its application. The intelligent power control unit is provided with a port A, a port B, a port C, an internal auxiliary converter for stabilizing the voltage of a stator and supplying reactive power at the moment of riding through, and a controllable active load for absorbing active power. High speed switches are provided between the port A and the port B, and the internal auxiliary converter is provided between the port A and the port C. The internal auxiliary converter and the controllable active load are sequentially connected in series between the port A and the port C; or, the internal auxiliary converter is connected with the controllable active load from the port A through three-phase bridge rectification, whereby the branch of the internal auxiliary converter is connected in parallel with the branch of the controllable active load. During application, the port A is connected with the stator winding of a wind power generator set, the port B is connected with the power grid, and the port C is connected with the direct current (DC) bus of an external auxiliary converter. |
