Patent ID: 8570003
Filing Date: 2013-10-29
Classification: H02P

Abstract:
1. A power conversion system for a double fed induction generator (DFIG), comprising: a rotor connection including a plurality of electrical connections coupleable to rotor leads of the DFIG; a stator connection including a plurality of electrical connections coupleable to stator leads of the DFIG; a DC circuit with at least one capacitance; a first converter circuit coupled with the rotor connection and with the DC circuit and comprising a first rectifier circuit and a first switching circuit; a second converter circuit coupled with the stator connection and with the DC circuit and comprising a second rectifier circuit and a second switching circuit; a protection circuit coupled with the rotor connection and operative in a first mode to connect a protection load to the rotor connection to conduct current from the rotor leads of the DFIG to protect the first converter circuit and in a second mode to disconnect the protection load from the rotor connection; and a first switching controller comprising at least one rotor outer loop regulator operative to generate at least one rotor outer loop regulator output and a pulse width modulation component operative to provide rotor switching control signals to operate the first switching circuit at least partially according to the at least one rotor outer loop regulator output in a first mode to provide power from the rotor connection to the DC circuit, and a preload component operative to determine at least one rotor outer loop regulator output preload value based at least partially on at least one stator current value of the DFIG and to provide the first switching controller with the at least one rotor outer loop regulator output preload value to begin regulation when the protection circuit is switched from the first mode to the second mode.