Patent ID: 9140744
Filing Date: 2015-09-22
Classification: G01R,H02H

Abstract:
1. A self-test method for an active crowbar circuit, wherein the active crowbar circuit is applied to a doubly-fed induction generator system having a rotor and a rotor-side converter, the method comprising the steps of: driving the rotor-side converter to turn on to allow the rotor-side converter to control the current of the rotor so as to maintain a root-mean-square value of the current of the rotor at a predetermined minimum value; driving the rotor-side converter to turn off and driving the active crowbar circuit to turn on; determining if the active crowbar circuit can be turned on normally, wherein the current of the rotor is larger than a predetermined current value within a predetermined time period when the active crowbar circuit is turned on normally; driving the active crowbar circuit to turn off; and determining if the active crowbar circuit can be turned off normally, wherein the current of the rotor is smaller than the predetermined current value within the predetermined time period when the active crowbar circuit is turned off normally.