Device and method for cooperatively controlling unbalanced current of doubly-fed converter

The invention relates to a device and a method for cooperatively controlling unbalanced current of a doubly-fed converter. The control method comprises a machine side converter control method and a grid side converter control method, wherein the machine side converter control method comprises the following steps: detecting the negative sequence component of a present stator voltage vector, calculating a rotator negative-sequence current needed for limiting a current unbalance, taking the value of the rotator negative-sequence current as the reference input of a rotator current negative-sequence control to perform the rotator current negative-sequence control; and the grid side converter control method comprises the steps of detecting the negative-sequence component of the present stator current and taking the negative-sequence component of the stator current as the reference input of a grid side current negative-sequence control to perform the grid side current negative-sequence control. The control method has the advantages that the unbalance of the stator current can be effectively inhibited, the loss of a generator set is reduced, the problems of a reactive power pulsation and an active power pulsation are solved; and at the same time, the unbalance degree of a system total-grid current is reduced, so that the power quality and the grid adaption capacity of the generator set are improved.