Abstract
Parallel connection is an effective method to improve the working efficiency of permanent magnet direct drive wind power system, but it will lead to the emergence of circulating current. In view of the circulating current phenomenon, based on the PWM back-to-back topology of permanent magnet direct drive wind power system, the mechanism of generator side circulating current is analysed, that is, it is caused by the inconsistency of zero sequence switching values of two rectifiers, which makes the rectifier uneven current phenomenon. At the same time, the mathematical model of circulation is also established. Based on the above analysis, a circulation controller is designed based on LADRC, which solves the problem of uneven flow caused by circulation and effectively suppresses the circulation. Finally, the simulation results of the parallel system prove the effectiveness of the established mathematical model and the designed circulating current controller.
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