PUBLICATIONS

  A power conversion system in a wind turbine using a Permanent Magnet Synchronous Generator (PMSG) is directly connected

  between a generator and a grid. The capacity of power semiconductor switches and filters should be selected regarding the overall

  system rating and the output power quality. The use of an LCL-filter and n-parallel power conversion devices can be the best 

  solution for these problems in a high power system. However, the resonant pole introduced in the LC part produces resonance in 

  the system leading to the stability problem. The voltage difference between the parallel back-to-back converters generates a zero-

  sequence circulating current. In this paper, a novel control method using a PQR transformation for simultaneously compensating of 

  both the LCL-filter resonance and the zero-sequence circulating current in a wind power system driven by 3-parallel back-to-back 

  converters is proposed. The effectiveness of the proposed control method is verified by simulations.