According to the performance analysis of the mathematical model of the three-phase grid-connected inverter (GCI) of directly-driven wind turbine with permanent magnet synchronous generator (D - PMSG) under unbalanced grid conditions, a dual current-loop control strategy (DCC) which oriented on positive and negative voltage and current respectively was proposed to inhibit the DC voltage fluctuation and complete the wind generator un-off-line operation on grid faults. A 1. 5MW D - PMSG with back-to-back IGBT frequency converter was simulated in the PSCAD/EMTDC environment, simulation results verify the correctness of the proposed control strategy.%在分析不对称电网电压条件下直驱永磁风力发电机组并网逆变器数学模型的基础上,提出了正负序双电流闭环控制策略,完成风力发电机组在电网发生不对称故障下的不脱网运行.在PSCAD/EMTDC环境下建立基于IGBT背靠背变频器的1.5 MW永磁直驱风力发电系统仿真模型,仿真结果证明该控制策略的可行性.
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