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中文摘要：
分析电网发生不对称故障对直驱永磁风力发电机组（D—PMSG）的影响，研究其控制策略，以提高其不对称故障穿越的能力。把电网电压实时引入机侧整流器参考功率的计算中，提出了按照电网正序电压和其额定电压的比减小发电机输出功率的控制策略。建立了经背靠背双PWM变流器并网的D—PMSG仿真模型。机侧整流器控制内环采用电流前馈控制，外环采用功率环控制发电机输出功率。网侧逆变器控制内环采用电流前馈控制，并控制负序电流为零，外环采用电压环稳定直流电压。仿真结果表明，在不对称故障时，这种策略保持了发电机功率平衡和变流器功率平衡，限制了直流电压的升高，保持了逆变器三相电流对称，实现了机组不对称故障穿越。
英文摘要：
The control strategy for directly driven wind turbine with permanent magnet synchronous generator （D-PMSG） was investigated to enhance its capability of faults ride through （FRT）. The positive and negative sequence components were detected by using instantaneous symmetrical components method on grid voltage. Based on the analysis of the effect on D-PMSG of grid asymmetrical faults, the grid positive sequence voltage was introduced to the calculation of gen-side rectifier reference power. The control strat- egy was proposed to reduce generator power based on the ratio of positive sequence and rate grid voltage. A D-PMSG model connected with grid was established. The current feedforward control was applied to inner loop and the power control was used in outer loop, for gen-side rectifier. For grid-side inverter, the negative sequence current was regulated at zero in inner loop and the DC voltage was stabilized in outer loop. Simulation results showed that during asymmetrical grid faults the proposed strategy could keep power balance of PMSG and the converters, limit the DC-voltage and maintain the inverter current symmetrical. The FRT capability of D-PMSG is improved.
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