永磁直驱型风电机组低电压穿越的关键技术研究

Research on the Key Technologies of LVRT of Permanent Magnet Direct Drive Wind Turbine

永磁直驱型风电机组为实现低电压穿越,并网变流器一般采用抑制直流电压谐波的不对称运行控制策略。为实现电网不对称信息的准确获取,提出了建立双d-q变换软件锁相环的数学模型。最后,仿真验证了所建模型的正确性与有效性。

Wind power is one of the important ways for using renewable energy. In order to realize low voltage ride through（ LVRT）,the grid-connected converter generally adopts the asymmetrical control strategy of suppressing DC voltage harmonics,and the accurate acquisition of grid asymmetric information is the premise of this algorithm.In view of the above premise,this paper proposed a mathematical model of double d-q transform software phaselocked loop（ SPLL）,which provided accurate information for the realization of asymmetric operation control algorithm. The simulation shows that the model is correct and effective.