电网电压不对称故障时双馈风电机组多目标优化控制

Multi-objective optimization control of doubly-fed induction generator under asymmetrical grid voltage fault

文章首先对电网不对称故障对双馈风电机组造成的影响进行分析,采用转子侧和网侧变换器的比例积分谐振控制器(PIR)来简化传统低压穿越控制结构;通过引入两个可调参数,从而对前馈量进行调节来得到不对称故障期间双馈电机的多目标优化控制策略;在仔细研究模型的基础上,通过对电网电压不对称故障时双馈风电机组的多目标优化控制的PSCAD模型进行仿真试验,仿真结果表明,该方案对于电网电压不对称故障时的LVRT有一定的可行性。

Firstly, the impact of asymmetric grid fault on double-fed wind turbine is analyzed, and the proportional integral resonant （PIR） controller of rotor side and grid side converter are used to simplify the traditional low voltage ride through control structures; two adjustable parameters are introduced to control the feedforward, which achieves multi-objective optimization control of DFIG during asymmetric grid voltage dip. The model is carefully researched on PSCAD, the results show that the multi-ob- jective optimization control strategies can effectively help DFIG to provide LVRT capability when the grid voltage asymmetric dip occurs.