双d,q坐标系下六相同步风力发电机控制策略

Power System Research on Control Algorithm of Six-phase Synchronous Wind Generator Under Dual d,q Coordinates

针对相移30°双Y型六相同步风力发电机,在考虑电机内部谐波磁场的基础上,建立了自然坐标系和双d,q坐标系下的电机模型;利用数学解析方式,对大型六相同步发电机的6n±1(n=1,3,5,...)次谐波分量特性进行分析。针对基波与谐波的特性,在双d,q坐标系下采用PI控制器与PR控制器相结合的控制策略,在减少控制器的同时实现了控制器之间的相互解耦。仿真和实验结果表明,该控制系统控制器数量少,无需滤波环节,能有效抑制谐波电流。

Mathematical model for six-phase synchronous wind generator with two sets of Y-connected windings phase shifted by 30 electrical degrees is established in the phase coordinate and dual d,q coordinates, in which the har- monic filed is considered.Furthermore, order of 6n ± 1 （n = 1,3,5,...） harmonic components performance are analyzed analytically.According to the characteristics of fundamental and harmonic components, control system of combined PI and PR controllers is proposed,in which the controllers are less and decoupled.Simulation and experimental results indicate that the control system contains less controllers, needs no filters and can suppress harmonic currents effectively.