基于瞬时转差频率控制的定子双绕组异步电机变频交流发电系统

Dual Stator-Winding Induction Generator Variable Frequency AC Generation System Based on Slip Frequency Control

研究了一种基于定子双绕组异步电机(DWIG)的变频交流发电系统,根据功率平衡思想提出了该变频交流发电系统的瞬时转差频率控制策略。该策略省去了复杂的坐标变换和影响动态性能的电流环,综合考虑了输出电压和输出电流二者的变化信息,利用电压矢量去调节发电机的瞬时转差频率,进而改变电磁转矩,保证输出电压稳定。在一台15 kW样机上进行了一系列实验研究,实验结果证明了该变频交流发电系统的可行性和控制策略的有效性。

A variable frequency AC （VF AC） generation system based on the dual stator-winding induction generator （DWIG） is studied. According to the idea of power balance, the instantaneous slip frequency control principle for this VF AC generation system is proposed, in this strategy, there is no complex coordinate transformation and current control loop which usually slows down the dynamic regulation process. The information of output voltage and output current are incorporated into this control scheme, and the voltage vector is employed to regulate the instantaneous slip frequency to change the electromagnetic torque, so that the output voltage can be kept stably. The experimental results from a 15kW prototype prove the feasibility of this VF AC generation system and the validity of the proposed control strategy.