永磁感应电机无功抑制研究与仿真

The Research and Simulation of Reactive Power Restrained for Permanent Magnet Induction Machine

为抑制永磁感应电机(PMIM)的无功功率,提高其效率和功率因数,文章提出了PMIM的直接功率控制(DPC)方法。在分析PMIM的有功、无功功率之后,建立了PMIM的同步旋转坐标系数学模型。通过定子磁链位于不同扇区的功率特性分析,得到不同电压矢量对有功、无功功率的影响因素,对PMIM实施直接功率控制(DPC)的瞬时功率开关表,实现了直接功率控制,从而将无功功率抑制在零附近。仿真结果表明在同样有功功率输出的条件下,DPC方法能有效地减小无功功率,提高功率因数,达到节能目的。

In order to reduce the reactive power, improve power factor and efficiency of permanent magnet induc-tion machine（PMIM）, a direct power control（DPC） method is proposed in this paper. After analyzing the activepower and reactive power, the mathematical model of PMIM was established based on the rotating coordinate sys-tem. According to the analyzing the power characteristic of different vectors which vectors exist, the vectorswitch table of the direct power control（ DPC） was established. By this method the reactive power can be re-strained around zero. Simulation results show that under the same conditions of active power output, DPC methodcan effectively reduce the reactive power, improve power factor, to save energy.