一种基于铁损模型的异步电机矢量控制策略

Vector control strategy of induction motor based on iron loss model

为了解决矢量控制算法因受铁损影响而导致的定向失准、性能下降等问题,提出了一种基于铁损模型的异步电机矢量控制策略。该策略直接依据励磁电感电流进行转差型间接磁场定向矢量控制,实现磁链和转矩分量间的解耦。依据铁损数学模型,分析了铁损对间接转子磁场定向矢量控制的影响,设计了滑模观测器对励磁电感电流进行观测。本方案的突出优势在于无论是励磁电感电流的观测,还是矢量控制系统的实现均无需铁损电阻参数,具有较强的工程实用性。仿真和实验结果表明,本文提出的控制策略可以解决由铁损导致的矢量控制定向和转矩控制失准的问题,改善了系统运行性能。

To solve the problems of field orientation loss and performance degradation resulting from iron loss in the vector control system,a vector control strategy based on iron loss model of induction motor(IM)is proposed in this paper.In this strategy,a slip-type indirect field oriented vector control(IFOC)is designed by choosing alternatively the magnetizing currents as controlled variables directly,which allows decoupling control between the magnetizing and torque-producing components.Starting from the iron loss model of IM,the detrimental effects of the iron loss on the IFOC were analyzed,and a sliding-mode observer was invented to obtain the magnetizing currents.One of the merits pertinent to the proposed control strategy is that the iron loss representation appears neither in the observer nor in the vector control ontology,which benefits the implementation in practice.Simulation and experiments prove that the negative effects of neglecting the iron loss on the orientation and torque tracking are avoided in this proposed strategy,and the operation performance is improved consequently.