基于模型预测的永磁同步电机直接转矩最优控制器设计

Optimum Controller Design for DTC of PMSM Based on Model Prediction

针对内埋式永磁同步电机高凸极率的特点,设计了一种基于模型预测的直接控制方法。建立了永磁同步电机的离散化预测模型与dq坐标系下的逆变器电压矢量模型,并针对电磁转矩脉动、电机最优运行状态构建了评价函数,通过评价函数对逆变器当前状态每个可能的电压矢量进行选取,去除了滞环比较器环节,进而实现多优化目标的综合最优控制。仿真结果表明,该方法能够实现多优化目标控制,抑制逆变器电压饱和现象,具有良好的调速性能。

For the characteristics of the high salient rate of interior permanent magnet synchronous motor( PMSM),a direct control method based on model prediction was designed. The discretization prediction model of PMSM and the voltage vector model of inverter in dq coordinate system were established. The evaluation function of electromagnetic torque ripple and optimum serviceability of the motor was constructed. Through the evaluation function every possible voltage of inverter current state vector was chosen and the link of hysteresis comparator was removed to accomplish the goal of comprehensive optimal control. The simulation results show that the method can achieve multi- objective optimum control and the inhibition of inverter voltage saturation phenomenon,and has a good performance of speed adjustment.