永磁同步电动机弱磁控制策略的研究与仿真

Research and Simulation on Weak Flux Control Strategy of PMSM

对内置式永磁同步电机(IPMSM)的弱磁控制策略进行了仿真研究,为了提高整个系统的控制性能,在磁场定向(FOC)矢量控制算法的基础上引用了最大转矩/电流比(MTPA)算法和抗积分饱和算法。采用MTPA控制方式使电机在弱磁阶段合理分配定子电流i_(s)的交、直轴分量i_(q)和i_(d),以最小的电流损耗产生了相同情况下的最大转矩输出;由于电机在弱磁阶段会一直运行在基速以上,对电机控制系统来说属于超高速运行,很容易使电流环和速度环的PI调节器出现积分饱和的现象。所以,为了避免该现象的发生,提出了在转速环和电流环采用改进的PI控制策略,在传统PI控制策略的基础上引入抗积分饱和方法,从而有效改善了环路的动态性能。最后介绍了在Matlab/Simulink环境中搭建的弱磁仿真模型,通过对相关工况的模拟仿真,证明了该控制策略的可行性。

The weak flux control strategy of internal permanent magnet synchronous motor(IPMSM)is simulated and researched.In order to improve the control performance of the whole system,this paper introduces the maximum torque per ampere(MTPA)algorithm and anti-integral saturation algorithm based on the field orientation vector control(FOC)algorithm.MTPA control mode is adopted to reasonably distribute the quadrature axis components iq and direct axis component id of stator current is of motor in weak flux stage,which produce the maximum torque output under the same condition with the minimum current loss.Because the motor will always operation above the base speed in the weak flux stage,it belongs to ultra-high speed operation for the motor control system,which is easy to cause the integral saturation phenomenon of the PI regulator of the current loop and speed loop.Therefore,in order to avoid this phenomenon,this paper proposes an improved PI control strategy in the speed loop and current loop,which introduces the anti-integral saturation method based on traditional PI control strategy and then effectively improve the dynamic performance of the loop circuit.Finally,this paper introduces the weak flux simulation model built in Matlab/Simulink environment.Through the simulation of relevant operating condition,it is proved that the control strategy is feasible.