一种新颖的分段式优化最大转矩电流比算法

Research on a Novel Segmented Optimum Maximum Torque Per Ampere Algorithm

为了充分利用最大转矩电流比(maximum torque per ampere,MTPA)算法对永磁同步电机控制的高效性特点,该文提出了一种新颖的分段式优化MTPA算法,将其应用扩展至电机全速范围。在低速区,提出了带有虚拟电压(virtual voltage,VV)控制量的准线性解耦MTPA算法,该算法线性化电压外环并消除电感耦合影响,将传统MTPA扩展至弱磁I区,提高了电机单位电流利用率,简化了控制器的设计。在高速弱磁区,提出基于最小值寻找(minimum value searching,MVS)的动态MTPA算法,在当前运行状况下实时寻找最优电流矢量,消除了电机参数变化带来的轨迹不准确性,通过对d轴电流的在线调整,提高了该算法抗负载转矩扰动的能力。仿真和实验结果表明,所提出的方法对于提高MTPA算法在工程实践中的应用具有合理性。

To take full advantage of the high efficiency characteristics of maximum torque per ampere （MTPA） algorithm for permanent magnet synchronous motor control, this paper proposed a novel segmented MTPA optimization algorithm, and extended its application to full speed range of motor. In low-speed area, a quasi-linear decoupling MTPA with virtual voltage （VV） was proposed with the aim of linearizing the outer voltage-loop and eliminating inductive coupling effects, extending traditional MTPA to flux-weakening I region, which improved motor current utilization per unit, and the design of the controller simplified. In the high-speed flux weakening region, a novel dynamic MTPA algorithm based on minimum value searching （MVS） is proposed, in real-time to conduct the seek for the optimal current vector under current operational status, which eliminates trajectory inaccuracy caused by the changes of motor parameters, through online adjusting for the d-axis current, this algorithm enhances the motor capability of anti-load torque disturbance. The simulation and experimental results indicate that the proposed method for improving the MTPA algorithm in engineering is of reasonable practicability.