考虑位置观测误差的永磁同步电机无传感器驱动系统MTPA控制策略

MTPA Control Strategy Considering Position Estimation Error for Sensorless Drive System of Permanent Magnet Synchronous Motor

最大转矩电流比(MTPA)控制是提升永磁同步电机无传感器驱动系统效率的重要手段之一。在无传感器驱动系统中,传统计算法根据公式推导最优电流矢量角解析解,无法计及位置观测误差变化的特性,而注入虚拟信号寻优方法受位置观测误差影响精度降低。为解决该问题,提出一种考虑位置观测误差的MTPA方法。所提方法通过比较上述两种方法在无传感器驱动系统中对最优电流矢量角不同的追踪结果估计位置观测误差,利用估计的位置误差对电机数学模型进行校正以实现最优电流矢量角高精度追踪。最后,在2.2kW内置式永磁同步电机实验平台验证了所提方法的有效性。

Maximum torque per ampere(MTPA)control is one of the important methods to improve the efficiency of sensorless drive system of permanent magnet synchronous motor(PMSM).In the sensorless drive system,the traditional calculation method deduces the analytical solution of the optimal current vector angle according to the formula,which ignores the characteristics of the position error changes,and the accuracy of the injection virtual signal optimization method is also reduced by the position error.In order to solve this problem,an MTPA control method considering position estimation error was proposed.By comparing the optimal current vector angle tracking result of the above two methods in the sensorless drive system,the position error was estimated.Then the estimated position error was applied to correct the motor mathematical model for the high-accuracy tracking of the optimal current vector angle.Finally,the effectiveness of the proposed method was verified on the 2.2 kW interior PMSM(IPMSM)experimental platform.