基于固定开关频率的永磁同步电机预测电流控制

Predictive Current Control of Permanent Magnet Synchronous Motor Combined with Fixed Switching Frequency

为了实现高性能永磁同步电机控制,提出了一种基于固定开关频率的永磁同步电机预测电流控制策略。通过磁场定向原理设计了基于d-q轴电流的成本函数和对应约束,采用离散化的电机数学模型和迭代算法对最优电压矢量进行求解,计算结果由空间矢量调制生成固定开关频率的控制脉冲,实现电机驱动。新型控制方案和传统磁场定向控制方案的对比试验结果验证了新型控制方案的动态性能要明显优于传统控制策略。

To achieve high performance permanent magnet synchronous motor control,a new predictive current control of permanent magnet synchronous motor combined with magnetic field orientation was proposed. At first,cost function and the corresponding constraints of the controller were designed based on d-q axis current through the field oriented principle,and then the discrete motor mathematical model and the iterative algorithm were used for solving the optimal voltage vector,and the final calculation results were sent to space vector pulse wide modulation to realize the motor driven at fixed switching frequency. The comparative test results between the traditional control strategy and the new method show that the dynamic performance of the new control scheme is significantly better than that of the traditional control strategy.