永磁同步电机无差拍电流预测控制

Deadbeat Predictive Current Control of PMSM

针对永磁同步电机(permanent magnet synchronous motor,PMSM)数字控制下的精度和延时等问题,提出一种无差拍电流预测控制。给出同步旋转坐标系下永磁同步电机数学模型,考虑信号采集的延时和处理器计算延时,进行2次电流预测,并在Matlab/Simulink环境下建立控制系统电流环进行验证分析。结果表明:与比例积分(proportional intergral,PI)控制相比,电流环具有响应快、超调小的特点;与传统无差拍相比,电流环具有静态误差小的优点,并且速度环闭环后,PMSM控制系统具有良好的动、静态性能。

In order to solve the problems that permanent magnet synchronous motor(PMSM)digital control system has low precision and time delay,a deadbeat predictive current control algorithm is proposed.The control strategies of PMSM are mostly implemented in the digital domain by means of microcontrollers,DSP or FPGA,which means,there is a one sample delay between the instant the calculations for a new corrective action are started and the instant such action is effectively generated by the system,and it will affect the performance of current loop.Therefor the algorithm is proposed,considering the time delay bringing by the CPU,current sensor and position sensor.And a compensation of reference voltages at high speed is designed to avoid the static errors in current loop.Compared to the conventional PI control,the deadbeat predictive current control algorithm proves to be quick in dynamic response,less overshoot and low in static errors.