基于高频方波注入的IPMSM新型I/f控制策略

New I/f Control Method Based on High Frequency Square-Wave Signal Injection for IPMSM

针对传统的永磁同步电机I/f控制方法具有给定电流无法调节、系统效率低等缺点,课题组提出了一种改进的控制策略。将I/f控制方法与高频方波注入法相结合,并对转子位置角提取算法进行简化,通过对虚拟的δ轴电流处理获取虚拟轴系与实际轴系间的误差角θ_(err),省去了观测器/锁相环环节。此方法下,对电机的给定电流实现了闭环可控,提高了电机电流的使用率,改进了系统的控制效率,简化了复杂的信号处理运算与参数整定过程。最终通过实验结果证明,该方法在电机的启动至稳态、负载突变时均具有良好的控制性能。

Aiming at the shortcomings of the traditional PMSM I/f control strategy such as uncontrollable given current and low control efficiency,an improved control strategy was proposed.The high frequency square-wave injection method was combined with the I/f control method,and the rotor position angle extraction process was simplified.The error angle between the virtual coordinate system and the actual coordinate system was obtained by processing the virtualδ-axis current,and the observer/PLL link was eliminated.Under this method,the closed-loop control of the given current of the motor was realized,the utilization rate of the motor current was improved,the control efficiency of the system was improved,and the complex signal processing operation and parameter setting process were simplified.The experimental results show that this method has good control performance from the startup to the steady state of the motor and the load torque sudden change.