低开关频率下非理想因素对PMSM PSVI控制效果的影响分析

Analysis of the Influence of Non-ideal Factors on the Control Effect of PSVI for PMSM Under Low Switching Frequency

高频脉振电压注入(PSVI)法由于动态性能更快、转矩脉动更小等优势,被广泛应用于永磁同步电机(PMSM)低速范围的无位置传感器控制中。低开关频率下,由于系统延时更大,特殊的控制架构造成的高频相位更新滞后以及滤波器截止频率较低带来的相位延时增大等,传统高频脉振电压注入法的动稳态性能受到严重影响。针对上述问题,在详细分析滤波器相位延迟和低开关频率下高频脉振电压相位更新不及时对转子位置估算的影响的基础上,分别提出了对不同非理想因素的补偿方案。最后对上述非理想因素的影响及补偿方案进行了仿真验证,仿真结果表明,所提解决方案能有效减小转子位置估算误差。

Due to the advantages of faster dynamic performance and smaller torque ripple,high frequency pulse voltage injection(PSVI)is widely used in sensorless control of permanent magnet synchronous motor(PMSM)at low-speed range.Under low switching frequency,the dynamic and steady performance of the traditional high frequency pulse voltage injection method is seriously affected due to the larger system delay,the high-frequency phase update delay caused by the special control structure,and the increase of the phase delay caused by the lower cut-off frequency of the filter.In view of the above problems,compensation schemes for different non-ideal factors were proposed based on the detailed analysis of the influence of the filter phase delay and the delayed phase update of high frequency pulse voltage under low switching frequency on the rotor position estimation.Finally,the influence of the above non-ideal factors and the compensation scheme were simulated and verified.The simulation results show that the proposed solution can effectively reduce the rotor position estimation error.