多工况不同控制策略下表贴式永磁同步电机供电电流谐波分析

为了深入掌握不同控制策略下供电电流谐波对表贴式永磁同步电机性能的影响，本文在比较不同控制策略原理的基础上完成了PI和滑模控制器的参数整定，基于同一表贴式永磁同步电机建立了不同控制策略下的Matlab/Simulink仿真模型，对不同工况下表贴式永磁同步电机的供电电流分别进行谐波分析，分析了多工况下供电电流谐波的分布情况，发现不同控制策略产生的供电电流在空载以及高速运行状态下均在SVPWM开关频率附近有幅值较大的谐波分量。为了降低供电电流总谐波失真(THD),提出自适应开关频率法，使不同工况下供电电流THD平均下降30%左右，同时降低了IGBT的开关损耗并延长其使用寿命。最后对多工况下不同控制策略做出评价，为进一步研究供电电流谐波对永磁同步电机的温升和振动噪声的影响打下基础。

Harmonic Analysis of the Suppling Current of Surface-mounted Permanent Magnet Synchronous Motor Under Different Control Strategies of Multiple Operating Conditions

In order to understand the impact of suppling current harmonic s on the performance of surface-mounted permanent magnet synchro nous motor (SPMSM) under different control strategies, this paper completed the parameter tuning of PI and sliding mode controllers based on the comparison of the principles of different control strategies, and established MATLAB/Simulink simulation models of different control strategies under a same SPMSM model, the harmonic analysis of the power supply current of the surface-mounted permanent magnet synchro nous motor under different working conditions is carri ed out. and the harmonic distribution of the power supply current under multiple working conditions are summarized. It is found that the power supply current generated by different control strategies has relatively large harmonics near the SVPWM switching frequency under no-load and high-speed operation. In order to reduce the total harmonic distortion (THD) of the suppling current, an adaptive switching frequency method is proposed through simulation verification, which could reduce the THD of the supply current under different conditions by an average of about 30%, and also reduce the switching loss of the IGBT and extend its us ing life. Finally, different control strategies were evaluated under multiple operating conditions , and lays the foundation for further research on the influence of power suppl ing current harmonics on the temperature rise and vibration and noise of permanent magnet synchronous motors.