永磁同步电机FOC控制下相电流直流分量影响与抑制策略研究

Research on the influence and suppression strategy of phase current DC component under permanent magnet synchronous motor FOC control

永磁同步电机在矢量控制时需要对电机相电流进行采样,采样过程中参考电平波动等诸多因素都会造成相电流中包含直流分量,此外直流电压注入法等永磁同步电机参数在线估计方法,也会在相电流中引入直流分量。本文详细分析了不同情况下直流分量的产生机理,研究了直流分量对控制效果、转矩脉动、效率等性能的影响。提出一种可滤除三相交流信号中直流分量的数据处理方法,该方法对不同因素引入的直流分量均能起到良好的抑制作用,从而增加控制稳定性,降低转矩波动,仿真和应用实践验证了算法有效性。

Permanent magnet synchronous motors require sampling of the motor phase current during vector control.During the sampling process,many factors such as reference level fluctuations can cause the phase current to contain DC components.In addition,online parameter estimation methods such as DC voltage injection also introduce DC components into the phase current.This article provides a detailed analysis of the generation mechanism of DC components in different situations,and investigates the impact of DC components on control effectiveness,torque ripple,efficiency,and other performance.Propose a data processing method that can filter out the DC component in three-phase AC signals.This method can effectively suppress the DC component introduced by different factors,thereby increasing control stability and improving the efficiency of the motor system.Simulation and application practice have verified the effectiveness of the algorithm.