基于无差拍电流预测控制的永磁同步电机谐波电流抑制策略

Harmonic Current Suppression Strategy for Permanent Magnet Synchronous Motor Based on Deadbeat Current Prediction Control

为解决永磁同步电机在运行过程中三相电流发生畸变、谐波含量高等问题,该文提出一种新的谐波电流抑制方法。首先分析了各次谐波电流在对应同步旋转坐标系下的表现形式,并在此基础之上设计了闭环谐波电流检测系统对谐波电流进行提取,最后采用无差拍电流预测控制策略生成补偿电压用于抑制谐波电流。仿真与实验结果表明,该方法可以有效抑制谐波电流,提高电机三相电流的正弦度,并且具有计算简单、易于实现的特点。

In order to solve the problems of three-phase current distortion and high harmonic content during the operation of permanent magnet synchronous motors,this paper proposes a new harmonic current suppression method.Firstly,the expression of each harmonic current in the corresponding synchronous rotating coordinate system was analyzed.Then,a closed-loop harmonic current detection system was designed to extract the harmonic current.Finally,the deadbeat current prediction control strategy was used to suppress harmonic current by generating the compensation voltage.Simulation and experimental results show that this method can effectively suppress the harmonic current and improve the motor’s sinusoidal degree of the three-phase current.Moreover,the calculation is simple and easy to implement.