三相电机电流不平衡补偿技术的研究

电机三相电流不平衡主要是由电机三相电感不平衡导致的。文章对不平衡电流提出了一种动态补偿方法。该方法检测电机三相电流,首先在每个电周期分别计算三相电流正、负半波峰值电流,然后计算不平衡量目标补偿电流和控制周期补偿电流,并换算成不平衡量补偿电压,最后在静止坐标系中完成补偿。实验表明,该算法可以快速补偿到可以接受的效果。

The unbalanced current of three-phase motor is mainly caused by the unbalance inductance of the three-phase motor.This paper presents a dynamic compensation method for unbalanced current.This method detects the three-phase current of the motor:Firstly,it calculates the positive and negative half wave peak currents of the three-phase current respectively in each electric cycle;then,it calculates the unbalance target compensation current and control cycle compensation current;and finally itconverts them into the unbalance compensation voltage,so as to complete the compensation in the static coordinate system.The experimental results show that the algorithm can quickly compensate the unbalanced current to an acceptable range.