改进的单轴弱磁控制算法的仿真研究

Simulation study of improved single axis weak magnetic control algorithm

基于弱磁控制系统中出现的诸如控制滞后、电流环调节难以退出饱和等问题,设计了一种改进单轴弱磁控制方法。首先分析了改进的单轴弱磁控制的原理;然后,利用电压极限值的方法计算推导了交轴给定电压值,并提出了电机在弱磁区和恒转矩区域之间来回切换的条件;接下来按照电压矢量大小将SVPWM划分为3个不同调制区域,并分别设计了相应的控制算法。最后的仿真结果表明,改进的单轴弱磁控制方法具有调节稳定、电流波动小、退饱和能力强等特点。

In order to solve the problem that the control lagged in the weak magnetic control system and the current loop adjustment was difficult to withdraw from the saturation problem,an improved single axis weak magnetic control method was proposed.First,the improved principle of single axis magnetic flux control was analyzed.Then the given value of the AC axis voltage was calculated by the method of the voltage limit value,and the condition for the motor to switch back and forth between the weak magnetic zone and the constant torque zone was put forward.Next the SVPWM was divided into three different modulation regions according to the voltage vector size,and the corresponding control algorithms were designed respectively.The final simulation results showed that the improved single axis magnetic flux control method has the characteristics of stable adjustment,small current fluctuation and strong desaturation ability.