基于动态相位校正的伺服系统电流环设计

Design of Current Control Loop for Servo System Based on Dynamic Phase Correction

在传统的永磁同步电机伺服控制系统电流环设计中,由于系统中起关键作用的参数为电压矢量的幅值和相角,交轴电流、直轴电流组成的两个闭环独立给定电压矢量在d-q坐标轴上的分量,只是一种间接的控制。此外,在特定情况下,两个分量间的独立性和控制算法的间接性使得对幅值和相角的控制作用相互抵消,进而还会削弱系统的动态性能。文章提出了一种基于动态相位校正的控制方法,实现了对参数的直接控制,并设计了模糊控制器来控制电压矢量的相位,可以有效地避免这一问题。

In the traditional design of current control loop for the permanent magnet synchronous motor servo system, two components on the d-q coordinate against the voltage vector supplied by two dependent close loops composed by quadratureaxis and directaxis current are only a kind of indirect control since the main effective parameters are voltage vector and phase angle. In some special condition, the independence between two components and indirect nature＇ of the control calculation brings up with incompatibility between the phase angle control and amplitude control, thus, to influence the dynamic performance of the system. A new control method based upon phase position correction dynamically was presented to realize the direct control to the parameters while a fuzzy control was designed to control the phase position of the voltage vector, effectively avoiding the occurrence of this problem. Simulation and experiment results showed the validity of this control method.