基于复域改进的IPMSM内模电流解耦控制

An Improved IPMSM Internal Model Current Decoupling Control Based on Complex Domain

分析了交、直轴电流耦合对IPMSM调速系统转矩输出能力的影响,在考虑电机电气参数变化的基础上,采用内模控制进行电流环解耦,并在复域中对比分析了传统反馈解耦和内模解耦的抗参数扰动能力。针对内模控制系统进入稳态前出现的震荡现象,提出一种增加虚拟电阻的改进内模控制方法,仿真表明能有效实现交、直轴电流解耦,并提高系统的鲁棒能力。

This paper analyzes the effect that alternate and direct shaft currents produce upon the torque output capacity of the IPMSM speed regulating system. Under consideration of variations of the electrical parameters of the motor, internal model control is adopted to achieve current loop decoupling. In the complex domain, a comparative analysis is made of the parameter disturbance resistance of the classical feedback decoupling and internal model decoupling. With respect to the oscillation occurring before the internal model control system enters its steady state, an improved internal model control is presented to add a virtual resistor. Simulation results indicate that this method can effectively realize alternate and direct shaft current decoupling and improve the robustness of the system as well.