Abstract
As a high-performance variable frequency control technology, vector control has been widely used in the field of AC speed regulation. However, the cross-coupling potential of the induction motor after the vector transformation still affects the system performance. Therefore, the method is studied in which stator current is decoupled to excitation component and torque component using internal model control, and the internal model decoupling stator current controller is designed based on rotor field orientation. The simulation model of induction motor vector control system based on internal model decoupling is constructed with Matlab/Simulink. The simulation result shows that the internal model controller is superior to the traditional PI controller in disturbance-rejection performance and robustness.
Highlights
Induction motor is a high-order, multi-variable, and strongly-coupled nonlinear object
Feedforward decoupling method can only be fully decoupled while the reference value is exactly same as the actual stator current [2]
The simulation results show that the disturbance-rejection and Robustness of internal model controller is better than PI controller
Summary
Induction motor is a high-order, multi-variable, and strongly-coupled nonlinear object. In the field of AC speed regulation, researchers often use the adjustment method of traditional PI This method often has a contradiction between the rapidity and overshoot of the system when the dynamic performance requirements are high. The internal model control has high accuracy which does not require the mathematical model of the controlled object, and it can dynamically follow the given signal and eliminate the influence of unmeasured interference on the system. This control strategy has a simple structure, easy in implementation and easy in setting of parameters [10]. The simulation results show that the disturbance-rejection and Robustness of internal model controller is better than PI controller
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