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PI controller tuning of the closed-loop system is an important and very experience dependent work. Taking BUCK converter as an example, this paper introduces the use of three methods about tuning a PI controller in MATLAB, including importing a plant mathematical model from workspace, using a Simulink system identification model with simulated I/O data and using a plant frequency response model near bandwidth. The control effects of the three turning methods are verified by Simulink simulation models, and voltage disturbance and load disturbance are added to test the robustness of the system. According to the simulation results, the performance of the three turning methods of PI controller parameters is compared. The results show that for different control objects, it is feasible to choose one of the three methods to tune the parameters of the PI controller.
Inspec keywords: load (electric); PI control; frequency response; PWM power convertors; closed loop systems
Subjects: Control system analysis and synthesis methods; Power convertors and power supplies to apparatus; Control of electric power systems