Robust controller design for three-phase medium frequency power supply

摘要

According to uncertainties of the load and leakage inductance in the output transformer, this paper uses the μ analysis and synthesis method to design a robust controller for the three-phase medium frequency power supply. The controller not only enables the closed-loop system to do the non-static error tracking and to be asymptotic stability, but also is good in robustness and able to suppress the load disturbance. Through the comparison of the designed robust controller with the presently-used double loop PR, simulation results and 60kVA prototype experiment results show that the designed robust controller has advantages of simpler control structure, stronger anti-disturbance ability, faster dynamic performance, and that the whole closed-loop system is better in robust performance.