A closed-loop control strategy based on a combination of linear self-disturbance rejection and proportional integral control was designed to address the resonance phenomenon caused by high-frequency resonance spikes in the VIENNA rectifier system.Based on the circuit topology model of a single VIENNA rectifier,a mathematical model of a single VIENNA rectifier in a two-phase rotating coordinate system was established,and the mechanism that caused resonance phenomenon of the VIENNA rectifier was analyzed.At the same time,a two degree of freedom linear self-disturbance rejection control was designed to control the second-order link in the system,and proportional integral control was used to control the first-order system,thereby forming an improved linear self-disturbance rejection and dual closed-loop control strategy;finally,a parallel system of multiple VIENNA rectifiers was built on the MATLAB/Simulink platform,and the experimental comparisons were made between proportional integral control and improved linear active disturbance rejection control.The results show that the improved linear auto disturbance rejection not only has better resonance suppression ability,but also a harmonic distortion rate of only 0.75％,which improves the stability and robustness of multiple VIENNA rectifiers.
关键词
多VIENNA整流器并联系统/谐振现象/线性自抗扰/比例积分
Key words
multiple VIENNA rectifier parallel system/resonance phenomenon/linear auto disturbance rejection/proportional integral
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