Feedback Control of Fractional PIλDµ for DC/DC Buck Converters

To deal with the problem of ripple and instability occurred in the class DC Buck converter when its load and component parameters change or the feedback loop is disturbed by the outside, a fractional order controller(FOC) is designed in this paper to realize high performance control of Buck circuits. Compared with the traditional PID controller, this controller introduces two fractional parameters λ and μ. Combining fractional order theory with PID controller, the fractional PID feedback loop is established to improve the control effect of the system on the output voltage. The fractional order control strategy is simulated. Simulation results show that this fractional order control has the advantages of better dynamic and steady-state performance, stronger anti-interference ability and stronger robustness.