Application of factional — Order PIλ controller to control 3-phase PWM rectifier

With the advantages of the conventional PI controller in both relatively impressed results in control and easy choice of parameters, the use of conventional PI controller applied in 3-phase voltage rectifier control systems as well as in other control systems is the optimal choice when computer technology is still underdeveloped. This controller has several drawbacks as relative accuracy of designed parameters, sensitive with changes of parameters, high overshoot, relatively high harmonic current components. The use of PI fractional controller rather than a conventional PI is proposed in this paper. The better result of PI fractional controller control in not only power quality and DC voltage control but also reducing of high-order harmonics and improving power factor of the system proved by simulations and experiments illustrates the significant meaning in both literature and practical application.