A LQR Design With Rejection of Disturbances and Robustness to Load Variations Applied to a Buck Converter

A LQR Design With Rejection of Disturbances and Robustness to Load Variations Applied to a Buck Converter

Blog Article

This work presents a state feedback controller suitable to regulate the output voltage of DC-DC buck converters operating under input voltage disturbances and load variations.First, a state space model of the plant is given and the performance requirements are presented, in terms of bounds on rejection of disturbances, 6-0 igora vibrance bounds on settling time of transient responses and robustness against load variations.Then, a control design procedure based on a linear quadratic regulator is proposed, having the following features: (a) an Hinf analysis condition to certify the bound on the rejection of disturbances, (b) an 3m speedglas 9002nc eigenvalue evaluation, to ensure the bound on the settling times of the slowest mode in the transient responses, and (c) a Lyapunov condition to ensure the robustness of the closed-loop system under load variations.The proposed design procedure produces control gains suitable for experimental implementation.For sake of comparison, a robust state feedback Hinf controller with pole location constraints is given, and show very large gains, not suitable for experimental implementation.

Practical results with the proposed controller are shown, illustrating the very good performance of the system operating under input disturbance and load variations.