Observer-based controller for current mode control of an interleaved boost converter

Authors: SHENBAGA LAKSHMI, SREE RENGA RAJA

Abstract: A state feedback control method for an interleaved boost power converter is designed, which, in turn, can achieve interleaved current sharing among parallel-connected converters. The state feedback control in the continuous time domain is derived using the pole placement technique and linear quadratic optimal method. The load estimator is designed by deriving a full-order state observer to ensure the robustness and optimality of the state feedback control and an observer-based controller (control law plus full-order state observer) is designed using the separation principle. The adopted control strategies achieve effective output voltage regulation, good dynamic stability, and reject disturbances. Extensive simulation is carried out and the results are illustrated.

Keywords: Control law, full-order state observer, interleaved boost converter, pole placement, Riccati matrix, separation principle

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