A Novel Control Scheme Based on Exact Feedback Linearization Achieving Robust Constant Voltage for Boost Converter

Abstract

This paper presents a novel form of feedback linearization control (FBL) of boost-type DC/DC converter: to reach highly accurate output voltage control. Integral action has been inserted into the block diagram of the control scheme. The state-space model of the boost converter is highly nonlinear. Accordingly, the design procedure of the controller is more complex. The paper presents the state-space modeling of the boost converter and details the design procedure of the nonlinear FBL controller step by step. The main goal of this paper is to highlight the importance of the error integrator in the FBL control loop. The proposed method has been tested by a numerical example and compared with an existing and validated two-loop controller. Both the dynamical and steady-state behavior of the examined boost converter performed better than the reference system. The steady-state error of the output voltage is almost eliminated, while the dynamical error decreased to 5% in comparison to the two-loop controller.

State Feedback with Integral Control Circuit Design of DC-DC Buck-Boost Converter

“…Design procedure of control circuit has not been provided. [9][10][11][12][13] State-feedback control via pole placement…”

“…Feedback linearization methods have been discussed in [9][10][11][12][13] for dc-dc power converters. A feedback control law based on full feedback linearization has been introduced for the buck, boost, and buck-boost converters [9].…”

“…A feedback control law based on full feedback linearization has been introduced for the buck, boost, and buck-boost converters [9]. Feedback linearization has been presented to control the buck-boost power converter [10,11], boost converter [12], and modular multilevel converter-bidirectional dc-dc power converter [13]. However, the aforementioned research efforts fall short of introducing systematic design procedures for the practical implementation of feedback linearization control law.…”