Disturbance Observer based Discrete-Time Constrained Anti-Windup Control of Full-Bridge DC-DC Converter

摘要

This paper presents a discrete-time disturbance observer based control scheme for a phase-shift full-bridge (PSFB) DC DC converter in presence of physical constraints. In this single-input, single-output (SISO) plant, the main control objective is to regulate the output voltage to a desired reference while respecting multiple operational constraints including the nonlinear constraint of peak switch current. It is shown that the proposed disturbance observer based control architecture offers a stable implementation without marginally stable dynamics, and constraint handling with intrinsic anti-windup mechanism. It is also shown that the proposed approach offers a fully decoupled observer and controller implementation, which results in a convenient design process. A complete implementation process of the proposed control is discussed in detail. The effectiveness of the proposed control scheme is tested on PSFB DC DC converter virtual hardware in MATLAB/Simulink, and results for different test scenarios are included.