Robust Speed Regulation for Converter‐Fed Motors via a Predictive Observer‐Based Control Approach

Abstract

This paper proposes a novel predictive observer‐based control (PO‐BC) scheme to address the speed regulation problem of a DC‐DC converter‐fed DC motor, which takes full account of system delays and disturbances. Unlike conventional cascaded control structures, the proposed approach employs a holistic fourth‐order model that explicitly accounts for the cumulative time delays inherent in the system. To counteract the destabilizing effects of these delays, a specialized predictive observer is developed to concurrently reconstruct system states and lumped disturbances. Based on the predicted information, a composite control law is synthesized to achieve active delay compensation and robust disturbance rejection. A significant advantage of the proposed scheme is its streamlined, noncascaded architecture, which requires only partial system states while maintaining high regulation accuracy. Rigorous theoretical analysis is conducted to demonstrate the stability of the closed‐loop system. Finally, comprehensive experimental results are presented to validate the effectiveness and superiority of the proposed PO‐BC scheme.