Adaptive Order-Reduction Output-Feedback System for DC–DC Power Converters Using Feedback-Loop Intelligentification

The suggested multiloop output-feedback system for dc/dc power converters deals with changes in parameters and loads, as well as performance issues, by using advanced methods like constrained feedback-loop intelligentification and pole-zero cancelation (PZC)-based order reduction (OR). This study offers several key contributions: 1) a cascade-type model-free observer minimizes steady-state ripple in the output filtering error, thereby broadening the feasible operating region; 2) the resulting observer facilitates an OR adaptive inner loop system capable of exponentially stabilizing the output voltage derivative error; and 3) a nonlinear update rule introduces intelligence into the outer loop by ensuring a critically damped transfer function, which automatically adjusts feedback gain according to the operating conditions. A prototype 3-kW bi-directional power converter demonstrates the practical advantages of the proposed technique by the experimental comparison study.