Sliding‐mode variational structure study of Cuk converter based on target holographic feedback

Abstract

SummaryWith the rapid advancement of new energy sources, distributed power supplies have gained widespread adoption in DC microgrid systems. The stability of the DC‐DC converter, serving as the central component for energy transfer between the distributed power supply and the DC bus, holds significant importance in ensuring the overall system performance. Due to the intricate nature of real‐world operating conditions, the DC bus voltage is frequently subject to uncertainties such as fluctuations in distributed power supplies and random variations in loads. As a consequence, the reliability of DC‐DC converters faces escalating demands, making it challenging for conventional linear controllers to ensure consistent operation of DC‐DC converters across a broad range. This study focuses on addressing this issue by investigating the Cuk converter, which serves as a representative example of a single‐input multiple‐output system. The operating characteristics and control challenges of the Cuk converter are analyzed, and a nonlinear control strategy based on target holographic feedback is proposed to enhance the system's stability. Considering the non‐minimum phase characteristics of the Cuk converter and its inability to be linearized through exact feedback, a sliding mode variable structure control approach is introduced, utilizing target holographic feedback. Through simulation and experimental analysis, the effectiveness of the model and the theoretical analysis are validated.