无模型功率解耦控制在带降压变换器的单相整流器中的应用

This paper proposes a model-free control method for a single-phase buck power decoupling ac/dc system. It tackles performance degradation caused by the ripple current coupling between the single-phase rectifier (SPR) and the buck decoupling circuit (BDC). The coupling mechanism between both is analyzed through the dc-link ripple current relationship based on the organized mathematical moedl of system and a novel ultra-local model (ULM) for the system is established. Next, based on the novel ULM, a model-free predictive current control (MFPCC) strategy for SPR and a model-free power decoupling control (MFPDC) strategy for BDC are designed respectively. Then, an extended sliding mode observer (ESMO) is then designed to estimate the unknown parts of the novel ULM in the two control strategies, compensating for errors induced by dynamic changes of the system. As a result, the proposed method alleviates the impact of converter coupling on system control performance. Finally, experimental results validate the effectiveness of the proposed approach.