volume | PIER Journals

Abstract

To address the issue of large inductor current ripple in the existing finite switching sequence model predictive control (FSS-MPC) strategy for quasi-Z-source inverters (qZSI), an improved switching sequence model predictive control strategy is proposed. First, the switching sequences and inductor current ripple characteristics of the existing strategy are analyzed. Then, the voltage vectors are rearranged, and eight switching sequences with shoot-through vectors are designed within one sector. Next, the duty cycles of the voltage vectors are calculated based on the inverse relationship between the duty cycle and the cost function value. Additionally, a weighting coefficient for switching times is introduced into the cost function. Finally, simulations and experiments are conducted to compare the proposed method with the conventional FSS-MPC strategy. The results verify the feasibility and effectiveness of the proposed control strategy.

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Dr. Yang Zhang

Dr. Yuwei Meng

Dr. Xiuhai Yang

Dr. Dingai Zhong

Dr. Zhun Cheng