Journal
2021 IEEE 22ND WORKSHOP ON CONTROL AND MODELLING OF POWER ELECTRONICS (COMPEL)
Volume -, Issue -, Pages -Publisher
IEEE
DOI: 10.1109/COMPEL52922.2021.9646046
Keywords
Stacked multicell converter (SMC); multilevel converter; capacitor voltage ratio; model predictive control (MPC); switching state redundancy
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The paper proposes a method for improving the output voltage resolution of the stacked multicell converter (SMC) by modifying the capacitor voltage ratios to increase the switching voltage level. Through the study, it is found that with reduced computational burden, the performance of a SMC constructed with three stacked subcells can be explored under different operation modes.
Owing to its symmetric and extendable circuit characteristics, the stacked multicell converter (SMC) can be configured to provide flexible voltage levels. Traditionally, achieving higher voltage levels of SMC requires extra stacked subcells resulting in extra device costs as well as power losses. To address this, modified capacitor voltage ratios of SMC for the improvement of output voltage resolution are proposed and studied in this paper. The motivation behind is to increase the switching voltage level of SMC meanwhile limiting the numbers of semiconductor devices and flying capacitors (FC5). By applying a model predictive control (MPC) algorithm with reduced computational burden, a SMC constructed with three stacked subcells is investigated under the seven/nine/eleven-level operation modes.
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