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Current control and capacitor balancing for 4-leg NPC converters using finite set model predictive control

In this paper control systems suitable for a 4-leg NPC converter are discussed. The proposed control methodology is based on a finite set model predictive control. A theoretical analysis of the strategy, including tracking of non-sinusoidal currents and reduction of the switching frequency, is presented in this paper and experimental results, obtained with a 3 kw experimental prototype are discussed.