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Control of Dual Inverter with Power Losses Minimization Using SVPWM and Prediction with Extended Horizon

This paper introduces a novel control method for a dual voltage source converter. The proposed method is focused on equal redistribution of power losses among the semiconductor switching devices (IGBTs), which leads to better power utilization of the converter. The main disadvantage of the known control methods for the mentioned converter based on PWM is its unequal distribution of power losses among the IGBTs. Furhermore, the PWM based algorithms are usually fast but the switching sequences have to be strictly defined for defined control requirements. The algorithms based on predictive control fulfill multicriteria control objectives but they are usually computationally demanding, particularly for longer prediction horizons. The proposed method combines advantages of both categories of control aproaches as e.g. calculation speed and constant switching frequency of PWM and multicriteria model predictive control with longer prediction horizon. The paper presents theoretical description and power losses distribution model design. Theoretical assumptions are verified by an extensive simulation study.