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DC voltage control strategy for a five-level converter

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5 Author(s)
Ishida, T. ; Meiji Univ., Kawasaki, Japan ; Matsuse, K. ; Sugita, K. ; Lipei Huang
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This paper describes a control method for a three-phase five-level diode-clamp pulse width modulation (PWM) converter considering DC-link capacitor voltage balancing problem. The proposed control circuit uses multiband hysteresis comparators (MHCs) to simplify the control of the main circuit. The DC-link capacitor voltage balancing problem is solved by changing the shape of the MHC. The proposed method can (1) overcome voltage imbalance at the DC-link capacitors; (2) achieve a unity power factor; (3) generate nearly sinusoidal input currents; and (4) regenerate electric power back to the power system. Simulation and experimental results demonstrate the validity of the proposed method

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Power Electronics, IEEE Transactions on  (Volume:15 ,  Issue: 3 )