سال انتشار: ۱۳۸۸
محل انتشار: اولین کنفرانس بین المللی الکترونیک قدرت و سیستم های درایو
تعداد صفحات: ۶
Saradarzadeh – School of Electrical and Computer Engineering, University of Tehran., Tehran, Iran
Farhangi – School of Electrical and Computer Engineering, University of Tehran., Tehran, Iran
Schanen – Laboratoire d’Electrotechnique de Grenoble, CNRS UMR 5529 INPG/UJF, Grenoble, France
Jeannin – Laboratoire d’Electrotechnique de Grenoble, CNRS UMR 5529 INPG/UJF, Grenoble, France
In this paper a new method to balance the DC bus voltage of cascaded H-bridge converters is proposed. This balancing algorithm needs the DC capacitor voltages and the converter branch current which are commonly used in all multilevel cascaded H-bridge topologies. The balancing method applies at the innerest level of control system regardless of the main control method and PWM strategy. The voltage balancing procedure swaps the output voltage of each H-bridge cell in order to stabilize the DC bus voltages and provide the required output voltage. A fuzzy logic control method is used to apply the swapping in order to keep the switching frequency almost constant. The simulation results for different kinds of PWM strategy show the ability of this method to balance the DC bus voltages.