IECON 2000 26th Annual Conference of the IEEE Industrial Electronics Society

Multilevel converters are used in various industrial, commercial, and domestic applications such as grid-connected systems, rectifiers, active power filter, UPS, electrical drives, etc. This type of converter makes use of abundant number of power semiconductor devices for dividing a fraction of DC voltage and generating more voltage levels. Because of high number of semiconductor devices, multilevel converters have high nonlinear behavior which demands an advanced control technique to fulfill the control objectives. In recent years, it has been deeply investigated that the hybrid control technique are the suitable alternative compared to the conventional strategies to control multilevel converters in industrial applications particularly when they are employed grid-connected mode of operation. Various hybrid modulation techniques have been presented which are comparative in different aspects with the conventional pure techniques in terms of better current/voltage harmonic profile, lower switching frequency, excellent capacitor self-voltage balancing