Optimized offset modulation technique for three-phase DC-AC boost- converter

This paper introduces an efficient modulation technique for three-phase DC-AC boost converter. Various modulation scheme have already been developed fore conventional three-phased boost converter such as sinusoidal pwm (spwm) and space vector modulation (svm). There are two main considerations in designing power electronic converter; small-size simple topology and applicable control algorithm. This paper starts with an ideal differential boost-inverter, suggesting a simple formulation of pulse widths for generation of sinusoidal waveform. Despite some improvements on the waveforms, still the output voltage is distorted. It is notable that even PI-controllers followed by various modulating techniques still lead to distorted output voltage because of the non-linear structure of conver. Further, to overcome the state issue an optimized offset modulation technique is defined for conventional six-pulse two-level three-phase boost-converter. Furthermore, practical verification are taken place on implemented 1 kVA boost-converters in order to confirm the proposed technique as well as theoretical analysis and simulations. Experiments and simulations both verify the suggested optimized modulation technique.