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Z-source inverter and traditional two-stage buck-boost inverter are compared with respect to the voltage stress and maximum current stress of semiconductor devices and the inverter efficiency in grid-tied renewable energy generation application. The operation principles of the two inverters are introduced firstly, considering the two different PWM strategies used in Z-source inverter. Based on the...
The paper presents a new modulation strategy for cascaded H-bridge inverters which allows easy integration of device specific safety features like IGCT burst capability monitoring. It is compared to PWM using a simulation model of an unusual configuration for a 10 kV medium voltage inverter using just three cascaded cells per phase. The general structure of the cascaded H-bridge inverter and key data...
An analysis of the efficiency of AC/DC/AC diode-clamped multilevel converters is presented, where commanded and suitable variations of the DC-link voltages are proposed in order to decrease the energy losses. The study is carried out also aiming at the correct DC-link capacitor voltage balance, obtained with additional chopper stages together with a new PWM technique, considering both inverter and...
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