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Multilevel converters are used in medium voltage high power applications. In this field, switching losses are an important efficiency issue due to long term operation costs. Previous works have centered the analysis in comparing different topologies or semiconductors in relation to switching losses. However, switching loses are closely related to the modulation method employed to control the converter...
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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