Abstract
With the development of power electronics, larger capacity is required. Multilevel inverter technology has been widely applied in high power equipment due to its advantages, including low voltage stress on power switches, low harmonics and EMI. However, when number of level increases, the multilevel topology and control method will be complicated, which will decrease the inverter’s reliability. High capacity is the main development direction of power electronics technology in the future, multilevel converter technology is the key to realize high voltage high capacity, and the main circuit topology of multilevel conversion device is the focus of research. Multilevel converter technology becomes the key to realize high voltage and large capacity. With the increase of level number, the complexity of circuit topology and control increases, which reduces the reliability of the converter system.The article analyzes in detail several specific main circuit topology structures of multilevel conversion devices, points out the advantages and disadvantages of several topologies, analyzes and studies the reliability of cascaded multilevel conversion devices, and carries out Carrier Phase Shift Pulse Width Modulation(CPSPWM)Simulation analysis.
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