Energy Storage System and Multilevel Inverter for Electric Vehicles Applicat
Keywords:
Multilevel Inverter, PWM, Boost Factor, Electric VehiclesAbstract
A multilevel inverter is a power electronic device that is used for high-voltage and high-power applications because of its characteristic of generating a sinusoidal voltage based on several DC voltage levels. It provides good quality output resulting in lower harmonic distortion in the output. This topology is designed based on switched-capacitor voltage pump techniques, and the number of output voltage levels is defined by the number of switched-capacitor cells cascaded. Only one DC voltage source is needed, and the problem of voltage balancing across the capacitors is also avoided. A small input voltage can be used to generate a boosted output voltage by switching the capacitors in parallel and in series. The basic MLIs are cascaded H-bridge (CHB), neutral point clamped, and flying capacitor inverters. In addition, the inverters inherit various advantages of the original structure, such as a high boost factor of 6, self-balanced capacitor voltages, and reduced voltage ripples. Circuit description, operation principle, hybrid PWM modulation, and capacitor voltage ripples are analyzed. The capacitor voltages are self-balanced as they are connected in parallel with the input voltage source for several instances in every fundamental cycle.
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