Cascaded Multilevel Inverter Based On Switched Capacitor For High Frequency AC Power distribution System

Abstract

Compared to low- or medium-frequency distribution, transmission frequencies that are higher show greater benefits in various power applications. In a high-frequency alternating current (HFAC) power distribution system (PDS), the high-frequency inverter acts as the source side. A high-frequency inverter with an easy-to-understand modulation scheme and a simple circuit architecture is difficult to achieve, however. This work presents a new cascaded multilevel inverter that uses switched- capacitor frontends and H-Bridge backends. The switching capacitor frontend expands the voltage range by converting series and parallel connections. As the number of voltage levels increases, the output harmonics and component counting may be greatly decreased. An analog implementation of symmetrical triangular waveform modulation is suggested, which has a low modulation frequency in comparison to conventional multicarrier modulation. Topics covered include topology augmentation, symmetrical modulation, operation cycles, parameter determination, and Fourier analysis. In order to compare the results of the simulation with the prototype, a Matlab/Simulink system is set up with a rated output frequency of 25 kHz.