Seventeen-level Inverter Based on Switched-capacitor and Flying-capacitor
To reduce the number of components in high-level switched-capacitor multilevel inverters,this paper proposes a 17-level inverter based on switched-capacitor(SC)and flying-capacitor(FC)technologies.Combining the working principle of the inverter,the paper designs the corresponding modulation and voltage balance strategy,as well as optimizes the key circuit parameters,analyzes and designs the capacitance of SC and FC.The proposed inverter is composed of an SC voltage boost unit and a T-type FC unit.Three capacitors are used to achieve 17 output levels and a voltage gain of 2,and it is powered by a DC voltage source.Compared with other 17-level inverters,the proposed inverter has a simpler structure,the absence of an H-bridge,and it has advantages in terms of the number of transistors and capacitors,as well as the standing voltage for transistors.Finally,the steady-state and dynamic performance of the inverter are verified by experiments,and simulations.The results show that the proposed topologies have a high conversion efficiency,up to 98.4％in the experimental measurement range,and also have a good grid-connected performance.
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