A Novel Eleven-Level Quintuple Boost Switched-Capacitor Inverter with Self-Balancing Capability
Аннотация
The integration of low-voltage renewable energy sources into the grid demands inverter topologies with high voltage gain and efficiency, particularly in transformerless configurations. Switched-capacitor multilevel inverters (SCMLIs) have emerged as a promising solution due to their ability to provide high-quality AC output with reduced power losses. However, existing designs often face challenges related to capacitor voltage balancing, high component count, and excessive switch voltage stress. This paper introduces a novel 11-level switched-capacitor inverter topology utilizing a single DC source, 12 switches, 4 capacitors, and 4 diodes, achieving a fivefold voltage gain while ensuring self-balancing of capacitor voltages without the need for additional sensors or auxiliary circuits. The proposed inverter operates with the Optimum Nearest Level Modulation (ONLM) technique, minimizing switching losses and enhancing overall efficiency. Simulation results using MATLAB/Simulink demonstrate the inverter’s performance, with a Total Harmonic Distortion (THD) of 7.34% without filtering, which is significantly reduced to 0.32% with the application of an LCL filter. The inverter exhibits stable operation under dynamic load variations, confirming its adaptability for real-world applications. A comparative analysis against conventional multilevel inverters further underscores its superior efficiency, reduced component count, and improved voltage quality, making it a viable and cost-effective solution for renewable energy systems, microgrids, and high-power applications.