Enhancing Nine-Level Quadruple Boost Inverter Operation with Reduced Output Distortions

The distortion produced in the voltage waveform of the inverter hinders its operation at high power. To overcome this issue, this paper presents the modeling of the nine-level quadruple boost (NLQB) inverter and closed-loop control of the same using a proportional-integral (PI) controller. The single DCsourced NLQB inverter uses 10 insulated gate bipolar transistor switches and two switched capacitors. A cascaded PI controller is designed (for voltage and current control) in the aforementioned NLQB inverter to maintain its output voltage at a desirable level. Further, the performance of this inverter after employing a PI controller is studied with harmonic analysis using a fast Fourier transform. Compared with the open-loop operation of this NLQB inverter, the suggested cascaded PI-based closed-loop system produces lesser harmonics and total harmonic distortion.