THD optimization in 15-level asymmetric reduced switch count multilevel PV inverter using optimization algorithms

Abstract

Philosophers and industries have focused on the design of multilevel inverters, which use significantly fewer power switches and dc sources to achieve high power, low switching, and less harmonic output distortion for medium voltage applications. Even so, these multilevel inverters have some downsides like the use of many electronic components, electromagnetic interference (EMI), bulky, driver circuit complexity, large reverse recovery times, and voltage balancing issues. A modern asymmetrical multi-level inverter with fewer switches and drivers than standard topology is introduced in this article. The powerful analogy addresses traditional inverter topologies of a similar structure. The proposed MLI is relatively simple in design and easy to extend for many output levels. The proposed design of MLI is implemented for 15 level output with precise and high-quality near sinusoidal waveform using 7 switches, 3 dc sources, and 3 diodes, and hence the volume, cost, and driver circuit complexity are considerably reduced. The novelty in the proposed topology is that reduced ON state semiconductor switching devices. The output of the MLI is evaluated with the parameter of total harmonic distortion (THD). To minimize the THD, optimization algorithms such as GA, PSO, WOA, and HHA were implemented at fundamental switching PWM control method. The comparative analysis of these algorithms on proposed inverter performance is an integral part of this research. The efficacy of this topology enhances the integration of renewable energy sources.