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

Abstract

Philosophers and industries have focused on designing 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, significant reverse recovery times, and voltage balancing issues. A modern asymmetrical multilevel 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 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 seven switches, three dc sources and three diodes and hence the volume, cost and driver circuit complexity is 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 integral for this research. The efficacy of this topology enhances the integration of renewable energy sources.

A stored energy-based control strategy to improve LVRT capability of HRES using PSO & WCA optimized DVR

“…In this method, the particle's state is continuously updated in the multi-dimensional search space until the particle reaches its ideal state. (Kumar et al, 2022) Various vectors are described as follows to mathematically define the PSO technique:…”

Design of an Optimized Asymmetric Multilevel Inverter with Reduced Components Using Newton‐Raphson Method and Particle Swarm Optimization

“…Multilevel inverters have made signifcant strides forward in recent times because of their ability to ofer maximum power output at afordable costs [16]. By including the harmonic profle in the IEEE-519 standard, multilevel inverter topologies remove the requirement for massive flters [17]. Electric motors may be guaranteed by lowering THD, dv/dt stress, and common-mode voltages [18].…”