Buck converter-based cascaded asymmetrical multilevel inverter with reduced components

Summary This paper presents a new structure for a quasi‐resonant switched capacitor multilevel inverter. This structure offers multiple features of the conventional multilevel structures. Moreover, regarding the provided output voltage levels, the proposed structure exploits a new quasi‐resonant basic module which helps to diminish circuit cost and complexity using fewer power components. In the proposed structure, the balancing of capacitors voltages is achieved by series and parallel connection with the voltage source and without the need to employ a complicated control system. In order to obtain higher voltage levels at the inverter ac side, a developed H‐bridge is used in which the basic module is extended horizontally in separate cells on either side. Through a quasi‐resonant inductor deployment in the basic module, current spikes of capacitors are filtered which overwhelms decreasing of capacitor value and also lengthening the capacitor lifetime besides decreasing electromagnetic interference (EMI). Coupled with extensive simulation studies, experimental analyses are conducted to validate the performance of the proposed 17‐level inverter.

Section: Introductionmentioning

confidence: 99%

A new quasi‐resonant switched capacitor multilevel inverter with the self‐voltage balancing capability

Sabour

Nazarpour

Golshannavaz

et al. 2020

“…Furthermore, many multilevel inverter topologies present redundancies, as shown in Rech and Pinheiro . Using asymmetrical source configurations can reduce the redundancies allowing the inverter to reach a higher number of voltage levels without increasing the number of switches . Even though the SSPS topology can use asymmetric power supplies, it was not studied or mentioned in the literature.…”

Section: Introductionmentioning

confidence: 99%

A novel asymmetrical inverter proposal based on switched series/parallel inverter

Benmerabet

Talha

Berkouk

2019

Summary Switched series‐parallel sources (SSPS) inverter is a multilevel inverter presented in 2009 that offers great flexibility. Multilevel inverters are used to reduce the voltage stress and/or to produce AC current with low total harmonic distortion (THD). In this paper, our aim is to further improve it by reducing the power losses and switches count. Thus, a new arrangement of SSPS basic units that reduce the power losses is presented. On the basis of asymmetrical sources configurations and switched capacitors, two SSPS topologies with binary and trinary asymmetrical sources configuration are proposed. This helps to reduce the redundancies and the number of required switches for a defined number of steps. In this study, an analysis based on simulations and experimental results of a single‐phase 31‐level inverter and another of a 17‐level inverter are presented.

“…Multilevel inverters (MLIs) have become popular in medium‐voltage, high‐power, and renewable energy applications because of their ability to work at higher switching frequencies while restraining the dv/dt stresses . Moreover, they generate output voltage with lesser harmonics and thus reduces of filter requirement.…”

Section: Introductionmentioning

confidence: 99%

Selective harmonic elimination in hybrid cascaded multilevel inverter using modified whale optimization

Routray

Singh

Mahanty

2019

Summary This article presents a modified whale optimization (MWO) for harmonic mitigation in a three‐phase 11‐level hybrid cascaded multilevel inverter (HC‐MLI). The proposed MWO has improved rate of convergence as compared with conventional whale optimization (WO). This is achieved by improving the exploration‐exploitation feature of the conventional WO. Selective harmonic elimination–pulse width modulation technique is applied through MWO for generating the optimal switching angles of the HC‐MLI so as to eliminate the lower‐order harmonics such as 5th, 7th, 11th, and 13th from the output voltage. In the proposed MWO optimized HC‐MLI, capacitor voltage balance is made possible even at higher modulation indices using the available redundant switching states of HC‐MLI. The proposed work is useful where the HC‐MLI has to work at the low switching frequency and the conversion efficiency is of prime importance such as medium‐ and high‐power motor drives, static synchronous compensators, and active power filters. The performance of the proposed work is validated through simulation and experimentation on a 1.5‐kW prototype. The results obtained show that the MWO algorithm is more efficient and accurate than other reported algorithms such as genetic algorithm, particle swarm optimization, and WO in terms of performance, harmonic mitigation, and rate of convergence.