X-Type Step-Up Multi-Level Inverter with Reduced Component Count Based on Switched-Capacitor Concept

Abstract

This paper aims to present a novel switched-capacitor multi-level inverter. The presented structure generates a staircase near sinusoidal AC voltage by using a single DC source and a few capacitors to step-up the input voltage. The nearest level control (NLC) strategy is used to control the operation of the converter. These switching states are designed in a way that they always ensure the self-voltage balancing of the capacitors. Low switching frequency, simple control, and inherent bipolar output are some of the advantages of the presented inverter. Compared to other existing topologies, the structure requires fewer circuit elements. Bi-directional power flow ability of the proposed topology, facilitates the operation of the circuit under wide range of load behaviors which makes it applicable in most industries. Besides, a 13-level laboratory prototype is implemented to realize and affirm the efficacy of the MATLAB Simulink model under different load conditions. The simulation and experimental results accredit the appropriate performance of the converter. Finally, a theoretical efficiency of 92.73% is reached.

Fault-Tolerant Operation Strategy for Reliability Improvement of a Switched-Capacitor Multilevel Inverter

“…Where, Voff-state and Ion-state are off-state voltage and switch current when the switch becomes fully turned on, respectively [25]. Thus, the total switching loss of the circuit (Psw), which is the sum of turn-on and turn-off losses, is calculated by (5):…”

An Asymmetric Switched-Capacitor Multicell Inverter With Low Number of DC Source and Voltage Stress for Renewable Energy Sources

“…Several switched-capacitor MLI structures have been proposed to boost input voltage and remove the H-bridge module in order to decrease the voltage stress of the switches, [14]- [18]. [14]- [17] generate 13 voltage levels using two DC sources, whereas [18] uses a single DC source.…”

“…Several switched-capacitor MLI structures have been proposed to boost input voltage and remove the H-bridge module in order to decrease the voltage stress of the switches, [14]- [18]. [14]- [17] generate 13 voltage levels using two DC sources, whereas [18] uses a single DC source. Although [18] requires a low DC source count, it uses a high number of power switches, which makes this topology have high power losses.…”

“…[14]- [17] generate 13 voltage levels using two DC sources, whereas [18] uses a single DC source. Although [18] requires a low DC source count, it uses a high number of power switches, which makes this topology have high power losses. Besides, [14], [16]- [18] use two or more capacitors, which cause higher capacitor power losses.…”

Experimental Validation of Metaheuristic and Conventional Modulation, and Hysteresis Control of the Dual Boost Nine-Level Inverter

“…Whereas, in NPC and FC inverters, with the increase in number of voltage levels, the required number of series connected clamping diode and flying capacitors increases manyfold [7]. Researchers have overcome the above issues by obtaining either the hybrid topologies from the standard classical topologies [8][9][10][11] or by developing new switched capacitor topologies [12][13][14][15].…”