A Cross Connected Asymmetrical Switched-Capacitor Multilevel Inverter

Multilevel inverters (MLIs) are used on a large scale because they have low total harmonic distortion (THD) and low voltage stress across the switches, making them ideal for medium- and high-power applications. The authenticity of semiconductor devices is one of the main concerns for these MLIs to operate properly. Due to the large number of switches in multilevel inverters, the possibility of a fault also arises. Hence, a reliable five-level inverter topology with fault-tolerant ability has been proposed. The proposed topology can withstand an open-circuit (OC) fault caused when any single switch fails. In comparison to typical multilevel inverters, the proposed topology is fault-tolerant and reliable. The simulation of the proposed topology is conducted in MATLAB-Simulink and PLECS software packages, and the results obtained for normal pre-fault, during-fault, and after-fault conditions are discussed. Experimental results also prove the proposed cell topology’s robustness and effectiveness in tolerating OC faults across the switches. Furthermore, a thorough comparison is provided to demonstrate the proposed topology’s superiority compared to recently published topologies with fault-tolerant features.

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“…Switching losses occur when the switches turn on or off [12,13]. Switching losses can be calculated by using the equations below.…”

Section: Switching Losses (P S )mentioning

confidence: 99%

A Robust Multilevel Inverter Topology for Operation under Fault Conditions

et al. 2021

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“…Khoun Jahan et al [15] considered a CHB and substituted several of its DC sources with capacitors which led to the usage of only one DC source in the inverter's structure. Hussan et al [16] came up with a boost inverter of gain 6, however, it cost 29 switches and a Total Standing Voltage (TSV) equal to 34. As an improvement, Taghvaie et al [17] lowered this number to 19 switches for the same voltage gain at the cost of a TSV equal to 39.…”

Section: Introductionmentioning

confidence: 99%

A Novel 19-Level Boost Type Switched-capacitor Inverter with Two DC Sources and Reduced Semiconductor Devices

Sagvand

Siahbalaee

Koochaki

2023

IJE

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In this paper, a novel voltage-boosting switched-capacitor multilevel inverter (SCMLI) capable of producing 19 voltage levels using a combination of only 10 switches, 4 diodes, 2 capacitors, and 2 DC sources has been proposed. The main features of the proposed topology are 1) utilization of a very low number of devices, 2) very low Total Standing Voltage (TSV) equal to 6.55 and 3) self-balance property of the capacitors' voltages. In order to provide the IGBTs of the circuit with the desired switching signals, the Nearest Level Control (NLC) method has been adopted. To clarify the benefits of the designed topology as to the total quantity of switches, DC sources, capacitors as well as the total standing voltage (TSV), and converter boosting, a thorough comparison has been carried out versus the recently published 19-level topologies. Also, for the purpose of performance evaluation and validation, the suggested topology has been tested against various loads through an experimental setup in the laboratory using TMS320F28379D DSP as the processor. The comparative, simulation, and experimental results all imply the superiority of the proposed topology against its predecessor counterparts.

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“…Therefore, the switched-capacitor (SC) concept integrated into MLIs is an effective solution to boost the low input voltage obtained from renewable energy sources such as PV and fuel cells with multistepped voltage levels. The concept of a SC inverter was introduced first by Mak and Ioinovici in 1998 (Hussan et al, 2021). In general, SC-based MLIs require a single dc source and capacitors in place of dc sources and take advantage of the series-parallel technique to boost the low input voltage near the sinusoidal output voltage waveform.…”

Section: Introductionmentioning

confidence: 99%

An improved seven-level switched-capacitor-based neutral-point clamped inverter

et al. 2022

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Multilevel inverters (MLIs) have seen significant growth in a variety of medium- to high-power industrial applications and have become a mature and viable solution for renewable energy systems over the past decade. The major concerns of MLIs are the high component count and the buck-type feature of the ac output voltage when used for grid-connected renewable-energy-based sources such as solar photovoltaic (PV) panels. As another option, a switched-capacitor (SC)-based inverter possessing the feature of boost ability is a prime solution to meet the requirements of ac power applications. Integrating an SC network with a neutral-point clamped (NPC) structure makes leakage current alleviation viable for transformerless PV grid-connected systems. In this article, an improved SCMLI based on the NPC structure is proposed to reduce the number of active switches and the number of switches in the charging loop, significantly reducing the power loss. It can generate seven voltage levels with voltage boosting and self-balancing of capacitors within a single-stage power conversion. The working principle of the proposed topology, circuit description, and control technique are presented. Further, the proposed inverter was compared with other recent SC topologies to show its superiority. In the end, a laboratory prototype was developed and tested for the seven-level module under steady-state and dynamic conditions to validate the practical viability of the proposed configuration. The proposed inverter’s maximum efficiency was 97.5% at 1.2 kW rated power.

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A Cross Connected Asymmetrical Switched-Capacitor Multilevel Inverter

Cited by 24 publications

References 41 publications

A Robust Multilevel Inverter Topology for Operation under Fault Conditions

A Robust Multilevel Inverter Topology for Operation under Fault Conditions

A Novel 19-Level Boost Type Switched-capacitor Inverter with Two DC Sources and Reduced Semiconductor Devices

An improved seven-level switched-capacitor-based neutral-point clamped inverter

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