Quasi-Resonant Switched-Capacitor-Based Seven-Level Inverter With Reduced Capacitor Spike Current

Conventional energy sources will not be sufficient to meet future electrical demands, and also pollute the environment. Therefore, to meet their electrical energy needs, and maintain clean and green environmental conditions, people are focusing more on renewable energy sources. Small-scale PV solar standalone AC loads or grid integration applications need high voltage at a desired level, transformer/inductor less operation, high gain DC-DC front-end converters, and DC-AC converters. To achieve all the above objectives, this paper proposes a step-up quadruple boost nine-level inverter, it works on switched capacitor technique with a reduced count of components for the application of renewable energy systems. The proposed topology balances the capacitor voltages with the control scheme itself without using any sensors. A levelshifted pulse-width modulation (LPWM) technique can be used in the control strategy of the proposed topology. This paper covers the operational modes of the proposed topology, voltage stress calculations, capacitors calculations, and losses calculations at various stages and compared with recent literature, that reveals this topology is more advantageous in terms of less total standing voltage, switch count, cost factor, better efficiency and the number of gate driver circuits. The theoretical performance can be validated through MATLAB/Simulink-based simulation and their results are validated through prototype experimentation. Further, the experimental results contain modulation index variations, frequency modulation, switching frequency variations, input voltage variations, and load variations. Finally, the max efficiency of 96.5% is achieved for the experimental prototype of the proposed topology.INDEX TERMS Switched Capacitor (SC) based Inverter, High Gain inverter topologies, solar PV, self-voltage balance and Level Shifted Pulse Width Modulation (LSPWM).

Section: Comparison Analysis With Recent Topology Table 2 Comparison ...mentioning

confidence: 78%

“…In [29], a nine-level switched capacitor is proposed with unipolar Bi-directional and Bipolar unidirectional switches with two capacitors. In [30], a sevenlevel switched capacitor topology is proposed with a gain of three only. To get compatible grid voltages with the low voltage PV panels, it requires more gain than three.…”

Section: Introductionmentioning

confidence: 99%

Quadruple Boost Switched Capacitor-Based Inverter for Standalone Applications

Kovvali

Nakka

Kishore³

et al. 2023

“…TSVp.u./NL, TC /NL, TC/Gain), variety of capacitors utilized, and efficiency. The following observations are made while comparing the proposed topology with the topologies [10]- [19], [30]- [33] of Table IX. The proposed topology uses ten power switches, out of which two switches do not require antiparallel diodes.…”

Section: Table IX Comparison With Other Similar Topologiesmentioning

confidence: 99%

“…Furthermore, when comparing the ratio of TC/Gain for the proposed topology, it shows a value of 9, which is slightly higher than the ratios in topologies [16] and [17], which have values of 7.3 and 8.7 respectively. The comparison of the proposed topology when it is operated in 11L mode is done using other recent 11L topologies [20], [25]- [29], [34], and [35] as listed in Table IX. Except for the topology [28] and [34], all other topologies use more power components to generate 11L output voltage than the proposed topology.…”

Section: Table IX Comparison With Other Similar Topologiesmentioning

confidence: 99%

A 7L and 11L High Step-Up SCMLI Topology With Reduced Component Voltage Stress

Ali,

Khan,

Pandurangan

et al. 2023

This article proposes a new capacitor-based multilevel inverter topology (CBMLI) with fewer devices and reduced voltage stress on capacitors and switches. In addition, the proposed topology can be configured as either a 7-level (7L) or 11L circuit with a maximum voltage gain of 3 and 2.5 times, respectively. Comparisons are made between the proposed topology and existing recent CBMLI topologies, and various power loss analyses are presented. The capacitance values are determined by selecting the maximum discharging period, and the associated analysis is presented. Using the simulation software MATLAB/Simulink, the performance of the proposed circuit topology is validated, and the same is tested in the hardware setup. The various dynamic performance characteristics, such as loading changes, input variations, and modulation index, are validated, and the resulting data is discussed.

“…This topology does not boost the output voltage and requires more components to create levels. Topologies presented in [26], [27] are proposed on integrating multiple DC supplies and capacitors. These inverters necessitate additional voltage supplies for expanding to higher levels and are primarily suitable for specific applications such as renewable energy systems.…”

mentioning

confidence: 99%

A Novel Nine-Level Quadruple Boost Inverter for Electric Vehicle Applications

Dhasharatha,

Khan,

Mangu

2024

Lithium cells are commonly arranged in series and parallel configurations to fulfil the specific voltage and current necessities within electric vehicles (EVs). Voltage and charge equalization methods are implemented to safeguard these lithium cells. However, integrating these equalization circuits introduces some degree of loss into the overall circuit, and as a precautionary measure, the battery pack disconnects in case of any cell malfunction. Switched-capacitor (SC) inverters have gained prominence as an alternative approach to address voltage requirements. This article introduces a novel voltage boost multilevel inverter tailored for EV applications. The proposed nine-level quadruple boost (NLQB) inverter boasts an intrinsic capability for capacitor self-voltage balancing, streamlining its operational efficiency. Remarkably, capacitor voltage balancing algorithms or supplementary sensor circuits are rendered unnecessary due to this intrinsic self-balancing feature. Capacitors interfaced with a voltage source generate output levels with an appropriate charge/discharge pattern. The resultant output waveform spans nine levels, achieving a fourfold magnitude boost. A comprehensive comparison encompassing various parts, such as the number of power electronics, gate driver circuits, and capacitors, is presented. Additionally, system parameters, including voltage gain, blocking voltage, and total standing voltage (TSV) are evaluated to underscore the merits of the proposed NLQB inverter in contrast to recently proposed inverters.INDEX TERMS Switched capacitor, multilevel inverter, boosting gain, self balancing, electric vehicles I. INTRODUCTIONMultilevel inverters (MLIs) are gaining popularity due to their enhanced power handling capabilities and improved output quality, aligning with the global shift towards increased utilization of renewable energy sources. MLIs offer advantages such as improved output quality, reduced voltage stress, decreased electro-magnetic interference, and the need for small filter. These attributes make MLIs a practical choice for various applications. Among different types of MLIs, switchedcapacitor MLIs (SC-MLIs) have attracted attention from researchers due to their voltage-boosting properties. SC-MLIs find applications in diverse fields, such as electric vehicles, photovoltaic cells, and fuel cells.In a study by [1], a reduced semiconductor SC-MLI was proposed, where discrete diodes replaced some power switches, resulting in a decrease in the overall number of semiconductors. However, this SC-MLI exhibits a low voltage gain and needs additional capacitors to achieve high voltage levels due to its operation with symmetric DC sources.Authors in [2] proposed a multi source SC-MLI topology that eliminates the need for an H-bridge inverter. However, this design involves multiple DC supplies, semiconductors, and capacitors, reducing efficiency and increasing costs as the number of levels increases.The study by Lee et al. in [3] introduced a seven-level setup featuring a solitary input DC su...