Switched-capacitor-based five-level inverter with closed-loop control for grid-connected PV application

Singh, Ashutosh Kumar; Mandal, Rajib Kumar

doi:10.1016/j.compeleceng.2023.108686

Cited by 11 publications

(3 citation statements)

References 26 publications

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“…As can be seen, the proposed topology is more efficient in terms of DC supply, capacitors, and switching devices, while the topologies presented in Refs. [31,32,43] employ less components and have lower TBVs than the proposed topology. However, the design that is suggested only requires a single DC voltage, two capacitors, and seventeen switching devices to generate a three-phase voltage, whereas the other two topologies require three voltage sources, three capacitors, and Another comparison has been carried out among different switched capacitor five-level inverters and the suggested topology, as shown in Table 5.…”

Section: Performance Comparative Analysismentioning

confidence: 99%

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A Single DC Source Five-Level Switched Capacitor Inverter for Grid-Integrated Solar Photovoltaic System: Modeling and Performance Investigation

et al. 2023

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Boost converters and multilevel inverters (MLI) are frequently included in low-voltage solar photovoltaic (PV) systems for grid integration. However, the use of an inductor-based boost converter makes the system bulky and increases control complexity. Therefore, the switched-capacitor-based MLI emerges as an efficient DC/AC voltage convertor with boosting capability. To make classical topologies more efficient and cost-effective for sustainable power generation, newer topologies and control techniques are continually evolving. This paper proposes a reduced-component-count five-level inverter design for generating stable AC voltages for sustainable grid-integrated solar photovoltaic applications. The proposed topology uses seven switching devices of lower total standing voltage (TSV), three diodes, and two DC-link capacitors to generate five-level outputs. By charging and discharging cycles, the DC capacitor voltages are automatically balanced. Thus, no additional sensors or control circuitry is required. It has inherent voltage-boosting capability without any input boost converter. A low-frequency-based half-height (HH) modulation technique is employed in the standalone system for better voltage quality. Extensive simulations are performed in a MATLAB/Simulink environment to estimate the performance of the proposed topology, and 17.58% THDs are obtained in the phase voltages. Using a small inductor in series or an inductive load, the current THD reduces to 8.23%. Better dynamic performance is also observed with different loading conditions. A miniature five-level single-phase laboratory prototype is developed to verify the accuracy of the simulation results and the viability of the proposed topology.

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Section: Performance Comparative Analysismentioning

confidence: 99%

“…Despite its self-balancing and voltageboosting abilities, its total blocking voltage and cost are prohibitive. Scientists are still working hard to perfect a topology that is not just cheap but also capable of boosting and self-balancing [31,32].…”

Section: Introductionmentioning

confidence: 99%

A Single DC Source Five-Level Switched Capacitor Inverter for Grid-Integrated Solar Photovoltaic System: Modeling and Performance Investigation

et al. 2023

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“…A selected harmonic elimination pulse width modulation technique is employed. The structure is designed to fit both symmetric and asymmetric DC sources [24]. A 9-level voltage was generated with a gain of two using a single DC source, eight switches, three capacitors, and two diodes.…”

Section: Introductionmentioning

confidence: 99%

A dual source switched-capacitors multilevel inverter topology with extended voltage levels and voltage gain

Al-Tameemi,

Babaei,

Sabahi

2024

Eng. Res. Express

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The switched-capacitors multi-level inverters (SCMLI) are widely used in renewable energy resources for enhancing the quality and reliability of generated power. This paper suggests a new topology of extendable voltage levels and voltage gain units using switched-capacitors SC with a dual dc source. The proposed unit can be extended by a modular pattern to increase the output voltage levels and voltage-boosting gain of the inverter. The main feature of this work is presenting a unit topology that utilizes multiple and modular sub-cells to increase the voltage gain at the output by increasing the number of the sub-cell components. A ternary relationship of the voltage value between the two asymmetrical dc sources is mandatory. Furthermore, all the capacitors are self-balanced, so there is no need for any additional and complex control circuit. Moreover, to decrease the cost factor of the inverter, a low IGBT switch count is taken into consideration and no passive diodes are used in the proposed structure. The H-bridge is connected to the unit to achieve bipolar voltage at the output. The operational analysis of the inverter is delineated in detail. A comparative study with state-of-art MLIs in different terms such as the number of components, the total standing voltage, the cost factor, and the gain show the particularity of the proposed topology. The simulation of the proposed MLI is performed using PSCAD-EMTDC software.

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Seven‐level single‐source switched capacitor inverter with triple boosting capability and high reliability

Zaid,

Moonis,

Sarwar

et al. 2024

Circuit Theory & Apps

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SummaryA single‐source switched capacitor multilevel inverter (SCMLI) topology utilizing only 10 switches and 1 diode with the capability of generating seven output voltage levels and a triple voltage boosting factor is proposed in this paper. The converter has capacitors that are self‐balanced and do not require any additional circuitry. The multicarrier sinusoidal pulse width modulation (PWM) technique is used to generate various switching signals for the 10 switches. Moreover, the reliability analysis using the Markov model has been carried out to assess the lifespan of power electronic components used in the proposed converter. The converter's performance is analyzed when an open circuit fault occurs in one or multiple switches. Power loss and efficiency in the converter are calculated by PLECS software using thermal modeling. The efficiency of SCMLI was found to be 97.6% for a 300 W load. The inverter working is verified by building a 500 W prototype in the lab. The experimental results in steady‐state and dynamic conditions agree with the theoretical and simulation analysis.

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Switched-capacitor-based five-level inverter with closed-loop control for grid-connected PV application

Cited by 11 publications

References 26 publications

A Single DC Source Five-Level Switched Capacitor Inverter for Grid-Integrated Solar Photovoltaic System: Modeling and Performance Investigation

A Single DC Source Five-Level Switched Capacitor Inverter for Grid-Integrated Solar Photovoltaic System: Modeling and Performance Investigation

A dual source switched-capacitors multilevel inverter topology with extended voltage levels and voltage gain

Seven‐level single‐source switched capacitor inverter with triple boosting capability and high reliability

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