An Asymmetric Switched Capacitor Multilevel Inverter With Component Reduction

Taheri, Asghar; Rasulkhani, Ahad; Ren, Hai‐Peng

doi:10.1109/access.2019.2938980

Cited by 42 publications

(39 citation statements)

References 28 publications

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“…An asymmetric cascaded multilevel inverter shown in Figure 28 is developed with reduced number of switches, dc sources, so that size, complexity, and loss in the MLI topology get reduced. In order to balance the capacitor voltage, a different technique of charging and discharging is used 51 . A cross‐switched‐capacitor multilevel inverter is proposed for symmetric as well as asymmetric dc voltage configurations which is shown in Figure 29.…”

Section: Categories Of Switched‐capacitor Multilevel Inverter (Scmli)mentioning

confidence: 99%

Recent trends and review onswitched‐capacitor‐basedsingle‐stageboost multilevel inverter

Kumari

Siddique

Sarwar

et al. 2021

Int Trans Electr Energ Syst

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Summary Multilevel inverters are very popular in renewable energy applications. These inverters produce output voltages close to sinusoidal and have lower harmonics as compared to the conventional two‐level inverters as it also helps in reducing the size of the filter, thus makes the circuitry less complicated. In conventional multilevel inverter topologies, the number of devices increases with the increase of the number of output voltage levels, which in turn makes circuitry bulky and costly. Further, the boosting feature of the input voltage is also necessary for the application of multilevel inverters with renewable energy. Therefore, to reduce the count of devices, losses, and rating of devices, various switched‐capacitor multilevel inverter topologies are proposed. Switched‐capacitor multilevel inverter topologies (SCMLIs) can generate multiple voltage levels along with high voltage gain with a minimum number of devices. This paper gives a detailed overview of the recently introduced SCMLIs. The different SCMLIs have been categorized based on the number of levels and voltage gains. A detailed comparison has been introduced in this paper. Finally, few SCMLI topologies have been experimentally validated using the experimental results.

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Section: Categories Of Switched‐capacitor Multilevel Inverter (Scmli)mentioning

confidence: 99%

Recent trends and review onswitched‐capacitor‐basedsingle‐stageboost multilevel inverter

Kumari

Siddique

Sarwar

et al. 2021

Int Trans Electr Energ Syst

View full text Add to dashboard Cite

show abstract

“…In these converters, the negative terminal of the PV is directly connected to the neutral point of the grid; therefore, the general CMV is removed correctly [55]. Today, other common-grounded schemes have tried to reduce the number of DC voltage sources by using capacitors [56]. Switched-Capacitor based inverters use the virtual dc-link concept to obtain two times boost factor within a single-stage operation without using any auxiliary inductors.…”

Section: Common-grounded Invertermentioning

confidence: 99%

Leakage Current Reduction in Single-Phase Grid-Connected Inverters—A Review

et al. 2020

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The rise in renewable energy has increased the use of DC/AC converters, which transform the direct current to alternating current. These devices, generally called inverters, are mainly used as an interface between clean energy and the grid. It is estimated that 21% of the global electricity generation capacity from renewable sources is supplied by photovoltaic systems. In these systems, a transformer to ensure grid isolation is used. Nevertheless, the transformer makes the system expensive, heavy, bulky and reduces its efficiency. Therefore, transformerless schemes are used to eliminate the mentioned disadvantages. One of the main drawbacks of transformerless topologies is the presence of a leakage current between the physical earth of the grid and the parasitic capacitances of the photovoltaic module terminals. The leakage current depends on the value of the parasitic capacitances of the panel and the common-mode voltage. At the same time, the common-mode voltage depends on the modulation strategy used. Therefore, by the manipulation of the modulation technique, is accomplished a decrease in the leakage current. However, the connection standards for photovoltaic inverters establish a maximum total harmonic distortion of 5%. In this paper an analysis of the common-mode voltage and its influence on the value of the leakage current is described. The main topologies and strategies used to reduce the leakage current in transformerless schemes are summarized, highlighting advantages and disadvantages and establishing points of comparison with similar topologies. A comparative table with the most important aspects of each converter is shown based on number of components, modes of operation, type of modulation strategy used, and the leakage current value obtained. It is important to mention that analyzed topologies present a variation of the leakage current between 0 to 180 mA. Finally, the trends, problems, and researches on transformerless grid-connected PV systems are discussed.

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“…The topologies presented in [9, 11, 13–19, 21, 23, 24, 27] are modular and can be extended by increment of switched‐capacitor stages, where the non‐modular structures presented in [10, 12, 20, 22] can only be extended by cascading the basic units. This increases the number of sources/devices, weight, cost, and volume of the converter.…”

Section: Introductionmentioning

confidence: 99%

Generalized diamond‐type single DC‐source switched‐capacitor based multilevel inverter with step‐up and natural voltage balancing capabilities

Deliri

Varesi

Siwakoti

et al. 2021

IET Power Electronics

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This paper proposes a diamond‐shaped high step‐up switched‐capacitor based basic multilevel inverter topology. The basic switched‐capacitor (SC) stage consists of 2 active switches, 2 diodes, and 2 capacitors. Using a single DC source with the unfolding circuit (10 switches, 5 capacitors, and 5 diodes) results in the production of 17 voltage‐steps at the output with the gain of up to 8 times of the input voltage. By extending the diamond‐shaped switched‐capacitor stages, higher voltage levels and voltage gains can be possible. The suggested topology employs two half‐bridges (instead of a full‐bridge) to produce positive, zero, and negative steps, which reduces the Voltage Stress (VS) on two output switches and consequently reduces Total Voltage Stress (TVS). In addition, the natural voltage balancing of capacitors eliminates the need to an additional control circuitry and consequently reduces the total converter size, complexity, and cost. In addition, modularity, scalability, low voltage ripple on capacitors, low total voltage stress, high power quality, and capability of supplying low/medium power factor (R‐L) loads are some of the merits of the proposed topology. The low Cost Function (CF) obtained in the comparison section as well as experimental results verifies the advantages of the proposed topology.

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An Asymmetric Switched Capacitor Multilevel Inverter With Component Reduction

Cited by 42 publications

References 28 publications

Recent trends and review onswitched‐capacitor‐basedsingle‐stageboost multilevel inverter

Recent trends and review onswitched‐capacitor‐basedsingle‐stageboost multilevel inverter

Leakage Current Reduction in Single-Phase Grid-Connected Inverters—A Review

Generalized diamond‐type single DC‐source switched‐capacitor based multilevel inverter with step‐up and natural voltage balancing capabilities

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