A New Three-Phase AC–DC–AC Multilevel Converter Based on Cascaded Three-Leg Converters

Maia, Ayslan C. N.; Jacobina, Cursino B.; Carlos, Gregory Arthur de Almeida

doi:10.1109/tia.2016.2646343

Cited by 23 publications

(9 citation statements)

References 20 publications

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“…The voltage gain of the proposed q-source converter is achieved by applying the volt-second balance to the instantaneous voltages of the inductor and coupled inductor. The voltage gain is deduced by considering all the passive and active power loss elements as relation (12). The parameter k does not significantly affect the voltage gain, and it is assumed k ≈ 1.…”

Section: Topology Analysismentioning

confidence: 99%

“…7 A conventional AC-AC power conversion method is AC-DC-AC converters. [8][9][10][11][12] These converters have a huge DC-link capacitor or an impedance-source-based circuit. AC-DC-AC converters are generally utilized for regulating the output frequency.…”

Section: Introductionmentioning

confidence: 99%

“…Most ac‐ac applications are variable frequency drive (VFD), 1 medium‐frequency transformer isolation, 2–4 induction heating systems, 5,6 and dynamic voltage restorers 7 . A conventional AC‐AC power conversion method is AC‐DC‐AC converters 8–12 . These converters have a huge DC‐link capacitor or an impedance‐source‐based circuit.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A single‐phase q‐source AC‐AC converter with continuous input current, safe commutation feature, and reduced bidirectional switch counts

Abdoli

Mosallanejad

2022

Circuit Theory & Apps

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This paper proposes a single‐phase q‐source AC‐AC converter with a wide and flexible voltage gain. The converter only incorporates two bidirectional power switches. This new topology has many bold features like continuous input current, non‐inverting boost, and inverting buck modes. The high voltage gain is achieved by utilizing a coupled inductor in the converter. The converter gain is increased by the turns ratio of the coupled inductor proportionately. The proposed q‐source comprises one input inductor, one coupled inductor, and one capacitor, which are less than other competitors. In order to reduce the voltage and current stresses on power semiconductors, a safe commutation strategy for the converter is also introduced that eliminates snubber circuits. The input and output filters are no longer required due to the proposed converter specifications. So the volume and cost of the converter are decreased significantly. The achieved efficiency equals 94.5% due to utilizing the proposed optimized topology and switching strategy. In this paper, the operating principle of the converter is presented in detail. An experimental prototype has been designed to examine the performance of the suggested converter. Results confirm the theory and operation of the proposed topology.

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Section: Topology Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A single‐phase q‐source AC‐AC converter with continuous input current, safe commutation feature, and reduced bidirectional switch counts

Abdoli

Mosallanejad

2022

Circuit Theory & Apps

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“…There are three popular methods for designing ac-ac power converters, as shown in Figure 1. Indirect ac-dc-ac converters are two-stage structures that involve a dc-link capacitor or impedance-source-based circuit, introduced as the first method [5][6][7][8][9][10]. The first stage is generally a front-end bidirectional current source rectifier (CSR), and the second stage is a voltage source inverter (VSI).…”

Section: Introductionmentioning

confidence: 99%

A highly efficient isolated single‐phase variable frequency AC–AC converter with flexible buck‐boost factor, inherent safe commutation, and continuous current

Abdoli

Mosallanejad

2022

IET Power Electronics

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This paper proposes an isolated single‐phase flexible buck‐boost ac–ac converter with an adjustable output frequency and optimized semiconductors count. One power switch only operates with a high switching frequency in each half‐cycle of the input voltage, and others operate with a low switching frequency equal to the output frequency. Thanks to this feature, the converter provides high efficiency, 95.5% in step‐down mode and 91.5% in step‐up mode. The galvanic isolation between the input and output sides is also regarded for the proposed topology by employing two coupled inductors. The converter has an inherent safe commutation by utilizing a simple modulation strategy. Thus, additional snubber circuits and complex commutation strategies are no longer required. The proposed converter does not require any input filter as it operates with the continuous input current. This paper presents the operating principle of the proposed topology in detail. For this purpose, a 200‐W experimental prototype has been designed to examine the performance of the suggested converter for different operating modes and output frequencies. Results confirm the theory and operation of the proposed topology.

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“…Ac-dc-ac converters have several applications [1][2][3][4] and these converters have been extensively studied in the literature. Among the usual applications, it is worth mentioning the use of ac-dc-ac converters as active power filters (APFs) [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Single‐phase universal active power filter based on ac–dc–ac converter with eight controlled switches

Rodrigues

Jacobina

Freitas

2019

IET Power Electronics

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This study presents an ac-dc-ac converter with eight controlled switches. The proposed topology is applied as a universal active power filter, compensating for disturbances in the grid voltage, voltage sags/swells, and harmonics generated by non-linear loads. The difference between the proposed and conventional solution is the addition of an uncontrolled leg (composed only of diodes) to increase the number of voltage levels, reducing harmonics and the average switching frequency. For performance comparisons, current total harmonic distortion (THD), voltage weighted THD, switching and conduction losses of the semiconductors, and average switching frequency were used as parameters. Control and pulse-width modulation techniques based on space vector approaches were developed to eliminate zero-crossing distortions caused by the use of the uncontrolled leg. Simulation and experimental results were presented for validation of the mathematical model.

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A New Three-Phase AC–DC–AC Multilevel Converter Based on Cascaded Three-Leg Converters

Cited by 23 publications

References 20 publications

A single‐phase q‐source AC‐AC converter with continuous input current, safe commutation feature, and reduced bidirectional switch counts

A single‐phase q‐source AC‐AC converter with continuous input current, safe commutation feature, and reduced bidirectional switch counts

A highly efficient isolated single‐phase variable frequency AC–AC converter with flexible buck‐boost factor, inherent safe commutation, and continuous current

Single‐phase universal active power filter based on ac–dc–ac converter with eight controlled switches

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