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

Abdoli, Iman; Mosallanejad, Ali

doi:10.1049/pel2.12322

Cited by 8 publications

(17 citation statements)

References 35 publications

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“…But, other converters except 14,16 suffer from lack of one or both of them. The buck‐boost converter of Abdoli and Mosallanejad 25 provides high buck‐boost factor, but it requires more components.…”

Section: Results and Verificationsmentioning

confidence: 99%

A single‐phase p‐type ac–ac converter with reduced components count and high boost factor

Abdoli

Hajiabadi

Mosallanejad

et al. 2022

Circuit Theory & Apps

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This paper proposes a new single‐phase direct step‐up ac–ac converter by modifying the p‐type impedance source. It provides a high boost factor as well as high efficiency, while only six parts are required to design it, involving just two bidirectional power switches. A safe commutation method has been applied to power switches to make the converter snubber‐free and high efficient. Input and output harmonic filters are no longer required since input and output currents variate continuously with small ripple and low total harmonic distortion (THD). The proposed topology only modulates the output voltage amplitude, not the phase and frequency, so the output frequency is identical to the input frequency and constant. Thus, it can be utilized in step‐up conversion applications, like inductive power transmission from low ac voltage sources. Input and output have the same ground, which is a good protective feature. In this paper, the operating principle of the converter is demonstrated. Experimental results have been represented to evaluate the performance of the converter. For this purpose, an experimental prototype has been fabricated. Results are investigated and compared with other previous step‐up ac–ac converters. Results confirm the theory, operating principle, and performance of the converter.

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Section: Results and Verificationsmentioning

confidence: 99%

A single‐phase p‐type ac–ac converter with reduced components count and high boost factor

Abdoli

Hajiabadi

Mosallanejad

et al. 2022

Circuit Theory & Apps

Self Cite

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show abstract

“…One of the most influential groups of power electronic converters is the AC-AC converters. These converters have predominately extended in industrial applications as dynamic voltage restorers (DVR), 1,2 medium-frequency transformer isolation, [3][4][5] gridconnected wind turbines, induction heating systems, 6,7 and variable frequency drive (VFD). 8 AC-AC power converters are generally classified into three categories.…”

Section: Classifications Of Ac-ac Convertersmentioning

confidence: 99%

“…The proposed converter current stress is the same as Abdoli and Mosallanejad. 38 when the coupled inductors are identical or bigger than one. Besides, it is less than other converters for n ¼ m ¼ 1, as illustrated in Figure 10A.…”

Section: Volume Metric Analysismentioning

confidence: 99%

An isolated high‐gain impedance source‐based single‐phase AC–AC converter with safe commutation and variable output frequency

Abdoli

Mosallanejad

2023

Circuit Theory & Apps

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SummaryConventional AC–AC converters have some critical disadvantages, such as inappropriate input and output power quality features, employing snubber circuits to suppress the voltage stress on high‐frequency switches without a safe commutation method that increases the converter size and cost, confined voltage gain, and using huge passive components. This paper proposes an isolated high‐gain single‐phase AC–AC converter with variable output frequency, extended voltage gain, and a safe commutation strategy. Ten semiconductors are only employed for the proposed topology that only two switches and two diodes are operated with high‐frequency PWM signals. This new topology has noteworthy specifications like continuous input and output current, voltage isolation, extended inverting and non‐inverting buck‐boost modes, and frequency regulation. The high voltage gain has been achieved with small values for passive components in the impedance source section, reducing the volume and cost of the converter. The impedance source‐based section of the converter comprises one input inductor, two coupled inductors, and two capacitors in each converter leg. A safe commutation strategy has been designed and applied to the converter to mitigate the voltage and current stresses without extra snubber circuits. The number of semiconductors that simultaneously conduct in each state of the converter has been reduced. So, the conduction loss of the converter diminished. The achieved efficiency equals 95.5% and 93.5% in step‐down and step‐up modes, respectively, validated by an accurate power loss model and experimental analysis. An experimental prototype has been designed to confirm the performance of the suggested converter. Results confirm the theory and operation of the proposed converter.

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“…AC-AC converters are used in various fields, from domestic to industrial applications. Their basic role is to govern the output rms voltage and frequency per the load requirement or application [1]. These applications may include the correction of grid voltage through the dynamic voltage restorer, variable speed control system, solid-state transformer, and wind power system connected to the grid [2].…”

Section: Literature Reviewmentioning

confidence: 99%

A Single-Phase Compact-Sized Matrix Converter with Symmetrical Bipolar Buck and Boost Output Voltage Control

et al. 2022

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The development of single-phase symmetrical bipolar voltage gain matrix converters (MC) is growing rapidly as they find their application in power systems for dynamic restoration of line voltages, high voltage AC–DC converters, and variable frequency controllers for many industrial processes. However, the existing trend in matrix converter technology is a buck–boost operation that has inherently serious issues of high voltage and current surges or stresses. This is a big source of the high voltage and current rating of semiconductor switching devices. There is also a problem of high ripples both for voltage as well for current, requiring large size of filtering capacitors and inductors. The non-symmetrical control of the voltage gain increases the control complication. A large count of operating transistors is critical regarding their cost, size, and power conversion losses, as the space and cost required by their gate control circuits are much larger than the size and cost of the switching transistors. Thus, in this research work, a new single-phase MC is introduced only employing six fully controlled switching devices, ensuring similar operation or outputs as is obtained from the existing topologies that require the use of eight or more fully controlled switching devices, and the reduction by two or more switching transistors helps to compact the overall size and lower the overall cost. The separation in its voltage buck and boost operation enables smooth control of the voltage gain through duty cycle control. The low values of the voltage and current surges reduce the power rating and losses of the switching devices. The flow of the current in the filtering inductor is kept unidirectional to avoid the current interruption and reversal problem once the operation of the converter is abruptly switched from inverting to non-inverting and vice versa. All these factors are comprehensively detailed through the circuit’s description and comparative analysis. Simulation and practical results are presented to confirm the effectiveness of the developed circuit topology.

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

Cited by 8 publications

References 35 publications

A single‐phase p‐type ac–ac converter with reduced components count and high boost factor

A single‐phase p‐type ac–ac converter with reduced components count and high boost factor

An isolated high‐gain impedance source‐based single‐phase AC–AC converter with safe commutation and variable output frequency

A Single-Phase Compact-Sized Matrix Converter with Symmetrical Bipolar Buck and Boost Output Voltage Control

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