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

Naveed Ashraf, Ghulam Abbas (), Ali Raza, Nasim Ullah, Alsharef Mohammad and Mohamed Emad Farrag
Additional contact information
Naveed Ashraf: Department of Electrical Engineering, The University of Lahore, Lahore 54000, Pakistan
Ghulam Abbas: Department of Electrical Engineering, The University of Lahore, Lahore 54000, Pakistan
Ali Raza: Department of Electrical Engineering, University of Engineering and Technology, Lahore 54000, Pakistan
Nasim Ullah: Department of Electrical Engineering, College of Engineering, Taif University, Taif 21944, Saudi Arabia
Alsharef Mohammad: Department of Electrical Engineering, College of Engineering, Taif University, Taif 21944, Saudi Arabia
Mohamed Emad Farrag: School of Computing, Engineering and the Built Environment C011, Glasgow Caledonian University, 70 Cowcaddens Rd., Glasgow G4 0BA, UK

Energies, 2022, vol. 15, issue 20, 1-20

Abstract: 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.

Keywords: matrix converter; frequency controller; buck and boost operation; voltage and current surges; bipolar voltage gain; fully controlled devices; non-inverted and inverted operation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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