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Energies 2019, 12(4), 589; https://doi.org/10.3390/en12040589

An Averaged-Value Model of an Asymmetrical Hybrid Multi-Level Rectifier

1
DI, University of Messina,98122 Messina, Italy
2
DIEEI, University of Catania, 95131 Catania, Italy
3
ST Microelectronics, I-95121 Catania, Italy
*
Author to whom correspondence should be addressed.
Received: 30 December 2018 / Revised: 1 February 2019 / Accepted: 6 February 2019 / Published: 13 February 2019
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Abstract

The development and the validation of an averaged-value mathematical model of an asymmetrical hybrid multi-level rectifier is presented in this work. Such a rectifier is composed of a three-level T-type unidirectional rectifier and of a two-level inverter connected to an open-end winding electrical machine. The T-type rectifier, which supplies the load, operates at quite a low switching frequency in order to minimize inverter power losses. The two-level inverter is instead driven by a standard sinusoidal pulse width modulation (SPWM) technique to suitably shape the input current. The two-level inverter also plays a key role in actively balancing the voltage across the DC bus capacitors of the T-type rectifier, making unnecessary additional circuits. Such an asymmetrical structure achieves a higher efficiency compared to conventional PWM multilevel rectifiers, even considering extra power losses due to the auxiliary inverter. In spite of its advantageous features, the asymmetrical hybrid multi-level rectifier topology is a quite complex system, which requires suitable mathematical tools for control and optimization purposes. This paper intends to be a step in this direction by deriving an averaged-value mathematical model of the whole system, which is validated through comparison with other modeling approaches and experimental results. The paper is mainly focused on applications in the field of electrical power generation; however, the converter structure can be also exploited in a variety of grid-connected applications by replacing the generator with a transformer featuring an open-end secondary winding arrangement. View Full-Text
Keywords: electrical drives; energy saving; multilevel power converters; permanent magnet synchronous generator; open-end winding configuration; voltage balancing; power factor electrical drives; energy saving; multilevel power converters; permanent magnet synchronous generator; open-end winding configuration; voltage balancing; power factor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Foti, S.; Scelba, G.; Testa, A.; Sciacca, A. An Averaged-Value Model of an Asymmetrical Hybrid Multi-Level Rectifier. Energies 2019, 12, 589.

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