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Appl. Sci. 2018, 8(1), 120; https://doi.org/10.3390/app8010120

A Distribution Power Electronic Transformer with MMC

1
Department of Electrical Eng. and IT, DIETI, University of Naples Federico II, 80125 Naples, Italy
2
GETRA Engineering & Consulting, 81025 Caserta, Italy
*
Author to whom correspondence should be addressed.
Received: 4 December 2017 / Revised: 28 December 2017 / Accepted: 12 January 2018 / Published: 16 January 2018
(This article belongs to the Section Computer Science and Electrical Engineering)
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Abstract

This paper deals with a Power Electronic Transformer (PET) topology for a 3-phase AC distribution grid. In the discussed topology, a Modular Multilevel Converter (MMC) and a Full-Bridge converter are employed for the medium voltage (MV) and the low voltage (LV) side, respectively. By using the space vector, approach a mathematical model for the MMC is presented and a grid-synchronous algorithm is implemented to easily control the power flow through the structure. The MV and LV side converters are linked through a High Frequency (HF) transformer, whose control strategy is a Dual-Active Phase-Shift Control (PSC) with Square Wave Modulation (SQM). This technique is combined with a predictive algorithm, which is able to keep each leg’s capacitors’ voltages balanced both in stationary and in transient conditions. The proposed algorithm is numerically validated in the Matlab/Simulink® environment. View Full-Text
Keywords: power electronic transformer; modular multilevel converter; square wave modulation; voltage balancing; dual active phase shift control; predictive control algorithm; modulation technique power electronic transformer; modular multilevel converter; square wave modulation; voltage balancing; dual active phase shift control; predictive control algorithm; modulation technique
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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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MDPI and ACS Style

Brando, G.; Bova, B.; Cervone, A.; Dannier, A.; Del Pizzo, A. A Distribution Power Electronic Transformer with MMC. Appl. Sci. 2018, 8, 120.

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