A Distribution Power Electronic Transformer with MMC

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...

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Bibliographic Details
Published in:Applied sciences 2018-01, Vol.8 (1), p.120
Main Authors: Brando, Gianluca, Bova, Biagio, Cervone, Andrea, Dannier, Adolfo, Del Pizzo, Andrea
Format: Article
Language:English
Subjects:
Algorithms
dual active phase shift control
Electric converters
Electric power distribution
Low voltage
Mathematical models
modular multilevel converter
modulation technique
power electronic transformer
Power flow
predictive control algorithm
Square wave modulation
Topology
Voltage
voltage balancing
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app8010120