A Novel Solid-State Transformer with Improved Flyback Converter Equipped with Quasi Z-Source Converter for Medium-Voltage Utility Grid

A Novel Solid-State Transformer with Improved Flyback Converter Equipped with Quasi Z-Source Converter for Medium-Voltage Utility Grid

This paper introduces an enhanced solid-state transformer topology for a medium-voltage (MV) utility grid. The main objective of the current study is to develop an improved flyback converter equipped with a quasi z-source converter (qZ_iFC) having a high-voltage conversion capability for the integra...

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Bibliographic Details
Published in:Energies (Basel) Vol. 16; no. 6; p. 2687
Main Authors: Cuma, Mehmet Uğraş, Anvari, Alireze Deljavan, Savrun, Murat Mustafa
Format: Journal Article
Language:English
Published: Basel MDPI AG 01-03-2023
Subjects:
Alternative energy sources
Controllers
Design and construction
Efficiency
Electric current converters
Electric transformers
Energy resources
flyback converter
High gain
Mathematical models
medium-voltage utility
Power
Power flow
quasi z-source
Renewable resources
Solid state
solid-state transformer
Topology
Voltage
Voltage gain
Turkey
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Description
Summary:This paper introduces an enhanced solid-state transformer topology for a medium-voltage (MV) utility grid. The main objective of the current study is to develop an improved flyback converter equipped with a quasi z-source converter (qZ_iFC) having a high-voltage conversion capability for the integration of low-input voltage to the DC link of an MV modular multilevel converter (MMC). The system integrates the quasi z-source and flyback converters by operating their existing switches complementary. Furthermore, the high-gain qZ_iFC allows for a reduction in the rated voltage of the input, as well as the use of a high-frequency transformer (HFT) with a unity turns ratio that provides galvanic isolation between the input and the output ports. Thus, using an HFT just for isolation purposes without voltage gain improves the system efficiency. In addition, a controller for (i) qZ_iFC which is regulating complementary switches to prevent the shoot-through current from reaching the HFT resulting in saturation; and (ii) a controller for MMC to produce MV-level AC voltage for loads are suggested. The performance of the proposed system was evaluated for several operating conditions. Results show that the proposed SST smoothly performs the power flow between the ports during steady-state and transient conditions. The power flow capabilities and efficiency values validate the viability and effectiveness of the proposed system.
ISSN:1996-1073
1996-1073
DOI:10.3390/en16062687