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Design optimisation of a current-fed solid-State transformer for MV grid-connected applications

Design optimisation of a current-fed solid-State transformer for MV grid-connected applications
Design optimisation of a current-fed solid-State transformer for MV grid-connected applications
For integrating large batteries in the medium voltage grid, current fed solid-state transformers offer galvanic isolation and a significant weight and size reduction. While the power losses increase with frequency and flux density, the core volume is contrariwise. Therefore, a design optimisation to achieve minimum losses and/or a minimum volume is essential. An optimisation strategy is proposed in this paper to find the optimum operating frequency and core flux density under certain practical constraints such as winding voltage per turn, clearance between transformer windings, saturation flux density and minimum efficiency. Differently from previous works, the proposed strategy provides a holistic approach for the design considering all main power losses from all main components using nonsinusoidal voltage waveforms and different operating conditions. Analytical equations for the power losses calculation and the cores design are derived and validated using ANSYS and MATLAB Simulink software packages. Simulation results of the power loss calculation under different operating frequencies and duty cycles are presented and compared with the analytical results. A case study for designing a 1.0 MW, 0.6/18 kV current fed solid-state transformer is presented. The results of two optimisation objectives, minimum power losses or minimum total cores housing volume are also shown.
grid connected, optimisation, power losses, solid state transformer
1996-1073
3283
Hussain, Essam
1a233bd7-9bf5-4007-9eee-14d20320b105
Mohammad, Abusara
2e4034f9-88a6-492d-ae39-78ac0a234b78
Sharkh, Suleiman
c8445516-dafe-41c2-b7e8-c21e295e56b9
Hussain, Essam
1a233bd7-9bf5-4007-9eee-14d20320b105
Mohammad, Abusara
2e4034f9-88a6-492d-ae39-78ac0a234b78
Sharkh, Suleiman
c8445516-dafe-41c2-b7e8-c21e295e56b9

Hussain, Essam, Mohammad, Abusara and Sharkh, Suleiman (2021) Design optimisation of a current-fed solid-State transformer for MV grid-connected applications. Energies, 14 (11), 3283, [3283]. (doi:10.3390/en14113283).

Record type: Article

Abstract

For integrating large batteries in the medium voltage grid, current fed solid-state transformers offer galvanic isolation and a significant weight and size reduction. While the power losses increase with frequency and flux density, the core volume is contrariwise. Therefore, a design optimisation to achieve minimum losses and/or a minimum volume is essential. An optimisation strategy is proposed in this paper to find the optimum operating frequency and core flux density under certain practical constraints such as winding voltage per turn, clearance between transformer windings, saturation flux density and minimum efficiency. Differently from previous works, the proposed strategy provides a holistic approach for the design considering all main power losses from all main components using nonsinusoidal voltage waveforms and different operating conditions. Analytical equations for the power losses calculation and the cores design are derived and validated using ANSYS and MATLAB Simulink software packages. Simulation results of the power loss calculation under different operating frequencies and duty cycles are presented and compared with the analytical results. A case study for designing a 1.0 MW, 0.6/18 kV current fed solid-state transformer is presented. The results of two optimisation objectives, minimum power losses or minimum total cores housing volume are also shown.

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Accepted/In Press date: 1 June 2021
e-pub ahead of print date: 4 June 2021
Published date: June 2021
Additional Information: Funding Information: Funding: This research was funded by the INTERREG Channel funding stream through the Intelligent Community Energy (ICE) project, Grant Agreement Number 5025. Publisher Copyright: © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
Keywords: grid connected, optimisation, power losses, solid state transformer

Identifiers

Local EPrints ID: 449728
URI: http://eprints.soton.ac.uk/id/eprint/449728
ISSN: 1996-1073
PURE UUID: 4920d076-9cf0-43fc-9e5f-f439f1723f74
ORCID for Suleiman Sharkh: ORCID iD orcid.org/0000-0001-7335-8503

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Date deposited: 14 Jun 2021 16:32
Last modified: 22 Nov 2022 02:33

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Contributors

Author: Essam Hussain
Author: Abusara Mohammad
Author: Suleiman Sharkh ORCID iD

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