A Soft-Switched Multi-Port Converter for PV/Supercapacitors Hybrid Systems Enabling Frequency Response Services
A Soft-Switched Multi-Port Converter for PV/Supercapacitors Hybrid Systems Enabling Frequency Response Services
Supercapacitors (SC) have superior performance for frequency response services in grid-tied photovoltaic (PV) systems owing to high power density. However, their variable voltage makes PV/SC hybridization quite challenging. The current body of literature lacks solutions that offer either a substantial step-up gain for the SC ports when controlled as a voltage source or a significant capability for high current discharging when controlled as a current source. To tackle this concern, this paper proposes a new compact multi-port dc/dc converter that integrates SC at the PV side by modifying the standard boost converter with three additional switches (two switches are soft switched and one is hard switched with low voltage) and three diodes. This topology allows SC operation at almost their entire voltage range, while a decoupling control method ensures separate regulation of the PV array and SC. The complete control scheme leverages both the SC and PV array for frequency response and comprises voltage recovery and protection for the SC. The proposed system is supported by theoretical analysis and design recommendations, as well as experimental validation results on a 675 Watt lab prototype.
Frequency response, Frequency services, Inductors, Inverters, multi-port converter, photovoltaic systems, supercapacitors, Switches, synthetic inertia, Topology, Voltage control, Zero voltage switching
1-15
Karpana, Sivakrishna
9532e5bb-ecf8-4af4-a617-57119f60d212
Batzelis, Efstratios
2a85086e-e403-443c-81a6-e3b4ee16ae5e
Kampitsis, Georgios
4bba7bcf-6422-4bf9-8996-528e7da1984e
Maiti, Suman
af45e307-f55a-436c-b3d2-4de256c6a19a
Chakraborty, Chandan
6701fe34-862b-432b-bbe1-041a66e68938
9 January 2024
Karpana, Sivakrishna
9532e5bb-ecf8-4af4-a617-57119f60d212
Batzelis, Efstratios
2a85086e-e403-443c-81a6-e3b4ee16ae5e
Kampitsis, Georgios
4bba7bcf-6422-4bf9-8996-528e7da1984e
Maiti, Suman
af45e307-f55a-436c-b3d2-4de256c6a19a
Chakraborty, Chandan
6701fe34-862b-432b-bbe1-041a66e68938
Karpana, Sivakrishna, Batzelis, Efstratios, Kampitsis, Georgios, Maiti, Suman and Chakraborty, Chandan
(2024)
A Soft-Switched Multi-Port Converter for PV/Supercapacitors Hybrid Systems Enabling Frequency Response Services.
IEEE Transactions on Industry Applications, .
(doi:10.1109/TIA.2024.3351628).
Abstract
Supercapacitors (SC) have superior performance for frequency response services in grid-tied photovoltaic (PV) systems owing to high power density. However, their variable voltage makes PV/SC hybridization quite challenging. The current body of literature lacks solutions that offer either a substantial step-up gain for the SC ports when controlled as a voltage source or a significant capability for high current discharging when controlled as a current source. To tackle this concern, this paper proposes a new compact multi-port dc/dc converter that integrates SC at the PV side by modifying the standard boost converter with three additional switches (two switches are soft switched and one is hard switched with low voltage) and three diodes. This topology allows SC operation at almost their entire voltage range, while a decoupling control method ensures separate regulation of the PV array and SC. The complete control scheme leverages both the SC and PV array for frequency response and comprises voltage recovery and protection for the SC. The proposed system is supported by theoretical analysis and design recommendations, as well as experimental validation results on a 675 Watt lab prototype.
Text
Karpana - Soft-switching PV-Supercap converter
- Accepted Manuscript
More information
Accepted/In Press date: 29 December 2023
e-pub ahead of print date: 9 January 2024
Published date: 9 January 2024
Additional Information:
Publisher Copyright:
IEEE
Keywords:
Frequency response, Frequency services, Inductors, Inverters, multi-port converter, photovoltaic systems, supercapacitors, Switches, synthetic inertia, Topology, Voltage control, Zero voltage switching
Identifiers
Local EPrints ID: 486265
URI: http://eprints.soton.ac.uk/id/eprint/486265
ISSN: 0093-9994
PURE UUID: f80faddc-e097-4b80-9ab9-e5901064a0d8
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Date deposited: 16 Jan 2024 17:38
Last modified: 22 Mar 2024 03:00
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Contributors
Author:
Sivakrishna Karpana
Author:
Efstratios Batzelis
Author:
Georgios Kampitsis
Author:
Suman Maiti
Author:
Chandan Chakraborty
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