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A state-space dynamic model for photovoltaic systems with full ancillary services support

A state-space dynamic model for photovoltaic systems with full ancillary services support
A state-space dynamic model for photovoltaic systems with full ancillary services support

Large-scale photovoltaic (PV) integration to the network necessitates accurate modeling of PV system dynamics under solar irradiance changes and disturbances in the power system. Most of the available PV dynamic models in the literature are scope-specific, neglecting some control functions and employing simplifications. In this paper, a complete dynamic model for two-stage PV systems is presented, given in entirely state-space form and explicit equations that takes into account all power circuit dynamics and modern control functions. This is a holistic approach that considers a full range of ancillary services required by modern grid codes, supports both balanced and unbalanced grid operation, and accounts for the discontinuous conduction mode of the dc/dc converter of the system. The proposed dynamic model is evaluated and compared to other approaches based on the literature, against scenarios of irradiance variation, voltage sags, and frequency distortion. Simulation results in MATLAB/Simulink indicate high accuracy at low computational cost and complexity.

Ancillary services, asymmetrical faults, discontinuous conduction mode (DCM), dynamic model, frequency response, Lambert W function, photovoltaic (PV) system, state-space model, two-stage system
1949-3029
1399-1409
Batzelis, Efstratios I.
2a85086e-e403-443c-81a6-e3b4ee16ae5e
Anagnostou, Georgios
41e8433d-52ec-4a6a-ba0f-1619b2e5bab8
Cole, Ian R.
80878ffa-9743-4309-a278-e2aca4b2c0ad
Betts, Thomas R.
c17091b2-674e-4fa6-a902-452d9687eba1
Pal, Bikash C.
c062978e-53eb-4d5d-ace8-746ccafa5fb0
Batzelis, Efstratios I.
2a85086e-e403-443c-81a6-e3b4ee16ae5e
Anagnostou, Georgios
41e8433d-52ec-4a6a-ba0f-1619b2e5bab8
Cole, Ian R.
80878ffa-9743-4309-a278-e2aca4b2c0ad
Betts, Thomas R.
c17091b2-674e-4fa6-a902-452d9687eba1
Pal, Bikash C.
c062978e-53eb-4d5d-ace8-746ccafa5fb0

Batzelis, Efstratios I., Anagnostou, Georgios, Cole, Ian R., Betts, Thomas R. and Pal, Bikash C. (2019) A state-space dynamic model for photovoltaic systems with full ancillary services support. IEEE Transactions on Sustainable Energy, 10 (3), 1399-1409, [8536445]. (doi:10.1109/TSTE.2018.2880082).

Record type: Article

Abstract

Large-scale photovoltaic (PV) integration to the network necessitates accurate modeling of PV system dynamics under solar irradiance changes and disturbances in the power system. Most of the available PV dynamic models in the literature are scope-specific, neglecting some control functions and employing simplifications. In this paper, a complete dynamic model for two-stage PV systems is presented, given in entirely state-space form and explicit equations that takes into account all power circuit dynamics and modern control functions. This is a holistic approach that considers a full range of ancillary services required by modern grid codes, supports both balanced and unbalanced grid operation, and accounts for the discontinuous conduction mode of the dc/dc converter of the system. The proposed dynamic model is evaluated and compared to other approaches based on the literature, against scenarios of irradiance variation, voltage sags, and frequency distortion. Simulation results in MATLAB/Simulink indicate high accuracy at low computational cost and complexity.

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More information

Published date: July 2019
Additional Information: Funding Information: Manuscript received July 13, 2018; revised October 5, 2018; accepted November 1, 2018. Date of publication November 15, 2018; date of current version June 20, 2019. The work of E. I. Batzelis was supported by the European Union’s Horizon 2020 Research and Innovation programme under the Marie Sklodowska-Curie Grant Agreement 746638. The work of G. Anagnostou, I. R. Cole, T. R. Betts, and B. C. Pal, which was part of the research project “Joint UK-India Clean Energy Centre (JUICE),” was supported by the RCUK’s Energy Programme under Contract EP/P003605/1. Paper no. TSTE-00704-2018. (Corresponding author: Efstratios I. Batzelis.) E. I. Batzelis, G. Anagnostou, and B. C. Pal are with the Department of Electrical and Electronic Engineering, Imperial College London, London SW7 2AZ, U.K. (e-mail:,e.batzelis@imperial.ac.uk; georgios.anagnostou11@ imperial.ac.uk; b.pal@imperial.ac.uk). Funding Information: The work of E. I. Batzelis was supported by the European Union's Horizon 2020 Research and Innovation programme under the Marie Sklodowska-Curie Grant Agreement 746638. Publisher Copyright: © 2019 IEEE. Copyright: Copyright 2019 Elsevier B.V., All rights reserved.
Keywords: Ancillary services, asymmetrical faults, discontinuous conduction mode (DCM), dynamic model, frequency response, Lambert W function, photovoltaic (PV) system, state-space model, two-stage system

Identifiers

Local EPrints ID: 449672
URI: http://eprints.soton.ac.uk/id/eprint/449672
ISSN: 1949-3029
PURE UUID: 1a67b0e5-d619-4db8-a52d-6767e14b81f8

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Date deposited: 10 Jun 2021 16:32
Last modified: 10 Jun 2021 16:32

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Contributors

Author: Efstratios I. Batzelis
Author: Georgios Anagnostou
Author: Ian R. Cole
Author: Thomas R. Betts
Author: Bikash C. Pal

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