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An adaptive p-Q management technique for grid voltage regulation using PV inverter

An adaptive p-Q management technique for grid voltage regulation using PV inverter
An adaptive p-Q management technique for grid voltage regulation using PV inverter

Network operators are currently exploring how embedded solar generation can assist with voltage regulation in the distribution network, usually by leveraging the inverter's reactive power capability. In highly resistive networks, reactive power alone may not be sufficient, which has motivated researchers to explore how simultaneous adjustment of active (P) and reactive (Q) power can result in better voltage regulation. However, the relevant published methods usually require unavailable network data as inputs and disregard the non-monotonic relation between P/Q power and voltage in resistive networks. This paper explores theoretically this relation and shows that there is always one optimal P/Q ratio that achieves maximum voltage for that particular loading condition. Surpassing this ratio results in voltage deterioration rather than improvement, which poses a risk for the relevant methods in the literature. To fill this gap, this paper introduces a new adaptive P/Q closed-loop voltage regulation scheme for PV systems and other inverter-based resources, which autonomously tracks this optimal ratio without any external inputs. This method guarantees that the resulting voltage would meet the target setpoint if feasible, or will be the maximum possible otherwise. This is the first technique to do this without any prior knowledge about the network. The proposed scheme is validated and assessed over other conventional voltage regulation methods in MATLAB/Simulink.

Active power curtailment (APC), Adaptive, Photovoltaic (PV) system, Reactive power control, Resistive network, Voltage regulation
Institute of Electrical and Electronics Engineers Inc.
Das, Anubrata
428ad7ca-0fe8-40eb-86ea-de5153e5abd3
Batzelis, Efstratios
2a85086e-e403-443c-81a6-e3b4ee16ae5e
Anand, Sandeep
85f066d6-b9d7-44fe-8b64-70ead88be1f1
Sahoo, Soumya Ranjan
31395542-4b92-435d-a7bb-863bd8e24baa
Das, Anubrata
428ad7ca-0fe8-40eb-86ea-de5153e5abd3
Batzelis, Efstratios
2a85086e-e403-443c-81a6-e3b4ee16ae5e
Anand, Sandeep
85f066d6-b9d7-44fe-8b64-70ead88be1f1
Sahoo, Soumya Ranjan
31395542-4b92-435d-a7bb-863bd8e24baa

Das, Anubrata, Batzelis, Efstratios, Anand, Sandeep and Sahoo, Soumya Ranjan (2020) An adaptive p-Q management technique for grid voltage regulation using PV inverter. In 2020 21st National Power Systems Conference, NPSC 2020. Institute of Electrical and Electronics Engineers Inc.. (doi:10.1109/NPSC49263.2020.9331760).

Record type: Conference or Workshop Item (Paper)

Abstract

Network operators are currently exploring how embedded solar generation can assist with voltage regulation in the distribution network, usually by leveraging the inverter's reactive power capability. In highly resistive networks, reactive power alone may not be sufficient, which has motivated researchers to explore how simultaneous adjustment of active (P) and reactive (Q) power can result in better voltage regulation. However, the relevant published methods usually require unavailable network data as inputs and disregard the non-monotonic relation between P/Q power and voltage in resistive networks. This paper explores theoretically this relation and shows that there is always one optimal P/Q ratio that achieves maximum voltage for that particular loading condition. Surpassing this ratio results in voltage deterioration rather than improvement, which poses a risk for the relevant methods in the literature. To fill this gap, this paper introduces a new adaptive P/Q closed-loop voltage regulation scheme for PV systems and other inverter-based resources, which autonomously tracks this optimal ratio without any external inputs. This method guarantees that the resulting voltage would meet the target setpoint if feasible, or will be the maximum possible otherwise. This is the first technique to do this without any prior knowledge about the network. The proposed scheme is validated and assessed over other conventional voltage regulation methods in MATLAB/Simulink.

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More information

Published date: 17 December 2020
Additional Information: Funding Information: This work is supported by INDO-UK Center For Education And Research In Clean Energy (IUCERCE) (DST/EE/2017038A) and the Royal Academy of Engineering under the Engineering for Development Research Fellowship scheme (no. RF\201819\18\86). Publisher Copyright: © 2020 IEEE Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
Venue - Dates: 21st National Power Systems Conference, NPSC 2020, , Gandhinagar, India, 2020-12-17 - 2020-12-19
Keywords: Active power curtailment (APC), Adaptive, Photovoltaic (PV) system, Reactive power control, Resistive network, Voltage regulation

Identifiers

Local EPrints ID: 449660
URI: http://eprints.soton.ac.uk/id/eprint/449660
PURE UUID: dbef7a87-a527-417a-931e-182d0a5c106f
ORCID for Efstratios Batzelis: ORCID iD orcid.org/0000-0002-2967-3677

Catalogue record

Date deposited: 10 Jun 2021 16:31
Last modified: 26 Nov 2021 03:23

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Contributors

Author: Anubrata Das
Author: Efstratios Batzelis ORCID iD
Author: Sandeep Anand
Author: Soumya Ranjan Sahoo

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