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Network-agnostic adaptive PQ adjustment control for grid voltage regulation in PV systems

Network-agnostic adaptive PQ adjustment control for grid voltage regulation in PV systems
Network-agnostic adaptive PQ adjustment control for grid voltage regulation in PV systems

The service of grid voltage regulation is required nowadays from inverter-based resources (IBRs) particularly at the lower voltage level. In the transmission network, this is easily managed by leveraging solely the reactive power (Q) capability of the IBR, but in distribution networks that are mix of L and r the voltage magnitude is coupled with both active (P) and reactive power injection. There are methods in the literature designed for these cases that utilize both P and Q in voltage regulation, but they usually require network and load data, which may not be readily available. Furthermore, they often disregard an apparent nonmonotonic relation between the inverter terminal voltage and the P/Q ratio risking instability. To fill this gap, this article introduces a network-Agnostic P-Q adjustment technique for photovoltaic (PV) systems or other IBRs. The proposed technique tracks in a step-like manner the reference voltage set point if it is feasible, or the maximum grid voltage otherwise. This allows identification of the critical P/Q ratio without any prior information at the cost of limited voltage ripple due to a variable step-size strategy implemented. The superior performance of the proposed scheme is validated through simulations in MATLAB-Simulink in a reduced UKGDS 95-bus system and through lab experiments on a scaled down laboratory grade prototype.

Active power curtailment (APC), PV Inverter, network agnostic, reactive power, resistive network, voltage regulation
0093-9994
5792 - 5804
Das, Anubrata
428ad7ca-0fe8-40eb-86ea-de5153e5abd3
I. 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
I. Batzelis, Efstratios
2a85086e-e403-443c-81a6-e3b4ee16ae5e
Anand, Sandeep
85f066d6-b9d7-44fe-8b64-70ead88be1f1
Sahoo, Soumya Ranjan
31395542-4b92-435d-a7bb-863bd8e24baa

Das, Anubrata, I. Batzelis, Efstratios, Anand, Sandeep and Sahoo, Soumya Ranjan (2022) Network-agnostic adaptive PQ adjustment control for grid voltage regulation in PV systems. IEEE Transactions on Industry Applications, 58 (5), 5792 - 5804. (doi:10.1109/TIA.2022.3180280).

Record type: Article

Abstract

The service of grid voltage regulation is required nowadays from inverter-based resources (IBRs) particularly at the lower voltage level. In the transmission network, this is easily managed by leveraging solely the reactive power (Q) capability of the IBR, but in distribution networks that are mix of L and r the voltage magnitude is coupled with both active (P) and reactive power injection. There are methods in the literature designed for these cases that utilize both P and Q in voltage regulation, but they usually require network and load data, which may not be readily available. Furthermore, they often disregard an apparent nonmonotonic relation between the inverter terminal voltage and the P/Q ratio risking instability. To fill this gap, this article introduces a network-Agnostic P-Q adjustment technique for photovoltaic (PV) systems or other IBRs. The proposed technique tracks in a step-like manner the reference voltage set point if it is feasible, or the maximum grid voltage otherwise. This allows identification of the critical P/Q ratio without any prior information at the cost of limited voltage ripple due to a variable step-size strategy implemented. The superior performance of the proposed scheme is validated through simulations in MATLAB-Simulink in a reduced UKGDS 95-bus system and through lab experiments on a scaled down laboratory grade prototype.

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Anubrata - Network-Agnostic_Adaptive_PQ_Adjustment_Control - Accepted Manuscript
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More information

e-pub ahead of print date: 7 June 2022
Published date: 7 June 2022
Additional Information: Publisher Copyright: IEEE
Keywords: Active power curtailment (APC), PV Inverter, network agnostic, reactive power, resistive network, voltage regulation

Identifiers

Local EPrints ID: 471060
URI: http://eprints.soton.ac.uk/id/eprint/471060
ISSN: 0093-9994
PURE UUID: 5346b334-b0e3-4899-a5f3-9db2e428f49b
ORCID for Efstratios I. Batzelis: ORCID iD orcid.org/0000-0002-2967-3677

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Date deposited: 25 Oct 2022 16:36
Last modified: 25 Jan 2023 03:04

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Contributors

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

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