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IAHO: Integrated Andronov-Hopf oscillator for providing ancillary services with single-phase grid-forming inverters

HAMED REZAZADEH, Mohammad Monfared Orcid Logo, Meghdad Fazeli Orcid Logo, Saeed Golestan

Electric Power Systems Research, Volume: 254, Start page: 112625

Swansea University Authors: HAMED REZAZADEH, Mohammad Monfared Orcid Logo, Meghdad Fazeli Orcid Logo

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DOI (Published version): 10.1016/j.epsr.2025.112625

Abstract

The increasing deployment of renewable energy sources is reducing system inertia and challenging grid stability. Meanwhile, the growing penetration of grid-forming(GFM) inverters offers opportunities to enhance frequency and voltage support. Among GFM techniques, virtual oscillator control (VOC) has...

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Published in: Electric Power Systems Research
ISSN: 0378-7796
Published: Elsevier BV 2026
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URI: https://cronfa.swan.ac.uk/Record/cronfa71293
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spelling 2026-01-23T12:40:26.4857664 v2 71293 2026-01-21 IAHO: Integrated Andronov-Hopf oscillator for providing ancillary services with single-phase grid-forming inverters 4c4dac47e9fc50d1eceab6e53ef0bbb4 HAMED REZAZADEH HAMED REZAZADEH true false adab4560ff08c8e5181ff3f12a4c36fb 0000-0002-8987-0883 Mohammad Monfared Mohammad Monfared true false b7aae4026707ed626d812d07018a2113 0000-0003-1448-5339 Meghdad Fazeli Meghdad Fazeli true false 2026-01-21 BGPS The increasing deployment of renewable energy sources is reducing system inertia and challenging grid stability. Meanwhile, the growing penetration of grid-forming(GFM) inverters offers opportunities to enhance frequency and voltage support. Among GFM techniques, virtual oscillator control (VOC) has emerged as a promising approach due to its superior dynamic performance, yet existing VOC strategies exhibit limitations in inertia emulation, damping, and droop accuracy. This paper proposes a control strategy based on the integrated Andronov–Hopf oscillator (IAHO) that, for the first time, unifies virtual inertia, enhanced damping, and voltage-independent droop control into a single framework. A comprehensive small-signal analysis is conducted to design the damping controllers, while a large-signal analysis evaluates transient stability under severe grid disturbances. Theoretical insights are experimentally validated on a 2.5 kVA single-phase inverter. Results demonstrate that the proposed IAHO delivers a lower rate of change of frequency (RoCoF), higher frequency nadir, well-damped power dynamics, and enhanced active power support compared to conventional VOC-based strategies. Moreover, the IAHO ensures positive reactive power droop during voltage sags, providing superior transient stability. Journal Article Electric Power Systems Research 254 112625 Elsevier BV 0378-7796 Battery energy storage system (BESS); Grid-forming (GFM) inverters; Transient stability; Virtual inertia; Virtual oscillator control (VOC) 1 5 2026 2026-05-01 10.1016/j.epsr.2025.112625 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University SU Library paid the OA fee (TA Institutional Deal) This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. 2026-01-23T12:40:26.4857664 2026-01-21T21:26:07.0687613 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering HAMED REZAZADEH 1 Mohammad Monfared 0000-0002-8987-0883 2 Meghdad Fazeli 0000-0003-1448-5339 3 Saeed Golestan 4 71293__36074__2bfb2e29dfeb47a3bf0cb5b0e70c760c.pdf 1-s2.0-S037877962501212X-main.pdf 2026-01-21T21:28:49.1209442 Output 7140941 application/pdf Version of Record true © 2025 The Author(s). This is an open access article under the CC BY license. true eng https://creativecommons.org/licenses/by/4.0/
title IAHO: Integrated Andronov-Hopf oscillator for providing ancillary services with single-phase grid-forming inverters
spellingShingle IAHO: Integrated Andronov-Hopf oscillator for providing ancillary services with single-phase grid-forming inverters
HAMED REZAZADEH
Mohammad Monfared
Meghdad Fazeli
title_short IAHO: Integrated Andronov-Hopf oscillator for providing ancillary services with single-phase grid-forming inverters
title_full IAHO: Integrated Andronov-Hopf oscillator for providing ancillary services with single-phase grid-forming inverters
title_fullStr IAHO: Integrated Andronov-Hopf oscillator for providing ancillary services with single-phase grid-forming inverters
title_full_unstemmed IAHO: Integrated Andronov-Hopf oscillator for providing ancillary services with single-phase grid-forming inverters
title_sort IAHO: Integrated Andronov-Hopf oscillator for providing ancillary services with single-phase grid-forming inverters
author_id_str_mv 4c4dac47e9fc50d1eceab6e53ef0bbb4
adab4560ff08c8e5181ff3f12a4c36fb
b7aae4026707ed626d812d07018a2113
author_id_fullname_str_mv 4c4dac47e9fc50d1eceab6e53ef0bbb4_***_HAMED REZAZADEH
adab4560ff08c8e5181ff3f12a4c36fb_***_Mohammad Monfared
b7aae4026707ed626d812d07018a2113_***_Meghdad Fazeli
author HAMED REZAZADEH
Mohammad Monfared
Meghdad Fazeli
author2 HAMED REZAZADEH
Mohammad Monfared
Meghdad Fazeli
Saeed Golestan
format Journal article
container_title Electric Power Systems Research
container_volume 254
container_start_page 112625
publishDate 2026
institution Swansea University
issn 0378-7796
doi_str_mv 10.1016/j.epsr.2025.112625
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Electronic and Electrical Engineering
document_store_str 1
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description The increasing deployment of renewable energy sources is reducing system inertia and challenging grid stability. Meanwhile, the growing penetration of grid-forming(GFM) inverters offers opportunities to enhance frequency and voltage support. Among GFM techniques, virtual oscillator control (VOC) has emerged as a promising approach due to its superior dynamic performance, yet existing VOC strategies exhibit limitations in inertia emulation, damping, and droop accuracy. This paper proposes a control strategy based on the integrated Andronov–Hopf oscillator (IAHO) that, for the first time, unifies virtual inertia, enhanced damping, and voltage-independent droop control into a single framework. A comprehensive small-signal analysis is conducted to design the damping controllers, while a large-signal analysis evaluates transient stability under severe grid disturbances. Theoretical insights are experimentally validated on a 2.5 kVA single-phase inverter. Results demonstrate that the proposed IAHO delivers a lower rate of change of frequency (RoCoF), higher frequency nadir, well-damped power dynamics, and enhanced active power support compared to conventional VOC-based strategies. Moreover, the IAHO ensures positive reactive power droop during voltage sags, providing superior transient stability.
published_date 2026-05-01T05:34:57Z
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score 11.096068

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