Seamless transition between grid forming and grid following inverters based on online grid impedance estimation
Seamless transition between grid forming and grid following inverters based on online grid impedance estimation
The rapid increase in the penetration of inverterbased resources (IBRs) into the distribution network causes thepower system to behave as a weak grid and often alters system strength. IBRs operate as either grid-following (GFL) or grid forming (GFM) inverters, differing in both control stability and inertia support capabilities under varying operating conditions. To maintain system stability across different grid strengths, IBRs need to support smooth switching between GFL and GFM modes. This paper presents an automatic smooth-switching control strategy based on online grid impedance estimation to enhance operational stability. Ordinary Least Squares (OLS) regression is used to estimate grid impedance, and hysteresis switching is applied to prevent continuous switching when grid strength fluctuates near boundary conditions. The effectiveness of the proposed control strategy is verified through case studies under varying grid strengths.
Pavan Kumar, Yadala
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Luo, Xi
cfaf6d5c-15fa-4c03-bdca-9e3d80ea448a
Batzelis, Stratis
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Singh, Abhinav Kumar
6df7029f-21e3-4a06-b5f7-da46f35fc8d3
Saridaki, Georgia
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Kotsampopoulos, Panos
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Hatziargyriou, Nikos
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Pavan Kumar, Yadala
5cd41b9c-57cc-4ac1-b36d-4143d5d1a81b
Luo, Xi
cfaf6d5c-15fa-4c03-bdca-9e3d80ea448a
Batzelis, Stratis
2a85086e-e403-443c-81a6-e3b4ee16ae5e
Singh, Abhinav Kumar
6df7029f-21e3-4a06-b5f7-da46f35fc8d3
Saridaki, Georgia
372ad773-adc3-4146-9c72-34a7f8e2b628
Kotsampopoulos, Panos
5e386e8f-aa83-4798-a8c3-c4ab65390fe9
Hatziargyriou, Nikos
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Pavan Kumar, Yadala, Luo, Xi, Batzelis, Stratis, Singh, Abhinav Kumar, Saridaki, Georgia, Kotsampopoulos, Panos and Hatziargyriou, Nikos
(2025)
Seamless transition between grid forming and grid following inverters based on online grid impedance estimation.
In Proceedings of IEEE PES General Meeting.
5 pp
.
(In Press)
Record type:
Conference or Workshop Item
(Paper)
Abstract
The rapid increase in the penetration of inverterbased resources (IBRs) into the distribution network causes thepower system to behave as a weak grid and often alters system strength. IBRs operate as either grid-following (GFL) or grid forming (GFM) inverters, differing in both control stability and inertia support capabilities under varying operating conditions. To maintain system stability across different grid strengths, IBRs need to support smooth switching between GFL and GFM modes. This paper presents an automatic smooth-switching control strategy based on online grid impedance estimation to enhance operational stability. Ordinary Least Squares (OLS) regression is used to estimate grid impedance, and hysteresis switching is applied to prevent continuous switching when grid strength fluctuates near boundary conditions. The effectiveness of the proposed control strategy is verified through case studies under varying grid strengths.
Text
Clean_Revised_Draft_PESGM_paper_Pavan
- Accepted Manuscript
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Accepted/In Press date: 7 March 2025
Identifiers
Local EPrints ID: 499871
URI: http://eprints.soton.ac.uk/id/eprint/499871
PURE UUID: 540685ab-d1b1-4b9f-9725-97755fbbe998
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Date deposited: 08 Apr 2025 16:31
Last modified: 22 Aug 2025 02:45
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Contributors
Author:
Yadala Pavan Kumar
Author:
Xi Luo
Author:
Stratis Batzelis
Author:
Abhinav Kumar Singh
Author:
Georgia Saridaki
Author:
Panos Kotsampopoulos
Author:
Nikos Hatziargyriou
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