Increased Capacity Using VSC-HVDC Emergency Control in Voltage Stability-Constrained Systems
Malmer, Gabriel LU
; Hillberg, Emil
and Samuelsson, Olof
LU
(2026)
In IET Generation, Transmission & Distribution
20(1).
- Abstract
- Voltage instability imposes hard limits on transmission capacity in many power systems, constraining both real-time operation and ex-ante capacity allocations. This paper proposes a system integrity protection scheme (SIPS) based on VSC-HVDC links in hybrid AC/DC power systems, designed to maximise loadability under stressed conditions and thereby increase secure transmission capacity. The core contribution is a novel emergency power control (EPC) strategy, derived in closed form, that considers the active–reactive power trade-off when converter limits are reached. Two implementations are presented: one based on local measurements alone, and one augmented with synchrophasor data, both targeting the same objective of maximum loadability in... (More)
- Voltage instability imposes hard limits on transmission capacity in many power systems, constraining both real-time operation and ex-ante capacity allocations. This paper proposes a system integrity protection scheme (SIPS) based on VSC-HVDC links in hybrid AC/DC power systems, designed to maximise loadability under stressed conditions and thereby increase secure transmission capacity. The core contribution is a novel emergency power control (EPC) strategy, derived in closed form, that considers the active–reactive power trade-off when converter limits are reached. Two implementations are presented: one based on local measurements alone, and one augmented with synchrophasor data, both targeting the same objective of maximum loadability in the weakened grid. The proposed strategy is validated through dynamic simulations on a two-node system and a larger benchmark transmission system. Beyond dynamic performance, the scheme is incorporated as a remedial action in the flow-based (FB) capacity calculation framework, and an improvement to the FB methodology is proposed. Results show that the scheme can increase secure transmission capacity by up to 13%, depending on the initial operating point and proximity to other operational security limits. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/b6339abc-f94c-4779-8502-ebf1fe07b016
- author
- Malmer, Gabriel
LU
; Hillberg, Emil
and Samuelsson, Olof
LU
- organization
- publishing date
- 2026-09-07
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- corrective actions, emergency power control, flow-based capacity, SIPS, voltage stability, VSC-HVDC
- in
- IET Generation, Transmission & Distribution
- volume
- 20
- issue
- 1
- article number
- e70434
- pages
- 14 pages
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- scopus:105049713408
- ISSN
- 1751-8687
- DOI
- 10.1049/gtd2.70434
- project
- System Integrity Protection Schemes for increased Transfer Capacity
- language
- English
- LU publication?
- yes
- id
- b6339abc-f94c-4779-8502-ebf1fe07b016
- date added to LUP
- 2026-09-08 14:37:07
- date last changed
- 2026-09-25 04:00:47
@article{b6339abc-f94c-4779-8502-ebf1fe07b016,
abstract = {{Voltage instability imposes hard limits on transmission capacity in many power systems, constraining both real-time operation and ex-ante capacity allocations. This paper proposes a system integrity protection scheme (SIPS) based on VSC-HVDC links in hybrid AC/DC power systems, designed to maximise loadability under stressed conditions and thereby increase secure transmission capacity. The core contribution is a novel emergency power control (EPC) strategy, derived in closed form, that considers the active–reactive power trade-off when converter limits are reached. Two implementations are presented: one based on local measurements alone, and one augmented with synchrophasor data, both targeting the same objective of maximum loadability in the weakened grid. The proposed strategy is validated through dynamic simulations on a two-node system and a larger benchmark transmission system. Beyond dynamic performance, the scheme is incorporated as a remedial action in the flow-based (FB) capacity calculation framework, and an improvement to the FB methodology is proposed. Results show that the scheme can increase secure transmission capacity by up to 13%, depending on the initial operating point and proximity to other operational security limits.}},
author = {{Malmer, Gabriel and Hillberg, Emil and Samuelsson, Olof}},
issn = {{1751-8687}},
keywords = {{corrective actions; emergency power control; flow-based capacity; SIPS; voltage stability; VSC-HVDC}},
language = {{eng}},
month = {{09}},
number = {{1}},
publisher = {{John Wiley & Sons Inc.}},
series = {{IET Generation, Transmission & Distribution}},
title = {{Increased Capacity Using VSC-HVDC Emergency Control in Voltage Stability-Constrained Systems}},
url = {{http://dx.doi.org/10.1049/gtd2.70434}},
doi = {{10.1049/gtd2.70434}},
volume = {{20}},
year = {{2026}},
}