Modeling of small-signal stability margin constrained optimal power flow

Huang, Zheng, Wang, Kewen, Wang, Yi, Wen, Fushuan, Dinavahi, Venkata and Liang, Jun ORCID: https://orcid.org/0000-0001-7511-449X 2024. Modeling of small-signal stability margin constrained optimal power flow. International Journal of Electrical Power & Energy Systems 162 , 110338. 10.1016/j.ijepes.2024.110338

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Abstract

This paper presents a novel small-signal stability margin (SSSM) constrained optimal power flow model for generation dispatch to minimize the generation cost while retaining adequate SSSM. The SSSM constraint is described in terms of the total active load variation between an initial operating point and the critical point, which is located on the dynamic performance boundary of small-signal stability. From the existing SSSM model, where the steady-state equation and the small-signal stability equation are taken into account, a modified SSSM model is proposed to reduce the computational requirement. The sensitivity representation of SSSM with respect to operating parameters is newly derived, which makes it possible for the SSSM and steady-state optimization problems to be jointly solved. A joint solution approach is proposed to solve the small-signal stability margin constrained optimal power flow (SSSMC-OPF) model. Simulation results show that the proposed approach can effectively minimize the generation cost subject to retaining a certain level of SSSM. For an 8-machine 24-bus system and a modified practical 68-machine 2395-bus system, the generation costs of SSSMC-OPF are increased by 5.28% and 2.73%, respectively, but the SSSMs are improved by 45% and 14.41%, respectively, compared to the optimal power flow.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	Elsevier
ISSN:	0142-0615
Date of First Compliant Deposit:	26 November 2024
Date of Acceptance:	22 October 2024
Last Modified:	26 Nov 2024 14:19
URI:	https://orca.cardiff.ac.uk/id/eprint/174028

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