Impact of static and dynamic load models on security margin estimation methods
Artikel i vetenskaplig tidskrift, 2022

The post-contingency loadability limit (PCLL) and the secure operating limit (SOL) are the two main approaches used when computing the security margins of an electric power system. While the SOL is significantly more computationally demanding than the PCLL, it can account for the dynamic response after a disturbance and generally provides a better measure of the security margin. In this study, the difference between these two methods is compared and analyzed for a range of different contingency and load model scenarios. A methodology to allow a fair comparison between the two security margins is developed and tested on a modified version of the Nordic32 test system. The study shows that the SOL can differ significantly from the PCLL, especially when the system has a high penetration of loads with constant power characteristics or a large share of induction motor loads with fast load restoration. The difference between the methods is also tested for different contingencies, where longer fault clearing times are shown to significantly increase the difference between the two margins.

Dynamic security margins

load modelling

security assessment

security margin estimation

dynamic security limits

Författare

Hannes Hagmar

Chalmers, Elektroteknik, Elkraftteknik, Elnät och komponenter

Anh Tuan Le

Chalmers, Elektroteknik, Elkraftteknik, Elnät och komponenter

Robert Eriksson

Svenska kraftnät

Electric Power Systems Research

0378-7796 (ISSN)

Vol. 202 107581

Avancerad visualisering av spänningsstabilitetsgränser och systemskydd baserat på realtidsmätningar

Svenska kraftnät, 2016-06-01 -- 2020-12-31.

Energimyndigheten (44358-1), 2016-06-01 -- 2020-12-31.

Drivkrafter

Hållbar utveckling

Styrkeområden

Energi

Ämneskategorier

Energisystem

Reglerteknik

Annan elektroteknik och elektronik

DOI

10.1016/j.epsr.2021.107581

Mer information

Senast uppdaterat

2021-10-11