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Linear System Study of the Voltage Dynamics Impact on Frequency Control Performance
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.ORCID iD: 0000-0001-6541-7892
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.ORCID iD: 0000-0003-4736-4760
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.ORCID iD: 0000-0002-6431-9104
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems. Swedish Natl Grid Svenska Kraftnät, S-17224 Sundbyberg, Sweden..ORCID iD: 0000-0002-2356-4795
2024 (English)In: IEEE Access, E-ISSN 2169-3536, Vol. 12, p. 57755-57766Article in journal (Refereed) Published
Abstract [en]

The progressive retirement of conventional power plants is decreasing the total system inertia and making the frequency control more delicate. In this context, voltage-sensitive loads will have a more pronounced impact on frequency. Therefore, there is an interest in understanding and quantifying how voltage dynamics impact the frequency response. For this purpose, a linearization of the system and the analysis of the obtained transfer functions are in focus. The paper aims to complement the traditional eigenvalue analysis, capture a system's response to large disturbances, and estimate the frequency overshoots. The study also shows that controllers affecting the load voltage, such as Power System Stabilizers (PSSs), can impact frequency response during a large disturbance. The impact of PSS on system responses and its transfer functions is carried out by applying a general control configuration. Both conventional PSS1A and multi-band PSS designs are analyzed and compared. Thereby, the paper explicitly interlinks a PSS design, and its parameters with properties of the system's frequency response reflected in the system transfer function. Illustrating enhancements facilitated by the presented approach, the explicitly derived PSS designs demonstrate the potential to reduce frequency overshoot. As an example, this reduction is achieved by improving a common mode damping or changing the position of the dominant zero of the closed-loop system.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE) , 2024. Vol. 12, p. 57755-57766
Keywords [en]
Transfer functions, Frequency control, Power system dynamics, Load modeling, Frequency response, Linear systems, Stability analysis, Voltage control, Frequency containment reserves, general control configuration, low inertia, power system stabilizers, voltage-dependent load
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-346301DOI: 10.1109/ACCESS.2024.3390708ISI: 001208776300001Scopus ID: 2-s2.0-85190815531OAI: oai:DiVA.org:kth-346301DiVA, id: diva2:1857343
Note

QC 20240513

Available from: 2024-05-13 Created: 2024-05-13 Last updated: 2024-05-13Bibliographically approved

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Obradovic, DaniloRabuzin, TinGhandhari, MehrdadEriksson, Robert

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