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Analysis of transfer-limit induced power system security by Markov chain Monte Carlo simulation
KTH, School of Electrical Engineering (EES), Electric Power Systems.
KTH, School of Electrical Engineering (EES), Electric Power Systems.ORCID iD: 0000-0002-8189-2420
2012 (English)In: European transactions on electrical power, ISSN 1430-144X, E-ISSN 1546-3109, Vol. 22, no 2, 140-151 p.Article in journal (Refereed) Published
Abstract [en]

Adequate security margins are commonly applied in power systems by keeping predefined transfer limits through certain transmission corridors in the system. These limits are often set to keep the criterion stating that the system should remain stable after the loss of any component. For many stability criteria such as, voltage stability, and voltage limits at specific nodes, the distribution of the injected power amongst the nodes of the system will be of vital importance. To incorporate this into the analysis of transfer limits the uncertainties in nodal loading and wind power production will have to be considered. In this article we propose a new method for generating samples of the power at all nodes given a set of transfers through specified corridors of the power system. It is then shown how the method can be used to evaluate the risk of violating the system stability limits induced by choosing a specific set of transfer limits. The method can be used in power system operations planning when setting the limits for trading and transfer between the different nodes of the power system.

Place, publisher, year, edition, pages
2012. Vol. 22, no 2, 140-151 p.
Keyword [en]
power system security, net transfer capacity, Markov chain Monte Carlo, voltage instability
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-41976DOI: 10.1002/etep.551ISI: 000302015200003Scopus ID: 2-s2.0-84859104327OAI: oai:DiVA.org:kth-41976DiVA: diva2:445729
Funder
StandUp
Note

QC 20120503

Available from: 2011-10-04 Created: 2011-10-04 Last updated: 2017-12-08Bibliographically approved
In thesis
1. A Stochastic Control Approach to Include Transfer Limits in Power System Operation
Open this publication in new window or tab >>A Stochastic Control Approach to Include Transfer Limits in Power System Operation
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The main function of the power grid is to transfer electric energy from generating facilities to consumers. To have a reliable and economical supply of electricity, large amounts of electric energy often have to be transferred over long distances.

The transmission system has a limited capacity to transfer electric power, called the transfer capacity. Severe system failures may follow if the transfer capacity is reached during operation.

Due to uncertainties, such as the random failure of system components, the transfer capacity for the near future is not readily determinable. Also, due to market principles, and reaction times and ramp rates of production facilities, power flow control is not fully flexible. Therefore, a transfer limit, which is below the transfer capacity, is decided and preventative actions are taken when the transfer reaches this limit.

In this thesis an approach to deciding an optimal strategy for power flow control through activation of regulating bids on the regulating power market is outlined. This approach leads to an optimal definition of transfer limits as the boundary between the domain where no bid should be activated and the domains where bids should be activated. The approach is based on weighing the expected cost from system failures against the production cost. This leads to a stochastic impulse control problem for a Markov process in continuous time.

The proposed method is a novel approach to decide transfer limits in power system operation. The method is tested in a case study on the IEEE 39 bus system, that shows promising results.

In addition to deciding optimal transfer limits, it is also investigated how the transfer capacity can be enhanced by controlling components in the power system to increase stability.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. xi, 67 p.
Series
Trita-EE, ISSN 1653-5146 ; 2011:070
Keyword
Frequency control, power regulating market, power system operation, power system security, stochastic impulse control, transfer capacity, transfer limit
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-41986 (URN)978-91-7501-132-5 (ISBN)
Public defence
2011-11-07, F3, Lindstedtsv 26, entréplan, KTH, S, 10:00 (English)
Opponent
Supervisors
Note
QC 20111010Available from: 2011-10-10 Created: 2011-10-04 Last updated: 2011-10-10Bibliographically approved

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Söder, Lennart

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