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Test Scenarios for Validation of the Offline Workflow of the iTesla Toolbox for Small-Signal Stability Assessment
KTH, School of Electrical Engineering (EES), Electric Power Systems.
2015 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Transmission System Operators (TSOs) are facing new challenges due to

the larger amount of renewable and intermittent energies injected into the

electric grid and to new power electronics devices with fast dynamics.

Keeping the balance between production and consumption is the

responsibility of TSOs and it is becoming more challenging due to these

increased uncertainties.

These new challenges were the main motivation for the iTesla project.

The project aims to develop a tool to help the TSOs evaluating the risks of a

given situation, by simulating a lot of different scenarios beforehand. The

idea is to create security rules thanks to the work done beforehand that will

serve to judge the safety of the real-time situation. In order to assess the

severity of a fault, several indicators have been developed. Concerning the

validation of the small signal stability index, a set of test signals with interarea

oscillations would be appreciated.

This is the goal of this master thesis: to create a set of inter-area

oscillating signals from a given network topology.

A brief introduction to inter-area oscillations and to the model used for

analysis of inter-area oscillations is first presented. Existing methods for

estimation of modes from ringdown analysis are introduced. The small

signal stability index used for power system dynamic impact assessment in

iTesla is presented and tested on different scenarios. A comparison

between existing mod

ules based on Prony’s method has been done on

some test signals.

The French network has been studied in order to scan the modes

inherent to the power system. Thanks to this analysis, some well chosen

regulators of generators have been modified so that poorly damped

oscillations with a low frequency may appear. This operation has been

automated so that the simulations can be done and analyzed on a larger

time window, creating the set of tests that was needed.

This set of test will be used to validate the small signal stability index in

the case of inter-area oscillations.

Place, publisher, year, edition, pages
2015. , 44 p.
EES Examensarbete / Master Thesis, XR-EE-ES 2015:001
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-160710OAI: diva2:791028
Educational program
Master of Science in Engineering - Electrical Engineering
Available from: 2015-02-26 Created: 2015-02-26 Last updated: 2015-02-26Bibliographically approved

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