Independent thesis Advanced level (professional degree), 20 credits / 30 HE credits
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
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.
2015. , 44 p.