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Department of Electrical
Engineering, IT and
Cybernetics
2015-2017
Simulation of Load and
Fault Scenarios in a
Hydropower System
with Island Grid
Supervisor:
Dietmar Winkler
Kim Andre Aars
MASTER THESIS
Background
The Westfjords area of Iceland is connected
to the national power grid with only one
transmission line. Due to harsh weather
conditions in the area, the reliability of the
power supply is poor. The transmission lines
have been refurbished, but this is insufficient. To
improve the conditions, power production inside
the area needs to be increased as the loads are
larger than the production. The largest power
station in the area is Mjólká; this power station
consists of 3 generator units with a capacity of
approximately 10 MW. It is therefore of interest
to study the characteristics of the units during
faults in the transmission line. Dynamic models
of the Mjólká generator units and the Westfjords
transmission system are implemented using
the Modelica modelling language. The loads in
the area are represented by three lumped loads.
Scenarios to investigate
•
Which sequence of disconnection of the
loads gives the quickest stabilization of
the voltage and frequency in the islanded
system,
•
Is it possible to improve voltage and
turbine regulation to keep system stable,
•
What impact has additional production in
the area.