
A Large Wind Power System in Almost
Island Operation—A Danish Case Study
Aug. 2007 - Akhmatov, V..; Eriksen,
P.B. - IEEE Transactions on Power Systems, Vol 22,
Issue 3, Page(s):937 - 943
In Denmark, incorporation of wind power into the
power system is increasing whereas power generation
from the large conventional power plants is reducing.
The common concern has become maintenance of reliable
and stable operation of the Danish power system with
a large amount of wind power - the large wind power
system. At present, maintaining the voltage stability
of such a large wind power system relies on strong
ac connections to neighboring power systems with sufficient
reactive power and voltage control and on control
of central power plants in Denmark. This paper presents
the results of a stability investigation carried out
by the Danish transmission system operator (TSO),
Energinet.dk, for the case of almost island operation
of the Western Danish wind power system.
The main ac lines connecting Western Denmark to the
synchronous area of the Union for the Co-ordination
of Transmission of Electricity (UCTE) were out of
service and the wind power generation was high. The
investigation has shown that the reactive power and
voltage control of the domestic power plants is essential
for maintaining short-term voltage stability of the
Western Danish wind power system and becomes even
more relevant when ac connections to the strong transmission
system of the UCTE are out of service. The results
presented in this paper may also be relevant for the
operators of the power systems that are in island
ac operation and with plans for significant commissioning
of wind power - Great Britain, Ireland, Tasmania,
etc.
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