Siemens Connecting wind power to the grid User Manual
www.siemens.com/energy
Connecting wind power to the grid
Gas-insulated medium-voltage switchgear for wind farms
Answers for energy.
Wind power is booming –
now and in the future
Installed wind power capacity worldwide
250.0
200.0
150.0
100.0
74.1
59.0
50.0
31.2
24.3
0
2001
2002
39.3
2003
47.7
2004
2005
2006
93.9
2007
120.9
2008
159.2
Source: WWEAInstalled power in gigawatts (GW)
2009
203.5
Prognosis
2010
The international targets for reducing
greenhouse gases have led to a boom in
renewable energies, with a special focus
on wind power. Since the start of the
new millennium, the newly installed
capacity has increased by up to 30 percent per year. The European Union’s goal
is to obtain 20 percent of generated
electricity from renewable energy sources
by 2020, with the largest share coming
from wind power at almost 35 percent.
To reach this goal, new wind power
capacities with a total output of around
100 GW need to be installed in the EU
by 2020.
Market prospects are also promising in
other parts of the world. The need and
demand for wind power is constantly
growing, not just in industrialized but
also in emerging countries.
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The ideal choice
for every application
Gas-insulated medium-voltage switchgear (GIS) are used for various applications in wind farms. Depending on
the operator’s requirements, different
configurations of medium-voltage GIS
allow the individual wind turbines to
be safely connected to the wind farm’s
own power grid.
Cables transmit the generated power
to a collector substation where another
medium-voltage GIS protects the wind
farm on the one hand and the power
transformer on the other, and therefore
ensures a safe connection of the
sustainably generated power to the
high-voltage transmission grid. Within
larger wind farms, reactive power compensation is used to minimize reactive
power flow. This system is also connected
with the wind farm via gas-insulated
medium-voltage switchgear.
Typical layout of wind farms
Double-T connection
Collector
substation
Single-T connection
Arrangement of the gas-insulated medium-voltage switchgear in wind farm applications
Ring connection
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