profiling the next generation of multi mw wind turbines
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The Next Generation of Multi MW Turbine Technology
By Colin Pawsey
The wind industry is faced with big challenges over the next decade, with a pressing
need to reduce the initial investment needed to construct wind farms, and the cost
of energy (CoE) produced by them. The natural move is to develop much larger
wind turbines that are able to take advantage of the stronger winds further out to
sea, and produce more energy more efficiently.
With the first projects utilizing giant turbines in the 5MW+ class expected to begin
construction in 2017/2018, developers are in the process of specifying which
turbines they will use. Several manufacturers have turbines in development ranging
from 5MW to 10MW, and this is a good opportunity to profile some of the giant
turbines which we may see in European waters in the next few years.
Samsung S 7.0-171
The Samsung Heavy Industries S 7.0-171 has a rated power capacity of 7MW, and
the first prototype was installed in 2013 in the Fife Energy Park off the coast of
Scotland. It is expected to be commercially available by 2015, and Samsung say
that it has been designed for best-in-class performance, high reliability, easy
maintenance, and a 25-year service life.
Each of the blades is 83.5 metres in length, with a total rotor diameter of 171.2
metres at a hub height of 110 metres. The gearbox design is reinforced by evenly
shared load distribution to the planet gears and a lightweight design using flexpin
technology in conjunction with torque split gear planet stage arrangement. The
modular gearbox design allows for convenient maintenance.
The turbine uses a medium voltage (3.3kV) permanent magnet generator, and a
medium speed (400RPM) drive train with a lighter, shell type main frame structure
and compact design because gear stages are located inside the main shaft.
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IQPC GmbH | Friedrichstr. 94 | D-10117 Berlin, Germany
t: +49 (0) 30 2091 3 274 | f: +49 (0) 30 2091 3240 | e: [email protected] | w: www.iqpc.de
Visit IQPC for a portfolio of topic-related events, congresses, seminars and conferences: www.iqpc.de
Siemens SWT-6.0-154
SWT-6.0-154. Source: Siemens
Siemens has built on the success of its SWT-3.6-120 turbine, by introducing the
SWT-6.0-154 6MW turbine. Three of the turbines were installed at the Hunterston
test site in the UK in 2013, and Siemens is set to supply 300 of the giant turbines
for wind farms off the coast of the UK between 2014 and 2017 as part of an
agreement with Dong Energy.
The blades on the turbine are 75 metres in length, and the rotor diameter is 154
metres. The turbine is based on Siemens Direct Drive technology and has 50%
fewer moving parts than comparable geared turbines. The main elements of the
synchronous direct drive PMG generator are scaled up versions of the 3MW
generators used in Siemens previous turbines, while the converters are identical;
the larger turbine simply uses two 3MW converters side by side.