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Low wind
velocity wind turbine MWT-1000A receives international
certification for performance and noise level
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MHI has been given
international certification for its MWT-1000 wind turbines in the categories of
both performance and noise levels.
Testing for the certification was requested of and carried out on the first
unit of the wind turbine constructed in the state of Texas,
U.S.A.,
by the international third party wind turbine testing organization known as
NREL (National Renewable Energy Laboratory). Test results showed that figures
for both performance and noise levels stood at satisfactory levels, as was
expected prior to testing.
The performance test was implemented in accordance with IEC (International Electrotechnical Commission) rules on performance as
stipulated in section 61400-12 (see Figure 1). Results were
positive, indicating that output stood at a maximum of 12% higher than
planned values (wind velocity of 5 m/s) and an average of 6% higher (wind
velocity of 5-12 m/s, see Figure 2), thereby
warranting international certification for wind turbines performance (see Figure 3).
As for noise levels, testing was based on IEC 61400-11, the section on noise
testing, yielding noise power levels of 100.8 dBA
for wind velocity of 8 m/s, which corresponded to planned values (see Graph 1 and Figure 4). International certification in
wind turbines noise levels was thereby awarded based on these results (see Figure 5).
As shown in Figure 6, MMI’s
wings feature a knife edge at the tips, while the trailing edges are of the
sharp variety. Tests shows that this design enables shifting and offsetting
of the phase angle curl created by the wing’s trailing edge, and thereby
reduces noise.
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