Environmental Engineering Reference
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can be lost in less than twenty years. In 1975, everything about J.
Juul's pioneering principles had apparently been forgotten, even
despite the fact that the Gedser windmill (in Falster) had been
made ready for experimental service again.
The Swedish windmill from Vindkraftbolaget in Sollentuna,
that was to be installed in Kolding had been constructed by engineer
Ivan Troeng. It had 8 kW and two blades with an 8 m span. The
price, as well as the annual production, was sensational. The cost
would be DKK 10 000 (EUR 1 400) when placed on a 10 m tower,
and the annual production was calculated at 16
000 kWh in
Kolding! On the West coast at 10 000 kWh more! That would mean
a price of 8 øre/kWh (EUR 0.011) or one-third of the electricity
price of power utilities, which was then 27 øre (EUR 0.035).
Such figures startled all Danes interested in wind power.
Other windmills cost 3 to 10 times as much, and now it was
suddenly possible to predict a triumphal progress for wind power.
But not everybody fell flat. “A check of the price of the Swedish
company to make sure that a comma has not been placed wrong
must be an absolute necessity,” said manager Jean Fischer to the
Danish
Academy
for
Technical
Sciences
(ATV),
according
to
Information
. The price was found to be correct, but utopian, and
after that, silence descended on the Swedish windmill. Danish
manufacturers could breathe freely; there would be no Swedish
entry on the Danish market.
The principle of the connection to the grid and the asynchronous
generator had been launched in a manner that anybody could
understand. About Ivan Troeng's windmill, architect Claus Nybroe
wrote in
that “the wind power system based on the
asynchronous generator principle, has a great future. This is a
technology that can be mastered by a great number of smaller
enterprises all over the country.” Claus Nybroe has been proved
perfectly correct.
The entire later Danish windmill industry including Vestas,
Nordtank, etc. became technically tied up with the asynchronous
generator principle. And we must be grateful to Troeng from
Sweden, because he reminded us of its advantages. Almost 20 years
later, an alternative appeared in the shape of the synchronous
ring generator, as a rival to the asynchronous principle with
the advantages of the asynchronous generator's but without its
evident drawbacks.
Information
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