Dear Researcher,

I have to give a power point presentation on Wind Generation
Technology. In more detail I have to provide structured information of
the various A.C. Machines (especially Induction Machines and Permanent
Magnet Synchronous Machines) as employed in generating Electrical
Energy from Wind Energy, that is Wind Generation Plants.

I wish to be given sequential information of the whole cycle of the
generation process, that is from  the Wind Turbine blades to
connection of the plant with the infinite busbar. Links to websites
where I will find such info will also be appreciated!

Whilst looking forward for your reply, I thank you in advance.

Patrik73-ga

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Request for Question Clarification by hedgie-ga on 26 Nov 2002 02:29 PST

Hi Patrick

          The confusing part of the question is the phrase
 
'wind generating' - while it seems you want to generate electric power,
not wind,  as decribed e.g. here:
http://www.eren.doe.gov/windpoweringamerica/

 by using a windturbine, as described here:
http://www.eren.doe.gov/wind/feature.html

  It is also not clear on what level (k12, high-school,.. level) is the 
 material to be presented.

 Are you interested in commercial (large scale windfarms) or small, 
 (farmhouse) turbines, which can be purchased for soem $5000 and up,
or in general priciples, which do not depend on the scale?

hedgie

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Clarification of Question by patrik73-ga on 27 Nov 2002 18:03 PST

Dear Hedgie/Neil,

Thanks for your prompt response and sorry for the delay, but I had
some problems with the password. Here come my clarifications!

(1) It is obviously about generating electric power through wind
energy.

(2) The presentation is intended for University Students.

(3) The presentation is intended to put forward the general principles
of the types, features and characteristics of a.c. machines employed
in wind energy generation. However it has to oriented on large scale
windfarms rather than domestic applications.

(4) By the 'Infinite Busbar' I mean the 'Grid', correct!

(5) The two types of machines I have to focus upon are the 'Induction'
and the 'Permanent Magnet Synchronous'. By the term 'synchronous' it
is meant that the rotor and stator field are in synchronisation.
Whereas in the Induction Machine, the rotor lags the stator field by
the slip speed.

I hope this clarifies the whole picture. Anyway should you have any
other questions I will be happy to assist... and maybe quicker too!

Regards,

Patrik73-ga

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Clarification of Question by patrik73-ga on 03 Dec 2002 17:33 PST

Hi dear Researcher!

My presentation is to be delivered on the 17th of this month. Hence I
would greatly appreciate if I get an answer at the earliest.

At least I would like to know whether I'm gonna be answered or not and
by what date please. Thank you.

Regards,

Patrik73-ga

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Request for Question Clarification by hedgie-ga on 04 Dec 2002 20:59 PST

Hello Patrick

     I am using 'request' so that you get e-mail notification,
but am just answering your last querry : "will I get answered or
not..",
not requesting further notification.  Your question is clear and 
well formulated now. I looked at your clarification and looked briefly
on the net and decided not to proceed.
 Other researches may feel differently.
In my case it is not just question of
https://answers.google.com/answers/faq.html#howmuch

Researches often spend much more time than price would warant since
they are
curious and challenged. In this case the result is rather predictable,
lot
of details and no clear-cut answer.
I would suggest as alternative to the web:  Do borrow a textbook on
power
generators, something like
http://www.amazon.com/exec/obidos/ASIN/0880160330/processassociate/002-5908185-9020033
or other from this list:
http://www.processassociates.com/bookshelf/equipment/electrical_generators_1.htm
This is why:
Not all the technical information is available for free 'on the web'
(as yet).
It looks like you will need to select from a large amount of technical
data
to provide an overview of electric power generation.

hedgie

I have not heard of "the infinate bussbar", can you clarify or add
details. Synchronous can apply to both induction machines and
permanent magnet alternators. Synchronous probably means 300, 360,
600, 900, 1200, 1800, or 3600 RPM = revolutions per minute is the
speed of the rotor, assuming you want 60 Hertz electricity. Small
machines turn at high speed, big wind alternators, at low speed. Some
systems use a transmission so the propeller can turn slower than the
rotor in the alternator. Early wind turbines produced dc electricity,
and were thus properly called wind generators, a term not really
correct if ac power is produced.  Neil

Perhaps the infinite bussbar is what we call the grid. Less than 1% of
the world's locations are cost effective for wind power, and most
require the propeller to be 10 meters = 34 feet, or more off the
ground. Even where all goes better than expected pay back is typically
10 years or more. Neil