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Transcript of 13265 a 0214
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Doubly Fed InductionGenerators in Wind
power generation
Prepared by: R.Rakesh Goud
[1326!021" ]
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Introduction
• #oub$y %ed e$ectr&c mach&'es are e$ectr&c
(e'erators that ha)e *&'d&'(s o' stat&o'ary
a'd rotat&'( parts.
• +here both *&'d&'(s tra's%er s&('&%&ca't
po*er bet*ee' sha%t a'd e$ectr&ca$ system.
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• ,he pr&'c&p$e o% the doub$y %ed &'duct&o'
(e'erator &s that rotor *&'d&'(s are
co''ected to the (r&d )&a s$&p r&'(s a'd
back to back )o$ta(e source co')erters thatco'tro$ both rotor a'd the (r&d curre'ts.
• Rotor %re-ue'cy ca' %ree$y d&%%er %rom the
(r&d %re-ue'cy 0 or 60 • y us&'( the co')erter to co'tro$ the rotor
curre'ts.
PRINCIPLE OF DFIG
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t &s poss&b$e to adjust the act&)e a'd react&)e
po*er %ed to the (r&d %rom the stator a'd th&s &s&'depe'de't o% the rotat&'( speed o% the
(e'erator.
' a three phase sy'chro'ous (e'erator *&tha' eter'a$ mecha'&ca$ source pr&me mo)er
Rotat&'( the (e'erator rotor ,he ma('et&c
%&e$d &' the (e'erator rotor created by the dccurre't %ed &'to the rotor *&'d&'( rotates at the
same speed as the rotor.
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• !s a resu$ts a co't&'ua$$y cha'(&'(
ma('et&c %$u passes throu(h the stator*&'d&'(s &'duc&'( a' a$ter'at&'( )o$ta(e
across the stator *&'d&'(s &'duc&'( a'
a$ter'at&'( )o$ta(e across the stator
*&'d&'(s.
• ,he mecha'&ca$ po*er app$&ed to the
(e'erator sha%t by the pr&me mo)er &s
co')erted to e$ectr&ca$ po*er &' the stator*&'d&'(s.
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• ' co')e't&o'a$ &'duct&o' (e'erators the
re$at&o' bet*ee' the rotor speed a'd the
%re-ue'cy o% the ac )o$ta(es &'duced across
the stator *&'d&'(s o% the (e'erator &s
epressed us&'( e-uat&o'
• 4re-ue'cy o% the ac )o$ta(es &'duced
across the stator 5 speed o% the rotor
'umber o% po$es &' the (e'erator per
phase/120 .
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• the operat&'( pr&'c&p$e app$&cab$e &' a #4G
&s the same as see' &' a co')e't&o'a$
&'duct&o' (e'erator.• ,he o'$y d&%%ere'ce &s that the ma('et&c %&e$d
*h&ch &s created &' the rotor &s 'ot stat&c 8as
&t created us&'( three phase ac curre't&'stead o% dc curre't9.
• ,he ma('et&c %&e$d pass&'( throu(h the
(e'erator stator *&'d&'(s 'ot o'$y rotatesdue to the rotat&o'a$ e%%ect produced by ac
curre'ts %ed &'to the rotor *&'d&'(s.
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• +he' the ma('et&c %&e$d o% the rotor rotates
&' the same d&rect&o' as the (e'erator rotor
• ,he rotor the speed o% rotor a'd the speedo% the rotor ma('et&c %&e$d add up.
• ,he %re-ue'cy stator o% the )o$ta(e
&'duced across the stator *&'d&'( o% the(e'erator ca' be ca$cu$ated
• 4re-ue'cy o% the stator 5 speed o% the
rotor 'umber o% the po$es/120 ; %re-ue'cy
o% ac curre't s %ed &'to the #4G .
<
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• +he' the ma('et&c %&e$d at the rotor rotates
&' the d&rect&o' oppos&te to that o% the
(e'erator rotor the rotor ma('et&c %&e$dsubtract %rom each other.
• 4re-ue'cy o% the stator
5 speed o% rotor
'o o% the po$es/120 = %re-ue'cy o% the ac
curre'ts %ed &'to the #4G.
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– +, +N# ,>RN?@
– ,he d&%%ere'ce bet*ee' a re(u$ar
asy'chro'ous (e'erator a'd a #4G
– s that the pr&or &s rotor ec&ted *here the
$atter &s eter'a$$y ec&ted *&th a'
acAdcAac co')ertor.
–+here the rotor speed &s (reater tha' the
e$ectr&ca$ sy'chro'ous speed o% the stator
the s$&p &s 'e(at&)e a'd the rotor de$&)erse$ectr&c e'er(y to the e$ectr&c (r&d due to
the super sy'chro'ous (e'erat&'( mode.
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• % the s$&p &s pos&t&)e the rotor rece&)es
e$ectr&c e'er(y %rom (r&d but the stator keeps• B' de$&)er&'( e$ectr&c e'er(y to the (r&d th&s
&s subAsy'chro'ous (e'erat&'( mode.
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Suary
• >s&'( a #4G &'stead o% a' asy'chro'ous
(e'erator &' *&'d turb&'es o%%ers the
%o$$o*&'( ad)a'ta(es:
• 1. the amp$&tude a'd %re-ue'cy o% the)o$ta(es rema&' co'sta't *h&$e operat&'( at
)ar&ab$e speed.
• 2. the amou't o% po*er (e'erated as a%u'ct&o' o% the a)a&$ab$e *&'d po*er &s
opt&m&sed .
1"
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• 3. sudde' )ar&at&o's &' the rotor tor-ue a'd
(e'erator output po*er &s )&rtua$$ye$&m&'ated.
• ".e$ectr&ca$ po*er (e'erat&o' happe's e)e'
at $o*er *&'d speeds.• . *&$$ be ab$e to co'tro$ the po*er %actor8 &'
order to ma&'ta&' the po*er %actor at u'&ty.
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!"#N$ %O&
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