13265 a 0214

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1/30/16 [Project Name] 1 Doubly Fed Induction Generators in Wind power generation Prepared by: R.Rakesh Goud  [1326!021" ]

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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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