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A New Fault Diagnosis Approach for Brushless Doubly Fed Machines for Wind Turbine Generator Applications

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@B05.@<=A60.9@A?.6;:2.@B?2:2;A@5.C2/22;12C29<=213<?
:<;6A<?6;4 /9.12 6;A24?6AF <D2C2? A52@2 .?2 .9@<
2E=2;@6C2.;1?202;A?296./696AF @B?C2F@,-5.C2@5<D;A5.A
A52 2920A?60.9 @F@A2:@ 5.C2 . 56452? 3.69B?2 ?.A2 A5.; A52
:205.;60.9@F@A2:@
'52?2.?2 <;9F 32D @AB162@ 0.??621<BA <; 3.B9A 16.4;<@6@
<3 A52 ! :<@A9F <; C6/?.A6<; .;.9F@6@ .;1 :6A64.A6<;
<4.;2A.9,-12?6C212>B.A6<;@3<?C6/?.A6<;0<:=<;2;A@
:.4;6AB12@42;2?.A21/FA52$*.;1*:.4;2A6036291@.@
3B;0A6<;@<3 .6?4.=39BE12;@6AF=<92 ;B:/2?@ .;1:.056;2
16:2;@6<;@ /16 2A .9 6; ,- =?<=<@21 . ;2D =.?.9929
D6;16;4 12@64; 3<? A52 @A.A<? $* .;1 * A< :6A64.A2 A52
C6/?.A6<; 92C29 6; A52 =?2@2;02 <3 ?<A<? 2002;A?606AF <??299
2A .9 6; ,- =?<=<@21 . ;B:/2? <3 ?<A<? 12@64;@ D6A5
@B6A./92@A.A<?=<92=.6?0<:/6;.A6<;@6;<?12?A<6:=?<C2A52
! 12@64; /F ?21B06;4 A52 B;/.9.;021 :.4;2A60 =B99
(!$ 3@5.? 2A .9 6; ,- ?202;A9F =?<=<@21 . ;2D 3.B9A
12A20A6<;A205;6>B2/.@21<;A52:.056;2I@0B??2;A@64;.AB?2
.;.9F@6@ A< 12A20A ?<A<? 2002;A?606AF 3.B9A@ 6; A52 ! ;
,-.;2D:2A5<1D.@=?<=<@216;<?12?A<12A20AA52@A.A<?
D6;16;4 @5<?A 06?0B6A 3.B9A@ 6; A52 ! /F .;.9F@6;4 A52
;2@A21 9<<= ?<A<? @9<A 5.?:<;60@ @22; 6; A52 @A.A<? 0B??2;A@
;,-.;.;.9FA60.9:2A5<1<3A52!D6A5/?<82;?<A<?
9<<=@.;12;1?6;4@D.@ =?2@2;A21 "2C2?A5292@@ 6; ;<;2 <3
A52./<C2D<?8D.@.42;2?60A205;6>B23<?12A20A6;4C.?6<B@
AF=2@ <3 3.B9A@ 6; A52 ! .@ . D6;1 AB?/6;2 42;2?.A<?
=?<=<@21
*.A@<;2A .9 ,- 5.C2=?<=<@21 ;<C29 !&A205;6>B2@
/.@21 <; A52 0<;A6;B<B@ D.C292A A?.;@3<?: *' <3 A52
42;2?.A<?I@ 2920A?60.9 =<D2? @64;.9 A< 12A20A 6;16C61B.9
C6/?.A6<; 3.B9A@ A5.A <00B? 6; 2.05 :205.;60.9 0<:=<;2;A
D6A5 /<A5 3?2>B2;0F .;1 A6:2 1B?.A6<; F 0<:=.?6;4 A52
?2.9A6:2C6/?.A6<;D.C23<?:@</A.6;213?<:A52 *' D6A5
. =?2C6<B@ 0.90B9.A6<; A52 3.B9A .;1 6A@ @=206360 3?2>B2;0F
:.F/2 12A20A21 '56@A205;6>B26@@A699 6; A52?2@2.?05@A.42
.;1 5.@ <;9F /22; .==9621 A< 42;2?.A<?@ 6; . 9./<?.A<?F
2;C6?<;:2;A/BA6A1<2@.==2.?A<<332?@64;6360.;A.1C.;A.42@
0<:=.?21 A< A?.16A6<;.9 A205;6>B2@ <? 6;@A.;02 6A B@2@
2E6@A6;4 @2;@<?@ .C.69./92 6; :<@A 42;2?.A<? @F@A2:@ A<
:2.@B?2 2920A?60.9 @64;.9@ '52?23<?2 6A D<B91 /2 . ;<;
6;A?B@6C2:2A5<1D6A52.@F6:=92:2;A.A6<;.;1;<.116A6<;.9
0<@A@ ; .116A6<; A52 @=206360 3?2>B2;062@ .@@<06.A21 A< A52
3.B9A .@ D299 .@ A52 A6:2 A5.A A52 3.B9A <00B?@ 0.; /2
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2920A?60.9 .;1 :205.;60.9 3.B9A@ <00B??21 6; . D6;1 AB?/6;2
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D6129F @AB1621 , - A< A52 /2@A <3 A52 .BA5<?@I
8;<D92142 ;< D<?8 5.@ /22; ?2=<?A21 6; .==9F6;4 A56@
A205;6>B2A<A52!
; A56@ =.=2? A52 =?.0A60.96AF <3 A52 *' :2A5<1 6;
12A20A6;4 C.?6<B@ 3.B9A@ 6; A52 ! 6@ .@@2@@21 
@6:B9.A6<; :<129 6@ 12C29<=21 6; !' &6:B96;8 3<? .
=?<A<AF=2   8*! .;1 6A@ .00B?.0F 6;
=?2160A6;4 A52 :.056;2I@ =2?3<?:.;02 .A 16332?2;A <=2?.A6;4
0<;16A6<;@ 6@ C.961.A21 B@6;4 2E=2?6:2;A.9 A2@A@  D.C292A
/.@21 .1<=A6C2 369A2? 6@ 12@64;21 .;1 6:=92:2;A21 <; A52
@6:B9.A6<;:<129@6;<?12?A<?21B02A520<:=BA.A6<;.9A6:2
'5?22 16332?2;A 3.B9A AF=2@ ;.:29F A52 A<?>B2 =2?AB?/.A6<;
?<A<? /?<82; /.? .;1 4?61 <C2?C<9A.42 3.B9A@ .?2 /26;4
0<;@612?216;A56@D<?86;<?12?A<.@@2@@A52=?.0A60.96AF<3
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<? 0<:=?2@@6;4 . 3B;0A6<; 6@ ?232??21 A< .@ H@0.96;4I F
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0<:=92E0<;7B4.A2
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D.C292A 3B;0A6<; '< 6;0?2.@2 A52 0<2336062;A .:=96AB12@
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Fig. 9. The nested loop rotor configuration showing the broken bar.
Fig. 10. Rotor bar currents at the event of rotor broken bar fault shown in
Fig. 9.
15 20 25 30 35 40 45 50 55
600
610
620
630
640
Speed (rev/min)
15 20 25 30 35 40 45 50 55
-4
-3.5
-3
Torque (kNm)
15 20 25 30 35 40 45 50 55
Time (s)
160
180
200
220
P output power (kW)
Fault # 3
Fault # 2
Fault # 1
0 1020304050607080
Frequency (Hz)
0
100
200
300
400
500
600
700
800
900
1000
|Y(f)|
10 Hz fault
50 Hz fault
Broken bar
Normal nested -loop Nested-loop wit h broken bar
15 20 25 30 35 40
-500
0
500
Rotor Bar 1
15 20 25 30 35 40
-500
0
500
Rotor Bar 2
15 20 25 30 35 40
-500
0
500
Current (A)
Rotor Bar 3
15 20 25 30 35 40
-500
0
500
Rotor Bar 4
15 20 25 30 35 40
Time (s)
-500
0
500
Rotor Bar 5
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