???:(a)?????(b)?????(c)???

1
????????

• ????
• ????
• ?????
• ???
• ?????????
• ?????????????

2
????????????

• ???(a)?????(b)?????(c)???
• ??????(a)??????(b)DC??(c)AC????
• ??????(H F induction furnaces)
• ???????(1) ???(2) ??????(3) ???? (4)?????(5)
  ???????

3
(1)????(Harmonics)
1th, 2th 4th
4
????(61119 Hz)
????(121179 Hz)
????(181239 Hz)
?????(159 Hz)
?????(2, 3, 4, 5, 7, ...?)
?????(3, 5, 7, 9, 11, .....?)
?????(2, 4, 6, 8, 10, ..?)
?????(3, 6, 9, 12, 15, ...?)
5
????????????

• 6???--?????5, 7, 11, 13, 17, 19, ..6k?1.
• ??????2, 3, 4, ---.
• 12???--?????11, 13, 23, 25, ... 12k?1.
• ??????2, 3 , 4, 5, 7, 17, 19,
  ..
• 18???--?????17, 19, 35, 37, ... 18k?1.
• ??????..5, 7, 11, 13, 23, 25, ..

6
???????????

• n 1 2 3 4
  ... N
• ???? - 4? 7? 10? 3n1
• ????2? 5? 8? 11? 3n-1
• ????3? 6? 9? 12? 3n
• ?? 25???? ? ???
• 25/38? 1----????
• ?? 41???? ? ???
• 41/313? 2----????

7
??????????
8
?????????

• ?????????????????
• ???????????????
• ?????????????????

9
D ???????????????
Ia(h)3, 5, 7, 9, 11, 13, 15, 17,19, ...
IA(h) 5, 7, 11, 13, 17,19,
IA3n IB3n IC3n 0
????????????
10
????

• ????(Positive-sequence harmonics)???(3n1)?????,?
  n1,2,3,.....?
• ???(Negative-sequence harmonics)???(3n-1)??????
• ????(Zero-sequence harmonics)???(3n)??????

11
???????
(??? ? ???,??? ??(?)??)
12
???????????

• n 1 2 3 4
  ... N
• ????4? 7? 10? 13? 3n1
• ????2? 5? 8? 11? 3n-1
• ????3? 6? 9? 12? 3n
• ?? 25???? ? ???
• 25/38? 1----????
• ?? 41???? ? ???
• 41/313? 2----????

13
?????????

• ??????????????
• ?????????????????
• ?????????????????
• ???????????(?????)
• ?????????????????
• ????????(????????)
• ??

14
? ? ? ? ? ?
?????
??????

• ???????(?????) ?
• ???????(????) ?
• ???????(?????) ?
• ???????(?????) ?
• ????????? ?

15
????????
16
Bus K??????
17
?????????????
PLANT B
LINE
PLANT A
IMPEDANCE
11.4 kV BUS
UTILITY
Tr
INDUCTIVE
LOADS
CAPACITOR
220 V BUS
BANK
HARMONIC
SOURCE
CAPACITOR
INDUCTIVE
BANK
LOADS
18
????????????
19
???
20
????????
HARMONICS RECORDING
21
(No Transcript)
22
??????

• ?????????(?12-pulse?24-pulse?IGBT)
• ????????(Passive Filters)
• ???Y-?? Y-Y??????
• ??????(Active Filters)

23
?????- ????????
24
????????????
25
?????- ????????
26
12????????
27
(No Transcript)
28
(No Transcript)
29
????????????????
30
UTILITY
SHORT CIRCUIT CAPACITY 5784 3280 MVA POWER
FACTOR 0.98 SYSTEM QUALITY FACTOR 30
M1
161 kV BUS
100 MVA 161kV/22kV 10.5
CO-GENERATORS 385 MVA
M2
OTHER LOADS 180 MVA
M3
M4
12-Pulse
33 kV BUS
33 kV BUS
2th
3th
4th
9th
2th FILTER 64.2 mH (25)
3th FILTER 40.56 mH (16.5)
4th FILTER 13.55 mH (8.6)
9th FILTER 4.62 mH (1.68)
82 MVA 33kV/650V 20.52
6-Pulse
6-Pulse
15 MVAr
10 MVAr
15 MVAr
8 MVAr
-
?????
700V

31
12-pulse ??????????
32
18????????
33
??6????????
34
?????????????????(A)
35
18????????
36
24-pulse ?????
37
48-PULSE CONVERTER
(b) ????
(a) ????
38
??????????

• ???????(????)
• ????????????(Delta Y)
• ?????(?????????,?????,?????)
• ?????????(???????)
• ?????(??????)
• ?????????????????

39
? ? ? ?
40
??????????
41
??????????
42
?????????

• (1) ????
• (2) ????
• (3) ????
• (4) ????
• (5) ????
• (6) ????

43
??????????

• ????
• ????(?????)
• ???????????
• ???????
• ???????

44
??????????
????
ABB
6.6 kV
1 kV
PQFB
Tie Transformer
Series Capacitor
FUJIACT (??)
PQFA (??)
200 440 V 1442886 A up to 2 MVA
200 400 V 701600 A up to 1.2MVA
45
??????????
??????(QH) (1) 6-pulse ????0.3 (2) 12-pulse
????0.15 (3) ?????(VVVF inverter)?0.6 ??????(QF)
????? QT QH QF
46
????????????
47
????????????
48
?????90?99??????
49
IEEE/519-1992???????
50
11kV??????????
IEEE/519????5
51
????????

• ??????,???2.5??IEEE/519?5???,?????5????
• ???,????????,???????????????????,?????????????????
  ????
• ??????????????
• ??????????, ??????

52
69kV????????
53
11kV??????
54
11.4 kV?????????????
55
????????

• ????????????????,???????????????????????
• ??????????????????,???????????????????(CT)??????
• ?????????????????????

56
?????????3?????
1267 A
300
1026 A
1616 A
227 A
214 A
200
170 A
126 A
??(A)
100 A
67 A
83 A
100
100
28 A
39 A
36 A
11.5 A
27 A
25 A
A??
0
B??
1
3
C??
5
7
11
13
ITHD
????
57
???220 V??3????????????
58
(No Transcript)
59
??????????
60
?????????
61
????????????

• ???3?(??)???????
• ????????????
• ????????????????
• LC?????????????????