인버터의 제어방식과 인버터 적용시 주의해야 할 특징 7/1-04.pdf · 생 토크...
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-
98
1.
,
,
.
.
2.
,
.
1) V/F :
,
, Voltage Frequency
V/F .
(, )
.
2) :
V/F
. TG(
)
.
3) :
1
1
. PG( )
-
2014. 7 99
4
, .
4) :
PG(
) 1
,
PG (Feedback)
.
5) VVC Plus : Voltage Vector ,
PWM
.
3.
.
,
. (, , , MC )
(, )
DC-AC
.
1)
Motor Starter (Soft-Starter)
.
Switching
Converter .
2) Factor
The Cause The Effect
The Current Harmonics
The Current Harmonics
DC or AC Reactor The Current Harmonics
Rectifier Pulse The Current Harmonics
3)
4)
AC
DC
1st
5th
1st+5th
1.5
1
0.5
0
-0.5
-1
-1.5
FundamentalPure singwave
Plus
3rd harmonic
Equals
harmonicallyDestorted Wareform
1
2
-
100
AC, DC
6 Pulse
PWM
,
AC DC
THD( ) 30~40%
4.
4.1
.
1) :
.
2) :
. ,
.
.
4.2
1)
.
( )
b , a
.
3
88% .
43% AC Reactor
37% DC Reactor
35% AC, DC Reactor
12% 6
5% PWM Converterf
P
N
P
N
P
N
P
N
P
N
-
2014. 7 101
,
b
a .
.
, .
2)
, ,
0 .
a) :
.
b) :
,
.
c) :
.
4.3
.
n Tm ,
4
, 1
. 4 (n < 0) .
,
,
Tm > 0 , . , . 3
,
.
Tm < 0, n < 0 . Door
, 1
3 . 2
,
. , 1
, a
, b , ,
a 2 a
, GD2
b .
4 c
d ,
c -> c -> d , 3 .
,
,
4
2
TM TM
aa
c c
b
dTMTM
TL TL
TL
TM0
-
102
,
Trip
.
,
, ,
, , .
10~40%
.
5.
5.1
E 2(AC400V
620V) .
.
5.
6.
DC Link
Utility Line
M
RegenerationEnergy
VVVF
Utility
i = 0
DC Link
Motor
M
Energy Flow
HeatDissipation
R
-
2014. 7 103
(L) (C)
LC Surge
.( 7 )
8
.
, 2
. , tr
.
IGBT tr = 0.1~0.3 s,
tr = 0.3~1 s .
tr = 1 s
.
Surge E .
5.2 Surge
LC Surge
, Surge
. 200V
7.
8.
AC440V
Surg
e
tr = 0.1[]
tr = 0.3[]tr = 0.1[] tr = 1.5[]
tr = 0.2[]
Surge
turn on
3 5.5mm2
Cable (m)
tr
20 40 60 80 90 100 120 140
2
1
DC620V
Surge
-
104
300V
Surge 2
.
400V
600V Surge
.
5.3 Surge
400V Surge
.
1)
- , Surge
.
2) Surge
- Surge
.
:
AC
(dv/dt) Surge
.( 9 )
:
.
6.
6.1 Pump
2 , (H)
, .
)
100m, 80m,
Pump : 1800rpm (4 )
48Hz .
9. Surge
Nmin1 Nmax haho ()
Nmin2 Nmax ha+hlho ()
ho :
ha :
hl :
Pump RPM : 80100
1800 = 1,440rpm
Hz : N = 120FP
F =1,4404
12048Hz
LR
C
-
2014. 7 105
,
,
,
, ,
,
,
.
6.2
, (), ,
,
, .
. ,
25% .
, 30Hz
5~6%
,
.
6.3
(Roter)
(Male roter) (Female roter)
,
.
Loading Time
10
11
12
1
Q-H
ho
Nmin2
Nmin1
hl
ha
Pump
(Q)
(H)
-
106
.
6.4
V/S
,
, , ,
.
Line
, .
Peak
kw
Trip
,
Power .
,
.
13
14
INV Screw Comp
Tank
[Modulation ] [Load/Unload ]
-
2014. 7 107
( )
1 6
Pully
1. Press :
1.
2. 2.
3. () 3.
1. 1.
2.
(, )
2.
3.
8.
,
.
, ,
,
.
15 16
A B C
D
EFGH
1 Peak