Download - Current Source inverter T D4 D6 D2 - KTH
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April 25, 2011 Electric Railway Traction
7. Other types of propulsion systems
Current Source inverter
R
S
T
T1
T2
T3
T4
T5
T6
D1
D2
D3
D4
D5
D6
Id
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a)
R
S
T
T1
T2T6
D1
D2D6
–C
Id
+
Id
b)
R
S
T
T1
T2T6
D1
D2D6
C
Id
–
+
Id
c)
R
S
T
T1
T2T6
D1
D2D6
C
Id
Id
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u c
-u c
u ci
t r = turn-off time
t 1 t 2
i
t c = total commutation time
t
t
diode commutation
i T
i S i T
i S
-I d
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April 25, 2011 Electric Railway Traction
7. Other types of propulsion systems
Motor voltage when power is supplied from a current source inverter
uST
t
terminal voltage u ST ( )
voltage, lower capacitor group u CST ( )
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April 25, 2011 Electric Railway Traction
7. Other types of propulsion systems
Machine quantities at steady-state
torque T
phase voltages
phase curents
t
t
e R e S e T
i T i R i S
s
I d
-I d
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April 25, 2011 Electric Railway Traction
7. Other types of propulsion systems
DC voltage fed system with input converter and current source inverter
Motor
Generator
R
S
T
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April 25, 2011 Electric Railway Traction
7. Other types of propulsion systems
Synchronous motor drive with current source inverter
eR,S,T
T1
T2
T3
T4
T5
T6
uR
S
T
dI dL
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April 25, 2011 Electric Railway Traction
7. Other types of propulsion systems
The mmf wave’s six directions
T1-T6
T5-T4
T3-T4
T3-T2
T1-T2
Fr
T5-T6
s
sF
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April 25, 2011 Electric Railway Traction
7. Other types of propulsion systems
Voltages and torques under ideal conditions
T1
T2
T3
T4
T5
T6
induced stator voltages
e R e S e T
excitation sequence, upper thyristor group
excitation sequence, lower thyristor group
t 1 t 2 t 3 t 4 t 5 t 6
T= u d I d s
u d
s t
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April 25, 2011 Electric Railway Traction
7. Other types of propulsion systems
Commutation from thyristor T1 to thyristor T3
R
S
T
T1
T2
T3 R,S,Te
RSe
Id
RiSi
Id
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e R e S e T
s t
t
commut at ing
volt age
e R S = e R - e S
e R S at no-load
i R
i S
i S
i R
= current delay angle
u = overlap angle
t hyrist or’s reverse recovery t ime
( tq)
respect angle
t T 3
t
t u
t 3
s t
Induced phase voltages
Possible commutation interval
current
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e,TT
s
u
t
t
Id
-Id
iR
iT
iS
eR
eT
eS
i
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DC link pulsation and forced commutation
1'
2'
3'
4'
1
2
3
4
5
6
1
2
3
4
5
6
Thyr com1
Thyr com2
+ - T1
T4
T1'
T4'
Id
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April 25, 2011 Electric Railway Traction
7. Other types of propulsion systems
Example synchronous motor drive (France)
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April 25, 2011 Electric Railway Traction
7. Other types of propulsion systems
Synchronous motor drive at 1.5 kV DC
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April 25, 2011 Electric Railway Traction
7. Other types of propulsion systems
Synchronous motor drive at 25 kV, 50 Hz AC