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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
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
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
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 ( )
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
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
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
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
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
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
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
e,TT
s
u
t
t
Id
-Id
iR
iT
iS
eR
eT
eS
i
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
April 25, 2011 Electric Railway Traction
7. Other types of propulsion systems
Example synchronous motor drive (France)
April 25, 2011 Electric Railway Traction
7. Other types of propulsion systems
Synchronous motor drive at 1.5 kV DC
April 25, 2011 Electric Railway Traction
7. Other types of propulsion systems
Synchronous motor drive at 25 kV, 50 Hz AC
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