Ppt

1. SHRI SAI POLYTHECNIC,
CHANDRAPUR
SUBJECT :- EPT
TITLE :- Flexible AC Transmission
System Overview
PROJECT GUIDE :-
Prof. Mayur Tamboli Sir
DEPARTMENT OF ELECTRICAL
ENGINEERING
MICROPROJECT
Submitted By :-
1. ABHINAV TAMGADGE
2. DHAMMADEEP WAGHMARE
3. ADITYA BHUJBALE

2. Flexible AC Transmission
System Overview

3. Flexible AC Transmission System
Alternating current
transmission systems
incorporating power
electronics-based and
other static controllers
to enhance
controllability and
increase power transfer
capability

4. Constraints on Useable Transmission
Capacity
 Dynamic:
 Transient and dynamic stability
 Subsynchronous oscillations
 Dynamic overvoltages and undervoltages
 Voltage collapse
 Frequency collapse

5.  Steady-State:
Uneven power flow
Excess reactive power flows
Voltage capability
Thermal capability

6. FACTS Controllers
 Static VAR Compensator - SVC
 Thyristor Controlled Series Compensator - TCSC
 Thyristor Controlled Phase Angle Regulator - TCPAR
 Static Synchronous Compensator - StatCom
 Solid State Series Compensator - SSSC
 Unified Power Flow Controller - UPFC

7. US FACTS Installations
San Diego G&E/
STATCOM/100 MVA
Mitsubishi
Eagle Pass (Texas)
Back-to-back HVDC
37 MVA/ ABB
CSWS (Texas)
STATCOM/ 150 MVA
/ W-Siemens
Austin Energy
STATCOM/ 100MVA
ABB
AEP/ Unified Power
Flow Controller
/100 MVA/ EPRI
TVA
STATCOM/ 100MVA
EPRI
Northeast Utilities/
STATCOM/ 150 MVA/
Areva (Alstom)
NYPA/ Convertible
Static Compensator/
200 MVA
Vermont Electric/
STATCOM/ 130
MVA/ Mitsubishi

8.  Power transfer between areas can be affected by
adjusting the net series impedance.
 Transmission line capability can be increased by
installing a series capacitor which reduces the net
series impedance.
Power Flow Control

9. UPFC

10. UPFC
 may control voltage, impedance, and angle
 impacts active and reactive power flow in
line

11. Basic Operation

12. UPFC Capabilities
 Increase transmission line capacity
 Direct power flow along selected lines
 Powerful system oscillation damping
 Voltage support and regulation
 Control of active and reactive power flow at both sending-
and receiving-end

13. Operation
 Reactive power is generated or absorbed by the shunt inverter to
control bus voltage
 Reactive power is generated or absorbed by the series inverter to
control the real and/or reactive power flow on the transmission line

14. Cont’d
 A portion of the real power flow on the transmission line is drawn from the
bus by the shunt inverter to charge the DC capacitor.
 Real power is inserted into the line through the series inverter.

15. jX
S
V R
V
SR
P
sin
S R
SR
V V
P
X


Power flow in a transmission line

To increase PSR, increase
and R S
V V jXI
 
jXI
S
V
R
V


16. A
V B
V
inj
V
- +
A
V
inj
V
B
V

jX
S
V R
V
SR
P
R
V
inj
V
- +  
sin
S R
SR
V V
P
X
 


 
jXI
inj
V
S
V
R
V



17. How is Vinj created?
V
+
b1
a2
a1
b2
c1
c2

18. V
+
b1
a2
a1
b2
c1
c2
a1 on, b1 on, c1 off
Vab=0, Vbc=V, Vca = -V
a1 on, b1 off, c1 off
Vab=V, Vbc=0, Vca = -V
V
+
a1 b1 c1
c2
b2
a2
V
+
a1 b1 c1
c2
b2
a2
a1 on, b1 off, c1 on
Vab=V, Vbc=-V, Vca = 0

19. Sine-triangle PWM
0 100 200 300 400 500 600 700
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0 100 200 300 400 500 600 700
0
0.5
1
V
a
0 100 200 300 400 500 600 700
0
0.5
1
V
b
0 100 200 300 400 500 600 700
-1
0
1
V
ab
THANK YOU