Transcript The Need for Measurements

National Institute of Science & Technology
Technical Seminar-2004
Unified Power Flow Controller
Under the guidance of
Mr. Debashisha Jena
Mirza Belal Baig
National Institute of Science & Technology
Technical Seminar-2004
INTRODUCTION
Two main objectives of FACTS
Increase the TX capability of AC line
Control of power flow over the TX routes
UPFCs - most effective FACTS device
UPFC – a device which control TX line
impedance, voltage and phase angle
Mirza Belal Baig
[2]
National Institute of Science & Technology
Technical Seminar-2004
BASIC CONSTRUCTION OF A UPFC
Consists of two switching GTO converters
Shunt-connected
Series-connected
Both converters can operate in a rectifier mode
or in an inverter mode
A DC branch links these two converters by a
storage capacitor.
Mirza Belal Baig
[3]
National Institute of Science & Technology
Technical Seminar-2004
OPERATING PRINCIPLE
Mirza Belal Baig
[4]
National Institute of Science & Technology
Technical Seminar-2004
Operating Principle
Conceptually, a generalized SVS
Converter2 injects a voltage Vpq with phase
angle ρ in series with TX line via an insertion
transformer
Main function of converter1 is to supply the real
power demanded by converter2 at the DC link
No reactive power flow through DC link
Mirza Belal Baig
[5]
National Institute of Science & Technology
Technical Seminar-2004
TX control capabilities
Vpq = ±ΔV (ρ = 0).
Vpq = Vб
Mirza Belal Baig
Vpq = Vq
Vpq = ΔV + Vq + Vб
[6]
National Institute of Science & Technology
Technical Seminar-2004
Phasor representation of the UPFC
Basic asumption (Vpq =0)
P0(δ) = {V2/X} sin δ = sin δ
Q0(δ) = Q0r(δ) = -Q0r(δ) = {V2/X}{1-cos δ } = I-cos δ
Q0 r    1  1  P0  
2
Q0r    1  P0  
2
Mirza Belal Baig
2
1
[7]
National Institute of Science & Technology
Technical Seminar-2004
Phasor representation of the UPFC
For Vpq  0 ,
Mirza Belal Baig
P , p   P0    Qr  ,    Q0r  
2
2
VV pq max 


 X 
2
[8]
National Institute of Science & Technology
Technical Seminar-2004
Conclusion
Most sophisticated power flow controller
Expensive
Gives better performance as compared to
STATCOM,SSSC and TCSC
Provide simultaneous, real-time control of all
basic power system parameters (transmission
voltage, impedance and phase angle) and
dynamic compensation of ac system
Mirza Belal Baig
[9]
National Institute of Science & Technology
Technical Seminar-2004
Mirza Belal Baig
[10]
National Institute of Science & Technology
Technical Seminar-2004
Mirza Belal Baig
[11]