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1.
2. The system is aiming in keeping the power
system stability and continuity by regulating
the operation of distance relay during a power
swing and to mitigate the fault current with a
new improved FCL.
3. Power swing is a common disturbance occurring in
power system.
Undesired tripping of the distance relays should be
avoided during the power swing period.
symmetrical fault at the time of power swing which
actually resembles the V & I of swing.
Symmetrical fault during power swing can be
detected by Auto regression method and fault
mitigation can be achieved by SFCL
4. The blocking of distance relays are actually making
large outages in power system.
Large variations in voltage and current are having close
resembles with a symmetrical fault.
Conventional methods are using wavelet transform,
Prony method, travelling wave analysis etc to identify.
Symmetric nature of phase voltages and currents
during the swing makes this task tedious and become
inaccurate with these methods.
5. The method mainly aims at
• Analyzing the present situation.
• Executes the data obtained the data using auto
regression program.
• Predicts the future samples.
• Evaluating the results.
• Initiating the action on distance relay.
6. STUDY ON
POWER
SWING
SIMULATION
WITH
MATLAB -
SIMULINK
ANALYSIS OF
WAVEFORMS
CASE STUDY
ACTION ON
DISTANCE
RELAY
FILTERING
SYMMETRICA
L FAULT
COMPONENT
S FROM
POWER
SWING
APPLICATION OF
AUTOREGRESSIO
N
INTRODUCING
FAULT
MITIGATION
ANALYSIS
WITH
EXISTING
NETWORK
RESULT
ANALYSIS
7.
8. Auto regression is a special technique for
regression analysis.
The technique models nth values of the system
as a function of K previous values.
Higher values of K improves the system
prediction accuracy.
9. The differential components of voltage and
current at any sampling instant of time are
calculated as follows:
10. The rms values of differential voltage and
current are calculated over a period of one
cycle
Where N is the number of samples per cycle
11. The differential power ΔP is calculated from
the rms voltage and current as
19. ROLE OF SFCL
SFCL possessing high stability margin and excellent mitigation
prior to conventional limiters .
Ultrafast operation accomplished with automatic mode change.
Using a superconducting FCL gives an economic advantage, if
technical problems can be solved at lower costs or if the usage of
a FCL makes savings in other equipment possible.
This work deals with possible applications of a superconducting
fault current limiter in a high voltage transmission system
having a simulated power swing and fault.
20.
21.
22. Provided with three fault current path with
internal select option.
The MOV module is indented to work with
heavy fault currents.
An associated spark gap with controlled
triggering is in gang operation with MOV.
23. Virtually no voltage drop in steady state.
Quick response times
Effective current limiting
Detection of fault current with in the first cycle
No impact on voltage and angle stability
No impact on normal operation of relays and
CBs
Relatively low cost and maintenance
24.
25.
26. The initial stage was going through the basic distance relay
mal operation and detection of symmetrical fault during
power swing.
Auto regression based analysis is used to predetermine the
system behavior.
SFCL based fault current mitigation is also inserted to
achieve a more stable network.
The proposed scheme with and without SFCL have been
simulated with MATLAB-SIMULINK
27. Detection of symmetrical fault during power swing is actually a
threat to power system protection.
The initial stage was aiming at the auto-regression based study
of symmetrical fault components during the swing period.
The thesis is thus proposing a SFCL fault mitigation scheme to
assure an improved reliability with the power system network.
The simulated network shows clear role of SFCL in mitigating a
fault and there by improving the stability limits.
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EPRI.
[2] IEEE Power System Relaying Committee of the IEEE Power Eng. Soc., Power
swing and out-of-step considerations on transmission line. Rep. PSRCWGD6, Jul.
2005.
[3] D. Tziouvaras, Relay performance during major system disturbances. 2006.
[4] G. Benmouyal, D. Hou, and D. Tziouvaras, “Zero-setting power swing blocking
protection,” presented at the 31st Annu. Western Protect. Relay Conf. Washington,
DC, 2004.
[5] B. Su, X. Z. Dong, Z. Q. Bo, Y. Z. Sun, B. R. J. Caunce, D. Tholomier, and A.
Apostolov, “Fast detector of symmetrical fault during power swing for distance relay,”
in Proc. IEEE Power Eng. Soc. Gen. Meeting, 2005, vol. 2, pp. 1836–1841.
29. [6] H. Kazemi Karegar and B. Mohamedi, “A new method for fault
detectionNduring power swing in distance protection,” in Proc. IEEE
ECTICON,N2009, vol. 01, pp. 230–233.
[7] X. Lin, Y. Gao, and P. Liu, “A novel scheme to identify symmetrical faults
occurring during power swings,” IEEE Trans. Power Del., vol. 23, no. 1, pp. 73–
78, Jan. 2008.
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occurring during power swings,” in Proc. IEEE Power Eng. Soc. Gen. Meeting,
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