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Texas A&M University. T-17 Enhanced Reliability of Power System Operation Using Advanced Algorithms and IEDs for On-Line Monitoring. IAB Meeting, May 18-20, 2005. Participants. Introduction. Project duration: June 1, 2002-May 31, 2005 - PowerPoint PPT Presentation
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PSERC
T-17 Enhanced Reliability of Power System Operation Using Advanced
Algorithms and IEDs for On-Line Monitoring
Texas A&M University
IAB Meeting, May 18-20, 2005
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PSERCParticipants
Academic Team Members
PI: M.Kezunovic (TAMU)
Co PI: A.Abur (TAMU)
S. Meliopoulos (Georgia Tech)
R. Shoureshi (Colorado School of Mines)
Student Team Members
Yang Wu, Luo Xu, Nitin Ved, Goran Latisko, Jun Zhu (TAMU)
Industry Team Members
TVA (M. Ingram), Centerpoint (D. Sevcik), ABB (M. Subramanian), AEP (D. Krummen), Entergy (L. Priez), Mitsubishi (D. Wong), Tri-State G&T Association (A. Mander), TXU (J. Bell), WAPA (P. Kaptain)
3
PSERCIntroduction
• Project duration: June 1, 2002-May 31, 2005
• This is an extension of the previous work on Fault location and State estimation
• This project was aimed at: - Definition of new concept for automated analysis - Development of algorithms - Demonstration through simulation
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PSERCBackground
RAW DATARAW DATA
PROCESSED DATAPROCESSED DATA
IEDsIEDs
Automated Analysis SystemAutomated Analysis System
Remote Control CenterRemote Control Center
VSDBVSDB TSSETSSE FAFLFAFL SSSVSSSV
DFRADFRA DPRADPRA CBMACBMA PQMAPQMA
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PSERCObjectives
• Develop substation automation system which enables: • Integration of data from multiple IEDs• Processing of data at substation level by
implementing novel applications• Sharing of results with other substations
and remote control centers• Develop methods of detecting and
identifying network parameter errors
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PSERCSubstation Developments
Software Architecture
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PSERCSubstation Developments
Software Architecture
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PSERCSubstation Developments
Substation Topology
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PSERCSubstation Developments
Integrated GUI
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PSERCSubstation Developments
Integrated GUI
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PSERCSubstation Developments
IED Data Simulation – Data Flow
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PSERCSubstation Developments
IED Data Simulation – Substation Data Model
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PSERCSubstation Developments
IED Data Simulation – Faults and Switching Sequences
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PSERCSubstation Developments
IED Data Simulation – Errors Insertion
15
PSERC
• Verifies the correctness of substation IED data before they are stored into the substation database. The IEDs can be:• Analog – (currents, voltages) and/or• Digital – (statuses of contacts of circuit
breakers)
Verification of substation database (VSDB)
Substation Developments
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PSERCVSDB - algorithmSubstation Developments
T o p o l o g y l o a d
f u n c t i o n
T o p o l o g y l o a d
f u n c t i o n
I n p u t l o a d
f u n c t i o n
D o u b l e c u r r e n t m e a s u r e m e n t
c h e c k f u n c t i o n
K i r c h o f f ’ s c u r r e n t l a w
c h e c k f u n c t i o n
B r a n c h s t a t u s c h e c k f u n c t i o n
T i m e s e r i e s c h e c k f u n c t i o n
R e p o r t g e n e r a t i o n
T o p o l o g y f i l e C O M T R A D E f i l e s
D a t a f r o m A T P
G R A P H I C A L
U S E R I N T E R F A C E
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PSERC
• Monitors and verifies switching sequences of circuits breakers in the substation
• Traces and concludes what reasons caused extensive switching
Substation Switching Sequences Verification (SSSV)
Substation Developments
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PSERC
SSSV
Substation Developments
Sequence & topologyInformation file
(info.txt)
COMTRADE files(ss.CFG, ss.DAT)
SwitchingSequenceAnalysis
Report file(report.txt)
SequenceInformationDetractor
Detractedswitching
information
OUPUT
Switching Sequence Verification
INPUT INPUT
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PSERC
• Analyzes the protection (relay and circuit breaker) operations
• Verifies data consistency of relay event report and oscillography file
Digital Protective Relay Analysis (DPRA)
Substation Developments
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PSERCDPRA
Substation Developments
Fault Report (local relay)
Setting FilePerformance Specification
Fault Report (remote relays)
Fault Report(other fault analysis
applications)
COMTRADE File
(digital signals)
Event Report
Hypothesis of Protection Operation
Facts of Protection Operation
Disturbance Information
Protection Operation Prediction ES Module
Validation and Diagnosis ES Module
Analysis Report
Validation and diagnosis of relay operation
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PSERCDPRA
Substation Developments
Begin
Fault analysis applications based on advanced algorithms and techniques are
available?
Use disturbance information from
these applications
The local relay indicates Zone 1 fault?
Use disturbance information from the
local relay
Find the remote relay which indicates
Zone 1 fault
Use disturbance information from the
remote relay
Yes
No
Yes
No
Over
Detecting source of disturbance information
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PSERC
• VSDB analysis application• SSSV analysis application• DPRA analysis application• Integrated GUI• Substation Data Model in ATP enabling simulation of CT,
PT, CCVT, CB statuses and DFR data for arbitrary Faults and CB switching sequences
• Substation Topology Description in SCL • Digital Protective Relay Model in C++• Converter from PL4 -> COMTRADE file format• Custom COMTRADE file viewer
Software
Project Deliverables
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PSERC
Documentation
Project Deliverables
• Statement of work
• Functional Requirements
• Implementation Description
• Testing
• Conclusion
• Appendices – demonstration scenarios
PSERC
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Parameter error detection and identification
• Causes:
Network parameters change due to environmental conditions
Network parameters are incorrectly recorded after maintenance
Modeling errors may show up as parameter errors
PSERC
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Parameter error detection and identification
• Effects:
State estimator will generate bad data flags
Good measurements will be incorrectly discarded by the bad data processor
Estimated state will be BIASED !
PSERC
26
Parameter error detection and identification
• Challenge: Suspecting errors in all network
parameters will lead to an exponentially complex problem.
Bad analog measurements may exist simultaneously with incorrect network parameters.
PSERC
27
Parameter error detection and identification
• Proposed approach: Apply the method of Lagrangian which
was previously successfully applied to circuit breaker status error identification.
Develop an automated procedure to account for different types of parameter errors (transmission line parameters, transformer taps, shunt cap/reactance).
PSERC
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Parameter Error Identification Method
et ppp
et
entt ppxcWrrL ,
2
1
n
n
n
n
tn
tn
c
zr
x
C
IH
CWH 0
00
0
0
rS
t
p
p
C
WHS
987
654
3211
EEE
EEE
EEE
G
8
2
E
EHIs n
tsRsr cov
tSrS covcov
Solve for the state variables:
Normalizing λ:
PSERC
29
Numerical Example: 14-bus system
PSERC
30
Numerical Example:Test A: Measurement p45 is wrong.
Test B: Reactance of line 4-5 is wrong.
81.088186.2912
172.8344108.4855
280.2699165.5449
91.35468.5355
109.408414.1172
196.9072256.0877
Test BTest A
Normalized residual / multiplierMeas. or
Constraint
mp45mp24
mp25
45x
24x
25x
PSERC
31
Benefits:
• State vector dimension remains fixed, so even very large scale SE problems can be handled.
• Bad analog measurements and parameter errors can be differentiated.
• No need to pre-specify the suspect parameter.
• Existing WLS state estimator code can be revised to incorporate this capability.
32
PSERCConclusions
• All project goals are accomplished• Deliverables are being prepared (will be
available August 31, 2005)• Software demonstration is available (will
be presented during the poster session)• Sponsors for future field implementation of
the specific scenarios of the proposed concept are found:
- EPRI - Department of Energy - Vendor