01-pmu in state estimator - msubramanian
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Use of Phasor (PMU) Measurements in State EstimatorMani Subramanian
ABB Network Management
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State EstimatorWith PMU Data
ExistingState Estimator
PMU
RTU
RTU
PMU
PMUSCADA
Front-End/PCU400 SCADA RTDB
PHASORS
WAMS
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⎡−−−−=
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Vθ
H
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PMU
TRAD
PMU
TRAD
Phasor Data Models
Transmission of Phasor Data into SCADA RTDB
PhasorData
Technological Solution to Phasor DataIntegration in State Estimation
Application Integration
Use of Phasor (PMU) Measurements in State Estimator
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Wide Area Monitoring - Local Measurements in Substations
Example: 400 kV S/Sdouble line / double busbar
CT‘s: high accuracy in small current values requires connection to measurement cores
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One PMU heregives state of 4 buses.
EII
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SE using state vectors
CONFIDENTIAL
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Timestamp accuracy: 1 microsecondAbsolute angle accuracy error: < 0.1 degreeCT/VT: 0.2 …0.5%
Highly accurate Phasor Measurements…
…provide the basis for WAM / WAP
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Technical Highlight Time-aligned and synchronized PMU data are used by SE.
Integrated the following PMU data in SE:Voltage angle on a bus 1/
Voltage angular difference between two buses 2/
Voltage magnitude on a bus
Current angle on a branch 1/
Power factor angle on a branch 2/
Current magnitude on a branch
Estimated the artificial reference angle for the PMU measurementsystem 1/
Integrated PMU in the robust Orthogonal SE solution algorithm1/ An invention disclosure has been filed on this feature2/ Another invention disclosure has been filed on this feature
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Addition of PMUs
PMUs were artificially deployed in the baseline power system with increasing levels of penetrations (LOPP).
PMUs were installed in higher voltage substations. The rationale behind this approach is to mimic the way utilities will deploy PMUs.
A total of 143 PMUs were deployed corresponding to 470 phasordata analog points defined in the Oracle data source DB.
This consists of mixture of absolute values such as voltage and current angles, and difference values such as voltage angle difference and power factor angles. Current magnitudes were also defined.
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Improved Accuracy in State Estimation
Number of PMUs
Stan
dard
Dev
iatio
n of
PO
WER
FLO
W E
RR
OR
S
Traditional State Estimator
Immediate Improvement inState Estimation Accuracy
Phasor-Assisted State Estimator
PMUPMU
PMUPMU