Download Wkshp_ATC_Playback_Model_Validation

PSSE Playback Model Validation
with PMU Data
Damien Sommer, P.E.
Senior Transmission Planning Engineer
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ATC Footprint
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DATC Transmission in WECC
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PSSE Playback Feature
• Model will be available in PSS®E version 34.1
• The model is supplied as part of PSS®E installation;
therefore, use of this model will not require compilation
and link.
• For version 33 users a .dll file can be downloaded from
the Siemens PTI website
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PSSE Playback Feature
• This model plays back a known set of voltage and frequency
signals.
• The PLBVFU1 model acts as a generator model. In using this
generator model, do not attach an AVR or governor model to
the machine associated with the PLBVFU1 model.
• The played-in voltage and frequency signals must be
described in a file as shown below, with each sample
described in a separate record and the values in each line
separated by spaces or commas:
Time, voltage, frequency
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PSSE Playback Feature
• The file containing the measurement has to be supplied
in a file with an extension “.plb”. The file name (without
the “.plb” extension) has to be less than or equal to 12
characters long for PSSE v 34 and less than or equal to
2 characters for PSSE v 33. This file has to exist in the
working folder. If the “plb” file is not found, the PLBVFU1
model will keep the internal voltage and frequency fixed
at the initial value (i.e., the playback feature will be
ignored).
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PSSE Playback Feature
• The voltage signal which is played back is the internal
(Thevenin) voltage of the playback generator. The
ZSORCE of the generator used to represent the
PLVFBU1 model should be non-zero.
• The sampled voltage and frequency values may be
smoothed via a first order block with time constants Tv
(for voltage signal) and Tf (for frequency signal).
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PMUs On ATC Transmission System
• 21 PMUs on high side of GSUs:
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9 Coal
4 Combined Cycle Gas
2 Nuclear
4 Wind Farms
2 HVDC terminals
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Python Script v1 – User Input Data
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baseCase = ‘Large_Coal_Unit_v33_20151008'
plbfile = 'AA'
dyrfile = 'Large_Coal_Unit_v33_20151008'
csvoutfile = ‘Large_Coal_Unit.csv'
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testGenNum = 700001
testGenID = ‘1'
equivFrom = 700000
Vnom = 345
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Python Script v1 – Mini State Estimation
• Retrieve initial conditions recorded by PMU at POI
• Sets the initial conditions in the simplified case to those
observed by the PMU at the POI
• Save case with initial conditions as temp.raw
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Python Script v1 – Run and Output
• Run simulation using PMU data to define playback unit
response
• Creates channel files for voltage, frequency, active
power and reactive power at POI bus where PMU was
recording
• Outputs a .csv file with data for each channel
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Playback Simulation Process
• place PMU data .csv file, PSSE files, Python script in
event folder
• Save .csv file as .plb file
• Run script (takes about 30 seconds)
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Example 1: Large Coal Unit, Line Faults
• Simplified Model Used in Playback Runs:
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Demonstration
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Example 1: Large Coal Unit, Line Faults
Event 1
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Example 1: Large Coal Unit, Line Faults
Event 2
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Example 1: Large Coal Unit, Line Faults
Event 3
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Example 1: Large Coal Unit, Line Faults
Event 4
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Example 2: Large Coal Unit, Large Unit Trip
Event 1
• If monitored unit is not dispatched to PMAX governor
PMAX value in .dyr file will likely have to be updated
• Values in MMWG case
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–
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Unit MVA = 825
PMAX = 634
IEEEG1 governor model
PMAX (pu on machine MVA rating) = 0.847 (~700/825)
• PGEN = ~500 MW during this event
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Example 2: Large Coal Unit, Large Unit Trip
Event 1, PMAX = 0.847
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Example 2: Large Coal Unit, Large Unit Trip
Event 1, PMAX = 0.606 (Pgen / MVA)
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Example 2: Large Coal Unit, Large Unit Trip
Event 1, PMAX = 0.615
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Example 2: Large Coal Unit, Large Unit Trip
Event 3, Oscillations
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Example 3: Combined Cycle Plant, Large
Unit Trip – CT1 First Pass
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Example 3: Combined Cycle Plant, Large
Unit Trip – CT1 First Pass
• If using actual bus numbers and reusing the same
python script check channel numbers
• PSSE orders model information by bus number
ascending order
• If gen bus number is larger than POI bus number in one
raw file but smaller than POI bus number in another raw
file your exported channels will be different
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Example 3: Combined Cycle Plant, Large
Unit Trip – CT1 Second Pass
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Example 3: Combined Cycle Plant, Large
Unit Trip – CT2
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Example 3: Combined Cycle Plant, Large
Unit Trip – ST
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Example 3: Combined Cycle Plant, Line
Fault – CT1
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Example 3: Combined Cycle Plant, Line
Fault – CT2
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Example 3: Combined Cycle Plant, Line
Fault – ST
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Example 4: ~300 MW Coal Unit
Line Fault Event
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Example 5: ~300 MW Coal Unit
Trip of 850 MW Unit in Remote Location
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Example 6: ~600 MW Nuclear Unit
Trip of 1200 MW Unit in Remote Location
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Example 7: ~600 MW Nuclear Unit
345-kV Line Fault
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Harder Configurations to Validate:
Gas Plant with PMU at Shared POI
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Harder Configurations to Validate:
Gas Plant with PMU at Shared POI
• PMU is on the POI bus and thus captures the output of
both units simultaneously
• Version 2 Python Script required
• Investigate PI Historian data on the two units and set
one plant P and Q output to initial output
• Fix the P and Q of the second unit with state estimation
in in the python script
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Harder Configurations to Validate:
Wind Farm with Multiple Var Sources
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Harder Configurations to Validate:
Wind Farm with Multiple Var Sources
• PMU is on 138-kV Bus, there is a DSTAT model and
switched shunt device on the 34.5-kV bus
• Cap Bank on unit bus is supposed to be manual set in
the model based on wind unit output
• PI Historian data will have to be pulled to find starting
points for wind unit, switched shunts and DSTAT model
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Conclusion
• Still early in process of validating units but so far we
haven’t found any events where the models matched
reality very well
• This is a very important tool to help get us to better
models
• More work is needed with GOs to improve models
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Contact Information
Damien Sommer, P.E.
(262) 506-6949
[email protected]
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Questions
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