Lab7a-PSCAD-CapacitorSwitchingStudey
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California Polytechnic State University, Pomona *
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4821L
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Electrical Engineering
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Dec 6, 2023
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LAB 7A
ECE 4821L
Capacitor Switching Study
T2.1
Create a folder called
c:……/
Save the case as
T_02_a.psc
.
The utility plans to add 300 MVars of capacitive reactive power at station A to support
the 230 kV bus voltage. A transient study is required to design equipment of this
installation.
Calculations and simulations are required to determine the values/ratings of the
associated limiting reactors (inrush and outrush)
Modify the simulation case to include a sub-page as shown in fig. 1.
RL
V
F
Ph
RRL
60.0
230 kV
Voltage support
Cap. Bank
GT230
Fig.1 Capacitor banks at Station A.
The circuit inside the sub page represents a 230 kV capacitor bank with 4 steps per
phase (see attached diagrams). Each step is rated at 25 Mvar/phase.
The capacitor
banks are solidly grounded. The inrush and the outrush reactors sizes are to be
determined so that the switching transients do not exceed the breaker capabilities and
are within the IEEE standards.
The values of the outrush/inrush reactors have been determined using
IEEE
C37.06.2000.
T2.2
Use manual breaker controls to switch the breakers R1, R2 and R4.
Also measure
the currents in the breakers.
2 / 4
T2.3
Add a timed breaker component to control breaker R3, measure the currents in R3.
T2.4
Add meters to measure the currents and voltages on the system side of the
outrush reactor.
T2.5
Run the case with R1 closed, R2 and R4 open, and R3 set to close at 0.2 s.
T2.6
Observe the peak value and frequency of oscillation of the current in R3.
T2.7
Observe the peak value and frequency of oscillation of the current at the outrush
reactor.
T2.8
Note the differences between (7) and (8). Discuss the results.
Important:
Ensure that you are using the proper time step and for visualization
purposes, the proper plot step!
T2.9
A Peak inrush current depends on POW switching.
This should be studied to
ensure that the breaker meets the TRV and di/dt capabilities.
T2.10
Use the Multiple Run component to control the R3 closing time.
Also record the
currents in Breaker R3 and main feeder current.
Set the multiple run to switch for 5 sequential points on the wave.
Can we do random switching over a cycle?
Can we optimize the run length using a snapshot?
Take a snapshot at 0.199sec and the run multiple run for 20 sequential points on the
wave.
Compare your results with IEEE standard results. Can the simulation time step be
changed when the case is run from a snapshot file?
T2.11
What are some considerations for the selection of time-step for this type of
simulation?
T2.12 EXTRA
: Check the impedance spectrum using the ‘Harmonic Impedance’
component. This is an important step in the design of capacitor banks. The addition of
the capacitors can give rise to system resonances that are not acceptable.
Is this circuit appropriate to check for system resonances? Why? (not enough details of
the system around the Station A bus is included to capture the frequency effects)
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