7.11
Date Code 20090730 Instruction Manual SEL-734 Meter
Time-Synchronized Measurements
State Estimation Verification
Figure 7.3 Power Flow Solution
Use the power flow solution to verify the instantaneous positive-sequence
impedances of your system transmission lines.
State Estimation Verification
Electric utility control centers have used state estimation to monitor the state
of the power system for the past 20 years. The state estimator calculates the
state of the power system through use of measurements such as complex
power, voltage magnitudes, and current magnitudes received from different
substations.
State estimation uses an iterative, nonlinear estimation technique. The state of
the power system is the set of all positive-sequence voltage phasors in the
network. Typically, several seconds or minutes elapse from the time of the first
measurement to the time of the first estimation. Therefore, state estimation is a
steady-state representation of the power system.
Consider using precise simultaneous positive-sequence voltage measurements
from the power system to verify your state estimation model. Take
time-synchronized, high-resolution positive-sequence voltage measurements
at all substations. Send the Meter Fast Messages to a central database to
determine the power system state.
S
T
R
P = 154.1 MW
P = 306.5 MW
P = 153.7 MW
P = 153.1 MW P = 152.8 MW
Q = 138.2 MVAR Q = 145.9 MVAR
Q = 147.8 MVAR Q = 140.5 MVAR
Q = 5.4 MVAR
Line Loss
P = 0.4 MW
Q = 7.7 MVAR
Line Loss
P = 0.3 MW
Q = 7.3 MVAR
Courtesy of NationalSwitchgear.com
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