Page 229 - Decision Making Applications in Modern Power Systems
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Role of microphasor measurement unit Chapter | 7 193
P
µP U1 µ P M U µ P M U
M
1
U
µPMU22
µPMUn
Acquire phase angle information of
various points from µPMU
Calculate the impedances between
various points by suitable algorithms
Yes
Is impedance < Threshold ?
No
Send fault
decisions to
Compare impedances to get the
faulted line section other
substations
FIGURE 7.8 Flowchart of the proposed algorithm.
Tie switch 1
14 15
Tie switch 2
1 2 3 4 5 6 7 8 9 10 11
Tie switch 3
12 13
FIGURE 7.9 Reconfiguration possibilities in a typical distribution system.
switches. It is generally done to transfer loads from heavily stressed fee-
ders to less stressed feeders to avoid overloading failures. It is also done
to manage power restoration after a fault scenario. It is a multiobjective
as well as complex procedure, and the algorithms should be quick enough
to handle several load flow calculations making the decisions in a timely
manner.
Reconfiguration by manual labor is a time-consuming task and techni-
cally infeasible. An automated reconfiguration procedure will need an
array of sensors to acquire the magnitude data of voltages. Even if the
magnitude data on each side of breaker is acquired by suitable data
acquisition systems, there is a need for phase angle information. If the
