Stevenson J. Power system analysis
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676
CHAER 15 STATE ESTIMATION OF POWER SYSTEMS
ZI' ZZ' z3' and Z4 in the original measurement set and the at-start values
xiO) = 0, x�O) = x�O) = 1.0 per unit we repeat the state-estimation calculations,
which yield
i 1
=
2
-0.1600 rad = -9.1673°
x
2
= IV
2
1 =
0.9223 per unit
The reader can verify the fo llowing numerical values of the corresponding jacobian
H
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