December 2020
Intermediate to advanced
545 pages
15h 57m
English
book
Modern Power System Analysis with MATLAB® Applications by Pearson
by R. Jegatheesan, K. Vijayakumar
Content preview from Modern Power System Analysis with MATLAB® Applications by Pearson
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Transient Stability Analysis
351
Even though the maximum time is specified as 0.5 sec., one more step is carried out to
decide about the stability.
For this problem, maximum permissible rotor angle,
δ
m
can be calculated as follows.
(Refer Fig. 7.22)
2 sin
δ
s
= 0.9.
Therefore,
δ
s
= 26.74°
Thus,
δ
m
= 180 – 26.74 = 153.26°
Since the rotor angle is exceeding 153.26°, instability occurs.
This can also be seen from the fact that the clearing time of 0.425 sec. is greater than the
CCT, 0.38 sec.
Swing curves for sustained fault, with clearing time less than CCT and with clearing time more
than CCT were obtained in Examples 7.4, 7.6 and 7.7. Check these results ...
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