T. H. SIKIRU ET AL.
990
00.2 0.4 0.6 0.8 11.2 1.4
0.8 4
0.8 6
0.8 8
0.9
0.9 2
0.9 4
0.9 6
0.9 8
1
1.0 2
1.0 4
Loading Parameter
(p.u.)
Voltage (p.u.)
No SVC (Bus 30)
Pro po sed ap proa c h (B u s 34)
MS-B e nd er deco m po s it i o n (Bus 25)
Figure 4. Power-voltage curve of the test network.
reaching their reactive power limits. This allows the gen-
erators to be free to supply more active power as the load
demand increases in topologically strong networks. On
the other hand, for topologically weak networks, the
compensators should be located on nodes farthest from
the generators, (i.e. on buses associated with the smallest
eigenvalues) [20,24] to ensure that the networks would
be within the acceptable voltage limits.
5. Conclusions
This paper has demonstrated that the network inherent
characteristics derivable from the Schur complement of
the partitioned Y-admittance matrix could be used to
identify suitable locations for improving reactive power
reserve margins in power system networks. For the case
of topologically weak (ill conditioned) networks, buses
associated with the smallest eigenvalues are suitable lo-
cations for installing reactive power compensators to
ensure feasibility of the network operating voltages. On
the other hand, topologically strong networks, operating
well within the desired voltage limits could increase their
loadability margin by installing reactive power compen-
sators on buses associated with the largest eigenvalues.
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