The on-line analysis and solution output
largely depends upon availability of complete real
time data from field and corresponding network
modeling. In order to address frequent changes in
network configurations at lower voltage level due to
regular re-orientation, network expansion and derating
and consequent introduction of un-observable
network island, an attempt has been made to
configure network in hybrid format having multiple
network models for on-line network analysis. The
proposed algorithm is an improvement from the
standard practice to maintain a single integrated
model comprising complete network in case of a
real time SCADA / EMS system. Because of tight
coupling between SCADA and network model, the
minute configuration change at lower end of the
network hampers complete on-line analysis. It is
also observed that for a real time system, crisis
situation demands for quick security analysis. It is
proposed to address these issues for maintaining
multiple on-line models. Separate network model is
proposed consisting of inter-state transmission
systems (ISTS) and major lines of grid operational
importance for a quick study for reliability and
security analysis The other model could be a total
grid comprising all transmission networks at 110kV
voltage and above grid lines. Such model could be
used for detailed studies as and when required. It is
standard practice in any state-of-art real time
SCADA/EMS system to maintain three separate and
independent system along with data base for (i)
main run time system, (ii) Training simulator and
(iii) program development system. Till the evolving
common information model (CIM) [8] technology
with suitable application communication interface
(API) is developed and available for operational
usage, the hybrid network model could be
implemented at southern regional load dispatch centre Bangalore India as per flow chart given on
Fig. 6.