Simulator 16 User Guide - PowerWorld

The Multiple Bus Sensitivities show the values calculated at each bus for each device examined
during the analysis. Multiple Generator and Load Sensitivities show the same information but have
only a list of either generators or loads with the P Sensitivity column showing the sensitivity
calculated at the terminal bus. The Multiple Injection Group Sensitivities represent averages of
multiple bus sensitivities weighted by the participation factor of each generator, load, or switched
shunt in the group. All participation factors are included in this calculation regardless of the AGC
status of any included generator.
If using the Integrated Topology Processing add-on, an Only show the primary bus for each
superbus checkbox will be available on the Buses tab. Checking this box will limit the buses shown
on that tab and the list of Bus transactors to only those that are primary buses. This provides a
quick means of removing the clutter of redundant data. The primary buses and superbuses are
determined from the base case topology.
The results of the multiple element analysis can be accessed using script commands or SimAuto by
using the variable MULTBUSTLRSENS with the appropriate data object: Bus, Gen, Load, or
InjectionGroup. There will be as many variables with the MULTBUSTLRSENS name and appropriate
location number as there are elements that were studied. The location numbers start at 0. The
results are assigned in the order that the elements are included in the list of branches or interfaces
to be studied. For example, if the list of branches includes five branches defined in the case in the
following order: 1 to 2, 2 to 4, 4 to 3, 3 to 1, 2 to 3, and branches 2 to 4 and 4 to 3 are selected for
inclusion in the multiple element TLR calculation, MULTBUSTLRSENS:0 will correspond to branch 2
to 4 and MULTBUSTLRSENS:1 will correspond to branch 4 to 3 for all sets of results. When selecting
devices to study based on them being overloaded or contingency-overloaded, the results will appear
in the order that the overloaded elements are defined with the case. To determine which elements
are overloaded in the base case, use the LINELIMITPERCENT:2 field with Branch data objects and
the FGPERCENT field with Interface data objects. If these fields are greater than 100 percent then
the element is overloaded. The CTGVIOL variable can be used with the Branch or Interface data
type to determine if an element is overloaded due to a contingency. This field will be non-zero for
any element that has overloads due to contingencies.
©2011 PowerWorld Corporation
993