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Simulator 16 User Guide - PowerWorld

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Power Flow Solution: General<br />

The following options are all contained on the General tab after choosing the Power Flow Solution<br />

page of the <strong>Simulator</strong> Options.<br />

Assumed MVA Per-Unit Base<br />

This option allows the user to specify the MVA base to be used for the entire case. By default, this<br />

value is set to 100 MVA. Click on the Change System Base button to change this value and then<br />

update all the internal structures to store the proper values on the new base.<br />

Bus Loss Sensitivity Function<br />

Bus loss sensitivities indicate how island or area losses change with power injection at the bus. Here<br />

you may choose to forego the calculation of bus loss sensitivities or to base them on island losses or<br />

area losses. If the case consists of only one island, which, by definition, corresponds to the entire<br />

system, then the bus loss sensitivities are measured with respect to total system losses. If the bus<br />

sensitivities are set to <strong>User</strong>-Specified, the sensitivities will remain at their last calculated values,<br />

according to the loss function type previously specified when the loss sensitivities were calculated.<br />

Monitor/Enforce Contingent Interface Elements<br />

This global location allows you to determine how contingency elements in an interface should be<br />

treated in <strong>Simulator</strong>. You can choose to never include the impact of contingent elements on<br />

interface flow, to only include contingent element impacts in the standard power flow or optimal<br />

power flow routines, or in all solution routines including contingency analysis and security<br />

constrained OPF.<br />

It is not uncommon to ignore the impact of contingent elements when using the contingency<br />

analysis or security constrained OPF tools, as they are already processing lists of contingencies and<br />

evaluating flows on interfaces. Ignoring contingent elements within interface definitions allows for a<br />

determination of the impact of other contingencies on the flows of the non-contingent elements<br />

forming the interface, without impact from additional contingent element considerations.<br />

Power Units for Display<br />

Allows switching between displaying power values in Mega- units or Kilo- units.<br />

©2011 <strong>PowerWorld</strong> Corporation<br />

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