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Simulator 16 User Guide - PowerWorld

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Transient Stability Analysis: Simulation<br />

The Simulation Control page is available on the Transient Stability Analysis dialog.<br />

The Transient Stability Dialog allows you to define a particular transient stability event which you want<br />

to study. <strong>PowerWorld</strong> refers to this as a Transient Stability Contingency because in concept it is similar<br />

to the contingency analysis run using power flow solutions. The goal is to simulate a particular<br />

contingency to see if it causes any problems for the system. The contingency will consist of one or<br />

more events. For example, a transient contingency with only one event might be to model the outage<br />

of a generator with the goal of seeing how the governor response of the remaining generators handles<br />

this. Another contingency might be to model a fault at a bus which requires two events: one to initiate<br />

the fault and a second to clear the fault.<br />

Defining a Transient Contingency<br />

When the Process Contingencies option is set to One Contingency at a Time, the dialog will<br />

appear as depicted below. When defining multiple transient contingencies see Transient Stability:<br />

Running Multiple Contingencies.<br />

Use the Add, Delete, and Rename buttons to manage your transient contingencies. The drop-down<br />

allows you to choose the presently active transient contingency. Transient Contingencies differ from<br />

the power-flow based contingency analysis most importantly by introducing the concept of timing.<br />

Transient Contingencies require you to specify a Start Time and an End Time for the simulation,<br />

both specified in seconds. You must also specify a simulation time step which will be used by the<br />

numerical integration software. The following parameters for the transient contingencies are<br />

specified at the top of the dialog.<br />

Add..<br />

Click to add a new transient contingencies. The new contingency will automatically be given an<br />

unused name starting with "My Transient Contingency". Note that when choosing to Store<br />

Results to Hard Drive, then name of the transient contingency will determine the name of the file<br />

to which results are stored.<br />

Delete...<br />

Click to Delete the present contingency. Note that at least one transient contingency must always<br />

exist. If you choose to delete the only transient contingency defined, then a new empty transient<br />

contingency names "My Transient Contingency" will automatically be created.<br />

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

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