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Simulator 16 User Guide - PowerWorld

Simulator 16 User Guide - PowerWorld

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PV/QV Refine Model<br />

Modeling idiosyncrasies may exist that cause premature loss of convergence during either a PV or QV<br />

analysis. The PVQV add-on has a tool to modify the currently open case in an attempt to fix some of<br />

these idiosyncrasies. This is the Refine Model tool that is available on the Add Ons ribbon tab in the<br />

PV and QV Curves (PVQV) ribbon group.<br />

The case can be refined with the following options:<br />

Fix transformer taps<br />

If there are transformers that have Vmax and Vmin that are very close together, the power flow may<br />

have a difficult time converging. This option allows the user to fix all transformer taps at their<br />

present values if their Vmax - Vmin is less than or equal to the user specified tolerance.<br />

Fix shunts<br />

If there are switched shunts that have Vmax and Vmin that are very close together, the power flow<br />

may have a difficult time converging. This option allows the user to fix all switched shunts at their<br />

present values if their Vmax-Vmin is less than or equal to the user specified tolerance.<br />

Take units off AVR control<br />

If there are generators that have Qmax and Qmin that are very close together, the power flow may<br />

have a difficult time converging. This option allows the user to remove these units from AVR control,<br />

thus locking their MVAR output at its present value, if their Qmax - Qmin is less than or equal to the<br />

user specified tolerance.<br />

Apply to<br />

OK<br />

These refinements will only be applied to those areas or zones that have the Apply? field set as YES<br />

in this dialog box. This field can be toggled between YES and NO by left-clicking on the appropriate<br />

entry.<br />

Click this button to make the selected changes to the currently open power flow case. After the<br />

changes are made the Close button must be clicked to close the dialog. If any changes have been<br />

made and the dialog is closed, the user will be prompted to save the case to a file.<br />

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

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