PV/QV Refine Model

 

Modeling idiosyncrasies may exist that cause premature loss of convergence during either a PV or QV analysis. The PVQV add-on has a tool to modify the currently open case in an attempt to fix some of these idiosyncrasies. This is the Refine Model tool that is available on the Add Ons ribbon tab in the PV and QV Curves (PVQV) ribbon group.

 

 

The case can be refined with the following options:

Fix transformer taps

If there are transformers that have Vmax and Vmin that are very close together, the power flow may have a difficult time converging. This option allows the user to fix all transformer taps at their present values if their Vmax - Vmin is less than or equal to the user specified tolerance.

Fix shunts

If there are switched shunts that have Vmax and Vmin that are very close together, the power flow may have a difficult time converging. This option allows the user to fix all switched shunts at their present values if their Vmax-Vmin is less than or equal to the user specified tolerance.

Take units off AVR control

If there are generators that have Qmax and Qmin that are very close together, the power flow may have a difficult time converging. This option allows the user to remove these units from AVR control, thus locking their MVAR output at its present value, if their Qmax - Qmin is less than or equal to the user specified tolerance.

Apply to

These refinements will only be applied to those areas or zones that have the Apply? field set as YES in this dialog box. This field can be toggled between YES and NO by left-clicking on the appropriate entry.

OK

Click this button to make the selected changes to the currently open power flow case. After the changes are made the Close button must be clicked to close the dialog. If any changes have been made and the dialog is closed, the user will be prompted to save the case to a file.

Close

Click this button to close the dialog without implementing any changes to the power flow case in memory.