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Simulator 16 User Guide - PowerWorld

Simulator 16 User Guide - PowerWorld

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OPF Options: Advanced Options<br />

Detection of LP Cycling<br />

This option allows for advanced tweaking of when cycling is detected in the LP. It is recommended<br />

that users leave the default settings in place.<br />

Minimum Number of Degenerate Iterations to Assume Cycling<br />

To prevent inaccurate identification of cycling in the LP solution, the minimum number of<br />

degenerate iterations before cycling is identified can be specified manually in this box.<br />

Minimum Number of Degenerate Iterations Multiplied by Number of Tableau Rows<br />

To prevent inaccurate identification of cycling in the LP solution, the minimum number of<br />

degenerate iterations as a multiple of the number of tableau rows can be specified manually in<br />

this box.<br />

Number of Sequential Degenerate Iterations for Last Case<br />

This displays the number of degenerate iterations detected when performing the most recent<br />

OPF solution.<br />

Power Flow Recalculation<br />

Choose one of the options to determine how often the power flow is resolved. The three options are,<br />

"When total generator MW change > than tolerance"; "After each LP solution"; and "Only at end of<br />

LP OPF". If the power flow is not resolved, linear sensitivities are used to determine which<br />

constraints enter the LP tableau.<br />

Total Generator Change Tolerance (MW)<br />

Specifies the total generator change tolerance. The default is 500 MW.<br />

After each LP solution<br />

Resolves the power flow upon completion of each LP solution<br />

Only at end of LP OPF<br />

Resolves the power flow only after the LP OPF has completed.<br />

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

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