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Calculating Transfer Limits

[Summary] [Comparing FCITC Reports]
[Transfer Limit Calculations] [Limit Diagrams]

Summary

FCITC measures the maximum increase in transfer that can take place between two selected subsystems without violating branch ratings or interface limits during single contingencies. Traditionally, this analysis has been performed with linearized models with generation in the sending and receiving subsystems adjusted according to user-defined participation factors.

PSS™MUST allows overlapping (in fact, arbitrary) subsystems to be used for FCITC definitions for transaction analysis. This allows, for example, modeling transfers from generation to load within the same area to simulate daily pattern and analyze loop flows. The same generators could be defined in both sending and receiving subsystems, within parallel transfer sensitivity analysis.

PSS™MUST can create an FCITC report in three different formats:

  1. A detailed two-line report, which is the most detailed FCITC report allowing convenient analysis of all relevant information on one screen.

  2. A "wide" one-line report using one line per every reported limiting element. .

  3. A report in the same format of PSS™E Activity TLTG, which may be useful for users who already have automated procedures that assume the layout of TLTG reports. This format does not contain all the information reported when using the other two formats.

All PSS™MUST FCITC reports contain an ordered list of limits for monitored element/contingency pairs. The FCITC reports are sorted such that the smallest (i.e., the most restrictive) limits appear first. The maximum FCITC of interest is user specified. Study transfer levels at which branch and interface limits are reached for the base case conditions are also listed with the FCITC report. A separate base case only violations report (NITC report) can also be created.

As an option, the user can obtain a report for base case only violations.

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Transfer Limit Calculations

FCITC measures the maximum increase in transfer that can take place between two selected subsystems without violating branch ratings or interface limits during single contingencies. Traditionally, this analysis has been performed with linearized models with generation in the sending and receiving subsystems adjusted according to user-defined participation factors.

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PSS™MUST can calculate the FCITC limits for one study transfer or from multiple study transfers simultaneously. The results are then presented in an MS Excel summary report. A batch mode is also available from the multiple FCITC report that allows the user to create FCITC reports for each study transfer as ASCII files on disk. Furthermore, two FCITC reports may be compared and a graph of the first 10 monitored element/contingency pairs in both reports may be created.

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Comparing FCITC Reports

PSS™MUST allows the user to compare two FCITC reports and display the results in the FCITC Comparison worksheet. The comparison is based on a single monitored element and contingency pair matching in both reports. If a monitored element/contingency pair is missing from either report then N/As will be reported in the columns of the report from which it is missing.

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A chart of the first 10 matching monitored element/contingency pairs FCITC values from the first report to the second report may also be created.

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Limit Diagrams

The FCITC Limit Diagram allows the user to add a box representing the limiting NITC and FCITC values for a source/sink pair of the user’s choosing onto a worksheet. This allows for a graphical way of presenting data. Other drawing entities that Excel allows to be placed on worksheets may also be placed on the FCITC Limit diagram such as lines, arrows, boxes, circles, etc.

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