Shift Factor Sensitivities

 

(In Version 21 and earlier this was called the TLR Sensitivities or Generation Shift Factors)

Shift Factor Sensitivities are similar to the Power Transfer Distribution Factors. Both Shift Factor Sensitivities and PTDFs measure the sensitivity of the flow on a device to a transaction. To calculate PTDFs, you specify a source group and a sink group, and Simulator determines the percentage of a single transfer between the source and sink that flows on each of several monitored elements. For Shift Factor Sensitivities, you specify a single device, such as a transmission line, to monitor, and a group that serves either as source or as sink. Simulator then determines the sensitivity of the flow on the single monitored element to many different transactions involving the group you specified as the source or sink. To summarize, PTDFs express the sensitivity of many monitored elements to a single transaction, whereas Shift Factor Sensitivities gauge the sensitivity of a single monitored element to many different power transfers.

Shift Factors can be useful for determining which transactions may cause problems when a particular element is overloaded. Suppose we use the Shift Factor Sensitivity tool to determine where area A can purchase power from while a particular overloaded element is in place. We specify area A as the buyer area, identify the overloaded line, and tell Simulator to perform the calculation. Simulator will then list the sensitivity of the flow on the overloaded line to power exchanges between all other generators, areas, and buses to area A. Any transaction for which the sensitivity exceeds some threshold percentage you choose might be a problem and those below might be OK.

To calculate Shift Factor Sensitivities, select Tools > Sensitivities > Shift Factors from the main menu. This will open the Shift Factor Sensitivities dialog, which will allow you to set Shift Factor Sensitivities options and then calculate the sensitivities.