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Properties of Simulator Objects Transformer AVR Dialog The Transformer AVR Dialog is used to view the control parameters associated with load-tapchanging (LTC) transformers when they are used to control bus voltage magnitudes. To view this display, click the Automatic Control Options button on the Line/Transformer Information Dialog. This dialog has the following fields: Automatic Control Type This section is only visible on the dialog in edit mode. The control type of the transformer can be changed between no control, voltage regulation, reactive power control, or phase shifter control. Regulated Bus Number The number of the bus whose voltage is regulated by the control. Present Regulated Bus Voltage The present voltage of the regulated bus. Voltage Error If the regulated bus' voltage falls outside the regulating range of the transformer (as defined by the Minimum Voltage and Maximum Voltage fields), the Voltage Error field indicates by how much the voltage deviates from the control range. Regulation Minimum Voltage The minimum acceptable voltage at the regulated bus. Regulation Maximum Voltage The maximum acceptable voltage at the regulated bus. Regulation Target Type As long as the regulated voltage is inside the regulation minimum and maximum, then the transformer will not change its tap ratio. When the regulated voltage moves outside of this regulation range, then Simulator will calculate a new tap ratio in an attempt to bring the regulated voltage back inside of its range. The Regulation Target Type determines what value is used as a target when calculating this change in tap ratio. Middle is the default and means that the target is the average of the regulation minimum and maximum regardless of whether the voltage is high or low. Max/Min means that the regulation maximum is used as the target when the regulated voltage is above the maximum, and regulation minimum is used as the target value when the regulated voltage is below the minimum. Present Tap Ratio The tap ratio of the transformer for the current system state. Minimum Tap Ratio, Maximum Tap Ratio Minimum and maximum allowable off-nominal tap ratios for the LTC transformer. Typical values are 0.9 and 1.1. Tap Step Size Transformer off-nominal turns ratio increment. The off-nominal turns ratio is either incremented or decremented from 1.0 in integer multiples of this value. Default value is 0.00625. 401 PowerWorld Simulator Version 13 User’s Guide - September 26, 2007
