Transformer Phase Shifting Dialog
The Common Options tab of 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. Changing the control type will update the dialog to reflect the type of control that is selected.
Regulated Bus Number
Number of the terminal bus of the phase shifter regulated by the phase shifter. When control is active, the phase shifter will automatically change its phase shift to keep the MW flow at this bus at the desired value.
Current MW Flow
Current MW flow through the transformer measured at the regulated bus terminal.
MW Error
If the current MW flow falls outside the minimum/maximum MW flow limits, the MW Error field indicates by how much the flow violates the regulating range.
Regulation Minimum MW Flow, Regulation Maximum MW Flow
Minimum and maximum allowable MW flow through the phase shifter.
Regulation Target Type
As long as the regulated MW flow is inside the regulation minimum and maximum, the transformer will not change its phase angle. When the regulated MW flow moves outside of this regulation range, Simulator will calculate a new phase angle in an attempt to bring the regulated MW flow back inside of its range. The Regulation Target Type determines what value is used as a target when calculating this change in phase angle. Middle is the default and means that the target is the average of the regulation minimum and maximum regardless of whether the MW flow is high or low. Max/Min means that the regulation maximum is used as the target when the regulated MW flow is above the maximum, and regulation minimum is used as the target value when the regulated MW flow is below the minimum.
Present Phase Angle (Degrees)
The phase angle of the transformer for the current solved system state.
Minimum Phase Angle, Maximum Phase Angle
Minimum and maximum allowable phase shift in degrees.
Step Size (Degrees)
Phase shift change per step in degrees.
MW Flow to Phase Sensitivity
The sensitivity of the controlled MW flow to changes in the transformer's phase. This sensitivity indicates the transformer's ability to regulate its MW flow.
Impedance Correction Table
Specifies the number of the transformer's corresponding transformer impedance correction table. Transformer impedance correction tables are used to specify how the impedance of the transformer should change with the phase angle. If this number is 0, no impedance correction table is associated with the transformer, and the impedance of the transformer will thus remain fixed as the phase angle changes. Valid impedance correction table numbers range from 1 to 63. To assign an existing impedance correction table to the transformer, enter the existing table's number. To view the existing impedance correction tables, click the Insert/View Impedance Correction Table button, which brings up the Transformer Impedance Correction Dialog. To define a brand new impedance correction table for the transformer, enter an unused table number and then click Insert/View Impedance Correction Table to prescribe the correction table. Note that the association between a transformer and an impedance correction table is not finalized until you select either OK or Save on the Branch Information Dialog or Branch Options dialog.
View Transformer Correction Table or Insert Transformer Correction Table
Click on this button either to view or to insert transformer correction tables. Clicking on this button displays the Transformer Impedance Correction Dialog. Note that a table must contain at least two points in order to be defined.
The Time Step Options tab contains control options specific for the Time Step Simulation tool.