See Also
To access the Flows and Voltages Sensitivities dialog, go to the Tools ribbon tab, and choose Sensitivities > Flows and Voltages Sensitivities from the Run Mode ribbon group. This is only available in Run Mode.
The grids that occupy all of the tabs on this dialog list each device of the particular type in the system, subject to the Area/Zone/Owner Filter settings. These grids are case information displays, and thus share properties and controls common to all other case information displays.
Multiple Meters, Multiple Control Change
The Multiple Meters, Multiple Control Change tab shows the impact on a specific field for each device type to a change in a control setpoint in the system.
The Control Types that can be selected:
- Generator Voltage Setpoint - sensitivity to changing the voltage setpoint at a generator in pu. Control unit is pu.
- Transformer Tap Ratio - sensitivity to changing the transformer's tap ratio. Control unit is the tap ratio.
- Phase Shifter Phase Shift - sensitivity to change the phase shifter phase angle. Control unit is degrees expect when calculating angle sensitivities and then it is radians.
- Switched Shunt Nominal Mvar - sensitivity to changing the nominal Mvar injection at a switched shunt. Control unit is Mvar.
- Line Impedance Xinj - sensitivity to changing the per unit series reactance X value on a branch. Control unit is per unit.
The available Control Devices depend on the selected Control Type. Control devices must be chosen by toggling the "Selected?" field to YES in the list of control devices.
Finally, you must select a Metered Field for each metered object type. The metered object types are Buses, Generators, Branches, and Interfaces. By default, None is selected.
Click Calculate Sensitivities to perform the calculations.
The calculated sensitivities show up in a matrix display on the various tabs, where each tab corresponds to a metered object type. On each tab, each row corresponds to a specific metered data object, and each column corresponds to a selected control device. For each metered object type, results are only shown for one Metered Fieldat a time, and the field choices are the following:
Buses
- Nonecalculates no sensitivities for Buses
- Sensitivity: dV/dControl (per unit/control unit) --> dV/dControlgives the sensitivity of the bus voltage in per unit to the selected Control Type
- Sensitivity: dAngle/dControl (radians/control unit) --> dAngle/dControl gives the sensitivity of the bus angle in radians to the selected Control Type
- Sensitivity: dQ/dControl (Mvar/control unit) --> dQ/dControl gives the sensitivity of the bus Mvar injection to the selected Control Type
If the Integrated Topology Processing add-on is available, the Only show the primary bus for each superbus checkbox will be available. When checked, the buses that show up in the table will be limited to only those that are primary nodes. The determination of primary nodes is based on the base case topology. This provides an easy filter to eliminate redundant data.
Generators
- Nonecalculates no sensitivities for Generators
- Sensitivity: dQ/dControl (Mvar/control unit) --> dQ/dControl gives the sensitivity of the generator Mvar injection to the selected Control Type. When determining this sensitivity, the sensitivity of the total Mvar injection at the generator bus is determined. This total is apportioned to specific generators at a bus based on their proportion of the total Mvar range for the bus. Only generators that are online and on AVR control are included in the calculation.
Branches
- Nonecalculates no sensitivities for Branches
- Sensitivity: dP/dControl (MW/control unit) --> dP/dControlgives the sensitivity of the branch MW flow to the selected Control Type
- Sensitivity: dQ/dControl (Mvar/control unit) --> dQ/dControl gives the sensitivity of the branch Mvar flow to the selected Control Type
Interfaces
- Nonecalculates no sensitivities for Interfaces
- Sensitivity: dP/dControl (MW/control unit) --> dP/dControlgives the sensitivity of the interface MW flow to the selected Control Type
- Sensitivity: dQ/dControl (Mvar/control unit) --> dQ/dControl gives the sensitivity of the interface Mvar flow to the selected Control Type
SimAuto and Script Command Compatibility
The results of the sensitivity analysis can be accessed using script commands or SimAuto by using the variable MULTMETERMULTCONTROLSENS with the appropriate metered data object: Bus, Gen, Branch, Interface. There will be as many columns with the MULTMETERMULTCONTROLSENS name and appropriate location number as there are control devices that were studied. There will be as many rows as there are metered data objects. The location numbers start at 0. The results are assigned in the order that the control devices are selected. For example, if the case defines five branches in the following order: 1 to 2, 2 to 4, 4 to 3, 3 to 1, 2 to 3, and branches 2 to 4 and 4 to 3 are selected, MULTMETERMULTCONTROLSENS :0 will correspond to branch 2 to 4 and MULTMETERMULTCONTROLSENS :1 will correspond to branch 4 to 3 for all sets of results.