This chapter describes the features and functions of the data manipulation dialogs. These dialogs are opened from the Data Manipulation submenu of the Edit menu when a related data table is selected.
The data manipulation (scaling, reassigning, etc.) applies to the data included in the table. Therefore, to apply the action to the whole system, you must select the <All> subsystem for the table before the data manipulation. Otherwise, to apply the action to a part of the system, you must first define a simple or composite subsystem to represent that part, then select that subsystem for the table before the data manipulation.
10.1 Reassign Zone
When the active window is the AC Bus table, the Reassign Zone command of the Edit | Data Manipulation submenu opens the Set Zone dialog for changing the zone of all buses in the AC Bus table. The list in this dialog shows the number and name of all zones in the powerflow data, unless you select a previously defined subsystem other than <All> from the pull-down list at the top. Select a zone by clicking on a row in the zone list, then click OK button (or double click on the row). The zone of buses in the AC Bus table changes to this selected zone and the dialog closes.
To change the zone of buses to a new zone, you must first define the new zone by clicking New Zone… button. This adds a zone to the powerflow data and opens its property dialog for you to specify a number and name for this new zone. After you close the Zone Property dialog (Click OK button), the new zone appears in the zone list In the Search box, type in a Zone Number or Zone Name to find a zone in the list. As you type the number or name, the list scrolls and highlights the matching zone for you to select. For example as you type ABC, the first zone that has a name starting with ABC is highlighted.
To close the dialog without changing the zone of AC buses, click Cancel button.
10.2 Reassign Area
When the active window is the AC Bus table, the Reassign Area command of the Edit | Data Manipulation submenu opens the Set Area dialog for changing the area of all buses in the AC Bus table. The list in this dialog shows the number and name of all areas in the powerflow data, unless you select a previously defined subsystem other than <All> from the pull-down list at the top. Select an area by clicking on a row in the area list, then click OK button (or double click on the row). The area of buses in the AC Bus table changes to this selected area and the dialog closes.
To change the area of buses to a new area, you must first define the new area by clicking New Area… button. This adds an area to the powerflow data and opens its property dialog for you to specify a number and name for this new area. After you close the Area Property dialog (Click OK button), the new area appears in the area list
In the Search box, type in an Area Number or Area Name to find an area in the list. As you type the number or name, the list scrolls and highlights the matching area for you to select. For example as you type ABC, the first area that has a name starting with ABC is highlighted.
10.3 Scale MW Generation
When the active window is the Generator table, the Scale MW Generation command of the Edit | Data Manipulation submenu opens this dialog for changing MW output of all generators in the Generator table.
If you click in the Exclude negative generation box to select this option (add a check mark), generators with negative MW output will be excluded from scaling.
If you click the Respect Pmin & Pmax box to select this option (add a check mark), scaling of generation will respect each generators Pmin and Pmax and will not scale above their Pmax or scale below their Pmin. It is possible that if all scaled generators reach their limit that the desired final total generation may not be met.
Click in the Scale To box to select it and type in a MW value. When you click Scale button, the MW output of generators in the Generator table are scaled uniformly so that their sum will be equal to the value you specified in the Scale To box.
Click in the Scale By box to select it and type in a percent value. When you click Scale button, the MW output of generators in the Generator table are changed by the percentage you specified in the Scale By box. For example if you specify –10 in this box, MW outputs are reduced by 10% (i.e., 200 MW output becomes 180 MW).
Note that as you specify a total MW value in the Scale To box, the Scale By box shows by what percentage generations will change, and vice versa.
To close this dialog without changing MW generations, click Cancel button.
10.4 Scale Load
When the active window is the Load table, the Scale Load command of the Edit | Data Manipulation submenu opens this dialog for changing the real and reactive parts of all loads in the Load table.
If you click in the Exclude negative real load box to select this option (add a check mark), loads with negative real part will be excluded from scaling.
Click in the Scale Real Load To box to select it and type in a MW value. When you click Scale button, the real part of loads in the Load table are scaled uniformly so that their sum will be equal to the value you specified in the Scale Real Load To box.
Click in the Scale Real Load By box to select it and type in a percent value. When you click Scale button, the real part of loads in the Load table are changed by the percentage you specified in the Scale Real Load By box. For example if you specify –10 in this box, real loads are reduced by 10% (i.e., 200 MW load becomes 180 MW). Note that as you specify a total MW value in the Scale Real Load To box, the Scale Real Load By box shows by what percentage real loads will change, and vice versa.
For the reactive load, if you click the Keep Power Factors Constant radio button to select it, as the real loads are scaled, reactive loads are also scaled in proportion to their real part so that the power factor of each load remains constant.
If you click the Keep Reactive Load Constant radio button to select it, as the real loads are scaled, reactive loads remain constant.
Click in the Scale Reactive Load To box to select it and type in a MVar value. When you click Scale button, the reactive part of loads in the Load table are scaled uniformly so that their sum will be equal to the value you specified in the Scale Reactive Load To box.
Click in the Scale Reactive Load By box to select it and type in a percent value. When you click Scale button, the reactive part of loads in the Load table are changed by the percentage you specified in the Scale Reactive Load By box.
Note that as you specify a total MVAr value in the Scale Reactive Load To box, the Scale Reactive Load By box shows by what percentage reactive loads will change, and vice versa.
To close this dialog without changing the loads, click Cancel button.
10.5 Scale MVAr Load
When the active window is the Load table, the Scale MVAr Load command of the Edit | Data Manipulation submenu opens this dialog for changing the reactive part of all loads in the Load table. The real part of loads remains unchanged.
If you click in the Exclude capacitive load box to select this option (add a check mark), loads with negative reactive part will be excluded from scaling.
Click in the Scale To box to select it and type in a MVar value. When you click Scale button, the reactive part of loads in the Load table are scaled uniformly so that their sum will be equal to the value you specified in the Scale To box.
Click in the Scale By box to select it and type in a percent value. When you click Scale button, the reactive part of loads in the Load table are changed by the percentage you specified in the Scale By box.
Note that as you specify a total MVAr value in the Scale To box, the Scale By box shows by what percentage reactive loads will change, and vice versa.
To close this dialog without changing the loads, click Cancel button.
10.6 Scale Fixed Shunt
When the active window is the Fixed Shunt table, the Scale Fixed Shunt command of the Edit | Data Manipulation submenu opens this dialog for changing all shunt admittances in the Fixed Shunt table.
For Conductance, click in the Scale To box to select it and type in a MW value. When you click Scale button, the conductance of shunts in the Fixed Shunt table are scaled uniformly so that their “nominal” sum (sum of their MW loss at nominal voltage) will be equal to the value you specified in the Scale To box. Click in the Scale By box to select it and type in a percent value. When you click Scale button, the conductance of shunts in the table are changed by the percentage you specified in the Scale By box. For example if you specify –10 in this box, conductance of shunts are reduced by 10% (i.e., 20 MW shunt becomes 18 MW).
For Capacitance, click in the Scale To box to select it and type in a MVAr value. When you click Scale button, the positive susceptance shunts in the Fixed Shunt table are scaled uniformly so that their “nominal” sum (sum of their MVAr generation at nominal voltage) will be equal to the value you specified in the Scale To box. Click in the
Scale By box to select it and type in a percent value. When you click Scale button, the positive susceptance shunts
For Inductance, click in the Scale To box to select it and type in a MVAr value. When you click Scale button, the negative susceptance shunts (reactors) in the Fixed Shunt table are scaled uniformly so that their “nominal” sum (sum of their MVAr generation at nominal voltage; which is negative for reactors) will be equal to the value you specified in the Scale To box. Click in the Scale By box to select it and type in a percent value. When you click Scale button, the negative susceptance shunts in the table are changed by the percentage you specified in the Scale By box.
Note that as you specify a value in the Scale To box, the Scale By box shows by what percentage conductance, capacitance or inductance will change, and vice versa.
To close this dialog without changing the shunts, click Cancel button.
10.7 Convert Load Model
When the active window is the Load table, the Convert Load Model command of the Edit | Data Manipulation submenu opens this dialog for changing the model of all loads in the Load table.
In the Convert based on box, if you click the Bus Voltage radio button to select it, the Actual MW and MVAr loads remain the same (the Nominal values change) after the model conversion. If you click the Unity Voltage radio button to select it, the Nominal MW and MVAr loads remain the same (the Actual values change). If the Reference
Load radio button is selected, after the model conversion the Nominal loads will be equal to the reference loads.
Each load (with its existing 5 components) can be converted to up to 5 new components. For each new component, you need to specify its model from the Model pull-down list and its percentage of the Real and Reactive part of the load.
This Model list includes the standard model names plus defined exponential load model numbers. The model of an unused (undefined) component will be “Out”. To view the models or define a new model, click the Add / View
Models button. This opens the Load Models dialog where you can examine the existing models and add new
models as described in section 9.4.
Clicking Convert button will convert the existing components of all the loads in the Load table to the new components, based on the conversion option selected above. If the sum of real or reactive part percentages of the components (shown at the button of the component list) is not 100, you will be asked to confirm to change an “Out” component to “Constant Power” and set its percentages so that the total will be 100. If you respond No, or if none of the 5 components is “Out”, you must change the composition of the 5 components to make the percentages add up to 100 and then click Convert button.
To close this dialog without changing the load models, click Cancel button.
10.8 Delete Out-of-Service
When the active window is the AC Bus table, Generator table, etc., the Delete Out-of-Service command of the Edit | Data Manipulation submenu deletes all out-of-service components in that table.