See Also
The Power Flow List shows detailed information about the system’s power flows in a more traditional text-based form. This information is intended for users who would like detailed flow information about the power flow. Including the per unit voltage at the bus, the bus’ load and generation, and flows on all lines and transformers emanating from the bus. The content of this display (i.e. which buses are included in the list) is governed by the area/zone/owner filters.
To show this display go to the Case Information ribbon tab, and choose Power Flow List from the Case Data ribbon group.
To view flows at just a few select buses you may want to use the Quick Power Flow List instead. For large systems with no area/zone filtering set, it may take Simulator a long time to generate the complete Power Flow List. Note also that this display can show a maximum of 32,767 lines of text. If this limit is exceeded, Simulator will generate a resource error. Either use the area/zone/owner filters to limit the number of devices shown on this display, or use the Quick Power Flow List to focus on a few selected buses of interest.
The Power Flow List allows you to navigate through the system’s buses rather easily. You can also use the display to show the flows for a bus’ neighbor by double-clicking on the line that reads "TO nnnnn…," where nnnnn is the number of the bus you would like to see. The display is then positioned at this bus. If the bus is in an area and/or zone whose area/zone filter is not set, the area/zone filter is set automatically. In this way, you can inspect the system bus by bus.
The Power Flow List also has its own local menu, which can be viewed by clicking the right mouse button on the display. Select Change Font to modify the style and size of the display’s font. Select Refresh to ensure that the display’s contents concur with the current system state. To skip to particular bus in the list, click Find Bus, which will open the Find Bus Dialog. To display the information dialog for the currently selected branch, bus, generator, load, or switched shunt, select Show Dialog. To print the display, choose the Print local menu option. Choosing Copy enables you to copy the display into the Windows clipboard, from where the information can be pasted into another application. Finally, select Close to close the display.
When printing the display you can either send the results directly to the printer or save them to a text file. To save the results in a text file on the Print Dialog select the Save to File option shown in the lower left corner of the dialog.
For each bus, the following items are shown:
Bus
Shows the bus’ number, name, and nominal voltage in kV. The next four fields are the MW, MVar, MVA and percentage headers for subsequent rows. The next fields specify the per unit voltage magnitude, voltage angle in degrees, the bus’ area number and the bus’ area name.
Generator
For each generator at the bus, the Power Flow List shows the generator’s ID (immediately after the keyword GENERATOR) and the power output of the generator in MW. Following this is generator’s reactive power output in Mvar. A single character is shown immediately after the Mvar field. An ‘R’ indicates that the generator is regulating the bus voltage, ‘H’ indicates that the generator is at its high reactive power limit, ‘L’ indicates that the generator is at its low reactive power limit, and a blank suggests that the generator is set off of AVR. The last field in the GENERATOR item is the MVA output of the generator. If no generators are connected to the bus, this item will be absent from the display.
Load
Shows the total power consumed by each load at the bus. If no loads are present at the bus, this item will be absent from the display.
Shunt
Shows the total power for the fixed shunts at the bus. Positive shunt values denote shunt load, while negative shunt quantities indicate injection. If no shunts are connected to the bus, this item will be absent from the display.
Switched Shunt
Shows the total power for the switched shunts at the bus. If no switched shunts are located at the bus, this item will be absent from the display.
Lines and Transformers
For each line or transformer coming into the bus, the Power Flow List shows the line’s flow and percentage loading. For transformers, the off-nominal tap ratio and phase shift angle in degrees are also shown. Immediately to the right of the off-nominal tap ratio is a two-character designation indicating the tapped side of the transformer: ‘TA’ indicates that the bus is on the tapped side, while ‘NT’ identifies the bus as residing on the side without the tap. You can left- click on this field to immediately reposition the bus to the other end of the line or transformer.