Bus Mismatches Display

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The Bus Mismatches Display lists the real and reactive mismatches at each bus. The bus mismatches are defined as the difference between the power entering the bus and the power leaving the bus. A power flow case is considered solved when all the bus mismatches are below the convergence tolerance specified on the Power Flow Solution page of the Simulator Options dialog.

Most of the time you will not need to be concerned about the bus mismatches. If the power flow solves, the mismatches are guaranteed to be below the desired tolerance. However, advanced users will find this display useful in determining the cause when a power flow diverges.

The Bus Mismatch Display is a class of Case Information Display and therefore can be used in a manner consistent with all other case information displays. It has a case information toolbar from which you can print, copy, and modify its information as well as view the information dialog of its associated bus. You can find a specific bus mismatch using the name or number of the bus, and you can learn more about the bus by choosing either Quick Power Flow List or Bus View. You can also sort the bus mismatch information by clicking on the heading of the field by which you want to sort.

To show this display select Solution Details > Mismatches from the Model Explorer. You can view bus mismatches only when the application is in Run Mode.

Also note that there is a special feature in the Records menu of the case information toolbar for the mismatch display. This option is Zero-Out Mismatches. Choosing this options will cause Simulator to insert fictitious B and G Bus Shunt values to force the mismatch at every bus to zero.

The Bus Mismatch Display contains the following fields by default:

Number, Name, Area Name

The number and name of the bus and the name of the area in which it is located.

Type

This is the BusCat or category of the bus. This is a string that denotes what equations are being solved at this particular bus inside the inner power flow loop of the power flow solution. A complete description of the theory of the power flow equation and possible BusCat categories are found in other topics.

MW Mismatch, MVR Mismatch, MVA Mismatch

The real and reactive mismatches at each bus, and the total complex power mismatch.