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Extension of Full Topology Models in PowerWorld Simulator Version 24

This is the abstract and a link to the presentation associated with the PowerWorld Corporation webinar of Wednesday September 18, 2024.

Link to Presentation: Extension of Full Topology Modeling in Simulator Version 24

Title: Extension of Full Topology Modeling in Simulator Version 24

Abstract:

PowerWorld Simulator introduced Integrated Topology Processing (ITP add-on) in 2008 to work with full-topology node-breaker models in the power flow. PowerWorld’s work over the past 15 years with dozens of companies has always interacted directly with input data structures available from the EMS models. Special features for instructing the software in tools such as contingency analysis to automatically determine breakers necessary to isolate a device have been created, as well a feature to perform the opposite task of finding presently open disconnects that need to be closed in order to return a line to service in an outage management tool.

This presentation will not focus on all the features of ITP, but will instead focus on the history of connecting software tools such as PowerWorld Simulator within the EMS ecosystem.  Tools within the EMS ecosystem that we have experience connecting to include the EMS itself, outage management tools, load and generator forecasts, ICCP measurements, oneline diagram tools, and so on.  These connections to other software tools required the addition of a Substation object in 2000, the introduction in 2001 of ObjectLabels for identifying devices using string identifiers that allow software tools to interact, and then addition of a designation of a BranchDeviceType in 2007 so that PowerWorld Simulator could distinguish between Lines, Breakers, Disconnects, Load Break Disconnects, and so on.

The presentation will then discuss two fundamental concepts that must exist within any software tool that interacts with EMS software models and then a third concept that is only necessary to interact with PSS/E files. Concept #1 is a connection point that represents where devices connect with each other and also represents a potential location of a unique per unit voltage phasor.  Concept #2 is a group of connection points connected together by closed switching devices – which is purely a software concept.  The words Node and Bus are sometimes used for these concepts, but the presentation will discuss how the words used for these concepts are not consistent between software tools. Concept #3 is a user-defined grouping of connection points that has been added within the PSS/E RAW file data structure for node-breaker models. PowerWorld calls this user-defined grouping a FixedNumBus, and PowerWorld Simulator Version 24 Beta has been released with support for these. The FixedNumBus is not necessary when modeling a power system and has not existed in the EMS ecosystem before, but is needed to support reading files that link to devices defined in a RAW file. The concept is not necessary to read a RAW file by itself, and PowerWorld Simulator Version 23 and earlier are able to read such RAW files.  However, the FixedNumBus concept is necessary when reading another file such as *.con files that reference devices in the RAW file using the “Bus Numbers”.

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September 9, 2024