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Utilities use the bus/branch model for planning and operations studies. In the bus/branch model, bus numbers are used as unique identifiers. However, bus numbers can change due to addition of equipment, specific substation configurations (splitting buses) or due to equipment outages. This often creates problems because many auxiliary files used in power system studies need to be modified. If the node/breaker...
This paper identifies the issues of using the bus/branch model for operations studies for current hour, next hour and future hours. Need for node/breaker model for contingency analysis is discussed. Major improvements needed to bus/branch model for contingency analysis in the area of contingency definition and contingency analysis is presented. Need to model Remedial Action Schemes (RAS) independent...
This paper discusses issues and solutions when utilizing the node/breaker model to identify voltage instability. This paper describes the reasons why current PV tools generate unrealistic over optimistic static voltage stability limit for bus/branch model and at the same time generate very conservative limit for node/breaker model. The necessary improvements to generate realistic voltage stability...
This paper discusses the BPA experience of implementing Remedial Action Schemes (RAS) in operations studies. The previous methodology of manually including each RAS action as part of the applicable contingency definition is both time consuming and error prone. A more holistic approach was chosen with the goal of allowing automatic deployment of RAS based upon the initial conditions and changes in...
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