Remedial Action Scheme (RAS) Modeling in Contingency Analysis
PowerWorld is often asked questions about how to model automated and conditional actions that occur when performing steady-state contingency analysis is PowerWorld Simulator. This type of control action goes by many names including the following.
- Remedial Action Schemes (RAS) or
- Special Protection Schemes (SPS)
- Operating Procedures
PowerWorld Simulator offers a great amount of flexibility to model these control features of the power system. The RAS_Modeling_PowerWorld.pdf document linked above was created in response to a request from the WECC Modeling SPS and Relays Ad-Hoc Task Force (MSRATF) in May 2013 to demonstrate on a concrete example the implementation of this type of modeling in PowerWorld Simulator’s power flow-based contingency analysis processor. This document will serve as a good overview of this type of modeling for everyone.
Section 2 of this document presents the test case which James O’Brien of BPA has put together to serve as the concrete example.
Section 3 covers various structures in PowerWorld Simulator that are used to define a RAS. This the following topics
- Injection Groups
- Advanced Filters
- Model Conditions
- Model Filters
- Conditional Contingency Actions
- Global Contingency Actions.
Section 4 shows how these features are applied to the test example from Section 2.
Section 5 shows the Test Results.
Section 6 contains pages of sample auxiliary files which define both the basic list of contingencies and separately the list of RAS. We also include a list of object labels to demonstrate a naming convention independent of bus numbers or names.
May 10, 2013