TEPCO-BCU for Transient Stability Assessment in Power System Planning Under Uncertainty

Abstract

After decades of research and development in the direct methods, it has become clear that the time-domain method approach in stability analysis cannot be completely replaced. Instead, the capabilities of the direct methods and the time-domain method should be used to complement each other. The current direction of development is to combine a direct method and a fast time-domain method into an integrated power system stability program to take advantage of the merit of both methods. The TEPCO-BCU is developed under this direction by integrating BCU method, improved BCU classifiers, and BCU-guide time-domain method. TEPCO-BCU has been evaluated on several practical power system models. The evaluation results indicate that TEPCO-BCU works well with reliable transient stability assessment results and accurate energy margin calculations on several study power systems including a 50,000-bus planning case system. Detailed study of TEPCO-BCU and of a commercial time-domain package on planning cases are conducted. The incorporation of uncertainty into power system planning is also discussed.