Data-driven Dynamic Security Assessment Based on Expanded Electrical Coordinate System

Abstract

Electrical coordinate based on impedance electrical distance is an effective feature expression method of fault location. Applied to data-driven dynamic security assessment, electrical coordinate can improve dynamic security assessment accuracy significantly. Based on the concept of the electrical coordinate system, an expansion method of the electrical coordinate system is proposed, which further improves the accuracy of dynamic security assessment. First, the reasons why the representation accuracy of the electrical coordinate system is low in partial areas are analyzed. The blind point, blind line, and blind area for fault location feature expression are defined. Then, by analyzing the electrical relationship between two points, the judgment criterion of blind lines is determined, and the rapid searching method of blind lines is proposed. Finally, the identification and fine-tuned algorithm of blind area is proposed. The electrical coordinate system is expanded by supplementing reference nodes. And the framework of data-driven dynamic security assessment based on expanded electrical coordinate system is constructed. Taking a provincial power grid as the example, the applicability of the expanded electrical coordinate system in the dynamic security assessment is verified.