Dynamic security analysis for voltage security using Decision Trees

Power systems operations are affected by various contingencies like sudden increase or throw off of load or generator, switching of transmission line, etc. Voltage insecurity is mainly caused due to lack of reactive power at the bus. In this paper, an algorithm based on Decision Tree (DT) is proposed for the assessment of dynamic security of the system considering voltage stability. Voltage Stability Load Index (VSLI) is used as attribute for formulation of Decision Tree (DT). The load shedding and switching of capacitor banks is proposed to avoid voltage insecurity. The extensive case studies on 5 bus and IEEE New England 39 bus system in DigSILENT demonstrates the effectiveness of the proposed scheme.