A Network Analysis-Based Distributed Load Shedding Strategy for Voltage Collapse Prevention

This paper proposes a network analysis-based distributed load shedding strategy for voltage collapse prevention. The two-level framework of the distributed load shedding strategy is proposed. The lower one is consisted of local load shedding controllers, and the upper one is designed to coordinate the local controllers to reduce the total load shedding amount. Through network analysis, two sensitivity indices are derived to form local zones, and determine the load shedding locations and amounts. The voltage control sensitivity is proposed for network partitioning. The local load shedding controller is solved by load shedding sensitivity based piecewise linearization. A load shedding sensitivity based linear programming problem is formulated for the center load shedding controller to coordinate the load shedding amounts of local controllers. Case studies have been conducted to verify the effectiveness of the proposed methods.