Under Voltage Load Shedding Using Trajectory Sensitivity Analysis Considering Dynamic Loads

Abstract

Under voltage load shedding is a proficient counter-measure action against voltage instability/collapse. UVLS procedure is an effective means to maintain voltage stability of a power system when the system's voltage is just about to collapse following some disturbances. This paper proposes an advanced under voltage load shedding based on trajectory sensitivity analysis for voltage stability enhancement. Trajectory sensitivity analysis is a technique based on linearizing a system surrounding a certain trajectory and employs time domain simulations. This technique computes the sensitivity of the dynamics relating to the constraints. Trajectory sensitivities between bus voltages are calculated by using hybrid system's trajectory sensitivities to obtain sufficient amount for load shedding. Furthermore, trajectory sensitivity index at all buses is calculated to select the most appropriate location of load shedding. Dynamic simulations are performed with the 14 bus RTS IEEE as case study.

Assessing Effectiveness of Research for Load Shedding in Power System

“…Usage of under-voltage load shedding is one of the frequently adopted techniques for addressing the issues of voltage instability. Arief [16] have presented a study that performs trajectory sensitivity analysis for improving the voltage stability factor. The study outcome shows an efficient sensitivity analysis.…”