Under Voltage Load Shedding for Contingency Analysis to Optimize Power Loss and Voltage Stability Margin

Abstract

Power system contingency is a condition of operation which may be caused due to line outage in a system and could lead to entire system voltage instability. This may further result in voltage collapse leading to total blackout of the system. Therefore, voltage collapse prediction and estimating voltage stability margin is an important task in power system operation and planning. In this paper Line Stability Index Lij utilizing the concept of power flow in a single line is adopted to determine the condition of voltage instability. The purpose of Lij is to determine the point of voltage instability, the weakest bus in the system and the critical line referred to a bus. Analytical approach based technique for load shedding has been developed as a solution for secured operation of power system under various contingency conditions to optimize the power flow in order to minimize the system losses within acceptable limit. To validate the effectiveness of the proposed method simulation has been carried out on IEEE 14 bus system.

A study of power availability in Oleh community in Isoko South local Government area of Delta state, Nigeri

“…It is an effective method of alleviating the problem of system collapse. When the energy provider receives more demand for electrical power than its generating or transmission or installed capacity can deliver, the provider has to resort to rationing of the available electricity to its customers [7].…”

The Method Based on Voltage Stability Margin to Load Shedding in the Power System

“…To find the lowest load shedding amount while taking into consideration the loading capability of network equipment, the authors in [14] use ZIP voltage-dependent load models using mixed integer programming (MIP). Furthermore, reference [15] discusses voltage-based load models and illustrates how these models impact network power equilibrium, the amount of shed load, and the relocation of voltage collapse points in the smart grid. The concept of voltage stability using local measurements forms the basis of the novel way of estimating the margin of voltage stability that is provided in this study.…”

Under voltage load shedding using hybrid ABC-PSO algorithm for voltage stability enhancement

“…UFLS relies most on active power balance while UVLS relies on reactive power balance. The latter is often desirable in systems with a dynamic generation where Automatic Voltage Regulators, tap changers and synchronous condensers are installed [ 7 ]. Over the last decade, blackout reports cite voltage instability as the root cause of cascading grid failure.…”