Centralized Load Shedding Based on Thermal Limit of Transmission Lines Against Cascading Events

TL;DR

This paper proposes an online load shedding method based on thermal limits of transmission lines to prevent cascading failures and system collapse, validated through simulations on a standard test system.

Contribution

It introduces a real-time contingency analysis approach that dynamically updates load shedding locations based on line thermal limits to enhance system stability.

Findings

Effective prevention of line outages during severe contingencies

Improved system stability through adaptive load shedding

Validated method on IEEE 39-bus test system

Abstract

Load shedding is the last and most expensive control action against system collapse and blackout. Achievement of an efficient emergency control to stabilize the power system following severe disturbances, requires two key objectives. First, preventing of further cascading outages, i.e. saving the available and determinant power system elements and second, issuing proper control actions to stabilize the power system inside the permissible time frame. In this paper online contingency analysis is performed to monitor secure and reliable operation of transmission lines. Load shedding locations are continuously updated based on loading rate/thermal limit of lines to prevent their outage. Simulation of severe contingencies carried out on 39 bus IEEE standard test system in DIgSILENT power-factory validates the efficiency of proposed method.