Centralized Dynamic State Estimation Algorithm for Detecting and Distinguishing Faults and Cyber Attacks in Power Systems

TL;DR

This paper presents a centralized Dynamic State Estimation algorithm that effectively detects and distinguishes between cyberattacks and physical faults in power systems, improving grid security and resilience.

Contribution

The study introduces a structured hypothesis testing-based DSE algorithm tailored for microgrids with renewable energy, capable of differentiating cyber and physical anomalies.

Findings

Successfully distinguishes cyberattacks from physical faults in simulations

Enhances reliability and security of power systems against cyber-physical threats

Effective in real-time scenarios with complex anomaly scenarios

Abstract

As power systems evolve with increased integration of renewable energy sources, they become more complex and vulnerable to both cyber and physical threats. This study validates a centralized Dynamic State Estimation (DSE) algorithm designed to enhance the protection of power systems, particularly focusing on microgrids with substantial renewable energy integration. The algorithm utilizing a structured hypothesis testing framework, systematically identifies and differentiates anomalies caused by cyberattacks from those resulting from physical faults. This algorithm was evaluated through four case studies: a False Data Injection Attack (FDIA) via manipulation of Current Transformer (CT) ratios, a single line-to-ground (SLG) fault, and two combined scenarios involving both anomalies. Results from real-time simulations demonstrate that the algorithm effectively distinguishes between cyber-induced anomalies and physical faults, thereby significantly enhancing the reliability and security of energy systems. This research underscores the critical role of advanced diagnostic tools in protecting power systems against the growing prevalence of cyber-physical threats, enhancing the resilience of the grid and preventing potential blackouts by avoiding the mis-operation of protection relays.