Secure Frequency Control of Hybrid Power System Under DoS Attacks via Lie Algebra

Secure frequency control of multi-area hybrid power systems with wind power is a research problem involving active defense, vulnerability, and resilience. Considering the scenario that Denial-of-Service (DoS) attack intrude into the control channels of thermal power and wind farm, the hybrid power system is modeled by a switched system with four subsystems. Then, the exponential stability of hybrid power system is studied under arbitrary DoS attack. An active defense scheme is proposed to design switched control gains by Lie algebra method achieved by a distributed consensus method. Furthermore, following the resulted exponential stability, the load disturbance attenuant performance of frequency control is studied by the proposed concepts of vulnerability point and resilience point. Under a class of event-DoS attack model, the estimation method of vulnerability point and resilience point is given. Finally, simulations of a three-area hybrid power system and NE39bus test system are carried out to verify our theories.

I. Introduction

Hybridpower systems with high penetration of renewable resources have become an important means to achieve carbon neutrality [1], [2]. In recent years, a series of network attack accidents occurred, which caused damage to the power system [3]–[6]. Wide-area distributed hybrid generation units with multi-time-scale dynamic characteristics integrated with open communication networks are vulnerable to network attacks [7], [8]. Thus, security problems of hybrid power systems must urgently be investigated from various perspectives [9]–[14]. In the study of secure control, vulnerability, resilience, and active defense are inevitable problems. Vulnerability analysis is studied with the aim of identifying the attack influence mechanism or cyber-physical permeation influences of hybrid power systems. Resilience analysis is studied to obtain the worst frequency performance under an explicit attack boundary. Active defense is studied to propose control and communication strategies to eliminate the attack influence on the stability. In this study, we focus on the vulnerability, resilience, and active defense of hybrid power system under DoS attacks.