Security load frequency control of networked power systems via Round-Robin protocol under denial of service attacks

This paper studies the security control of interconnected power systems, considering the impact of denial of service (DoS) attacks and the cut-in of renewable energy sources. Considering the rising occurrence of DoS attacks in network control, a unique security event triggering mechanism (SETM) is introduced, which incorporates the dynamic changes in triggering conditions caused by DoS attacks. It aims to mitigate the impact of DoS attacks on packet transmission. Furthermore, the concept of switching systems is employed to incorporate a Round-Robin protocol into the control method. This protocol expands a single controller into multiple switching controllers, which effectively mitigates performance losses in the power system and minimizes state fluctuations during significant disturbances. A stability criterion relying on the linear matrix inequality (LMI) is provided to ensure the closed-loop asymptotic stability of power systems, and the controller parameters are determined through dynamic output feedback (DOF) rules. Finally, applying the proposed method to the New England 39- bus power system divided into two areas of interconnected power system, simulation results demonstrate that the proposed control method effectively ensures power system stability and outperforms the conventional load frequency control (LFC) method.