Adversity Analysis of Cyber-attacks on Load Frequency Control of Hybrid Power System

Ever increasing power demand and focus on green energy has increased the use of renewable energy resources (RES) leading towards low inertia of microgrid that causes frequency oscillations and may make the microgrid unstable. The frequency regulation activities are maintained by the load frequency control (LFC) in a power system or microgrid. LFC involves data to be sensed at a remote location of power system and then this measured data is communicated over a distance to the controller terminals. The communication network is prone to attacks/threats. So, the frequency deviation for cyber-attack affects all other interconnected areas, and thus threatens the stability of the entire network. This paper focuses on cyber security issues in LFC due to the effect of different cyber-attacks. The sensitivity evaluation is executed to comprehend the feasible threats causing stability failure, and their origin. Variety of attacks, viz. denial of service attack (DoS), false data injection (FDI) attack, resonance attack, are investigated on a multi-source hybrid microgrid. Different type of FDI attacks such as scaling attack, ramp attack, pulse attack and random attack are implemented in this paper. Moreover, multiple nonlinearities like generation rate constraints, boiler dynamics and governor dead band are included in the system model so that the stability of the microgrid can be examined for more realistic situation.