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Security is one of the biggest concern in power system operation. Recently,the emerging cyber security threats to operational functions of power systemsarouse high public attention, and cybersecurity vulnerability thus become anemerging topic to evaluate compromised operational performance under cyberattack. In this paper, vulnerability of cyber security of load frequencycontrol (LFC) system, which is the key component in energy manage system (EMS),is assessed by exploiting the system response to attacks on LFCvariables/parameters. Two types of attacks: 1) injection attack and 2) scaleattack are considered for evaluation. Two evaluation criteria reflecting thedamage on system stability and power generation are used to quantify systemloss under cyber attacks. Through a sensitivity-based method and attack treemodels, the vulnerability of different LFC components is ranked. In addition, apost-intrusion cyber attack detection scheme is proposed. Classification-basedschemes using typical classification algorithms are studied and compared toidentify different attack scenarios.

Vulnerability Assessment of Load Frequency Control Considering Cyber Security