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Integrated Power System Vulnerability Analysis Considering Protection Failures Xingbin Yu, Studenr Member, IEEE, and Chanan Singh, Fellow, IEEE Abstract-Protection system failure is one of the main causes of cascading outages. This paper proposes an integrated scheme to study power system vulnerability considering protection system failures. In this scheme, both adequacy and security reliability analysis are conducted. A protection system reliability model including two major failure modes is adopted to demonstrate their effects on power system reliability. The mechanism and scheme of protection systems have been analyzed for their contribution to cascading outages as well as system stability after a fault OECUTS. All contingencies and the consequent responses in the power system alp depicted in their inherent stochastic manner. The power system vulnerability is assessed by both adequacy indices such as BIP (Bus Isolation Probability), LOLP (Loss of Load Pmhability), EPL (Expected Power Loss) and the security index POS (Probability of Stability). In addition, a new vulnerability index, ISV (Integrated System Vulnerability), is introduced to give a more comprehensive description of the system Vulnerability. Non-sequential Monte Carlo simulation approach is used to implement the stochastic properties of contingencies, protective response and protection system failures. The WSCC-9 bus system is used as the test system Index Terms-Adequacy, Security, Power system, Reliability, Vulnerability, Protection systems, Cascading, Hidden failures. I. INTRODUCTION uring the development of modem power systems, consideration of global system security. While reinforcing the protection systems to guarantee system dependability, the probability of their incorrect operation increases a result of higher complexity. It has been observed that protection system hidden failures commonly lead to multiple or cascading outages, which consequently can cause large-scale power system blackouts. A study by NERC (North American Electric Reliability Council) shows that protective relays are involved in about 75 percent of major disturbances [l]. There have been several large-scale cascading failures in recent times affecting large populations of customers in the Western United States. All of these blackouts are related to protection system hidden failures, which remain dormant when everything is normal and are exposed a result of other D’ protection system dependability has taken priority over The authors gratefully adtnowledge the support fmm Texas Advanced Xin&in Yu is with lhe Depl. of Electrical Engineering. Texas A&M Cham” Singh is with the Dept. of Electrical Ensjneenng, Teras A&M Technolow Program University. College Station, TX 77843 USA (e-mail: xinsbieCue.l;*~,l,ulu).
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good article - Integrated Power System Vulnerability...

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