A bulk power system reliability assessment methodology

Abstract

SUMMARYThis paper describes a methodology for the reliability evaluation of bulk power systems. The method encompasses the systematic enumeration of contingencies and the evaluation of their effects on the system over a range of system load levels. Contingencies and electric load levels are described with Markov models. Reliability indices are computed using these models. Both an adequacy approach and a simplified security approach are considered in the effects analysis. The overall framework of the proposed methodology is capable of considering the full security approach but it is not addressed in this paper. In the adequacy approach, an improved system simulation method is used based on the single-phase quadratized power flow (QPF). Remedial actions (RAs) are also applied for the purpose of alleviating system abnormal operating conditions. The adequacy approach determines whether the system is adequate for supplying the electric load without operating constraint violations. In the simplified security approach, the immediate response of the system is of interest. The simulation approach consists of an inertial re-dispatch and operating conditions immediately after a contingency before any controls take effect. The objective is to determine whether cascading failures occur. The proposed methodology has been applied to two reliability test systems.

Review of static risk‐based security assessment in power system

“…Static risk‐based security assessment involves risk identification [17–31] and assessment [32–66] as shown in Fig. 3.…”

Study on hidden failure of relay protection in power system

“…But these researches are aiming at the line protection. Yang focuses on the analysis of hidden failure in circuit breaker t rip mechanism (CBTM ), proposes the hidden failure probability model of CBTM and assessment method to evaluate the power system reliability [37][38][39][40][41][42].…”

Reliability-based nodal evaluation and prioritization of demand response programs

“…State enumeration (SE) and Monte Carlo (MC) simulation are two popular methods that are applied for composite systems reliability evaluation . SE method is very time‐consuming for large power systems or for long‐term studies.…”