Impact of Transmission Line’s Real-Time Reliability Model Parameter upon Power System Operational Reliability Evaluation

By use of the concept of operational reliability and evaluation theory, a component’s reliability model based on real-time operating condition is built, in which the impacts of units’ operating mode, real-time fluctuation of power load and variation of power network structure on operational reliability are comprehensively considered. On this basis the modeling principle for component’s real-time reliability is proposed, the hyperbolic function model of transmission line is given, the impacts of the parameter variation of real-time reliability model of transmission line, such as probability statistics of transmission line outage, power flow off-limit threshold of transmission line, rated capacity of transmission line and so on, on evaluation results as well as on the model itself are analyzed in detail, furthermore, the method to choose the parameters of practical real-time reliability model of transmission line is put forward.