Reliability Evaluation Of 500kV HanShan Substation Configuration

With the development of our society, power system is becoming more and more large and complicated. At the same time, it is required that power reliability should be better. Thus, the evaluation and improvement of reliability of the power system is paid more attention to. Quantificational reliability evaluation of station and substation is needed in power system planning, safety operation and the selection of equipment type, which also supplies scientific reference to improving availability of facilities, optimal repairing arrangement and improving the weakest part of the system and brings us safety and economical operation.At first, the paper introduce the definition and the characters of power station bus system arrangement, the significance of research on reliability of power station bus system arrangement. Moreover, the basic theory, model and algorithm on reliability evaluation of power station bus system arrangement are also analyzed thoroughly. Simulation of switching action is required in the process of reliability evaluation. Three state Markov model has a simple form, is easy to understand and requires relatively less data. The model, however, can not successfully describe practical renovation actions and existing mutual dependencies. An extended model "uniform n+2 state system Markov model" is proposed based on three state Markov model and applied in the evaluation of substation system. With factors such as active, passive failures, scheduled maintenance, stuck breaker conditions and normally open components incorporated in the generalized n+2 state system model.According to the components reliability and electric parameters of bus systems arrangement of Hanshan substation, this thesis carries out reliability evaluation. And their weak parts are analyzed based on the sensitivity indices, and analyzes the reason why the reliability indices are low and proposes suggestions how to improve the reliability.