And Transmission System Reliability Studies

With social progress and economy developing, more industries rely on reliability of power system. Electric becomes not only a sort of energy but also a special commodity. For electric market's need and keeping the advantage of power system with huge capacity and far distance, power system reliability's research becomes very important. Especially in the layout and design of power network, how to find the weakest segment of power network are very important. The department can spend the limited capital on the weakest segment to improve its reliability. Which can come true by using the modern times theory of reliability and with the aid of advanced technology of computer.During last three decades, various types of methods and arithmetic were introduced. A bulk power system including the generation and transmission system is constituted by many kinds of electric equipments. Its structure and operating mode are very complicated because the fault modes are often overlapped and correlated. So it plays very important role in the reliability evaluation of power systems. The research work in this field is at the front of the power system reliability assessment. The research on generation and transmission system reliability is a challenge for us. The main contents of thesis are as follows:1. Present a method for the fuzzy reliability evaluation of composite generation and transmission system. In this method, the fuzzy numbers are firstly introduced to express uncertain data. According to given the model of generation, transformer, transmit line and load in this paper, the various reliability indices express as fuzzy numbers are calculated by employing the fuzzy numbers operation rules. In this method, both the random and fuzzy events are considered simultaneously, and the drawbacks of conventional have been overcome.2. Based on the models and the algorithms, the correspondent program is carried out by VC++6.0.The program flow is given in this paper.