含微网的配电系统可靠性评估-电气工程专业论文.docxVIP

三 三 峡 大 学 全 日 制 专 业 学 位 硕 士 学 位 论 文 PAGE IV PAGE IV Abstract The continuous developing of the social and the economic makes people’s living standards have been improving, so that the requirements of power quality are increasingly high, and the reliability of the distribution system is also more and more attention has been paid. Objective and quantitative reliability evaluation of distribution system can explore the weakness and point out a way for power system planning, operation and maintenance, in order to achieve the goal of keeping security, stability and reliability of distribution system operation. With the development of distribution generation and related technology, as well as the environment and energy issues facing, in order to make better use of distribution generation, based on the distribution system, the concept of microgrid was introduced. Microgrids’ independence and flexibility are used to improve the reliability of distribution system. The reliability evaluation of distribution system with microgrid is a new problem associated with the rapid development of the microgrid in the recent years. Due to the access of microgrid, the radial structure and the single-ended power supply of traditional distribution system has been changed greatly, therefore an urgent need to study the reliability evaluation of distribution system with microgrid. In this paper, the microgrid would bee accessed based on the existing distribution system, and make a reliability evaluation on the distribution system with microgrid. In this paper, the characteristics of distribution generation in the microgrid and the typical structure of the distribution system with microgrid is given. Further more, the operation mode and the control strategies of microgrid are analyzed. Then, describe the reliability indices and algorithm of traditional distribution system, and the reliability evaluation model such as the two-state mode and three-state model, load model, co-generation system m