Study Of City Power Grid Reliability And Economy Of The Plan

With the development of economy, customers' demand on the reliability of the power supply become higher and higher. On the one hand, the customers hope for higher reliability with less money to reduce their outage costs; on the other hand, it is difficult for the supply department to enhance the power supply's reliability because of the limit of money and technology. The best way to solve the problem is to adopt the reliability cost-benefit analysis method which analyze the outage costs of generation side and demand side to find the optimal reliability to reduce the power company and the customer's costs to the least. During the study of the reliability, it is the most difficult to estimate the system's user's outage costs.The outage costs can be regarded as an index to image the unreliability extent and there is the relation between outage costs and reliability index. How to establish the reliability index and how to evaluate it are the basis of the study on the economics of power system reliability. As the important load center of power system, the establishment and evaluation of distribution system's reliability index has his characteristics. Based on the profound study of the operation of urban-network system, this thesis estimate that the establishment of the reliability index should be considered from two aspects namely load point and the whole system, that is they not only describe the operation characteristics of the system, but also image the characteristics of the interruption to the users.This thesis discussed the affection of all kinds of components contingency and the components' position in the line and other factors on the evaluation of load point reliability index. This thesis adopts a integrative method to deal with simple or complex distribution network with the system's practical operation characteristics and the results of the example reveal that it is feasible.The key to study the economics of power system reliability is outage costs. This thesis discusses the conception and classification of the outage costs, and the factors influencing outage costs and the method of outage costs estimation and its advantages and disadvantages are presented, at last customer survey is regarded as a better way to evaluates the outage costs. According to the different characteristics of user's economic activities and the energy consumption, the thesis gives aquantitative analysis on the users' outage costs and gives the outage costs estimation model of three kinds of users (residential sector, industrial sector, commercial sector). By design-survey table, residential users are investigated, and the residential users outage costs are estimated. Based on the profound study of the method which is used to estimate the outage costs abroad, the thesis amends the estimation method which makes the estimation more reasonable with the practical situation in our country. Under a certain calculation circumstance, the thesis adopts two different costs models to calculate a example's outage costs which illuminate that adopting the two models to estimate outage costs is feasible. At last, the outage costs are used on reliability optimization project are theoretically discussed.