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Research Of Reliability, Economy And DG In Distribution System

Posted on:2009-01-27Degree:MasterType:Thesis
Country:ChinaCandidate:B PengFull Text:PDF
GTID:2132360245494857Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
Distribution system is the directly connected part of the whole power system to customers. Study of the reliability of distribution system, which is concerned by power utility and customers, at the same time, is an important research direction of power system. The essential objective of the research on distribution system reliability is to provide safety, reliable electric power to customers and gain the maximum benefit for society.The algorithm of reliability evaluation is an important subject in the power distribution system reliability research. A new method based on successful probability to the evaluation of the distribution system reliability is developed in this paper. An example is introduced to show how to evaluate the complex distribution system reliability, which is based on analyzing the working mechanism of the distribution system. The example also compared the new developed method with other traditional methods showing that the new method has advantage in programming, calculating speed and accuracy. Factors influencing the distribution system reliability are also analyzed and some useful measures are proposed to develop the reliability of distribution systems from the viewpoint of reliability management.The reliability cost and the reliability benefit is opposite in distribution systems. The objective function of the optimization investment strategy of the distribution systems is presented by combining the reliability cost with the reliability benefit in this paper. The consequences of outage to the systems with different deployment schemes of the disconnect switches are analyzed and compared. A theorem is proposed on how to deploy the disconnect switches on the beginning of the main feeder to achieve the best overall benefit. Whether the fuse should be mounted and whether the standby transformer should be prepared in the load branch is particularly discussed and two criterions about this issue are also proposed. The investment strategy of the distribution system network is carried. The lowest cost scheme is found by combining the losses with the investment, which considers the investment strategy both of the utility and of the customer. The scheme is also validated by a test system and a real system; results show that the scheme is right and practical.Along with the development of power technology, distributed generation (DG) has been connected to power system widely. Three kinds of DG models are discussed in this paper and an evaluating method based on analytics is discussed for the distribution power system containing DG. The method proposed consider DG as a special power resource which has the characteristic that the generated power would be affected by many different stochastic factors. The concept of "islanding probability" is introduced to assist in modeling system reliability. A simple test system is utilized to compare three DG models and result shows the impacts among different DG modeling manners.
Keywords/Search Tags:distribution system, reliability evaluation, cost and benefit of reliability, distributed generation
PDF Full Text Request
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