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Study On Optimal Configuration Of The Sectioned Switches In Distribution Network

Posted on:2008-07-16Degree:MasterType:Thesis
Country:ChinaCandidate:J F LiFull Text:PDF
GTID:2132360245991929Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
Distribution network locates at the end of power system. Due to its direct connection with users, the quality and ability of power is guaranteed by it. With the economy developing and power load increasing rapidly, the higher power supply reliability and power quality is required by customers. The power system rapidly development also requires that the urban distribution network planning and designing should be paid more attention. However, urban distribution network construction lags a lot behind power supply and requirement; several problems are becoming more serious, such as the outmoded devices, lack of power supply capacity, unreasonable distribution network structure and low power supply reliability.Recently, more and more distribution network reforming projects are carried out in many areas, but the problem of paying more emphasis on devices reform but less on distribution network optimum still exists. And it is more necessary to locate the weakness of the distribution network and select the proper connection modes, not to simply widen the conductor section or increase the capacity of substations. Therefore, the current section or tie of distribution network should be planned and reformed, especially when feeder corridors or power land is absence, the feeders load ratio can be increasing by setting reasonable section or tie switches along the feeders, so the optimum of switches is much more important to analyze.The optimal configuration of sectioned switches in distribution network is a combined optimization problem with non-linear objective, which should satisfy both economy and reliability indices. A bi-level optimization method is presented to identify the optimal number and placement of sectioned switches in distribution network. The objective function of the method includes annual investment and maintenance cost of sectioned switches and customer outage cost. In the outer optimization, bisection method is proposed to approximate the optimal switch number. In the inner optimization, the optimal placement of sectioned switches can be determined by taking the energy not supplied as an assessment index. Actual examples show that the method is feasible and effective.
Keywords/Search Tags:Distribution network, Sectioned switches, Bisection method, reliability, Energy not supplied
PDF Full Text Request
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