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Studies On The Optimal Planning Of Terminal Units In Distribution Automation System Based On The Requirement Of Service Reliability

Posted on:2017-04-19Degree:MasterType:Thesis
Country:ChinaCandidate:Y S MaFull Text:PDF
GTID:2272330503985160Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
With the development of economy and society, the requirement of users about distribution network reliability is becoming higher and higher. Distribution automation is an important means to improve the reliability of power supply and to realize the efficient and economic operation of distribution network. However, the planning and construction of distribution automation is still lack of guidance currently. How to make the limited funds and resources allocation in more economical way as far as possible is a problem urgently to be solved in the planning and construction of distribution automation.Firstly, this thesis introduces the existing assessment methods of distribution network reliability and summarizes the current research status of the distribution automation. The shortcomings of reliability evaluation methods with the consideration of the distribution automation and the planning of the distribution automation are analyzed. Methods of reliability evaluation with the consideration of the distribution automation and configuration optimization algorithms of distribution automation terminal units will be proposed.The second chapter proposes an evaluation algorithm of distribution network reliability considering the influences of distribution automation. Region network composed of regional nodes and switch branch of different degree automation can be got through network simplification, which can greatly reduce the computation of reliability assessment and meet the needs of reliability evaluation for all kinds of complex distribution network. With fault traversal and division of affect state, algorithm proposed in this thesis classifies according to the different influence on the reliability of distribution network. Reliability evaluation of distribution network with different distribution automation mode will be more accurate, so the proposed algorithm can be well used in practical engineering.The thesis puts forward an optimization configuration method of distribution automation terminal units based on mixed integer nonlinear programming. The planning construction mode combined with "two remote" and "three remote" distribution terminal units will be studied. Optimization mathematical models of the planning and the actual operation distribution network will be set up respectively, which specifies the reliability index and obtains investment as less as possible in order to achieve the reliability index. Considering the planning distribution network lacks enough grid information and its structure is not clear, the model of planning distribution network is under the assumption that the feeder load, users and distribution automation terminal units are uniform. The model of actual operation distribution network uses precise analytical method to obtain the number and optimal configuration scheme of different distribution automation terminal units, meeting the constraints of fault impact mode and reliability and so on.An evaluation method is presented to assess the effectiveness of distribution automation planning scheme. Investments and benefits of distribution automation system are comprehensive analyzed. Combining with the engineering calculation methods of power system reliability, two indicators about the investment profit value and cost-effective of the distribution automation system are defined. The final plan will be output according to the phase information in order to implement the most obvious part of reliability enhancement in advance. It is also conducive to the rolling revision of distribution automation planning.The thesis finally designs the optimization program of distribution automation terminal units for the planning and the actual operation distribution system. For example, the actual distribution network of Daya Bay, Hui Zhou District in 2013. The basic situation of distribution network is introduced, and the economic efficiency of optimization results is evaluated to verify the correctness and practicability of the program. The algorithm proposed in this thesis can improve the supply reliability of power system and achieve economic benefits, which will provide scientific support for the decision of power management.
Keywords/Search Tags:distribution automation, distribution network reliability, planning grid, optimization configuration
PDF Full Text Request
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