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Study On Power System Unit Commitment Problem

Posted on:2010-01-13Degree:MasterType:Thesis
Country:ChinaCandidate:X L HeFull Text:PDF
GTID:2132360278462987Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
Unit commitment is an important aspect of optimal operation of power system. Since it could bring in significant annual financial savings in power generating cost, it continues to be the main optimization task in everyday power generation schedule. In the view of mathematics, it is a NP hard combinatorial optimization problem with many constraints and it is difficult to find the optimal solution in theory. So far, there is still not a practical algorithm which can not only consider all the constraints but also achieve an ideal computing speed and accuracy. How to improve the accuracy and speed of solving the unit commitment problem is still of great significance to the optimal operationg of power system.In this paper, based on summarizing the existing research results, we construct the mathematical model of unit commitment on the principle of being as consistent with the actual system as possible. Then we point out that transforming the objective function and constraints between themselves and to each other is a usefull way of handling the actual problem. On the basis of comparing the advantages and disadvantages of various algorithms, and guided by the optimization theory, we propose a new algorithm—mixed integer programming based on interior point method, design a complete and detailed framework for the algorithm, and implement it by the Matlab programming, then put it into the use of computing the basic and security constrained unit commitment for several systems. The results of comparative analysis show that the algorithm can deal with various constraints easily and efficiently, and has good calculation speed as well as excellent solving results. Finally, how the environmental costs could be taken into account in the unit commitment is discussed, and then a combined energy-saving and emission- cutting dispatch model is put forward, which can not only be solved by the existing algorithms conveniently, but also achieve a reasonable compromise in economy and environmental protection.
Keywords/Search Tags:unit commitment, interior point method, mixed integer programming, network security constraint, energy saving and emission cutting
PDF Full Text Request
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