Abstract
With the construction of 500kV grid, the 500/220kV electromagnetic looped grid of the received power gird will make short current problems stand out. Effectively and economically, considering the measure of the short current limitation, it is essential to decompose electromagnetic looped grid. Based on grid characteristics, grid operation arrangement should be optimized by strategy. Hence, the aspects, such as topological structure, security and stability, power supply reliability, operation economy and appropriate planning should be considered in decomposing 500/220kV electromagnetic looped grid and establishing evaluation index of the grid characteristics. With calculating constant weight by using maximizing deviation, the incentive-type variable weight multi-attribute decision model is proposed according to variable weight theory. This model guarantees objective analysis of the constant weight and extends discrimination of different potential schemes, simultaneously, the decision model’s effect will be improved from two perspectives of the index and the scheme. Last, based on evaluation index and decision model raised by this article, the real 500/200kV received electromagnetic looped grid will be decomposed and analyzed by different schemes, the accuracy and effectiveness of the conclusion obtained by incentive-type variable weight multi-attribute decision model is verified.
Highlights
With power generation increase in power base and load increase of the load part, the ‘generated-received’ power grid model is more and more obvious [1]
Power system needs to satisfy the principle of security, stability, reliability and economy
The decomposed 500/220kV received electromagnetic looped grid evaluation index established in this article, which comprehensively considering topology structure, power grid operation security, power supply reliability, economy and planning adaptability, can quantitatively describe the overall characteristics of the power grid
Summary
With power generation increase in power base and load increase of the load part, the ‘generated-received’ power grid model is more and more obvious [1]. As 500kV grid construction completed, the grid system impendence is decreased by developed 500/220kV electromagnetic looped grid. Load growth and extra high voltage system appearance will aggravate the short current problems [2], [3]. A large number of power outage problems are caused by received electromagnetic looped grid [4], [5]. 500/220kV received electromagnetic looped grid should be decomposed to satisfy grid operation at the right time.
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