A Method for Determining the Optimal Trading Capacity Between Large-area Power Grids

Abstract

The invention discloses a method for determining optimal trading capacity between large regional grids. The method comprises the steps of firstly, checking the safety of an ultrahigh voltage tie line in a large regional grid and grid ultrahigh voltage tie line synthesizing model, and selecting the minimum of maximum transmission capacities of the tie line under different constraints as a transmission capacity limit of the tie line under a safe constraint; secondly, concluding an economic indicator in an interregional power trading, and establishing a synthetic economic indicator of large regional grid absorption external power; and finally, establishing a proper neighborhood based on optimal tidal current distribution according to the tidal current of a single-target optimization system and the transmission capacity limit of the tie line, and solving a synthetic economic indicator extreme value in the distribution domain, wherein the tie line transmission capacity corresponding to the extreme value is the desired optimal trading capacity. According to the method, the optimal trading capacity between large regional grids at any time period can be analyzed only by updating the large regional grid as well as a transmission channel integrating model and a real-time power price parameter thereof, so as to provide a reference for trading planning and economic scheduling.

Description

technical field [0001] The invention belongs to the field of electric power system technology and economy, and relates to a method for determining the optimal transaction capacity between large-area power grids. Background technique [0002] With the implementation of the national power strategy "West-to-East Power Transmission" and "North-to-South Power Transmission", a large number of UHV AC and DC transmission lines have been built or have entered the construction schedule. On the basis of the power grid, the interconnection through the UHV grid frame is realized. UHV lines have realized cross-regional, long-distance, high-power power transmission and trading, and played a wider role in optimizing the allocation of power resources. However, for several large regional power grids that rely heavily on power outside the region, such as the East China and North China power grids, a series of technical and economic issues such as rational distribution of power outside the reg...

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Problems solved by technology

[0011] 1) The power grid has different safety margin requirements under different operating levels. Although the above methods have taken into account the safety constraints, in different calculation methods, the setting of the safety constraints is arbitrary, and only the safety constraints are considered. A single level, ignoring the comprehensive consideration of security issues

[0012] 2) There are different economic objectives in different market environments, and in non-perfectly competitive markets, different transaction parties have different interest concerns. The economic objective function in the above method only considers the interests of the power generation party or the entire network, and lacks The economic objective function of the position of the power purchaser; there is only an economic function based on the minimum cost of power purchase or power generation, and there is no analysis of the comprehensive economic benefits of power transactions

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