Method for evaluating total supplying capability of 220KV Lashou net

Abstract

The invention provides a method for evaluating the total supplying capability of a 220KV Lashou net. The method comprises the following steps of obtaining a space truss structure of the 220KV Lashou net, determining the network node number and the branch number of the space truss structure, and numbering the nodes and the branches of the space truss structure; reading the parameter and the load parameter of the space truss structure as well as the voltage amplitude and the phase angle of a balance node for the numbered space truss structure of the 220KV Lashou net; according to the constraint of the preset node voltage Vi and the phase angle difference deltaij as well as a PQnode and a balance node, obtaining an initialized Newton-Ralfson's method; obtaining an initialized self-adaptive differential evolutionary algorithm; according to the Newton-Ralfson's method, solving the tidal current of the 220KV Lashou net, and processing the tidal current by the self-adaptive differential evolutionary algorithm to obtain the total supplying capability of 220KV Lashou net under a N-1 constraint. According to the method, a district can be taken as a minimum unit to evaluate the total supplying capability, and the total supplying capability of the 220KV Lashou net can be quickly and accurately obtained when the N-1 condition is satisfied.

Description

technical field [0001] The invention relates to the technical field of grid power supply capacity, in particular to a method for evaluating the maximum power supply capacity of a 220KV handle grid. Background technique [0002] With the development of my country's economy and the continuous improvement of people's living standards, the demand for electric energy is also increasing. The growth of power load has accelerated significantly, resulting in the failure of power quality, power supply capacity and power supply reliability to meet the power needs of users, forming many power supply bottlenecks. At present, the urban power grid has basically been built, and it is very difficult to obtain the site of the new substation and the underground passage of the new feeder from the planning and reconstruction of the system. Therefore, it becomes very important to study the maximum power supply capacity of the grid without constructing underground passages for new power stations ...

AI Technical Summary

Problems solved by technology

[0005] The linear programming method is based on the DC power flow model, and does not consider the influence of reactive power and voltage, so it will affect the accuracy and effectiveness of the results; the trial and error method is quite time-consuming, and the accuracy of the results is difficult to guarantee; the maximum load multiple method The solution speed is fast, but it assumes that the load of each node increases in the same proportion, and the accuracy will be reduced

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