Hierarchical modular power network planning scheme optimization method

Abstract

The invention provides a hierarchical modular power network planning scheme optimization method. The method includes the steps that (1) a county-level planning unit serves as a minimum unit of a calculation system of the method, and the calculation problem of the capacity-load ratio of an interconnected area is solved by means of division coefficients; (2) a calculation system is built on the basis of the method, and imbalance degrees, such as the largest load imbalance degree, the coincidence factor imbalance degree and the capacity-load ratio imbalance degree, of indexes in a target area are obtained quantitatively; (3) sensitivity of the capacity-load ratio to an item is analyzed, the concept of a sensitivity coefficient is put forward and accordingly influences of operation of the item on the capacity-load ratio of the area are weighed; (4) a load prediction method in a new planning period is put forward, according to the method, a hierarchical modular analysis concept is adopted, firstly, the whole load prediction work is divided into different levels of load prediction according to a certain rule, the natural growth rate of the load of each level is solved level by level, and ultimately the largest load of each level of a power grid at the end of the planning period is solved from bottom to top.

Description

technical field [0001] The invention relates to a method for calculating indexes of hierarchical modularized power grid planning, and belongs to the technical field of electrical engineering planning. Background technique [0002] Power grid planning indicators are the basis of planning scheme formulation, and also the most fundamental problem facing planning work. With the long-term shortage of power grid construction funds, the requirements for internal and external management of power grid development are increasing day by day, especially with the deepening of large-scale planning system, discussion and practice, it is required that power grid planning must be lean for power grid projects in the next two years Planning, the informatization of power grid planning business has also been put on the agenda. In order to realize the informatization of planning business, it is necessary to ensure the accuracy and standardization of basic data. Therefore, it is very necessary t...

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Problems solved by technology

[0006] 2) Lack of description of sub-voltage levels

[0007] 3) The principle of power output calculation is not clear

However, in actual work, due to the confusion of concepts and unclear principles, planning engineers of prefectural and city companies often include the output of 110kV ground-regulated power supply in the annual maximum load value when compiling the planning report, which is not deducted when calculating the capacity-to-load ratio. Calculation results that the network supply load is too large and the substation capacity shortage is too large

[0009] 4) The principle of special variable load calculation is not clear

Otherwise, the calculation result cannot match the annual maximum load of the upper level

[0010] 5) Substation loads of county company assets are easily miscalculated

Conversely, when the county company does statistical calculations, it will also omit the substation load of the provincial company's assets

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