A planning method and device for an active distribution network

Abstract

The invention discloses a planning method and device for an active power distribution network. The planning method comprises the steps of establishing a network frame planning model of the active power distribution network with the lowest comprehensive economic cost serving as the target and a first vector of the feeder line type and a network topology of a representation system serving a control variable; establishing a DG configuration model of the active power distribution network with the optimal improvement degree of the 'load flow-voltage-network loss' comprehensive coordination degree between a DG device and the active power distribution network serving as the target and with the installation position of the DG device in the presentation system and a second vector of the configuration unit number of the installation position serving as a control variable; conducting iteration solving on the network structure planning mode and the DG configuration model through a preserved algorithm to obtain an optimal solution of the first vector and the second vector, and making the optimal solution serve as a planning scheme of the active power distribution network. From the point view of overall coordination planning of the distribution generation device and a network structure, the optimal coordination of the development of a power grid and the DG device is achieved while the power grid has good economical efficiency as a whole.

Description

technical field [0001] The invention relates to the technical field of power system optimization planning, in particular to a planning method and device for an active distribution network. Background technique [0002] Under the background of continuous growth of power load, increasing shortage of traditional energy sources and increasingly serious environmental pollution, the electric power industry is facing enormous pressure. Distributed generation (DG) is attracting more and more attention due to its flexible operation mode, diverse energy sources and environmental friendliness. [0003] With the large-scale access of various DGs, the power distribution system will gradually evolve from a traditional passive network to an active distribution network (ADN). Features will change significantly. If the location or capacity of DG access is unreasonable, it will bring significant impact on the safety (such as line overload), economy (such as increased network loss cost) and ...

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Problems solved by technology

[0006] 1) Regardless of independent or sequential optimization, it essentially artificially separates the natural internal connection between DG and grid structure and ignores the interactive influence of one party's planning decision on the optimality of the other party's planning scheme. Therefore, the final planning It is difficult to ensure that the scheme has global optimality (that is, to achieve the optimality of the system as a whole pursued by the planner in a specific aspect)

[0007] 2) At present, most of the existing models lack the consideration of the coordination between DG configuration and power grid planning. Since the objective function setting cannot quantitatively characterize the influence of DG large-scale grid connection on various electrical parameters of the power grid, it is not consistent with DG Compared with the original passive distribution network before grid-connection, the final planning scheme obtained has the risk of "not rising but falling" in terms of system security and economy (specifically, it can be manifested as increased network loss, decreased voltage quality, and line overload. Wait)

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