Distribution line type selection method based on lowest composite cost

Abstract

The invention discloses a distribution line type selection method based on lowest composite cost. The distribution line type selection method includes steps: (1) giving load a peak value Pmax; (2) determining the voltage grade U according to power distribution network correlation techniques; (3) selecting a line series of the voltage grade according to the guide rule of the power distribution network correlation techniques, namely S1, S2...Sn; (4) calculating cost of the selected line series, namely CS1, CS2...CS3, one by one; (5) selecting a line type with the lowest composite cost; and (6) performing allowable voltage loss verification for the selected line and leading the line to be the optimum if the selected line meets requirements. The distribution line type selection method comprehensively considers investment cost, operation maintenance cost, electric energy loss cost, outage loss cost, retired disposal cost and environmental cost of line devices, solves problem that the existing line type selection method cannot reflect whole life cycle cost of the line devices, customer cost and environmental cost, and can achieve lowest whole society composite cost in the line life cycle.

Description

technical field [0001] The invention relates to the field of distribution network planning and design, in particular to a distribution line selection method based on the lowest overall cost. Background technique [0002] The investment of distribution lines accounts for a relatively large proportion in the total investment of the power grid, so it is particularly important to choose lines (conductor materials, cross-sections) reasonably. Choosing conductors of different materials (copper, aluminum, etc.), the investment cost will vary greatly. If the cross-section of the wire is too large, it will further increase the investment in power lines and the consumption of non-ferrous metals; if the cross-section of the wire is too small, the network loss will increase during operation, the power grid operation will be less economical, and the voltage loss will increase. As a result, the voltage at some points in the network does not meet the requirements, and the power quality de...

AI Technical Summary

Problems solved by technology

[0004] (1) This method only considers the line investment cost and power loss cost, does not consider the operation and maintenance cost, decommissioning disposal cost, and cannot accurately reflect the full life cycle cost of line equipment

[0005] (2) This method takes the lowest cost of power grid enterprises as the objective function, does not consider users (power outage loss costs) and environmental costs, and cannot reflect the comprehensive cost of the whole society

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