A method for describing electrical parameters of distribution network lines

Abstract

The invention discloses a method for describing electric parameters of distribution network lines. According to the method, any line can be considered as a uniform model: for any distribution network line, a lead of the distribution network line externally extends through being erected on a pole; the distribution network lines can be divided into a trunk line and branch lines, the branch lines have different lengths and directions, and secondary branch lines are possible to exist under the branch lines; the leads can have different models and lengths; segmented / branch switches are possible to exist on the leads and distributed power supplies are possible to exist on the secondary branch lines; and for the lines which for a looped network in a hand-in-hand manner, the lines can be connected through being considered as lines or a plurality of models. The invention provides the uniform model and a description method, the electric parameters of all the lines can be obtained through a same format and the storage is convenient; and when circuit parameters need to be calculated, calculation is directly carried out on matrixes without repeatedly querying lead parameters and accumulated line lengths, so that the rapid and accurate calculation of software can be realized and the calculation time is greatly shortened.

Description

technical field [0001] The invention relates to a method for describing electrical parameters of distribution network lines, belonging to the technical field of electric power distribution networks. Background technique [0002] The distribution network line usually refers to the 10kV power supply line in the power system, which plays an important role in transmitting electric energy to users. The voltage level of distribution network lines is low and the number of lines is large. At present, in the process of power grid operation and maintenance and management, the most widely used method of describing distribution network lines is to draw single-phase wiring diagrams of distribution network lines. The wiring position of the main line and the branch line, the position and capacity of the distribution transformer, the distance between the important contacts of the wire, the type of the wire, etc., the distribution network line described by this method is intuitive and vivid,...

AI Technical Summary

Problems solved by technology

The voltage level of distribution network lines is low and the number of lines is large. At present, in the process of power grid operation and maintenance and management, the most widely used method of describing distribution network lines is to draw single-phase wiring diagrams of distribution network lines. The wiring position of the main line and the branch line, the position and capacity of the distribution transformer, the distance between the important contacts of the wire, the type of the wire, etc., the distribution network line described by this method is intuitive and vivid, and its electrical parameters can be obtained through the search technology Manual, check and calculation. With the development of the power grid, distribution network management is becoming more and more refined. The previous legend method will not meet the requirements of distribution network management and development. This method is not practical in many aspects , there are many deficiencies

(1) The description method of this kind of legend, different operation and maintenance management companies use different methods to draw, the wiring diagram is not uniform, and the amount of information drawn is more or less different, which cannot be used uniformly; (2) When calculating the length of the wire, for different calculation line segments, the length of the line needs to be accumulated separately, and it needs to be accumulated one by one according to the legend, which results in a large amount of repetitive labor; (3) when it is necessary to calculate the circuit parameters, it is even more inconvenient. Model, query the technical manual to obtain the unit impedance of each type of line, and at the same time need to manually read the map, and manually add up each section of the line. Due to the scattered calculation and manual map recognition, not only cannot realize the rapid and accurate calculation of large quantities of computers, but also prone to errors ; (4) Judging the load distribution can only be obtained by estimation. To obtain an accurate distribution, a large number of calculations are required. For complex lines, it is basically impossible to obtain accurate distribution results; (5) After the line is transformed, The one-line diagram needs to be redrawn, and the modification workload is heavy

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