System and method for calculating line loss rate of electric power distribution line

Abstract

The invention discloses a system and a method for calculating line loss rate of an electric power distribution line. The system is designed for mainly realizing convenience, rapidness and accuracy of the calculation of the line loss rate of the electric power distribution line. The system comprises a power supply volume acquirer, an electricity sales acquiring device, a terminal acquirer, a low-voltage electricity sales acquirer and a high-voltage electricity sales acquirer, wherein the power supply volume acquirer is arranged on a public line of a power substation and used for acquiring the power supply volume of the electric power distribution line; the electricity sales acquiring device comprises a site management terminal arranged at the high-voltage side or low-voltage side of a special electric power distribution transformer; the terminal acquirer is arranged at a low-voltage user terminal of a public electric power transformer; the low-voltage electricity sales acquiring device is arranged at the low-voltage side of the public electric power transformer; and the high-voltage electricity sales acquirer is arranged on the electric power distribution line of the power substation and connected with the site management system through an optical cable. According to the invention, data of each load terminal is acquired in real time through the electricity sales acquirers without acquiring parameters of the devices in the electric power distribution line in advance, and the line loss rate can be calculated on line.

Description

technical field [0001] The invention relates to the theoretical line loss calculation of distribution network. Background technique [0002] The line loss rate of distribution network is an important index of power system operation economy, and the analysis and calculation of electric energy loss is a frequent work in power system planning, design and operation pipeline. Through theoretical calculation, the distribution law of electric energy loss in the power grid can be found. Through calculation and analysis, management and technical problems can be exposed, and theoretical and technical basis can be provided for the loss reduction work. The benefit makes the line loss management more scientific. [0003] The calculation of line loss rate is a cumbersome and complicated task, especially for distribution lines and low-voltage lines due to many branch lines, large loads, and many data, so the situation is more complicated. There are many calculation methods for line loss ...

AI Technical Summary

Problems solved by technology

[0003] The calculation of the line loss rate is a cumbersome and complicated task, especially for distribution lines and low-voltage lines due to many branch lines, large loads, and more data, and the situation is more complicated

There are many calculation methods for the line loss rate. Manual calculation requires a lot of work, takes a long time, and the calculation results have large errors, which cannot meet the requirements of high efficiency and accuracy in power grid management.

Using various line loss rate calculation softwares that are currently appearing, few of them are highly automated, and most of the original data of the software, such as lines, transformer parameters, voltage on the power supply side, electricity, and electricity sales of loads on the load side, etc. Manual processing, manual processing errors are large, error correction is difficult and cumbersome

[0004] In addition, the method of calculating the line loss rate also uses the traditional network loss measuring instrument to measure the line loss rate online, but there are the following shortcomings: 1. Manually calculating the equivalent resistance needs to draw a circuit diagram first, and the workload is relatively large; 2. Grid structure changes (such as lines, distribution transformer increase or decrease, etc.) need to be redrawn. If the grid changes and the line personnel do not update in time, the calculation error will be greater; 3. "Equivalent resistance" is not really equivalent, and the equivalent resistance is Calculation of rated conditions (such as distribution transformer, meter rated capacity), user load changes, capacitor switching and other factors will affect the accurate measurement of the network loss measuring instrument; 4. It cannot be applied to the reverse direction power flow network measurement of multiple power sources

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