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A Calculation Method for Line Loss of Small Hydroelectric Power Lines Considering the Maximum Load Duration

A technology with maximum load and duration, applied in the field of power transmission and distribution, it can solve problems such as high loss, and achieve the effect of accurate loss level and reliable data support

Active Publication Date: 2022-04-12
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +2
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Problems solved by technology

Therefore, the line current of small hydropower lines will be stable at high and low levels for a long time in the wet season and the dry season respectively, and high losses will easily occur in the wet season

Method used

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  • A Calculation Method for Line Loss of Small Hydroelectric Power Lines Considering the Maximum Load Duration
  • A Calculation Method for Line Loss of Small Hydroelectric Power Lines Considering the Maximum Load Duration
  • A Calculation Method for Line Loss of Small Hydroelectric Power Lines Considering the Maximum Load Duration

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Embodiment Construction

[0025] One of the commonly used methods to calculate line power loss is the maximum load loss time method, that is, the maximum load utilization hours and power factor , get the maximum load loss hours directly from Table 1 , then use the power loss at maximum load hours with maximum load loss Multiply to get the annual power consumption , and then divided by the annual input power of the line , the line loss rate can be obtained .

[0026] Table 1 Relationship between maximum load loss hours, maximum load utilization hours and power factor

[0027]

[0028] Note: The relationship between the maximum load loss hours, the maximum load utilization hours and the power factor is obtained by Grarunov based on the load conditions of the power grid in the former Soviet Union in the 1940s, using mathematical statistics. my country's electric power design instruction manual It has always been based on this.

[0029] The annual power consumption of the line is:

[003...

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Abstract

The invention discloses a method for calculating the line loss of a small hydroelectric power line taking into account the maximum load duration, the steps are as follows: step S1, select a small hydropower line, query and obtain the resistance value of the line; step S2, query the annual operation status of the line, Draw the annual power curve of the small hydropower line to obtain the annual input power, the active power transmitted by the line at the maximum load, and the power factor at the maximum load; step S3, calculate the maximum load utilization hours; step S4, calculate the maximum load duration Proportion: step S5, calculate the maximum load loss hours; step S6, calculate the line loss rate gamma. The present invention considers the influence of the proportion of the maximum load duration, and can evaluate the loss level of the line more accurately.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution, and in particular relates to a method for calculating line loss of a power grid. Background technique [0002] The grid connection of small hydropower can alleviate the pressure on the grid to a certain extent, increase the voltage at the end of the line, and improve the power quality of the grid. However, since most small hydropower stations are run-of-the-river hydropower stations, they cannot adjust the power generation, and they are mainly distributed in remote mountainous areas, and the local load is relatively small. , the electricity is often unable to be consumed locally, and will be sent back to the superior power grid. [0003] During the wet season, the small hydropower station generates a large amount of electricity, a small part of which is consumed locally, and most of the electricity is sent back to the grid, and the line current remains at a high level ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/06G06Q10/00G06Q50/06G06F16/903
CPCG06Q10/0639G06Q10/20G06Q50/06G06F16/903Y02E40/70Y04S10/50
Inventor 黄扬琪蔡木良刘韬何伟邹进熊健豪陈琛刘卓睿胡柳
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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