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Medium-voltage power distribution network capacity-to-load ratio calculation method

A calculation method and technology of load capacity ratio, which can be applied in the direction of calculation, electrical components, circuit devices, etc., can solve problems such as the reference range of load capacity ratio of non-medium voltage distribution network, and achieve the effect of improving equipment utilization.

Active Publication Date: 2021-03-19
GUIZHOU POWER GRID CO LTD
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AI Technical Summary

Problems solved by technology

[0002] With the rapid development of the economy and society, the density of power loads continues to increase, and accelerating the planning and construction of distribution networks has become a more prominent problem in the current power grid. However, the selection of variable capacity of medium-voltage distribution networks was a blind spot in the past planning work. The only important evaluation index for the power supply capacity of public transformers in the voltage distribution network is the distribution transformer capacity per household; according to the existing national standards and enterprise standards for distribution network planning, the definition and calculation formula of the capacity-load ratio are proposed, but only for high-voltage distribution The value range of the capacity-load ratio of the network is clearly stipulated, and no reference range is given for the capacity-load ratio of the medium-voltage distribution network

Method used

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Embodiment 1

[0046] refer to figure 1 , which is an embodiment of the present invention, provides a method for calculating the capacity-load ratio of a medium-voltage distribution network, including:

[0047] S1: Determine the voltage level or power supply area, and collect the data of the factors affecting the capacity-load ratio of a certain voltage level or power supply area;

[0048] It should be noted that the factors affecting capacity-to-load ratio include load dispersion coefficient, average power factor, transformer load rate, reserve factor, number of public and special distribution transformers in the area, capacity and load rate, and load growth rate.

[0049] Specifically, the capacity-load ratio is generally calculated according to the voltage level, which refers to the ratio of the total capacity of public substation equipment in a certain power supply area and the same voltage level grid to the corresponding grid supply load; the capacity-load ratio is mainly used to evalua...

Embodiment 2

[0086] refer to Figure 2~4 It is another embodiment of the present invention. In order to verify and explain the technical effect adopted in this method, this embodiment is based on the analysis of actual cases from 2015 to 2019, and uses the means of scientific demonstration to verify the real effect of this method. .

[0087] In 2019, 9% of the 10 kV public distribution transformers in Guizhou Province had a load rate of less than 20%, mainly concentrated in rural power grids. The example mainly focuses on the study of the 10 kV capacity-load ratio of rural power grids in Guizhou Province in 2019, taking 70 rural county-level power grids in the province as units (excluding urban power grids), and analyzing and researching from the GDP, population and area within the county-level power supply jurisdiction . According to the sample statistics, the capacity-load ratio of medium pressure is 4.27, and the standard deviation is 1.75.

[0088] The relationship between the capac...

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Abstract

The invention discloses a medium-voltage power distribution network capacity-to-load ratio calculation method, which comprises the steps of determining a voltage level or a power supply area, and collecting capacity-to-load ratio influence factor data of a certain voltage level or power supply area; establishing a medium-voltage capacity-to-load ratio mathematical model based on the sum of the public distribution and transformation capacities in the power supply jurisdiction of the medium-voltage distribution network and the hierarchical load in the data; calculating a network supply maximum load of 220kv and below and a 10kv distribution transformer maximum load in a jurisdiction according to the acquired data; and based on the calculated maximum load, performing calculating by utilizingthe mathematical model to obtain a medium-voltage capacity-to-load ratio, calculating a medium-voltage capacity-to-load ratio difference value, selecting an error range, obtaining a final capacity-to-load ratio, and finishing calculation. According to the invention, indexes can be accurately managed and controlled, the enterprise investment direction is accurately controlled, and the equipment utilization rate, the enterprise investment benefit and approval control of a 10-kilovolt special interval are effectively improved.

Description

technical field [0001] The invention relates to the technical field of distribution network planning and design, in particular to a method for calculating the capacity-load ratio of a medium-voltage distribution network. Background technique [0002] With the rapid development of the economy and society, the density of power loads continues to increase, and accelerating the planning and construction of distribution networks has become a more prominent problem in the current power grid. However, the selection of variable capacity of medium-voltage distribution networks was a blind spot in the past planning work. The only important evaluation index for the power supply capacity of public transformers in the voltage distribution network is the distribution transformer capacity per household; according to the existing national standards and enterprise standards for distribution network planning, the definition and calculation formula of the capacity-load ratio are proposed, but o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q30/02G06Q50/06H02J3/00
CPCG06Q10/0637G06Q10/06393G06Q10/067G06Q30/0201G06Q50/06H02J3/00H02J2203/20Y04S50/14Y02E40/70
Inventor 贺墨琳陈露东高华唐学用卢嗣斌邓朴李丽娟刘振铭罗宁张彦蒋泽甫刘金森
Owner GUIZHOU POWER GRID CO LTD
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