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Low voltage pre-determining method of distribution and transform district

A low-voltage, platform-based technology, applied in the field of power grids, can solve problems such as difficulty in accurately calculating voltage values

Inactive Publication Date: 2017-02-15
WEIHAI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the method of calculating the voltage value node by node is only suitable for a small amount of data. For the millions of load nodes under the jurisdiction of the power supply company, it is difficult to accurately calculate the voltage value of each node.

Method used

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  • Low voltage pre-determining method of distribution and transform district
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Embodiment 1

[0040] In order to solve the defects in the background technology, the embodiment of the present invention studies the method for judging the low voltage range of the distribution transformer area, see figure 1 , the method includes the following steps:

[0041] 101: Judging the maximum range of low-voltage users based on the operating data of the existing distribution transformer area, equipment data in the area, and user telegraph installations held by the power supply company;

[0042] 102: For the user low voltage information feedback that is outside the maximum user range, it is directly judged as wrong feedback.

[0043] To sum up, the judgment method studied in the embodiment of the present invention converts the traditional method of judging the user's low voltage by calculating the node voltage value into the method of diagnosing the low voltage by range judgment, realizing the transformation from point to line. It greatly improves the efficiency of low-voltage user ...

Embodiment 2

[0045] The following is combined with specific calculation formulas, examples, figure 2 and image 3 The scheme in Embodiment 1 is introduced in detail, wherein, the embodiment of the present invention is researched under the condition of a 220-380V low-voltage distribution network, so following the actual network conditions and characteristics of the low-voltage distribution network, the following research limiting conditions are determined:

[0046] 1. The structure of the back-end power grid in the low-voltage station area is a radial structure, regardless of the ring network.

[0047]2. The back-end power grid in the low-voltage station area is considered according to the symmetrical three-phase parameters, and the unbalanced three-phase situation is considered according to the unbalanced load. The unbalanced three-phase parameters and the commutation of wires mainly occur in the context of high-voltage long-distance transmission networks, which are not applicable Low vo...

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Abstract

The invention discloses a low voltage pre-determining method of a distribution and transform district. The pre-determining method comprises the following steps that a maximal low-voltage user range is determined according to existing operation data of the distribution and transform district, district equipment data and conditions of electricity application and installation mastered by a power company, and low voltage information feedback from a user beyond the determined maximal user range is determined to be error feedback directly. Via the method, the power supply company can determine the possible low-voltage range, low voltage, which is frequent is practicality at present, caused by imbalance of three phases when the load access is unbalanced is analyzed in a focused manner, a trial calculation method for the imbalance degree of the equivalent current before connection is provided, whether selection of access points is reasonable is determined according to increase / decrease of the current imbalance degree as well as change of the low-voltage user range, and the condition that the low-voltage conditions of users become serious due to artificial factors can be avoided before access.

Description

technical field [0001] The invention relates to the field of power grids, in particular to a method for predicting low voltage in a distribution transformer area. Background technique [0002] With the development of the economy, the living standards of residents continue to improve, the nature of electricity consumption has undergone fundamental changes, the demand for electricity has entered a higher level, the contradiction between power supply and demand has gradually intensified, and low-voltage phenomena continue to emerge. However, the long-term mechanism for power grid development has not yet been established, and the comprehensive rectification system measures for low-voltage control are lacking. From a technical point of view, due to objective factors such as random wiring, many network branches, and scattered users, the low-voltage distribution network is often more complicated and chaotic than the high-voltage distribution network. The line account data is not li...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J3/003
Inventor 李峰龚俊祥李杰陈寒冰
Owner WEIHAI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER COMPANY