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Distribution network voltage fluctuation positioning method and device

A positioning method and voltage fluctuation technology, applied in the direction of circuit devices, emergency protection circuit devices, automatic disconnection emergency protection devices, etc., can solve the problem of being unable to determine which line the source of voltage fluctuations is located in, grid faults cannot be accurately located, and cannot be timely Overhaul and determination of responsibility and other issues

Active Publication Date: 2014-12-10
STATE GRID FUJIAN ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, simply detecting the voltage characteristic quantity cannot determine the source of voltage fluctuation interference, and it is impossible to determine which line the voltage fluctuation source is located on, which leads to the inability to accurately locate the grid fault, timely repair and determine responsibility

Method used

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  • Distribution network voltage fluctuation positioning method and device
  • Distribution network voltage fluctuation positioning method and device
  • Distribution network voltage fluctuation positioning method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a kind of like figure 1 The distribution network voltage fluctuation location method shown is (1) a distribution network voltage fluctuation location method, which is characterized in that: (1) obtaining voltage and current waveform sampling values ​​from the head end of the distribution network line, constructing a virtual three-phase value, and Specifically, it is assumed that the line voltage waveform satisfies the function shown in formula (1),

[0029] u a ( t ) = 2 U sin ( ωt ) u b ...

Embodiment 2

[0045] A distribution network voltage fluctuation positioning device, including filtering and signal acquisition modules, with ①virtual three-phase electrical signal construction algorithm, ②waveform change judgment algorithm, ③direction signal fx and type signal lx calculation, ④distribution network voltage fluctuation type DSP processor with positioning algorithm function, ARM processor with system parameter setting, system equipment operation status monitoring, and realizing human-computer interaction and report uploading function, Ethernet communication module, display device, the filtering and signal collection The module is based on a digital signal processing unit. The filtering and signal acquisition module is connected to the head end of the distribution network line to obtain the voltage and current waveform sampling values ​​from the head end of the distribution network line. The output end of the filtering and signal acquisition module is connected to the DSP process...

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Abstract

A distribution network voltage fluctuation positioning method and device. A voltage fluctuation generating direction positioning algorithm is adopted, and a voltage fluctuation direction indicator variable is calculated from voltage and current waveform sampling values of the head end of the distribution network circuit, wherein the direction indicator variable fx is +1, 0 or -1; when fx is equal to +1, the voltage fluctuation comes from the lower part of the circuit; when fx is equal to -1, the voltage fluctuation comes from the upper part of the circuit; and when fx is equal to 0, effective information of voltage fluctuation positioning cannot be obtained. According to the distribution network voltage fluctuation positioning device and the distribution network voltage fluctuation positioning method, the voltage fluctuation source direction can be judged according to the voltage and current waveform sampling values of the head end of the distribution network circuit, the fluctuation types are indicated, and the voltage fluctuation generating position is deduced according to directional signals of all the monitoring points.

Description

technical field [0001] The invention relates to a voltage fluctuation positioning method, in particular to a distribution network voltage fluctuation positioning method and a positioning device. Background technique [0002] With the in-depth development of power marketization, power quality issues have attracted more and more attention from power companies and users. Among the many power quality disturbances, distribution network voltage fluctuation is one of the distribution network power quality problems with a high occurrence rate and serious losses. At present, it has been able to accurately monitor the distribution voltage fluctuation phenomenon, which provides a basic first step for analyzing the cause of disturbance and evaluating the hazard of disturbance. However, simply detecting the voltage characteristic quantity cannot determine the source of voltage fluctuation interference, and it is impossible to determine which line the voltage fluctuation source is locate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCH02H7/26G01R31/086H02H3/28
Inventor 邵振国张嫣吴丹岳林焱陈强
Owner STATE GRID FUJIAN ELECTRIC POWER RES INST