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Phase component fault range finding method based on mu PMU distribution line parameter identification

A technology for fault location and parameter identification. It is used in fault location, fault detection by conductor type, and information technology support systems. It can solve problems such as low communication requirements, high positioning accuracy, and small number of PMUs. The effect of anti-interference

Active Publication Date: 2018-05-18
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both ALSTOM Grid (now General Electric) and Siemens have developed a fault location device for distribution networks based on multi-terminal synchronous measurement. In the prior art, the single-ended information provided by the PMU is used to traverse the line based on the single-ended impedance method Search to obtain multiple candidate fault points, and then use the synchronization of double-ended information to eliminate false fault points. This method needs to configure a small number of PMUs, has low communication requirements, and has high positioning accuracy. However, the elimination of false fault points there are still difficulties

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  • Phase component fault range finding method based on mu PMU distribution line parameter identification
  • Phase component fault range finding method based on mu PMU distribution line parameter identification
  • Phase component fault range finding method based on mu PMU distribution line parameter identification

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Embodiment 1

[0062] The embodiment of the present invention is based on the fault analysis method, extracts the voltage and current information collected by the double-ended μPMU of the line, fully considers the asymmetry of the line parameters, conducts real-time online identification of the self-impedance and mutual impedance parameters of the line, and uses The voltage and current phase components are used for fault location.

[0063] The method provided by the embodiment of the present invention specifically includes the following steps:

[0064] Step 1: Use μPMU to extract the phase components of the synchronous voltage and current at both ends of the line.

[0065] This embodiment provides a phase component fault location method based on the distribution line parameter identification of μPMU. The schematic diagram of the fault location of the double-ended network is as follows figure 1 shown. Common faults in AC distribution network include single-phase ground fault, two-phase grou...

Embodiment 2

[0100] This embodiment provides a phase component fault location method based on μPMU-based distribution line parameter identification. The method is simulated through a simulation platform. The specific simulation process and results are as follows:

[0101] In PSCAD / EMTDC, a single power supply radial distribution network system model with distributed fans is built, such as Figure 4 shown. The fault recorder is used to simulate the μPMU to sample the data, and the sampling period is 200 points / cycle; the simulation conditions are as follows: the AC bus side voltage is 10KV, the neutral point grounding method is ungrounded or grounded through the arc suppression coil, and the transition resistance is 5Ω. The total length of the line is 4Km, the time of fault occurrence is 0.2s, and the duration of the fault is 0.2s.

[0102] (1) Fault location results under different neutral point grounding methods:

[0103] Taking a single-phase ground fault with a distributed fan and a t...

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Abstract

The embodiment of the invention provides a phase component fault range finding method based on mu PMU distribution line parameter identification; the method mainly comprises the following steps: usingthe mu PMU on two ends of the line to gather the voltage current phasor data before and after the fault; carrying out Fourier decomposition for the extracted stable state voltage current so as to obtain the fundamental wave component of the phase value; using the fundamental wave components of the three-phase voltage currents on two ends of the line to determine the line parameters; using the phase components on two ends of the line after the fault to build a matrix equation, and combining the constrained condition and the line parameters so as to determine the unique fault distance. The method introduces the mu PMU to determine the line parameters in real time, thus reducing line parameter errors caused by field construction, line aging and weather factors, solving the range finding errors caused by non-synchronization of the information on two ends, preventing the complex circuit transient analysis, and reducing the computational complexity; the range finding method can use the dual-end impedance method to eliminate the range finding errors caused by transition impedance, and the range finding precision is not affected by the neutral point grounding mode.

Description

technical field [0001] The invention relates to the technical field of distribution network fault measurement, in particular to a phase component fault ranging method based on μPMU-based distribution line parameter identification. Background technique [0002] With the development of society, the penetration rate of distributed power in the distribution network is gradually increasing, which puts forward higher requirements for the precise positioning of the distribution network. The structure of the distribution network tends to be multi-terminal, multi-branched, and complex in structure. In addition, the access of distributed power sources makes the sources of fault current diverse. At the same time, there are load disturbances in the distribution network, which makes fault location in the distribution network a relatively difficult question. In addition, my country's distribution network below 35K mostly adopts a low-current grounding system, with weak fault current, sev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086Y02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor 王小君和敬涵任欣玉张沛王瑞张永杰李军娟
Owner BEIJING JIAOTONG UNIV
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