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Fault simulation annealing positioning method based on multi-point synchronous measuring data for power distribution network

A technology for fault and synchronous measurement of distribution network, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of limited application scope and inaccurate single-ended positioning method, and achieves improved efficiency, accurate positioning, rich The effect of fault information

Active Publication Date: 2017-12-15
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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AI Technical Summary

Problems solved by technology

The accuracy of the single-ended positioning method is often not accurate enough. The double-ended positioning method is limited by the distribution of monitoring points in the distribution network (considering that there may not be two monitoring points upstream and downstream of the line section where the fault occurs). The scope of application in the network line is also limited

Method used

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  • Fault simulation annealing positioning method based on multi-point synchronous measuring data for power distribution network
  • Fault simulation annealing positioning method based on multi-point synchronous measuring data for power distribution network
  • Fault simulation annealing positioning method based on multi-point synchronous measuring data for power distribution network

Examples

Experimental program
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Effect test

Embodiment

[0086] Build in PSCAD simulation software such as image 3 The simulation model shown. The sampling frequency is 20Khz, the distribution network line voltage level is 10kV, the neutral point is directly grounded, and the power flow direction is from M to N. The length of each line has been marked in the figure. Nodes 1 to 7 are monitoring points, and all monitoring points sample current and voltage data synchronously. In the calculation example results, the distance measurement and positioning results before and after line parameter correction are compared.

[0087] Define the ranging relative error:

[0088]

[0089] like image 3 As shown, the type of fault is A-phase ground fault, and the fault occurs on the main line between monitoring point 1 and monitoring point 2. Firstly, select the line between monitoring point 1 and monitoring point 2 to correct the line parameters. The voltage and current waveforms of monitoring point 1 and monitoring point 2 are as follows:...

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Abstract

The invention provides a fault simulation annealing positioning method based on multi-point synchronous measuring data for a power distribution network. The method includes the steps of monitoring the entire power distribution network through optimized point selection of a PMU device, determining the fault occurring moment according to the fault waveform data acquired by the PMU device, extracting the fault waveform of cycles before and after fault occurrence, correcting and verifying line parameters through waveform data before fault occurrence, analyzing and processing waveform data after fault occurrence, establishing a series of voltage-current equations of fault points and monitoring points through a fault analyzing method in combination with the line parameters, and using a simulation annealing algorithm to obtain the optimal solution for an overdetermined equation to realize accurate positioning of a fault point.

Description

technical field [0001] The invention relates to a fault diagnosis method for distribution network lines, in particular to a distribution network fault simulated annealing positioning method based on multi-point synchronous measurement data. Background technique [0002] my country's medium and low voltage distribution network is dominated by overhead lines, which are complex in structure, numerous in branches, and prone to failures. According to statistics, during the operation of the power system, power outages caused by distribution network faults account for more than 95% of the total power outages, of which 70% are caused by single-phase ground faults or busbar faults. In order to realize the rapid isolation of distribution network system faults and restore the normal operation of the distribution network system, it is necessary to accurately and quickly realize the fault location of the distribution network. [0003] For a single-phase line, set G 0 , L 0 、C 0 , R ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G06F17/11
CPCG01R31/50G06F17/11
Inventor 陈洪涛刘亚东盛戈皞江秀臣
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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