Least square positioning algorithm for distribution network faults

A technology of least squares and positioning algorithm, applied in fault location, fault detection according to conductor type, measurement device, etc., can solve the problems of inaccuracy, limited application range of distribution network lines, lack of accuracy of single-ended positioning method, etc. The effect of precision

Active Publication Date: 2017-11-07
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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Problems solved by technology

However, the accuracy of the single-ended positioning method is still lacking, and it is often not accurate enough; and the double-ended positioning method is limited by the distributi

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  • Least square positioning algorithm for distribution network faults
  • Least square positioning algorithm for distribution network faults
  • Least square positioning algorithm for distribution network faults

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Embodiment Construction

[0050] A preferred embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the technical means, creative features, goals and effects achieved by the present invention can be easily understood.

[0051] For a single-phase line, set G 0 , L 0 、C 0 , R 0 are the conductance (usually negligible), inductance, capacitance and resistance of a given line unit length, respectively, and ω is the angular frequency of the system, and the propagation coefficient γ and characteristic impedance Z of the single-phase line are obtained c They are:

[0052]

[0053] The transmission line equation is established by two monitoring points 1 and 2 on the single-phase line (need to be on a branch road):

[0054]

[0055] Among them, l represents the distance between monitoring point 1 and monitoring point 2; Respectively represent the voltage and current sampling instantaneous values ​​of monitoring point 1 and monitori...

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Abstract

The invention relates to a least square positioning algorithm for distribution network faults. The method comprises steps of S1: setting a plurality of fault detection points on a distribution network line and synchronously acquiring current and voltage waveforms; S2: selecting any line having faults at two ends, and correcting parameters per line unit length; S3: performing Karrenbauer transform three-phase decoupling on the current and voltage waveforms of the fault detection points; S4: multiplying the corrected parameters per line unit length by the line length to get corrected parameters of the line; S5: combining the corrected parameters of the line, and establishing the voltage and current equations of the fault point and each fault detection point; and S6: using the least square algorithm to solve the system of equations to obtain the best estimation value of the fault distance. The algorithm utilizes the voltage and current waveforms before the fault occurs to correct the line parameters. After the fault occurs, the voltage and current equations between the fault point and the fault detection point are established through the fault analysis method according to the line parameters to realize the precise fault location.

Description

technical field [0001] The invention relates to a method for diagnosing a distribution network line fault, in particular to a distribution network fault least square positioning algorithm based on multi-point synchronous measurement data. Background technique [0002] At present, the distribution network system of medium and low voltage in my country is dominated by overhead lines, whose line structure is complex, with many branches, and is very prone to failure. 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; and 70% of them are caused by single-phase ground faults or busbar faults. In order to realize the rapid isolation of distribution network 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] In the prior art, the res...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 陈洪涛刘亚东盛戈皞江秀臣
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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