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Short-circuit current zero prediction method and system

A short-circuit current and prediction method technology, which is applied in the direction of measuring current/voltage, measuring device, and measuring electrical variables, etc., can solve problems such as wrong prediction results, improve accuracy, reduce electrical erosion of contacts, and improve safe operation level Effect

Inactive Publication Date: 2017-11-07
HUAZHONG UNIV OF SCI & TECH +1
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AI Technical Summary

Problems solved by technology

[0004] The zero-point prediction of short-circuit current can be transformed into a nonlinear pattern recognition problem. The existing short-circuit current prediction methods based on least squares and derived recursive least squares (RLS) are limited by the accuracy of the model. Once the real The components in the current deviate from those in the prediction model, which can easily lead to errors in the prediction results

Method used

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  • Short-circuit current zero prediction method and system

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Embodiment 1

[0050] Such as figure 1 As shown, it is the application background of short-circuit current zero point prediction. Equivalent the power transmission lines that need to be predicted in the power system network, and establish an equivalent double-ended power supply structure. Of course, the focus of this embodiment is on the prediction method, so the embodiment of the present invention is not limited to the above-mentioned structure, as long as the prediction method can be implemented and the technical problems existing in the background technology can be solved, other power transmission line structures are also possible, wherein, The dotted arrows in the figure represent the current flow.

[0051] When a power fault 2 occurs on the power transmission line 1 , the current flows from the left system 4 to the power fault 2 on the power transmission line 1 through the circuit breaker 3 until the right system 5 . The zero-point prediction of the short-circuit current in this embodim...

Embodiment 2

[0080] A short-circuit current zero point prediction system 200, such as Figure 6 shown, including:

[0081] The support vector machine model building module is used to train the support vector machine model according to the obtained offline data of the power transmission line. The offline data includes performance parameters and single-phase ground fault parameters

[0082] The online data acquisition module is used to collect the current data in the circuit in real time including the occurrence of a single-phase ground fault, obtain the corresponding relationship between current data and time, and determine the initial moment of the occurrence of a single-phase ground fault

[0083] The zero point prediction module is used to calculate and obtain the short circuit current zero point according to the corresponding relationship, the starting time, the preset prediction data window length and the support vector machine model.

[0084] Among them, the support vector machine mo...

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Abstract

The invention relates to a short-circuit current zero prediction method. The method comprises the steps that according to obtained offline data of an electric power transmission line, a support vector machine model is obtained through training, wherein the offline data includes performance parameters and single-phase earth fault parameters; the corresponding relation between time and current data is obtained according to the current data obtained when a single-phase earth fault happens in an online real-time collecting circuit, and the starting moment when the single-phase earth fault happens is determined; according to the correspondence, the starting moment, a preset predicted data window length and the support vector machine model, a short-circuit current zero is obtained through calculation. The zero prediction precision is improved, the purposes of shortening the circuit breaker on-off arc blowout transition process and reducing contact electric erosion are achieved, and the safety operation level of a power grid is increased.

Description

technical field [0001] The invention relates to the technical field of relay protection and automation of power systems, in particular to a short-circuit current zero-point prediction method and system. Background technique [0002] In recent years, with the continuous improvement of circuit breaker performance, the operating time of the circuit breaker's operating mechanism has become shorter and shorter, and the discreteness has become smaller and smaller. The realization of phase-controlled breaking has gradually met the conditions for engineering applications. However, when a fault occurs on a power transmission line, the disconnection of the line by the circuit breaker cannot meet the development requirements of today's power grid. [0003] When the current transmission line fails, the timely disconnection of the line can reduce the contact arcing time and prolong the operating life of the equipment. Moreover, when the arc is extinguished at the target zero point, the ...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06K9/62G01R19/175
CPCG01R19/175G06F30/20G06F18/2411
Inventor 林湘宁陈乐李正天刘畅彭咏泉
Owner HUAZHONG UNIV OF SCI & TECH
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