CN104459478A - Double-end fault ranging system based on fault recording data of scheduling power grid - Google Patents

Abstract

The invention discloses a double-terminal fault distance measurement system based on fault recording data of a dispatching power grid, comprising a data interface module, a database module, a data analysis module and a fault distance measurement module, the data interface module, the data analysis module and the fault distance measurement module The ranging modules are all connected to the database module. The double-terminal fault location system of the present invention extracts the three-phase voltage and current before and after the fault by dispatching the fault recording data of the power grid, and converts them into sequence voltage and sequence current by using the transformation matrix to find real-time line parameters, and finally replaces the The method of solving the quadratic equation of one variable is used to obtain the fault distance, thereby reducing the repair time of operating personnel.

Description

A double-terminal fault location system based on fault recording data of dispatching power grid

technical field

The invention belongs to the technical field of electric power, and in particular relates to a double-terminal fault ranging system based on fault recording data of a dispatching power grid.

Background technique

At present, my country is still in a state of tight power supply and relatively weak grid structure. How to improve the power supply reliability of the power system has become a concern of people. According to statistics, the vast majority of power system failures occur on transmission lines.

Due to the long power transmission distance, some lines are more than hundreds of kilometers long, and the road conditions of the lines are complicated, and it is difficult for line patrol personnel to reach. This requires fault location to quickly and accurately determine the fault point according to different fault characteristics. It not only greatly reduces the hard work of manual line inspection, but also can detect faults that are difficult for people to find.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a double-terminal fault ranging system based on the fault recording data of the dispatching power grid, which extracts the three-phase voltage before and after the fault through the fault recording data of the dispatching power grid , current, and use the transformation matrix to convert it into sequence voltage and sequence current to obtain real-time line parameters, and finally obtain the fault distance by substituting the method of solving the quadratic equation in one variable, thereby reducing the repair time of operators.

A kind of technical scheme that realizes the above-mentioned purpose is: a kind of double-terminal fault location system based on the fault recording data of dispatching power grid, including data interface module, database module, data analysis module and fault location module, described data interface module , the data analysis module and the fault location module are all connected to the database module, wherein:

The data interface module obtains the fault recording data in COMTRADE format from the dispatching power grid, and sends the two fault recording data of the corresponding two substations to the database module after parsing and converting;

The data analysis module extracts and analyzes the fault recording data in the database module after analysis and conversion by the data interface module, obtains the three-phase voltage and current values before and after the fault, and analyzes the waveform of the fault recording to obtain the fault type, The data analysis module sends the three-phase voltage and current values and fault types to the database module;

The fault location module extracts the three-phase voltage and current values before and after the fault analyzed by the data analysis module in the database module, and then uses the equation of the fault point voltage to list a quadratic equation to calculate the fault distance , and store the calculation result of the fault distance into the database module, and simultaneously output the calculation result of the fault distance;

The database module stores the fault recording data analyzed and converted by the data interface module, the three-phase voltage and current values and fault types before and after the fault analyzed by the data analysis module, and the fault distance from the fault distance measurement module calculation results.

The above-mentioned double-terminal fault location system based on the fault recording data of the dispatching power grid, wherein the fault location module extracts the three-phase voltage before and after the fault analyzed by the data analysis module in the database module For the current value, the positive-sequence voltage and current value is obtained through the transformation matrix, and then the positive-sequence wave impedance and the positive-sequence impedance value per unit length are obtained from the uniform transmission line, and then the fault distance is obtained through the unary quadratic equation of the fault point voltage.

In the above-mentioned double-terminal fault distance measurement system based on the fault recording data of the dispatching power grid, the database module is also connected to the waveform display module to provide the waveform display module with the waveform data required for display.

Compared with the prior art, the double-terminal fault location system based on the fault recording data of the dispatching power grid of the present invention has the beneficial effect that the impact of distributed capacitance and attenuated DC components on fault location is comprehensively considered, and the dual-terminal fault location system is used Terminal fault recording data before and after the fault, self-calculate real-time line parameters, and calculate the fault distance by solving the one-dimensional quadratic equation. Compared with previous similar products, the calculation process is simplified, and the calculation speed and practicability are improved by obtaining real-time line parameters. .

Description of drawings

Fig. 1 is the structural representation of a kind of double-terminal fault ranging system based on the fault recording data of dispatching power grid of the present invention;

FIG. 2 is a schematic diagram of a hardware structure of an embodiment of the present invention.

Detailed ways

In order to better understand the technical scheme of the present invention, the inventor of the present invention will describe in detail below in conjunction with the accompanying drawings through specific embodiments:

Please refer to Fig. 1, an embodiment of the present invention, a kind of double-terminal fault location system based on the fault recording data of dispatching power grid, comprises data interface module 1, database module 2, data analysis module 3 and fault location module 4, The data interface module 1 , the data analysis module 3 and the fault location module 4 are all connected to the database module 1 .

The data interface module 1 obtains the fault recording data in COMTRADE format from the dispatching power grid, analyzes and converts the two fault recording data of the corresponding two substations, and sends them to the database module 3 .

The data analysis module 3 extracts and analyzes the fault recording data in the database module 2 after analysis and conversion by the data interface module, obtains the three-phase voltage and current values before and after the fault, and analyzes the waveform of the fault recording to obtain the fault type and data analysis Module 3 sends the three-phase voltage and current values and fault types to database module 2 .

The fault location module 4 extracts the three-phase voltage and current values before and after the fault obtained through the analysis of the data analysis module 3 in the database module 2, and then by the equation of the fault point voltage, lists the quadratic equation of one element, calculates the fault distance, and The calculation result of the fault distance is stored in the database module 2, and the calculation result of the fault distance is output at the same time; specifically, the fault distance measurement module extracts the three-phase voltage and current values before and after the fault analyzed by the data analysis module in the database module , the positive sequence voltage and current values are obtained through the transformation matrix, and then the positive sequence wave impedance and the positive sequence impedance value per unit length are obtained from the uniform transmission line, and then the fault distance is obtained through the quadratic equation of the fault point voltage.

The database module 2 stores the fault recording data analyzed and converted by the data interface module 1, the three-phase voltage and current values and fault types before and after the fault analyzed by the data analysis module 3, and the calculation of the fault distance from the fault distance measurement module 4 result.

The database module 2 is also connected to the waveform display module to provide the waveform display module with waveform data required for display.

The double-terminal fault location system based on the fault recording data of the dispatching power grid of the present invention is used by the dispatching department of the power supply company. Therefore, the double-terminal fault location system of this embodiment is installed on the dispatching operation computer 30 of the power supply company. Please refer to FIG. 2 , this embodiment is connected to the communication monitoring system of the fault recording communication device 10 of the power dispatching data network, referred to as the dispatching power grid, and obtains the relevant COMTRADE format fault recording data from the dispatching power grid. The power dispatching data network realizes the interconnection between dispatching centers at all levels and between dispatching centers and substations through VPN (virtual private network), and uses IP routing and switching equipment networking on dedicated channels to transmit fault recording data to the dispatching center The main server 20 of the dispatching center, and the staff can consult relevant information on the dispatching operation computer 30 of the dispatching center.

The double-terminal fault location system based on the fault recording data of the dispatching power grid of the present invention comprehensively considers the influence of distributed capacitance, attenuated DC components, etc. Parameters, the fault distance can be obtained by solving the quadratic equation of one element. Compared with the previous similar products, the calculation process is simplified, and the calculation speed and practicability are improved by obtaining real-time line parameters.

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than as a limitation to the present invention, as long as within the scope of the spirit of the present invention, the above-described embodiments Changes and modifications will fall within the scope of the claims of the present invention.

Claims (3)

1. the Two-terminal Fault Location system based on the fault recorder data of scheduling electrical network, it is characterized in that, comprise data interface module, database module, data analysis module and fault localization module, described data interface module, data analysis module are all connected with described database module with fault localization module, wherein:

Described data interface module obtains the fault recorder data of COMTRADE form from described scheduling electrical network, and after two fault recorder datas of corresponding Liang Ge transformer station are resolved conversion, sends to database module;

Described data analysis module extracts and analyzes the fault recorder data after data interface module parsing conversion in described database module, obtain the three-phase voltage current value before and after fault, and fault type is drawn to the wave form analysis of failure wave-recording, three-phase voltage current value and fault type are sent to database module by described data analysis module;

Described fault localization module extracts the three-phase voltage current value before and after the fault obtained through described data analysis module analysis in described database module, then by the equation of fault point voltage, list quadratic equation with one unknown, calculate fault distance, and by the result of calculation of fault distance stored in described database module, export the result of calculation of fault distance simultaneously;

Three-phase voltage current value before and after the fault that described database module stores and resolves the fault recorder data after conversion through data interface module, obtain through described data analysis module analysis and the result of calculation of fault type and the fault distance from described fault localization module.

2. the Two-terminal Fault Location system of a kind of fault recorder data based on scheduling electrical network according to claim 1, it is characterized in that, described fault localization module extracts the three-phase voltage current value before and after the fault obtained through described data analysis module analysis in described database module, positive sequence voltage current value is obtained by transformation matrix, again by uniform transmission line rood to positive sequence wave impedance and unit length positive sequence impedance value, then by fault point voltage row quadratic equation with one unknown, thus fault distance is drawn.

3. the Two-terminal Fault Location system of a kind of fault recorder data based on scheduling electrical network according to claim 1, it is characterized in that, described database module is also connected with waveform display module, for described waveform display module provides the Wave data needed for display.