WO2021047342A1

WO2021047342A1 - Traveling wave ranging method and apparatus using homologous double-sampling mode, and storage medium

Info

Publication number: WO2021047342A1
Application number: PCT/CN2020/108679
Authority: WO
Inventors: 方正; 石欣; 李旭; 董新涛; 颜志刚; 张哲�; 赵剑松; 王东兴; 唐艳梅; 都磊; 王占辉; 董磊超
Original assignee: 许继集团有限公司; 许继电气股份有限公司; 许昌许继软件技术有限公司
Priority date: 2019-09-10
Filing date: 2020-08-12
Publication date: 2021-03-18
Also published as: CN110646689A

Abstract

A traveling wave ranging method and apparatus using a homologous double-sampling mode, wherein same relates to the technical field of relay protection of power systems. The traveling wave ranging method using a homologous double-sampling mode comprises respectively obtaining first sampled data and second sampled data by means of using two modes to sample homologous traveling wave data, wherein the magnification factor of the first sampled data is smaller than the magnification factor of the second sampled data, and selecting appropriate data according to the magnitude of a mutation quantity value in order to search for the header of a traveling wave; and when the mutation quantity value is large, selecting the first sampled data with the smaller magnification factor to search for the header, thereby reducing incorrect judgment of the traveling wave, and when the mutation quantity value is small, selecting the second sampled data with the larger magnification factor to search for the header, thereby reducing misjudgment of the traveling wave and improving the identification capacity and accuracy of ranging.

Description

Traveling wave ranging method, device and storage medium in homologous double sampling mode

Cross-references to related applications

This application is filed based on a Chinese patent application with an application number of 201910854465.6 and an application date of September 10, 2019, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated into this application by reference.

Technical field

This application relates to the technical field of power system relay protection, in particular to a traveling wave ranging method, device and storage medium in a homogenous double sampling mode.

Background technique

Traveling wave is an electromagnetic wave generated after the power system fails. It travels along the line at the speed of light in the form of a wave. Traveling waves are generated when faults occur, so they are also called fault traveling waves. They have the characteristics of fast abrupt change, high frequency, fast propagation speed, fast attenuation, and short duration. Although the traveling wave is a short-term sudden change signal, it contains a wealth of fault information, which can be used to realize fault judgment and fault location. For slow-climbing resistance faults with inconspicuous fault characteristics, if you directly sample and analyze the fault characteristics, you may not be able to accurately obtain the fault characteristics, resulting in missed judgments by the distance measuring device. If you sample and analyze after amplification, the noise in the acquisition loop will also be amplified. , Some signals with similar fault characteristics may appear, causing misjudgment of the ranging device, making the ranging device's ability to recognize wave heads poorer and less accurate.

Summary of the invention

The purpose of this application is to provide a traveling wave ranging method, device and storage medium in a homologous double sampling mode to solve the problem that the existing ranging technology cannot balance the missed judgment rate and the misjudgment rate, which leads to poor wave head recognition ability. problem.

In order to achieve the above objective, this application provides a traveling wave ranging method in a homologous double sampling mode, which includes the following steps:

1) Collect homologous traveling wave data through two collection circuits, get the first sample data through the first collection circuit, and get the second sample data through the second collection circuit; the magnification of the second sample data is greater than the first sample data Magnification

2) Calculate the sudden change value of the data according to the first sampled data, and judge whether the sudden change value is greater than the sudden change threshold;

3) If the sudden change value is greater than the sudden change threshold, the traveling wave head search is performed according to the first sampled data, and the fault location or distance is output; if the sudden change value is less than the sudden change threshold, the traveling wave head search is performed according to the second sampling data. And output the fault location or fault distance.

The beneficial effect is that the first sampling data and the second sampling data are obtained by sampling the same traveling wave data in two ways, wherein the magnification of the first sampling data is smaller than the magnification of the second sampling data, and according to the amount of mutation Select the appropriate data for the search of the traveling wave wave head; when the value of the sudden change is large, select the first sampling data with a smaller magnification to search the wave head, which reduces the misjudgment of the traveling wave, and selects when the value of the sudden change is small The second sampled data with a larger magnification is searched for the wave head, which reduces the missed judgment of the traveling wave and improves the recognition ability and accuracy of the distance measurement.

In some optional embodiments, in order to improve the accuracy of review and recording, the traveling wave ranging method further includes the steps of recording and displaying the wave according to the first sampled data.

In some optional embodiments, in order to obtain better sampling accuracy, the magnification factor of the first sampled data is 1.

In some optional embodiments, in order to start the wave head search step more accurately, the first sampling data is also snapshotted in step 1), and when the snapshot meets the starting condition, step 2) is executed.

The present application provides a traveling wave distance measuring device in a homologous double sampling mode, which includes a controller and a data source for acquiring traveling wave data; the controller is connected to the data source through a first acquisition circuit to obtain the first sampling data; control The device is connected to the data source through the second acquisition circuit to obtain the second sampling data; the magnification of the second sampling data is greater than the magnification of the first sampling data; the controller calculates the mutation value of the data according to the first sampling data, when When it is determined that the sudden change value is greater than the sudden change threshold, the traveling wave head search is performed according to the first sampled data, and the fault location or distance is output. When the sudden change value is less than the sudden change threshold, the traveling wave head search is performed according to the second sampling data and output Fault location or fault distance.

In some optional embodiments, in order to improve the accuracy of recording, a wave recording device is further included, and the output end of the controller is connected to the wave recording device to perform wave recording according to the first sampled data.

In some optional embodiments, in order to facilitate the reference and improve the accuracy of the reference, a display device is further included, and the output terminal of the controller is connected to the display device, and displays according to the first sampled data.

In some optional embodiments, in order to obtain better sampling accuracy, the first acquisition circuit is directly connected to the data source, and the second acquisition circuit is connected to the data source through an operational amplifier circuit.

The embodiment of the present application also provides a traveling wave ranging device in a homologous double sampling mode, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor. The computer program realizes the traveling wave ranging method of the same homology double sampling mode.

The embodiment of the present application also provides a storage medium storing an executable program, and when the executable program is executed by a processor, it realizes the traveling wave ranging method in the same homology double sampling manner.

Description of the drawings

Fig. 1 is a flow chart of a traveling wave ranging method in a homologous double sampling mode according to the present application;

Fig. 2 is a schematic diagram of a traveling wave ranging device in a homologous double sampling mode according to the present application;

FIG. 3 is a schematic diagram of the hardware composition structure of a traveling wave ranging device in a homologous double sampling mode of the present application.

detailed description

The application will be further described in detail below in conjunction with the drawings.

Method embodiment:

This application provides a traveling wave ranging method in a homologous double sampling mode, as shown in FIG. 1, including the following steps:

1) Collect homologous traveling wave data through two acquisition circuits.

The first acquisition circuit is directly connected to the data source of the traveling wave data to obtain the first sampled data, that is, the sampled data that has not been amplified; the second acquisition circuit is connected to the above-mentioned data source through an operational amplifier circuit to obtain the second sampled data, that is, the amplified Sampled data.

In this embodiment, the first acquisition circuit is directly connected to the data source of the traveling wave data. As other implementation manners, the first acquisition circuit can also be connected to the data source through an operational amplifier circuit, but its operational amplifier circuit has a smaller amplification factor than the second acquisition circuit The magnification of the operational amplifier circuit.

2) Snapshot judgment on the first sampled data.

Snap the first sampled data, and judge from the data of the snapshot whether the amplitude of more than half of the points exceeds the set amplitude, if the amplitude of more than half of the points exceeds the set amplitude, start the traveling wave Ranging, that is, continue to perform the following steps; in this embodiment, the amplitude of more than half of the points exceeds the set amplitude as the starting condition. As other implementations, other existing conditions can also be used as the starting condition, or The step of sampling judgment is omitted.

3) Calculate the mutation amount value of the data according to the first sampled data, and determine whether the mutation amount value Q is greater than the mutation amount threshold Mest.

According to the existing technology, the sudden change value of the traveling wave data is calculated. If the sudden change value Q is greater than the sudden change threshold Mest, the traveling wave wave head search is performed according to the first sampled data, and the fault location is output. When the value of the sudden change is large, it indicates that the characteristics of the data are more obvious. The first sampled data that is not amplified is selected to search the wave head to avoid the signal with similar fault characteristics caused by the amplification of noise and form a misjudgment.

If the mutation value Q is less than the mutation threshold Mest, the traveling wave head search is performed according to the second sampling data, and the fault location is output. When the value of the sudden change is small, it indicates that the characteristics of the data are not obvious, and the amplified second sampling data is selected to search the wave head to avoid the lack of identification of the characteristics and the formation of missed judgments.

Regardless of whether the mutation amount value is greater than the mutation amount threshold or the mutation amount value is less than the mutation amount threshold, the first sampling data is used for recording and display to meet the requirements of the sampling accuracy of the AC head.

In this embodiment, the fault location is output after the traveling wave head search is performed. As another implementation manner, the fault distance may also be obtained after the traveling wave wave head search is performed, and the fault distance is output.

Step 2) in this embodiment is the determination to start the wave head search. As another implementation manner, the judgment condition may not be set, and the wave head search is started in real time.

Device embodiment:

The present application provides a traveling wave ranging device in a homologous double sampling mode, as shown in FIG. 2, including a controller and an AC CT, where the AC CT is used to obtain traveling wave data; the controller is directly connected through the first acquisition circuit AC CT obtains the first sampling data; the controller connects the AC CT through the second acquisition circuit and the operational amplifier circuit to obtain the second sampling data; the controller calculates the mutation value of the data according to the first sampling data, and when the mutation amount is determined When the value is greater than the sudden change threshold, the traveling wave head is searched according to the first sampling data and the fault location is output. When the sudden change value is less than the sudden change threshold, the traveling wave head is searched according to the second sampling data and the fault location is output.

In this embodiment, the AC CT is used to obtain the traveling wave data. As another implementation manner, the traveling wave data can also be obtained through other existing secondary devices such as PT.

The traveling wave distance measuring device also includes a wave recording device and a display device. The output end of the controller is connected with the wave recording device and the display device, and performs wave recording and display according to the first sampling data to meet the requirements of the sampling accuracy of the AC head.

An embodiment of the present application also provides a traveling wave ranging device in a homologous double sampling mode, including a processor and a memory for storing a computer program that can run on the processor, wherein the processor is used to run the computer During the program, the steps of the traveling wave ranging method in the same homology double sampling mode are executed.

FIG. 3 is a schematic diagram of the hardware composition structure of the traveling wave ranging device in the homologous double sampling mode according to an embodiment of the present application. The traveling wave ranging device 700 in the homologous double sampling mode includes: at least one processor 701, a memory 702, and at least one Network interface 703. The components of the traveling wave distance measuring device 700 in the homologous double sampling mode are coupled together through the bus system 704. It can be understood that the bus system 704 is used to implement connection and communication between these components. In addition to the data bus, the bus system 704 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clear description, various buses are marked as the bus system 704 in FIG. 3.

It can be understood that the memory 702 may be a volatile memory or a non-volatile memory, and may also include both volatile and non-volatile memory. Among them, the non-volatile memory can be ROM, Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), and electrically erasable Programmable read-only memory (EEPROM, Electrically Erasable Programmable Read-Only Memory), magnetic random access memory (FRAM, ferromagnetic random access memory), flash memory (Flash Memory), magnetic surface memory, optical disk, or CD-ROM -ROM, Compact Disc Read-Only Memory); Magnetic surface memory can be disk storage or tape storage. The volatile memory may be a random access memory (RAM, Random Access Memory), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (SRAM, Static Random Access Memory), synchronous static random access memory (SSRAM, Synchronous Static Random Access Memory), and dynamic random access memory. Memory (DRAM, Dynamic Random Access Memory), Synchronous Dynamic Random Access Memory (SDRAM, Synchronous Dynamic Random Access Memory), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM, Double Data Rate Synchronous Dynamic Random Access Memory), enhanced Type synchronous dynamic random access memory (ESDRAM, Enhanced Synchronous Dynamic Random Access Memory), synchronous connection dynamic random access memory (SLDRAM, SyncLink Dynamic Random Access Memory), direct memory bus random access memory (DRRAM, Direct Rambus Random Access Memory) ). The memory 702 described in the embodiment of the present application is intended to include, but is not limited to, these and any other suitable types of memory.

The memory 702 in the embodiment of the present application is used to store various types of data to support the operation of the traveling wave ranging apparatus 700 in the same-source double sampling mode. Examples of these data include: any computer program, such as application program 7022, used to operate on the traveling wave distance measuring device 700 in the homologous double sampling mode. A program that implements the method of the embodiment of the present application may be included in the application program 7022.

The method disclosed in the foregoing embodiments of the present application may be applied to the processor 701 or implemented by the processor 701. The processor 701 may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the foregoing method can be completed by an integrated logic circuit of hardware in the processor 701 or instructions in the form of software. The aforementioned processor 701 may be a general-purpose processor, a digital signal processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and the like. The processor 701 may implement or execute the methods, steps, and logical block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium, and the storage medium is located in the memory 702. The processor 701 reads the information in the memory 702 and completes the steps of the foregoing method in combination with its hardware.

In an exemplary embodiment, the traveling wave ranging 700 in a homologous double sampling manner can be implemented by one or more application specific integrated circuits (ASIC, Application Specific Integrated Circuit), DSP, and Programmable Logic Device (PLD, Programmable Logic Device). , Complex Programmable Logic Device (CPLD, Complex Programmable Logic Device), FPGA, general-purpose processor, controller, MCU, MPU, or other electronic components to implement the foregoing methods.

The embodiment of the present application also provides a storage medium for storing a computer program. The computer program enables the computer to execute the corresponding process in the traveling wave ranging method of the same source double sampling mode in the embodiment of the present application. For the sake of brevity, it is not here. Go into details again.

The specific implementation manners involved in the application are given above, but the application is not limited to the described implementation manners. Under the ideas given in this application, the technical means in the above-mentioned embodiments are changed, replaced, and modified in ways that are easily conceivable to those skilled in the art, and the functions are basically the same as the corresponding technical means in this application. The objectives of the invention achieved are basically the same. The technical solution formed in this way is formed by fine-tuning the above-mentioned embodiments, and this technical solution still falls within the protection scope of the present application.

Claims

A traveling wave ranging method with homologous double sampling mode, including the following steps:

Collect homologous traveling wave data through two collection circuits, get the first sample data through the first collection circuit, and get the second sample data through the second collection circuit; the magnification of the second sampling data is greater than the magnification of the first sampling data multiple;

Calculate the mutation amount value of the data according to the first sampled data, and determine whether the mutation amount value is greater than the mutation amount threshold;

If the sudden change value is greater than the sudden change threshold, the traveling wave head search is performed according to the first sampled data, and the fault location or distance is output; if the sudden change value is less than the sudden change threshold, the traveling wave head search is performed according to the second sampling data and output Fault location or fault distance.
The traveling wave ranging method of homologous double sampling mode according to claim 1, wherein the traveling wave ranging method further comprises:

According to the first sampling data, the steps of recording and displaying are performed.
The traveling wave ranging method of homologous double sampling mode according to claim 1 or 2, wherein:

The magnification factor of the first sampled data is 1.
The traveling wave ranging method of homologous double sampling mode according to claim 1 or 2, wherein, before calculating the mutation value of the data according to the first sampling data, the method further comprises: performing the first sampling data Sampling point, when the sampling point meets the starting condition, the sudden change value of the data is calculated according to the first sampled data.
A traveling wave distance measuring device in a homologous double sampling mode, which includes a controller and a data source for obtaining traveling wave data; the controller is connected to the data source through a first acquisition circuit to obtain the first sampling data; the controller The second sampling data is connected to the data source through the second acquisition circuit to obtain the second sampling data; the magnification of the second sampling data is greater than the magnification of the first sampling data; the controller calculates the mutation value of the data according to the first sampling data, and when it is determined When the sudden change value is greater than the sudden change threshold, the traveling wave head is searched according to the first sampled data, and the fault location or distance is output. When the sudden change value is less than the sudden change threshold, the traveling wave head is searched according to the second sampling data and the fault is output. Location or distance to failure.
The traveling wave distance measuring device in the same-source double sampling mode according to claim 5, wherein the device further comprises: a wave recording device, the output terminal of the controller is connected to the wave recording device, according to the first Sampling data is recorded.
The traveling wave distance measuring device of homologous double sampling mode according to claim 5 or 6, wherein the device further comprises a display device, and the output terminal of the controller is connected to the display device, and according to the first sampling The data is displayed.
The traveling wave distance measuring device in a homologous double sampling mode according to claim 5, wherein:

The first acquisition circuit is directly connected to the data source, and the second acquisition circuit is connected to the data source through an operational amplifier circuit.
A traveling wave distance measuring device in a homologous double sampling mode, comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor. The processor implements the following when the computer program is executed. The traveling wave ranging method of homologous double sampling mode according to any one of claims 1 to 4.
A storage medium storing an executable program, and when the executable program is executed by a processor, it realizes the traveling wave distance measurement method in a homologous double sampling manner according to any one of claims 1 to 4.