Waveform monitoring method and system for power transmission, transformation and distribution monitoring control equipment

Abstract

The invention discloses a waveform monitoring method for power transmission, transformation and distribution monitoring control equipment. The waveform monitoring method comprises the steps that S1, an upper computer generates a data message according to waveform information input by a user; s2, the upper computer sends the data message to a power distribution terminal; s3, the power distribution terminal analyzes the data message to obtain the waveform information; s4, the power distribution terminal performs real-time sampling according to the waveform information to obtain sampling data; s5, the power distribution terminal transmits the sampling data to the upper computer, and then the step S3 and the step S4 are repeated; and S6, when the power distribution terminal repeats the steps S3 and S4, the upper computer analyzes the sampling data and identifies abnormal points. The upper computer is used for analyzing and processing the waveform, normal work of the power distribution terminal is not affected, meanwhile, the configuration requirement for the power distribution terminal is remarkably reduced, and the cost of the power distribution terminal is greatly saved.

Description

Technical Field

[0001] The invention relates to the technical field of digital signal processing, and in particular to a waveform monitoring method for power transmission, transformation and distribution monitoring and control equipment. Background Art

[0002] The development of distribution terminals inevitably involves waveform sampling and data processing. Currently, waveform generators such as AD are mainly used to generate the required waveforms. However, since AD ​​sampling is an extremely fast and relatively random process, some instantaneous faults are difficult to reproduce during the debugging process. On the other hand, the AD data sampled during the work of the distribution terminal lacks an intuitive monitoring method, and data sampling anomalies are difficult to detect in time. Therefore, it is necessary to effectively monitor the waveform of the distribution terminal to complete the development and debugging of the distribution terminal. Summary of the invention

[0003] In view of the existing problems, the present invention provides a waveform monitoring method for power transmission, transformation and distribution monitoring and control equipment to solve the above problems.

[0004] In order to solve the above problems, the present invention provides a waveform monitoring method for a power transmission, transformation and distribution monitoring and control device, comprising:

[0005] S1, the host computer generates data messages from the waveform information input by the user;

[0006] S2, the host computer sends the data message to the power distribution terminal;

[0007] S3, the power distribution terminal parses the data message to obtain the waveform information;

[0008] S4, the power distribution terminal performs real-time sampling according to the waveform information to obtain sampling data;

[0009] S5, the power distribution terminal transmits the sampled data to the host computer, and then repeats steps S3 and S4;

[0010] S6. While the power distribution terminal repeats steps S3 and S4, the host computer analyzes the sampled data to identify abnormal points.

[0011] In a possible implementation manner, before step S2, the step further includes:

[0012] The power distribution terminal is in a blocking state when it does not receive a signal sent by the host computer. When there is a signal from the host computer, the power distribution terminal starts to receive data messages. When the signal from the host computer is interrupted, it switches to the blocking state.

[0013] In a possible implementation, step S1 includes:

[0014] The host computer generates the waveform information according to the waveform sequence or designated file input by the user.

[0015] In a possible implementation manner, the host computer analyzes the sampled data to identify abnormal points, including:

[0016] The host computer extracts waveform feature quantities from the sampled data, generates a waveform graph according to the waveform feature quantities, and compares the waveform graph with the waveform information to obtain the abnormal point.

[0017] In a possible implementation, the waveform sequence includes a sine wave, a square wave, and a triangle wave.

[0018] In a possible implementation manner, the waveform characteristic quantities include the amplitude, frequency, and phase of the DC component and each harmonic component.

[0019] In a possible implementation manner, the host computer analyzes the sampled data to identify abnormal points, including:

[0020] The sampling data is converted into a waveform image, and the waveform image is analyzed according to a preset protection logic to obtain the abnormal point.

[0021] As a second aspect of the present invention, the present invention further provides a waveform monitoring system for a power transmission, transformation and distribution monitoring and control device, comprising a host computer and a distribution terminal, wherein the host computer and the distribution terminal are used to execute the aforementioned waveform monitoring method, wherein:

[0022] The host computer is electrically connected to the power distribution terminal;

[0023] The host computer includes a waveform generation module, a waveform drawing module and a data processing module.

[0024] The waveform generating module is used to generate waveform information sent to the power distribution terminal;

[0025] The waveform drawing module is used to draw a waveform image according to the waveform feature quantity;

[0026] The data processing module is used to analyze the waveform image to obtain abnormal points;

[0027] The power distribution terminal includes a receiving module, a sampling module and a computing module.

[0028] The receiving module is used to receive the waveform information sent by the host computer;

[0029] The sampling module is used for sampling waveform data;

[0030] The operation module is used to organize the waveform data collected by the sampling module.

[0031] In a possible implementation, the host computer further includes a waveform configuration module, and the waveform configuration module is used to receive waveform parameters input by a user.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] 1. The waveform is analyzed and processed by the host computer, which does not affect the normal operation of the distribution terminal. At the same time, the configuration requirements of the distribution terminal are significantly reduced, which greatly saves the cost of the distribution terminal;

[0034] 2. The host computer is used to monitor the waveform generation and playback process, and the instantaneous AD sampling process that cannot be stably reproduced is converted into a virtual AD process that is temporarily saved and can be stably reproduced, which significantly improves the efficiency of program operation error identification and debugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a flow chart of a waveform monitoring method of a power transmission, transformation and distribution monitoring and control device according to the present invention;

[0036] Figure 2 The present invention is a schematic structural diagram of a waveform monitoring system for a power transmission, transformation and distribution monitoring and control device. DETAILED DESCRIPTION

[0037] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0038] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0039] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structures and / or functions described herein are merely illustrative. Based on this disclosure, those skilled in the art should understand that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways.

[0040] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The illustrations only show the structures related to the present disclosure rather than being drawn according to the number, shape and size of the structures in actual implementation. In actual implementation, the form, quantity and proportion of each structure may be changed arbitrarily, and its structural layout may also be more complicated.

[0041] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0042] A waveform monitoring method for a power transmission, transformation and distribution monitoring and control device according to the present invention comprises:

[0043] S1, the host computer generates data messages from the waveform information input by the user;

[0044] Among them, the data message can be generated by the waveform sequence set by the user or the specified COMTRADE file. COMTRADE is generally referred to as the common format for transient data exchange in power systems. In order to solve the problem of data exchange between digital fault recording devices, digital protection, and microcomputer test devices, IEEE proposed this standard in 1991, and revised and improved it in 1999. This standard is a public data transmission format standard followed by equipment produced by different manufacturers. Each COMTRADE record contains up to four related files. The file names of these files are the same, but the extensions are different. The four files are: 1 header file (.hdr); 2 configuration file (.cfg); 3 data file (.dat); 4 information file (.inf).

[0045] Since COMTRADE files are similar to structured data, the configuration file can be extracted from the extension, and then the waveform-related data can be extracted from the configuration file. Finally, the waveform data can be sorted to generate the required data message.

[0046] The waveform sequence is generated by the mathematical formula of the waveform, which means that the whole process is a deterministic and stable process. The waveforms in the waveform sequence include sine waves, square waves, triangle waves, etc. These waveforms commonly used in distribution terminals can be randomly arranged to generate the waveform sequence, or the position of each waveform in the waveform sequence can be manually set according to the needs.

[0047] S2, the host computer sends the data message to the power distribution terminal;

[0048] The host computer and the power distribution terminal can be connected by wired connection such as optical fiber connection, or by wireless connection such as WIFI, 4G, 5G, etc.

[0049] S3, the power distribution terminal parses the data message to obtain the waveform information;

[0050] Specifically, after receiving the data message transmitted by the host computer, the distribution terminal extracts the waveform feature in the data message, which includes the amplitude, frequency, phase, etc. of the DC component and each harmonic component. Taking a sine wave as an example, the amplitude is half the distance from the peak to the trough, the phase can be represented by an angle θ between 0 and 2π, and the frequency is 1 / T.

[0051] S4, the power distribution terminal performs real-time sampling according to the waveform information to obtain sampling data;

[0052] S5, the power distribution terminal transmits the sampled data to the host computer, and then repeats steps S3 and S4;

[0053] S6. While the power distribution terminal repeats steps S3 and S4, the host computer analyzes the sampled data to identify abnormal points.

[0054] In the present invention, after a cycle of sampling is completed, the distribution terminal forwards the sampled data to the host computer through the network. Subsequently, the distribution terminal performs the subsequent functional logic normally; the host computer can analyze and calculate the received data in real time, including the DC component of the channel waveform, the amplitude, frequency, phase and other parameters of each harmonic component, and draw a graph of the sampled data waveform. At the same time, the host computer software can temporarily store the data received for a certain period of time, and support exporting the data to a file for storage, so as to facilitate reading and waveform playback testing.

[0055] That is, the host computer and the power distribution terminal work in an asynchronous manner in the present invention, making full use of the host computer's strong ability to analyze and process data. Without affecting the normal operation of the power distribution terminal, the host computer analyzes the sampled data of each cycle at any time. And because the collected waveform data is stored in the host computer, the memory requirement for the power distribution terminal will also be reduced accordingly, greatly reducing the cost of use.

[0056] In one embodiment, before step S2, the method further includes:

[0057] The power distribution terminal is in a blocking state when it does not receive a signal sent by the host computer. When there is a signal from the host computer, the power distribution terminal starts to receive data messages. When the signal from the host computer is interrupted, it switches to the blocking state.

[0058] When the distribution terminal does not receive data, its operating state will remain in the blocked state. This ensures that even if the terminal is in the debugging or testing state, no important sampling data will be missed due to data delay or loss; in each operating cycle, the data received by the distribution terminal will be completely consistent with the data sampled in the actual operating state. Therefore, it ensures that the fault scenario can be stably reproduced during the debugging process, allowing technicians to accurately analyze and locate the problem without distorting the debugging results due to data differences.

[0059] In the present invention, the identification of outliers can be performed in the following manner:

[0060] The host computer extracts waveform features from the sampled data, generates a waveform graph based on the waveform features, compares the waveform graph with the waveform information, and obtains the abnormal point. When performing graph comparison, the peak value and valley value positions can be compared.

[0061] The comparison can also be performed by image analysis, specifically, converting the sampled data into a waveform image, parsing the waveform image according to a preset protection logic, and obtaining the abnormal point. In this method, an image comparison algorithm such as pixel comparison, histogram comparison, and hash algorithm can be used for analysis.

[0062] As a second aspect of the present invention, the present invention further provides a waveform monitoring system for a power transmission, transformation and distribution monitoring and control device, comprising a host computer and a distribution terminal, wherein the host computer and the distribution terminal are used to execute the aforementioned waveform monitoring method, wherein:

[0063] The host computer is electrically connected to the power distribution terminal;

[0064] The host computer includes a waveform generation module, a waveform drawing module and a data processing module.

[0065] The waveform generating module is used to generate waveform information sent to the power distribution terminal;

[0066] The waveform drawing module is used to draw a waveform image according to the waveform feature quantity;

[0067] The data processing module is used to analyze the waveform image to obtain abnormal points;

[0068] The power distribution terminal includes a receiving module, a sampling module and a computing module.

[0069] The receiving module is used to receive the waveform information sent by the host computer;

[0070] The sampling module is used for sampling waveform data;

[0071] The operation module is used to organize the waveform data collected by the sampling module.

[0072] In a possible implementation, the host computer further includes a waveform configuration module, and the waveform configuration module is used to receive waveform parameters input by a user.

[0073] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0074] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A waveform monitoring method for power transmission, transformation and distribution monitoring and control equipment, characterized in that: include S1, the host computer generates data messages from the waveform information input by the user; S2, the host computer sends the data message to the power distribution terminal; S3, the power distribution terminal parses the data message to obtain the waveform information; S4, the power distribution terminal performs real-time sampling according to the waveform information to obtain sampling data; S5, the power distribution terminal transmits the sampled data to the host computer, and then repeats steps S3 and S4; S6. While the power distribution terminal repeats steps S3 and S4, the host computer analyzes the sampled data to identify abnormal points.

2. A waveform monitoring method for power transmission, transformation and distribution monitoring and control equipment according to claim 1, characterized in that: Before step S2, the following steps are also included: The power distribution terminal is in a blocking state when it does not receive a signal sent by the host computer. When there is a signal from the host computer, the power distribution terminal starts to receive data messages. When the signal from the host computer is interrupted, it switches to the blocking state.

3. The waveform monitoring method of a power transmission, transformation and distribution monitoring and control device according to claim 1 is characterized in that: The step S1 comprises: The host computer generates the waveform information according to the waveform sequence or designated file input by the user.

4. According to the waveform monitoring method of the power transmission, transformation and distribution monitoring and control equipment of claim 1, the host computer analyzes the sampled data and identifies abnormal points, including: The host computer extracts waveform feature quantities from the sampled data, generates a waveform graph according to the waveform feature quantities, and compares the waveform graph with the waveform information to obtain the abnormal point.

5. The waveform monitoring method of a power transmission, transformation and distribution monitoring and control device according to claim 3 is characterized in that: The waveform sequence includes a sine wave, a square wave and a triangle wave.

6. A waveform monitoring method for power transmission, transformation and distribution monitoring and control equipment according to claim 4, characterized in that: The waveform characteristics include the amplitude, frequency, and phase of the DC component and each harmonic component.

7. The waveform monitoring method of a power transmission, transformation and distribution monitoring and control device according to claim 1, characterized in that: The host computer analyzes the sampled data and identifies abnormal points, including: The sampling data is converted into a waveform image, and the waveform image is analyzed according to a preset protection logic to obtain the abnormal point.

8. A waveform monitoring system for a power transmission, transformation and distribution monitoring and control device, comprising a host computer and a distribution terminal, wherein the host computer and the distribution terminal are used to execute the waveform monitoring method according to any one of claims 1 to 7, wherein: The host computer is electrically connected to the power distribution terminal; The host computer includes a waveform generation module, a waveform drawing module and a data processing module. The waveform generating module is used to generate waveform information sent to the power distribution terminal; The waveform drawing module is used to draw a waveform image according to the waveform feature quantity; The data processing module is used to analyze the waveform image to obtain abnormal points; The power distribution terminal includes a receiving module, a sampling module and a computing module. The receiving module is used to receive the waveform information sent by the host computer; The sampling module is used for sampling waveform data; The operation module is used to organize the waveform data collected by the sampling module.

9. A waveform monitoring system for power transmission, transformation and distribution monitoring and control equipment according to claim 8, characterized in that: The host computer further includes a waveform configuration module, and the waveform configuration module is used to receive waveform parameters input by a user.

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