Power signal transmission system and method

Abstract

The invention discloses a power signal transmission system and method. The power signal transmission system comprises a signal source, a signal expansion board and a signal management board, the signal expansion board is respectively connected with the signal source and the signal management board; the signal source is used for acquiring various types of signal data related to electric power and sending the acquired signal data to the signal expansion board; the signal expansion board is used for verifying the received signal data and packaging the verified data to form a message in a set format; then the formed message in the set format is sent to a signal management board; and the signal management board is used for analyzing the message sent by the signal expansion board to obtain a message recording file and a wave recording file. And the requirement of multi-channel data acquisition of a power system can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a power signal transmission system and method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] There are many types of signals in current substations, including conventional analog signals (PT / CT), conventional switch signals (hard-open nodes), SV signals, and GOOSE signals. With the commissioning of new high-voltage and ultra-high-voltage flexible direct current transmission systems, FT3 signals and TDM signals have been widely used. Therefore, in response to market demand, it is necessary to develop signal generators and intelligent fault recording devices that support TDM signals and FT3 signals.

[0004] However, the current power system signal generator that supports TDM / FT3 signals only supports a maximum of 8 optical fibers, and 8 optical fibers can only carry a maximum of 176 analog signals. For a 550kV flexible direct current transmission system, there are hundreds of analog signals with a sampling rate of 10k. Obviously, a single signal generator cannot meet the daily testing and development needs of fault recorders. In the actual R&D and testing stage, multiple signal generators have to be used to test TDM signals and FT3 signals, but multiple testers will have problems such as asynchronous sampling points and sampling delays, which will affect the synchronization and authenticity of the sampled data. Therefore, how to enable a single power system signal generator to output more signals to meet the actual scenario requirements of the fault recorder has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes a power signal transmission system and method, which can meet the needs of multi-channel data acquisition in the power system.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In the first aspect, a power signal transmission system is proposed, comprising: a signal source, a signal expansion board and a signal management board; the signal expansion board is connected to the signal source and the signal management board respectively;

[0008] A signal source, used for acquiring various types of signal data related to power, and sending the acquired signal data to a signal expansion board;

[0009] The signal expansion board is used to verify the received signal data, encapsulate the verified data, and form a message in a predetermined format; then, the formed message in a predetermined format is sent to the signal management board;

[0010] The signal management board is used to parse the messages sent by the signal expansion board and obtain message record files and wave recording files.

[0011] Furthermore, the signal expansion board adopts FPGA, and the types of signal data sent by the signal source include TDM signal, FT3 signal, PTP1588 signal, SV signal and GOOSE signal.

[0012] Furthermore, the signal expansion board is communicatively connected to the signal management board via a PCIe bus.

[0013] Furthermore, the signal source is configured with different types of output ports and sampling rate setting ports.

[0014] Furthermore, the signal source is further used to add a check code to the acquired signal data to form signal data containing the check code; and send the check code and the signal data containing the check code to the signal expansion board;

[0015] The signal expansion board is also used to extract a check code from the received signal data; when the extracted check code is the same as the check code received from the signal source, the signal data verification is passed.

[0016] Furthermore, the signal expansion board is used to preprocess the received signal data to obtain preprocessed data; and to encapsulate the preprocessed data; wherein the process of preprocessing the signal data includes: adding a frame header label to the signal data, adding a time stamp, and verifying whether the signal data is normal; the obtained preprocessed data is data with a frame header label and a time stamp added, and verified.

[0017] Furthermore, the signal management board is also used to determine the channel value of the received message when parsing the received message; based on the counter parameters in the channel value, it is judged whether the message is abnormal, and when the message is judged to be abnormal, an alarm message is issued.

[0018] Furthermore, the process of the signal management board parsing the message includes:

[0019] Determine whether the length of the received message meets the expected length;

[0020] For a message that meets the expected length, the message type is determined; and the message is parsed according to the message type.

[0021] In a second aspect, a signal transmission method of a power signal transmission system proposed in the first aspect is proposed, comprising:

[0022] Acquire power-related signal data through a signal source; and send the signal data to a signal expansion board;

[0023] The signal expansion board verifies the received signal data, encapsulates the verified data, and forms a message in a predetermined format; then, the formed message in a predetermined format is sent to the signal management board;

[0024] The signal management board parses the message sent by the signal expansion board to obtain the message record file and the wave recording file.

[0025] Furthermore, the signal source adds a check code to the received signal data to form signal data containing the check code; and sends the check code and the signal data containing the check code to the signal expansion board;

[0026] The signal expansion board extracts the check code from the received signal data; when the extracted check code is the same as the check code received from the signal source, the signal data verification is passed;

[0027] The signal management board determines whether the length of the received message meets the expected length;

[0028] For a message that meets the expected length, the message type is determined; and the message is parsed according to the message type.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention discloses an electric power signal transmission system and method. The signal source in the system can be connected to multiple signal lines of different types, which greatly improves the number of electrical quantity channels and can meet the needs of multi-channel data acquisition in the electric power system. In addition, a signal expansion board is also provided in the system. The signal expansion board is used to verify the signal data sent by the signal source. Only the signal data that passes the verification will be subsequently packaged and analyzed, thereby ensuring the accuracy of the subsequent analysis results.

[0031] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0033] Figure 1 The present invention is a structural block diagram of a power signal transmission system disclosed in an embodiment. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0037] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0038] Example 1

[0039] In order to output more signals to meet the actual scenario requirements of the fault recorder, in this embodiment, a power signal transmission system is disclosed, including: a signal source, a signal expansion board and a signal management board; the signal expansion board is connected to the signal source and the signal management board respectively;

[0040] A signal source, used for acquiring various types of signal data related to power, and sending the acquired signal data to a signal expansion board;

[0041] The signal expansion board is used to verify the received signal data, encapsulate the verified data, and form a message in a predetermined format; then, the formed message in a predetermined format is sent to the signal management board;

[0042] The signal management board is used to parse the messages sent by the signal expansion board and obtain message record files and wave recording files.

[0043] Among them, the signal expansion board adopts FPGA, and the types of signal data sent by the signal source include TDM signal, FT3 signal, PTP1588 signal, SV signal and GOOSE signal.

[0044] This embodiment utilizes the multi-soft core and high concurrency characteristics of FPGA, and can connect up to 36 optical fibers. Based on the calculation that each optical fiber carries 22 electrical quantities, it can support 792 analog quantities. Compared with the current situation that traditional digital signal protection instruments can only connect up to 8 fibers, the number of electrical quantity channels has been greatly increased to meet the needs of complex on-site application scenarios.

[0045] The signal source disclosed in this embodiment is configured with different types of output ports and sampling rate setting ports. Through different types of output ports, it can output SV signals, GOOSE signals, PTP1588 signals, TDM signals or FT3 signals, etc.; through the sampling rate setting port, different sampling rates can be set according to on-site detection requirements, such as 10k, 20k, 50k or 100k.

[0046] In order to ensure the accuracy of subsequent analysis of the signal data, the signal source of this embodiment is also used to add a check code Checksum1 to the acquired signal data to form signal data containing the check code; the check code Checksum1 and the signal data containing the check code are sent to the signal expansion board;

[0047] The signal expansion board is also used to extract the check code Checksum2 from the signal data containing the check code; when the extracted check code Checksum2 is the same as the check code Checksum1 received from the signal source, the signal data verification is passed, indicating that the currently received signal data is normal, and then the verified signal data is encapsulated; and when the extracted check code Checksum2 is not equal to the check code Checksum1 received from the signal source, it indicates that the currently received signal data is abnormal, and then the abnormal signal data is discarded and no further processing is performed, so as to ensure the accuracy of the subsequent analysis signal.

[0048] In a specific implementation, the signal expansion board is used to preprocess the received signal data to obtain preprocessed data; and to encapsulate the preprocessed data; wherein the process of preprocessing the signal data includes: adding a frame header label to the signal data, adding a time stamp, and verifying whether the signal data is normal; the obtained preprocessed data is data with a frame header label and a time stamp added, and verified.

[0049] The frame header label includes the logical port number, message length and networking number.

[0050] This embodiment uses a CRC check method to verify whether the signal data is normal.

[0051] The signal expansion board of this embodiment is communicatively connected to the signal management board via a PCIe bus.

[0052] The signal management board of this embodiment is also used to determine the channel value of the received message when parsing the received message; based on the counter parameter Smpcnt in the channel value, it is judged whether the message is abnormal, and when the message is judged to be abnormal, an alarm message is issued.

[0053] Specifically, the signal management board determines whether the message has abnormal events such as message communication interruption, message timeout, message frame loss, message misorder or message duplication based on the Smpcnt of the two received messages; and issues corresponding alarm information according to different abnormal events.

[0054] The process of parsing the message by the signal management board in this embodiment includes:

[0055] Determine whether the length of the received message meets the expected length;

[0056] For a message that meets the expected length, the message type is determined; and the message is parsed according to the message type.

[0057] The types of messages include: SV message, GOOSE message, PTP1588 message, TDM message and FT3 message.

[0058] The signal management board directly discards the messages that do not meet the expected length and no longer performs subsequent processing; the signal management board also parses the logical port number, networking number and MAC address of the messages that meet the expected length. The parsed logical port number and networking number of the message are used for subsequent traffic statistics analysis; the parsed MAC address is used for message classification to determine whether the message belongs to unicast, multicast or broadcast.

[0059] In a specific implementation, the TDM signal data output by the signal source includes three types of signal data, which are transmitted to the signal expansion board through three optical fibers.

[0060] TDM signal data includes three types of signal data, namely:

[0061] CLK:Clock signal in TDM, time division multiplexing clock signal;

[0062] FS:Frame sync signal in TDM, frame synchronization signal;

[0063] TDM: Time division multiplexing (data), time division multiplexing signal, that is, the specific signal collected.

[0064] The specific frame format of TDM signal data is shown in Table 1.

[0065] Table 1

[0066]

[0067]

[0068] After the signal management board receives the TDM signal from the signal source, it parses it according to the four-byte floating point number and displays the real-time waveform on the corresponding analog channel.

[0069] TDM signal verification algorithm:

[0070] 1.a=starting 32-bit bytes

[0071] 2. b = a + 1

[0072] 3.c = 32-bit bytes in the second slot

[0073] 4.d=c+2

[0074] 5. e = b + d

[0075] 6.x=e+12345678 (fixed plus a hexadecimal number)

[0076] 7.x = calculated checksum that is sent as verification

[0077] The signal expansion board processes the FT3 signal data with different sampling rates sent by the signal source as follows:

[0078] R1, R2, R3, and R4 represent the processing flow of the signal expansion board for FT3 signals with different sampling rates, specifically, the transmission data frame format description of the link layer.

[0079] The R1 idle state is binary 1. This value 1 is transmitted continuously between two frames according to Manchester encoding. At least 20 idle bits should be transmitted between two frames to make it easier for the receiver's clock to synchronize.

[0080] The first two octets of the R2 frame represent the start character (0x0564).

[0081] R3 is 16 octets of user data ending with a 16-bit check sequence (CRC). The specific algorithm is:

[0082] X16+X13+X12+X11+X10+X8+X6+X5+X2+1

[0083] X16, X13, X12...X1 represent the 16th, 13th, 12th...2nd bit of a 16-bit data (2 bytes) respectively; among which, the first bit of the 16-bit data is 1, which is a detailed description of the polynomial calculation rules of the CRC16 algorithm.

[0084] R4 is the signal expansion board that checks the signal quality, start character, various check sequences and frame length.

[0085] The signal management board receives the FT3 signal with different sampling rates and performs sampling. The conventional 10k is a standard 4-block situation. The specific frame format is shown in Table 2. 50k and 100k are one-block situations. The data area in the frame structure can also be customized according to actual site needs.

[0086] Table 2

[0087]

[0088]

[0089] When the signal source sends TDM signal data and FT3 signal data at the same time, the process of processing the TDM signal data and FT3 signal data is as follows:

[0090] Some substations require simultaneous access to TDM signals and FT3 signals. In this case, the three ports of the signal expansion board are grouped together, which are recorded as clk, FS and data of the TDM signal. The remaining ports of the expansion board are used to access the FT3 signal. At this time, pay attention to the order of the three TDM signals. If any signal is out of order, the TDM signal cannot be received normally.

[0091] The present embodiment discloses a power signal transmission system, whose signal source can connect 36 optical fibers, greatly improving the signal output capacity and meeting the increasingly complex on-site requirements. The data sent by the signal source is verified and analyzed layer by layer through the signal expansion board and the signal management board, ensuring the accuracy of subsequent signal analysis; finally, for the verified message, the primary value and secondary value of the electrical quantity channel are converted according to the transformation ratio / sampling value coefficient; based on the analyzed primary and secondary values, a message record file and a steady-state or fault recording file are formed, providing a strong guarantee for the fault analysis of the substation power system.

[0092] Example 2

[0093] In this embodiment, a signal transmission method of a power signal transmission system disclosed in Embodiment 1 is disclosed, including:

[0094] Acquire power-related signal data through a signal source; and send the signal data to a signal expansion board;

[0095] The signal expansion board verifies the received signal data, encapsulates the verified data, and forms a message in a predetermined format; then, the formed message in a predetermined format is sent to the signal management board;

[0096] The signal management board parses the message sent by the signal expansion board to obtain the message record file and the wave recording file.

[0097] The signal source adds a check code to the received signal data to form signal data containing the check code; the check code and the signal data containing the check code are sent to the signal expansion board;

[0098] The signal expansion board extracts the check code from the signal data containing the check code; when the extracted check code is the same as the check code received from the signal source, the signal data verification is passed;

[0099] The signal management board determines whether the length of the received message meets the expected length;

[0100] For a message that meets the expected length, the message type is determined; and the message is parsed according to the message type.

[0101] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with this embodiment can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0102] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A power signal transmission system, characterized in that: include: A signal source, a signal expansion board and a signal management board; the signal expansion board is connected to the signal source and the signal management board respectively; A signal source, used for acquiring various types of signal data related to power, and sending the acquired signal data to a signal expansion board; The signal expansion board is used to verify the received signal data, encapsulate the verified data, and form a message in a predetermined format; then, the formed message in a predetermined format is sent to the signal management board; The signal management board is used to parse the messages sent by the signal expansion board and obtain message record files and wave recording files.

2. A power signal transmission system according to claim 1, characterized in that: The signal expansion board adopts FPGA, and the types of signal data sent by the signal source include TDM signal, FT3 signal, PTP1588 signal, SV signal and GOOSE signal.

3. A power signal transmission system according to claim 1, characterized in that: The signal expansion board is connected to the signal management board through the PCIe bus.

4. The power signal transmission system according to claim 1, characterized in that: The signal source is configured with different types of output ports and sampling rate setting ports.

5. The power signal transmission system according to claim 1, characterized in that: The signal source is further used to add a check code to the acquired signal data to form signal data containing the check code; and send the check code and the signal data containing the check code to the signal expansion board; The signal expansion board is also used to extract the check code from the signal data containing the check code; when the extracted check code is the same as the check code received from the signal source, the signal data verification is passed.

6. The power signal transmission system according to claim 1, characterized in that: A signal expansion board is used to pre-process the received signal data to obtain pre-processed data; The preprocessed data is encapsulated; wherein, the process of preprocessing the signal data includes: adding a frame header label to the signal data, adding a time stamp, and verifying whether the signal data is normal; the obtained preprocessed data is data with a frame header label and a time stamp added, and verified.

7. The power signal transmission system according to claim 1, characterized in that: The signal management board is also used to parse the received message and determine the channel value of the received message; according to the counter parameter Smpcnt in the channel value, it is judged whether the message is abnormal, and when the message is judged to be abnormal, an alarm message is issued.

8. The power signal transmission system according to claim 1, characterized in that: The process of the signal management board parsing the message includes: Determine whether the length of the received message meets the expected length; For a message that meets the expected length, the message type is determined; and the message is parsed according to the message type.

9. A signal transmission method of a power signal transmission system according to any one of claims 1 to 8, characterized in that: include: Acquire power-related signal data through a signal source; And send the signal data to the signal expansion board; The signal expansion board verifies the received signal data, encapsulates the verified data, and forms a message in a predetermined format; then, the formed message in a predetermined format is sent to the signal management board; The signal management board parses the message sent by the signal expansion board to obtain the message record file and the wave recording file.

10. A signal transmission method of a power signal transmission system according to claim 9, characterized in that: The signal source adds a check code to the received signal data to form signal data containing the check code; and sends the check code and the signal data containing the check code to the signal expansion board; The signal expansion board extracts the check code from the signal data containing the check code; when the extracted check code is the same as the check code received from the signal source, the signal data verification is passed; The signal management board determines whether the length of the received message meets the expected length; For a message that meets the expected length, the message type is determined; and the message is parsed according to the message type.

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