Broadband harmonic and inter-harmonic data communication optimization method and system

Abstract

The invention discloses a broadband harmonic and inter-harmonic data communication optimization method and a broadband harmonic and inter-harmonic data communication optimization system, which are applied to the field of communication between a broadband measurement main station and a broadband measurement sub-station. According to the method, a harmonic message transmission format and an inter-harmonic message transmission format are added on the basis of a real-time transmission data message format of a communication protocol GB / T 26865.2; the harmonic and inter-harmonic data streams are controlled through command connection and data connection; the related oscillation constant value field is added in the configuration frame, so that the control capability of the master station to the substation is improved, and the accuracy of judging and monitoring the oscillation of the substation is improved.

Description

Technical Field

[0001] This invention relates to the field of substation data transmission technology, specifically to a method and system for optimizing broadband harmonic and interharmonic data communication. Background Technology

[0002] Wideband measurement devices play a crucial role in the dynamic and refined monitoring and analysis of signals in substations. Their core function is to measure and record signals across the entire power grid frequency band and upload this data to the dispatch master station. The dispatch master station, acting as a data aggregation and analysis center, receives and integrates raw data from multiple wideband measurement devices, ensuring real-time monitoring and power grid safety. Unlike PMU devices, wideband measurement devices extend their frequency range from power frequency (50Hz) to 0-2500Hz, supporting comprehensive analysis of harmonics, interharmonics, and wideband oscillations. Based on existing communication protocols, the amount of real-time data transmitted from wideband measurement devices to the master station is approximately three times that of PMUs. Furthermore, each wideband measurement substation typically connects to multiple master stations, placing significant pressure on the substation's bandwidth and frequently resulting in insufficient bandwidth in the field. Expanding the substation's bandwidth is not only time-consuming and labor-intensive but also incurs high costs and downtime losses. Current broadband measurement data communication protocols transmit fundamental, harmonic, and interharmonic data in the same frame, typically at a transmission rate of 50 frames per second. This results in 50 frames of harmonic data and 50 frames of interharmonic data being transmitted per second (50 frames make up 1 second of data). The harmonic and interharmonic data are updated every second, which is unnecessary for frequencies other than the maximum amplitude, thus wasting significant bandwidth. Furthermore, because the oscillation setpoint was not previously clearly defined, many substations set their oscillation setpoints based on experience, often setting them too low, leading to false oscillation alarms at many substations. With increasingly stringent provincial dispatching regulations on oscillation, the control of substation oscillation setpoints needs to be strengthened.

[0003] Therefore, optimizing harmonic and interharmonic data, saving data communication traffic, and monitoring and managing oscillation setpoints are urgent problems that need to be solved. Summary of the Invention

[0004] This invention proposes a broadband harmonic and interharmonic data communication optimization method and system. By extending the GB / T26865.2 protocol, it adds independent configuration frames, data frames, and command frames for harmonics and interharmonics. Based on this, it optimizes the update strategy for harmonic and interharmonic data, significantly saving data communication traffic. At the same time, to facilitate the master station to issue setpoints, it adds over-limit values ​​such as low-frequency oscillation, sub / supersynchronous oscillation, and broadband oscillation to the harmonic and interharmonic configuration frames, effectively improving the master station's control capability over the substations and improving the accuracy of substation oscillation detection and monitoring, thereby ensuring the safe operation of the power grid.

[0005] This invention is achieved using the following technical solution: A method for optimizing broadband harmonic and interharmonic data communication includes: Based on the PMU communication protocol, the configuration frame CFG-1H, configuration frame CFG-2H, data frame DATA-H, and command frame CMD-H for harmonics and interharmonics are defined. When data communication occurs, establish command and data connections between broadband measurement master and slave stations; The master station sends the command "Upload configuration frame CFG-1H file" via command connection. The substation receives the command "Upload configuration frame CFG-1H file", generates the CFG-1H file according to the local harmonic interharmonic configuration of the substation, and sends it to the master station. After receiving the CFG-1H file, the master station sends the command "Download configuration frame CFG-2H file"; the CFG-2H file is sent only after receiving an acknowledgment reply from the substation. The substation verifies and saves the CFG-2H file, and the master station sends the "Start Real-time Data Transmission" command via command connection; After receiving the command, the substation will periodically send harmonic and interharmonic data through the data connection based on the latest received and verified CFG-2H file.

[0006] Preferably, establishing the command and data connections between the broadband measurement master and slave stations includes: The broadband measurement master station establishes command and data connections in accordance with the requirements of the communication protocol GB / T 26865.2. First, the command connection is established, which includes the transmission of header frames, configuration frames, and command frames, and is bidirectional. The data connection is used to transmit real-time data, which is unidirectional, and is established after the command connection is established.

[0007] Preferably, the configuration frame CFG-1H contains all harmonic and interharmonic measurement data that can be transmitted from the substation broadband measurement device side, as well as oscillation-related setpoints; When a substation receives the command to "upload harmonic configuration frame CFG-1H file", it will generate a CFG-1H file containing the number of phasors, the number of analog quantities, the names, the conversion factors, the low-frequency oscillation setpoints, the sub / supersynchronous oscillation setpoints, and the broadband oscillation setpoints of each of its broadband measurement devices, and send it to the master station.

[0008] Preferably, the configuration frame CFG-2H contains the harmonic and interharmonic measurement data and oscillation setpoints subscribed to by a certain client; when the master station needs to modify the oscillation setpoints of the substation, the master station modifies them and sends them to the substation through the configuration frame CFG-2H.

[0009] Preferably, the data frame DATA-H is used to transmit harmonic and interharmonic measurement data, including the amplitude and phase angle of harmonic and interharmonic phasors, as well as analog data.

[0010] Preferably, the transmission order of the harmonic data in the data frame DATA-H is as follows: The phasor and frequency of the harmonic with the largest amplitude are sent in the first frame every second, once per second; The phasor and frequency of the interharmonic with the largest amplitude are sent every second, once per second; Frames 5-10 transmit phasor and frequency data of the 1st to 50th harmonics and data of the 1st to 10th dominant interharmonics within 10 seconds.

[0011] Preferably, the method further includes: After receiving the CFG-2H file, the substation performs a validity check. If the check passes, it will be saved locally as a communication configuration file; otherwise, it will be discarded.

[0012] Preferably, the method further includes: The substation receives the CFG-2H file and performs a validity check, checking whether an oscillation setpoint has been issued; When no oscillation setpoint is issued, the master station sends a "start real-time data transmission" command via command connection; If an oscillation setpoint is issued, the substation data concentrator parses the corresponding field of the configuration frame CFG-2H, reads the corresponding oscillation setpoint and the broadband measurement unit whose setpoint needs to be changed, and sends it to the broadband measurement unit on the communication link in the same CFG-2H format. The broadband measurement unit parses the oscillation setpoint and modifies it. After successful modification, it returns an acknowledgment command frame to the substation data concentrator. When all broadband measurement unit setpoints have been modified, the substation data concentrator returns an acknowledgment command frame to the master station. When the master station receives the acknowledgment command frame, it determines that the modification of the substation oscillation setpoint was successful.

[0013] This invention also provides a broadband harmonic and interharmonic data communication optimization system for implementing the above-mentioned broadband harmonic and interharmonic data communication optimization method, the system comprising: The configuration module is used to define the configuration frame CFG-1H, configuration frame CFG-2H, data frame DATA-H, and command frame CMD-H for harmonics and interharmonics based on the PMU communication protocol. The communication link module is used to establish command and data connections between broadband measurement master and slave stations when data communication occurs; The master station sends the command "Upload configuration frame CFG-1H file" to the substation via command connection, and after receiving the CFG-1H file, sends the command "Download configuration frame CFG-2H file"; it sends the CFG-2H file to the substation only after receiving an acknowledgment reply from the substation; and it sends the command "Start real-time data transmission" to the substation via command connection. Upon receiving the command "Upload configuration frame CFG-1H file", the substation generates a CFG-1H file based on the local harmonic and interharmonic configuration and sends it to the master station; it also verifies and saves the CFG-2H file; and based on the latest received and verified CFG-2H file, it periodically sends harmonic and interharmonic data via the data connection.

[0014] Preferably, the substation is also used for, Upon receiving the CFG-2H file, its validity is verified, and it is checked whether an oscillation setpoint has been issued. When no oscillation setpoint is issued, the master station sends a "start real-time data transmission" command via command connection; If an oscillation setpoint is issued, the substation data concentrator parses the corresponding field of the configuration frame CFG-2H, reads the corresponding oscillation setpoint and the broadband measurement unit whose setpoint needs to be changed, and sends it to the broadband measurement unit on the communication link in the same CFG-2H format. The broadband measurement unit parses the oscillation setpoint and modifies it. After successful modification, it returns an acknowledgment command frame to the substation data concentrator. When all broadband measurement unit setpoints have been modified, the substation data concentrator returns an acknowledgment command frame to the master station. When the master station receives the acknowledgment command frame, it determines that the modification of the substation oscillation setpoint was successful.

[0015] By adopting the above technical solution, the beneficial effects achieved by the present invention are as follows: This invention proposes an optimized method for broadband harmonic and interharmonic data communication. By extending the GB / T 26865.2 specification, it adds independent configuration frames, data frames, and command frames for harmonics and interharmonics. Based on this, it optimizes the update strategy for harmonic and interharmonic data, significantly reducing data communication traffic. At the same time, to facilitate the master station in issuing setpoints, it adds over-limit value fields such as low-frequency oscillation, sub / supersynchronous oscillation, and broadband oscillation to the harmonic and interharmonic configuration frames, effectively improving the master station's control capability over the substation and enhancing the accuracy of substation oscillation detection and monitoring. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the communication process between the master station and the substation in the harmonic and interharmonic data transmission proposed in this invention; Figure 2 This is a schematic diagram of the harmonic and interharmonic data transmission method proposed in this invention; Figure 3This is a schematic diagram of the oscillation setpoint distribution process proposed in this invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this invention are used to explain the invention, but are not intended to limit the invention.

[0018] It should also be noted that, in order to avoid obscuring the invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the invention are shown in the accompanying drawings, while other details that are not closely related to the invention are omitted.

[0019] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, element, step, or component, but does not exclude the presence or addition of one or more other features, elements, steps, or components.

[0020] It should also be noted that, unless otherwise specified, the term "connection" in this article can refer not only to a direct connection, but also to an indirect connection involving an intermediary.

[0021] In the following description, embodiments of the invention will be illustrated with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar parts, or the same or similar steps.

[0022] It should be emphasized here that the step markers mentioned below are not a limitation on the order of the steps, but should be understood as meaning that the steps can be executed in the order mentioned in the embodiments, or in a different order than in the embodiments, or several steps can be executed simultaneously.

[0023] This invention proposes an optimized method for broadband harmonic and interharmonic data communication. By extending the GB / T 26865.2 specification, it adds independent configuration frames, data frames, and command frames for harmonics and interharmonics. Based on this, it optimizes the update strategy for harmonic and interharmonic data, significantly reducing data communication traffic. At the same time, to facilitate the master station in issuing setpoints, it adds over-limit value fields such as low-frequency oscillation, sub / supersynchronous oscillation, and broadband oscillation to the harmonic and interharmonic configuration frames, effectively improving the master station's control capability over the substation and enhancing the accuracy of substation oscillation detection and monitoring.

[0024] This invention provides an optimization method for broadband harmonic and interharmonic data communication. Based on the PMU communication protocol GB / T26865.2, it specifically defines independent configuration frames (CFG-1H, CFG-2H) and data frames (DATA-H) for harmonics and interharmonics, and defines related command frames (CMD-H). See also Figure 1The communication process between the broadband measurement master and slave stations is as follows: For a broadband measurement master station to establish real-time data communication with a broadband measurement substation, it must first establish command and data connections with the substation. Once the command connection is established, the master station sends a command to "upload configuration frame CFG-1H file". Upon receiving this command, the broadband measurement substation generates a CFG-1H file based on its local interharmonic configuration and sends it to the master station. The CFG-1H file describes the substation's interharmonic measurement capabilities. After receiving the substation's CFG-1H file, the master station sends a command to "download configuration frame CFG-2H". The master station will only send the CFG-2H file after receiving confirmation from the substation. The substation must verify the CFG-2H file received from the master station. If the verification passes, it is saved locally as a communication configuration file; otherwise, it is discarded.

[0025] In this invention, the broadband measurement master station establishes command and data connections according to the requirements of the communication protocol GB / T 26865.2. The command connection is established first, primarily transmitting header frames, configuration frames, and command frames; this transmission is bidirectional. The data connection primarily transmits real-time data; this transmission is unidirectional and is established after the command connection is established.

[0026] In this invention, the configuration frame CFG-1H for harmonics and interharmonics is similar to that for the fundamental frequency configuration frame, covering all harmonic and interharmonic measurement data and oscillation-related setpoints that can be transmitted from the substation device side. When the substation receives the command to "upload configuration frame CFG-1H file", it will generate a CFG-1H file by configuring the number of phasors, number of analog quantities, names, conversion factors, low-frequency oscillation setpoints, sub / supersynchronous oscillation setpoints, and broadband oscillation setpoints for each of its broadband measurement devices, and send it to the master station.

[0027] In this invention, the harmonic and interharmonic configuration frame CFG-2H describes the harmonic and interharmonic measurement data and oscillation setpoints subscribed to by a client. The oscillation setpoint distribution process is as follows: Figure 3 As shown, when the master station needs to modify the oscillation setting of the substation, the master station modifies it and sends it to the substation via CFG-2H. The substation broadband data concentrator parses the corresponding field of CFG-2H, reads the corresponding oscillation setting, and sends it to the broadband measurement unit on the communication link via CFG-2H. After reading it, the broadband measurement unit modifies its internal setting. After each broadband measurement unit completes the modification, it returns a confirmation command frame to the substation broadband data concentrator. When all broadband measurement unit settings have been modified, the substation broadband data concentrator returns a confirmation command frame to the master station.

[0028] In this invention, the command frame and configuration frame are shown in Table 1 and Table 2.

[0029] Table 1. Structure of Harmonic Command Frame (CMD-A)

[0030] Table 2 Harmonic Configuration Frames (CFG-1H, CFG-2H)

[0031] Next, the master station sends a "Start Real-time Data Transmission" command via the command connection. After receiving the command, the substation will send harmonic and interharmonic data packets according to the verified CFG-2H file.

[0032] In this invention, the harmonic and interharmonic data frame DATA-H is used to transmit harmonic and interharmonic measurement data, mainly including the amplitude and phase angle of the harmonic and interharmonic phasors, as well as analog data. The harmonic data transmission sequence is as follows: the first frame per second transmits the phasor and frequency of the harmonic with the largest amplitude, once per second; the second frame per second transmits the phasor and frequency of the interharmonic with the largest amplitude, once per second; frames 5 to 10 (a total of 6 frames) transmit the phasors and frequencies of the 1st to 50th harmonics and the data of the 1st to 10th dominant interharmonics (5 dominant frequencies below 100Hz and 5 dominant frequencies above 100Hz) within 10 seconds.

[0033] In this invention, the harmonic data frames are shown in Table 3.

[0034] Table 3 Harmonic Data Frames (DATA-H)

[0035] In Table 3, PHASORS and ANALOG are the phasors and analog quantities of harmonics and interharmonics, and the measurement point names are set as shown in Table 4.

[0036] Table 4. Naming of Measurement Points

[0037] In this invention, the substation sends an average of 8 frames of data per second, and a total of 80 frames are sent in 10 seconds. These 80 frames include: the maximum harmonic data once every 1 second, the maximum interharmonic data once every 1 second, the harmonic numbers of the 1st to 50th harmonics updated once every 10 seconds, and the dominant interharmonic data of the 1st to 10th harmonics updated once every 10 seconds.

[0038] Based on this technical solution, the data communication volume of harmonics and interharmonics is reduced to 80 / 1000 = 8% of the original solution. Taking the real-time data traffic of the PMU as the benchmark, the real-time traffic of the original broadband communication protocol is 3 times that of the PMU, while the real-time traffic of the new broadband communication protocol is 1.16 times that of the PMU. It can be seen that this technical solution can greatly save communication bandwidth.

[0039] It should be noted that, to facilitate the master station's monitoring and management of the substation's oscillation setpoints, this invention adds oscillation setpoint content to the configuration frame. The master station can then send oscillation setpoints to the substations. The process for sending oscillation setpoints is described in [link to documentation]. Figure 3 .

[0040] Figure 2 The process of transmitting broadband harmonic and interharmonic data in this invention is illustrated, specifically including: Step 1: The broadband measurement master and slave stations use TCP as the underlying communication protocol. When data communication occurs, command connections and data connections are established. Step 2: The master station sends the command "Upload configuration frame CFG-1H file" via command connection. The substation receives the command "Upload configuration frame CFG-1H file", generates the CFG-1H file according to the local configuration of the substation, and sends it to the master station. Step 3: The master station sends the command "Download configuration frame CFG-2H file". After receiving the command, the substation replies with a positive confirmation. The master station sends the CFG-2H file. After receiving the CFG-2H file, the substation checks its validity and whether a fixed value has been sent. Step 4: When no fixed value is issued, the master station sends the "Start Real-time Data Transmission" command through the command connection. After receiving the command, the substation sends harmonic and interharmonic data periodically through the data connection according to the latest received and verified CFG-2H file. If a setpoint is issued, the substation will return a confirmation command frame after modifying the setpoint. The substation's oscillation setpoint is typically stored in a broadband measurement unit (BMU). A substation usually has multiple BMUs. When the master station transmits the oscillation setpoint to be changed to the substation's data concentrator via CFG-2H, the BMU's IDCODE can be specified in the PMU_IDCODE field of the CFG-2H configuration frame. The substation's data concentrator then parses the CFG-2H to obtain the oscillation setpoint and the BMU's IDCODE, and transmits it to the BMU via CFG-2H. The BMU parses the oscillation setpoint, modifies it, and returns a confirmation command frame to the data concentrator upon successful modification. The concentrator then replies to the master station upon receiving the confirmation command frame. The master station considers the modification of the substation's setpoint successful upon receiving the confirmation command frame.

[0041] Based on the above-described inventive concept, the present invention also provides a broadband harmonic and interharmonic data communication optimization system for implementing the aforementioned broadband harmonic and interharmonic data communication optimization method. The system includes: The configuration module is used to define the configuration frame CFG-1H, configuration frame CFG-2H, data frame DATA-H, and command frame CMD-H for harmonics and interharmonics based on the PMU communication protocol. The communication link module is used to establish command and data connections between broadband measurement master and slave stations when data communication occurs; The master station sends the command "Upload configuration frame CFG-1H file" to the substation via command connection, and after receiving the CFG-1H file, sends the command "Download configuration frame CFG-2H file"; it sends the CFG-2H file to the substation only after receiving an acknowledgment reply from the substation; and it sends the command "Start real-time data transmission" to the substation via command connection. Upon receiving the command "Upload configuration frame CFG-1H file", the substation generates a CFG-1H file based on the local harmonic and interharmonic configuration and sends it to the master station; it also verifies and saves the CFG-2H file; and based on the latest received and verified CFG-2H file, it periodically sends harmonic and interharmonic data via the data connection.

[0042] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0043] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0044] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0045] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for broadband harmonic and subharmonic data communication optimization, comprising: The method comprises the following steps: Defining configuration frame CFG-1H, configuration frame CFG-2H, data frame DATA-H and command frame CMD-H of harmonics and interharmonics on the basis of PMU communication protocol; Establishing command connection and data connection between the master station and the substation of broadband measurement when data communication occurs; The master station sends the command of "uploading configuration frame CFG-1H file" through the command connection, and the substation receives the command and generates CFG-1H file according to the local harmonics and interharmonics configuration of the substation and sends the file to the master station; After receiving the CFG-1H file, the master station sends the command of "downloading configuration frame CFG-2H file", and sends the CFG-2H file only after receiving the confirmation reply from the substation; The substation checks and saves the CFG-2H file, and the master station sends the command of "starting real-time data transmission" through the command connection; After receiving the command, the substation sends the harmonics and interharmonics data through the data connection according to the latest received and checked CFG-2H file.

2. The method of claim 1, wherein, The method comprises the following steps: The master station and the substation of broadband measurement establish command connection and data connection according to the requirements of communication protocol GB / T 26865.2; first, the command connection is established, which comprises transmission header frame, configuration frame and command frame and is transmitted bidirectionally; the data connection is used for transmitting real-time data and is transmitted unidirectionally, and the data connection is established after the command connection is established.

3. The method of claim 1, wherein the method further comprises: The configuration frame CFG-1H contains all the harmonics and interharmonics measurement data and oscillation related constants that can be sent by the broadband measurement device of the substation; After receiving the command of "uploading harmonics configuration frame CFG-1H file", the substation generates CFG-1H file according to the number of phasor and analog quantity, name, conversion factor of harmonics and interharmonics of each broadband measurement device of the substation, and low-frequency oscillation constant, subsynchronous / supersynchronous oscillation constant and broadband oscillation constant and sends the file to the master station.

4. The method of claim 1, wherein the method further comprises: The configuration frame CFG-2H contains the harmonics and interharmonics measurement data and oscillation constant subscribed by a certain client; when the master station needs to modify the oscillation constant of the substation, the master station modifies and sends the configuration frame CFG-2H to the substation.

5. The method of claim 1, wherein the method further comprises: The data frame DATA-H is used for transmitting harmonics and interharmonics measurement data, including the amplitude and phase angle of harmonics and interharmonics phasor and analog data.

6. The method of claim 5, wherein the method further comprises: The sending sequence of the data frame DATA-H for transmitting harmonics data is as follows: The phasor and frequency of the harmonic with the largest amplitude are sent in the first frame per second, once per second; The phasor and frequency of the interharmonic with the largest amplitude are sent in the second frame per second, once per second; The phasor and frequency data of the first to 50th harmonics and 1 to 10 dominant interharmonic data are sent in 5 to 10 frames within 10 seconds.

7. The method of claim 1, wherein the method further comprises: determining a frequency of the data packet; and selecting the frequency of the data packet as the frequency of the data packet to be transmitted to the receiver. The method further comprises the following steps: After receiving the CFG-2H file, the substation performs validity check, and if the check is passed, the CFG-2H file is saved as a communication configuration file locally, otherwise, the CFG-2H file is discarded.

8. The broadband harmonic and interharmonic data communication optimization method according to claim 1, characterized in that, The method further comprises the following steps: After receiving the CFG-2H file, the substation performs validity check and checks whether the oscillation constant is sent. When there is no oscillation constant value issued, the master station sends the "start real-time data transmission" command through the command connection; If there is an oscillation constant value issued, the substation data concentrator parses the corresponding field of the configuration frame CFG-2H, reads the corresponding oscillation constant value and the wideband measurement unit to be changed, and also sends CFG-2H to the wideband measurement unit on the communication link, the wideband measurement unit parses the oscillation constant value and modifies it, and returns an acknowledgement command frame to the substation data concentrator after the modification is successful. When all the wideband measurement unit constant values are modified, the substation data concentrator returns an acknowledgement command frame to the master station, and the master station determines that the modification of the substation oscillation constant value is successful after receiving the acknowledgement command frame.

9. A broadband harmonic and subharmonic data communication optimization system, characterized by, The system for implementing the wideband harmonic and interharmonic data communication optimization method of any one of claims 1 to 8 comprises: A configuration module for defining the harmonic and interharmonic configuration frame CFG-1H, the configuration frame CFG-2H, the data frame DATA-H and the command frame CMD-H on the basis of the PMU communication protocol; A communication link module for establishing the command connection and the data connection between the master and the substation when data communication occurs; The master station sends the "upload configuration frame CFG-1H file" command to the substation through the command connection, and after receiving the CFG-1H file, sends the "download configuration frame CFG-2H file" command. The CFG-2H file is sent to the substation only after receiving the acknowledgement reply from the substation. The master station also sends the "start real-time data transmission" command to the substation through the command connection; The substation generates the CFG-1H file according to the local harmonic and interharmonic configuration of the substation after receiving the "upload configuration frame CFG-1H file" command, and sends it to the master station. The substation also checks and saves the CFG-2H file, and sends the harmonic and interharmonic data through the data connection according to the latest received and checked CFG-2H file.

10. A broadband harmonic and subharmonic data communication optimization system according to claim 9, wherein, The substation is also used for, Receiving the CFG-2H file and performing validity check to check whether there is an oscillation constant value issued; When there is no oscillation constant value issued, the master station sends the "start real-time data transmission" command through the command connection; If there is an oscillation constant value issued, the substation data concentrator parses the corresponding field of the configuration frame CFG-2H, reads the corresponding oscillation constant value and the wideband measurement unit to be changed, and also sends CFG-2H to the wideband measurement unit on the communication link, the wideband measurement unit parses the oscillation constant value and modifies it, and returns an acknowledgement command frame to the substation data concentrator after the modification is successful. When all the wideband measurement unit constant values are modified, the substation data concentrator returns an acknowledgement command frame to the master station, and the master station determines that the modification of the substation oscillation constant value is successful after receiving the acknowledgement command frame.

Images