Method and system for synchronously acquiring and uploading steady-state data

Abstract

The invention relates to a steady-state data synchronous acquisition and uploading method and system, and belongs to the technical field of data acquisition and processing. According to the method, time synchronization unification is carried out on the system time of a power system master station and the time of each measurement and control device at a plant station end, each measurement and control device carries out telemetering sampling calculation according to a first set period and then uploads data needing to be uploaded to the power system master station end according to a second set period, and the second set period is integral multiple of the first set period. It is ensured that data needing to be uploaded are uploaded on the same time section; besides, the main station end of the power system performs data access according to an integral multiple of a second set period (a third set period), so that the access of the uploaded data at the same time section is ensured, and the latest data of each measurement and control device is uploaded to the main station real-time library when the data is accessed every time. According to the invention, the problem that data synchronous acquisition can be realized only by modifying a protocol, increasing data traffic and modifying master station software in the prior art is solved.

Description

Technical Field

[0001] The invention relates to a method and system for synchronously collecting and sending steady-state data, belonging to the technical field of data collection and processing. Background Art

[0002] The steady-state data of the power system is collected and uploaded by the measurement and control devices. The measurement and control devices are configured in intervals. A large number of measurement and control devices in a large number of substations collect and upload steady-state data respectively, and finally the data is collected at the dispatching master station for data support for control operations.

[0003] However, since there is no coordination between the measurement and control devices, each measurement and control device performs data collection and uploading operations according to its own timing, and there are many data collection and uploading processing links, such as Figure 1 As shown in the figure, the time-consuming dynamic discreteness of each link leads to the asynchronous transmission of steady-state data from each measurement and control device to the dispatching master station. The data corresponding to the actual time is quite different. The data taken at the same time section in the dispatching master station are not the data at the same time, which cannot support various services such as power balance calculation. Figure 2 shown.

[0004] The existing technology mainly adopts two measures to solve the above problems: sending telemetry data with time stamp and synchronous data screening. However, sending telemetry data with time stamp requires modifying the communication protocol and increasing data traffic; synchronous data screening adopts the mode of synchronous screening and packaging and sending at the plant end. Multiple measurement and control devices at the plant end each start to sample and calculate the flow data based on their own power-on time and identify and send the mutation. At the same time, some intervals have large changes and are judged as mutations, and are sent for mutation; some intervals have small changes and are not considered to be mutations and are not sent. Therefore, there is also a situation where the pace of sending mutations is inconsistent, resulting in the inability to complete the screening. Summary of the invention

[0005] The purpose of the present invention is to provide a method and system for synchronously collecting and uploading steady-state data, so as to solve the problem that the synchronous collecting and uploading mode of the prior art is complex and data synchronization cannot be completed when the pace of uploading of some interval mutations is inconsistent.

[0006] To achieve the above object, the solution of the present invention includes: A method for synchronously collecting and uploading steady-state data of the present invention comprises: The master station system time at the power system master station and the time of each measurement and control device at the plant station are synchronized and unified; each measurement and control device at the plant station is controlled to perform telemetry sampling calculation according to the first set period, and the data to be sent is sent to the power system master station according to the second set period, and the master station obtains data according to the third set period; the second set period is an integer multiple of the first set period, and the third set period is an integer multiple of the second set period.

[0007] Further, the data to be uploaded is as follows: after each measurement and control device performs telemetry sampling calculation according to the first set period, it is judged whether the difference between the data calculated by the current telemetry sampling and the data uploaded last time is greater than a preset change threshold. If the difference is greater than the preset change threshold, the data calculated by the current telemetry sampling is marked as the data to be uploaded.

[0008] Further, the second set period is greater than the maximum time consumption when each measurement and control device uploads the telemetry sampling calculation data to the master station terminal.

[0009] Further, each measurement and control device at the substation starts telemetry sampling calculation according to the first set period from the whole minute.

[0010] Further, the master station terminal of the power system starts to retrieve the uploaded data according to the third set period from the whole minute.

[0011] Further, the change threshold is 0.2% - 0.5% of the rated value of the sampling data of each measurement and control device.

[0012] The present invention also provides a steady-state data synchronous acquisition and upload system, including a processor, and the processor is used to execute a computer program to implement the steps of a steady-state data synchronous acquisition and upload method as described in any one of the above.

[0013] The beneficial effects of the present invention are as follows: as an improved invention, this method first synchronizes the time of the master station system time of the power system and the time of each measurement and control device at the substation. After each measurement and control device performs telemetry sampling calculation according to the first set period, it uploads the data to be uploaded to the master station terminal of the power system according to the second set period. The second set period is an integer multiple of the first set period, ensuring that the data to be uploaded is uploaded at the same time section. In addition, the master station terminal of the power system retrieves the data according to an integer multiple of the second set period (the third set period), ensuring that the uploaded data is retrieved at the same time section, and the latest data of each measurement and control device has been uploaded to the master station real-time database when retrieving the data each time. Therefore, the present invention can achieve the synchronization of acquisition and upload by setting the data acquisition and calculation period, upload period of each measurement and control device, and the data retrieval period of the master station terminal. The implementation process is simple, does not require modifying the protocol, nor does it require synchronous screening, solving the problem that the prior art needs to modify the protocol, increase data traffic, and modify the master station software to achieve data synchronous acquisition. Description of the Drawings

[0014] Figure 1 It is a flowchart of the data acquisition and upload processing link; Figure 2 It is a diagram of the time section for the dispatching master station to retrieve data; Figure 3 It is a flowchart of the data mutation upload processing; Figure 4 It is a schematic diagram of the synchronous upload principle of the present invention. Specific embodiments

[0015] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail clearly and completely below with reference to the accompanying drawings and embodiments.

[0016] Method embodiment: The concept of the present invention is to synchronize the time of the master station system and the time of each measurement and control device. Each measurement and control device performs telemetry sampling calculations according to a first set period, and uploads the data that needs to be uploaded from the telemetry sampling calculations to the master station end according to a second set period. Here, the second set period is an integer multiple of the first set period; finally, the master station end retrieves the uploaded data according to a third set period (an integer multiple of the second set period). The specific implementation process of this method will be described in detail below.

[0017] 1. Synchronize the time between the substation end and the master station end.

[0018] In this embodiment, both the master station end and the substation end of the power system are based on satellite time synchronization to unify the time of the master station system and the measurement and control device time.

[0019] 2. Set the sampling calculation period and upload period of each measurement and control device at the substation end.

[0020] At the substation end of the power system, all measurement and control devices cooperate and no longer perform telemetry calculations randomly. Instead, they start from the whole minute and use a fixed period T1 (the first set period) as the sampling calculation period for telemetry sampling calculations. Considering the requirements of calculation accuracy and response time, T1 is generally set to 200 ms; after each measurement and control device completes the telemetry sampling calculation of the data, it then determines the data that needs to be uploaded to the master station end according to the flowchart as shown in Figure 3 and uploads the data according to the upload period T2 (the second set period) to ensure that each measurement and control device uploads the data that needs to be uploaded at the same time interval. Specifically, Adopt a short - cycle variable upload method that combines mutation upload and periodic cycle upload. Analyze and discriminate the sampled data according to a relatively short cycle T1 and preset a change threshold (the change threshold is set at 0.2% - 0.5% of the rated value of the sampled data). After the measurement and control device reads the data calculated from the current telemetry sampling, if the difference between the currently calculated telemetry sampling data and the previously uploaded data is greater than the preset change threshold, mark the current data as data to be uploaded; otherwise, continue to read the data within this telemetry sampling calculation cycle and make a judgment. If all data has been judged, pack all the marked data to be uploaded and upload it according to the upload cycle T2. Otherwise, continue to read the telemetry data and repeat the above steps until the judgment of all the data to be uploaded within this cycle is completed. Here, the upload cycle T2 is an integer multiple of T1 to ensure that the data uploaded by all devices is the latest data calculated currently. While ensuring a certain margin (usually 3 seconds), T2 also needs to be greater than the maximum time consumption for the telemetry data to be uploaded to the master station. Currently, the maximum time consumption for the telemetry data at the substation end to be uploaded to the master station does not exceed 3s. Therefore, T2 can be set to 5s.

[0021] 3. Set the data acquisition period at the main station end of the power system.

[0022] When the main station end of the power system acquires data, start from the whole minute and acquire data according to the set period. This data acquisition period T3 (the third set period) is set as an integer multiple of T2 to ensure that the data uploaded is acquired at the same time slice, and the latest data of the measurement and control devices of each sub - station has been uploaded to the real - time database of the main station when data is acquired each time, so as to realize the synchronous acquisition of steady - state data.

[0023] The schematic diagram of the synchronous upload principle of the present invention is as Figure 4 shown. Starting from the 0 moment, 3 measurement and control devices perform data sampling and calculation every other T1 period. For example, data sampling is performed at T1 and 2T1 in the figure. After sampling for a period of time, the data to be uploaded is uploaded as a whole at T2. In the figure, P1, P2, and P3 represent the data to be uploaded by different measurement and control devices (the length of the arrow represents the different time consumption durations of the data calculated by different measurement and control devices during the process of uploading to the main station, and each time consumption duration does not exceed the duration of the upload cycle T2). Similarly, after collecting data for a period of time, the collected data is uploaded again at 2T2, and the data collected for a period of time is uploaded again at 3T2. Finally, at the main station end, according to the set data acquisition period, such as at nT2 (T3) moment, the latest data uploaded ((n - 1)T2 uploaded data) is acquired, so as to ensure that the data acquired each time is the latest data at the same moment uploaded by each measurement and control device.

[0024] System embodiment: A steady-state data synchronization acquisition and uploading system of the present invention, the system includes a processor, and the processor is used to execute computer program instructions to implement a steady-state data synchronization acquisition and uploading method introduced in the method embodiment. The method has been introduced clearly enough in the method embodiment and will not be elaborated here.

Claims

1. A method for synchronously collecting and uploading steady-state data, characterized in that: The method includes: The master station system time at the power system master station and the time of each measurement and control device at the plant station are synchronized and unified; each measurement and control device at the plant station is controlled to perform telemetry sampling calculation according to a first set period, and the data to be sent is sent to the power system master station according to a second set period, and the master station obtains data according to a third set period; the second set period is an integer multiple of the first set period, and the third set period is an integer multiple of the second set period.

2. The method for synchronously collecting and uploading steady-state data according to claim 1, characterized in that: The data that needs to be uploaded are: after each measurement and control device performs telemetry sampling calculation according to the first set period, it is determined whether the difference between the data currently calculated by telemetry sampling and the data uploaded last time is greater than the preset change threshold. If the difference is greater than the preset change threshold, the data currently calculated by telemetry sampling is marked as the data that needs to be uploaded.

3. According to the method for synchronously collecting and uploading steady-state data according to claim 1, it is characterized in that: The second set period is greater than the maximum time taken by each measurement and control device to send the telemetry sampling calculation data to the master station.

4. The method for synchronously collecting and uploading steady-state data according to claim 1, characterized in that: Each measurement and control device at the plant station end performs telemetry sampling calculation according to the first set period starting from the whole minute.

5. The method for synchronously collecting and uploading steady-state data according to claim 1, characterized in that: The power system master station obtains the uploaded data according to the third set period starting from the whole minute.

6. The method for synchronously collecting and uploading steady-state data according to claim 2, characterized in that: The change threshold is 0.2% to 0.5% of the rated value of the sampling data of each measurement and control device.

7. A steady-state data synchronous acquisition and transmission system, comprising a processor, characterized in that: The processor is used to execute a computer program to implement the steps of a method for synchronously collecting and uploading steady-state data as described in any one of claims 1 to 6.

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