Master station system full data refreshing method

Abstract

The application relates to a main station system full data refreshing method, which comprises the following steps: 1) a main station system side counts the response time of each transformer station remote device to a total calling command; 2) a remote device in each transformer station counts the total calling time interval of the main station system to each time of issuing a total calling; 3) the remote device in each transformer station counts the time used from issuing a total calling command to the end of refreshing the response total calling data in the last interval; 4) after the remote device in the transformer station is restarted, the average response time of the total calling data in the transformer station and the total calling time interval issued by the main station need to be counted again; and 5) data is uploaded. Based on the existing equipment level and the communication network conditions inside and outside the transformer station, the application improves the time consistency of sampling data, realizes that the transformer station side responds to the total calling command issued by the main station after about 100 ms of the completion of the total calling of the transformer station, and better improves the time consistency of the cross-section data of the whole network.

Description

Technical Field

[0001] This invention belongs to the field of power grid data technology, specifically relating to a method for full data refresh of a master station system. Background Technology

[0002] The significant increase in installed capacity of new energy power generation has increased the difficulty of grid stability control. In order to grasp the grid operating status in a timely manner, the higher the temporal consistency of grid section data, the closer the stability calculation results can be to the actual operating status of the grid, and the more conducive it is to controlling the safe and stable operation of the grid.

[0003] The current main station system data acquisition network is as follows: Figure 1 As shown, the current telemetry data transmission process at measurement points is mainly as follows:

[0004] 1) The measurement and control device directly collects the three-phase voltage and current of the measuring point through AC sampling and calculates the active and reactive power to obtain the real-time telemetry information of the measuring point;

[0005] 2) The telemetry and control device will determine the acquired telemetry information. If the change is greater than the change dead zone value compared with the previous sampling, the telemetry data will be actively sent to the remote control device. If the change is less than the change dead zone, the data will be used to refresh the real-time value of the telemetry and control device.

[0006] 3) The remote control unit receives telemetry values ​​from various measurement and control devices in the substation and updates the local real-time database. When the change in the received telemetry value is greater than the dead zone value, the telemetry data is actively sent to the master station system. On the other hand, every certain period of time (about 10 minutes), the remote control unit will issue a general call command to summon the current real-time values ​​of all local measurement points and update the remote real-time data.

[0007] 4) The master station system receives telemetry values ​​from each substation and updates its local real-time database. Simultaneously, it issues a general call command every regular interval (approximately 10 minutes) to retrieve real-time data from all substations and update the master station's local real-time data. This local real-time data is the source for various advanced power grid control applications.

[0008] The main problems at present are: due to the inconsistent load characteristics of each measuring point, the telemetry values ​​of some measuring points are increasing, some are decreasing, some remain stable, some data change slowly, and some data change quickly.

[0009] In the existing data acquisition mode, on the one hand, rapidly changing telemetry data can be quickly uploaded to the remote control unit (RTU) via active upload from the telemetry and control device, and then transmitted to the master station system via active upload from the RTU. However, for data that increases or decreases slowly, since the change is less than the change dead zone, it cannot be uploaded via change and must wait for the RTU's data recall; similarly, data in the RTU that is less than the change dead zone also needs to be recalled by the master station to be transmitted to the master station system.

[0010] On the other hand, the master station data recall and the substation remote control device data recall operate completely independently. In the worst case, after the remote control device initiates its own recall, the master station system does not issue a recall until the remote control device issues its next data recall.

[0011] This results in very poor time consistency of power grid section data. Summary of the Invention

[0012] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for full data refresh of a main station system.

[0013] The technical problem solved by this invention is achieved through the following technical solution:

[0014] A method for full data refresh of a main station system, characterized in that: the steps of the method are as follows:

[0015] S1. The main station system counts the response time of each substation remote control device to the general call command, that is, the total time required from the issuance of the general call command to the start of the first general call response data refresh; the main station system counts the average of the 512 most recent general calls since the last start. Assuming that the response time of the i-th general call of the m-th substation is Am1, Am2, ..., Ami respectively; then the average general call response time T0m = (Am1 + Am2 + ... + Ami) / i, and the above calculation is performed when i ≧ 5, and the value of i is [0, 511].

[0016] Thus, the master station system learns the response time T01, T02...T0 of each substation to the general call command. m ;

[0017] S2. The remote control devices in each substation shall respectively count the time interval between each total call issued by the master station system to this station. For the m-th station, the total call time intervals are tm1, tm2, ..., tmk respectively. Calculate the average total call issuance cycle T1m = (tm1 + tm2 + ... + tmk) / k; the value of k is [0, 127].

[0018] S3. The remote control devices in each substation calculate the time taken from issuing a general call command to the end of the last interval response to the general call data refresh. The devices calculate the average of the 128 most recent general calls since the last start. For the m-th substation, assuming the time required for n calls is Bm1, Bm2, ..., Bmn respectively, when n ≥ 5, calculate the average response time of the data general call in the substation as Pm = (Bm1 + Bm2 + ... + Bmn) / n; the value of n is [0, 127].

[0019] S4. After the remote control device of substation m is restarted, the average response time Pm of the total data call in the substation needs to be recalculated, and the time interval T1m of the total call issued by the master station needs to be recalculated. After the parameter changes affecting the communication of all substations, the response time T0 of the total data call in the master station system needs to be recalculated. After the communication parameters or channel interruption of substation m are restored, the response time T0m of the total data call in the substation needs to be recalculated.

[0020] S5. Data upload process:

[0021] For the main station side:

[0022] If the current time is S, which is the moment when a general call has just been issued, and the general call time interval is a settable value Q, then the master station system issues a general call command to each substation according to S-Q+T0m. After receiving the data general call command, the substation sends up the remote control real-time information.

[0023] For the substation side:

[0024] The remote control device has already recorded the time interval T1m for the master station to issue a general call and the time Pm for the station equipment to respond to the general call.

[0025] If the current time is R and the next general call time of the master station is R+T1m, then the remote control unit (RTU) issues a general call command for its own data at time R+T1m-Pm-0.1. With 0.1 milliseconds as the data preparation margin within the station, the RTU initiates a general call command for the station after time R+T1m-Pm. After the general call data preparation is completed, the last interval data is uploaded after R+T1m-0.1. 100ms later, the RTU's real-time data preparation is completed, and it begins to respond to the master station system's general call command for its own station, realizing the real-time consistent data transmission of the substation to the master station.

[0026] The advantages and beneficial effects of this invention are as follows:

[0027] Based on existing equipment levels and the communication network conditions inside and outside the substation, this invention improves the time consistency of sampling data, enabling the substation to respond to the main station's general call command approximately 100ms after completing its own general call, thus significantly improving the time consistency of data across the entire network. Attached Figure Description

[0028] Figure 1 This is a diagram of the current main station system's data acquisition network.

[0029] Figure 2 This is a flowchart of the present invention. Detailed Implementation

[0030] The present invention will be further described in detail below through specific embodiments. The following embodiments are merely descriptive and not limiting, and should not be used to limit the scope of protection of the present invention.

[0031] like Figure 2 As shown, a method for full data refresh of a main station system is innovative in that the steps of the method are as follows:

[0032] S1. The main station system counts the response time of each substation remote control device to the general call command, that is, the total time required from the issuance of the general call command to the start of the first general call response data refresh; the main station system counts the average of the 512 most recent general calls since the last start. Assuming that the response time of the i-th general call of the m-th substation is Am1, Am2, ..., Ami respectively; then the average general call response time T0m = (Am1 + Am2 + ... + Ami) / i, and the above calculation is performed when i ≧ 5, and the value of i is [0, 511].

[0033] Thus, the master station system learns the response time T01, T02...T0 of each substation to the general call command. m ;

[0034] S2. The remote control devices in each substation shall respectively count the time interval between each total call issued by the master station system to this station. For the m-th station, the total call time intervals are tm1, tm2, ..., tmk respectively. Calculate the average total call issuance cycle T1m = (tm1 + tm2 + ... + tmk) / k; the value of k is [0, 127].

[0035] S3. The remote control devices in each substation calculate the time taken from issuing a general call command to the end of the last interval response to the general call data refresh. The devices calculate the average of the 128 most recent general calls since the last start. For the m-th substation, assuming the time required for n calls is Bm1, Bm2, ..., Bmn respectively, when n ≥ 5, calculate the average response time of the data general call in the substation as Pm = (Bm1 + Bm2 + ... + Bmn) / n; the value of n is [0, 127].

[0036] S4. After the remote control device of substation m is restarted, the average response time Pm of the total data call in the substation needs to be recalculated, and the time interval T1m of the total call issued by the master station needs to be recalculated. After the parameter changes affecting the communication of all substations, the response time T0 of the total data call in the master station system needs to be recalculated. After the communication parameters or channel interruption of substation m are restored, the response time T0m of the total data call in the substation needs to be recalculated.

[0037] S5. Data upload process:

[0038] For the main station side:

[0039] If the current time is S, which is the moment when a general call has just been issued, and the general call time interval is a settable value Q, then the master station system issues a general call command to each substation according to S-Q+T0m. After receiving the data general call command, the substation sends up the remote control real-time information.

[0040] For the substation side:

[0041] The remote control device has already recorded the time interval T1m for the master station to issue a general call and the time Pm for the station equipment to respond to the general call.

[0042] If the current time is R and the next general call time of the master station is R+T1m, then the remote control unit (RTU) issues a general call command for its own data at time R+T1m-Pm-0.1. With 0.1 milliseconds as the data preparation margin within the station, the RTU initiates a general call command for the station after time R+T1m-Pm. After the general call data preparation is completed, the last interval data is uploaded after R+T1m-0.1. 100ms later, the RTU's real-time data preparation is completed, and it begins to respond to the master station system's general call command for its own station, realizing the real-time consistent data transmission of the substation to the master station.

[0043] Based on existing equipment levels and the communication network conditions inside and outside the substation, this invention improves the time consistency of sampling data, enabling the substation to respond to the main station's general call command approximately 100ms after completing its own general call, thus significantly improving the time consistency of data across the entire network.

[0044] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A method for full data refresh of a main station system, characterized in that: The steps of the method are as follows: S1. The main station system side counts the response time of each substation remote control device to the general call command, that is, the total time required from the issuance of the general call command to the start of refreshing the first general call response data; The main station system counts the average of the 512 most recent general calls since the last startup. Assuming that the response time of the i-th general call of the m-th substation is Am1, Am2, ..., Ami respectively; then the average general call response time T0m = (Am1 + Am2 + ... + Ami) / i, and the above calculation is performed when i ≧ 5, and the value of i is [0, 511]. Thus, the master station system learns the response time T01, T02...T0 of each substation to the general call command. m ; S2. The remote control devices in each substation shall respectively count the time interval between each total call issued by the master station system to this station. For the m-th station, the total call time intervals are tm1, tm2, ..., tmk respectively. Calculate the average total call issuance cycle T1m = (tm1 + tm2 + ... + tmk) / k; the value of k is [0, 127]. S3. The remote control devices in each substation calculate the time taken from issuing a general call command to the end of the last interval response to the general call data refresh. The device calculates the average of the 128 most recent general calls since the last start. For the m-th substation, assuming the time required for n calls is Bm1, Bm2, ..., Bmn respectively, when n ≥ 5, calculate the average response time of the data general call in the substation as Pm = (Bm1 + Bm2 + ... + Bmn) / n; the value of n is [0, 127]. S4. After the remote control device of substation m is restarted, the average response time Pm of the total data call in the substation and the average issuance cycle T1m of the total data call in the master station need to be recalculated. After the parameter changes affecting the communication of all substations, the response time T0 of the total data call in the master station system needs to be recalculated. After the communication parameters or channel interruption of substation m are restored, the response time T0m of the total data call in the substation needs to be recalculated. S5. Data upload process: For the main station side: If the current time is S, which is the moment when a general call has just been issued, and the general call time interval is a settable value Q, then the master station system issues a general call command to each substation according to S+Q-T0m. After receiving the data general call command, the substation sends up the remote control real-time information. For the substation side: The remote control device has already calculated the average total call issuance cycle T1m and the average response time Pm of the total data call within the station. If the current time is R and the next general call time of the master station is R+T1m, then the remote control unit (RTU) will issue a general call command for its own data at the time R+T1m-Pm-0.

1. The 0.1 milliseconds is the data preparation margin within the station. After the time R+T1m-Pm, the RTU will initiate a general call command for the station. After the general call data preparation is completed, after R+T1m-0.1, the last interval data will be uploaded. After 100ms, the RTU's real-time data preparation is completed, and it will begin to respond to the master station system's general call command for its own station, thus realizing the real-time consistent data transmission of the substation to the master station.

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