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Application of time synchronization device (GPS clock) in SCADA system of power grid

2020-11-10 11:31:12 ahjzdz

Time synchronization device (GPS The clock ) In the grid SCADA System application

Time synchronization device (GPS The clock ) In the grid SCADA System application

Beijing Zhun electronic technology official micro ——ahjzsz

1. summary  

     Integrated automation of power grid dispatching System SCADA The function is dispatcher 、 The centralized controller provides the real-time data and information of each substation , And it can make it easy for them to repeat the accident or query historical data and information . In system design , More to consider is the network structure 、 Communication protocol conversion 、 Data storage mode media and meet SCADA Several performance requirements of the function , And did not consider the impact of the system clock synchronization across the network . Because the clock of the whole network is not synchronized, some special faults will be caused , Such as the loss of data and information 、SOE The logic of event information is chaotic 、 Some workstations crash or even system crash , So in order to eliminate the impact of clock asynchrony , It is necessary to analyze the role of clock synchronization in the system and various implementation methods .
     Integrated automation of power grid dispatching The system is a real-time system , It collects real-time data and information from various substations , After the processing of the system software , Display the relevant data and information in the workstation or store it in the historical database . Integrated automation of power grid dispatching The system is divided into station end system and master station end system , The clock synchronization of the whole network is implemented in three parts :
    ① Each workstation of the master station system is synchronized with the master server ;
    ② The master control unit of each station end system is synchronized with the master station end system ;
    ③ Time synchronization between the master control unit of each station end system and the intelligent unit of each bay .
2. Master station system timing

     The purpose of time synchronization between each workstation of the master station system and the master server is , It's to ensure that the data increases 、 change 、 The consistency and integrity of the whole network during deletion and other operations . Data inconsistency and incompleteness will cause the main and standby systems to switch or the historical data to be stored , Failure to correctly identify data consistency and integrity , This will cause the loss of information and data , It can even lead to system paralysis . Due to the long-term operation of the crystal chip of each workstation and server , There will be clock inaccuracy due to leakage or other reasons , Therefore, it is necessary for the master station to implement the corresponding network , See the picture for details 1、 chart 2 The way shown :
    In general, the time synchronization mode of master station end system does not use figure 1 The way , because GPS Generally, clock devices only provide one network interface , In addition, in order to achieve and GPS Right time , Servers 、 Both workstation and front-end computer need to run time synchronization process , And waste system resources . Use the chart 2 The way of timing , It only needs the front-end computer to run the time synchronization process regularly with the GPS Clock device is used for timing , And regularly broadcast the timing command to the server, workstation and other network equipment , Thus, it is convenient to realize the time synchronization of the whole system , Therefore, the time synchronization mode of the master station end system generally adopts the figure 2 The way . The data is written into the history database or the report is printed on time , At this time, if the system alignment is carried out, it will be due to the inconsistency of time , And cause data loss or system failure . For this reason , Time synchronization period ( Company : minute ) It should not be 60 The integral divisor of, for example 2、3、4、5 etc. , At the same time, the time synchronization period should not be too long , Therefore, we suggest that every 7 The minute system checks the time once . The operation shows that the timing period can meet the needs of normal operation of the system .

    3. The system of each plant and station is synchronized
     The master control unit of each station end system is synchronized with the master station end system , And the purpose of time synchronization between the master control unit of each station end system and the intelligent unit of each bay , It is to ensure the real-time data information collected by intelligent units in each interval , After the master station system has been processed , Can correctly replay the time when data or information occurred 、 Sequence and logic . dispatcher 、 According to the data and information displayed , Master the operation status of the primary power system in real time , So as to ensure economic dispatch 、 Security scheduling .
    Some unattended substation station end system is installed with GPS Clock device , Therefore, there is no need to synchronize with the master station system . No installation GPS Station side system of clock device , Through the master station front-end computer broadcast time synchronization command , Because there is no need for data processing , Therefore, the timing period can be set for a longer time, such as 30 minute .

 

     Installed with GPS The time synchronization mode between the station end system of the clock device and the intelligent units of each bay can be as shown in the figure 3、 chart 4 The way shown :
    chart 3 The special time network is used in the time synchronization mode of , Although it can improve the accuracy of time synchronization , But with the addition of network devices , At the same time, it increases the resource burden of intelligent unit . The more commonly used method of time synchronization is graph 4 Shown , from GPS The clock device is connected to the network through the master control unit . The main control unit and GPS After the clock device is timed , Through the network broadcast time command , Realize the time synchronization with intelligent units of each bay , The timing period can be set to 30 minute .

    4. Conclusion
    As mentioned above , In order to prevent the loss of data and information caused by the clock synchronization of the whole network 、SOE The logic of event information is chaotic 、 Some workstations crash or even system failure , We must take corresponding measures to realize Integrated automation of power grid dispatching Clock synchronization of the whole network . Realization Integrated automation of power grid dispatching Clock synchronization mode of the whole network , It is generally used GPS After the clock device is synchronized with the front-end computer or the main control unit , The front-end computer or the main control unit uses the network broadcast time synchronization command to realize the time synchronization with each interval intelligent unit , In this way, it is necessary to set the time synchronization period to meet the operation requirements .

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