Time Signal Processing Analysis and Improvement for DCS Level 2 System Based on ADACS_N Platform
Digital distributed control system of nuclear power plant puts forward higher requirements for time signal processing than conventional mosaic disk control mode.As an information monitoring and operation control system,the DCS level 2 is responsible for processing real-time data of the DCS level 1 and level 2 interfaces and displaying the processing results on the human monitoring interface.The processing of time signal in DCS level 2 includes system clock synchronization and processing of real-time data time of the DCS level1 and level 2 interfaces.Based on the research of time synchronization mechanism,time synchronization monitoring and alarm mechanism,real-time data timestamp analysis resolution mechanism and real-time data timestamp filtering mechanism in DCS level 2,the time signal processing mechanism is studied by dealing with the site issues,and combined with log code analysis and simulation test,some issues with the mechanism are observed,such as the restart of network clock protocol on the hour,the time synchronization monitoring and alarm mechanism needing to be optimized,real-time data timestamp overwrite,and unreasonable real-time data filtering mechanism which may lead to a discrepancy in DCS level 1 and level 2.Finally,these mentioned issues on time processing mechanism is optimized one by one to ensure the effectiveness of DCS level 2 time processing mechanism,which makes DCS level 2 runs reliably.
distributed control systeminformation monitoring and operation control systemtime synchronizationreal-time data analysis and filtering
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