Development Of Monitoring Clock Synchronization System In Distributed Hydropower Plant

Power plant is the source of energy for the whole power system, which plays an important role in protecting the safe and reliable operation of the National Grid. With thegrowing scale、increasingly high degree of intelligentialization and automation ofNational Grid, the size and structure of the hydroelectric power plants have becomeincreasingly large and complex. Especailly in recent years, new theories、technologiesand intelligent electronic devices are constantly applied in the construction of theNational Grid. However, these intelligent electronic devices need an accurate andreliable reference clock source to work properly. That’s why clock synchronization isespecially important in distributed monitoring system of hydropower plant. Therefore,the main work of this paper is to study a clock synchronization system with highersynchronization accuracy and develops a higher clock synchronization system.Firstly, this paper introduces a synchronous clock source device designed andachieved by a hardware description language (HDL) and FPGA technology, accordingto the actual needs of the plant clock synchronization technology. The circuit designprocesses of the GPS、NTP、the hard pulse timing (1PPS/1PPM)、serial packets andIRIG-B code timing are given in detail. The Clock synchronization performance of thisset of device meets the request of the LUC、Protect Device and host computer server inthe hydropower plants by experiments.Secondly, according to the actual needs of the plant clock synchronizationtechnology, this paper uses a hardware description language (HDL) and FPGAtechnology to design a synchronous clock source device. The circuit design processes ofthe GPS、NTP、the hard pulse timing (1PPS/1PPM)、serial packets and IRIG-B codetiming are given in detail. Through experiments, clock synchronization performance ofthis set of device meets the request of the LUC、Protect Device and host computerserver in the hydropower plant.Finally, according to characteristics of the current distributed hydropower plant,GPS clock synchronization technology is selected as the clock synchronization methodbetween distributed hydroelectric power plant and the dispatch center, while the hard pulse timing(1PPS/1PPM)、IRIG-B、NTP clock synchronization technologies are usedin LCUs、Protecting Devices and host computer servers of the hydropower plants. Bothof which together constitute the entire clock synchronization system.