| The heavy ion accelerator is a large-scale device that converts electrical energy into particle energy.Its operation relies on power conversion equipment such as high-power high-frequency cavities and hundreds of thousands of high-power pulse power supplies.Providing a high-quality power distribution network for these devices is the basis for ensuring the long-term reliable operation of heavy ion accelerators.At present,the development trend of a new generation of heavy ion accelerators is high energy,high beam intensity and high power.In December 2018,the “Twelfth Five-Year Plan” of the national major scientific and technological infrastructure construction medium and long-term plan(2012-2030)decided to build an internationally leading new generation of High Intensity heavy-ion Accelerator Facility(HIAF)in Huizhou,Guangdong.Because long-term reliable operation is a difficult point in the construction of high-current heavy ion accelerators,and its distribution network has power quality problems such as high power,large inductive load,fast impact load,overvoltage,resonance,and three-phase unbalance.The distribution network may be in a faulty state due to force majeure such as natural disasters,external damage,equipment failures,etc.The power electronic equipment in the distribution network either evades quickly,or passively withstands the impact of faults,or actively participates in the fault defense of the power grid.However,if there is a lack of failure state mechanism analysis and systematic defense design,engineering applications will face huge challenges.In order to ensure the high-quality power quality of HIAF,while studying the problems of HIAF power quality and equipment failure,accelerator performance,beam current correlation,etc.,this subject investigates the structure and characteristics of the heavy ion accelerator distribution network,and focuses on the power quality of the HIAF distribution network.For the existing special problems,a set of heavy ion accelerator power quality monitoring system was designed and implemented based on EPICS.First of all,this subject investigates the development status of heavy ion accelerators,and then uses software such as Phoebus,Archiver Appliance,combined with the file subscription system Kafka to design and implement a set of heavy ion accelerator power quality monitoring system,including data acquisition subsystem,data storage sub-system System,alarm subsystem,and adopts network time protocol(NTP).Finally,the accelerator power quality monitoring system was deployed on the heavy ion accelerator in Lanzhou(HIRFL).After testing,the system can realize the real-time acquisition and storage of nearly 10,000 power quality data and the visualization of waveform data.The requirements for real-time,long-term stability,and reliability have been met,and the design goals have been reached.In addition,system alarm messages can be pushed through We Chat,and the power quality data can be monitored online on the PC and mobile phones.This improves the efficiency of accelerator operation and maintenance.The system has the characteristics of low cost,easy upgrade,high scalability and reliable operation.It integrates large-scale data real-time collection,storage,accumulation,fault alarm,and data visualization,and is easy to integrate with the accelerator control system.The power quality monitoring system has realized the informatization and networking of the accelerator distribution network,laying the foundation for the intelligentization of the heavy ion accelerator distribution network.At the same time,it provides the necessary technical means for the construction of a new generation of high-power high-current heavy ion accelerator HIAF. |
