Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (3): 30104-030104.doi: 10.11889/j.0253-3219.2018.hjs.41.030104


Compensating abrupt current for accelerator power supply

HUANG Shan1,2, TAN Songqing1, LI Rui1   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-11-13 Revised:2017-12-18 Online:2018-03-10 Published:2018-03-14
  • Supported by:
    Supported by the Research and Development Project of Proton Radiotherapy System based on Synchrotron (No.2016YFC0105402)

Abstract: [Background] Shanghai Synchrotron Radiation Facility (SSRF) is an advanced third-generation synchrotron radiation electron accelerator, it requires the magnetic field of long-term stability and high-accuracy. Hence the accelerator power supply is requested to keep the exciting current stable. [Purpose] This study aims to propose a dynamic current compensating method based on the load side of magnet to solve the problem of abrupt current caused by power grid voltage drop. [Methods] Band-pass filter was applied to the extraction of the abrupt current waveform, and the opposite polarity with the abrupt current was generated by real-time computation of the proportional integral (PI) controller. The compensator compensates the abrupt current by paralleling this opposite polarity current to inhibit the abrupt current at load side. [Results] Simulation and experiment results showed that the above-mentioned method has obvious effect for inhibition of abrupt current on load side. [Conclusion] The compensator is proved to be practical in restraining abrupt current.

Key words: Accelerator power supply, Abrupt current, Bandpass filtering, PI control

CLC Number: 

  • TL503