Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Operation Characteristic and Harmonic Analysis of 200-MW Modulator

200-MW 모듈레이터의 동작 특성 및 고조파 해석

  • Park, S.S. (Linac Division, Pohang Accelerator Laboratory, Pohang University of Science and Technology) ;
  • Oh, J.S. (Linac Division, Pohang Accelerator Laboratory, Pohang University of Science and Technology) ;
  • Cho, M.H. (Linac Division, Pohang Accelerator Laboratory, Pohang University of Science and Technology) ;
  • NamKumg, W. (Linac Division, Pohang Accelerator Laboratory, Pohang University of Science and Technology)
  • 박성수 (선형가속기 개발단, 포항가속기 연구소, 포항공과대학교) ;
  • 오종석 (선형가속기 개발단, 포항가속기 연구소, 포항공과대학교) ;
  • 조무현 (선형가속기 개발단, 포항가속기 연구소, 포항공과대학교) ;
  • 남궁원 (선형가속기 개발단, 포항가속기 연구소, 포항공과대학교)
  • Published : 1994.07.21
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Abstract

200-MW pulse modulators(total 11units) for the PLS linac employ the SCR phase control circuit. It controls 3-phase AC line voltage for the high-voltage DC power supply (DCPS, maximum of 25kVDC, 4.2A) which charges the pulse forming network(PFN). The PFN delivers 400kV, 500A, ESW $7.5{\mu}s$ pulse power to the 80-MW klystron amplifier tube. The SCR regulates 3-phase AC power and feeds to the high voltage transformer. Two different types of the transformer configurations namely ${\Delta}-{\Delta}$ and ${\Delta}-Y$, are alternatively installed to 11 modulator units for the suppression of harmonic noises. RC filters and reactors are also installed. Currently, approximately 110-kW of average AC power per unit is consumed at the normal operation level of the modulator with 30pps. This paper presents the operational characteristics of the high power pulse modulator, especially the experimental results of the AC line harmonic components generated by the operation of the high power pulse modulator to suppress the switching noises from the SCR and rectifying diode arrays.

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