Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Digital Variable Structure Control for a Hot Water Heating System

온수나방 시스템의 디지틀 가변구조제어

  • Published : 1996.02.01
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Abstract

A pilot plant, which is simplified the hot water heating control system of a large scale residential building, is used to investigate the effects of control methods and operating conditions on the system performance and to compare control characteristics. Digital variable structure controller(DVSC) and digital PI controller are implemented to control the speed of the circulating pump for the pilot plant using PC. For the DVSC, a control algorithm is suggested, which using a nonlinear sliding surface and a PID sliding surface outside and inside of output error boundary layer, respectively. Smith predictor algorithm is used for the compensation of long dead time. The suggested DVSC yields improved control performance compared with existing DVSC using linear sliding surface only. the system responses with the suggested DVSC shows good responses without overshoot for various operating conditions and robust under external disturbances compared with digital PI controller.

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References

  1. ASHRAE Technical Data Bulletin, Hydronic Systems v.1 no.7 Variable Speed Pumps for Water Chillers Water Coils, and Other Heat Transfer Equipment Theichler,W.W.
  2. ASHRAE Technical Data Bulletin, Hydronic Systems v.1 no.7 Variable Flow in Hydronic Systems for Improved Stability Simplicity, and Energy Economics Coad,W.J.
  3. IEE Proc. v.129 no.1 Multivariable Variable Structure Adaptive Model Following Control Systems Zinober,A.S.I.;EI-Ghezawi,E.;Billings,S.A.
  4. IEEE Trans.Auto.con. v.AC-32 no.10 On the Stability of Discrete Time Sliding Mode Control Systems Sarpturk,Z.;Yorgo;Okyay
  5. Implementation of Sliding Mode control by a Digital computer Furuda,K.;Morisada,M.
  6. IEE Proc. v.129 no.6 Robust Stability of Smith Predictor Controllers for Time Delay Systems Owens,D.H.;Raya,A.
  7. Chemical Engineering Process v.53 no.5 Closer Control of Loops with Dead Time Smith,O.J.M.
  8. INT. J. Control v.39 no.6 Variable Structure Model Reference Adaptive Control Systems Ambrosino,G.;Celentano,G.;Garofalo,F.
  9. 고려대학교 기계공학과 박사학위 논문 온수난방 시스템의 제어특성 및 디지틀 제어 구현에 관한 연구 안병천
  10. Principles and Practice of Automatic Process Control Smith,C.A.;Corripio,A.B.