casestudy#1boilercontrol鍋爐控制(文件)
【正文】 above requirements and reduce interaction 。 CVs ? Drumlevel Control Problem ? Controlled variable: drum level, in H (s) ? Manipulated variable: feedwater flow, in F (s) ? Main disturbances: Steam flow, in D (s) S t e a mD r u mE c o n o m i z e rL T1 1L C1 1Hs pHmuF ( t )D ( t )H ( t )W a t e r f e e dPlease explain the reason why it is a difficult problem Drumlevel Characteristics DHH 0HH 2H 1ttDisturbance path characteristic (Why?) Control path characteristic (Why?) 1)()(221???? sTKsKsDsH 0()()sKHs eF s s???FHHH 1ttτModels ? Nonminimum phase Characteristics 1)()(221???? sTKsKsDsH102 1 2 122( 1 )()() ,( ) ( 1 ) ( 1 )K T sK K T s KHsD s s T s s T s? ? ???????2120 TKKT ??There will be a zero in right side of the plex plane if 02120 ??? TKKTThe process will be called “nonminimum phase system (非最小相位系統(tǒng) )” Oneelement (單沖量 ) Control Simple PID Control 0 50 100 150 200 250 300 350 4004849505152D r u m L e v e l%0 50 100 150 200 250 300 350 40045505560F e e d w a t e r F l o w%T i m e , m i nS t e a m F l o w i n c r e a s e sf r o m 1 0 T / h r t o 1 1 T / h rS t e a mD r u mL T1 1L C1 1Hs
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