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By J F Herbst; International Federation of Automatic Control. Technical Committee on Applications

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Read or Download Automatic control in power generation, distribution, and protection : proceedings of the IFAC Symposium, Pretoria, Republic of South Africa, 15-19 September 1980 PDF

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Extra info for Automatic control in power generation, distribution, and protection : proceedings of the IFAC Symposium, Pretoria, Republic of South Africa, 15-19 September 1980

Example text

M 0 ; = l 2 21 2 21 5 = l 2lbari Y :L -------: '----�-t' ��: J t: � 20 � 40 60 [m;n J b ) Responses to setpoint s teps w ( k ) 1 of the s team temperature . Two main feedback control lers . S team temperature contro l l e r : PID r 0 S team pressure control ler : 0. PI r = = c ) Responses t o s e tpoint s teps w 2 ( k ) of the steam pressure . Two main feedback controllers . ( c ontrollers as b ) ) . c) v �al lvi i i R . 3 P C 3 3 PC 3 -1 v b -10 r· u1 [%] -5 _____ '' l ..... -1 2 PC 2 u}%1 F E E D F O RWARD -5 -1 0 -10 20 40 60 [min] 20 d) Responses to a disturbance step v (k ) ( s team flow) .

The assumption of a special parame tric model structure as required for parame ter estima­ tion a l lows a better e limination of noi s e ef­ fects than with nonparametric identi fication methods . With regard to the appli cation of general purpose digital computers and process com­ puters (or other equipments ) a process iden­ tifi cation can be performed off- line or on­ line . For off- line identification the process data i s first s tored ( e . q . recorder , maqnetic tape , punched tape ) .

This leads to following advantages : o Automa�ion of design and s tart-up of compu­ ter control . o Simulations of the closed loop behaviour wi th various control algorithms and control s chemes wi thout disturbing the proces s . Easy modi ficati on . o Saving of implementation and start-up time , especially for processes with lerge sett­ l i ng times or comp l i cated behaviour . R . I sermann xlvi i i o Improvement of control per formance by better adapted s imp le algori thms or more sophisti­ cated control algorithms .

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