Visualization of the Economic Impact of Process Uncertainty in Multivariable Control Design
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1 Vsualzaton of the Economc Impact of Process Uncertanty n Multvarable Control Desgn Benjamn Omell & Donald J. Chmelewsk Department of Chemcal & Bologcal Engneerng Illnos Insttute of echnology Mass r r max f w r mn k1 A B( desred ) k2 B C( undesred ) Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
2 Outlne Proft control based tunng: MPC Senstvty to soft-constrants tunng Proft Control: Extended formulaton Measurement nformaton formulaton Colored nose formulaton Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
3 Concept of Back-Off Pont Selecton CV' s Constrant Polytope Backed-off Operatng Ponts Expected Dynamc Operatng Regons Optmal Steady-State Operatng Pont MV' s Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
4 BOP Optmzaton Problem s', m', q', XY,, ( ) ( ) x A BL x A BL GwG z ( Dx Du L) x( Dx Du L) Dw wd z 1 nz 1 Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng mn g q ' s.t. s ' As ' Bm' q q D s D m q q q mn max ' ( x ' u ') ' ( q ' q ' ) ( q ' q ' ) 1/2 max 1/2 mn th column w
5 BOP Optmzaton Problem s', m', q', XY,, ( ) ( ) x A BL x A BL GwG z ( Dx Du L) x( Dx Du L) Dw wd z 1 nz 1 Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng mn g q ' s.t. s ' As ' Bm' q q D s D m q q q mn max ' ( x ' u ') ' ( q ' q ' ) ( q ' q ' ) 1/2 max 1/2 mn th column w
6 BOP Optmzaton Problem s', m', q', XY,, ( ) ( ) x A BL x A BL GwG z ( Dx Du L) x( Dx Du L) Dw wd z 1 nz 1 Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng mn g q ' s.t. s ' As ' Bm' q q D s D m q q q mn max ' ( x ' u ') ' ( q ' q ' ) ( q ' q ' ) 1/2 max 1/2 mn th column w
7 BOP Optmzaton Problem s', m', q', XY,, Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng mn g q ' s.t. s ' As ' Bm' q q D s D m q q q mn max ' ( x ' u ') ' ( q ' q ' ) ( q ' q ' ) 1/2 max 1/2 mn ( ) ( ) x A BL x A BL GwG z ( Dx Du L) x( Dx Du L) Dw wd z 1 nz 1 th column w
8 BOP Optmzaton Problem s', m', q', XY,, Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng mn g q ' s.t. s ' As ' Bm' q q D s D m q q q mn max ' ( x ' u ') ' ( q ' q ' ) ( q ' q ' ) 1/2 max 1/2 mn ( AX BY ) ( AX BL) G G ( D x X D Y) u Where L=YX -1 ( D x w X DuY ) X
9 Outlne Proft control based tunng: MPC Senstvty to soft-constrants tunng Proft Control: Extended formulaton Measurement nformaton formulaton Colored nose formulaton Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
10 MPC mn x Qx 2u Mx u Ru xu, k 1 s.. t x Ax Bu Gw k k k k k k k 1 k k k z D x D u D w k 1 x k u k w k z z z 1 n mn max, k z Optmzaton Generates the gan, not Q,R, and M for LQR controller? Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
11 Inverse Optmalty Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
12 A Inverse Optmalty heorem 1 (Chmelewsk & Manthanwar, 24): If there exsts P > and R > such that P PA Q L R 1 L PB RL A L 1 PB M R PB M M R PB P PA L R PB hen M ( L R PB) and Q L RL A P PA are such that Q M M R R and P and L satsfy Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
13 Controller Equvalence heorem 2 (Chmelewsk & Manthanwar, 24): he controller generated by Proft Control s concdent wth the controller generated by some LQR problem. Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
14 Outlne Proft control based tunng: MPC Senstvty to soft-constrants tunng Proft Control: Extended formulaton Measurement nformaton formulaton Colored nose formulaton Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
15 Mass-Sprng-Damper Example f Mass w r r max System Model: r 1 r f w v v where r s the mass poston, v s the velocty, f s thenput force (MV) and w s the dsturbance force r mn System Constrants: 1 r 1 and f 16 Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
16 Mass Poston Mass-Sprng-Damper Example f Mass w r r max System Model: r 1 r f w v v where r s the mass poston, v s the velocty, f s thenput force (MV) and w s the dsturbance force r mn System Constrants: 1 r 1 and f 16 OSSOP * Backed-off Operatng Pont (BOP) Upper Bound on Poston } tme EDOR Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
17 Mass Poston Mass Poston Mass-Sprng-Damper Example f Mass w r r max System Model: r 1 r f w v v where r s the mass poston, v s the velocty, f s thenput force (MV) and w s the dsturbance force r mn System Constrants: 1 r 1 and f 16 OSSOP * Backed-off Operatng Pont (BOP) Upper Bound on Poston OSSOP * Backed-off Operatng Pont (BOP) Upper Bound on Poston } } EDOR tme EDOR tme Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
18 Mass Poston (m) Mass-Sprng-Damper Example (Impact of Constrants ) Case B Case C -.4 Case A Input Force (N) Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
19 Mass Poston (m) Dscrete-tme Smulaton (Scatter Plot) Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng Input Force (N)
20 Mass Poston (m) MPC and the EDOR mn x Qx 2u Mx u Ru xu, k 1 s.. t x Ax Bu Gw k 1 k k k k 1 x k u k w k z z z 1 n mn max, k z Illnos Insttute of echnology k k k k k k z D x D u D w Department of Chemcal and Bologcal Engneerng Input Force (N)
21 Soft Constrants mn x Qx 2u Mx u Ru s s xu, k 1 s.. t x Ax Bu Gw k 1 k k k z D x D u D w k 1 x k u k w k z s z z s 1 n s mn max, k z Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
22 Soft Constrants mn x Qx 2u Mx u Ru s s xu, k 1 s.. t x Ax Bu Gw k 1 k k k z D x D u D w k 1 x k u k w k z s z z s 1 n s mn max, k z Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
23 Mass Poston (m) Mass Poston (m) MPC wth Soft Constrants Input Force(N) Input Force(N) g m = 1 7 g f = 1 3 g m = 1 3 g f = 1 3 Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
24 Flexblty n EDOR Defnton 11 * z 1 22 z 2 = 1 constrant observance ~84% of tme = 2 constrant observance ~97.8% of tme = 3 constrant observance ~99.9% of tme Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
25 Mass Poston (m) Mass Poston (m) Impact of EDOR Defnton Input Force (N) Input Force (N) = 1 = 2 Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
26 Mass Poston (m) Mass Poston (m) MPC wth Soft Constrants EDOR = 2 std dev s Input Force(N) Input Force(N) g m = 1 7 g f = 1 3 g m = 1 3 g f = 1 3 Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
27 Mass Poston (m) Mass Poston (m) Mass Poston (m) Mass Poston (m) Mass Poston (m) Mass Poston (m) Impact of EDOR Defnton (Reduced Senstvty to Soft Weghts) Input Force (N) Input Force(N) Input Force(N) Input Force (N) Input Force(N) Input Force(N) g m = g f = g m = 1 7 g f = 1 3 g m = 1 3 g f = 1 3 Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
28 Outlne Proft control based tunng: MPC Senstvty to soft-constrants tunng Proft Control: Extended formulaton Measurement nformaton formulaton Colored nose formulaton Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
29 Back to the FCC Example Partal-state nformaton Correlated nose, shapng flter. Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
30 Lnear State Dscrete-tme Model Controller Prospectve w k SF d k z k u k FCC y k Illnos Insttute of echnology x Ax Bu Gd k 1 k k k z D x D u D d k x k u k w k y Cx v xˆ Ax Bu G( m Cxˆ ) k 1 k k k Department of Chemcal and Bologcal Engneerng k
31 Lnear State Dscrete-tme Model Controller Prospectve w k SF d k z k u k FCC y k KF xˆk Illnos Insttute of echnology x Ax Bu Gd k 1 k k k z D x D u D d k x k u k w k y Cx v xˆ Ax Bu G( m Cxˆ ) k 1 k k k Department of Chemcal and Bologcal Engneerng k
32 Lnear State Dscrete-tme Model Controller Prospectve w k SF d k z k L u k FCC y k KF xˆk Illnos Insttute of echnology x Ax Bu Gd k 1 k k k z D x D u D d k x k u k w k y Cx v xˆ Ax Bu G( m Cxˆ ) k 1 k k k Department of Chemcal and Bologcal Engneerng k
33 Covarance Analyss Assume controller L s gven and calculate : u Lx Lyapunov equaton (FSI case) 1 n z z z 1 ( A BL) ( A BL) G G ) D x x w z ( Dx Du L) x( Dx Du L Dw th column w w Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
34 Covarance Analyss PSI Assume controller L s gven and calculate : ( A BL) ( A BL) xˆ A C ( C C ) C A ( D D L) ( D D L) D D D D z x u xˆ x u x e x w w w Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng xˆ 1 e e v e 1 n z z ˆ z u Lx Lyapunov equaton (PSI) 1 th column
35 BOP Optmzaton Problem s', m', q', XY,, mn g q ' s.t. s ' As ' Bm' q q D s D m q q q mn max ' ( x ' u ') ' ( q ' q ' ) ( q ' q ' ) 1/2 max 1/2 mn ( AX BY ) ( AX BL) G G ( D x X D Y) u ( D x w X DuY ) X Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
36 BOP Optmzaton Problem s', m', q', XY,, mn g q ' s.t. s ' As ' Bm' q q D s D m q q q mn max ' ( x ' u ') ' ( q ' q ' ) ( q ' q ' ) 1/2 max 1/2 mn ( AX BY ) ( AX BL) G G ( D x X D Y) u ( D x w X DuY ) X Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
37 BOP Optmzaton Problem s', m', q', XY,, mn g q ' s.t. s ' As ' Bm' q q D s D m q q q mn max ' ( x ' u ') ' ( q ' q ' ) ( q ' q ' ) 1/2 max 1/2 mn X A C C C C A AX BY ( AX BY ) X DxeDx ( ) Dx X DuY ( Dx X DuY ) X 1 e ( e v) e ( ) Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
38 cy (K) reg (K) F cat (kg/s) F ar (kg/s) Dynamcs of PSI versus FSI C (mass fracton) x 1-3 rgc O d (mass fracton x (K) st C st (mass fracton) Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
39 Outlne Fndng Q,R, and M weghts for MPC Effects of soft-constrants on mass sprng damper example FCC case study revsted Partal-state nformaton case Colored nose Effects of dsturbance model on CSR Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
40 feed s Dsturbance Model Shapng Flter.25.2 he dsturbance was modeled usng a shapng Flter. ypcal Profle tme x tme x 1 4 Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
41 F ar (kg/s) reg (K) F cat (kg/s) cy (K) Effects Colored Nose C rgc (mass fracton) O (mass fracton x 1-3 d Illnos Insttute of echnology x 1-3 Department of Chemcal and Bologcal Engneerng st (K) C st (mass fracton)
42 CSR example Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
43 Plant Constrants 3 Fn Fm.8m / s F F 1 35K 2 35K 33K n m c1, out.5m.5m / s / s 3K.3kmol m c2, out C A 2 / Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
44 Plant Proft Proft Functon: 1F C.1q q.1f.1f 2 B2 cool,1 cool,2 n m Assume U a cannot be measured PSI Kalman Flter used x = Ax + Bu + Gw y = Cx + v Where C s the output matrx and ν s the covarance of the sgnal nose ν Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
45 Dsturbances Consdered C w U U n A, n a1 a w Cases consdered U a = U a s consdered whte nose U a s hghly correlated colored nose Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
46 Feed Flow (m 3 /s) Jacket Flow 1 (m 3 /s) emperature from Jacket 2 (K) Reactor 2 emperature (K) Effect of Dsturbance Model No HEX Fault HEX Fault emperature from Jacket 1 (K) Reactor 1 emperature (K) Makeup Flow (m 3 /s) Jacket Flow 2 (m 3 /s) Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
47 Feed Flow (m 3 /s) Jacket Flow 1 (m 3 /s) emperature from Jacket 2 (K) Reactor 2 emperature (K) Effect of Dsturbance Model No HEX Fault HEX Fault Hghly Correlated Nose HEX Fault Whte Nose emperature from Jacket 1 (K) Reactor 1 emperature (K) Makeup Flow (m 3 /s) Jacket Flow 2 (m 3 /s) Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
48 CSR Proft Gross Proft ($/day) Dff from OSSOP ($/day) OSSOP $2,486 - U a = $2,342 - $144 Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
49 CSR Proft Gross Proft ($/day) Dff from OSSOP ($/day) OSSOP $2,486 - U a = $2,342 - $144 U a - whte nose $2,176 - $31 Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
50 CSR Proft Gross Proft ($/day) Dff from OSSOP ($/day) OSSOP $2,486 - U a = $2,342 - $144 U a - whte nose $2,176 - $31 U a slow varyng $2,115 - $371 Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
51 Conclusons Controller gan found n optmzaton s guaranteed to have some Q, R, and M. Burden on MPC soft-constrants shfted to controller tunng PSI case and colored nose can be extended to proft control Dsturbance model has sgnfcant mpacts on dynamcs and controller tunng Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
52 Acknowledgements Illnos Insttute of echnology s Department of Chemcal and Bologcal Engneerng Armour College of Engneerng and the II Graduate College Graduate Students Mke Walker Deepak Sharma Prevous Students Ju-Kun Peng Amt M. Manthanwar Illnos Insttute of echnology Department of Chemcal and Bologcal Engneerng
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