source: branches/gui/sample/controllers/Sample_flash_pid.mso @ 714

#*-------------------------------------------------------------------
* EMSO Model Library (EML) Copyright (C) 2004 - 2008 ALSOC.
*
* This LIBRARY is free software; you can distribute it and/or modify
* it under the therms of the ALSOC FREE LICENSE as available at
* http://www.enq.ufrgs.br/alsoc.
*
* EMSO Copyright (C) 2004 - 2008 ALSOC, original code
* from http://www.rps.eng.br Copyright (C) 2002-2004.
* All rights reserved.
*
* EMSO is distributed under the therms of the ALSOC LICENSE as
* available at http://www.enq.ufrgs.br/alsoc.
*
*--------------------------------------------------------------------
* Flash separator sample file.
*--------------------------------------------------------------------
*
* This sample file needs VRTherm (www.vrtech.com.br) to run.
*
*--------------------------------------------------------------------
* Author: Rafael de Pelegrini Soares
* $Id: Sample_flash_pid.mso 578 2008-07-25 22:24:26Z bicca $
*------------------------------------------------------------------*#

using "stage_separators/flash";
using "controllers/PIDIncr";

FlowSheet Flash_Dynamic
        
        PARAMETERS
        PP      as Plugin(Brief="Physical Properties",Type="PP",
                Components = ["n-butane", "benzene", "n-octane"],
                LiquidModel = "PR",
                VapourModel = "PR");
        NComp   as Integer;
        #Maximum and minimum vapor and liquid flow rates
        FVMin as flow_mol;
        FVMax as flow_mol;
        FLMax as flow_mol;
        FLMin as flow_mol;
        #Maximum and minimum pressure
        PMin as pressure;
        PMax as pressure;
        #Maximum and minimum level
        LMax as length;
        LMin as length;

        VARIABLES
        L_ad as Real (Brief="Dimensionless level");
        P_ad as Real (Brief="Dimensionless pressure");
        Q       as energy_source (Brief="Heat supplied");
        
        DEVICES
        pidL as PIDIncr; #Level controller
        pidP as PIDIncr; #Pressure controller
        fl as flash;
        s1 as source;
        
        SET
        NComp = PP.NumberOfComponents;
        
        pidL.PID_Select = "Parallel_AWBT";
        pidP.PID_Select = "Parallel_AWBT";
        
        #Flash model parameters
        fl.V = 10 * 'm^3';
        fl.diameter = 0.5 * 'm';
        fl.orientation = "vertical";
        
        #Maximum and minimum values
        PMax=2.36 *'atm';
        PMin=0 *'atm';
        LMax=2 *'m';
        LMin=0 *'m';
        FVMax=300*'kmol/h';
        FVMin=0*'kmol/h';
        FLMax=692.7*'kmol/h';
        FLMin=0*'kmol/h';

        CONNECTIONS
        s1.Outlet to fl.Inlet;
        Q.OutletQ to fl.InletQ;

        SET
        #Level controller configuration
        pidL.bias=0.5;
        pidL.gain=1.1776;
        pidL.derivTime=19*'s';
        pidL.intTime=76*'s';
        pidL.tau=1*'s';
        pidL.tauSet=1*'s';
        pidL.alpha =1;
        pidL.beta =1;
    pidL.gamma =1;
        pidL.Mode = "Automatic";
        pidL.Clip = "Clipped";
        pidL.Action = "Direct";
        
        #Pressure controller parameters
        pidP.bias=0.5;  
        pidP.gain=0.9275;
        pidP.derivTime=18*'s';
        pidP.intTime=72*'s';
        pidP.tau=1*'s';
        pidP.tauSet=1*'s';
        pidP.alpha =1;
        pidP.beta =1;
        pidP.gamma =1;
        #Pressure controller configuration
        pidP.Mode = "Automatic";                
        pidP.Clip = "Clipped";
        pidP.Action = "Direct";

        SPECIFY

        Q.OutletQ = 1026.32 * 'kJ/s';

        #Level controller parameters
        pidL.Ports.setPoint=0.5;


        EQUATIONS
        #Feed stream
        s1.Composition = [0.3, 0.3, 0.4];       
        s1.P = 5 * 'atm';       
        
        #Disturbance
        if time < 0.5*'h' then
                s1.T = 338 * 'K';
                s1.F = 496.3 * 'kmol/h';
        else
                s1.T = 360 * 'K';
                s1.F = 450 * 'kmol/h';
        end

        #Control variables: fl.Level and fl.OutletV.P
        #Normalized control variables
        L_ad*(LMax-LMin)=fl.Level-LMin;
        P_ad*(PMax-PMin)=fl.OutletV.P-PMin;
        
        #Controllers input ports
        pidL.Ports.input=L_ad;
        pidP.Ports.input=P_ad;  
        
        #Setpoint change
        if time < 2*'h' then
                pidP.Ports.setPoint=0.501822;
        else
                pidP.Ports.setPoint=0.8474576;
        end     
        
        #Controllers output ports
        #Manipulated variables: fl.OutletV.F (pressure control) and fl.OutletL.F (level control)
        fl.OutletV.F = pidP.Ports.output*(FVMax-FVMin)+FVMin;
        fl.OutletL.F = pidL.Ports.output*(FLMax-FLMin)+FLMin;

        INITIAL
        fl.OutletL.T = 340 *'K';
        fl.Level = 1* 'm';
        fl.OutletL.z(1) = 0.1;
        fl.OutletL.z(2) = 0.1;

        OPTIONS
        TimeStep = 0.02;
        TimeEnd = 3;
        TimeUnit = 'h';
        DAESolver(File="dassl");
end