%Book Title: Practical Design and Application of Linear MPC
%Chapter: 8
%Section: 4
%Authors: Nassim Khaled and Bibin Pattel
%Last Modified: 1/16/2018
close all
%% System Identification of PV Cell
%% Simulate the model
sim('Chapter_8_Section_4_Model')
%% Create time vector
Time=0:1:length(Lambda_UV)-1;
%% Change plotting settings
set(0,'DefaultLineLineWidth',1)
set(0,'DefaultAxesFontWeight','bold')
set(0,'DefaultAxesFontName','Arial')
set(0,'DefaultAxesFontSize',12)
%% Grouping simulation data and neglecting first few seconds(Nstart*stp_sz)
Nstart =2000; %Clip the data starting from Nstart as the first few seconds of the simulation should be discarded
Measured_Outputs=[ Tm_f(Nstart:end)]; %Measured outputs
Manipipulated_Variables=[ Lambda_UV(Nstart:end) ];% Pout_previous ]; %Manipulated variables
%% Obtaining initial conditions at step time=Nstart
Measured_Outputs_Nstart=Measured_Outputs(1,:); %Capturing the measured outputs at step time= Nstart
Manipipulated_Variables_Nstart=Manipipulated_Variables(1,:); %Capturing the manipulated variables at step time= Nstart
%% Forcing response to start from zero initial conditions
Measured_Outputs_zero_initial_conditions=Measured_Outputs(1:end,:)-repmat(Measured_Outputs_Nstart,length(Measured_Outputs(1:end,:)),1); %Subtracting initial conditions for measured outputs to obtain zero response at step time= Nstart
Manipipulated_Variables_zero_initial_conditions=Manipipulated_Variables(1:end,:)-repmat(Manipipulated_Variables_Nstart,length(Manipipulated_Variables(1:end,:)),1); %Subtracting initial conditions for manipulated variables to obtain zero actuation at step time= Nstart
%% Prepare date for system identification
stp_sz=10
data=iddata(Measured_Outputs_zero_initial_conditions(1:stp_sz:end,:),Manipipulated_Variables_zero_initial_conditions(1:stp_sz:end,:),stp_sz); %data is packaged for system identification using iddata
%% Generate a preliminary 3rd order system that fits the data
sys1=n4sid(data,3,'Form','canonical','DisturbanceModel','None','InputDelay',[0 ]','InitialState','zero'); %n4sid generates a preliminary system in the canonical form
%% Generate a more refined system
sys2 = pem(data,sys1,'InitialState','zero') %pem generates a more refined system that fits the data better
%% Define the options for comparing the various identified systems
opt = compareOptions('InitialCondition','Z');
%% Plot the comparison between the simulation data and the identified system sys2
figure
compare(data,sys2,opt);
%% Extract A, B, C and D matrices from sys2
A=sys2.A
B=sys2.B
C=sys2.C
D=sys2.D
%% Use the ss command to represent the results from sys2 in a state space format
PV_Linear_Model = ss(A,B,C,D,stp_sz)
save Chapter_8_Section_4_Linear_Model.mat PV_Linear_Model
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一个太阳能电池的模型预测控制设计,适合模型预测学习的人参考学习交流。 A solar cell model predictive control design, suitable for model predictive learning people reference learning communication
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