how to use simulink - cs department - homeczou/cda6530-10/matlab/how to use simulink.pdf ·...
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How to Use Simulink
Jin-Woo Jung,Ph. D. Student and GTA
Advisor: Prof. Ali Keyhani
January 21, 2005
Department of Electrical and Computer EngineeringThe Ohio State University
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Features of Matlab and Simulink
Matlab (*.m):
Simulink (*.mdl):Schematic (Easy to model complicated systems)
Not easy to change parameters
Only text code (Not easy to model complicated systems)Easy to edit figures
Can not edit figures
Matlab (*.m) + Simulink (*.mdl): Best choiceSchematic: Simulink
Easy to change parameters: Matlab (m file for parameter initialization)
Edit figures: Simulink (“To Workspace”) ⇒ Matlab (m file for plot)
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Available Simulink Toolboxes (version. 6.5)
Simulink
Control System Toolbox
Fuzzy Logic Toolbox
Embedded Target for Motorola MCP555
Gauges Blockset
Aerospace Blockset
CDMA Reference Blockset
Communications Blockset
DSP Blockset
Embedded Target for TI C6000 DSP
Fixed-Point Blockset
MPC Blocks
NCD Blockset
Neural Network BlocksetReal-Time Windows TargetReal-Time WorkshopReport GeneratorS-function demosSimMechanicsSimPowerSystemsSimulink ExtrasStateflowSystem ID ToolboxVirtual Reality ToolboxxPC Target
: Available toolboxes at ECE Computer Lab.♦3
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1. Current Directory
1). Change “Current directory” Click “Browser for folder”
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1). Click “Simulink”
2. Starting “Simulink”
Then, Simulink Library Browser
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3. Open “A new file”
1). Click “Create a new model”Then, a new Simulink file
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4. Building “System” (1)Find ‘’Block‘’ when you know “block’s name”1). Type block’s name and then drag it to a new file
“Press a right button on a mouse” “Double click your model”
Click “Help” to set up parameters7
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Find ‘’Block‘’ when you don’t know “block’s name”
4. Building “System” (2)
1). Click “Simulink Help” Then, type the text for model search This is model name
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5. Set up “Model properties”Set up m files for parameter initialization and plot (later)1). Click “Model properties” Then, type file names: Initialization.m and Plot.m
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6. Start “Simulation” (1)
1). Click “Simulation parameters”
Set up “Simulation parameters”Then, change “Stop time”
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6. Start “Simulation” (2)Start Simulation1). Click “Start simulation”
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7. Example for Matlab/Simulink
Example 1:
where: Lp = 0.1 H, Ls = 0.2 H, Rp = 1 Ω, Rs = 2 Ω, R1 = 1 Ω, Mi = 0.1 H, C = 1 µF, and V = 10 V (Step Input)
Simulate the dynamic response of i1, i2, and Vc and plot the results on the same page.
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1. S-function: “asglpr3b.m”2. Simulink: “Example_1.mdl”3. Plot: Plot_1.m
Case 1: Only Matlab
7. Example 1
♦ “Note that all files should be under current directory”
Four different Methods
Case 2: Matlab + Simulink: S-Function
Case 3: Matlab + Simulink: Not S-Function1. Parameter initialization: “Initialization.m”2. Simulink: “Case_3.mdl”3. Plot: Plot_1.m
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Case 4: Matlab + Simulink: “SimPowerSystems”1. Parameter initialization: “Para_Initial.m”2. Simulink: “Case_4.mdl”3. Plot: Plot_1.m
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7. Example 1 − Case 1 – (1)
Case 1: Only Matlab – (1)
% Only Matlab code - Example 1 - Case 1
clear allLp = 0.1;Ls = 0.2;Mi = 0.1;Rp = 1;Rs = 2;R1 = 1;C = 1e-6;V = 10;alpha = 0.1;
R = [-Rp 0 0; 0 -(Rs+R1) -1; 0 1 0]D = [1;0;0]L = [(Lp+Mi) -Mi 0; -Mi (Ls+Mi) 0; 0 0 C]Linv = inv(L);
A = Linv*R;B = Linv*D;
X = [0;0;0];U = V;
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T = 0.0001; % time step
for n = 1:10000% Trapezoidal Integration
n1(n) = n;Xest = X + T*(A*X + B*U);Xdotest = A*Xest + B*U;alpha1 = 1 + alpha;alpha2 = 1 - alpha;term1 = alpha1*Xdotest;termint = A*X + B*U;term2 = alpha2 + termint;
X = X + (T/2)*(term1 + term2);
i1(n) = X(1);i2(n) = X(2);Vc(n) = X(3);
end
7. Example 1 − Case 1 – (2)
Case 1: Only Matlab – Matlab code continued - (2)
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figure (1)subplot(3,1,1)plot(n1*T,i1)gridylabel('i_1 [A]')title('i_1 vs time')
subplot(3,1,2)plot(n1*T,i2)gridaxis([0 1 -0.01 0.01])ylabel('i_2 [A]')title('i_2 vs time')
subplot(3,1,3)plot(n1*T,Vc)gridaxis([0 1 -5 10])xlabel('Time')ylabel('V_c [V]')title('V_c vs time')
7. Example 1 − Case 1 – (3)
Case 1: Only Matlab – Matlab code continued - (3)
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0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
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10
i 1 [A
]
i1 vs time
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1-0.01
-0.005
0
0.005
0.01
i 2 [A
]
i2 vs time
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1-5
0
5
10
Time
Vc
[V]
Vc vs time
7. Example 1 − Case 1 – (4)
Results
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Case 2: Matlab + Simulink: S-function
function [sys, x0]=prob1(t,x,u,flag)
Lp = 0.1;Ls = 0.2;Mi = 0.1;Rp = 1;Rs = 2;Rl = 1;C = 1e-6;V = 10;alpha = 0.1;R = [-Rp 0 0; 0 -(Rs+Rl) -1; 0 1 0]D = [1;0;0]L = [(Lp+Mi) -Mi 0; -Mi (Ls+Mi) 0; 0 0 C]Linv = inv(L);A = Linv*R;B = Linv*D;
7. Example 1 − Case 2 – (1)
S-function code: “asglpr3b.m” --- (1)
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if abs(flag)==1sys(1:3)=A*x(1:3)+B*u;
elseif abs(flag)==3sys(1:3)= x(1:3);
elseif flag==0sys(1)=3;sys(2)=0;sys(3)=3;sys(4)=1;sys(5)=0;sys(6)=0;
x0= [0; 0; 0];else
sys=[];end;
S-function code: “asglpr3b.m” --- Matlab code continued - (2)
7. Example 1 − Case 2 – (2)
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Simulink code: “Example_1.mdl” --- (1)
7. Example 1 − Case 2 – (3)
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Simulink code: “Example_1.mdl” --- (2)
1. “To Workspace”
“Type a variable name”Click “Array”
7. Example 1 − Case 2 – (4)
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Simulink code: “Example_1.mdl” --- (3)
2. “S-Function”
“Type S-function name”
“Blank”
7. Example 1 − Case 2 – (5)
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Simulink code: “Example_1.mdl” --- (4)
3. “Scope”
“Click Parameters”
“Type the number of axes”
Release “Limit data points to last”
7. Example 1 − Case 2 – (6)
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Plot Matlab code: “Plot_1.m” --- (Method1 for plot)
“Select the texts” and then“Press a right button on a mouse”
Click “Evaluate Selection”
7. Example 1 − Case 2 – (7)
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Plot Matlab code: “Plot_1.m” --- (Method 2 for plot)
Type “a file name for plot”
7. Example 1 − Case 2 – (8)
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0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
5
10
i 1 [A
]
i1 vs time
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1-0.01
-0.005
0
0.005
0.01
i 2 [A
]
i2 vs time
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1-5
0
5
10
Time
Vc
[V]
Vc vs time
Results
7. Example 1 − Case 2 – (9)
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7. Example 1 − Case 3 – (1)
Case 3: Matlab + Simulink: Not S-FunctionParameter Initialization: “Initialization.m” - (1)
% Parameters Initialization - Example 1 - Case 3clear allLp = 0.1;Ls = 0.2;Mi = 0.1;Rp = 1;Rs = 2;R1 = 1;C = 1e-6;V = 10;alpha = 0.1;
R = [-Rp 0 0; 0 -(Rs+R1) -1; 0 1 0]D = [1;0;0]L = [(Lp+Mi) -Mi 0; -Mi (Ls+Mi) 0; 0 0 C]Linv = inv(L);
A = Linv*R;B = Linv*D;C = eye(3);D = zeros(3,1);
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7. Example 1 − Case 3 – (2)
Simulink code: “Case_3.mdl” --- (1)
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Simulink code: “Case_3.mdl” --- (2)
7. Example 1 − Case 3 – (3)
1. “State-space”
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7. Example 1 − Case 3 – (4)Set up m files for parameter initialization and plot1). Click “Model properties” Then, type file names: Initialization.m and Plot_1.m
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0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
5
10
i 1
i1 vs time
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1-0.01
-0.005
0
0.005
0.01
i 2
i2 vs time
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1-5
0
5
10
Vc
Vc vs time
7. Example 1 − Case 3 – (5)
Results
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7. Example 1 − Case 4 – (1)
Case 4: Matlab + Simulink (SimPower Systems)Parameter Initialization: “Para_Initial.m”
% Parameters Initialization - Example 1 - Case 4
clear allV = 10;Lp = 0.1;Ls = 0.2;Mi = 0.1;Rp = 1;Rs = 2;R1 = 1;C = 1e-6;
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7. Example 1 − Case 4 – (2)
Simulink code: “Case_4.mdl”
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7. Example 1 − Case 4 – (3)Set up m files for parameter initialization and plot1). Click “Model properties” Then, type file names: Para_Initial.m and Plot_1.m
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1). Click “Simulation parameters”
Set up “Simulation parameters”
Then, change “Stop time” and “Solver options”
7. Example 1 − Case 4 – (4)
Then, reduce “Max step size”
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7. Example 1 − Case 4 – (5)
Results
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
5
10
i 1
i1 vs time
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1-0.01
-0.005
0
0.005
0.01
i 2
i2 vs time
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
5
10
Vc
Vc vs time
36