How Work Simulink

How to Use Simulink
ECE743
Jin-Woo Jung,
Ph. D. Student and GTA
Advisor: Prof. Ali Keyhani

January 21, 2005
Department of Electrical and Computer Engineering
The Ohio State University
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Features of Matlab and Simulink
Matlab (*.m):
Only text code (Not easy to model complicated systems)
Easy to edit figures

Simulink (*.mdl):
Schematic (Easy to model complicatedsystems)
Not easy to change parameters
Can not edit figures

Matlab (*.m) + Simulink (*.mdl): Best choice
Schematic: 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

Neural Network Blockset

Aerospace BlocksetReal-Time Windows Target

CDMA Reference Blockset

Real-Time Workshop

Communications Blockset

Report Generator

Control System Toolbox

S-function demos

DSP Blockset

SimMechanics

Gauges Blockset

SimPowerSystems

Embedded Target for Motorola MCP555

Simulink Extras

Embedded Target for TI C6000 DSP

System ID Toolbox

Fixed-Point Blockset

Virtual Reality ToolboxFuzzy Logic Toolbox

xPC Target

MPC Blocks
NCD Blockset

Stateflow

♦

: Available toolboxes at ECE Computer Lab.
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1. Current Directory
Click “Browser for folder”

1). Change “Current directory”

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2. Starting “Simulink”
1). Click “Simulink”

Then, Simulink Library Browser

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3. Open “A new file”
1). Click “Create anew 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”

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“Double click your model”

Click “Help” to set up parameters ECE743

4. Building “System” (2)
Find ‘’Block‘’ when you don’t know “block’s name”
1). Click“Simulink Help”

Then, type the text for model search

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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)
Set up “Simulation parameters”
Then, change “Stop time”

1). Click “Simulationparameters”

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6. Start “Simulation” (2)
Start Simulation
1). 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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7.Example 1
Four different Methods
Case 1: Only Matlab
Case 2: Matlab + Simulink: S-Function
1. S-function: “asglpr3b.m”
2. Simulink: “Example_1.mdl”
3. Plot: Plot_1.m

Case 3: Matlab + Simulink: Not S-Function
1. Parameter initialization: “Initialization.m”
2. Simulink: “Case_3.mdl”
3. Plot: Plot_1.m

Case 4: Matlab + Simulink: “SimPowerSystems”
1. Parameter initialization:“Para_Initial.m”
2. Simulink: “Case_4.mdl”
3. Plot: Plot_1.m
♦ “Note that all files should be under current directory”
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7. Example 1 − Case 1 – (1)
Case 1: Only Matlab – (1)
% Only Matlab code - Example 1 - Case 1
clear all
Lp = 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) -Mi0; -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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7. Example 1 − Case 1 – (2)
Case 1: Only Matlab – Matlab code continued - (2)
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;...