Matlab Simulink Tutorial For Beginners Pdf 15
Joyce Buzard
MATLAB (Matrix Laboratory) is a programming language developed by a computer software company MathWorks. Simulink is a simulation and model-based design environment for dynamic and embedded systems, which are integrated with MATLAB. Simulink is also developed by MathWorks. This tutorial is designed to give students fluency in MATLAB Simulink. Problem-based examples have also been given in simple and easy way to make your learning fast and effective.
This tutorial has been prepared for the beginners to help them understand basic to advanced functionality of MATLAB Simulink. After completing this tutorial you will find yourself at a moderate level of expertise in using Simulink from where you can take yourself to next levels.
We assume you have a little knowledge of any computer programming and understand concepts like variables, constants, expression, statements, etc. If you have done programming in any other high-level programming language like C, C++ or Java, then it will be very much beneficial and learning MATLAB Simulink will be like a fun for you.
MATLAB tutorial is prepared for complete beginners to MATLAB. Our MATLAB tutorial provides excellent insight into the core fundamentals of MATLAB. By learning the core concepts of MATLAB, a core learner can go further to our advance MATLAB tutorial in the path of learning the MATLAB.
In this MATLAB tutorial, we will start with the MATLAB as an environment and keep on studying with the MATLAB programming language. We will cover entire topics of MATLAB journey; from downloading & installing of the MATLAB environment, to its features & capabilities, to the basics programming fundamentals, and to the advance object-orientation of the MATLAB programming language. We will cover the areas where MATLAB is being used and what are its prospects. We will show you the strength of MATLAB in numerical computing, as to how MATLAB is so powerful in computing, plotting, algorithmic designs, and manipulating data. We will see MATLAB's rich add on toolboxes that are used to build future-ready applications.
In electrical engineering, inverters are one of the basic circuits used and are mostly used in UPS (uninterrupted power supply), which is present in almost every house now. Hence, the basic purpose of an inverter is to convert direct current (DC) to alternating current (AC), which is no doubt the opposite of rectifiers. So, for beginners, the definition of AC voltage can be taken as the voltage that changes its direction from positive voltage to negative voltage across the same terminal in a specified period of time over and over again. A simple sinusoidal wave is an AC wave. However, DC can be defined as a constant source of voltage that remains either positive or negative over time.
A single phase inverter is the type of inverter in which only one DC source is used, and the output thus formed is a single phase AC waveform. In the circuit, a bridge-like circuit comprised of IGBT transistors is used, which converts DC to AC.
Alternatively, a three phase inverter uses two input DC sources and 6 IGBT transistors to convert DC voltage into AC voltage, and the output of such a circuit will be a three phase AC waveform with a phase difference of 120. In the explanation below, we will design a three phase inverter in Simulink.
This block contains the definition of all the power blocks used in Simulink and acts like a startup file for the model. Now in the fundamental blocks section, go to the sources section, as shown in the figure below.
To provide pulses to the thyristor, we also need to place pulse generators on the model. In the library browser, search for the pulse generator in the search bar and add the pulse generator to the model as shown in the figure below.
We need a different pulse generator for each of the thyristors; hence, place six different pulse generators for every thyristor. Now for the output side, select the measurement block in the fundamental blocks section, and in this section, select the block named voltage measurement, as shown in the figure below. As we are working with a 3-phase inverter, we need to place three such measuring devices.
Also, we have to place the load to observe the output of the inverter using the fundamental blocks section. So, now select the block with the name elements, and in this section, select the series RLC branch and place it in the model. Refer to the figure below.
At the input side of the bridge we created previously, connect the DC voltage source, and at the output, connect the load (change the RLC load to only a resistive load) with each branch to each row as shown in the figure below.
Arrange all six pulse generators with each of the thyristors and connect them. The phase shift of the first pulse generator will be 0 degrees, whereas the second pulse generator will be 60 degrees, and so on. The parameter settings of the first block are shown in the figure below.
In conclusion, this tutorial provides an in-depth overview of designing and simulating three phase inverter using Simulink. It covers step-by-step procedures along with exaplanations of an example to help us better understand the concept. You can utilize this tutorial to design other three phase inverters. At the end, we have provided an exercise to reinforce the concept of phase inverters. Hopefully, this was helpful in expanding your knowledge of Simulink.
Tried this exact circuit, do not know what I am doing wrong but I do not get the same three phase waveforms at all. I have used the correct switching pulses and checked the waveforms but the output voltages are not right at all.
In electrical engineering, the rectifier is one of the most simple circuits. The basic purpose of a rectifier is to convert alternating current (AC) to direct current (DC). For beginners, the definition of AC voltage can be taken as the voltage that changes its direction from positive voltage to negative voltage across the same terminal in a specified period of time over and over again. A simple sinusoidal wave is an AC wave. However, DC can be defined as a constant source of voltage that remains either positive or negative over time.
A half wave rectifier only rectifies (converts to DC) the positive part of the AC voltage and skips the negative part. This rectifier is rarely used in common practice because of the loss of power due to the wastage of the negative part.
A full wave rectifier, however, uses both the positive and negative parts of the AC wave to rectify. It will pass the positive wave as it is and will invert the negative part of the wave to appear positive on the load with the help of a bridge, as we will see shortly. Along with some filters to remove ripples, we can get a perfect DC wave at the output. Due to less power loss and a closer resemblance to DC, this circuit is used more frequently compared to the former one.
Place four such diodes. Those who are familiar with rectifiers must know that in a full wave rectifier, there is a bridge of diodes. This bridge is made up of four diodes; hence, place four such diodes. Place two pairs of diodes in series, then connect these two pairs in parallel as shown in the figure below.
Place two such voltmeters on the model. Connect one of the voltmeters across the load resistor, as we are basically interested in measuring and viewing the voltage waveform at the load resistor. Refer to the figure to see how to connect the voltmeter to the load.
Also, we need a reference waveform to compare the output at the load with. Therefore, we will also measure the voltage at the input by connecting a voltmeter across the input AC source, as shown in the figure below.
Place the block on the model near the load. We want to view two waveforms, one of the input and the other of the output. Therefore, we need two input ports in scope. Change the number of input ports in the scope to two, as we have done in previous tutorials (refer to the RLC tutorial). At the two input ports, connect the input voltmeter and the output load voltmeter, as shown in the figure below.
Run the model by pressing the run button and then double-clicking on the scope. We want to see the legends on the waveform displayed by scope; hence, click on the view button and check the legends label as shown in the figure below.
In conclusion, this tutorial provides an in-depth overview of designing and simulating a full wave rectifier in Simulink. It covers step-by-step procedures along with explanations of an example to help us better understand the concept. You can utilize this concept to design and simulate a half wave rectifier as well. At the end, we provide an exercise to reinforce the concept of this tutorial. Hopefully, this was helpful in expanding your knowledge of Simulink.
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