Computer- Aided Design in Power Engineering Application of Software
This textbooks demonstrates the application of software tools in solving a series of problems from the field of designing power system structures and systems. It contains four chapters: The first chapter leads the reader through all the phases necessary i
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For Danica, Tatjana, Dušan and Lea
CONTENTS
PREFACE
11
ACKNOWLEDGMENT
17
1. COMPUTER-AIDED MODELING AND SIMULATION 19 1.1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 19 1.2. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . 19 1.3. Categories of approaches to modeling . . . . . . . . . . . 19 1.4. Phases of development . . . . . . . . . . . . . . . . . . . 20 1.5. The role of computers in modeling and simulation . . . . 21 1.6. Methodology of computer-aided modeling and simulation 21 1.6.1. Formulation of the problem . . . . . . . . . . . . . 21 1.6.2. Analysis of the problem . . . . . . . . . . . . . . . 23 1.6.3. Forming the mathematical model . . . . . . . . . . 24 1.6.3.1 General considerations . . . . . . . . . . . . 24 1.6.3.2 General principles of good modeling . . . . 36 1.6.4. Selection of computerized methods . . . . . . . . . 49 1.6.5. Forming the program . . . . . . . . . . . . . . . . . 50 1.6.5.1 Development of the algorithm . . . . . . . . 51 1.6.5.2 Requirements for resources . . . . . . . . . . 54 1.6.5.3 Program characteristics . . . . . . . . . . . 54 1.6.6. Simulation . . . . . . . . . . . . . . . . . . . . . . . 86 1.6.6.1 Aspects of performing simulation . . . . . . 86 1.6.6.2 Advantages of simulation . . . . . . . . . . 98 1.7. Supplement: GIC – software tool for calculating the grounding grid impulse characteristics . . . . . . . . . . . . . . . 99 1.7.1. Purpose of the program . . . . . . . . . . . . . . . 99 1.7.2. Mathematical model of a grounding grid in an impulse regime . . . . . . . . . . . . . . . . . . . . 100 1.7.3. Sequence of calculation . . . . . . . . . . . . . . . . 100 1.7.4. Description of the software . . . . . . . . . . . . . . 101 1.7.4.1 Defining the parameters for calculating grounding grid impulse characteristics . . . 102
CONTENTS
6
1.7.4.2 Executing the calculation . . . . . . . . . 1.7.4.3 Display of calculation results . . . . . . . 1.7.5. Calculation examples . . . . . . . . . . . . . . . . 1.7.6. Input-output values and possible errors . . . . . . 1.7.6.1 Input-output variables . . . . . . . . . . . 1.7.6.2 Possible Errors . . . . . . . . . . . . . . . 1.7.6.3 Messages when working with the software tool GIC . . . . . . . . . . . . . . . . . . . 1.7.7. Using windows commands . . . . . . . . . . . . . 1.7.7.1 Opening the program . . . . . . . . . . . . 1.7.7.2 Appearance of screen with windows commands . . . . . . . . . . . . . . . . . . . . 1.7.7.3 Description of individual commands using the help menu . . . . . . . . . . . . . . . . LITERATURE
. . . . . .
106 106 108 113 113 114
. 116 . 117 . 117 . 117 . 117 130
2. APPLICATION OF SOFTWARE TOOLS IN POWER ENGINEERING CALCULATIONS 135 2.1. MATLAB /Simulink . . . . . . . . . . . . . . . . . . . 135 2.1.1. Introduction . . . . . . . . . . . . . . . . . . . . . . 135 2.1.2. Basic groups of blocks in Simulink software∗ . . . 138 ∗ 2.1.3. Additional module SimPowerSystemsTM . . . . . . 142 2.1.4. Application of MATLAB technical computing software in calculation o
