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Electric Power Systems 5e
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The definitive textbook for Power Systems students, providing a grounding in essential power system theory while also focusing on practical power engineering applications. Electric Power Systems has been an essential book in power systems engineering for over thirty years. Bringing the content firmly up-to-date whilst still retaining the flavour of Weedy's extremely popular original, this Fifth Edition has been revised by experts Nick Jenkins, Janaka Ekanayake and Goran Strbac. This wide-ranging text still covers all of the fundamental power systems subjects but is now expanded to cover increasingly important topics like climate change and renewable power generation. Updated material includes an analysis of today's markets and an examination of the current economic state of power generation. The physical limits of power systems equipment - currently being tested by the huge demand for power - is explored, and greater attention is paid to power electronics, voltage source and power system components, amongst a host of other updates and revisions. Supplies an updated chapter on power system economics and management issues and extended coverage of power system components. Also expanded information on power electronics and voltage source, including VSC HVDC and FACTS. Updated to take into account the challenges posed by different world markets, and pays greater attention to up-to-date renewable power generation methods such as wind power. Includes modernized presentation and greater use of examples to appeal to today's students, also retains the end of chapter questions to assist with the learning process. Also shows students how to apply calculation techniques.
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Table of Contents

Preface to First Edition ix Preface to Fourth Edition xi Preface to Fifth Edition xiii Symbols xv 1 Introduction 1 1.1 History 1 1.2 Characteristics Influencing Generation and Transmission 2 1.3 Operation of Generators 4 1.4 Energy Conversion 5 1.5 Renewable Energy Sources 12 1.6 Energy Storage 17 1.7 Environmental Aspects of Electrical Energy 23 1.8 Transmission and Distribution Systems 27 1.9 Utilization 40 Problems 43 2 Basic Concepts 45 2.1 Three-Phase Systems 45 2.2 Three-Phase Transformers 55 2.3 Active and Reactive Power 57 2.4 The Per-Unit System 61 2.5 Power Transfer and Reactive Power 68 2.6 Harmonics in Three-Phase Systems 74 2.7 Useful Network Theory 75 Problems 78 3 Components of a Power System 83 3.1 Introduction 83 3.2 Synchronous Machines 83 3.3 Equivalent Circuit Under Balanced Short-Circuit Conditions 90 3.4 Synchronous Generators in Parallel 94 3.5 The Operation of a Generator on an Infinite Busbar 95 3.6 Automatic Voltage Regulators (AVRs) 100 3.7 Lines, Cables and Transformers 103 3.8 Transformers 124 3.9 Voltage Characteristics of Loads 131 Problems 134 4 Control of Power and Frequency 139 4.1 Introduction 139 4.2 The Turbine Governor 142 4.3 Control Loops 146 4.4 Division of Load between Generators 147 4.5 The Power-Frequency Characteristic of an Interconnected System 151 4.6 System Connected by Lines of Relatively Small Capacity 152 Problems 159 5 Control of Voltage and Reactive Power 161 5.1 Introduction 161 5.2 The Generation and Absorption of Reactive Power 163 5.3 Relation between Voltage, Power, and Reactive Power at a Node 165 5.4 Methods of Voltage Control: (a) Injection of Reactive Power 170 5.5 Methods of Voltage Control: (b) Tap-Changing Transformers 176 5.6 Combined Use of Tap-Changing Transformers and Reactive-Power Injection 183 5.7 Phase-Shift Transformer 188 5.8 Voltage Collapse 191 5.9 Voltage Control in Distribution Networks 195 5.10 Long Lines 197 5.11 General System Considerations 198 Problems 200 6 Load Flows 205 6.1 Introduction 205 6.2 Circuit Analysis Versus Load Flow Analysis 206 6.3 Gauss-Seidel Method 212 6.4 Load Flows in Radial and Simple Loop Networks 216 6.5 Load Flows in Large Systems 219 6.6 Computer Simulations 231 Problems 234 7 Fault Analysis 239 7.1 Introduction 239 7.2 Calculation of Three-Phase Balanced Fault Currents 241 7.3 Method of Symmetrical Components 247 7.4 Representation of Plant in the Phase-Sequence Networks 251 7.5 Types of Fault 252 7.6 Fault Levels in a Typical System 259 7.7 Power in Symmetrical Components 265 7.8 Systematic Methods for Fault Analysis in Large Networks 265 7.9 Neutral Grounding 270 7.10 Interference with Communication Circuits Electromagnetic Compatibility (EMC) 274 Problems 275 8 System Stability 281 8.1 Introduction 281 8.2 Equation of Motion of a Rotating Machine 283 8.3 Steady-State Stability 284 8.4 Transient Stability 287 8.5 Transient Stability Consideration of Time 293 8.6 Transient Stability Calculations by Computer 298 8.7 Dynamic or Small-Signal Stability 301 8.8 Stability of Loads Leading to Voltage Collapse 305 8.9 Further Aspects 309 8.10 Multi-Machine Systems 311 8.11 Transient Energy Functions (TEF) 312 8.12 Improvement of System Stability 314 Problems 315 9 Direct-Current Transmission 319 9.1 Introduction 319 9.2 Current Source and Voltage Source Converters 320 9.3 Semiconductor Valves for High-Voltage Direct-Current Converters 322 9.4 Current Source Converter h.v.d.c. 325 9.5 Voltage Source Converter h.v.d.c. 346 Problems 352 10 Overvoltages and Insulation Requirements 355 10.1 Introduction 355 10.2 Generation of Overvoltages 356 10.3 Protection Against Overvoltages 365 10.4 Insulation Coordination 369 10.5 Propagation of Surges 373 10.6 Determination of System Voltages Produced by Travelling Surges 382 10.7 Electromagnetic Transient Program (EMTP) 391 Problems 399 11 Substations and Protection 403 11.1 Introduction 403 11.2 Switchgear 404 11.3 Qualities Required of Protection 415 11.4 Components of Protective Schemes 416 11.5 Protection Systems 424 11.6 Distance Protection 427 11.7 Unit Protection Schemes 429 11.8 Generator Protection 430 11.9 Transformer Protection 432 11.10 Feeder Protection 435 Problems 439 12 Fundamentals of the Economics of Operation and Planning of Electricity Systems 443 12.1 Economic Operation of Generation Systems 444 12.2 Fundamental Principles of Generation System Planning 451 12.3 Economic Operation of Transmission Systems 457 12.4 Fundamental Principles of Transmission System Planning 460 12.5 Distribution and Transmission Network Security Considerations 463 12.6 Drivers for Change 466 Problems 467 Appendix A Synchronous Machine Reactances 473 Appendix B Typical Transformer Impedances 477 Appendix C Typical Overhead Line Parameters 481 Further Reading 487 Index 491

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