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

<p><b>Nick Jenkins, Cardiff University, UK</b><br />Nick is a Professor at the Cardiff School of Engineering. He is also the Director of the Centre for Integrated Renewable Energy Generation and Supply (CIREGS) at Cardiff University and is a special advisor to a House of Commons Select Committee (Innovation, Universities and Skills) in regard to their enquiries into Renewable Energy-Generation Technologies. He has set the Engineering Council examination on Power Systems for ten years.</p> <p><b>Goran Strbac, Imperial College, London, UK</b><br />Goran is Professor of Electrical Energy Systems at Imperial College, London. He is also the Director of the DTI Centre for Distributed Generation and Sustainable Electrical Energy, the Convener of CIGRE International Working Group on Economics of Integration of Distributed Generation and a member of the Executive Team of the IEE Professional Network on Power Trading and Control. He is a co-author of 3 books and has published more than 100 scientific papers.</p>

Electric power systems are going through a period of dramatic change with the need to reduce environmental impact, provide a secure supply of power to an increasing world population while aging infrastructure and equipment in many established systems needs replacing. Today's student has to understand both the large amount of plant and equipment that is in use as well as the possibilities offered by new technologies.<br /><br />Now comprehensively updated and revised, the fifth edition of this classic textbook provides a modern foundation in power systems engineering. The emphasis on practical analysis, modeling and fundamental principles, so successful in previous editions, is retained together with broad coverage of the subject while avoiding complex mathematics. Throughout, the worked examples and computer simulations used to explain concepts and calculation techniques have been modernised, as have all figures.<br /><br />Features of the fifth edition:<br /> <ul> <li>Examples of the use of power system simulation programs illustrating fundamental principles</li> <li>Revised chapters on load flow, systems stability and electrical transients</li> <li>Extended coverage of developments in HVDC including the use of voltage source converters</li> <li>A new chapter on power system economics</li> <li>Examination of substations and Gas Insulated Switchgear</li> <li>Extensive worked examples and end-of-chapter problems to facilitate learning</li> </ul> For instructors and teachers, solutions to the problems set out in the book can be found on the companion website.<br /><br />Offering enhanced, clear and concise explanation of practical applications, this updated edition will ensure that <i>Electric Power Systems</i> continues to be an invaluable resource for senior undergraduates in electrical engineering.

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