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 flavor of Weedy's extremely popular original, this Fifth Edition has been revised by experts Goran Strbac and Nick Jenkins. 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

Contents
1 Introduction



· Characteristics Influencing Generation and Transmission

· Operation of Generators

· Energy Conversion

· Renewable Energy Sources

· Energy Storage

· Environmental Aspects of Electrical Energy

· Transmission and Distribution Systems



2 Basic Concepts



• Three-Phase Systems

• Three-Phase Transformers

• Active and Reactive Power

• The Per-Unit System

• Power Transfer and Reactive Power

• Harmonics in Three-Phase Systems

• Useful Network Theory



3 Components of a Power System



• Synchronous Machines

• Equivalent Circuit Under Balanced Short-Circuit Conditions

• Synchronous Generators in Parallel

• The Operation of a Generator on Infinite Busbars

• Automatic Voltage Regulators (AVRs)

• Lines, Cables, and Transformers

• Transformers

• Voltage Characteristics of Loads



4 Controls of Power and Frequency



• The Turbine Governor

• Control Loops

• Division of Load between Generators

• The Power-Frequency Characteristic of an Interconnected System

• System Connected by Lines of Relatively Small Capacity



5, Control of Voltage and Reactive Power



• The Generation and Absorption of Reactive Power

• Relation between Voltage, Power, and Reactive Power at a Node

• Methods of Voltage Control:

• Methods of Voltage Control:

• Combined Use of Tap-Changing Transformers and Reactive-Power Injection

• Phase shift transformer

• Voltage Collapse

• Voltage Control in Distribution Networks

• Long Lines

• General System Considerations



6 Load Flows



• Circuit analysis versus load flow analysis

• Gauss Siedal method

• Load flows in radial and simple loop networks

• Load flows in Large Systems

• Example of a Complex Load Flow

• Computer simulations



7 Fault Analyses



• Calculation of Three-Phase Balanced Fault Currents

• Method of Symmetrical Components

• Representation of Plant in the Phase-Sequence Networks

• Types of Fault

• Fault Levels in a Typical System

• Power in Symmetrical Components

• Systematic Methods for Fault Analysis in Large Networks

• Neutral Grounding

• Interference with Communication Circuits--Electromagnetic

• Compatibility (EMC)



8 System Stability



• Equation of Motion of a Rotating Machine

• Steady-State Stability

• Transient Stability

• Transient Stability--Consideration of Time

• Transient Stability Calculations by Computer

• Dynamic or small signal stability

• Stability of Loads Leading to Voltage Collapse

• Further Aspects

• Multimachine Systems

• Energy-Type Functions

• Improvement of stability



9 Direct-Current Transmission



• Current Source and Voltage Source Converters

• Semi-conductor Valves for High Voltage DC Converters

• Current Source h.v.d.c.

• Voltage Source h.v.d.c.



10 Over voltages and Insulation Requirements



• Generation of over voltages

• Protection Against Over voltages

• Insulation Coordination

• Propagation of Surges

• Determination of System Voltages Produced by Travelling Surges

• Electromagnetic Transient Program (EMTP)



11 Substations and Protection



• Switchgear

• Qualities Required of Protection

• Components of Protective Schemes

• Protection Systems

• Distance Protection

• Unit Protection Schemes

• Generator Protection

• Transformer Protection

• Feeder Protection

• System Monitoring and Control

• System Security and Emergency Control



12 Fundamentals of the Economics of Operation and Planning of Electricity Systems



• Economic Operation of Generation Systems

• Fundamental principles of Generation System Planning

• Economic Operation of Transmission Systems

• Fundamental principles of Transmission System Planning

• Distribution and Transmission Network security considerations

• Drivers for change