Quality of power supply is now a major issue worldwide making harmonic analysis an essential element in power system planning and design. Power System Harmonic Analysis presents novel analytical and modelling tools for the assessment of components and systems, and their interactions at harmonic frequencies. The recent proliferation of power electronic equipment is a significant source of harmonic distortion and the authors present effective techniques to tackle this real engineering problem. Features include:

• Introduction to the main harmonic modelling philosophies
• Analysis of the behaviour of harmonic sources, stressing the interaction of ac/dc converters with the power system
• Information showing the reader how to predict accurately the levels of voltage and current harmonics throughout the power system
• Explanation of the techniques currently used for the prediction of harmonic content and the more advanced algorithms recently developed to determine both characteristic and uncharacteristic harmonic levels
• Description of methods to facilitate accurate assessment of harmonic sources and precise harmonic flow analysis
• Practical guidance on the prediction of unstable conditions and uncharacteristic harmonics

The changing structure of the electric utility industry has had a significant impact on power system design and operation. In particular, the incorporation of flexible a.c. transmission system (FACTS) devices and high voltage direct current (HVDC) links into conventional computational programs presents new challenges in power system modelling. Responding to these changes, Computer Modelling of Electrical Power Systems, Second Edition presents modern analysis tools for the design and improvement of power system performance.
This fully revised and updated edition features:

• The incorporation of HVDC and FACTS devices in power flow and system stability with detailed descriptions of the relevant algorithms.
• Extensive coverage of the EMTP (electromagnetic transient program) method - a key development in power system simulation.
• The use and impact of personal computers in power system simulation, with emphasis on efficient computational techniques for interactive work.

In this book the authors describe the main computer modelling techniques that, having gained universal acceptance, constitute the basic framework of modern power system analysis. Some basic knowledge of power system theory, matrix analysis and numerical techniques is presumed, although several appendices and many references have been included to help the uninitiated to pick up the relevant background. An introductory chapter describes the main computational and transmission system developments which influence modern power system analysis. This is followed by three chapters on the subject of load or power flow with emphasis on the Newton-Raphson fast-decoupled algorithm. Chapter 5 describes the subject of a.c. system faults. The next two chapters deal with the electromechanical behaviour of power systems. Chapter 6 describes the basic dynamic models of power system plant and their use in multi-machine transient stability analysis. More advanced dynamic models and a quasi-steady-state representation of large converter plant and h.v.d.c. transmission are developed in Chapter 7. A description of the Electromagnetic Transients Program with the marriage between "Bergeron's and Trapezoidal" methods is presented in Chapter 8, and a generalization of the multi-phase models described in Chapter 3 is used in Chapter 9 as the framework for harmonic flow analysis. Chapter 10 describes the state of the art in power system security and optimization analysis. Finally, Chapter 11 deals with recent advances made on the subject of interactive power system analysis and developments in computer graphics with emphasis on the use of personal computers.

The development of power semiconductors with greater ratings and improved characteristics has meant that the power industry has become more willing to develop new converter configurations. These new configurations take advantage of the higher controllability and switching frequencies of the new devices. The next few years will decide which of the proposed technologies will dominate future power transmission systems.

Flexible Power Transmission is a comprehensive guide to the high voltage direct current (HVDC) options available, helping the reader to make informed decisions for designing future power transmission systems. The book includes:

An excellent reference for professional power engineers, Flexible Power Transmission is also a useful guide for power system researchers as well as lecturers and students in power systems and power electronics disciplines.

a full description of the principles and components in existing converter technology, as well as alternative proposals for self-commutating conversion; A review of the state of power semiconductors suited to HVDC transmission and present proposals for multi-level HVDC transmission.

a detailed overview of the flexible HVDC methods for improving controllability and increasing power transfer capability in electrical power systems.

up-to-date information on thyrisistor-based HVDC technology.

coverage of new pulse width modulation (PWM) transmission technology and multi-level voltage source conversion (VSC) and current source conversion (CSC).

Harmonic distortion problems include equipment overheating, motor failures, capacitor failure and inaccurate power metering. The topic of power system harmonics was covered for the first time 20 years ago and the first edition has become a standard reference work in this area. Unprecedented developments in power electronic devices and their integration at all levels in the power system require a new look at the causes and effects of these problems, and the state of hardware and software available for harmonic assessment.

Following the successful first edition, this second edition of "Power System Harmonics" maintains the practical approach to the subject and discusses the impact of advanced power electronic technology on instrumentation, simulation, standards and active harmonic elimination techniques.

Features include: A new chapter on modern digital instrumentation techniques. Added sections on active filters and modern distorting devices such as FACTS devices, multilevel conversion, current source, voltage source inverters and turn-OFF-related power electronic devices. References to international standards for harmonics and inter-harmonics. Numerical examples of technique application.

Offering a comprehensive understanding of power systems, this book is an asset to power engineers involved in the planning, design and operation of power system generation, transmission and distribution. Researchers and postgraduate students in the field will also benefit from this useful reference.