A Glossary of Computing Terms

Computers & Technology

HUNTER, Alan

Jackson, Brian

Reeve, Tim

Rogers, Graham

Southall, John

Burdett, Arnold

Burkhardt, Diana

Hurvid, Frank

Jaworski, John

Computer Science

Longman Pub. Group

Power System Oscillations deals with the analysis and control of low frequency oscillations in the 0.2-3 Hz range, which are a characteristic of interconnected power systems. Small variations in system load excite the oscillations, which must be damped effectively to maintain secure and stable system operation. No warning is given for the occurrence of growing oscillations caused by oscillatory instability, since a change in the system's operating condition may cause the transition from stable to unstable. If not limited by nonlinearities, unstable oscillations may lead to rapid system collapse. Thus, it is difficult for operators to intervene manually to restore the system's stability. It follows that it is important to analyze a system's oscillatory behavior in order to understand the system's limits. If the limits imposed by oscillatory instability are too low, they may be increased by the installation of special stabilizing controls. Since the late 60s when this phenomena was first observed in North American systems, intensive research has resulted in design and installation of stabilizing controls known as power system stabilizers (PSS). The design, location and tuning of PSS require special analytical tools. This book addresses these questions in a modal analysis framework, with transient simulation as a measure of controlled system performance. After discussing the nature of the oscillations, the design of the PSS is discussed extensively using modal analysis and frequency response. In the scenario of the restructured power system, the performance of power system damping controls must be insensitive to parameter uncertainties. Power system stabilizers, when well tuned, are shown to be robust using the techniques of modern control theory. The design of damping controls, which operate through electronic power system devices (FACTS), is also discussed. There are many worked examples throughout the text. The Power System Toolbox© for use with MATLAB® is used to perform all of the analyses used in this book. The text is based on the author's experience of over 40 years as an engineer in the power industry and as an educator.

Power System Oscillations (Power Electronics and Power Systems)

Science & Math

Technology

Kluwer Academic Pub 1999-12-01

This book is an account of poverty in the East End of London at the beginning of the twentieth century and of life in the Royal Navy as a stoker, before, during and after the First World War.From the poverty of London's East End to the Royal Navy, "Smudge's Story" tells of the early life of Fred Smith. In his own words, Fred recounts his life as a stoker and his part in the struggle against First World War U-boats in his tiny ship tossed by huge Atlantic waves, and of the terrified faces of those he rescued from icy seas. Fred describes his fears, his joys and his growing love for his sweetheart back home. He also tells of his involvement with the Sinn Fein riots in Ireland, of the freezing Baltic, the sweltering Mediterranean and of the civil war, which followed the Russian revolution. Fred and his shipmates encounter snipers, wild dogs and desperate women. They witness thousands of refugees trying to flee the advancing Red Army by boarding their ship, which is helplessly locked in the ice of Odessa's harbour. How does a ship's stoker, an ordinary man, cope in such epic times of death and suffering? Unread for many years, this story is now brought to life. Edited and published by his family, it presents a unique and fascinating account of the worst of times in our country's history.

Smudge's Story

Smith, Frederick

Reader, Wendy

Biographies & Memoirs

Independently published

Power System Oscillations deals with the analysis and control of low frequency oscillations in the 0.2-3 Hz range, which are a characteristic of interconnected power systems. Small variations in system load excite the oscillations, which must be damped effectively to maintain secure and stable system operation. No warning is given for the occurrence of growing oscillations caused by oscillatory instability, since a change in the system's operating condition may cause the transition from stable to unstable. If not limited by nonlinearities, unstable oscillations may lead to rapid system collapse. Thus, it is difficult for operators to intervene manually to restore the system's stability. It follows that it is important to analyze a system's oscillatory behavior in order to understand the system's limits. If the limits imposed by oscillatory instability are too low, they may be increased by the installation of special stabilizing controls. Since the late 60s when this phenomena was first observed in North American systems, intensive research has resulted in design and installation of stabilizing controls known as power system stabilizers (PSS). The design, location and tuning of PSS require special analytical tools. This book addresses these questions in a modal analysis framework, with transient simulation as a measure of controlled system performance. After discussing the nature of the oscillations, the design of the PSS is discussed extensively using modal analysis and frequency response. In the scenario of the restructured power system, the performance of power system damping controls must be insensitive to parameter uncertainties. Power system stabilizers, when well tuned, are shown to be robust using the techniques of modern control theory. The design of damping controls, which operate through electronic power system devices (FACTS), is also discussed. There are many worked examples throughout the text. The Power System Toolbox© for use with MATLAB® is used to perform all of the analyses used in this book. The text is based on the author's experience of over 40 years as an engineer in the power industry and as an educator.

Engineering & Transportation

Engineering

Springer

This book is an account of poverty in the East End of London at the beginning of the twentieth century and of life in the Royal Navy as a stoker, before, during and after the First World War. From the poverty of London’s East End to the Royal Navy, “Smudge’s Story” tells of the early life of Fred Smith. In his own words, Fred recounts his life as a stoker and his part in the struggle against First World War U-boats in his tiny ship tossed by huge Atlantic waves, and of the terrified faces of those he rescued from icy seas. Fred describes his fears, his joys and his growing love for his sweetheart back home. He also tells of his involvement with the Sinn Fein riots in Ireland, of the freezing Baltic, the sweltering Mediterranean and of the civil war, which followed the Russian revolution. Fred and his shipmates encounter snipers, wild dogs and desperate women. They witness thousands of refugees trying to flee the advancing Red Army by boarding their ship, which is helplessly locked in the ice of Odessa’s harbour. How does a ship’s stoker, an ordinary man, cope in such epic times of death and suffering? Unread for many years, this story is now brought to life. Edited and published by his family, it presents a unique and fascinating account of the worst of times in our country’s history.

Smudge's Story: The story of an East End lad serving in the Royal Navy in the First World War

Smith, Mr Frederick W

CreateSpace Independent Publishing Platform

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