Dynamics and Control of Electric Transmission and Microgrids

Preface

Although power systems have been in operation for more than a century, they continue to grow in size and extent, not only by expansion in demand, but also through system interconnections which bring about reduction in costs and improvement in the reliability of supply. For example, in India, five regional electricity networks have been interconnected to form an all‐India grid. However, interconnections can also result in security issues when the system is subjected to large disturbances. To mitigate these problems and improve security, major qualitative changes have occurred in the operation and control of grids over the past couple of decades. The key technologies that have been developed and deployed include (i) renewable energy systems, (ii) voltage‐source converters for high power applications, and (iii) wide‐area measurement systems (WAMS). This book has been motivated by the need to integrate these components in the conventional power system analysis framework in order to understand their impact on the stability of power systems.

A significant proportion of power in many large power grids is now from renewable energy sources (solar, wind, and hydro) and this is likely to grow further. In contrast to the conventional large and centralized power stations, renewable energy generation is mostly in the form of a large number of relatively smaller and distributed energy sources. Since these sources are environment friendly and come in smaller units, they can often be deployed ...