Multi-terminal Direct-Current Grids: Modeling, Analysis, and Control

Foreword

In recent years, the electric power delivery system has been changing dramatically. Concern for the environment, the economy, and power system security has placed stringent demands on power transmission. We must acknowledge the inevitable depletion of fossil fuels and the growing importance of sustainable and environmental awareness. Electricity derived from renewable energy sources offers advantages in terms of economical efficiency, especially when compared with oil, gas and coal.

Existing rights-of-way for high voltage transmission lines are generally underutilized and some transmission circuits are nearing their end of life. New rights-of-way for overhead transmission lines are becoming difficult if not impossible to acquire. Voltages Sourced Converter (VSC) transmission is the way forward with its capability to operate with many terminals, allow for greater power density in its circuits, and replace aging AC transmission lines or existing AC lines that may be converted to DC. DC overhead transmission lines can be compacted to share right-of-way with roads and railway lines. VSC transmission is more favorable for use with underground and undersea cable transmission where it is expedient to do so.

In the future, issues of the combination of diversity of loads, wind and solar energy across wide geographical areas will become crucial. DC grids are critical to solving these major concerns.

This book initiates the technical background that applies to multi-terminal DC ...