Given the increasingly busy railway networks, increased axle loads, and railway speeds, modern railways and urban transport systems require smart and energy-efficient traction power supply products and solutions to ensure safe, reliable, and environmentally sustainable operations. Based on the latest development and achievements of China's traction power supply system, Smart Traction Power Supply Systems for High-speed Railways focuses on the latest research into smart traction power supply systems. Starting from the concept of smart technologies, it describes the structure and functions of smart traction power supply systems, including smart power supply and transformation facilities, smart power supply operation and maintenance management systems, smart power supply dispatching systems, and high-speed communication networks. This book covers both theory and the implementation, methods, and case studies of wide area protection, selfhealing reconstruction, fault prognosis, health assessment, and power supply dispatching.