Analysis and Optimization of China 1000kV UHVAC Power Grid Voltage Security, Operational Flexibility, and Economic Efficiency using Machine Learning

This paper proposes a method to determine best options for transmission system expansion for UHVAC systems, considering a) voltage security regarding lighting overvoltage, b) operational flexibility using contingency analysis, and c) economics efficiency using machine learning. Inspired by standard contingency analysis, the method provides an integrated ranking approach to synthetize optimal solutions for expansion. The method is integrated using commercial power system software, and it is demonstrated on China's 1000kV UHVAC Power Grid. The validity of the method is verified by the actual decisions included in China's 1000kV UHVAC power grid expansion plan.