Design of Comprehensive Defense System for UHV AC and DC Power Grids Security

In today's China, UHV AC and DC hybrid power grid has the new feature of “strong HVDC and weak AC system” and power electronization. Response to this new situation, in order to effectively reduce the risk of large-scale power outages in power grid, it is necessary to build a secure and reliable comprehensive defense system for power grid security to ensure secure and stable operation of China's power system. Based on the current three defense lines in China, this paper argues the goals and design principles of the UHV AC and DC power grid security defense system that adapt to the new characteristics of China's power grid, and designs the overall structure of the UHV AC/DC power grid security defense system, main functions and specific configuration schemes.