The country is vigorously developing new infrastructure, and the ultra-high voltage (UHV) transmission project has a significant demand for silicon carbide power devices. Its main application scenarios in the smart grid include: high-voltage direct current (HVDC) transmission converter valves, flexible DC transmission converter valves, flexible AC transmission devices, HVDC circuit breakers, power electronic transformers, and other devices. Compared to other power electronic devices, the power system requires higher voltage, greater power capacity, and higher reliability. Silicon carbide devices break through the system limitations caused by the limitations of silicon-based power semiconductor devices in terms of high voltage, high power, and high temperature, and have unique advantages such as high frequency, high reliability, high efficiency, and low loss. They promote the development and transformation of the smart grid in applications such as solid-state transformers, flexible AC transmission, flexible DC transmission, HVDC transmission, and distribution systems.