The application of SiC (silicon carbide) devices in wind power, flexible transmission and rail transit is mainly reflected in breaking through the limitations of silicon-based power devices in high voltage, high power and high temperature, and being able to achieve application advantages of high frequency, high reliability, high efficiency and low loss.
In rail transit, SiC devices, characterized by high temperature and voltage tolerance, high-speed switching and low loss, impressively reduces the number and size of passive devices such as transformer, capacitor and inductor in the rail transit system, improves the size and weight of the overall system, miniaturize the system and make it lightweight, and thus improves the power density and energy efficiency of rail transit.
In industrial motor drive, as the industrial electricity demand grows, industrial motor drives are needed to increase efficiency and reduce the environmental impact on the planet. The use of silicon carbide in driver circuits can make the motor drive system smaller and lighter, reduce the heat generated by the system, lowers costs and improves reliability.
The flexible power transmission technology including the flexible alternating current transmission system (FACTS) and the power electronic transformer (PET) is an indispensable part of the modern power system, and is crucial to improving flexibility and stability of the power system. As SiC devices have the characteristics of high frequency, high efficiency and high power density, the use of SiC devices in the power transmission system can greatly reduce the number of series subunits, and thereby improve efficiency and reliability of the entire power transmission system.
In wind power, the application of SiC devices facilitates smart grid development and transformation. As the SiC material boasts high breakdown field strength, high temperature tolerance, high carrier mobility and high thermal conductivity, SiC devices can withstand higher voltage and power, higher switching frequency and higher operating junction temperature. These characteristics make SiC an ideal choice for key power electronic converters in the wind power system as it can help improve efficiency and reliability of the whole power generation system.