Dynamic Characteristics of ±800kV DC Transmission System under Single Phase Breaker Failure Action

Severe impact will be brought to hybrid AC/DC system when three-phase faults occur and single-phase breaker refuse to act, especially when disturbances are near DC converter. To perform the dynamic characteristics study under such condition, electromagnetism transient model of Yun-Guang plusmn800 kV DC transmission system is established, and dynamic characteristics of DC system such as DC power, voltage of converter bus and commutation failure condition are calculated and analyzed, when faults respectively occur on head and end terminal of transmission line near inverter. DC dynamic characteristics under different control mode are also compared. DC power is higher when constant power control mode is used comparing with constant current control mode, while reactive power consumed by converters are higher after disturbance under constant power control. And it will provide reference to the operation of plusmn800 kV DC transmission system.