UPFC control method with rapid terminal sliding mode variable structure

The invention discloses a UPFC control method with a rapid terminal sliding mode variable structure. The UPFC control method comprises: decoupling is carried out on an established systematic mathematic model to obtain a system state equation that can be controlled by a sliding mode variable structure conveniently; according to the actual situation of the system, a terminal sliding mode variable structure is selected; a controller controlled by a parallel side terminal sliding mode variable structure and a controller controlled by a series side terminal sliding mode variable structure can be designed; a controller controlled by the terminal sliding mode variable structure at a direct-current capacitor link is designed; and according to a physical meaning of a target variable, selection quantity measurement and calculation are carried out and a target expectation control signal is outputted, and space vector control is carried out to obtain trigger signals of a series side converter and a parallel side converter. According to the invention, the active and reactive power of the controlled power transmission line can be controlled rapidly and effectively; the adaptability and robustness of the system after disturbance can be improved; and thus the safe and stable operation of the power grid can be guaranteed.