Research on new automatic bus transfer method which adapts to security and stability control system

Traditional automatic bus transfer methods have difficulty in correctly telling whether it is short-circuit fault or incoming line tripping by security and stability control devices which leads to bus voltage losing. It may cause automatic bus transfer device incorrect operation or refusing action, which effects the stable operation of the power system and reliability of power supply. This paper proposes a new automatic bus transfer method to adapt to security and stability control system according to the different characteristics of bus voltage and incoming line current when the incoming line is cut due to security and stability control system or incoming line short-circuit fault. The method can lock automatic bus transfer function when security and stability control system cuts the incoming line, and it can also reliably open automatic bus transfer function when the incoming line is removed due to fault. The correctness of this method is verified by simulation test.