In view of the increasing shortage of traditional emergency control resources in the power grid

the rapidity and bidirectional power control ability

which is controlled by the the electrochemical energy storage (EES)

is used to study its application for transient power angle stability control. Firstly

the dual machine equivalent model with EES is deduced. Based on EEAC theory

the principle of EES to improve the transient stability margin is analyzed. Secondly

the method for calculating effective operation duration of energy storage station with consideration of time sequence difference of equipment and system protection is proposed

which improves the working efficiency of emergency control energy storage. The formulation method of coordinated and control strategy of multiple measures considering energy storage and based on performance cost is proposed

the safety and economy of the emergency of emergency control are considered so to provide on line auxiliary decision support for the transient emergency control of the power grid. Furthermore

the panorama monitoring system structure of the energy storage station is proposed

which provides technical practice idea for the interaction of energy storage station and the emergency control system of power grid. Finally

both effectiveness and rationality of the proposed method are verified in the actual calculation example in China Northwest Power Grid. The study conclusion can provide theoretical reference for the expansion and construction of the second line of defence of the power grid for the large scale energy storage and high ratio new energy power grid.