Improving Survivability of Electric Power Systems by WAMS Data Controlled Energy Storage

North-West – Center – Belarus intertie model with corresponding system connections has been developed. It is confirmed that intertie has rather low indices of small-signal oscillatory and transient stability. To improve survivability of power system, traditional frequency control is supplemented by feedbacks of phasor difference and its second derivative measured in different parts of interconnection. Its operation has been tested at several large power plants during short circuits at various points of the system. It is shown that transient stability increases by more than 4 times, and in addition, small-signal oscillatory stability growths by more than 3 times. In a number of cases, turbine control is replaced by action of battery energy storage systems (BESS) operating in post-emergency situations. Various options for its control are considered. It is shown that intertie transient stability with exponential controlled BESSs increases from 1.5 to 6 times.