A Fast Method for Transient Stability Assessment Based on Taylor Series Expansion

The work presented in this paper describes a fast technique based on Taylor series expansion for transient stability assessment and preventive control. In the process of system dynamic trajectory simulation and integration of sensitivity dynamic equations, high order derivatives of rotor angles, speed and sensitivity variables with respect to time can be calculated recursively by this method. Therefore bigger simulation time step can be employed, which can improve computation speed and keep normal calculating precision. In the process of preventive control, the sensitivity of energy margin with respect to generator mechanical input power can be calculated using numerical method by Leibniz integral rule. Test results on New England 10-generator system and IEEE 17-generator system show that this method is of good accuracy and prospective for on-line application