Trajectory sensitivity analysis application for power system security assessment with wind generation

This paper describes the effect of wind generation on the security assessment of power system using trajectory sensitivity analysis (TSA). The system is modeled to include wind generation dynamics. The wind generator used is the doubly-fed induction generator (DFIG). An algorithm is achieved in the MATLAB environment. The algorithm has two parts: the power system analysis toolbox (PSAT) main algorithm and the other part is proposed to handle the calculation of TSA coefficients. These coefficients are calculated each time step of the dynamic simulation to get the full trajectory. The whole algorithm is time-synchronized and is tested on the IEEE 68-bus system to show the impact of wind generation on the system state variables and hence the security assessment. The simulation results show that the algorithm can be used to find the most sensitive state variables to the DFIG changed parameter.