Dynamic security region evaluation considering the uncertainty of renewable energy

With the increasing integration of renewable energy, the transient stability analysis (TSA) of the power systems becomes prominent. The dynamic security region (DSR) method can rapidly evaluate the transient stability and provide a feasible range of power injection, thus attracting wide attention. In this paper, a DSR evaluation method is proposed considering the uncertainty of renewable energy. Firstly, the critical points are searched based on the stability criterion of phase trajectory concave-convexity. Then, the boundary of DSR is approximated by several sub-planes considering instability mode differences. On this basis, the uncertainty of renewable energy is introduced, and the translation migration law of the DSR is proposed. Finally, the results of the IEEE 10-machine 39-bus system verify the validity of the proposed method.