With large-scale wind power connected to the grid

researches on the energy function method incorporated with wind power generation will help improve the computation speed of stability assessment and provide sensitivity information to stability control. Inspired by structure preserving energy function

the concept of port energy is proposed. It is proved that the total energy is an energy function with part of the transient energy calculated by port energy. The energy aggregation effect of port energy is also proved. The causes leading to errors in transient stability assessment are also analyzed when port energy is used. An energy function method is proposed for power systems with wind generation based on port energy. The effectiveness of the method is validated by a comparison of critical clear times in different scenarios. In terms of computation accuracy

the proposed method is 0~0.02 s more conservative than numerical simulation

while in terms of computation speed

the proposed method is 3~26 times faster than the bisection method or the step by step method based on numerical simulation. This work is jointly supported by National High Technology Research and Development Program of China (863 Program) (No. 2012AA050201) and National Natural Science Foundation of China (No. 51190103).