There are large amount of calculation using continuation method to search the Bogdanov-Takens bifurcation point in power systems, and the traditional direct method requires accurate initial value, as its feature vector norm has uncertainty. In view of this problems, a improved direct method was put forward. This method used the constraint features of vector and it’s transposed, improved expansion equations feature vector constraint. The method could converge to the Bogdanov-Takens bifurcation point in the larger range of initial values, improved the effectiveness of the proposed algorithm. Simulation of power system through the model verified its correctness.
