Direct Method for Solving Second-order Resonance in a Power System

The second resonance is the critical point of domain stable mode changes and the dynamic characteristics will be a sharp deterioration near the second order resonance point in a power system. That needs to quickly search system of second order resonance point while in-depth study of the power systems dynamic characteristics near the second order resonance point. Usually using continuation method for searching second order resonance point in past, and it is indirect and large amount of calculation. There based on the principle of minimal expansion system method, this paper presents the direct method for solving second order resonance point in a power system.By creating expansion equations of differential dynamic system, power systems of second order resonance point is transformed into expanding equation fixed point solution. The method ignificantly reduces computational load, improves search accuracy for solving second order resonance point calculation. By use of power system model, the simulation results show that the method is correct.