Parameterization in transient analysis based on polynomial approximation

Abstract

With the rapid development of power grid, power system security and stability will face more severe tests, and the stability analysis and control of power system research has received extensive attention. Aiming at the parameterization problem in transient stability analysis, a parameterized transient stability trajectory approximation method based on polynomial approximation method is proposed. In the proposed method, a polynomial approximation composed of polynomials and coefficients of a series of parameters is used to approximate the system variables, and the relationship between the variable parameters and the dynamic trajectory is established. Compared with the existing trajectory sensitivity methods, the proposed method greatly improves the accuracy under the condition of large parameter variation and strong nonlinear system, and has the global controllable accuracy characteristics within the variable parameter variation range.