Parameter identification of synchronous generator based on phase to phase fault current
Accurate parameter identification of synchronous generators is an important foundation for ensuring tran-sient stability analysis of power systems.Firstly,based on the equivalent mathematical model,sequence network diagram and equivalent circuit of synchronous generator,the expression of transient current under the condition of phase to phase short circuit fault through external impedance is derived.Then,using short-circuit tests and identifi-cation to obtain the minimum objective function of the square sum of standardized errors between short-circuit cur-rents,an improved whale optimization algorithm with increased weight coefficients is adopted to propose a parameter identification method for synchronous generators based on phase to phase short-circuit fault currents.Finally,a short-circuit test was conducted on an actual synchronous generator to verify the correctness and effectiveness of the proposed method.The method in this paper improves the accuracy of identification by increasing the excitation en-ergy of synchronous generator and using the fault current in the process of large disturbance as the original data.At the same time,combining the nonlinear characteristics of the short-circuit current model,the whale optimization al-gorithm is improved to better adapt to nonlinear parameter identification.
NETL
NSTL
万方数据
维普
