Wind Turbines Modeling And Parameter Identification Method

Combined with the current status of a doubly fed wind turbine in a regional power grid,This research established practical model of wind turbine and wind farm model,it can meet the general technology requirements of the engineering application.The main research work of this paper is as follows:(1)According to the principle of the wind turbine,by the analysis of the conversion of wind power and its mechanical part,the mathematics model was set up.And based on this,the mathematics modeling of a doubly fed wind turbine was studied.(2)A simplified DFIG mathematical model and physical model of doubly fed induction generator(DFIG)in three-phase stationary and two-phase synchronous rotating dq coordinate system were studied.By simplifying model parameter identifiability analysis,a simplified dynamic equivalent circuit was introduced.(3)The identification method of the simplified model parameters of 1.5MW DFIG units of two models A and B in a typical regional double-fed generator network was studied,and the necessary model parameters were obtained effectively.(4)The steady state and dynamic equivalent model of the wind farm were studied and verified by simulation.The results verified the proposed wind turbine model and parameter identification analysis method.Based on the decoupling control characteristics of the wind turbine,a transient model of a wind turbine in the process of voltage drop and recovery was established in this paper,and the parameters of the model were identified according to the measured data of the unit,which was used for the simulation calculation.The Matlab software platform was used for the expected effect is achieved.The simulation results show,there are large differences in the parameters of the simplified equivalent model for different manufacturers of doubly-fed units.So parameter identification according to the actual testing characteristics of different type wind turbine is needed.