Modeling Principle and Parameter Identification of Double Fed Wind Turbine for Electromechanical Transient Simulation of Power System

Abstract

Inner Mongolia power grid is the key area of wind generator development in China, in which double fed wind turbine assembly accounts for a large proportion. Based on the principle of variable speed constant frequency operation and PQ decouphng control of double fed wind turbine, the basic principle of mechanical and electrical simulation modeling of double fed wind turbine is given by combining the measured characteristics and theoretical analysis: the control command is directly converted into the rotor DQ current of the generator, and then through the motor model and the grid interface, the normal control and low through control are paralleled, through the voltage drop by switching. On the basis of DQ decoupling control, a decoupling identification method of active power and reactive power low ride through characteristics for different faults is proposed. The parameters of the LVRT model can be identified by using the test data of the unit. In this paper, the method is used to identify the typical measured data, and the normal control model parameters and low penetration control model are obtained, and the correctness of the identification method is verified through the verification of the measured data and the curve comparison.