Parameters Identification of the Three-Phase Wound-Rotor Induction Machine

Abstract

In order to implement the adequate control of the wind turbine it is necessary to know the parameters of the electric generator. Due to the robustness, acquisition cost and maintenance, the three-phase wound-rotor asynchronous generator is used. The objective of this paper is to apply an identification method in order to find the electrical parameters (for both stator and rotor windings) of the three-phase asynchronous machine used as electric generator to be introduced for calculating the appropriate parameters of the control loops regulators. The most common identification method is the least squares one and it is used in this paper. The objective function is described, the identified parameters are chosen by minimization of the performance index. The synchronous reference frame based mathematical model of the induction machine (IM) is provided. Therefore, the vector control of the wind turbine is the most suitable control method. The Matlab implementation of the proposed method is presented in the paper. In order to show the performance of the used identification method, the real parameters values of the three-phase IM's are compared with the parameters obtained through the identification algorithm by using the proposed mathematical model of the IM. The validation of the proposed method has been achieved both by numerical simulation, and experimental results. Validation of the mathematical model is important for using in both for the hardware in the loop control (HIL) and for diagnosis purposes.