A Hybrid H∞-MRAS Observer of Wind Turbines Conversion Systems based on DFIG

Saihi, Lakhdar; Bakou, Youcef; Ferroudji, Fateh; Abdelkader, Hadidi; Oulimar, Ibrahim

Algerian Journal of Renewable Energy and Sustainable Development
Volume 4, Numéro 1, Pages 101-110
2022-06-15

A Hybrid H∞-mras Observer Of Wind Turbines Conversion Systems Based On Dfig

Authors : Saihi Lakhdar . Bakou Youcef . Ferroudji Fateh . Abdelkader Hadidi . Oulimar Ibrahim .

Abstract

This study proposes the robust sensor-less advanced frequency control (robust H∞ control) of the system of wind turbine based on a doubly fed induction generator (DFIG), the power exchange between the machine stator and the network is achieved by applying the rotor of DFIG via a bidirectional converter. The purpose of the control is to regulate the stator active and reactive power produced by the DFIG using a robust H∞ controller.The Model reference and adaptive system (MRAS-Observer) uses the error between the actual and estimated values (voltage/current) to construct the observed mechanical parameters (speed and position) value, this technique uses two separatemodels: the first is the reference model, the second is the adjustable mode. The error between these models is used by the adaptive mechanism. The adjustment mechanism is mostly a PI controller, to improve the performance and robustness of the classical MRAS observer, we replace the classical PI controller with a robust H∞ controller. The results simulations confirm the robustness of the sensorless robust H∞ control using the H∞-MRAS observer compared to conventional MRAS, which improves the quality and quantity of generated power