Active Disturbance Rejection Control Strategy for Direct Power Control of a DFIG-Based Wind Turbine Connected to the Undisturbed Utility Grid

Abstract

This paper proposes an Active Disturbance Rejection Control (ADRC) strategy applied to synthesize the controllers of the DFIG-based Wind Energy Conversion System (WECS) connected to a utility grid under normal conditions. These controllers drive WECS to inject its maximum power into the utility grid (by MPPT control) for lower wind speeds, and to limit this production at its nominal power for strong winds by controlling the pitch angle. ADRC is one of the algorithms that estimate and cancel, in real time, external and internal disturbances. Its design does not require an accurate system model of the system under control; a discussion on its structure and its principle is conducted. Simulation analyses of the proposed scheme to manage the presented WECS are performed in the MATLAB-Simulink environment. These simulation results will be compared to the ones when the command is based on classic PI controllers and also to the experimental results performed on a wind emulator. The obtained results demonstrate the superiority and the effectiveness of the proposed control strategy and approach.