Active and Reactive Power Control of a Grid-Connected PM Wind Generator

Due to the fluctuation of the wind speed, wind energy systems are typically connected to the utility grid through back-to-back converters and a DC coupling. Although this topology provides a stable voltage on the grid side, it makes the control system relatively complicated. In this paper, a model for the machine-side converter and the controller is derived in the rotor reference frame. Using αβ0 transformation to detect the voltage phase angle, a decoupled control of the active and the reactive power is achieved. As a result, a simple PI controller is used to control the active and reactive power flow of the machine side converter. The performance of the controller is tested using the MatLab/Simulink simulation. The results show that the controller has provided the desired performance.