Enhancement of Output Power Smoothing and Transient Stability of DFIG-Based Wind Energy Conversion System Using Optimized Controllers Parameters

In this paper, an attempt is made to tune the controllers of a doubly fed induction generator (DFIG)-based wind energy conversion system (WECS). The procedure is optimized to improve the performance of the WECS under both normal and transient operating conditions. It is shown that under normal operating conditions, the outer control loop of the rotor side converter, i.e., speed controller, affects the quality and quantity of output power. Therefore, to extract the maximum available power and smooth the power injected to the grid, this controller is tuned. On the other hand, other controllers affect the response of the DFIG during transient conditions. Thus, to improve the transient stability of the DFIG, the parameters of these controllers are tuned based on the eigenvalue analysis. To verify the performance of the proposed tuning method, comparisons between the proposed and conventional pole placement methods, under normal and fault operating conditions, are presented.