WSEAS Transactions on Power Systems
Print ISSN: 1790-5060, E-ISSN: 2224-350X
Volume 8, 2012
System Frequency Regulation Investigation in Doubly Fed Induction Generator (DFIG)
Authors: ,
Abstract: The conventional decoupling control in the variable-speed doubly fed wind turbines has little support to the system frequency. The characteristics of doubly fed induction generator (DFIG) wind turbines and conventional plant are compared. The contributions of DFIG to system inertial response and frequency regulation are investigated. The influence of auxiliary loop parameters on the inertial response is illustrated. The paper also introduces a novel algorithm to enhance the participation of DFIG in existing frequency regulation mechanisms. The proposed approach takes advantage of the fast response capability associated with DFIG. The control system consists of four functional modules, i.e. frequency control, rotational speed delay recovery, speed protection and coordination control with conventional generators. Simulation results show that the control strategy has a fast response speed to the transient frequency error. It proves that wind farms can participate in the system frequency regulation to a certain extent.