Improving Contribution of DFIG-Based Wind Farms in Short-Term Frequency Regulation of Power Systems

This paper investigates the impacts and contribution of doubly-fed induction generator (DFIG) based wind farms in power system frequency regulation. First, the negative impacts of increasing penetration of DFIG-based wind farms on power system frequency regulation are studied. Then, DFIGs' useful capabilities and control methods to contribute in system frequency control are presented. Considering the problems of conventional control methods, a new method for participation of DFIG-based wind farms in short term frequency control is proposed. The method uses "average frequency" to estimate power imbalance, quickly and precisely. Then, the kinetic energy stored in the wind form inertia is exploited to compensate this power imbalance. Several simulations using a nine-bus test system are performed to demonstrate the effectiveness of the proposed method. Copyright (C) 2010 Praise Worthy Prize S.r.l - All rights reserved.