  This paper proposes a novel coordinating mechanism between synchronous
generators (SGs) and wind turbines (WTs) based on doubly-fed induction
generators (DFIGs) for enhanced primary frequency regulation. WTs are urged to
participate on frequency regulation, specially if wind power penetration keeps
increasing. WTs control support is possible, but it is transient due to the WTs
lack of energy storage. This drawback can result in either a further delayed
response from the governors of SGs or further frequency decay when WTs support
is over. The proposed coordination attempt to tackle this issue. An artificial
neural network (ANN) is used to obtain an optimal coordination signal to
improve frequency response. As a proof of concept, the proposed coordination is
tested on a 9-bus test system that includes a wind farm with 5 WTs. Simulation
results show that frequency nadir is reduced in about 22\% and rates of change
of the system frequency (RoCoF) in about 29.5\%. Further work is needed to
validate this concept in large-scale systems, but the development and results
obtained so far are promising to strengthen power systems.
