OPERATION AND REVIEW OF DOUBLE FEED INDUCTION GENERATOR (DFIG) FOR CONSTANT POWER CONTROL IN WIND POWER PLANT

Abstract

Wind turbine generators (WTGs) are usually
controlled to generate maximum electrical power from wind
under normal wind conditions. With the increasing
penetration of wind power into electric power grids, energy
storage devices will be required to dynamically match the
intermittency of wind energy. To meet the requirements of
frequency and active power regulation, energy storage
devices will be required to dynamically match the
intermittency of wind energy. A novel two-layer constantpower control scheme for a wind farm equipped with
doubly-fed induction generator (DFIG) wind turbines. It is
connected to the power grid at both stator and rotor
terminals. The stator is directly connected to the grid while
the rotor is fed through a variable-frequency dc-linkvoltage converter, which consists of a rotor-side converter
(RSC) and a grid-side .converter .Each DFIG wind turbine
is equipped with a super capacitor energy storage system
(ESS) and is controlled by the low-layer WTG controllers
and coordinated by a high-layer wind-farm supervisory
controller (WFSC). The proposed system and control
scheme provides a promising solution to help achieve high
levels of penetration of wind power into electric power
grids.