DFIG wind turbine grid connected for frequency and amplitude control in a smart grid

Abstract

Power generated from wind is a fast growing renewable source of the world energy consumption. A double feed induction generator (DFIG) used in wind turbines, provides dynamic and static active and reactive power support. In this paper, the droop control technique is used to regulate the grid amplitude and frequency according to the criteria defined for the smart grid supervisor. Wind turbine will operate in an unloaded maximum power curve, and according to the reserved active power to correct the frequency deviation, the limit of the reactive power or voltage amplitude correction will be explained. In addition, the offset adjustment of the encoder and the stator synchronization and connection to the grid will be explained. The connection process to the grid and the regulation of a real 7.5kW DFIG is performed controlling the active and reactive powers to their reference values. For that, a platform based on a real-time interface with the DS1103 board is used.