Rotor Field Oriented Control of Doubly Fed Induction Generator in Wind Energy Conversion System

In this study, robust and high-performance vector control of a rotor side converter (RSC) is performed for the stability and efficient operation doubly fed induction generator (DFIG) based on the variable speed wind turbine (VSWT). The mathematical model of the DFIG is simulated by using Matlab/Simulink. The amplitude and frequency of the voltage in the DFIG is controlled for different values of load and variable speeds. In the experimental study, a DFIG-based wind turbine system is set up in the laboratory. The field position of stator is detected from stator voltages by a phase locked loop (PLL) circuit. The rotor position is measured with an incremental encoder connected to the rotor shaft of the DFIG. The angular position of slip is calculated by the difference between the rotor and the stator field positions. The frequency and amplitude of rotor currents are determined with the angular position of slip. The space vector pulse width modulation (SVPWM) technique is used to generate the output voltages of the converter that feeds the rotor windings. In the experimental study, the rotor side converter is controlled with the DS1103 board. The prepared experiment set is tested at different operating speeds.