Doubly-fed Induction Generator

The doubly-fed induction generator (DFIG) system is a popular system in which the power electronic interface controls the rotor currents in order to achieve the variable speed that is necessary for maximum energy capture in variable winds. Because the power electronics only process the rotor power, which is typically less than 25% of the overall output power, the DFIG offers the advantages of speed control for a reduction in cost and power losses.

This report presents a DFIG wind turbine system that is modeled in PLECS. A full electrical model that includes the switching converter implementation for the rotor-side power electronics and a model of the induction machine is given. The aerodynamics of the wind turbine and the mechanical dynamics of the induction machine are included to extend the use of the model to simulating system operation under variable wind speed conditions. For longer simulations that include these slower mechanical and wind dynamics, an averaged PWM converter model is given. The averaged electrical model offers improved simulation speed at the expense of neglecting converter switching detail.

Requirements

 PLECS 2.1 or newer
 Matlab 7.0 (R14) or newer

Download

The file plecs_DFIG.zip (1170 KB) contains the example model and documentation in PDF format.