Harmonic compensation for variable speed DFIG wind turbines using multiple reference frame theory

Abstract

This paper proposes novel methods to compensate the grid current harmonics by controlling the back to back converter of dual-fed induction generator (DFIG). The selected low-order harmonics is detected and calculated by a multiple reference frame harmonics estimator. The control methods of how to regulate the harmonics are developed for both the gridside converter (GSC) and the rotor-side converter (RSC) of the back to back converter attached to the DFIG. The harmonics regulator control for GSC and RSC are parallel with the main decoupled control of the back to back converter operating the DFIG wind turbine system to generate electrical power to grid. Matlab/Simulink is employed to investigate the performance of proposed methods.

Harmonic Analyzing of the Double PWM Converter in DFIG Based on Mathematical Model

“…In regards to wind power generation, the double fed induction generator (DFIG) has become the leading type of wind turbines. As a variable speed wind generator, DFIG has many advantages compared with other types, such as its good stability after connecting to the grid, and decoupled control of active and reactive power [9][10][11]. These advantages are realized on the basis of the pulse width modulation (PWM) converter, which is widely used in the DFIG systems for its ability to realize a bidirectional flowing of energy.…”