Fault ride-through capability improvement in a DFIG-based wind turbine using modified ADRC

Abstract In this paper, an overview of several strategies for fault ride-through (FRT) capability improvement a doubly-fed induction generator (DFIG)-based wind turbine is presented. Uncertainties and parameter variations have adverse effects on the performance these strategies. It desirable to use control method that robust such disturbances. Auto disturbance rejection (ADRC) one most common methods eliminating To improve conventional ADRC, modified ADRC introduced more disturbances offers better responses. The non-derivability fal function used in degrades its efficiency, so uses alternative functions are derivable at all points, i.e., odd trigonometric hyperbolic ( arcsinh , arctan, tanh ). efficiency proposed fuzzy logic fractional-order simultaneously. (FFOADRC), evaluated using nonlinear extended state observer (NFESO). suggested structure investigated MATLAB/Simulink. simulation results show during as network voltage sag/swell, ADRCs leads smaller fluctuations stator flux amplitude DC-link voltage, lower DFIG velocity, total harmonic distortion (THD) current. This demonstrates superiority over proportional-integral (PI) controller. Also, by changing crowbar resistance ADRCs, peak values waveforms (torque currents) can be controlled moment occurrence with no significant distortion.