Open AccessImproved super‐twisting sliding mode control of a stand‐alone DFIG‐DC system with harmonic current suppression
Author(s) -
Guo Lei,
Wang Dan,
Peng Zhouhua,
Diao Liang
Publication year - 2020
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2019.0691
Subject(s) - control theory (sociology) , doubly fed electric machine , robustness (evolution) , state observer , voltage , induction generator , rotor (electric) , harmonic , observer (physics) , regulator , current (fluid) , computer science , engineering , physics , nonlinear system , ac power , control (management) , chemistry , electrical engineering , artificial intelligence , quantum mechanics , biochemistry , gene
This study presents an improved super‐twisting sliding mode (SSM) approach to a stand‐alone doubly fed induction generator (DFIG) for direct current (DC) generation system. By taking the uncertainties into consideration, an improved SSM regulator based on an extended state observer (ESO) is proposed to enhance the robustness of DC‐voltage regulation. Moreover, a novel sinusoidal rotor current calculation method is proposed to generate sinusoidal reference of rotor current. A resonant‐based ESO (R‐ESO) SSM approach is proposed to regulate rotor current. By applying the R‐ESO to estimate the model‐related part of DFIG, the tracking performance with respect to a sinusoidal reference is improved. Then, the suppression ability to fifth and seventh harmonic currents are enhanced. Finally, both simulations and experiments on a 6‐kW DFIG‐DC system are provided to show the effectiveness of DC‐voltage regulation and harmonic current suppression of the proposed approach.