Open AccessTorque controller of a doubly‐fed induction generator impelled by a DC motor for wind system applications
Author(s) -
Morfin Onofre A.,
RuizCruz Riemann,
Loukianov Alexander G.,
Sánchez Edgar N.,
Castellanos M.I.,
Valenzuela Fredy A.
Publication year - 2014
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
eISSN - 1752-1424
pISSN - 1752-1416
DOI - 10.1049/iet-rpg.2012.0291
Subject(s) - control theory (sociology) , direct torque control , induction motor , induction generator , torque motor , doubly fed electric machine , torque , dc motor , generator (circuit theory) , wind power , computer science , control engineering , engineering , physics , electrical engineering , control (management) , ac power , power (physics) , voltage , quantum mechanics , artificial intelligence , thermodynamics
The authors propose robust non‐linear controllers for a wind system. The proposed controllers are based on a combination of the block control linearisation and super‐twisting algorithm, as a second‐order sliding mode technique. The main control loop is designed to regulate the electromagnetic torque and stator power factor of a doubly‐fed induction generator which is connected to the grid. The generator is mechanically coupled with a DC motor, which can emulate the wind turbine operation. Therefore, an auxiliary control loop is designed to control the DC motor velocity. Additionally, a grid‐side converter controller is proposed to regulate the DC‐link voltage into AC/DC/AC converter, and displacement factor of the energy flow between the rotor and the grid. A robust stability analysis of the complete closed‐loop system under external disturbances is presented. The robustness of the proposed control schemes is validated in real time using a workbench, which consists of a motor–generator group, AC/DC/AC electronic drive and dSPACE DS 1104 controller boards.