Second-Order Sliding Mode Control of a Doubly Fed Induction Generator Driven Wind Turbine

Abstract

Abstract-This paper deals with power extraction maximization of a doubly fed induction generator (DFIG)-based wind turbine. These variable speed systems have several advantages over the traditional wind turbine operating methods, such as the reduction of the mechanical stress and an increase in the energy capture. To fully exploit this latest advantage, many control schemes have been developed for maximum power point tracking (MPPT) control schemes. In this context, this paper proposes a second-order sliding mode to control the wind turbine DFIG according to references given by an MPPT. Traditionally, the desired DFIG torque is tracked using control currents. However, the estimations used to define current references drive some inaccuracies mainly leading to nonoptimal power extraction. Therefore, using robust control, such as the second-order sliding mode, will allow one to directly track the DFIG torque leading to maximum power extraction. Moreover, the proposed control strategy presents attractive features such as chattering-free behavior (no extra mechanical stress), finite reaching time, and robustness with respect to external disturbances (grid) and unmodeled dynamics (generator and turbine). Simulations using the wind turbine simulator FAST and experiments on a 7.5-kW real-time simulator are carried out for the validation of the proposed high-order sliding mode control approach.Index Terms-Control, doubly fed induction generator (DFIG), second-order sliding mode (SOSM), wind turbine (WT).

AC-Chopper-Based Inrush Current Suppressor in a Wind Power Generation System with Squirrel-Cage Induction Machines

“…The total cumulative capacity of wind power generation systems (WPGS) had reached 486.8 GW in 2016 [1]. Many papers focused on WPGS have been published [2][3][4]. Squirrel-cage induction machines (SCIMs) are already used and installed because of their reliability and low cost.…”

Robust Sliding Mode Control of Permanent Magnet Synchronous Generator-Based Wind Energy Conversion Systems

“…In recent years, as WECS have moved away from the doubly-fed induction generators (DFIGs) and more towards permanent magnet synchronous generators (PMSGs), even further emphasis has been placed on efficient control strategies due to the high price and complexity of typical aerodynamic control systems [6]. Using PMSGs over DFIGs renders higher reliability, greater efficiency, a larger energy to weight ratio and an improved power factor to wind energy conversion systems (WECS) [7,8].…”

Direct Torque Control of Saturated Doubly-Fed Induction Generator using High Order Sliding Mode Controllers

“…As deduced from literature, many workers investigate the DFIG from diverse aspects. However, in these works, many simplifying hypotheses are considered in the modelling of the DFIG, with the neglect of magnetic saturation being the most important as in [1][2][3][4][5][6][7][8][9][10]. However, the phenomenon of saturation is present in all electrical machines.…”