Improving the Efficiency of Direct Flux and Torque Control Technology for Doubly-Fed Induction Generator With a Robust Control Using Modified Super-Twisting Algorithms

Abstract

A robust direct flux and torque control (DFTC) technique of a doubly-fed induction generator (DFIG) for wind turbine applications (WTA) is presented in the paper. The main advantages of traditional DFTC control method are its simple structure, robust technique and good dynamic response compared to the field-oriented control (FOC). The use of a classical hysteresis comparator and a predefined lookup table will inevitably lead to select a nonoptimal rotor voltage vector in terms of reducing rotor flux errors, harmonic distortion (THD) current, and electromagnetic torque undulations. In this research work, a new approach of DFTC technique of DFIG based modified super-twisting algorithms (MSTA) and modified space vector modulation (MSVM) is developed by replacing the traditional lookup table and two hysteresis comparators. Theoretical principles of this method are presented along with simulation results. Analysis of DFTC-MSVM control scheme based MSTA controllers have been done in MATLAB/ Simulink environment. The machine (DFIG 1,5MW) is tested in association with a wind turbine. Simulation results are presented. The proposed DFTC control technique takes full advantage and the electromagnetic torque regulation objective of DFIG is confirmed by the numerical simulation results compared to the traditional DFTC control technique.

Using Feedback Control to Control Rotor Flux and Torque of the DFIG-Based Wind Power System

“…In wind systems, the DFIG generator is widely used because of its durability and ease of control. It is ideal for variable wind speed conditions [6]. In addition, this generator is characterized by less maintenance than other generators, such as DC generators.…”

“…This technique was used to control the doubly-fed induction generator (DFIG) [1], asynchronous motor (AS) [2], multi-phase synchronous motor [3], multi-phase induction motor [4], and synchronous motor [5]. This method has several problems, including fluctuations in rotor flux, torque, and current [6].…”

Amelioration Effectiveness of Torque and Rotor Flux Control Applied to the Asynchronous Generator for Dual-rotor Wind Turbine using Neural Third-order Sliding Mode Approaches

“…On the other hand, the DTC strategy with fractional-order second-order sliding mode approach reduces the ripples in the torque, current, and rotor flux compared to the DTC strategy with the traditional second-order sliding mode approach. A new method for DTC control has been proposed based on the modified super twisting algorithm [32]. This new DTC method is a modification of the DTC-PI method, where PI controllers are replaced by modified super twisting algorithms.…”