Wind energy integration: Dynamic modeling and control of DFIG based on super twisting fractional order terminal sliding mode controller

Abstract

The stator voltage and frequency variations of doubly fed induction generator (DFIG) make it impossible to maintain direct connection to the power grid Moreover, uncertainty, inequity, and external disturbance are common in a conventional grid integrated wind energy conversion system (WECS). Considering these abnormal effects, it is imperative to introduce a high-performance back-to-back voltage source conversion and control system for maximum power transfer from DFIG to power grid. This article is divided into two parts: first, multilevel conversion using a three-level neutral point clamped (3L-NPC) converter is used to keep the DC link voltage (Vdc) stable; Second, On the rotor-side converter (RSC) and grid-side converter (GSC) of a 2MW DFIG-based WECS, a non-linear, robust, rattling super twisting terminal sliding order sliding mode control system (ST-FOCSMC) was employed. The Lyapunov stability set is utilized to ensure the suggested control system’s stability. Simulation in the Matlab/ Simulink environment has been used to validate the efficiency of the multilevel conversion and control system. The proposed multilevel converter outperforms traditional converters in terms of providing balanced voltage. Furthermore, In normal operating mode, the superiority of prescribed controller is verified by comparing it with proportional integral (PI) controller in terms of rotor speed and current output.