Chatter-Free Nonlinear Control of DFIG Power for Wind Conversion System

Abstract

In this paper, a robust nonlinear controller based on sliding mode control strategy is adopted for a variable-speed wind energy conversion system with a double-fed asynchronous generator (DFIG). Firstly, field-oriented control law based on PI controllers has been introduced. However, wind turbines components work as nonlinear systems where electromechanical parameters change considerably; thus, a SOSMC with a simple function to smooth control signals is introduced, the aim of the proposed controller is to contributes with some important features such as power fineness, minimize the chattering, ameliorate respond time and deal with grid requirements. Matlab tests are introduced in an attempt to confirm the effectiveness of the proposed control.

Power Strategy Scheme of a Standalone Wind Energy System

“…For this reason, it is difficult to limit these perturbations when using a linear control technique like the classical PI control. Therefore, researchers used robust control strategies for such as Sliding Mode Control, smart control or adaptive algorithms [9], HOSMC [10,11]. In this present paper, SOSMC is suggested because it has many several features like:…”