Robust Control of Doubly Fed Induction Generator Based on Direct Field Oriented Control

Abstract

This paper aims to develop, evaluate, and simulate a wind energy conversion system (WECS) based on a Doubly Fed Induction Generator (DFIG) coupled to a wind turbine in order to solve the fluctuating nature of wind speed. A wide range of wind speed fluctuations is possible with a Doubly Fed Induction Generator (DFIG) due to its ability to handle a wide range of rotation speed variation. Direct Field Oriented Control (DFOC) has been frequently used to decouple the active and reactive power control. Enhancing performance can be attained directly using controllers such as Proportional Integral (PI). However, this kind of controller heavily depends on parameter variations and frequently has difficulty dealing with nonlinear dynamics. Sliding Mode Control (SMC) provides robust performance. This work presents a comparative analysis between Proportional Integral (PI) control and Sliding Mode Control (SMC) in (DFOC) of a DFIG; the performances of both controllers are examined in terms of rapidity, precision, robustness, and power quality under parameter variations and strong disturbances. The findings confirmed that integration of SMC in DFOC improves robustness and power tracking even under uncertain conditions, whereas PI control allows good performance only under nominal conditions.