Control of Brushless Doubly Fed Reluctance Drive for Wind Energy Conversion Systems

Abstract

Brushless doubly fed reluctance generators (BDFRG) is one of attractive alternative generator types to the traditional and most commonly used doubly fed induction generator (DFIG) type due to its higher reliability, and lower maintenance cost. In addition, the BDFRM is capable to work in special environments such as offshore wind generation due to absence of slip rings which is not the case in DFIG. Keeping the same cost advantage of DFIG as its rival of using partially rated power electronics. This thesis explains the construction and theory of operations of BDFRG and its different modelling techniques starting with the ABC detailed model using winding function theory, space vector dynamic model in the stationary (α-β) frame, and finally space vector dynamic model using two arbitrary rotating frames (ω) and (ω_r-ω). Simulation studies using MATLAB/SIMULINK are presented under different operating conditions to test the performance of these different models.