A Single Machine Brushless DFIG for Grid-Connected and Stand-Alone WECS
Mahmoud A. Saleh
Department of Power Electronics and Energy Conversion Electronics Research Institute, Cairo, Egypt.
Mona N. Eskander *
Department of Power Electronics and Energy Conversion Electronics Research Institute, Cairo, Egypt.
*Author to whom correspondence should be addressed.
Abstract
In this paper a new design for brushless doubly fed induction machine for operation as generator in wind energy systems is proposed. This machine, named single machine- brushless doubly fed induction generator (SM-BDFIG) is composed of three main components; a regular three phase wound rotor induction machine, a power electronic converter, and a pack of rechargeable Lithium-ion batteries. The converter is mounted on the outer surface of a web reinforced hollow metallic (aluminum) or fiber glass cylinder. The battery packs are embedded in the inner part of the cylinder between the webs. The hollow cylinder is mechanically coupled with the induction machine on the same shaft. Therefore, all the three main components of the SM-BDFIG rotate with the same angular speed. A brief description and analysis of the proposed machine merits, parameters, and characteristics are given. The authors could provide the detailed designs of SM-BDFIG and the required testing facilities to the manufacturer who is ready to fabricate the first product of SM-BDFIG and facilitate their testing.
Keywords: WECS, DFIG, double-sided converter, Li-ion battery