Computer Simulation and Analysis of A Doubly Fed Induction Generator with A One Side Directly Connected to The Grid

Abstract

Doubly fed induction generator (DFIG) is one of the most complex electrical structures for a power generating system (such as wind turbine and small hydro power). This paper proposes theory calculations, computer simulation and analysis structure of a DFIG with only one side connected to the grid. The stator of wound rotor induction generator (WRIG) is connected directly to the grid, and the rotor is controlled by a converter connected to an ideal battery. The theory calculation results provide the fundamental information for the initial stages of engineering design both in term of separate components (electrical machine, electronic converter) as well as the whole entire generating system. These properties and calculations determine the composition, technical implementation of the components in the system and the interaction between them. The theory and computer simulation results of a 160 kW WRIG system is also presented to prove the feasibility of the proposed system and method.