Control of a doubly fed induction generator in a wind turbine during grid fault ride-through

Abstract

Summary form only given. This paper analyzes the ability of a doubly fed induction generator (DFIG) in a wind turbine to ride through a grid fault and the limitations to its performance. The fundamental difficulty for the DFIG in ride-through is the e.m.f. induced in the machine rotor during the fault, which depends upon the d.c. and negative sequence components in the stator flux linkage and the rotor speed. The investigation develops a control method to increase the probability of successful grid fault ride-through, given the current and voltage capabilities of the rotor side converter. A time domain computer simulation model is developed and laboratory experiments are made to verify the model and the control method proposed. Case studies are then performed on a representatively sized system to define the feasibility regions of successful ride-through for different types of grid fault.