OPERATIONS OF DFIG UNDER UNBALANCED AND DISTORTED SYSTEM
The interest towards renewable energy resources like wind and solar are increasing over a decade due to the concern over the nature, economic and long run operation and many such. Among all these type of sources, wind energy based renewable energy resource with doubly fed induction generator (DFIG) seems to be more promising due to low converter cost, better operation during distorted, unbalanced grid, better fault ride through and more over effective control of real and reactive power. However, such DFIG system faces challenges because of unbalanced voltage operation because load or grid disturbances or due to transmission line perturbations. This paper gives a rough idea of present literature survey about fault ride through strategies, power control and unbalanced and distorted DFIG operation. The paper also gives brief picture on the challenges of DFIG grid connected system and future scope for extending the research in these areas.
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