Analysis of Protection Scheme for Grid Connected DFIG System under Symmetrical Fault Condition

Gunwanta Junghare, Prashant Debre, Akshay Kadu

Abstract


This paper deals with the protection scheme of Doubly Fed Induction Generator (DFIG) based wind energy conversion system (WECS) for Low Voltage Ride Through (LVRT). The ability of Wind Turbine to stay connected to the grid during voltage dips is termed as the low-voltage ride-through (LVRT) capability. During voltage dip, two major concerns comes into picture, first one is the overcurrent in stator and rotor circuits and other one is the dc link overvoltage. Both issues are dangerous to DFIG operation. The overvoltage in dc link and overcurrent in rotor circuit is dangerous for rotor converters, as less capacity of rotor converters is used in DFIG wind turbines. To prevent this situation dc chopper is inserted in dc link circuitry to regulate the dc link voltage and active crowbar is inserted in rotor circuit which helps to prevent the rotor circuitry from overcurrent.

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