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Control Strategy of Fault Current Limiting Phase Shifted DVR with RSC Dual Control Strategy for LVRT in DFIG

Sheena Latif, Savier J. S.

Abstract


ABSTRACT

DFIG is the most popular Type 3 variable speed generator used for wind power extraction. The use of partially rated power electronic converters at the rotor side makes the DFIG highly sensitive to grid voltage disturbances. Occurrence of unsymmetrical faults at the stator side of DFIG introduces positive and negative sequence components in the rotor voltage and current. Unlike conventional FOC of RSC, a detailed control of both the sequence components is to be provided by the RSC during asymmetrical faults. Homogenous components present in the stator flux has to be reduced before RSC control can be enabled during LVRT. A Phase-Shifted Dynamic Voltage Restorer (PSDVR) is proposed in this paper for aiding the RSC to ride through homogenous rotor overcurrent during severe voltage dips. The DVR mode of PSDVR action ensures a safer reduction of homogenous rotor current component. This paper presents a theoretical simulation-based monitoring approach of RSC dual control supported with PSDVR in MATLAB/SIMULINK environment. Results justify the effectiveness of the proposed PSDVR method in supporting the RSC control during voltage unbalances occurring at the stator. Comparison of the proposed method with the existing topology also ensures stable operation of DFIG without the need for triggering crowbar circuitry. RSC dual sequence control enables negative sequence control and associated rotor current harmonics reduction.


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References


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