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Abstract

The wind power penetration has been increasing significantly year by year. Most of the Wind Turbine Generators (WTGs) are designed with induction generators. The induction generator based wind farms have poor fault ride through capability and any system disturbance may affect the wind power generation. The disturbances are very common, if the WTGs are connected to weak grids. One such problem of frequent tripping has been encountered at Anthiyur substation in India. Subsequently, a power quality study has been undertaken in a 110/11KV substation at Anthiyur for examining the causes for tripping. From the study, it is found that frequent grid voltage disturbances have caused the tripping. Since the contribution of wind power is in predominant percentage, maintaining its stability becomes an important issue. A simulation based solution is proposed to improve the reliability of Doubly Fed Induction Generator (DFIG) based wind farms. In the proposed strategy, Dynamic Voltage Restorer (DVR) is used to compensate the grid voltage disturbances. The DVR can compensate the faulty line voltage and enhance fault ride through capability of DFIG wind farms for a stable operation as demanded in actual grid codes. Especially, vector control technique is utilizedhere to control the DVR. The proposed control scheme is very effective to protect the DFIG and DVR from disturbances and faults.

Keywords

DFIG grid fault Dynamic Voltage Restorer vector control fault ride-through of wind generators

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Dynamic Voltage Restorer for Fault Ride through of Doubly Fed Induction Generator — A Solution for a Case Study at 110/11KV Substation in India

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