Journal of Electrical Engineering : Volume 17 / 2017 - Edition : 2

APPLICATION OF BRIDGE TYPE FAULT CURRENT LIMITER FOR FAULT RIDE-THROUGH CAPABILITY ENHANCEMENT OF DFIG BASED VARIABLE SPEED WIND TURBINES

Authors:
Kumaraswamy Lella
N. Ram Mohan
Domain:
electrical machines and drives
Abstract:
Nowadays, wind energy is more prominent option to generate electrical power compared to all other renewable sources. However, their integration into the electrical grid is difficult because of grid code requirements. The Fault Ride Through (FRT) is an important issue related to wind energy conversion systems (WECS).For the power generation by wind uses different types of wind generators like synchronous and induction generators. Currently, the doubly-fed induction generator (DFIG) based wind turbine is most popular technology to generate electric power due to its variable speed operation and to capture more wind energy. According to the grid code requirements, FRT capability augmentation of DFIG based wind turbine is a very important research topic. Doubly fed induction generator-based wind turbines are more affected by the grid faults because its stator windings are directly connected to the electrical grid. However, the wind generators stay connected to the grid during fault as per the grid code requirements. In this work, a bridge type fault current limiter (BFCL) is proposed to enhance the FRT capability of DFIG based wind turbine with the test system considered. The test system consists of a 9MW doubly fed induction generator-based wind turbines connected to an infinite bus through step-up transformers and a double circuit transmission lines. A three phase to ground (3LG) fault is applied to one of the transmission lines to investigate the FRT capability augmentation of
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