POWER QUALITY IMPROVEMENT IN GRID CONNECTED WIND ENERGY CONVERSION SYSTEM USING HYBRID FUZZY CONTROLLER


Author (s):

  1. D. Mamatha, Vishnu Institute of Technology, Bhimavaram, Andhra Pradesh, India
  2. Dr. Y.Sreenivasa Rao, Vishnu Institute of Technology, Bhimavaram, Andhra Pradesh, India, mamatha35@gmail.com

Abstract:

Renewable energy sources, which are expected to be a promising alternative energy source, can bring new challenges when connected to the power grid. Like conventional power plants, wind power plants must provide the power quality required to ensure the stability & reliability of the power system. While connecting wind turbine to grid it is important to understand source of disturbance that affect the power quality. In general voltage & frequency must be kept as stable as possible. This stability can be obtained by using FACTS devices. In this proposed scheme a FACTS device STATIC COMPENSATOR (STATCOM) is connected at a point of common coupling. The STATCOM will reduce the harmonics in the grid current by injecting superior reactive power in to the grid. However, in a wider sense Fuzzy Logic is almost synonymous with the theory of Fuzzy sets, a theory which relates to classes of objects with un sharp boundaries in which membership is a matter of degree. In this paper hybrid fuzzy logic controller is used which is the combination of PI and fuzzy controller for reducing the total harmonic distortion (THD) in source current of grid connected wind energy generation system.

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