The strategy to improve both efficiency and power quality of grid-connected wind turbine generator systems (WTGs) are presented. WTGs efficiency is improved by developing a variable speed control to obtain maximum power at all wind speeds. Variable speed control based on Adaptive Type-2 Fuzzy Sliding Mode Control (AFSMOC) is proposed by employing Very Sparse Matrix Converter (VSMC). Type-2 fuzzy system is used to improve the robustness of sliding mode control. VSMC can provide low harmonics in line current, so the power quality problems can be minimized. The simulation results shows that the AFSMOC can regulate the generator speed at optimum Tip Speed Ratio (TSR) with maximum error 2.5 rpm, so that the maximum power can be obtained at all wind speeds. VSMC also provide good performance with Total Harmonic Distortion (THD) of voltage 0.35% and THD of current 6,82%.

Original languageEnglish
Pages (from-to)668-676
Number of pages9
JournalInternational Journal of Renewable Energy Research
Issue number3
Publication statusPublished - 2015


  • Adaptive type-2 fuzzy sliding mode control
  • Variable speed control
  • Very sparse matrix converter
  • Wind turbine generator


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