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Performance Improvement of Maximum Power Point Tracker in Grid-Connected Photovoltaic Systems

Mohammadian, Hossein | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44096 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Parniani, Mostafa
  7. Abstract:
  8. Increase in growing concerns over environmental pollution and depletion of fossil fuel resources motivate the need for cleaner energy technologies and stimulate research in facilitating renewable energy systems. In recent years, photovoltaic systems have attracted great attention since they remove the need for energy storage systems and intermediate processess for energy conversion. However, high capital cost, low efficiency and low energy density per area of these systems, as compared with other technologies hinder its industrial use. To surmount these bottlenecks and improve technical performance of PV systems, it is crucial to optimize configuration of convertor connection and to improve it’s control performance. In this thesis, we first survey the converter topologies of PV systems. According to this study, the most promising configuration is module level convertor. But at high power ranges, this method is not justified economically, and team configuration is the better option, considering it’s higher reliability and efficiency. Maximum power point tracker should be considered as the most significant controller of PV system. The maximum power point tracking of photovoltaic array is highly sensitive to the non-uniformity of insolation in partial shading condition and it’s patterns. This problem occurs very often and causes notable losses and increases the period of earning back the investment. In this project, a two-stage method has been developed to track the optimal power point. The method is shown to have suitable steady state and transient response and tracking reliability in all conditions
  9. Keywords:
  10. Grid Connected State ; Solar Cells ; Photovoltaic System ; Converter Configuration ; Maximum Power Point Tracking (MPPT) ; Partial Shading Condition

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