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Improvement of Steady State and Dynamic Performance of Grid-connected Photovoltaic Power Generation Systems

Ghasemi, Mohammad Amin | 2016

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 48661 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Parniani, Mostafa
  7. Abstract:
  8. Global growth of electrical energy consumption and various limitations on the use of fossil fuels, such as environmental problems, rising prices and their limited available resources, have resulted in growing interest and investment in the usage of renewable energy generation, especially photovoltaic (PV) systems. Although the off-grid operation of PV systems was its dominant operation form in the past, proliferation of these systems has made the grid-connected operating mode widespread in recent years. However, their grid connection causes technical problems which need to be resolved. This thesis studies and analyses the steady state and dynamic operation of PV systems in grid-connected mode, and improves their performance characteristics in different aspects. Briefly, the operation and control of a grid-connected PV system comprises three main issues, including: maximum power point tracking of the PV array, conversion of the extracted current and power to the AC quantities for injection to the grid, and finally, its stable and satisfactory operation considering dynamic and static interactions with the grid. All of the mentioned issues are considered in this thesis, and proper methods are presented to improve the system performance in all sub-systems. Specifically, 1) A new maximum power point tracking algorithm is presented for the situation that the PV array subjected to the partially shaded condition, a situation that the conventional algorithms are not able to track the main maximum power point, 2) Control functions of the voltage source inverter are analyzed and further developed to adjust the active and reactive power injected to the grid and the DC link voltage, using two type of filters, i.e. L and LCL type, for grid integration of PV system. The analyses and design considers all the practical details and the dynamic interaction of the system with the grid. 3) Finally, voltage rise in distribution feeders with dispersed and renewable power generation is shown to be a main limiting factor for the increase of grid-connected PV systems capacity, and novel algorithms and remedies are proposed to resolve this problem
  9. Keywords:
  10. Photovoltaic Array ; Maximum Power Point Tracking (MPPT) ; Reactive Power Control ; Grid Connected State ; Voltage Source Inverter ; Photovoltaic (PV) Power Generation ; Active Power Control ; Voltage Rise Prevention

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