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Analysis and Improvement of Grid Voltage Quality Issues in Presence of High PV Penetration

Jafari, Mohammad Reza | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52989 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Parniani, Mostafa
  7. Abstract:
  8. Nowadays, concerns about the reduction of fossil fuels and environmental issues, have made renewable resources more important. Among these resources, photovoltaic (PV) systems are more popular than others, due to their environmental compatibility and unlimited availability of sunlight. Increasing the penetration level of PV systems in electricity networks presents various technical and control challenges such as voltage and frequency variations; and protection and harmonics issues. In this thesis, voltage rise problem due to reverse power flow in distribution feeders is discussed. This is one of the main obstacles to the expansion of these resources in distribution networks.Various solutions have been proposed to regulate the grid voltage and prevent overvoltage in these situations, such as grid reinforcement, use of OLTC transformers, reactive power control of PV inverters, storage systems or a combination of these methods. The current thesis utilizes OLTC transformer and reactive power capability of PV inverters as two available potentials for voltage regulation in distribution network. Coordination between OLTC controller and PV resources has been provided by decentralized control, which reduces the need for telecommunication infrastructures. Simulation results show that the proposed method keeps network buses voltage within the permissible range and reduces the number of tap operations significantly
  9. Keywords:
  10. Voltage Regulator ; Power Quality ; Distributed Generation ; Photovoltaic System ; Active Distribution System ; On Load Tap Chenger

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