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Voltage Regulation in DC Microgrids in Superimposed Frequency Droop Method

Jafari Matehkolaei, Mohammad | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52305 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Mokhtari, Hossein
  7. Abstract:
  8. Environmental problems and limitation in fossil fuels have increased the application of renewable energy sources (RES) and distributed generations (DG). Due to the DC nature of most loads and DGs, DC microgrids provide a suitable structure to integrate different kinds of DGs and loads. Undesirable voltage regulation and poor power sharing among the sources in conventional voltage-based control methods are solved by the superimposed droop frequency method. However, the superimposed droop frequency scheme suffers from three major problems which are (i) instability in terms of load variation, (ii) limitation in the system maximum loading which is due to the limitation in the transferred reactive power, and (iii) poor voltage quality of the buses due to the injection of AC voltage to the main DC microgrid. In this project, the effects of the grid parameters and its control systems on the performance of the system are analysed, and an optimum range for the injected AC voltage frequency is obtained. Then, two novel adaptive droop characteristics are introduced to enhance the system stability and its loading condition. Moreover, a new adaptive amplitude of the injected AC voltage approach is proposed to improve the system stability and loading condition. The performance of the proposed schemes is evaluated by different simulation studies in MATLAB/SIMULINK environment
  9. Keywords:
  10. Renewable Energy Resources ; Distributed Generation ; Direct Current Microgrid ; System Stability ; Voltage Quality ; Voltage Regulator ; Superimposed Frequency Droop Method

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