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Design and Implementation of a Direct AC-AC Converter with Wide Input-Output Voltage Range

Mokhtari, Mohammad Hadi | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57577 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Zolghadri, Mohammad Reza
  7. Abstract:
  8. The annual degradation in power quality causes significant losses to electricity consumers, particularly in sensitive industries. One of the most critical challenges associated with power quality is the voltage sags and swells in the grid. voltage sags and swells in the grid pose a major challenge, potentially damaging equipment and disrupting production, which can increase the costs of the final product. Moreover, the AC nature of grid voltage highlights the importance of developing AC-AC converters to mitigate issues arising from grid voltage sags and swells. The primary goal of the employed converter is to compensate for voltage amplitude, without concern for frequency control. Therefore, direct AC-AC converters, which do not require a large DC link, can be effectively used in this application. By eliminating the DC link electrolytic capacitor in these converters, both the cost and failure rate of the converter are significantly reduced. Additionally, these converters generally produce higher quality output waveforms compared to indirect converters, resulting in the need for smaller output filters. In this research, an effort was made to first define the problem and extract the required capabilities of the converter for the intended application, including continuous output voltage control, the ability to compensate for voltage sag/swell in the grid over a wide range, and ensuring the design is both operationally feasible and economically viable. A single-phase direct AC-AC converter with a wide input-output voltage range was proposed for grid voltage sag/swell compensation. Following this, after analyzing the converter's performance, the design equations were presented. To evaluate the closed-loop performance, the proposed converter was modeled, and an appropriate controller was designed. Finally, the results were validated through simulation and the implementation of a laboratory prototype
  9. Keywords:
  10. Dynamic Voltage Restorer (DVR) ; Power Quality ; Voltage Sag ; Over Voltage ; Alternative Current/Alternative Current (AC/AC)Converters

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