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Design of High Frequency Auxiliary Power Supplies for 1500 Photovoltaic Systems with Voltage Equalization of DC Link Capacitors

Motahari, Mahdi | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58222 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Tahami, Farzad
  7. Abstract:
  8. With the rapid expansion of photovoltaic (PV) system applications and the increasing power capacity of solar inverters, the use of 1500 V DC links has become a common standard in the industry. However, employing such a high voltage level in the design of auxiliary power supplies poses challenges, including high voltage stress on switches and the need for voltage balancing across the series-connected DC link capacitors. In this thesis, an innovative auxiliary power supply topology, referred to as a centrally clamped series-input flyback converter with active clamp, is introduced. This topology provides zero-voltage switching (ZVS) by adding only one switch to the conventional series-input flyback converter [17], thereby improving performance and efficiency, reducing voltage stress on switches, and lowering their operating temperature. The proposed structure, through precise winding coupling and the use of resonant circuits, offers effective capability in balancing the voltage across the DC link capacitors. The performance of the converter has been evaluated both in simulation and experimental setups, and compared with two other conventional structures: the standard series-input flyback converter [17] and the series-input flyback converter with series diodes at the input. The results show that the proposed topology achieves an efficiency of 93%, with superior thermal performance, lower voltage stress, and higher reliability compared to previous designs
  9. Keywords:
  10. Photovoltaic System ; 1500 V DC Link ; Auxiliary Power Supply ; Active Clamp ; Soft-Switching ; Capacitors Voltage Balancing

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