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Design and Reliability Improvement of Auxiliary Power Supplies for Solar Inverters

Daneshvar Amoli, Amir Reza | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58894 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Tahami, Farzad
  7. Abstract:
  8. Today, the development of renewable-energy-based industries is considered an undeniable necessity. However, one of the major challenges faced by this emerging industry is the relatively low reliability of its systems. In general, the reliability of a system can be decomposed into the reliability of its constituent elements, one of which is the auxiliary power supply. Therefore, this thesis focuses on the auxiliary power supply of the converter, so that improving its reliability can contribute to improving the reliability of the overall system. In this research, considering the specifications of auxiliary power supplies, the voltage levels of the DC bus, and economic considerations, single-switch isolated topologies were selected for study. A comparison was then conducted among the flyback, active-clamp forward, quasi-resonant flyback, and active-clamp flyback topologies. The main idea was to employ soft switching as a means of improving reliability. In this comparison, a comprehensive reliability analysis of power electronic components was carried out based on common reliability handbooks, including FIDES 2023. Following the investigations and handbook-based calculations, the preferred topology is identified. Considering the combined criteria of circuit complexity, size, cost, and reliability, the quasi-resonant flyback converter is selected for implementation. Finally, by following a systematic project implementation methodology, the converter is designed and implemented accordingly. The electrical specifications of the converter are a maximum output power of 50 W, a nominal input voltage of 300 V, and an output voltage of 24 V. Based on the fundamental parameters used in reliability handbooks, component temperature is the most important factor affecting reliability. Considering this point and comparing the temperatures of the components, the hypothesis of this research is verified
  9. Keywords:
  10. Solar Inverter ; Reliability ; Soft Switching Inverter ; Quasi-Resonant Flyback Converter ; FIDES 2023 Handbook

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