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Design and Analysis of DC-DC and DC-AC Photovoltaic Converter

Sadeghpour, Danial | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51609 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Atarodi, Mojtaba; Zolghadri, Mohammad Reza
  7. Abstract:
  8. Over the past decade there has been dramatic increase in fossil fuel’s usage; As a consequence, world now faces problems such as: air pollution, climate change, global warming and ozone layer depletion. In addition, depletion of the fossil energy resources is growing as a serious issue. Renewable energy(RE) sources are the most promising solution to these problems. Global investment in clean energy was increased by 16% in 2014 and solar power is anticipated to become the world’s largest source of electricity by 2050 .The German government has planned to achieve a goal of 8 percent renewables for gross power consumption by 2050 .RE is still more expensive than traditional one and faces a major problem: storage. Despite these factors limiting the growth of RE, currently, the share of modern renewable energy sources in the net energy consumption is estimated to be 10.3% worldwide. One of the growing technologies in RE is the Photovoltaic systems(PVs). According to the total cost of generating solar power has already reduced by 75 percent from 4$ to 1$ per W. PVs are now considered as one of the most reliable, clean, emission free and low maintenance power sources. High gain DC/DC converters has pivotal role in renewable grid connected systems due to low voltage of PV arrays, fuel cells, etc. Traditionally DC/DC converters are controlled by two methods:1-Pulse width modulation 2-Frequency variant modulation. PWM controlled converters are categorized to isolating and non-isolating converters. Transformer-less converters have been subject of research in the last decade due to their high efficiency, low stress voltage of switches and diminished electromagnetic interference (EMI). Well-known non isolated converters such as buck, boost, buckboost and cuck converters cannot guarantee high regulated output voltage unless they work under extreme duty cycle (near unity) conditions, which causes increased conduction loss, reverse recovery loss, EMI noise and destructive voltage spikes on power switches. Disadvantages of PWM converters has paced the development of high gain and efficient structures with low duty cycle such as: Multilevel, interleaved, switch cap, coupled inductor and voltage lift converters. The above mentioned structures have the properties which make them suitable for certain applications
  9. Keywords:
  10. DC to AC Converter ; Direct Current to Direct Current (DC to DC)Converters ; Step Up Transformer ; Solar Energy ; Gain Cell ; Photovoltaic System ; Renewable Energy Resources ; Pulse Width Modulation (PWM)

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