Title page for etd-0728117-134259


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URN etd-0728117-134259
Author Yin-Chih Chen
Author's Email Address No Public.
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Department Electrical Engineering
Year 2017
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Optimal Design and Control of Interconnected Transformers for Photovoltaic Generation Systems Considering Reliability Criterion
Date of Defense 2017-08-23
Page Count 90
Keyword
  • Photovoltaic Generation System
  • Genetic Algorithm
  • Scenario Reduction
  • Light-load Conversion Efficiency
  • N-1 reliability criterion
  • Abstract Photovoltaic Generation System (PVGS) can be divided into small-scale and large-scale PVGSs. A small-scale PVGS is composed of photovoltaic panels and inverters and is directly interconnected to loads or low-voltage power grids. A large-scale PVGS is composed of many small-scale PVGSs and then is interconnected to high-voltage power grids by transformers. The PVGS devices are usually operated at light loads due to the output characteristic of PVGS. The transformers have a poor light-load conversion efficiency; therefore, it will cause significant energy loss for a large-scale PVGS in the long run. In addition, PVGS output is mainly affected by solar irradiances that are not continuous and rapid changes, the PVGS output is difficult to accurately predict too.
    An optimal design and control of interconnected transformers for PVGSs considering reliability criterion is proposed in this thesis. A modified scenario reduction method is adopted in this thesis to find out the representative data patterns of PVGS outputs. The proposed scenario reduction method can be used to reduce the data patterns within acceptable accuracy; therefore, the analysis speed and accuracy can be improved. To prevent the interconnection failure of PVGS due to a single transformer fault, an optimal design and control of interconnected transformers for PVGSs based on genetic algorithm considering N-1 reliability criterion is implemented. With the proposed design and control, the number and capacity of transformers can be determined. The interconnected transformers can then be scheduled to enhance the light-load conversion efficiency of PVGSs. Simulation results show that 0.6% conversion efficiency improvement can be realized for a PVGS with rated capacity of 3200kWp by the proposed optimal design and control of interconnected transformers. PVGSs with a total rated capacity of 20GWp will be installed in Taiwan in 2025. If the average daily power generation is about 80GWh, then the generation increases of 0.48GWh and 175.2GWh can be obtained daily and yearly respectively. Using the wholesale price of 4.4098 NTD/kWh for PVGS in 2017 in Taiwan as an example, the additional benefit of annual electricity sales is about 7.73 billion NTD.
    Advisory Committee
  • Shun-Chung Wang - chair
  • Yi-Hua Liu - co-chair
  • Tzung-Lin Lee - co-chair
  • Kuo-Lung Lian - co-chair
  • Jen-Hao Teng - advisor
  • Files
  • etd-0728117-134259.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2017-08-29

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