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Reliability Incorporated Modeling and Analysis of Lead Acid Battery in Renewable Energy Systems

Hamedi, Amir Sina | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46171 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Rajabi Qahnuyeh, Abbas
  7. Abstract:
  8. Energy and environment crisis in past decades raised concerns about fossil fuels use and has accelerated renewable energy application in terms of solar electric, solar thermal and wind turbines. Due to the fluctuating nature in renewable resources, renewable electric power generation has a stochastic nature that makes it difficult to use by the electricity consumers. Energy storage plays a key role to put more control on renewable power generation.Lead-acid battery is a storage technology that is widely used in photovoltaic systems. Battery investment and maintenance costs account for a big part of photovoltaic system costs. Charging and discharging profiles of the battery has a great impact on reliability and failure rates of the battery and this issue need to be addressed clearly.This thesis is focused on modeling and analysis of lead acid battery application in renewable energy systems considering reliability. The battery operation and failure has been studied to determine battery failure modes. A model was used to determine battery aging due to the operational conditions. An approach has been presented to optimize the operation of a photovoltaic-battery system in which the degradation cost of battery was explicitly considered. The proposed approach is based on a two-step optimization procedure in which the optimal charging/discharging profile of the battery and the depreciation cost of the battery are determined.The proposed approach has been applied to a 4 kWp solar system. Results showed that the proposed approach is successful in determining optimal system operation. Applicability of the proposed approach in determining optimal system sizing and electricity pricing was also shown through numerical results.
  9. Keywords:
  10. Economic Optimization ; Lead Acid Battery ; Renewable Energy Resources ; Photovoltaic System ; Solar Energy ; Optimization ; Depreciation Cost

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