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Development of Smart Charger in Standalone Solar Inverter

Azad, Hassan | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47792 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Rajabi Qahnuyeh, Abbas
  7. Abstract:
  8. The advantages of using solar energy, including absence of environmental pollution, renewability, availability, ease of installation and use, and has attracted much attention of researchers. Expanding the use of solar energy in remote areas where national grid coverage is weak, makes off-grid inverter vital role clear. The swinging nature of solar energy requires the use of electrical energy storage and battery charger for optimum energy extraction in a technically and economically manner. The aim of this project is to develop a Smart Charger in Standalone Solar Inverter. Charger circuit design has been done in order to accommodate a 4kW inverter. Selected Charger topology is the bidirectional Buck/Boost DC/DC converter with a capacity of one kilowatt. The Standalone system has been developed in three Stages. The first stage is two individual Boost Converters with the ability to extract maximum power from photovoltaic panels ,each with the capacity of two kilowatts by using the P&O method, the second stage is a 4kW inverter with simultaneous control of voltage and frequency to produce an AC voltage with respect to the Standard IEC61727 and the third Stage is the charger with automatic transmission from charging to discharging with lead acid batteries (manufactured by VoltaMax) with respect to the noise standard CISPR22, by achieving an average downtime of a million hours with respect to the standard MIL217 and efficiency 92% . The innovation of present work is adopting strategies for the proper functioning of the various supervisory control of the Standalone System. The main idea is to control and stabilize the DC link voltage. Off-grid solar system simulation in Simulink/MATLAB is done; the simulation results have been satisfactory in accordance with the control objectives. Laboratory sample Charger implementation is done and the results of perturbation equivalent to ten percent of the rated power are evaluated. Implementing control algorithms has been done by the processor Texas Instruments DSP TMS320F28335. Laboratory test results confirmed the successful control algorithms to stabilize the DC link voltage
  9. Keywords:
  10. Solar Energy ; Lead Acid Battery ; Bidirectional Converter ; Solar Off-Gird System ; Smart Charger ; Bidirecticnd Buck/Boost Converter ; Power Flow Control

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