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Micro-Grid and distributed energy resources

Battery Status Application July 16, 2013 Daniel Rendon REU Program Summer 2013 Dr. D. Wetz Greg Turner. Micro-Grid and distributed energy resources. What is a Micro-Grid? What energy sources power the micro-grids? Solar Panels Wind Turbines Fuel Cell Goal for the Micro-Grids

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Micro-Grid and distributed energy resources

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  1. Battery Status ApplicationJuly 16, 2013Daniel RendonREU ProgramSummer 2013Dr. D. WetzGreg Turner

  2. Micro-Grid and distributed energy resources • What is a Micro-Grid? • What energy sources power the micro-grids? • Solar Panels • Wind Turbines • Fuel Cell • Goal for the Micro-Grids • Program a smart micro-grid • Reduce the dependence on fossil fuels for energy production • Reduce cost of energy

  3. Micro-Grid Layout Micro-Grid 3: Load Wind Turbine Solar Panels Charge Control Charge Control Inverter AC Bus DC Bus 24V 120Vrms 60 Hz Batteries Two 12V batteries in series Diesel Generator MG2 MG3

  4. Renewable Energy Sources

  5. Hall Effect Sensors Sensor Specifications: Voltage – Current Relationship is Linear Full Scale: 4V translate to 50A

  6. Project Overview • Purpose: • Show status of batteries in order to determine how to manage the micro-grid • Source of decision making for smart micro-grid • Possible Statuses of batteries: • Charging (indicated by a negative current from the HES) • Supplying (indicated by a positive current from the HES) • *Fully charged and renewables are powering load (current = 0)

  7. Battery Status App. • Lab View • Compact RIO • FPGA (Sampling Speed: capable of taking one sample every 20us) • FIFO • Programming: • Reading voltages from the HES • Convert those voltages to currents using a linear relationship • Those currents tell us the live state of the micro-grid • Used the FPGA. Sampling speed a problem? • Collect the current going in or out of the batteries every 1-4 minutes. • Convert that current to charge and calculate the current state of the batteries.

  8. Lab View: Front Panel and Block Diagram Loop where the status of the battery is calculated every 1-4 minutes.

  9. Conclusion • Battery monitor is the first step in programming the smart micro-grid. • Final Goal: Smart micro-grid • Program the micro-grid to sell power to utility and calculate how much power you can use in order to obtain a net zero price. • Inform the user with time when critical decisions are to be made.

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