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Designing, Simulating, and Testing the Power Subsystem for RAPID

Designing, Simulating, and Testing the Power Subsystem for RAPID. Neema Aggarwal Cooper Union Mentor: Jim Marchese August 8, 2013. MIT Haystack REU 2013. Outline. Introduction to RAPID 3 Power Subsystem Components Solar Panel Battery Charge Controller Python Power Model Simulation

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Designing, Simulating, and Testing the Power Subsystem for RAPID

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  1. Designing, Simulating, and Testing the Power Subsystem for RAPID NeemaAggarwal Cooper Union Mentor: Jim Marchese August 8, 2013 MIT Haystack REU 2013

  2. Outline • Introduction to RAPID • 3 Power Subsystem Components • Solar Panel • Battery • Charge Controller • Python Power Model Simulation • Demonstration • Test Bed • Summary

  3. Portable field units for conducting radio interferometry Consists of: • Antenna • LNA • Atomic clock • FPGA • Storage unit • Power subsystem

  4. RAPID • In order to produce large numbers of antennas, hardware must be efficient, reasonably sized, cost effective, shippable, etc… Advantages: • Independent • Reconfigurable • Transportable to ideal location for observations • Large number of baselines • Wide field • Wide frequency range To maximize portability, each unit must contain an easily transportable power supply

  5. Power Subsystem Contains: • Photovoltaic Panel • DC/DC Converter • Battery • Charge Controller

  6. Photovoltaic Panel Considerations: • Efficiency • Size/Weight • Cost SunPower E19 Grape Solar

  7. Battery 3 Types of Batteries: • Lead Acid • NiMH • Lithium Ion Selected for RAPID

  8. Charge Controller • Morningstar’s SunSaver PV System Controller SunSaver Charging Algorithm

  9. Power Model • Python simulation • Uses discrete time steps • Easily configurable for different load profiles, solar panels, and geographic locations

  10. Demonstration Load Profile: 5 hour experiment On 30 min, off 30 min [400,400,300,300,300] W/m2 [25,25,25,25,25] oC SOC = 13.5 A-hrs VBat= 13.2 V

  11. Power System Testing

  12. Data Example

  13. Summary • Important to get an idea of how the power system will perform before deploying the antennas • Utilize the python simulation as well as the test bed to get a sense of how feasible an experiment is • Better understand the solar panel and battery capacity needed to run RAPID • The model will continue to be developed as more variables become known

  14. Acknowledgements A special thanks to: • Jim Marchese • Will Rogers • Frank Lind • K.T. Paul • Phil Erickson and Vincent Fish • Colin Lonsdale • Haystack Observatory

  15. Thank You Questions?

  16. References • U. Boke, “A simple model of photovoltaic module electric characteristics,” in Proc. Eur. Conf. Power Electron. Appl., Sep. 2007, pp. 1–8. • Eric P. Usher and Michael M. D. Ross. Recommended Practices for Charge Controllers, Report IEA PVPS T3-05: 1998, CANMET Energy Diversification Research Laboratory, Natural Resources Canada, Varennes, Québec, August 1998.

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