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DC bus for photovoltaic power supplying computing loads

DC bus for photovoltaic power supplying computing loads. Vincent Flaherty 4 th year Electronic Engineering. Project Aims.

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DC bus for photovoltaic power supplying computing loads

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  1. DC bus for photovoltaic power supplying computing loads Vincent Flaherty 4th year Electronic Engineering

  2. Project Aims • The aim of this project is to investigate if the efficiency of power delivered from a domestic PV installation can be improved by supplying such DC loads through a DC bus instead of through an AC grid connection.

  3. Progress to Date • Research of PV systems. • Review of power consumption of different loads. • Review of PV inverters.

  4. Progress to Date • Investigation and PSPICE simulation of AC/DC converter. • Full Wave Rectifier • Flyback Converter

  5. PV systems • PV modules convert sunlight to electricity. • Made from semiconductor materials. • General efficiency (6 – 20%) • An ideal solar cell can be modelled using a current source in parallel with a diode

  6. Power Consumption • The average power consumption for a range of electrical devices which drive DC loads. [Figure taken from cnet.com]

  7. PV Inverters • Used to change DC electricity to AC electricity. • 2 main types used with PV systems. • Grid-tie inverters. • Battery backup inverters • Solar inverters use procedures such as MPPT to deal with the PV array.

  8. MPPT • DC/DC converter functions as optimal load for a PV cell. • MPPT is used by solar inverters to get the most power possible from a PV array. • Can be used with or without batteries. • The benefits of MPPT regulators are greatest during cold, hazy or cloudy weather.

  9. Fullwave Rectifier • Used to convert AC to DC. • Most simple method of conversion. • Quite easily simulated using PSPICE.

  10. Fullwave Rectifier

  11. Flyback Converter • DC/DC converter with isolation between input and output. • Very similar to Buck-Boost converter. • Voltage ratios can be multiplied due to turns in transformer. • Can operate over a wide range of inputs.

  12. Flyback Converter

  13. Major Challenges • Finding circuit schematic for AC/DC adapter. • Effective simulation of Flyback converter.

  14. Next Steps • Finalisation of Flyback converter simulation. • Investigation and simulation of other DC/DC converters. (Buck, Boost etc.)

  15. Questions?

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