Presentation on theme: "DC bus for photovoltaic power supplying computing loads"— Presentation transcript:
1 DC bus for photovoltaic power supplying computing loads Vincent Flaherty4th year Electronic Engineering
2 Project AimsThe 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 DateInvestigation and PSPICE simulation of AC/DC converter.Full Wave RectifierFlyback 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 [Figure taken from cnet.com] Power ConsumptionThe average power consumption for a range of electrical devices which drive DC loads.[Figure taken from cnet.com]ApplianceConsumptionLCD Television213 WattsPlasma Television339 WattsPlaystation 3197 WattsXbox 360187 WattsAverage PC78 WattsNintendo Wii19 WattsWireless Router7 Watts
7 PV Inverters Used to change DC electricity to AC electricity. 2 main types used with PV systems.Grid-tie inverters.Battery backup invertersSolar 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.
11 Flyback ConverterDC/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.