4th year Electronic Engineering
The aim of this project is to investigate if efficiency of
power delivered from a domestic PV installation can
be improved by supplying such DC load through a DC
bus instead of through an AC grid connection.
Progress till date
Review and research on PV panels characteristics and
Review of PV inverters (including MPPT).
Review of power consumption of a range of DC loads.
Spice simulation of AC/DC converter such as full wave
PV panels are devices that convert solar energy directly
Consists of semiconductors poly crystalline silicon and
Light is absorbed by semiconductors which cause
electrons to move resulting in current.
Solar cell model with current source and diodes.
Efficiency is generally between 6 and 20%.
Fossils fuels use to be main source of energy for
The use of PV panels is not viable due to high cost of
installation and upkeep of PV modules.
Nowadays PV systems are becoming a truly viable
option for everyone.
Used for DC/AC conversion
Three different types of inverters: stand alone, grid tie
and battery backup inverters.
Stand alone – draws DC energy from batteries charged
by PV arrays. Battery back up –draw energy from
battery and provide back up power during utility. Grid
tie – designed to shut down automatically upon loss of
utility supply for safety reasons and do not provide
Solar inverters uses MPPT to deal with PV arrays.
Maximum power point tracking
High efficiency DC/DC converter converts power by
PV cells to voltage or current depending on what it is
Used to get the maximum power from PV arrays.
Advantages is that MPPT regulators can be used
during cold and cloudy weather.
Can be used with or without batteries.
Power consumption of DC loads
MPPT I-V characteristic
Full Wave rectifier