Post on 18-Mar-2018
transcript
Introduction
General System
Existing System
Proposed System
Stepper Motor And Driver Theory
Advantages and Disadvantages
General system
Existing system
Proposed system
A non-pressurized cooling system was
developed for cooling the panels with least
amount of water and energy.
It is possible to cool and clean the PV panels
using the proposed cooling system in hot and
dusty regions.
The basic idea of a Solar cell is to convert light
energy into electrical energy.
Electrical energy is stored in electromagnetic
fields which in turn can make a current of
electrons flow
Photovoltaic cells convert sunlight directly to
electricity.
major defect of low efficiency.
best achieved sunlight conversion rate
Solar module efficiency is around 17.4%
power drop as the silicon temperature increases due
to the characteristics of the crystalline silicon used in
a solar cell.
The model performance was then conceptually
evaluated and experimentally verified
Works well under diffused sunlight, less sensitive
to angle of incidence.
Can be made fully transparent, can have a lot of
aesthetic applications.
Bifacial, absorbs light from both faces, can be inverted.
Manufacturing costs much cheaper than the
commercially available PV silicon cells.
Also works at high temperature, owing to the thin
conducting film that radiates internal heat.
SUNPHOTOVOLTAIC
CELLCONTROLLERS OUTPUT
SOLAR TRACKING
UNIT
OPTICAL
FILTERS
COOLING UNIT
A controller circuit which consistof mainly
three components.
Solar tracking unit
Cooling unit
Optical fillers
A solar tracking unit which tracks the Sun
hardware implementation of Solar tracking system
Solar panel in a fixed orientation will lose 75% of the energy in the morning and evening
rotating the panels to east and west can help recapture these losses
This solar tracking unit has a LDR circuit
fitted on the panel
mechanical setup will move the panel in such a direction to provide better solar isolation
device which has resistance which varies according to the amount of light falling on its surface
It is made using Semiconductor cadmium sulphide(CdS)
A light dependent resistor work on the principle of photo conductivity
PIC 16F877 uses 14 bits for instructions which allows for all instructions to be one word instructions
It is also typical for Harvard architecture to have fewer instructions
is the cooling unit for the solar panel; this unit
consists of LM 35
temperature sensor interfaced with PIC and place
over the panel
This water not only cools the panel but also
cleans it
After cooling the panel again the temperature is
sensed and the cycle is repeated
Operating and maintenance costs is low
PV cells produce no noise at all
do not pollute the environment
easy to install on rooftops or on the ground
without any interference
required additional equipment (inverter) to
convert DC-AC
equired batteries for storage purpose
Initial cost is high
Solar energy has intermittency issues
Depended upon weather
The objective of this Study is to enhance the
efficiency of Photovoltaic panel
A low cost solar tracking have also been
incorporated to maintain better solar
insolation
It is possible to cool and clean the PV panels
using the proposed cooling system
(1). Martin P. Bates, 'Interfacing PIC
Microcontrollers- Embedded Design by
Interactive Simulation', Elsevier, 2006.
(2). Moharram.K.A., M.S. Abd-Elhady,
H.A.Kandil , H.El-Sherif (2013) “Enhancing
(3). Rustemli.S, Dincer.F. (2011) "Modelling of
Photovoltaic Panel and Examining