Mppt and mppt with pi converter based phtovoltic system

P&O ALGORITHM BASED
MPPT CONTROL OF
PHOTOVOLTAIC SYSTEM
Presented by:-
Madhu Bala

CONTENTS
• photovoltaic cell
• Solar cell , module, array
• Physical structure of cell, module and array
• Mathematical module of solar cell
• Modeling of solar cell
• Basic diagram of boost converter
• Perturb & observe algorithm
• Simulation module of PV system with and without
controller
• Result of simulation module with and without controller
• Result comparison
• conclusion

Photovoltaic cell
• also called solar cell, is an electrical device
that converts the energy of light directly into
electricity by the photovoltaic effect.
Solar Cell (PV)
Light Electricity

Solar cell, Module and Array?
• A single solar PV cell generates very tiny amount that is
around 0.1 watt to 2 watts. it is not practical to use
such low power unit as building block of a system
• A solar module is normally series connected sufficient
number of solar cells. One solar module can be rated
from 3 watts to 300 watts.
• Several solar modules are connected in series/parallel
to increase the voltage/current ratings. Solar panel is a
group of several modules connected in series parallel
combination in a frame that can be mounted on a
structure. The combination of such panels are called as
an SOLAR ARRAY.

Physical structure of cell , module and array

Advantage of Solar Energy
•Unlike conventional power, solar produces no
harmful emissions that hurt the environment.
•It's a clean.
•Consumes no fuel

DISADVANTAGES
• The main disadvantage of solar cell is the initial cost.
• Air pollution and weather can also have a large effect
on the efficiency of the cells.
• The silicon used is also very expensive and the solar
cells can only ever generate electricity during the
daytime.

Block diagram of circuit
Solar
panel converter
Load
MPPT
algorithm

Mathematical model of solar cell

MODULING OF PV SYSTEM
Where Ir-: solar irradiation (W/m2)
Ki-: Boltzmann constant = 1.3*10^-23 (J/K)
Then,
Q= electron charge=1.6*10^-19
[1]
[2]

Then,
Module circuit curcrent Ipv,
,
Then,
Module saturation current Io,
Ego=Energy band gap =1.1ev
Continue-:
[3]
[4]

Simulation diagram of equation[1]

Simulation diagram of equation [2]

Complete model of PV system
[1]
[2]
[3]
[4]

Basic diagram of boost converter

Mppt and mppt with pi converter based phtovoltic system

Simulation diagram of PV System using P&O
Algorithm

Results using P&O Algorithm at constant
temperature[25˚C] and irradiation[1000W/m^2]

Results using P&O algorithm at constant temperature and
change in irradiation

Results using P&O algorithm at constant irradiation
and change in temperature75 ,50,25˚C

Simulation diagram of PV system using PI controller

Results of PV system using PI
controller

Results of PV system using PI controller at temp
[25˚C], and varying irradiation

Results using PI controller at constant irradiation and
change in temperature75 ,50,25˚C

Result compare
Sr. No. Max
current
Max
voltage
Max power
Mppt 0.9638A 481.9V 464.5W
Mppt with
PI
controller
0.9801A 490.1V 480.3W

Conclusion
• Performance of system is improved
• Output power is also increased.

Mppt and mppt with pi converter based phtovoltic system

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