IRJET- Maximum Power Point Tracking of PV System by Particle Swarm Optimization Algorithm

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 126
Maximum Power Point Tracking of PV System by Particle Swarm
Optimization Algorithm
T. Diana1, Dr. K .Rama Sudha2
1PG scholar, Department of Electrical Engineering, Andhra University College of Engineering,
Visakhapatnam, India
2Professor, Department of Electrical Engineering, Andhra University College of Engineering,
Visakhapatnam, India
---------------------------------------------------------------------***----------------------------------------------------------------------
Abstract - In the recent years, the solar energy has become
one of the most important renewable sources of electrical
energy, so it is important to operatePhotovoltaic(PV)panelat
the optimal point to obtain the possible maximum efficiency.
This paper presents a best optimization approach in order to
maximize the output power of the PV module. The proposed
optimization technique isbasedonanobjectivefunctionwhich
represents the output power of PV module with some
constraints. The Particle Swarm Optimization (PSO) is one of
the best techniques that has been performing well on many of
the optimization problems. For maximum power point
tracking DC-DC boost converter is used in photovoltaicsystem
Key Words: Photovoltaic system, Particle swarm
optimisation, DC-DC boost converters, Photovoltaic panel,
maximum power point tracking.
1. INTRODUCTION
In the last years global warming is rapidly incrementing day
by day results in increasing of earth’s temperature and
energy crisis is the main problem in a country like India.
Among available energies, Photovoltaic (PV) system has
received a great attention as it appears to be one of the most
promising renewable energy sources. Power obtained from
PV module has to be maximum in order to meet our
requirements. So to maximize the power an optimization
technique called Particle swarm optimization (PSO) with
some constraints is used. The major problem in PV power
generation systems is that the amount of electric power
generated by PV module is always changing with weather
conditions, i.e., irradiation. To overcome this drawback
MPPT techniques are implemented by using DC-DC boost
converters.
1.1 Photovoltaic System
Photoelectric effect was first noted by French physicist
Edmund Becquerel in 1839. He proposed that certain
materials have property of producing small amounts of
electric current when exposed to sunlight. A photovoltaic
system makes use of one or more solar panels to convert
solar energy into electricity.It consists of various
components which includes the photovoltaic modules,
mechanical and electrical connections,mountingsandmeans
of regulating and modifying the electrical output. Because of
the low voltage generation in a PV cell, several PV cells are
connected in series for high voltage and in parallel for high
[6] current to form a PV module for desired output. The PV
array has been designed taken into consideration its
dependence upontheirradiance,temperatureandnumberof
PV cells connected in series and parallel.
Table -1: Design specifications of PV module
Short circuit current (ISC) 3.2A
Temperature(T) 273K
Reference temperature(Tref) 25K
Charge(q) 1.6*10^(-
19)C
Temperature coefficient 0.0017
Number of cells 36
Energy gap 1.1V
Open circuit voltage 21.6V
1.2 Working of PV cell
The basic principle behind the operation of a PV cell is
photoelectric effect. In this effect electron gets ejected from
the conduction band as a result of the absorptionof sunlight
of a certain wavelength by the matter (metallic or non-
metallic solids, liquids or gases). So, in a photovoltaic cell,
when sunlight hits its surface, some portion of the solar
energy is absorbed in the semiconductor material. The
electron from valence band jumps to the conduction band
when absorbed energy is greater than the band gap energy
of the semiconductor. By these hole-electrons pairs are
created in the illuminated region of the semiconductor. The
electrons created in the conduction band are now free to
move. These free electrons are enforced to move in a
particular direction by the action of electric field present
in the PV cells. These electrons flowing comprise current
and can be drawn for external use by connecting a metal
plate on top and bottom of PV cell. This current and the
voltage produces required power.
1.3 Maximum power point tracking
As an electronic system maximum power point tracker
(MPPT) functions the photovoltaic (PV) modules in a way

that allows the PV cells to produce all the power they are
capable of. It is not a mechanical tracking system which
moves physically the modules to make them point more
directly at the sun. Since MPPT is a fully electronic
system, it varies the module’s operating point so that the
modules will be able to deliver [5] maximum available
power. As the outputs of PV system are dependent on the
temperature, irradiation, and the load characteristics MPPT
alone cannot deliver the output voltage perfectly. For this
reason MPPT is required to be implementing in the PV
system to maximize the PV array output power. Maximum
power point tracker (or MPPT) is a high efficiency DC to DC
converter that presents an optimal electrical load to a solar
panel or array and produces a voltage suitable for the load.
PV cells have a single operating point wherethevaluesofthe
current (I) and Voltage (V) of the cell result in a maximum
power output. These values correspond to a particular load
Resistance which is equal to V/I asspecified byOhm'sLaw.A
PV cell has an exponential relationship between currentand
voltage, where as the resistance is equal to the negative of
the differential resistance (V/I = -dV/dI). Maximum power
point trackers utilize some type of control circuit or logic to
search for this point and thus to allow the converter circuit
to extract the maximum power available from a cell. In the
power versus voltage curve of a PV module there exists a
single maxima of power, i.e. there exists a peak power
corresponding to a particular voltage and current.
1.4 Necessity of Maximum Power Point
The efficiency of the solar PV module is low. Since the
module efficiency is low it is desirable to operate the
module at the peak power point so that the maximum
power can be delivered to the load under varying
temperature and irradiation conditions. This maximized
power helps to improve the use of the solar PV module. In
typical PV systems, not all the arrays are exposed to same
light irradiance, this partially shaded condition can occur
due to existence of trees or clouds. Under partially shaded
conditions, the entire array does not receive uniform
insulation, the P-V characteristics get more complex,
displaying several local maximum power points, but one of
them is the global MPP. Finding the global MPP is not a
trivial task when the PV array is partially shaded [4], due to
the existence of multiple local maximum points. The
conventional algorithm would trap in one of these local
maxima. Thus, there is a need to develop special maximum
power point tracking (MPPT) schemes that can track the
global point under these conditions. In this paper, particle
swarm optimization (PSO) technique is utilizedtosearchfor
the global MPP under partially shaded conditions. So the
fundamental aim of this part of the paper is to increase the
efficiency. There are several methods available,bywhichwe
can improve the efficiency by matching the source and load
properly. The MaximumPowerPointTracking(MPPT)isone
such method, which has a huge importance in the era of
Photovoltaic Technology. Now-a-days this technique is
vastly used to develop maximum possible power from a
varying source under a variable temperature and irradiance
conditions. We know, the Maximum Power Transfer
Theorem tells that the output power of a circuitismaximum,
when the Thevenin’s impedance of a circuit i.e. the source
impedance matches with the load impedance and complex
conjugate to it. So, MPPT problem is one kind of impedance
matching problem. Solar cells have a very complex
relationship between solar irradiation, temperature andthe
total resistance that develops a non-linear output efficiency
which can be analyzed based on the I-V curve. So the main
function of MPPT is to sample the output of the cells and
apply the proper load to obtain the maximum power for any
given location, time, season and environmental conditions.
The MPPT not only enables an increase in the power deliver
from the PV module to the load but also enhances the
operating lifetime of the PV system. Various types of MPPT
methods can be differentiated based on various features
including the types of sensors required, convergence speed,
cost, range of effectiveness etc.
2. OPTIMIZATION
Optimization forms an important part of our day-to-day life.
Many scientific, social, economic and engineering problems
have parameters that can be adjusted to produce a more
desirable outcome. This thesis investigates the behaviour of
best technique known as Particle Swarm Optimisation, a
technique that solves problems by simulating swarm. The
task of optimization is that of determining the values of a set
of parameters so that some measure of optimality is
satisfied, subject to certain constraints. It can be used to
solve a wide array of different optimization problems.
2.1 PSO Algorithm
The Particle Swarm Optimization (PSO) is a population
based optimization method. It is one of the most popular
nature-inspired optimization algorithm developedbyJames
Kennedy and Russell Eberhart in 1995[1,2]. Many popular
optimization algorithms are deterministic, like thegradient-
based algorithms. The PSO, similarly to the algorithms
belonging to the Evolutionary Algorithm family, is a
stochastic algorithm that does not need gradient informati
-on from the function. This allows the PSO to be used on
functions where the gradient is either unavailable or
computationally expensive to obtain. In this paper
constraints considered aretemperature,irradiance,velocity,
diversity factor etc. There are two types of models in PSO
algorithm. One is the G best model and other is the L best
model. G best model offers a faster rate of convergence[3] at
the expense of robustness. This model maintains only a
single “best solution,” called the global best particle, across
all the particles in the swarm. The L best model tries to
prevent premature convergence by maintaining multiple
attractors. A subset of particles is defined for each particle
from which the local best particle is then selected. The
primary objectives of this PSO is as follows:

• To develop a theoretical model for the convergence
behaviour of the Particle Swarm Optimization algorithm.
• To extend the PSO algorithm so that it becomes a
global optimization technique with guarantee convergence
on global optima.
The origins of the PSO are best described as sociologically
inspired, since the original algorithm was based on the
sociological behaviour associated with bird flocking. The
algorithm maintains a population of particles, where each
particle represents a potential solution to an optimization
problem.PSO consists of a swarm of bird-like particles
• Each particle resides at a position in the searchspace
• The fitness of each particle represents the quality of
its position
• The particles move over the search space with a
certain velocity
• The velocity (both direction and speed) of each
particle is influenced by its own best position foundsofar, p
best the best solution that was found so far by its social
neighbors, l best, and/or the global best so far g best
• “Eventually” the swarm will converge to optimal
positions
Chart-1: Flow chart of PSO algorithm
3. DC-DC CONVERTERS
The DC-DC converter used to supply a regulated DC
output with the given DC input. These converters can be
used as switchingmoderegulatorstoconvertanunregulated
dc voltage to a regulated dc output voltage. The regulation is
normally achieved by PWM at a fixed frequency and the
switching device is generally BJT, MOSFET or IGBT. These
are widely used as an interface between the photovoltaic
panel and the load in photovoltaic generating systems. The
load must be adjusted to match the current and voltage of
the solar panel so as to deliver maximum power. DC/DC
converters are described as power electronic switching
circuits since they convert one form of voltage to other.
These are applicable for conversion of different voltage
levels. In this paper, the photovoltaic system with DC-DC
boost converter [7] and maximum power point controller
has been designed and constant voltage is maintained at the
output side of the converter. For the specified input
variation, a regulated dc output voltage has been obtained
resulting in a better efficiency. From the modelling of boost
converter, it was also observed that the outputvoltageofthe
boost converter increases along with the increase in duty
cycle.
3.1 Operation of Boost converter
When the switch S1 is turned on by the pulse of PWM,
current flows through the inductor (L) and energy is stored
in it. When switch is turned off, energy storedintheinductor
in the form of magnetic field provides an induced voltage
across the inductor that adds to the input voltage. The input
voltage and voltage across the inductor are in series and
collectively charge the output capacitor (Cout) to a voltage
higher than input voltage [8].The figure (4.1) below shows a
step up or PWM boost converter. It consists of a dc input
voltage source Vg, boost inductor L, controlled switch S,
diode D, filter capacitor C, and the load resistance R. When
the switch S is in the on state, the current in the boost
inductor increases linearly and the diode D isoffatthattime.
When the switch S is turned off, the energy stored in the
inductor is released through the diode to the output RC
circuit.
Figure-1: Circuit diagram of Boost converter
3.2 Steady state analysis of boost converter
(a) OFF STATE:
In the OFF state, the circuit becomes as shown in the Figure
(2) below [9].
When the switch is off, the sum total of inductor voltage and
input voltage appear as the load voltage.
Figure-2: Off state diagram of Boost converter
(b) ON STATE:
In the ON state, the circuit diagram is as shown below in
Figure (3)

Figure-3: On state diagram of Boost converter
When the switch is ON, the inductor is charged from the
input voltage source Vg and the capacitor discharges across
the load. The duty cycle, D=25 where T=0.1s
Fig-4: Output power of boost converter in simulink
Fig-5: PV curves for maximum power
Fig-6: Global and optimized power
Fig-7: Output voltage in simulation
Fig-8: Output power in Boost converter
3. CONCLUSIONS
In this paper an approach to achieve maximum powerpoint
tracking of the power obtained from PV panel by using a
particle swarm optimization algorithm techniquewithsome

constraints is discussed. This ParticleSwarmOptimizationis
one of the best algorithms in the point of guarantee
convergence. It converges to a local maxima or minima
depending up on the objective function we implement. In
this paper, the concepts of particle swarmoptimizationhave
been discussed on finding the maximum power point.
Further, its algorithm has been developed.
In this paper by using a DC-DC boost converter one can
observe, the boosted voltage as well as required output
power. In this paper PV panel is the voltage source to boost
converter and its pulses are given by pulse generator which
reduces complexity and improves efficiency of the circuit as
there is increase in green house effect today this paper gives
best power output followed byPSOtotrack maximumpower
from solar panel without pollution and green house
emission.
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