MAXIMUM POWER POINT TRACKING TECHNIQUES: A REVIEW

International Journal of Recent Research in Electrical and Electronics Engineering (IJRREEE)
Vol. 1, Issue 1, pp: (25-33), Month: April - June 2014, Available at: www.paperpublications.org
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MAXIMUM POWER POINT TRACKING
TECHNIQUES: A REVIEW
Chandani Sharma1
, Anamika Jain2
Research Scholar, Dept. of ECE, Era University, Dehradun, Uttrakhand, India 1
HOD, Dept. of ECE, Graphic Era University, Dehradun, Uttrakhand, India 2
Abstract: Electricity is the world's fastest-growing form of end-use energy consumption. Net electricity generation
worldwide will rise by 2.3 percent per year on average till 2035. Renewables are the fastest growing source of new
electricity generation. Indian Solar PV Market enjoys its Place in the solar applications following the Infusion of
tracking requirements. This paper focuses on the comparative study of maximum power point tracking (MPPT)
techniques. It has been analysed with different MPPT methods following the same goal of maximizing the PV system
output power by tracking the maximum power on every operating condition. In this paper maximum power point
tracking techniques are reviewed on basis of simplicity, convergence speed, digital or analogical implementation,
sensors required, cost, range of effectiveness, and in other aspects.
Keywords: MPPT, Tracking techniques, Convergence speed, Digital or analogical implementation.
I. INTRODUCTION
A maximum power point tracking algorithm is absolutely necessary to increase the efficiency of the solar panel as it has been
found that only 30-40% of energy incident is converted into electrical energy. Due to the growing demand on electricity, the
limited stock and rising prices of conventional sources (such as coal and petroleum, etc.), photovoltaic (PV) energy becomes
a promising alternative as it is omnipresent, freely available, environment friendly, and has less operational and maintenance
costs. Therefore, the demand of PV generation systems seems to be increased for both standalone and grid-connected modes
of PV systems [22], [27]. Therefore, an efficient maximum power point tracking (MPPT) technique is necessary that is
expected to track the MPP at all environmental conditions and then force the PV system to operate at that MPP point.
MPP refers to PV’s unique operating point delivering maximum power giving highest efficiency of array. It varies with
solar insolation and temperature & needs to be monitored through tracking techniques. The operating characteristics of a
solar cell consist of two regions as represented in Fig 1, the current source region and the voltage source region. In the current
source region, the internal impedance of the solar cell is high and this region is located on the left side of the current-voltage
curve. The voltage source region, where the internal impedance is low, is located on the right side of the current-voltage
curve. As per Maximum Power Transfer Theorem, Maximum Power is delivered to load when source internal impedance
matches load impedance.
FIG 1: VOLTAGE-CURRENT & POWER-VOLTAGE CHARACTERISTICS

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For determining MPP appropriate Tracker is introduced between PV system and load. It is to be designed that gives good
performance, fast response, and less fluctuations. Since the efficiency of the PV is affected by the panel’s irradiance and
temperature which are stochastic and unpredictable. For this reason, it is not possible to connect the load directly to the PV to
obtain the maximum power, so it is necessary to include a balance of system (BOS). Typically this BOS is a DC-DC
converter to adjust the properties of the load. This converter has the advantage of managing the power delivered to the load.
DC/DC converter is responsible for transferring maximum power from the solar PV module to the load. This acts as
adjustment to match impedance of source & load. MPPT is normally operated with the use of a dc-dc converter (step up or
step down). The location of the MPP is not known, but can be located, either through calculation models or by search
algorithms. Fig 2 gives Block Diagram of MPPT System.
FIG 2: BLOCK DIAGRAM OF MPPT SYSTEM
The voltage across the DC-DC converter is fed to obtain an isolated load. The input–output voltage relationship for converter
conduction mode is given by Duty Cycle. To compensate the parameter variations due to temperature and irradiance
variations, Controller is used in the process. It makes system adaptive to changes in the environment.
II. LITERATURE REVIEW
Several MPPT techniques together with their implementation are reported in the literature [3]–[38]. Researchers always feel
confused while selecting an MPPT technique for a particular application. Unfortunately, only a few techniques were available
in this field including Curve fitting, Fractional Short Circuit Current, Fractional Open Circuit Voltage, Look Up Table, One
Cycle Control, Perturb and Observe, Incremental Conductance and Feedback techniques earlier that includes discussions on
MPPT techniques [22]-[38] until 2007. But many new MPPT techniques such as Fuzzy logic, Artificial Neural Network,
Adaptive Perturbation and Observation, Estimated perturb and perturb, Genetic Algorithm, Adaptive Neuro fuzzy and
particle swarm optimization based MPPT, etc., have been reported since then illustrated in other papers [3]-[21].
It is necessary to prepare a review that includes all the efficient and effective MPPT techniques proposed before 2007 and
after that until 2013. A review, comparison of the MPPT techniques on the basis of their advantages, disadvantages, control
variables involved, types of circuitry, complexity of algorithm, complexity level on hardware implementation, and types of
scientific and commercial application is described.
Among all the MPPT methods, Perturb & Observe (P&O) and Incremental Conductance (IC) are most commonly used
because of their simple implementation and lesser time to track the maximum power point and also other economic reasons.
Under suddenly changing weather conditions (irradiation level) as MPP changes continuously, P&O takes it as a change in
MPP due to perturbation rather than that of irradiation and sometimes ends up in calculating wrong MPP [6]. However this
problem is eliminated in Incremental Conductance method as the algorithm takes two samples of voltage and current to
compute MPP [19]. However, instead of more efficiency the complexity of the algorithm is very high compared to the former
one and hence the cost of execution increases. So we have to extenuate with a trade-off between ramification and efficiency.

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It has been observed that the efficiency of the system also relies upon the converter. Generally, it is maximum for a buck
analysis, then for buck-boost analysis and minimum for a boost analysis [11]. When multiple solar modules are connected in
parallel, equalization of output operating points in correspondence to force displacement of input operating points of the
identical operating system is evaluated. It is very elementary to carry out and has high efficiency both under stationary and
time varying atmospheric conditions [23]. Among all the MPPT methods, Perturb & Observe (P&O) and Incremental
Conductance are most commonly used because of their simple implementation and lesser time to track the maximum power
point and also other economic reasons. Under suddenly changing weather conditions (irradiation level) as MPP changes
continuously, P&O takes it as a change in MPP due to perturbation rather than that of irradiation and sometimes ends up in
calculating wrong MPP[7]. However this problem is eliminated in Incremental Conductance method as the algorithm takes
two samples of voltage and current to compute MPP. However, instead of more efficiency the complexity of the algorithm is
very high compared to the former one and hence the cost of execution increases. So we have to extenuate with a trade-off
between ramification and efficiency.
Since the maximum amount of solar energy, captured by the collector, is related to the accuracy for tracking sun’s position
[28], then a high-precision sun tracking controller should be considered. In previous years, several schemes have been
proposed to improve tracking systems for following the trajectory of the sun based on orientation and tilt motion control [7],
[21]. These schemes include: optimizing tilt and orientation angles of solar collectors by using geographical latitudes
information [10], mathematical models [35], and tracking algorithms [13], [33-34]. In order to automatically adjust tilt and
orientation angles in relation to the sun position, in the field of control engineering some approaches have been proposed
based on motion control [12], [20] and signal processing by using information coming from electronic devices [13, 17].
Recently, some of the most relevant and prominent control schemes, in solar applications, have been introduced in the field of
artificial intelligence which include: sun tracking systems using fuzzy control based on light-sensors, ambient temperature
and electric load variations [5] fuzzy algorithms to connect domestic apparatus on either the electrical grid or a photovoltaic
panel [8], [9], [18], [19], [34] prediction [24], [25], [26] and estimation of current using solar radiation [15], and hybrid
systems using solar energy with technology based on genetic algorithms [14]. Although exist various approaches based on
intelligent techniques, the human knowledge has been interpreted just as information coming from sensors and electronics
devices. This structure is simple and allows the initial setting of network parameters to be intuitively selected. Thus by
following IF–THEN rules, similar to human sense, multivariate information could be included into the fuzzy inference
system.
But there exists human knowledge generated since many years ago in astronomical and physics research [30], [31], [32] that
should be a powerful tool-based-knowledge. For example, the advantage of integration between fuzzy logic and neural
networks, called neuro-fuzzy, is due to the learning ability of neural networks and the human-like reasoning of fuzzy logic
[16]. Therefore, this scheme suggests that human knowledge could be included not only based on electronic devices
information but also based on astronomical information obtained from databases and scientific knowledge accumulated
through the years.
Classification of MPPT techniques [3], [4] in above surveyed papers defines control strategies of three types: indirect control,
direct control, and probabilistic control. Direct control strategies can seek MPP directly by taking into account the variations
of the PV panel operating points without any advanced knowledge of the PV panel characteristics. This is again of two types
such as sampling methods and modulation methods. Two different control variables such as voltage, current or solar
irradiance, temperature etc. are often chosen to achieve the MPPT applications. According to the variables which need to be
sensed, MPPT techniques can be classified into two types, such as one-variable techniques and two-variable techniques. It is
easier and cheap to implement voltage sensor whereas current sensor. The circuitry involved in MPPT techniques are of two
types such as analog circuit and digital circuit. Some applications need accurate MPPT and cost is not an issue, such as, solar
vehicles, industry, large-scale residential. But some systems like small residential applications, water pumping for irrigation,
etc., need a simple and cheap MPPT technique. Expensive applications generally use advanced and complex circuitry
because accuracy and fast response are main priorities there.
Considering the above facts, review justified that Fuzzy logic system based Intellegent or Hybrid techniques in PV give Good
performances, Fast responses, No overshoot, & less Fluctuations for rapid temperature and irradiance variations. For Fuzzy

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Logic Controller & Neuro- Fuzzy based Systems there is no requirement of exact PV model hence they will be considered to
work upon. Fuzzy logic provides an attractive framework to work when designing a scheme for the detection of shaded
Photovoltaics. The low modeling requirements and high prototyping speed of a fuzzy logic scheme, given that such
consensus is lacking, are of great benefit [4].
III. TECHNIQUES COMPARISON
S.N TECHNIQUE
USED
DESCRIPTION METHOD VARIABLE CKT TUNING COST HARD
WARE
1 Curve Fitting Characteristics based on
mathematical equations or
numerical approximations using
third order polynomial with roots.
Incremental
Conductance
Voltage Digital Yes Inexp Simple
2 Forced Short
Circuit Current
Nonlinear characteristics of PV
system is modeled using
mathematical equations or
numerical approximations for
IMPP=KSCISC
Incremental
Conductance
Voltage or
Current
Analog
and
Digital
Yes Inexp Simple
3 Forced Open
Circuit Voltage
In this technique, roots can be
calculated from the empirical
relationship shown as follows for
VMPP=KOCVOC
Incremental
Conductance
Voltage or
Current
Digital Yes Inexp Simple
4 Look Up Table MPP of a PV system is calculated
before hand for each probable
environmental condition and
stored in the memory device of
MPPT’s control system.
Incremental
Conductance
Voltage or
Current
Analog
and
Digital
Yes Inexp Simple
5 One Cycle
Control
Nonlinear MPPT control
technique. It involves the use of a
single-stage inverter where the
output current of the inverter can
be adjusted according to the
voltage of the PV array so as to
extract the maximum power from
it.
Sampling
Method
Current Analog
and
Digital
Yes Inexp Simple
6 Differenciation
dV/dt
This technique determines MPP of
a PV system on solving the
following:
dP/dt=d(IV)/dt=IdV/dt + VdI/dt=0
Sampling
Method
Voltage or
Current
Digital Yes Exp Complex
7 Feedback
Voltage or
Current
This technique is used in the
system which has no battery.
Without a battery, a simple
controller is needed to fix the
panel voltage at a constant level.
Hence, a simple MPPT controller
can be applied to maintain duty
cycle of converter.
Sampling
Method
Voltage or
Current
Digital No Exp Complex
8 Feedback Power
with Current
Similar to above technique with
variation related to dP/dI equating
0 at MPP.
Sampling
Method
Voltage or
Current
9 Feedback Power
with Voltage
Similar to above technique with
variation related to dP/dV
equating 0 at MPP.
Sampling
Method
Voltage or
Current
Analog
and
Digital
No Exp Complex
10 Perturb and
Observe Hill
Climbing
First PV voltage and current are
measured power is calculated. A
small perturbation of voltage or
perturbation of duty cycle is done
and then compared with previous
power.
Sampling
Method
Voltage or
Current
Analog
and
Digital
No Exp Complex

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11 Increment
Conductnce
For a PV system, the derivative of
panel output power with its
voltage is expressed as dP/dt=d
(IV)/dt=I + VdI/dV=0.It is zero at
MPP, positive on the left and
negative on the right of MPP.
Sampling
Method
Voltage or
Current
12 Forced
Oscillation
Small-signal sinusoidal is injected
into the switching frequency and
comparing the ac component and
the average value of the panel
terminal voltage.
Modulation
Method
Voltage or
Current
Analog Yes Exp Complex
13 Ripple
Correction
Control
When a PV array is connected to a
power converter, the switching
action of the converter imposes
voltage and current ripple on the
PV array. These ripples are used to
determine MPP.
Modulation
Method
Voltage or
Current
Analog Yes Exp Complex
14 Estimated
Perturb Perturb
EPP technique is an extended
P&O method. This technique has
one estimate mode between two
perturb modes for irradiance-
changing conditions.
Sampling
Method
Voltage or
Current
Analog
and
Digital
No Exp Complex
15 Intelligent
Techniques
Fuzzy Logic based Artificial
Neural Network Based Particle
swarm optimization based
Intelligent
Method
Voltage or
Current
16 Hybrid MPPT
Techniques
P&O-ANN hybrid MPPT tracking
is possible. For strengthening
ANN based MPPT technique
using Genetic Algorithm (GA).
Adaptive Neuro-Fuzzy inference
system (ANFIS).
Sampling
Method
Voltage or
Current
Digital Yes Exp Medium
17 DMPPT
Techniques
Distributed MPPT due to
orientations of PV modules in
array, shadowing effects,
manufacturing tolerances,
nonuniformity of temperature,
uneven solar irradiation and air
circulation, dust and spot dirtiness.
Intelligent
Method
Voltage or
Current
After surveying various Research works following limitations are highlighted:
(i) In [22-38] it is described that methods relative to FOCV, FSCC, RCC, and LUT cannot regulate both input and
output impedances at the same time as they are offline Indirect based techniques based on pre determined data
hence online systems only need to be implemented.
(ii) The efficiency gain from MPPT is large, but the system needs to take efficiency loss by DC-DC converter into
account. Systems using direct techniques cannot regulate both input and output at the same time. Also the MPPT
stops its original task if the load cannot consume all the power delivered resulting in tradeoff between efficiency
and the cost [5], [6].
(iii) Intelligent systems achieve good performances, less fluctuations with no overshoot if implemented properly. [3],
[4]
(iv) Either MPPT tracking algorithm using different techniques or Panel Rotation techniques have been identified [4]-
[37]. To obtain maximum profit of standalone or grid connected PV system both need to be studied on a collective
scale if MPPT efficiency needs to be improved given by:

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where PPV refers to Power produced at output of PV Panel and PMPP refers to Power produced at MPP.
(v) The international PHOTON magazine proposes diagnosis for Real time PV Simulator. Different orientations of PV
modules in array , shadowing effects by clouds , manufacturing tolerances, nonuniformity of ambient temperature ,
uneven solar irradiation and air circulation, dust and spot dirtiness (leaves, bird droppings) as studied in [9] leading
to Distributed Maximum Power Point Tracking (DMPPT) need to be emphasized on.
(vi) Solar cell Configurations related to Perovskites particular type of crystalline materials need to stack upon for
increasing absorption property, reducing dirt, less expensive installation & efficient working [37].
IV. RESULT AND DISCUSSION
In the fig 3, 4 and 5, graph of Current Vs Voltage, Power Vs Voltage and Maximum Power Point are plotted using Simulink
Modelling in MATLAB.
FIG 3: IV CHARACTERISTICS OF MPPT SYSTEM
FIG 4: PV CHARACTERISTICS OF MPPT SYSTEM

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FIG 5: MPP DETERMINATION
VI. CONCLUSION
Thus comparison and results show that intellegent methods systems prove more adaptive in regulating PV outputs.
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