This technical seminar discusses maximum power point tracking using a buck converter for solar photovoltaic systems. It describes the characteristics of solar cells and modules, and how maximum power point tracking algorithms and switch mode DC-DC buck converters can be used to extract the maximum available power from the solar panels under varying operating conditions. Simulation and experimental results are presented comparing the performance of two buck converter topologies - the basic buck converter with input filter and a fourth-order buck converter - for maximum power point tracking applications.
The electric power supplied by a photovoltaic power generation system depends on the solar radiation and temperature. Designing efficient PV systems heavily emphasizes to track the maximum power operating point.
This work develops a three-point weight comparison method that avoids the oscillation problem of the perturbation and observation algorithm which is often employed to track the maximum power point. Furthermore, a low cost control unit is developed, based on a single chip to adjust the output voltage of the solar cell array.
The electric power supplied by a photovoltaic power generation system depends on the solar radiation and temperature. Designing efficient PV systems heavily emphasizes to track the maximum power operating point.
This work develops a three-point weight comparison method that avoids the oscillation problem of the perturbation and observation algorithm which is often employed to track the maximum power point. Furthermore, a low cost control unit is developed, based on a single chip to adjust the output voltage of the solar cell array.
These slides present the maximum power point tracking (MPPT ) algorithms for solar (PV) systems. Later of the class we will discuss on MPPT control of wind generators.
The solar energy is converted to electrical energy by photo-voltaic cells. This energy is stored in batteries during day time for utilizing the same during night time. A charge controller, or charge regulator is basically a voltage and/or current regulator to keep batteries from overcharging. It regulates the voltage and current coming from the solar panels going to the battery.
Advance Solar charge controller with lot of benefits. An advantage over common PWM Solar charge controller. Double Boost Technique is used to get a desired output.
Hey Guys,
This Project we made it for final year Engineering students and for well knowledge. It was an amazing experience when we made it successfully.
If you want this project then contact :
Kalpesh Badgujar - 8879254715
if any query about this project mail :
badgujarkalpesh201@gmail.com
Brief description of solar PV system and study of Maximum Power point tracking techniques. Here two methods has been discussed - 1) Perturbation and observation 2) Incremental conductance.
Smart Grid: Definition
• Need of smart grid
• Smart grid functions
• How Smart Grid Works
• Smart Grid: Benefits
• Smart grid components and its Benefits
• Issues and Challenges
• Opportunities in future
• Smart Grid Projects in India and Gujarat
• Question-Answer
• References
Fault location and correction are important in case of any power systems. This process has to be prompt and accurate so that system reliability can be improved , outage time can be reduced and restoration of system from fault can be accelerated.
Fault location calculation using Magnetoresistance sensor is described here.
These slides present the maximum power point tracking (MPPT ) algorithms for solar (PV) systems. Later of the class we will discuss on MPPT control of wind generators.
The solar energy is converted to electrical energy by photo-voltaic cells. This energy is stored in batteries during day time for utilizing the same during night time. A charge controller, or charge regulator is basically a voltage and/or current regulator to keep batteries from overcharging. It regulates the voltage and current coming from the solar panels going to the battery.
Advance Solar charge controller with lot of benefits. An advantage over common PWM Solar charge controller. Double Boost Technique is used to get a desired output.
Hey Guys,
This Project we made it for final year Engineering students and for well knowledge. It was an amazing experience when we made it successfully.
If you want this project then contact :
Kalpesh Badgujar - 8879254715
if any query about this project mail :
badgujarkalpesh201@gmail.com
Brief description of solar PV system and study of Maximum Power point tracking techniques. Here two methods has been discussed - 1) Perturbation and observation 2) Incremental conductance.
Smart Grid: Definition
• Need of smart grid
• Smart grid functions
• How Smart Grid Works
• Smart Grid: Benefits
• Smart grid components and its Benefits
• Issues and Challenges
• Opportunities in future
• Smart Grid Projects in India and Gujarat
• Question-Answer
• References
Fault location and correction are important in case of any power systems. This process has to be prompt and accurate so that system reliability can be improved , outage time can be reduced and restoration of system from fault can be accelerated.
Fault location calculation using Magnetoresistance sensor is described here.
It’s a power electronics project. It is able to give output voltage(DC) more and less than input voltage as per requirement.
We can generate variable DC voltage which is less than input, but, the special things about this converter is, it has capability to produce variable DC voltage as high as twice the input voltage.
We have specially designed and manufactured inductor for this project.
Design and Simulation of Efficient DC-DC Converter Topology for a Solar PV Mo...Sajin Ismail
Modulated Integrated Converter systems are considered to be the new and global turning point in the field of
Solar PV systems. These converters are highly recognised for its modular size and compact nature and they are supposed to
be attached directly with each PV module and since one PV module is having the power rating of a few watts ranging from
0-500Ws, the design rating would be in the same range and thus the most vital condition in such a design is efficiency
under these relatively low loads. In this paper an isolated interleaved boost converter topology is considered in the DC-DC
section and which is designed and simulated for a specific power rating (250W) and the efficiency is analysed with varying
load conditions and compared with the target efficiency of the system.
Development of a Novel Robust Differential Maximum Power Point Tracking (MPPT...IJSRP Journal
The use of photovoltaic (PV) systems is increasingly growing in importance since they involve an exploitation of solar radiation constituting an energy source which is renewable, available in most places, and pollution-free. Despite their numerous advantages, PV systems have two major drawbacks: low energy conversion efficiency and loss of energy due to variations in meteorological conditions; for this reason, Maximum Power Point Tracking (MPPT) control techniques play a key role in exploiting the maximum energy caught by PV modules. The output characteristic of a photovoltaic array is nonlinear and changes with solar irradiation and the cell’s temperature. Therefore, a Maximum Power Point Tracking (MPPT) technique is needed to draw peak power from the solar array to maximize the produced energy. In this study we have analyzed the Maximum Power Point Tracking (MPPT) method and finding out a new and easier way to track maximum power point (MPP) and also our study is focused to overcome the drawbacks of MPPT. This research paper presents a novel MPP tracking method for tracking exact Maximum Power Point (MPP) if the irradiation or load changes.
Modified Bidirectional Converter with Current Fed InverterIJPEDS-IAES
A bidirectional dc-dc converter with multiple outputs are concatenated with a
high frequency current source parallel resonant push pull inverter is
presented in this paper. The two outputs are added together and it is taken as
the input source for the inverter. The current source parallel resonant push
pull inverter implemented here with high frequency applications like
induction heating, Fluorescent lighting, Digital signal processing sonar. This
paper proposes a simple photovoltaic power system consists of a
bidirectional converter and a current fed inverter for regulating the load
variations. Solar power is used as the input source for the system. Simulation
of the proposed system is carried out in PSIM software and experimentally
verified the results.
Maximum PowerPoint Tracking of PV System Based on a SEPIC Converter Using Fuz...IJERA Editor
This paper presents the MPPT (Maximum power point tracking) operation of PV (Photovoltaic) system based
on a SEPIC (Single Ended Primary Inverter Converter) converter using fuzzy logic controller. MPPT method
such as Incremental conductance base on FLC (Fuzzy Logic Controller) is used to extract maximum output
power of the PV system. PV energy is the most essential energy resources since it is pollution free, clean and
endless. The FLC proposed scheme is interface with the MPPT to generate the PWM (Pulse Width Modulation)
for the SEPIC controller for maximum power point tracking operation.FLChas used Mamdani’s method for
convergent and divergent of membership function. FLC is used for more efficient performance under the
variation in different atmosphere. The fuzzy logic controller with SEPIC for MPPT scheme extract the
maximum power point tracking without any change in the voltage at the inverter at different load condition. The
behavior of the converter and controller tested in simulation at different operating conditions. Proposed scheme
is used for accurately tracking maximum point and also send the smooth, error free signal to the inverter.
Maximum PowerPoint Tracking of PV System Based on a SEPIC Converter Using Fuz...IJERA Editor
This paper presents the MPPT (Maximum power point tracking) operation of PV (Photovoltaic) system based
on a SEPIC (Single Ended Primary Inverter Converter) converter using fuzzy logic controller. MPPT method
such as Incremental conductance base on FLC (Fuzzy Logic Controller) is used to extract maximum output
power of the PV system. PV energy is the most essential energy resources since it is pollution free, clean and
endless. The FLC proposed scheme is interface with the MPPT to generate the PWM (Pulse Width Modulation)
for the SEPIC controller for maximum power point tracking operation.FLChas used Mamdani’s method for
convergent and divergent of membership function. FLC is used for more efficient performance under the
variation in different atmosphere. The fuzzy logic controller with SEPIC for MPPT scheme extract the
maximum power point tracking without any change in the voltage at the inverter at different load condition. The
behavior of the converter and controller tested in simulation at different operating conditions. Proposed scheme
is used for accurately tracking maximum point and also send the smooth, error free signal to the inverter
Finite Step Model Predictive Control Based Asymmetrical Source Inverter with ...IJERD Editor
This paper presents techniques of maximum power point tracking (MPPT) implemented with finite step model predictive control (FSMPC) for the application of Asymmetrical Γ -source inverter. Incremental conductance MPPT algorithm and FSMPC model is developed to control the output current of the grid-tied Inverter. Both steady-state and transient results show that the high efficiency and robust response of the proposed control technique. Impedance-source inverters are inverters with voltage buck- boost capability that cannot be achieved by the traditional inverters. Their boost capability is introduced by shorting their phase-legs without causing damages. Impedance-source inverters are therefore less prone to false triggering caused by electromagnetic interference. The asymmetrical Γ -source inverters proposed in the paper, whose gain is raised by lowering their turns ratio towards unity. Input current drawn by the proposed inverters is smoother and hence more adaptable by the source.
Real Time Implementation of Variable Step Size Based P&O MPPT for PV Systems ...IJPEDS-IAES
Nowadays Solar energy is an important energy source due to the energy crisis and environment pollution. Maximum power point tracking (MPPT) algorithm improves the utilization efficiency of a photovoltaic systems. In this paper an improved P&O MPPT algorithm is developed and simulated using MATLAB / SIMULINK to control the DC/DC buck converter. The obtained simulink model is also verified using dspace tool. Both the simulated and experimental results are validated by also comparing them with conventional MPPT methods. The performance measures show the increase in the efficiency of PV system by the proposed model.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Solar energy based impedance-source inverter for grid systemIJECEIAES
In this work, the fickleness of solar energy can be overcome by using Maximum Power Point Tracking algorithm (MPPT). Perturb and Observation (P&O) MPPT algorithm accomplish fast the maximum power point for rapid change of environmental conditions such as irradiance intensity and temperature. The MPPT algorithm applied to solar PV system keep the boost converter output constant. Output from boost converter is taken to three phase impedance-source inverter with RL load and grid system. Impedance-source inverter performs the transformation of variable DC output of the solar PV system in to near sinusoidal AC output. This near sinusoidal AC output consecutively is served to the RL load first and then to grid system. The simulation is carried out in matlab/simulink platform both for RL load and grid system and the simulation results are experimentally validated for RL load arrangement only.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
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POWER POINT TRACKING
1. A TECHNICAL SEMINAR ON
MAXIMUM POWER POINT TRACKING
USING BUCK CONVERTER
1
PRESENTED BY
ANAS ALI USMANI (53)
RAHUL SINGH (44)
MD SHARIQUE AHMAD (69)
2. CONTENTS
INTRODUCTION
SOLAR CELL CHARACTERISTICS
PHOTOVOLTAIC SYSTEM
MAXIMUM POWER POINT TRACKING
SWITCH MODE DC-DC BUCK CONVERTER
PERFORMANCE COMPARISON OF BCIF AND FOBC TOPOLOGIES
FOURTH ORDER BUCK CONVERTER
STATE SPACE REPRESENTATION
DISCUSSION OF SIMULATION AND EXPERIMENTAL RESULT
EFFECT OF COUPLING
CONCLUSION
REFERENCE
2
3. INTRODUCTION
India lies in a sunny tropical belt (High insolation). Total approximate potential annually over 5000
trillion kWh. Current cost of production is 12/KWh and expected cost is 6/KWh by 2020.
Characteristics of dark and illuminated silicon pn junction is shown in Fig.1.goveren by this equation-
Dark:-
Illuminated:-
PV cell operates to produce maximum power point(MPP) by
plotting hyperbola defined as V X I = constant as shown in Fig.2.
Dark
Illumination
V
I
𝑰 𝒕𝒐𝒕𝒂𝒍 = 𝑰 𝟎 𝒆
𝒒𝑽
𝒌𝑻 − 𝟏 − 𝑰 𝒔𝒄 . . .
𝟐
𝑰 𝒕𝒐𝒕𝒂𝒍 = 𝑰 𝟎 𝒆
𝒒𝑽
𝒌𝑻 − 𝟏 ...1
Fig.1 I-V characteristic
3
4. One point at which it will produce maximum power under the incident
illumination level.
Fig.2. P-V & I-V characteristic
An ideal cell would have a perfect
rectangular characteristics having
unity fill factor.
Fig.3. Equivalent circuit of solar PV array.
I= Isc – Io{exp[ q(V + RsI)/(nkTk) ]- 1} – (V+RsI)/Rsh
For a practical cell the equation is
modified as:-
4
Solar cell Characteristics
6. Cont…
Output power manly depend upon nature of load connected to it. Direct load connection to
the PVA system result in poor over all efficiency.
Various switch mode DC-DC topologies used in MPPT application which track MP at all
solar isolation leading to an improved performance .
Power tracking methods are:-
Perturb and observe algorithm (P & O).
Incremental conductance method (ICM).
Voltage base method (VBM).
Search based method (SBM).
6
7. While selecting a tracking scheme is the accuracy and tracking speed requirement.
Performance of a PV system depends on several factors such as:-
Type of power converter used.
Tracking methodology employed.
Nature of filters employed.
From the converter performance improvement point of view ripple reduction through
zero ripple filter is more popular in the DC-DC conversion.
Zero ripple filter significantly reduces the input low and high frequency current ripples.
7
8. Topologies of DC-DC Converter
Isolated type converter
Flyback
Half Bridge
Full Bridge
Non-Isolated type converter
Buck-Boost
SEPIC
Cuk
Grid tied system used this
topologies, as isolation is
required for safety reason.
Most of the DC drive
used this converter. No
need of transformer .
8
9. PVA modules are connected in series and parallel to realize required voltage and current
demands of power converter to extract maximum power and a load.
Load may be:-
Stand alone sink type
Battery
Up stream converter
Combination above
The PV module output voltage is a function of the photocurrent which is mainly
determined by load current depending on the solar radiation level during the operation.
9
10. Buck topologies which will track MP at all solar isolation leading to an improvement
performance of BCIF.
To reduce ripple current even more without using any additional passive component a
coupled inductance arrangement is used for FOBC.
Buck converter are used in PV application-
Front end step down applications.
Battery charging.
MPP
10
11. WHAT IS MPPT?
The voltage at which PV module can produce maximum power is called ‘maximum power point’
(or peak power voltage).
MPPT or Maximum Power Point Tracking is algorithm that included in charge controllers used
for extracting maximum available power from PV module under certain conditions.
MPPT are used to ensure impedance match to improve the efficiency of the solar panel in
delivering its maximum power.
MPPT (Maximum Power Point Tracker) is a electronic device which maximize PV module output
under varying operating condition.
Typical solar panel can only convert 30% to 40% of the incident solar irradiation into electrical
energy..
11
12. Maximum power point of a pv cell
For any load connected to this system, the
output power=VoIo
.If load power increases, i.e. VoIo increases,
the value of output voltage.
This happens only up to a point after which
current in the system starts decreasing.
This point where the current is at brim is
called maximum power point.
12
Fig.5 MPPT CURVE with I vs V
13. How to track this point?
For tracking the mppt , we use dc-dc switch mode convertors.
These convertors can control the output voltage by controlling
the duty ratio of the switch.
Vo=f(D,Vi)
Hence we can limit the output voltage to the limit where we get
the maximum output power.
13
Fig.6 MPPT CURVE with P vs V
15. Drawbacks of normal
buck convertors
Normal buck convertors are prone to high
amount of ripple currents , which lead to rippled
output power.
ripple currents produce their respective power
losses thus decreasing efficiency.
Source current of such a system is not continuous.
To overcome such abnormalities we introduce
input filters which make the input current
continuous.
15
Fig.8 Buck topologies for PV power tracking scheme BCIF
based
16. Drawbacks using separate
input filters
Input to solar cell or irradiance is not a constant quantity, so it
is difficult to design filters for every irradiance.
Using a separate filter at input side increases resistance of the
system thus introducing more power loss.
For a stable system output impedence of filter should be less
than input impedence of the convertor.
Increases overall cost of the system.
16
17. Fourth order buck convertor
ADVANTAGES
Inductor L2 is common between the input
filter and output side thus reduces cost of
filter.
Proper design of coupled inductor structure
can steer entire ripple current into one
winding rendering input current (buck) ripple
free.
Voltage conversion ratio, i.e. output to input
voltage is same as the second order buck
convertors.
17
Fig.9 Buck topologies for PV power tracking scheme FOBC based
18. ANALYSIS OF FOURTH ORDER CONVERTORS
.Applying kvl in outer loop, we get
VL1=Vi - Vo
And VL2 = VC1-Vo,
Over the average cycle VL1 and VL2 are zero.
Hence Vc1=Vi or the input filter transports average value of
input voltage at capacitor.
To reduce the ripple currents to as low as 0.05%, inductors are
coupled together so that the total inductance increases.
18
19. STATE SPACE REPRESENTATION
. If a state space model of the system is drawn,
ẋ = [A][x]+[B][u], Vo = [P][x]
where [A] and [B] are system and control matrices respectively.
. X =[iL1,Il2,Vc1,Vc2]
.On keeping the constraint that ripple currents are minimal and Vl1=Vl2
19
20. The steady-state voltage gain expression of the FOBC are as
........(1)
where,
Va is average value PVA voltage,
Vo is the converter load voltage.
kD
Va
Vo
)12)(1(1)21(2)21(2^
DDDrcDrrrDR
R
k
20
21. PERFORMANCE COMPARISON OF BCIF AND
FOBC TOPOLOGIES
An FOBC and a BCIF, parameters listed in table I were simulated using PSIM,
built and tested.
The source ripple current is slightly higher in FOBC than BCIF.
In both the Converter peak current/voltage stress on the switch and diode is
identical.
21
22. The I2R-losses, contributed by the series resistance of the L1 and C1
elements, in both the converters are almost the same.
Both BCIF and FOBC circuits show almost identical performance, from the
steady-state point of view.
Their efficiencies are also of the same order.
22
23. DISCUSSION OF SIMULATION AND
EXPERIMENTAL RESULTS
A simulation diagram involves a model development of:
1) PVA,
2) converter,
3) load, and
4) MPPT algorithm.
The PVA simulation model is transformed into the PSIM platform with PV system
and converter parameter are listed in table I.
23
24. Parameter BCIF FOBC
L1 60 µH 60 µH
L2 35 µH 35 µH
M -- 30 µH
C1 87 µF 87 µH
C2 220 µF 220 µF
r1 35 mΩ 33 mΩ
r2 20 mΩ 19 mΩ
rC1 200 mΩ 205 mΩ
rc 171 mΩ 174 mΩ
fs 40 kHz 40 kHz
Tsampling
0.185
ms
0.13 ms
∆D 0.68% 0.27%
Parameter Value
Maximum
Power (Pm)
30 W
Open
circuit
voltage
(Voc)
21 V
Short
circuit
current
(Isc)
3 A
MPP voltage
(Vm)
12 V
MPP current
(Im)
2.5 A
Converters Parameters PVA Parameters
TABLE I
24
25. The simulated power tracking characteristics
are reported here for the following cases:
1) Variable solar insolations.
The power o/p of PVA increases with an increase in solar insolation .
Fig.10 simulated power tracking characterictics of PVA against solar
insolation change
25
26. 2 ) Load Disturbances
Variation in the load immediately reflects on the PVA input side and hence its power
output will change accordingly.
However, the presence of MPPT loop brings the operating point back to the original
one, by changing the duty ratio.
Fig.11 simulated power tracking characterictics of PVA against solar load
disturbance
26
27. 3) With Battery Load
The tracking capability of the converter supplying the battery loads are also verified.
.
The resistance offered by the battery must be within the optimal range for which the
converter tracks MP.
Fig.12 simulated power tracking characterictics of PVA with
battery load
27
28. The Experimental power tracking characteristics
are reported here for the following cases:
1) Tracking during starting
Fig.13 Experimental power tracking characterictics of PVA during starting.
28
29. 2) Variable solar insolations
Fig.14 Experimental power tracking characterictics of PVA
against solar insolation change.
29
31. 4) Non nonoptimal/optimal loads.
Converter is capable of tracking MP only when the connected load is within the
optimal range i.e R < Rmp, where Rmp is load at maximum power.
Fig.16 Experimental power tracking characterictics of PVA with
Nonoptimal/optimal load
31
32. 5) With a battery load.
Fig.17 Experimental power tracking characterictics of PVA with battery load.
32
33. Effect of Coupling
Coupling among the existing inductors has reduced the source current ripple to
almost 70% in comparison with the noncoupled case.
Fig.18 FOBC Current drawn from PV array
33
34. CONCLUSION
The measured MPPT efficiency, with the proposed converter, is ranging between 93-98 %.
Use of FOBC reduced the source current ripple in comparison with other buck converter.
The combined PV system was modelled in PSIM and then it’s performance simulated.
Power tracking performance for FOBC are almost identical for both experimental and
simulation.
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35. Reference
[1] MUMMADI VEERACHARY ” Fourth-Order Buck Converter for Maximum Power Point Tracking
Applications” IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS VOL. 47,
NO. 2 APRIL 2011
[2] Sandeep Anand, Rajesh Singh Farswan, Bhukya Mangu, B.G. Fernades, “Optimal charging of
Battery Using Solar PV in Standalone DC System,” Industrial Electronics Magazine , vol.7, no-3,pp.6 –
20, Sep 2013.
[3] Trishan Esram, and Patrick L. Chapman, “Comparison of Photovoltaic Array Maximum Power Point
Tracking Techniques,” IEEE Trans. on Energy Conversion, vol. 22, no. 2, June 2007.
[4] Enslin, J. H. R., Wolf, M. S., Snyman, D. B., and Swiegers, W. Integrated photovoltaic maximum
power point tracking converter. IEEE Transactions on Industrial Electronics, 44, 6 (1997), 769—773.
[5] Esram, T. and Chapman, P. L.Comparison of photovoltaic array maximum power point tracking
techniques.IEEE Transactions on Energy Conversion, 22, 2 (2007), 439—449.
[6] Dr. P.S Bimbhra: “Power electronics”, KHANNA PUBLISHERS, New Delhi,2010.
[7] Dr.B.H.Khan “Non-Conventional Energy Resourses”,TMH New Delhi, 2009.
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