Considering the high initial capital cost of photovoltaic (PV) panels and their low conversion efficiency, it is imperative to operate the PV system at the maximum power point (MPP). In this context, our goal in this thesis is to develop and improve the PV system, by contributing to the optimization of energy withdrawn from PV panel using an embedded system. For this purpose, in order to simulate and test MPPT algorithm, the model of the PV panel should be first studied in accordance with the real behavior of the PV panel. Therefore, the single diode model of the PV panel is introduced in Matlab/Simulink and PSIM. Moreover, for the first time, the PV panel model is developed in Proteus; an experimental test bench was built to validate the developed model. On the other hand, this work proposes a modified incremental conductance (INC) algorithm to improve the MPP tracker (MPPT) capability for PV system when the irradiation is suddenly modified. Three modifications are made in the INC algorithm, which are described as follows: (1) A check to identify the increase in irradiation and make a correct decision. (2) Eliminate the all-division computations in the INC algorithm and make the algorithm structure simpler allowing the algorithm to be easily implemented by a low-cost embedded system. (3) A modified variable step INC algorithm is used, which can reduce the steady-state oscillations and improve the tracking speed under sudden irradiance variation. The first modification is simulated using PSIM through “Software in the Loop” test and the results show that the modified algorithm provides an accurate response to a sudden variation of solar irradiation with an efficiency of 98.8 %. The second modification is simulated using the PV panel model proposed in Proteus. For verification, a hardware test bench is implemented by using Arduino Uno board in which the low-cost Atmega328 microcontroller is integrated. This has led to a low-cost PV system with an efficiency of 98.5 %. The third modification is developed following the techniques employed in the automotive and aeronautical embedded system. This is done by following the V-cycle development process, which means that our controller will be validated using “Model in the Loop/Software in the Loop/Processor in the Loop” tests. In this sense, integrating the MPPT embedded system in the automotive or the aeronautical area will be possible. It should be mentioned that Matlab/Simulink is used for MIL/SIL/PIL tests, thus STM32F4 board is used for PIL test. On the other side, if minimizing the cost of the PV system is not important than guarantying a very high level of robustness and efficiency, it is required to use a more powerful method. Therefore in this thesis, we design and implement MPPT based on Kalman Filter. The expected outcome of this proposal is an efficient MPPT method which presents a very high level of robustness, reliability and accuracy. The obtained results clearly highlight the superiority of
Query optimization and processing for advanced database systems
Contribution to the optimization of energy withdrawn from a PV panel using an Embedded System
1. Centre d’Etudes Doctorales : Sciences et Techniques de l’Ingénieur
Soutenance de thèse
en vue de l’obtention du
Doctorat en Sciences et Techniques de l’Ingénieur
Spécialité
Génie électrique
Laboratoire
Laboratoire de Productique Energie et Développement Durable
Au sein de
Presentée et soutenue publiquement par
Mr. Saad Motahhir
Contribution to the optimization of energy withdrawn from a PV panel using an
Embedded System
Sous la direction de
Pr. Abdelaziz El Ghzizal
Pr. Aziz Derouich
31/03/2018
2. 1
2
3
Context and challenges
Thesis contributions
Conclusions & perspectives
Plan
2
Why Renewable energy ?
PV Energy
Problematic
Low-cost Embedded system based control for PV system
MIL/SIL/PIL tests for MPPT algorithm
Improvement of INC algorithm for fast variation of irradiation and test by SIL method
Design Reliable and robust PV system using Kalman filter through SIL method
3. Context and challenges Thesis contributions Conclusions & perspectives
3
Why Renewable energy ? PV Energy Problematic
Demand for
electricity will
double to 2060
Per capita energy
demand will peak
before 2030
The council said that
fossil energy will be
able to provide just 50
percent to 70 percent
of energy demand by
2060.
The phenomenal rise of
solar and wind energy
will continue
4. Context and challenges Thesis contributions Conclusions & perspectives
4
Why Renewable energy ? ProblematicPV Energy
5. Context and challenges Thesis contributions Conclusions & perspectives
5
High cost of solar panels
Why Renewable energy ? ProblematicPV Energy
Consequences
Low operational cost (cost of maintenance)
Reducing future CO2 emissions
Inexhaustible resource
One load can absorb the maximum PV power
6. Context and challenges Thesis contributions Conclusions & perspectives
6
Problem
Why Renewable energy ? ProblematicPV Energy
R
+
-
V
PVpanel
7. Context and challenges Thesis contributions Conclusions & perspectives
7
Why Renewable energy ? ProblematicPV Energy
α
I
V
MPPT Controller
Converter
DC/DC
Load
1
O
V
V
1O
I I
1 ²
1 ²O
in
O
VV
R R
I I
MPPT find the optimum α to have Rin= Rmpp
Solution
8. Context and challenges Thesis contributions Conclusions & perspectives
8
Experimental study Low-cost Embedded system based control for PV system
Design Reliable and robust PV system using Kalman filter through SIL method
Review on the most used MPPT algorithms
Model PV panel on Proteus
Model PV panel on PSIM
Improvement of INC algorithm for fast variation of irradiation using SIL method
MIL/SIL/PIL tests for MPPT algorithm
9. Context and challenges Thesis contributions Conclusions & perspectives
Review on the most used MPPT algorithms
MPPT
Direct
methods
Perturb &
Observe
Incremmental
conductance
Indirect
méthods
Fractional
Short-Circuit
Current
Fractional
Open-Circuit
Voltage
artificial
intelligence
méthods
Fuzzy Logic
Artificial
Neural
Network
9
10. Context and challenges Thesis contributions Conclusions & perspectives
Review on the most used MPPT algorithms
10
Choice of MPPT algorithm
Efficiency
Steady-state
oscillations
Implementation
complexity
Tracking Speed
True MPPT
Cost
11. Context and challenges Thesis contributions Conclusions & perspectives
11
The most used MPPT algorithms
MPPT
Category
True MPPT
Steady-
state
oscillations
Efficiency
Tracking
Speed
Analog/digital
Implementati
on Complexity
Sensors Cost
Fractional Short Circuit
Current
Indirect [1] No [3] No [5] Low [1] Fast [2] Both [2] Simple [2] I [6] Cheap [2]
Fractional open circuit
voltage
Indirect [1] No [3] No [5] Low [1] Fast [2] Both [2] Simple [2] V [6] Cheap [2]
P&O and hill climbing
method
Direct [1] Yes [3] Yes [5]
Medium
[1]
Slow [2] Both [2] Simple [2]
I and V
[6]
Medium [2]
Incremental conductance
method
Direct [1] Yes [3]
Sometimes
[5]
Good [1]
Medium
[2]
Digital [2] Medium [2]
I and V
[6]
Expensive
[7]
Fuzzy logic
Soft
computing [1]
Yes [3] No [4]
Very good
[1]
Fast [2] Digital [2] Complex [2]
I and V
[6]
Very
Expensive
[2]
Neural network
Soft
computing [1]
Yes [3] No [4]
Very good
[1]
Fast [2] Digital [2] Complex [2] Varies [6]
Very
Expensive
[2]
Review on the most used MPPT algorithms
13. Context and challenges Thesis contributions Conclusions & perspectives
13
Drawbacks of Incremental conductance
Review on the most used MPPT algorithms
1. Its complexity to be implemented due to the.
mathematical division calculations used in its
construction.
2. Fixed step size.
3. Incorrect decision under sudden increase of
irradiation.
14. Context and challenges Thesis contributions Conclusions & perspectives
14
PV panel model on PSIM
Modeling the PV panel on PSIM
Modeling Iph
Id
I
Ish
+
-
VRsh
Rs
D
𝑰 = 𝑰 𝒑𝒉 − 𝑰 𝒐 𝒆𝒙𝒑
𝒒 𝑽 + 𝑹 𝒔 𝑰
𝒂𝑲𝑻𝑵 𝒔
− 𝟏 −
(𝑽 + 𝑹 𝒔 𝑰)
𝑹 𝒔𝒉
Where:
𝑰 𝒑𝒉 = 𝑰 𝒔𝒄 + 𝑲𝒊 𝑻 − 𝟐𝟗𝟖. 𝟏𝟓
𝑮
𝟏𝟎𝟎𝟎
𝑰 𝟎 =
𝑰 𝒔𝒄 + 𝑲𝒊(𝑻 − 𝟐𝟗𝟖. 𝟏𝟓)
𝐞𝐱𝐩
𝒒 𝑽 𝒐𝒄 + 𝑲 𝒗 𝑻 − 𝟐𝟗𝟖. 𝟏𝟓
𝒂𝑲𝑻𝑵 𝒔
− 𝟏
The I-V characteristic PV panel is represented by the following equations :
1
2
3
15. Context and challenges Thesis contributions Conclusions & perspectives
15
Results
I‐V and P‐V characteristics of model and experimental data.
Modeling the PV panel on PSIM
16. Context and challenges Thesis contributions Conclusions & perspectives
16
Results
I‐V and P‐V curves for different values of irradiance
Modeling the PV panel on PSIM
17. Context and challenges Thesis contributions Conclusions & perspectives
17
Results
I‐V and P‐V curves for different values of temperature
Modeling the PV panel on PSIM
18. Context and challenges Thesis contributions Conclusions & perspectives
18
PV panel model on Proteus
Modeling the PV panel on Proteus
19. Context and challenges Thesis contributions Conclusions & perspectives
19
Measurement setup
Modeling the PV panel on Proteus
20. Context and challenges Thesis contributions Conclusions & perspectives
20
Results
I-V and P-V characteristics for simulation and experimental data
Modeling the PV panel on Proteus
21. Context and challenges Thesis contributions Conclusions & perspectives
21
Low-cost Embedded system based control for PV system
I I
V V
I I
V V
I I
V V
at MPP
left to MPP
right to MPP
0)/()( VVVIIV
0)/()( VVVIIV
0)/()( VVVIIV 0)( VIIV
0/)( VVIIV
0/)( VVIIV
and 0V
0Vand
and
and
at MPP
left to MPP
left to MPP
right to MPP
right to MPP
0)( VIIV
0V
0V
0)( VIIV
0)( VIIV
0)( VIIV
0)( VIIV
22. Context and challenges Thesis contributions Conclusions & perspectives
22
Low-cost Embedded system based control for PV system on Proteus
Low-cost Embedded system based control for PV system
Prix : 2 $
23. Context and challenges Thesis contributions Conclusions & perspectives
23
Simulationresults
INC
Mod INC
Low-cost Embedded system based control for PV system
87 µs
0.27 s
24. Context and challenges Thesis contributions Conclusions & perspectives
24
Experimental results
Low-cost Embedded system based control for PV system
INC
Mod INC
25. Context and challenges Thesis contributions Conclusions & perspectives
25
Comparison between our work and some experimental works published recently
Paper, Publication
year
PV Power at
STC
MPPT algorithm Controller used
Power
ripples
Efficiency
Response
time
Cost of
controller
[14], (2014) 80 W Modified INC Xilinx XC3S400 FPGA 2.7 W 98.8 % 2.5 ms 38.5 $
[15], (2014) 210 W
Adaptive P&O-
fuzzy MPPT
DSP TMS320F28335 1 W 95.2 % 20 ms 21.17 $
[16], (2014) 40 W
TS fuzzy-based
INC
Embedded controller
dsPIC33fJ128MC802
1W 97.5 % 2 s 4.46 $
[17], (2015) 87 W Modified INC
Microcontroller
PIC18f4520
1.3 W 99 % 0.275 s 4.26 $
[18], (2017) 10 W
FLC
MPPT
dSPACE-1103 0.9 W 97.295 % 0.264 s 38 $
[18], (2017) 10 W
Improved
INC
dSPACE-1103 1 W 91.93 % 0.254 s 38 $
Our work 20 W Modified INC Atmega 328 0.5 W 98.5% 0.1 s 2 $
Low-cost Embedded system based control for PV system
26. Context and challenges Thesis contributions Conclusions & perspectives
26
MIL/SIL/PIL tests for MPPT algorithm
0
P
Offset Ofsset
V
Modified INC algorithm (Variable step size)
27. Context and challenges Thesis contributions Conclusions & perspectives
27
MIL/SIL/PIL tests for MPPT algorithm
At voltage source region, ΔV is very low; as a result the
ΔP/ΔV steps will be large.
At current source region:
dP dI
I V
dV dV
SC
dP
I
dV
High steady-state power oscillations
dP/dV is unable to achieve adaptive stepping
Modified INC algorithm (Variable step size)
28. Context and challenges Thesis contributions Conclusions & perspectives
28
To overcome this problem, a modified variable step-size is used, which depends only on (ΔP).
1Offset Ofsset P
MIL/SIL/PIL tests for MPPT algorithm
Modified INC algorithm (Variable step size)
29. Context and challenges Thesis contributions Conclusions & perspectives
29
Model in the loop/Software in the loop/Processor in the loop tests for embedded system
MIL/SIL/PIL tests for MPPT algorithm
30. Context and challenges Thesis contributions Conclusions & perspectives
30
Result of Model in the loop test
MIL/SIL/PIL tests for MPPT algorithm
31. Context and challenges Thesis contributions Conclusions & perspectives
31
Result of Software in the loop test
MIL/SIL/PIL tests for MPPT algorithm
C code
32. Context and challenges Thesis contributions Conclusions & perspectives
32
Result of Processor in the loop test
MIL/SIL/PIL tests for MPPT algorithm
33. Context and challenges Thesis contributions Conclusions & perspectives
33
Comparison between the proposed work and some existing works in the area of PV
Reference,
Publication
year
Variable step Controller
used
Power
ripples
Response
time
Efficiency
[11], (2014) Choose between ΔD1
and ΔD2
Xilinx
XC3S400
FPGA
2.7 W 2.5 ms 98.8 %
[12], (2015) Step=N* abs (ΔP/ΔV) PIC18F4520 2 W 0.4 s 97.97 %
[13], (2015) Step=N* abs (ΔP/(ΔV- ΔI)) dsPIC30F4011 2 W 0.5 s 98 %
Our Work Offset=Offset1* abs (ΔP) STM32F407VG neglected 0.02 s 98.8%
MIL/SIL/PIL tests for MPPT algorithm
34. Context and challenges Thesis contributions Conclusions & perspectives
34
INC algorithm (Incorrect decision under sudden increase of irradiation)
Improvement of INC algorithm for fast variation of irradiation
35. Context and challenges Thesis contributions Conclusions & perspectives
35
Modified INC algorithm
Improvement of INC algorithm for fast variation of irradiation
36. Context and challenges Thesis contributions Conclusions & perspectives
36
Software-in-the-loop test for the Mod INC using PSIM software
Software-in-the-loop test for the Mod INC using PSIM software
Improvement of INC algorithm for fast variation of irradiation
37. Context and challenges Thesis contributions Conclusions & perspectives
37
Results & comparison
P&O INC
Mod INC
Improvement of INC algorithm for fast variation of irradiation
38. Context and challenges Thesis contributions Conclusions & perspectives
38
Results & comparison
Work Oscillations
level
Efficiency Response time during
sudden increase in
irradiation
Incorrect decision
under sudden increase
of irradiation
Conventional 2.5 W 96 % Slow Yes
[8], 2016 1 W 96.40 % Fast No
[9], 2013 1.5 W 98.5 % Fast Yes
[10], 2014 1 W 97.5 % Medium Yes
Our work Neglected 98.8 % Very fast No
Improvement of INC algorithm for fast variation of irradiation
39. Context and challenges Thesis contributions Conclusions & perspectives
39
Kalman filter
Design the MPPT algorithm using Kalman filter
Important and used everywhere: GPS (predict update location), machine vision (track targets) ,radar and more.
40. Context and challenges Thesis contributions Conclusions & perspectives
40
Kalman filter
Design the MPPT algorithm using Kalman filter
Q : Process noise
𝑥 𝑘
−
: State estimate at k given by
former iterations.
𝑥 𝑘−1: State estimate at k-1 given
by measurement output.
𝑃𝑘
−
: Priori error covariance.
𝑃𝑘−1: Posteriori error covariance.
A & B & H : Constants.
R : Measurement noise
covariance.
𝐾𝑘: Kalman gain.
𝑢 𝑘−1: Input.
41. Context and challenges Thesis contributions Conclusions & perspectives
41
Kalman filter based MPPT
1
1 1
k
k k k
P
V V M
V
The prediction state:
1k kP P Q
1
k k kK P P R
,k k k in k kV V K V V
1k k kP K P
The measurement update
Design the MPPT algorithm using Kalman filter
42. Context and challenges Thesis contributions Conclusions & perspectives
42
Software-in-the-loop test for the Kalman filter based MPPT using PSIM software
Design the MPPT algorithm using Kalman filter
Software-in-the-loop test for the Kalman filter based MPPT using PSIM software
43. Context and challenges Thesis contributions Conclusions & perspectives
43
Results
Results under stable weather condition
INC Kalman
Design the MPPT algorithm using Kalman filter
44. Context and challenges Thesis contributions Conclusions & perspectives
44
Results
Results under variable solar irradiation
200W/m²
800 W/m²
1000
W/m²
1000
W/m²
500 W/m²
800 W/m²
200W/m²
1000 W/m²
800 W/m²
500 W/m²
800 W/m²
1000 W/m²
INC Kalman
Design the MPPT algorithm using Kalman filter
45. Context and challenges Thesis contributions Conclusions & perspectives
45
Results comparison
Results comparison between the proposed method and INC algorithm
Design the MPPT algorithm using Kalman filter
Irradiance (W/m2)
Kalman filter based MPPT INC algorithm
Response time
(ms)
Efficiency (%) Oscillations (W)
Response time
(ms)
Efficiency (%)
Oscillatio
ns (W)
1000 5 99.38 0.8 30 96.64 3
500 4 99.25 0.4 24 96.72 1.6
800 5 99.23 0.7 29 96.62 2.7
46. Context and challenges Thesis contributions Conclusions & perspectives
46
Results comparison
Design the MPPT algorithm using Kalman filter
MPPT
Category
True MPPT
Steady-
state
oscillations
Efficiency
Tracking
Speed
Analog/digital
Implementation
Complexity
Sensors Cost
Fuzzy logic
Soft
computing [1]
Yes [3] No [4]
Very good
[1]
Fast [2] Digital [2] Complex [2]
I and V
[6]
Very
Expensive
[2]
Neural network
Soft
computing [1]
Yes [3] No [4]
Very good
[1]
Fast [2] Digital [2] Complex [2]
Varies
[6]
Very
Expensive
[2]
Kalman basaed MPPT Direct [1] Yes [3] No
Very Good
[1]
Very fast Digital [2] Medium [2] I and V Expensive
47. 47
Low-cost Embedded system based
control for PV system
MIL/SIL/PIL test for
MPPT algorithm
Reliable and robust PV
system using Kalman filter
Conclusion
47
1
2
3
4
PV panel Model on Proteus
48. Propose a flexible PV panel model on Proteus.
Design an improved MPPT method for tracking the MPP under partial
shading condition.
Extended Kalman filter based MPPT.
48
Suggestions for Future Work
49. 49
Journal Publications
1. Motahhir, S., Hammoumi, A. E., Ghzizal, A. E., & Derouich, A. (2019). Open hardware/software test bench for
solar tracker with virtual instrumentation. Sustainable Energy Technologies and Assessments (Elsevier), 31, 9-
16.
2. Motahhir, S., Chalh, A., El Ghzizal, A., & Derouich, A. (2018). Development of a Low-cost PV System using an
improved INC algorithm and a PV panel Proteus model. Journal of cleaner Production (Elsevier), 204, 355-365.
3. Motahhir, S., El Hammoumi, A., & El Ghzizal, A. (2018). Photovoltaic system with quantitative comparative
between an improved MPPT and existing INC and P&O methods under fast varying of solar irradiation. Energy
Reports (Elsevier), 4, 341-350.
4. El Ouanjli, N., Motahhir, S., Derouich, A., El Ghzizal, A., Chebabhi, A., & Taoussi, M. (2019). Improved DTC
strategy of doubly fed induction motor using fuzzy logic controller. Energy Reports, 5, 271-279.
5. EL Hammoumi A., Motahhir S., EL Ghzizal A., Chalh A., Derouich A. (2018). A simple and low-cost active dual-axis
solar tracker. Energy Science & Engineering (Wiley). 6(5), 607-620.
6. Chalh, A., Motahhir, S., El Hammoumi, A., El Ghzizal, A., & Derouich, A. (2018). Study of a Low-Cost PV Emulator
for Testing MPPT Algorithm under Fast Irradiation and Temperature Change. Technology and Economics of
Smart Grids and Sustainable Energy (Springer Nature), 3(1), 11.
7. Motahhir, S., Aoune, A., El Ghzizal, A., Sebti, S., & Derouich, A. (2017). Comparison between Kalman filter and
incremental conductance algorithm for optimizing photovoltaic energy. Renewables: Wind, Water, and Solar
(Springer Nature), 4(1), 8.
50. 50
Journal Publications
8. El Hammoumi, A., Motahhir, S., Chalh, A., El Ghzizal, A., & Derouich, A. (2018). Low-cost virtual instrumentation of
PV panel characteristics using Excel and Arduino in comparison with traditional instrumentation. Renewables:
Wind, Water, and Solar (Springer Nature), 5(1), 3.
9. Motahhir, S., El Ghzizal, A., Sebti, S., & Derouich, A. (2017). MIL and SIL and PIL tests for MPPT
algorithm. Cogent Engineering (Taylor and Francis), 4(1), 1378475.
10.Motahhir, S., El Ghzizal, A., Sebti, S., & Derouich, A. (2018). Modeling of photovoltaic system with modified
incremental conductance algorithm for fast changes of irradiance. International Journal of Photoenergy
(Hidawi), 2018.
11.Motahhir, S., Chalh, A., Ghzizal, A., Sebti, S., & Derouich, A. (2017). Modeling of photovoltaic panel by using
proteus. Journal of Engineering Science and Technology Review, 10, 8-13.
12.Motahhir, S., El Ghzizal, A., Sebti, S., & Derouich, A. (2016). Shading effect to energy withdrawn from the
photovoltaic panel and implementation of DMPPT using C language. International Review of Automatic Control
(Prize), 9(2), 88-94.
51. 51
Conferences
Motahhir, S., El Ghzizal, A., Sebti, S., & Derouich, A. (2015). Proposal and Implementation of a novel perturb and
observe algorithm using embedded software. 3rd International Renewable and Sustainable Energy Conference
(IRSEC), (pp. 1-5). IEEE.
Aoune, A., Motahhir, S., El Ghzizal, A., Sebti, S., & Derouich, A. (2016). Determination of the maximum power point in
a photovoltaic panel using Kalman Filter on the environment PSIM. International Conference on Information
Technology for Organizations Development, (pp. 1-4). IEEE.
Chalh, A., Motahhir, S., EL Hammoumi, A., El Ghzizal, A. and Derouich A. (2017). A low-cost PV Emulator for testing
MPPT algorithm, The International Conference on Renewable Energy and Energy Efficiency.
Motahhir, S., El Ghzizal, A., Sebti, S., & Derouich, A. (2015, November). Une ressource pédagogique pour
l'enseignement par simulation: cas des panneaux photovoltaïques. International Workshop on Pedagogic Approaches
& E-Learning.
Motahhir, S., El Ghzizal, A., & Derouich, A. (2015, May). Modélisation et commande d'un panneau photovoltaïque
dans l'environnement PSIM. Congrès International de Génie Industriel et Management des Systèmes.
IEEE Conference Publications
International Conferences
53. 53
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55. Centre d’Etudes Doctorales : Sciences et Techniques de l’Ingénieur
Soutenance de thèse
en vue de l’obtention du
Doctorat en Sciences et Techniques de l’Ingénieur
Spécialité
Génie électrique
Laboratoire
Laboratoire de Productique Energie et Développement Durable
Au sein de
Presentée et soutenue publiquement par
Mr. Saad Motahhir
Contribution à l’optimisation de l’énergie soutirée des panneaux photovoltaïques
par un système embarqué
Sous la direction de
Pr. Abdelaziz El Ghzizal
Pr. Aziz Derouich
31/03/2018
57. 57
Please cite this work as:
Motahhir, S.(2018). Contribution to the optimization of energy withdrawn
from a PV panel using an Embedded System. (doctoral dissertation). Sidi
mohammed ben abdellah University, Fez, Morocco.
For more papers and works please visit :
https://www.researchgate.net/profile/Saad_Motahhir
Editor's Notes
Apres on a simulé l’algorithme MPPT base sur Kalman et INC sous une valeur constant de lirr
Apres on a simulé l’algorithme MPPT base sur Kalman et INC sous diffirente valeur de lirr