here dc-dc boost converter designed in MATLAB Simulink and MPPT controller designed in 2 methods(P&O and incremental conductance). finally, I connect it to Ac grid via the Dc-Ac converter. this entire system called grid-connected PV system.

1. 1
DC-DC BOOST CONVERTER
TOPOLOGIES & MPPT TECHNIQUES
FOR GRID CONNECTED SOLAR PV
SYSTEM
Guided by:
Dr. Shambhu Sau
Presented by:
Rameshwar(16EE01039)
SES, IIT Bhubaneswar

2. Outlines
• Introduction
• Different topologies of dc-dc converters
• Modeling of boost converter
• Maximum power point tracking(MPPT) methods
• Conclusion
• References
2

3. Introduction
• Solar power, a clean renewable resource with zero emission, has got
tremendous potential of energy which can be harnessed using a
variety of devices. With recent developments, solar energy systems
are easily available for industrial and domestic use with the added
advantage of minimum maintenance.
• MPPT techniques make PV system more efficient and extract
maximum possible output power.
• Grid connected PV system consist DC-DC converter, MPPT
controller and Dc-Ac converter to link PV array to Ac grid.
3

4. Topologies of DC-DC Converter
• DC-DC Boost Converter
• DC-DC Buck Converter
• DC-DC Buck-Boost Converter
4

5. Modeling of boost converter
5
DC-DC boost converter
ON State
OFF State

6. Boost converter output waveform
6
Boost converter waveforms in CCM Boost converter waveforms in DCM

7. Specification of boost converter
𝑉𝑜
𝑉𝑖𝑛
= (
1
1 − 𝐷
)
7
Component Parameter
DC Supply (Vin) 12V
Diode Si
Switch MOSFET
Duty Cycle(D) 0.5
Switching time period (Ts) 0.0002 sec
Switching frequency (Fs) 5 kHz
Output Voltage (Vo) 24V
Output Power 100W
Inductor current ripple (∆𝐼_𝐿) 0.05𝐼_𝐿
Capacitor voltage ripple (∆𝑉_𝑐) 0.05𝑉_𝑐
TABLE 1 SPECIFICATION OF BOOST CONVETER

8. Component selection
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1. Selection of Inductor:
The inductor value of the Boost converter is calculated using
𝐿 =
𝑉𝑖𝑛 × 𝐷
𝑓𝑠 × ∆𝐼𝐿
.
∆𝐼𝐿
𝐼 𝑜
= 0.05
2. Selection of Capacitor:
The capacitor value can be obtained from
𝐶 =
𝐼 𝑜𝑢𝑡 × 𝐷
𝑓𝑠 × ∆𝑉𝑜
Where ∆𝑉𝑜, is the output voltage ripple which is usually considered as 5% of output voltage.
∆𝑉𝑜
𝑉𝑜
= 0.05
From give data we calculate inductor, capacitor, resistor and duty cycle.
L= 2.877 mH, C = 3.472 × 10^(−4) F R=5.76 Ω D=0.5

9. MATLAB Simulink of boost converter
9
MATLAB Simulink of DC-DC Boost converter
Output voltage of Boost converter Output voltage of Boost converter

10. MPPT Techniques
• Hill Climbing/P&O
• Incremental conductance
• Fractional Open-Circuit Voltage
• Fractional Short-Circuit Current
10

11. MPPT using P&O technique
11
P&O algorithm flowchart P&O algorithm approach with P-V curve

12. MATAB Simulink of P&O technique
12
P&O MPPT Implementation in PV system with boost converter
Power at PV array
Power at load

13. Grid connected PV system with
P&O technique
13
MATLAB Simulink of Grid connected PV System with P&O MPPT algorithm

14. Input signal and dc side output
14
output waveforms of Grid connected
PV system with P&O
sun irradiance and temperature

15. Grid side output
15
Grid side output waveforms (phase a) with P&O Grid side power waveforms with P&O

16. MPPT using IC technique
16
Incremental conductance MPPT method flowchart
MATLAB Simulink of IC (incremental conductance)
MPPT method

17. MPPT using IC technique
17
MATLAB Simulink of Grid connected PV System with IC MPPT algorithm

18. Input signal and Dc side output
18
output waveforms of Grid connected PV system with IC
method
Grid connected PV system V_PV,I_PV, and diode
current with IC method

19. Grid side output
19
Grid side power of Grid connected PV with IC methodGrid side output waveforms (phase a) of Grid
connected PV with IC method

20. Conclusion
• Dc-Dc converters play major role in the use of renewable energy especially the solar PV system.
DC-DC converter topologies such as buck, boost and buck-boost integrated with a solar PV
system capable of providing the most efficient DC power for a given load. The unstable,
uncontrolled and downstream gas emissions from solar PV solar panels have been successfully
resolved with transformers. DC-DC converters with MPPT algorithms are also subject to the
power consumption limitations of the PV generating system to extract maximum power output
from the PV configurations in various situations. The benefits and drawbacks of each typologies
are discussed in terms of cost, nutrient, efficiency and its limitations.
• Maximum power point tracking (MPPT) used for extract maximum power of solar PV system.
In this project two MPPT methods Implemented P&O and Incremental Conductance (IC). In
both method voltage of PV module is maximum power point. Current of PV array I_PV varying
with solar irradiance. Power curve of PV system in both methods are looking same and
changing with solar irradiance. If solar irradiance decreases PV power also decrease.
• In grid connected PV system solar irradiance play major role because output power both side
(DC-DC boost converter and AC grid) changing with solar irradiance. Single phase rms voltage
of Grid is remain constant and current wave amplitude is changing with solar irradiance.
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21. References
[1] Ned Mohan, Tore M. Undeland, William P. Robbins, POWER ELECTRONIC : Converters Application and
Design. Minneasoto, John Willey & Sons, Inc., 1989
[2] International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering (An
ISO 3297: 2007 Certified Organization) Vol. 2, Issue 12, DECEMBER 2013
[3] M. S. Ali, S. K. Kamarudin, M. S. Masdar, A. Mohamed. An Overview of Power Electronics Applications in
Fuel Cell Systems : DC and AC Converters. Sci. World J. 2014; 2014: 1–9.
[4] A. Marrekchi, S. Kammoun, S. Sallem, M. B. A. Kammoun. A practical technique for connecting PV
generator to single-phase grid. Sol. Energy. 2015; 118: 145–154.
[5] A.-G. Jacobo, B.-S. Pedro. High-Efficiency DC-DC Converter for Large Input-Voltage Fluctuations in Solar
Applications. Chinese J. Electron. 2015; 24(3): 502–507.
[6] B. Razzaghzadeh, M. Salimi. Analysis of a Bidirectional DC-DC Converter with High Voltage Gain. Bull. EEI.
2015; 4(4): 280–288.
[7] Nor Hanisah Baharudin, T.M.N.T. Mansur, Fairuz Abdul Hamid. Topologies of DC-DC Converter in Solar PV
Applications
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22. Thank you
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