Implementation Of Perturb And Observe MPPT Of PV System with Direct Control
Method Using Buck And Buck boost Converters
ABSTRACT:
The Maximum Power Point Tracking (MPPT) is a
technique used in power electronic circuits to extract maximum energy from the
Photovoltaic (PV) Systems. In the recent decades, photovoltaic power generation
has become more important due its many benefits such as needs a few maintenance
and environmental advantages and fuel free. However, there are two major
barriers for the use of PV systems, low energy conversion efficiency and high
initial cost. To improve the energy efficiency, it is important to work PV system
always at its maximum power point. So far, many researches are conducted and
many papers were published and suggested different methods for extracting
maximum power point. This paper presents in details implementation of Perturb
and Observe MPPT using buck and buck-boost Converters. Some results such as
current, voltage and output power for each various combination have been
recorded. The simulation has been accomplished in software of MATLAB Math works.
KEYWORDS
1. Maximum Power Point Tracking
2. Perturb and
Observe
3. DC-DC Converters
4. Photovoltaic System
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Figure
1. PV module and dc/ dc converter with MPPT
Figure
2. Block diagram of a PV array connected to the load
EXPECTED SIMULATION RESULTS:
Figure
3. Output current, voltage and power of PV panel (insolation changed from 400
to 200 w/ m² at a time of 4.915 sec.)
Figure
4. Output current, voltage and power of buck converter with P&O algorithm
(Insolation
changed from 400 to 200 w/ m² at a time of 4.915 sec.)
Figure
5. output current, voltage and power of PV panel (Insolation changed from 400
to 200 w/ m² at a time of 5.017 sec.)
Figure
6. Output current, voltage and power of buck-boost converter with P&O
algorithm
(Insolation
changed from 400 to 200 w/ m² at a time of 5.017 sec.)
CONCLUSION:
P&O
MPPT method is implemented with MATLAB-SIMULINK for simulation. The MPPT method
simulated in this paper is able to improve the dynamic and steady state
performance of the PV system simultaneously. Through simulation it is observed
that the system completes the maximum power point tracking successfully despite
of fluctuations. When the external environment changes suddenly the system can
track the maximum power point quickly. Both buck and buck-boost converters have
succeeded to track the MPP but, buck converter is much more effective specially
in suppressing the oscillations produced due the use of P&O technique.
REFERENCES:
[1]
A.P.Yadav, S. Thirumaliah and G. Harith. “Comparison of MPPT Algorithms for
DC-DC Converters Based PV Systems” International Journal of Advanced Research
in Electrical, Electronics and Instrumentation Engineering Vol. 1, Issue 1,
July 2012.
[2]
Y.-H.Chang and C.-Y. Chang, "A Maximum Power Point Tracking of PV System
by Scaling Fuzzy Control," presented at International Multi Conference of
Engineers and Computer Scientists, Hong Kong, 2010.
[3]
S.Mekhilef, "Performance of grid connected inverter with maximum power
point tracker and power factor control," International Journal of Power
Electronics, vol.1, pp. 49-62.
[4]
M.E.Ahmad and S.Mekhilef, "Design and Implementation of a Multi Level
Three-Phase Inverter with Less Switches and Low Output Voltage
Distortion," Journal of Power Electronics, vol. 9, pp. 594- 604, 2009.
[5]
H.N.Zainudin and S. Mekhilef, "Comparison Study of Maximum Power Point
Tracker Techniques for PV Systems" Proceedings of the 14th International Middle
East Power Systems Conference (MEPCON’10), Cairo University, Egypt, December
19-21, 2010.
