ABSTRACT:
Maximum Power
Point Tracking (MPPT) algorithms is conferred in this paper used in
photovoltaic (PV) systems for changing temperature and irradiance conditions.
The MPPT control is always combined with a DC-DC power converter to produce
maximal power under differing metrological conditions. The boost converter is
used along with the Maximum Power Point Tracking control system. Perturb and
Observe (P&O) and Incremental Conductance algorithm (INC) are the two
widely used algorithms for drawing maximal power from the photovoltaic source.
Direct duty ratio control technique is used for both the algorithms. The system
is modeled using MATLAB Simulink software. The simulation result of 50W PV module
produced by the two algorithms are analysed and a comparative study is
presented.
KEYWORDS:
1.
Maximum power point tracking (MPPT)
2.
MATLAB SIMULINK
3.
Photovoltaic (PV)
4.
Perturb and Observe (P&O)
5.
Incremental conductance (INC)
6.
Duty ratio (D)
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig.1.
Block diagram of MPPT control
Fig.2.
Non-linear P-V and I-V curves for 1000 W/m2 at 25ᵒC
Fig.3. I-V and
P-V curves for different irradiance values at 25ᵒC
Fig.4. Waveforms at irradiance values from 400 W/m2 – 800
W/m2 for a
step time of 0.4 seconds at 25ᵒC
Fig.5.
Waveforms at irradiance values from 800W/m2 – 1000 W/m2 for a
step
time of 0.4 seconds at 25ᵒC
Fig.6.Waveforms
at irradiance values from 400 W/m2- 800 W/m2 for a
step
time of 0.4 seconds at 25ᵒC
Fig.7.
Waveforms at irradiance values from 800 W/m2 -1000 W/m2 for a
step
time of 0.4 seconds at 25ᵒC
CONCLUSION:
A mathematical model of a 50W
photovoltaic (PV) panel modeled with MPPT control algorithms is discussed in this
paper. The Perturb and Observe algorithm, and Incremental conductance algorithm
are explained and simulated using the MATLAB Simulink. Here the MPPT control is
achieved by direct duty ratio control of the boost converter which is linked to
the load for its maximum efficiency under varying temperature and irradiance
values of solar PV panel. The Perturb and Observe (P&O) method is simple to
implement. It has slow response during changing atmospheric conditions due to
fixed step size and has a tendency of drifting the operating point towards the
wrong side. These issues are addressed by using Incremental conductance method
(INC) which has a better performance over Perturb and Observe algorithm. It has
a faster response and is more efficient in tracking when the irradiance values are
changing continuously. The steady-state performance of the photovoltaic control
system are improved by using the MPPT algorithms.
REFERENCES:
[1] S.Mekhilef, "Performance of
grid connected inverter with maximum power point tracker and power factor
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2008.
[2] Shridhar Sholapur, K. R. Mohan, T.
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Engineering (IOSR-JEEE), Volume 9, Issue 4 Ver. II (Jul – Aug. 2014), PP
50-56.
[3] Pallavi Bharadwaj, Vinod John, “Direct
Duty Ratio Controlled MPPT Algorithm for Boost Converter in Continuous and
Discontinuous Modes of Operation” Indian Institute of Science Bangalore, India.
[4] Hyeonah Park, Hyosung Kim,” PV cell
modeling on single-diode equivalent circuit”.
[5] Bijit Kumar Dey, Imran Khan, Nirabhra
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