Improved Circuit Model of Photovoltaic Array - courses.cit.cornell.edu

P (W)
60
40
20
1) I = 3.1 A 2) I = 2.6 A 3) I = 2 A
0
0 5 10 15 20 25
V (v)
Fig. 9 P-V family curves with proposed model for different
irradiation levels
B. Classical PV Model
In addition to the proposed PV model, classical PV model
is also carried out for comparison. Simulation results of PV
using classical circuit model are presented in Fig. 10 and Fig.
11.
4
I (A)
3
2
1
International Journal of Electrical Power and Energy Systems Engineering 2:3 2009
0
0 5 10 15 20 25
V (v)
Fig. 10 I-V curve with classical model
60
50
40
P (W) 30
20
10
0
0 5 10 15 20 25
V (v)
Fig. 11 P-V curve with classical model
According to the obtained results, the proposed model offer
better waveforms for I-V and P-V curves. While classical PV
model produces abrupt change in the slope of P-V curve and
I-V curve observed in Fig. 10 and Fig. 11.
C. Mismatched PV Panels
The proposed PV model is also used to simulate
mismatched PV panels when exposed to different solar
irradiance. In this section two mismatched PV panels
connected in series are simulated. The irradiation levels are
adjusted such that the light generated currents are 3 A and 1
A.
2
1
3
188
The corresponding P-V curve is shown in Fig. 12. It is clear
that the curve exhibits two maxima at two different voltage
levels which is similar to what happens in real operation.
P (W)
60
50
40
30
20
10
0
0 5 10 15 20 25 30 35 40
V (v)
Fig. 12 P-V curve of simulated mismatched PV Panels
V. CONCLUSION
This paper presents simplified piecewise linear model for
PV solar panels suitable for power electronics simulation
studies. The proposed circuit model accounts also for the
behaviour of mismatched PV panels. The obtained results
prove the validity of the proposed model to simulate the PV
with considerable accuracy under different operating
conditions.
REFERENCES
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