Maximum Power Point Tracking for Photovoltaic System Using Model Predictive Control - Intelligent Computing for Sustainable Energy and Environment - page 522

1200 34

33.5

1000

33

800 32.5

32

600

31.5

400 31

30.5

200

30

0 29.5

0 20 40 60 80 100 120 0 20 40 60 80 100 120

Sampling period Sampling period

Fig. 7. G and T changes form 7.a.m. to 17.p.m. on 7.21.2012

Fig. 8. The output current and output power tracked their reference respectively

At last, the operating point trajectory should be compared with the I-P and
U-I curves to test whether the PV system is working on the MPP. As the Fig.9
shows, the PV system works on the theoretical MPP even though the environ-
ment keeps changing.

I−P U−I

200 12

G=300
G=400
G=500
G=600
G=700
G=800
G=900
G=1000
G=1100
Pout

G=300
G=400
G=500
G=600
G=700
G=800
G=900
G=1000
G=1100
Pout

180

10

160

140

8

120

100 6

80

4

60

40

2

20

0 0

0 2 4 6 8 10 0 5 10 15 20 25 30

Array Current(A) Array Voltage(V)

Fig. 9. Operation points on I-P and U-I curves