2011 International Conference on Alternative Energy in Developing Countries and Emerging Economies
- 248 -
y = -3E-10x
4
+ 4E-07x
3
- 0.0001x
2
- 0.0141x + 14.389
R
2
= 0.4795
0
5
10
15
20
0
100 200 300 400 500 600 700 800
Global Radiation (W/m
2
)
Effciency (%)
y = 0.0155x + 0.021
R
2
= 0.7394
0
2
4
6
8
10
12
14
16
18
20
22
24
0
200
400
600
800
1000
Global Solar Radiation (W/m
2
)
Electric Current (A)
0
5
10
15
20
25
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Month
Efficiency (%)
AverageEfficiency
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
50
100
150
200
250
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Wind Speed (m/s)
Power(W)
Month
PowerWind Turbine Generator
AveragePowerWind Turbine Generator
Wind Speed
AverageWind Speed
Fig. 9. The relation between observed global solar radiation and
calculated efficiency of a-Si PV generator.
Fig. 10. The relationship between global solar radiation and current
produced by 1.028 kWp a-Si PV generator.
Fig. 11.
shows the variation of monthly average wind
speed and power produced by a wind turbine generator.
The monthly average wind speed at 15 m in Phatthalung
province was in the range of 1.7-4.5 m/s. The maximum
and minimum mean speed was 4.5 m/s in August and was
1.7 m/s in November whereas the yearly average wind
speed was 2.9 m/s. The power produced by a wind
turbine generator was in the range of 10-220 W. The
maximum power produced by a wind turbine generator
was 220 W in August whereas the yearly average power
produced by a wind turbine generator was 70 W. The
variation of monthly average efficiency of a wind turbine
generator was shown in Fig. 12. It can be seen that the
monthly average efficiency of a wind turbine generator
was in the range of 1-22%. The maximum monthly
average efficiency was 22% in August. However, the
yearly average efficiency of a wind turbine generator was
7%. Fig. 13. shows the relationship between the wind
speed and the efficiency of a wind turbine generator. It is
clear that the more wind speed the higher the efficiency.
Fig. 13 shows the variation of observed wind speed
and calculated efficiency of wind turbine generator. It
was obvious that the relation between wind speed and
efficiency depended upon the power curve of a wind
turbine generator.
Fig. 11. The variation of monthly wind speed and power produced by a
wind turbine generator.
Fig. 12. The variation of monthly average efficiency of a 1 kW wind
turbine generator operated under wind speed of Phatthalung province,
southern Thailand.
Fig. 13. The relation between wind speed and efficiency of a wind
turbine operated under wind speed of Phatthalung province, southern
Thailand.
Fig. 14 shows the monthly solar and wind fraction for
water pumping system. The experimental results and
simulated results were compared in order to validate the
transient simulation system using TRNSYS 16.01. As
mentioned before that the experimental data could obtain
from November 2009 until April 2010, so the simulated
results were compared to the experimental results during
that period. The percentage absolute error was computed
and found to be 5.16-21.50% for a-Si PV generator while
it was in the range of 1.25-25.52% for a wind turbine
generator.
y = -0.4413x
3
+ 9.0138x
2
- 48.026x + 76.162
R
2
= 0.9912
0
10
20
30
40
50
60
0
2
4
6
8
10
Wind Speed (m/s)
Efficiency of Wind Turbine Generator (%)
