Environmental Engineering Reference
In-Depth Information
Measured
S
+
T
under Fixed hermal Difference
and Varying Solar Irradiance
600
Measured
S
+
T
(380 lux)
Measured
(425 lux)
Measured
S
+
T
(680 lux)
Measured
S
+
T
500
(1010 lux)
hermal (DT5)
Solar (380 lux)
Solar (425 lux)
Solar (680 lux)
Solar (1010 lux)
S
+
T
400
300
200
100
0
0
1
2
3
4
5
6
7
8
Voltage (V)
Measured
S
+
T
under Fixed hermal Difference
and Varying Solar Irradiance
600
Measured
S
+
T
(380 lux)
Measured
(425 lux)
Measured
S
+
T
(680 lux)
Measured
S
+
T
500
(1010 lux)
hermal (DT5)
Solar (380 lux)
Solar (425 lux)
Solar (680 lux)
Solar (1010 lux)
S
+
T
400
300
200
100
0
0
50
100
150
200
Loading Resistance (kΩ)
FIGURE 5.26
P-V and P-R curves of an HEH system at fixed thermal differences of
T
= 5Kand varying solar
irradiances of 380 to 1010 lux.
around 3.6 V. Reviewing all the power curves shown in
Figures 5.24
to
5.27
,
it can be observed that all the MPPs of the P-V curves tend to cluster around
a fixed voltage of 3.6 V, whereas the MPPs of the P-R curves are scattered in
the range of 20 to 50 k
. Hence, by deliberately setting the terminal voltage
of the hybrid energy harvester to a value in the peak power range (
V
R
L
,mppt
=
3.6 V), it is possible to extract maximum output power from the hybrid energy
harvester with a simple and ultralow-power control circuit to place the panel
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