IEEE Power Electronics Magazine - September 2021 - 51

with a rating of 600 V, 35 mF was chosen [10] to sustain the
SPV system load during the transient moment. The complete
algorithm for the proposed scheme is given in Figure 4.
Results and Discussions
The proposed MPPT method was developed as a hardware
prototype of a 4.6 kW lab scale setup. The SPV array was
operated with vPV of 300 V and iSC of 25 A. In order to obtain
a sufficient number of data points (6000) for smooth and
accurate I-V and P-V curve tracing, 500 kilo samples were
acquired in 2 ms.
Selecting an optimum capacitor rating with minimal
damping is an important factor in the proposed design.
This is because parasitic elements of the SPV array and
capacitor play a vital role in obtaining an oscillation free
current waveform. Likewise, it is well known that as the
capacitance increases, the oscillations reduce. However,
increasing the capacitance value may increase the power
loss as well as time taken for sweeps. Hence it is evident
that capacitor sizing must be examined. Consequently, the
current and voltage plots for 45 µF, 470 µF and 1000 µF values
of capacitors were tested and are shown in Figure 5.
For this prototype, an electrolytic type capacitor rated at a
value of 600 V, 45 µF was selected as the load capacitor for
implementing the proposed MPPT method.
The proposed circuit is shown in Figure 6 and its experimental
results are showcased in Figure 7. MPPT under
uniform insolation conditions are seen in Figure 7(a),
G-1
Junction Box Terminals
X
X
vPV
G-3
R
PV
String
G-2
Y
Y
vC
iC
Display Driver
(a)
G-1
iPV
X
vPV
G-3
PV
String
G-2
Y
(b)
R
S
D
GaN-2
iC
Gnd
B
G-2
Y
(c)
FIG 3 Proposed single point MPPT technique. (a) Proposed circuit configuration. (b) Capacitor charging condition. (c) Capacitor discharging
condition through electronic load.
September 2021 z IEEE POWER ELECTRONICS MAGAZINE 51
D
iC
C
vC
vUC
PV
String
R
D
GaN-2
S
iC
Gnd
B
D
GaN-3
S
S
iUC
A
X
vPV
G-3
iPV
D
S
D
GaN-3
iC
C
vC
S
iUC
vUC
A
G-1
Graphical
Display
Sensor and
Control Circuit
Gate Driver
G-1
G-2
G-3
D
GaN-2
S
iC
Gnd
PWM Signals to Inverter
B
vC
iPV
D
D
GaN-3
S
S
iUC
A
C
vUC
Junction Box Terminals
GaN-1
Junction Box Terminals
Inverter dc Bus Terminals
Junction Box Terminals
GaN-1
GaN-1
Inverter dc Bus Terminals
Inverter dc Bus Terminals

IEEE Power Electronics Magazine - September 2021

Table of Contents for the Digital Edition of IEEE Power Electronics Magazine - September 2021

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