IEEE Power Electronics Magazine - September 2022 - 52

one of the rectifier diodes is replaced with the MOSFET
to enable the TMC implementation.
Throughout its prognosed lifetime, the microconverter
normally operates as a full-bridge quasi-Z-source
SRC with the full-bridge rectifier. If the fault occurs in
one of the input-side inverter switches, the microconverter
is reconfigured into a single-switch quasi-Z-source
converter. The topology morphing scenario depends on
the operating point and is realized by applying one of the
post-fault modulation sequences [24]. Figure 4 shows the
performance benchmarking of the microconverter coupled
with the 96-cell Silicon PV module before and after
the short-circuit fault of a switch S1. In both cases, the
PV microconverter extracted total energy of 1190 Wh
and showed the same average maximum power point
(MPP) tracking efficiency of more than 99%. However,
the power stage efficiency differs considerably for the
pre- and post-fault operation. Before a fault, it achieves
maximum efficiency of 95% at the maximum input
power, as shown in Figure 4a, which results in the total
47
46
45
44
43
42
41
47
46
45
44
43
42
41
250
200
150
100
50
100
99.5
99
98.5
98
97.5
97
95
90
85
80
75
(a)
PPV
PDC
250
200
150
100
50
100
99.5
99
98.5
98
97.5
97
95
90
85
80
75
0246 810 02468 10
Time, hour
Time, hour
(b)
FIG 4 Experimental benchmarking of the zero-redundancy fault-tolerant PV microconverter coupled with 96-cell PV module using
a clear day mission profile in (a) normal operation and (b) post-fault operation.
52 IEEE POWER ELECTRONICS MAGAZINE z September 2022
PPV
PDC
Converter Efficiency, %
MPPT Efficiency, %
Power, W
Input voltage VPV, V
Converter Efficiency, %
MPPT Efficiency, %
Power, W
Input voltage VPV, V

IEEE Power Electronics Magazine - September 2022

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Contents
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