IEEE Power Electronics Magazine - June 2021 - 32

current average values equal zero, whereas a certain amount
of ripple, being caused by the switching, cannot be avoided.
3) Operation at Full Load
Figure 11 presents the converter operating waveforms in
case energy is transferred from AC to DC side (rectifier
vgA vgB
2,000
-2,000
vpA1 vpA2 vnA1 vnA2
5,000
-5,000
igA
75
-75
ipA
-50
inA
-50
VDC
5,000
2,500
5,000
iDC
-25
-50
vApΣ vAnΣ vBpΣ vBnΣ vCpΣ vCnΣ
5,300
5,200
5,100
010203040
Time (ms)
FIG 11 Full-load operation ^ =
Pk .W250 DC
h
32 IEEE POWER ELECTRONICS MAGAZINE z June 2021
5,400
5,200
5,000
050 100 150 200 250 300
Time (ms)
FIG 12 Operating waveforms in case dc voltage reference is
changed from 0 to 5 kV.
-50
-25
-50
vApΣ vAnΣ vBpΣ vBnΣ vCpΣ vCnΣ
5,000
2,500
iDC
inB
inC
-50
VDC
ipB
ipC
-50
inA
inB
inC
igB
igC
75
-75
ipA
ipB
ipC
5,000
-5,000
igA
igB
igC
vgC
2,000
-2,000
vpA1 vpA2 vnA1 vnA2
mode) at nominal power. As the grid currents increase in
amplitude so do the branch currents, which in conjunction
with branch voltages causes branch powers, and inherently
voltages, to oscillate. Similar to the case considering operation
at no load, dc voltage and current contain the
switching ripple, however, with mean values being different
vgA vgB
vgC
(V)
(A)
(V)
(A)
(A)
(A)
(V)
(V)
(V)
(A)
(V)
(A)
(A)
(A)
(V)
(V)

IEEE Power Electronics Magazine - June 2021

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

Contents
IEEE Power Electronics Magazine - June 2021 - Cover1
IEEE Power Electronics Magazine - June 2021 - Cover2
IEEE Power Electronics Magazine - June 2021 - Contents
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