Christoph Haederli - Les thèses en ligne de l'INP - Institut National ...
Christoph Haederli - Les thèses en ligne de l'INP - Institut National ...
Christoph Haederli - Les thèses en ligne de l'INP - Institut National ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
152 Application and Verification<br />
TABLE 63, FEATURES OF THE DIFFERENT NP CONTROL SCHEMES (PART 2)<br />
CM /<br />
Impact on<br />
losses<br />
NP curr<strong>en</strong>t<br />
range (I max<br />
– I min,<br />
measure for<br />
controlability)<br />
Harmonic<br />
performance<br />
in stead<br />
state (NP<br />
control not<br />
active)<br />
Output<br />
voltage<br />
distortion<br />
wh<strong>en</strong> NP<br />
control<br />
active<br />
DC link<br />
dim<strong>en</strong>sioning<br />
(Note 1)<br />
Implem<strong>en</strong>tation,<br />
computational<br />
effort at runtime<br />
Optimal<br />
sequ<strong>en</strong>ce<br />
occasional<br />
jumps /<br />
medium loss<br />
increase<br />
above<br />
standard<br />
range for all<br />
load angles<br />
(Note 2)<br />
WTHD is<br />
slightly higher<br />
than for<br />
CSVM, but<br />
still better<br />
than many<br />
other<br />
modulation<br />
schemes<br />
No increase<br />
compared to<br />
steady state<br />
Dep<strong>en</strong>ds<br />
highly on<br />
prediction<br />
horizon,<br />
theoretically<br />
smaller DC<br />
link possible<br />
Complex<br />
algorithms<br />
(prediction and<br />
optimization),<br />
high<br />
computational<br />
effort<br />
ANPC 3<br />
smooth<br />
modulation,<br />
good<br />
switching loss<br />
distribution<br />
above<br />
standard<br />
range for all<br />
load angles<br />
According to<br />
base<br />
modulation<br />
scheme<br />
No increase<br />
compared to<br />
steady state<br />
Smaller DC<br />
link possible<br />
simple, low<br />
computational<br />
effort<br />
SMC A<br />
(Note 3)<br />
smooth<br />
modulation,<br />
good<br />
switching loss<br />
distribution<br />
above<br />
standard<br />
range for all<br />
load angles<br />
According to<br />
base<br />
modulation<br />
scheme<br />
No increase<br />
compared to<br />
steady state<br />
Smaller DC<br />
link possible<br />
simple, low<br />
computational<br />
effort<br />
SMC B<br />
(Note 3)<br />
Simultaneous<br />
commutations<br />
required,<br />
losses<br />
increase<br />
above<br />
standard<br />
range for all<br />
load angles<br />
According to<br />
base<br />
modulation<br />
scheme<br />
No increase<br />
compared to<br />
steady state<br />
Smaller DC<br />
link possible<br />
simple, low<br />
computational<br />
effort<br />
SMC FC<br />
(Note 3)<br />
Pure FC<br />
operation<br />
with doubled<br />
commutation<br />
voltage and<br />
increased<br />
losses<br />
NP curr<strong>en</strong>t is<br />
zero<br />
Significantly<br />
increased<br />
distortion<br />
Significantly<br />
increased<br />
distortion<br />
Smaller DC<br />
link possible<br />
simple, low<br />
computational<br />
effort<br />
Note 1: The comm<strong>en</strong>ts on DC link dim<strong>en</strong>sioning only refer to the constraints imposed by NP controllability for a<br />
specific modulation scheme. In reality, other constraints may be dominant (e.g. <strong>en</strong>ergy for ri<strong>de</strong> through).<br />
Note 2: standard range refers to the physical limitation of the NP curr<strong>en</strong>t for a 3-L NPC in optimum modulation<br />
(without virtual vectors) as introduced in paragraph 4.7.1.2.<br />
Note 3: SMC A, SMC B, and SMC FC have distinctive properties. Best overall performance can be achieved if all<br />
three are combined within a giv<strong>en</strong> modulation scheme. (See also implem<strong>en</strong>tation of hysteresis modulator in chapter 1.)