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 ...
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3-L DC Link ML Converter Properties 55<br />
4.2.1 5-L ANPC 1 converter states<br />
The 5-L ANPC 1 has 4 commutation cells per phase, 3 of them are in<strong>de</strong>p<strong>en</strong>d<strong>en</strong>t as indicated in<br />
Figure 47. The two cells connected to the DC link need to operate simultaneously to not violate<br />
blocking voltage requirem<strong>en</strong>ts and to provi<strong>de</strong> a reasonable input to the output MC stage.<br />
1<br />
2 3<br />
1<br />
(a)<br />
(b)<br />
(c)<br />
Figure 47, ANPC type 1 with numbered commutation cells (a), sample redundant states for U out<br />
= -U DC/4 (b) and (c), red line indicates conduction, dotted lines indicate paths where switches may<br />
be turned on (but having zero curr<strong>en</strong>t)<br />
The state for a single phase leg is <strong>de</strong>scribed with the binary number b 1b 2b 3, the indices<br />
corresponding with the number of the switching cells, and b1 being the MSB, b3 being the LSB.<br />
The output curr<strong>en</strong>t and the state of the phase leg <strong>de</strong>termine the curr<strong>en</strong>ts in NP and FC as shown in<br />
TABLE 20.<br />
TABLE 20, STATES OF SINGLE PHASE LEG OF THE ANPC 1<br />
State (<strong>de</strong>cimal)<br />
State (binary, Level number and<br />
b 1b 2b 3)<br />
voltage<br />
I NP<br />
I FC<br />
{0} DS {000} BS 0 (-U DC/2) 0 0<br />
{1} DS {001} BS 1 (-U DC/4) 0 +I Out<br />
{2} DS {010} BS 1 (-U DC/4) +I Out -I Out<br />
{3} DS {011} BS 2 (GND) +I Out 0<br />
{4} DS {100} BS 2 (GND) +I Out 0<br />
{5} DS {101} BS 3 (+U DC/4) +I Out +I Out<br />
{6} DS {110} BS 3 (+U DC/4) 0 -I Out<br />
{7} DS {111} BS 4 (+U DC/2) 0 0<br />
Note that level 0 and 4 have no redundant states. Level 1 and 3 have two redundant states each<br />
with differing NP and FC curr<strong>en</strong>ts. Level 2 has two redundant states without impact on NP nor FC<br />
curr<strong>en</strong>t. For a three phase system, we get the following number of available vectors and states: