Electrotechnical Systems

160 Electrotechnical Systems

It is obvious that MC states have to be selected in the every sector that correspond to

the input phase-to-phase voltages that do not change their signs and are maximum

byamplitude.

For example, we want to realize the vector 4 (Figure 4.74) and the voltage input

vector is in the rst sector (Figure 4.75). The state vectors ±1, ±2, ±3 are directed

along the vector 4. The states ±2 are dened by the voltage U

pbc

that changes its sign

in the rst sector, the states −1 and +3 give the “negative” value (i.e., the correspond-

ing voltage vectors align with the state vector 3), and the possible states +1 и −3

remain. At that ...