
AC/AC Converters 15-11
• Group II: two output lines are connected to one input line, the remaining output line is connected
to one of the other input lines. Output space vectors have varying amplitude and xed direction
occupying one of six positions regularly spaced 60° apart.
• Group III: all output lines are connected to a common input line. Output space vectors have zero
amplitude.
In the SPVM, the group I vectors are not normally used and the desired output is synthesized from the
group II active vectors and the group III zero vectors, in a similar way to techniques used for inverters.
However, in a matrix converter, the input current must ...