Abstract
A generalized frequency converter has been realized
which makes use of a cyclo-converter in newer form AC-AC
converter. An attempt has been made to operate this converter
both in a conventional low frequency AC-AC converter and a
new high frequency AC-AC converter. The ability to directly
affect the frequency conversion of power without any
intermediate stage involving DC power is a huge advantage of
the system. The output of this converter has a frequency either
fo = fi × Nr or fo = fi / Nr. where Nr is an integer and fi is the
source frequency. A methodology is developed to generate the
required trigger signal for any integer multiple/sub multiple of
the output frequency. The undesirable harmonic components
in the output of the frequency converter have been minimized
using four modulation techniques namely; sinusoidal pulse
width modulation (SPWM), delta modulation (DM),
trapezoidal modulation (TM) and space vector modulation
(SVM) technique. The converter is simulated using well known
software package MATLAB. Comparative simulation analysis
is presented for a single phase frequency converter (SPFC)
topology with all these modulation techniques when the
converter is operating both step up as well as for step down
mode.