Harmonic Reduction in AC to AC Converter by
Trapezoidal Modulation Technique
increases the fundamental output voltage up to 15% as
compared to conventional Sine PWM. The harmonics in the
output of AC to AC converter is also reduced to a large extent.
Minimum THD has been found to 5% during cyclo-inverter
operation for a frequency range of 500 to 750 Hz. During
cyclo converter operation it reduces to 1.2% for a frequency of
1 Hz. It is in the range of 1 to 2.5 % for a frequency range of
1 to 16.66 Hz which is generally recommended mode of
cyclo-converter. It is therefore advisable to use this technique
for cyclo-converter operation.