摘要：High efficiency and low-cost Static Frequency Changer (SFC) converters are widely
used in electronic industry. SFC known as cycloconverter is installed to obtain
variable output AC voltage or frequency. Fast dynamic response and slight size made
these converters to occupy the potential space in switching world. Cycloconverter
generates harmonics when connected to different types of loads. These harmonics
pollute the purity of sinusoidal waveform and affect the quality of power system.
Harmonic current is produced when an electrical device draws current in a nonsinusoidal
manner. The harmonic voltage develops as harmonic current traverses the
electrical system. Harmonic and current orders are inversely proportional to each
other, respectively. These harmonics affect the execution of switching devices and
causes breakdown of cable insulation, circuit breaker tripping, power transformer
failures, limits on generator efficiency and UPS capacity. This paper comprises of
odd harmonics that takes place in different load contiguous with cycloconverter. The
3rd, 5th, 7th and higher order harmonics are diagnosed by employing MATLAB
platform. Simulation studies are depicted and proved the importance of single phase
step down bridge - cycloconverter.
