"Between the harmonics of the power frequency voltage and current, further frequencies can be observed which are not an integer of the fundamental. They can appear as discrete frequencies or as a wide-band spectrum."
IEEE 519 indirectly addresses inter-harmonics by
discussing cyclo-converters which are one of the
primary sources of inter-harmonics on power systems.
IEEE 519 does not however, provide any general
technical description of the phenomena, methods
of measurement, or guidelines for limits.
As the sophistication of power electronic
interfaces to the power system increases, the
frequencies present in the supply current are
less likely to be limited to harmonics of the
fundamental.
The task force will work to develop a paper that summarizes
existing work on inter-harmonics, presents new research by
task force members, and develop suggestions on how
interharmonics should be addressed in IEEE 519.
Specifically, the following items regarding inter-harmonics will be discussed:
It is expected that the body of work developed by the task force will be applied to the next revision of IEEE 519.
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Last updated July 14, 1999 by Erich W. Gunther