Harmonics: A sinusoidal component of a periodic wave having a frequency that is an integer multiple of the fundamental frequency.
Inter-harmonics: Components with frequencies between two consecutive harmonics or those components whose frequencies are not integer multiples of the fundamental power frequency.
Sub-harmonics: A special subset of interharmonics that have frequency values that are less than that of the fundamental frequency.
Table below illustrate their usage with examples for a 50Hz system.
