Fuzzy Logic Application of Steady-state Harmonic Distortion Limits for the Time-varying Harmonics
DOI:
https://doi.org/10.24084/repqj08.401Abstract
Harmonic distortion limits recommended by most
international standards are designed for the steady-state
harmonics, which are typically calculated for planning purpose.
A problem can occur, however, when the limits are applied to
actual time-varying harmonics. This paper proposes a new
fuzzy logic application to apply modified steady-state harmonic
limits using total demand distortion, which is recommended in
the IEEE standard 519-1992, to the actual measured harmonic
distortions which varies with time. Fuzzy logic application can
provide simple and easy implementation and reflect experts’
knowledge. The result of fuzzy logic application indicates how
close the current waveform is to a pure sinusoidal wave shape
and also reveals whether this current harmonic distortion is
within or outside the allowable limits. It is expected that this
application can contribute for future developments of
harmonics monitoring, evaluation, and mitigation strategies in
the actual operating status of power system.
