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.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2009-0083187) and by KESRI (R-2007-2-055) which is funded by Ministry of Knowledge Economy.
© 2010, European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ). All rights reserved.
- Fuzzy inference system (FIS)
- Fuzzy logic
- Power quality (PQ)
- Time-varying signals
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering