Harmonic Analysis Basics
Author: Velimir Lackovic
A harmonic-producing load can affect other loads if significant voltage distortion is caused. The voltage distortion caused by the harmonic-producing load is a function of both the system impedance and the amount of harmonic current injected. If the system impedance is low, the voltage distortion is usually negligible in the absence of harmonic resonance. However, if harmonic resonance prevails, intolerable harmonic voltage and currents are likely to result.
The general procedure is to first develop a model that can accurately simulate the harmonic response of the present system and then to add a model of the new addition. Analysis is also commonly done to evaluate alternatives for correcting problems found by measurements.
Only very small circuits can be effectively analyzed without a computer program. Typically, a computer program for harmonic analysis will provide the engineer with the capability to compute the frequency response of the power system and to display it in a number of useful graphical forms. The programs provide the capability to predict the actual distortion based on models of converters, arc furnaces, and other nonlinear loads.
This course provides an introduction to harmonic theory. It addresses various power quality phenomena and explains how electrical systems are modelled for the purpose of harmonic calculations and how harmonic filters are sized.
Once you complete your course review, you need to take a multiple-choice quiz consisting of forty (40) questions to earn 5 PDH credits
This course is intended to provide you with the following specific knowledge and skills:
- Fundamentals of harmonic phenomena and general power quality theory
- Purpose of harmonic study
- System modelling
- Remedial measures (harmonic filter sizing)
- Harmonic standards
Download the Course to review and begin earning your PDH credits.
We provide technical courses for PDH credits that meet Board requirements for Professional Engineers, Geologists and Land Surveyors. This courses is guaranteed to be accepted in AK, AL, AR, GA, IA, IL, ID, IN, KS, KY, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NV, OH, OK, OR, PA, SC, SD, TN, TX, UT, VA, VT, WI, WV, and WY. Before purchasing this course, please confirm that your state Board is listed above.