Unresolved problems in power quality

The Power Quality Centre at the University of Wollongong has been in operation since 1996 and has made progress in many areas of power quality, with power system harmonics being a major focus. The paper will discuss some important issues in harmonics still needing to be resolved, including (i) the economic case for harmonic control, (ii) the setting of appropriate voltage limits, (iii) measurement of time-varying harmonics, (iv) the modelling of distorting loads, (v) allocation of harmonic current and (vi) the identification of harmonic offenders. There is brief mention of other important power quality issues still needing to be addressed.