In recent years, there has been an increased emphasis on, and concern
for, the quality of power delivered to factories, commercial establishments,
and residences [1.1–1.15]. This is due in part to the preponderance
of harmonic-creating systems in use. Adjustable-speed drives,
switching power supplies, arc furnaces, electronic fluorescent lamp ballasts,
and other harmonic-generating equipment all contribute to the
harmonic burden the system must accommodate [1.15–1.17]. In addition,
utility switching and fault clearing produce disturbances that
affect the quality of delivered power. In addressing this problem, the
Institute of Electrical and Electronics Engineers (IEEE) has done significant
work on the definition, detection, and mitigation of powerquality
events [1.18–1.27].