March 2021

It is widely accepted that performing harmonic studies for non-linear applications is important to ensure a workable and energy efficient installation. It is also accepted that these harmonic studies be performed under normal source conditions and maximum operating load. But it is even more critical to perform harmonic modeling and evaluation under unusual or emergency operating conditions, such as when supplied by a backup Generator source.

Sizing prime and backup generator packages for non-linear loads (such as adjustable speed drives (ASDs), solid-state uninterruptible power system, dc drives, and other SCR loads and even single phase loads, such as computer systems, ballasted lighting, and other power electronic loads) is not a simple process.