Classification of uninterruptible power supplies

What is an uninterruptible power supply (UPS) system?

Power distortions such as power interruptions, voltage sags and swells, voltage spikes, and voltage harmonics can cause severe impacts on sensitive loads in the electric systems. Uninterruptible power supply (UPS) systems are used to provide uninterrupted, reliable, and high-quality power for these sensitive loads.

What are the different types of uninterruptible power supplies?

There are two main categories of uninterruptible power supplies (UPSs) 1, static and rotary. As the name implies, static UPSs do not have any moving parts in their con-verters. Whereas, rotary UPS use mechanical parts that rotate, such as motor/gen-erators, to function. This paper focuses only on static UPSs.

What is a rotary uninterruptible power system?

A UPS is normally referred to as an uninterruptible power supply, but it’s also known as uninterruptible power system. Note that rotary UPS are covered in IEC 88528-11:2004 Reciprocating internal combustion engine driven alternating current generating sets - Part 11: Rotary uninterruptible power systems - Perfor-mance requirements and test methods.

Are negative impedance dynamics possible in UPS systems with constant power loads?

Negative impedance dynamics in UPS systems with constant power loads are also introduced. Finally, this paper concludes with a brief outline of the advancement to be made in the future. Conferences > APEC. Seventeenth Annual IEEE...