Simulation and Analysis of Dynamic UPS with Flywheel and Battery Back Up

Exploring the advantages of rotary UPS systems and flywheel energy storage in uninterruptible power supplies

Abstract

In the current historiography the picture of consistent is that the uninterrupted as well as quality power supply. Flywheel energy storage and the battery storage have become one of the attractions in the field of uninterruptable power supplies. Nowadays static UPS systems are preferred for low-power applications, although rotary UPS systems offer some interesting advantages. A rotary UPS uses the inertia of a high-mass spinning flywheel (flywheel energy storage) to provide short-term ride-through the time of power loss. The flywheel also act as a buffer against power spikes and sags, since such short-term power events are not able to appreciably affect the rotational speed of the high-mass flywheel.UPS batteries are sized to provide backup power for periods measured in minutes. The period ranges from about 5 minutes up to around 1 hour, but is commonly about 15 minutes. A period of 15 minutes, more or less, is generally presumed adequate to allow an orderly shutdown of equipment. Flywheels, on the other hand, provide backup power for periods measured in seconds. The backup period for flywheels is commonly about 15 seconds. However, a flywheel alone will not provide backup power for a period long enough to allow an orderly process shutdown in most cases. In such critical conditions use of generator comes into context where a D.G set can entirely provide and can run orderly process plant for at least 12 hours of operation and after some breathing time it can be operated again, time which is sufficient for SEB power to restore.