Redundant uninterruptible power supply systems

Abstract

A system (100) is provided. The system includes a utility (122), a plurality of uninterruptible power supplies (UPSs) (104,106,108,110), a ring bus (132), at least one load (124,126,128,130) electrically coupled to the plurality of UPSs and the ring bus, and a controller (200) communicatively coupled to the plurality of UPSs, the controller configured to determine a common reference angle while the utility is disconnected from at least one UPS (104) of the plurality of UPSs, calculate a phase angle for each UPS of the plurality of UPSs, wherein the phase angle for each UPS is calculated relative to the common reference angle, and control operation of each UPS based on the respective calculated phase angles.

Description

[0001] Related Application Cross Reference [0002] This application is a non-provisional application claiming priority to US Provisional Patent Application Serial No. 61 / 951,281, filed March 11, 2014, entitled "REDUNDANT UNINTERRUPTIBLE POWER SUPPLY SYSTEMS," which is incorporated herein by reference in its entirety. technical field [0003] The field of the invention relates generally to uninterruptible power supplies, and more particularly to implementing uninterruptible power supplies in a ring bus architecture. Background technique [0004] A healthy power system is capable of supplying power to one or more loads. These power systems may include a combination of generation, transmission, rectification, inversion and conversion of power to supply energy for electronic, optical, mechanical and / or nuclear applications and loads. When implementing power systems and architectures, practical considerations include cost, size, reliability, and ease of implementation. [000...

AI Technical Summary

Problems solved by technology

If the sources are out of sync with each other, they may start to override each other, causing oscillations or other undesired effects that affect the power delivered to one or more loads

Further, the common reference angle for one UPS may drift if the individual UPSs are all operating relative to a common reference angle and a utility becomes disconnected from at least one of the individual UPSs, become different from the common reference angle of another UPS, which may affect the load sharing and stability of the power system

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