Uninterruptible power supply system with dynamic bypass power distribution

Abstract

A UPS system (1) comprising a plurality of UPSs (2a-2e) connected in parallel, each UPS comprising a bypass switch (10) and a controller (20), said controller (20) being in communication with the controllers of the other UPSs (2a-2e) and comprising:-a first unit (220) that monitors the current flowing in a bypass line 5 of the UPS of said first unit (220) and determines an effective value of the current intensity,-a second unit (224) that monitors the current flowing in the bypass line 5 of the UPS of said first unit (220) and determines an effective value of the current intensity,-a third unit (224) that monitors the current flowing in the bypass line 5 of the UPS of said first unit (220) and determines the effective value of the current intensity. -a third unit (226) that acquires the effective values of all UPSs for which the bypass switch (10) is closed and defines a reference effective value corresponding to the acquired minimum effective value,-a third unit (226) that determines the delay of the bypass switch (10) for closing said UPSs, the delay being zero if the effective value of the UPS of the controller (20) is equal to the reference effective value, and-a fourth unit (246) that determines the delay of the bypass switch (10) for closing said UPSs if the delay is zero. If the bypass switch (10) is closed, the fourth unit (246) holds the bypass switch (10) closed or opens the bypass switch (10) for a duration corresponding to the delay before closing the bypass switch (10).

Description

technical field [0001] The present invention relates generally to uninterruptible power supplies (UPS) and, more particularly, to an automatic bypass system for distributing power in installations comprising a plurality of uninterruptible power supplies electrically connected in parallel. Background technique [0002] The present invention can be applied to all uninterruptible power supplies with static bypass switches controlled independently phase by phase (ie, using Silicon Controlled Rectifier (SCR) technology). [0003] An uninterruptible power supply (UPS) is an electrical device capable of supplying power to a load even if the quality and / or availability of energy provided by the utility varies. [0004] A conventional on-line UPS utilizes a power factor correction (PFC) circuit to rectify input power supplied by the grid to power a direct current (DC) bus. When mains power is available, the rectified DC voltage is typically used to charge the battery and power the D...

AI Technical Summary

Problems solved by technology

[0027] In the field of UPS, a parallel system is used to take advantage of its redundancy, and the existence of a single point of failure in the system described in US2017 / 0163086 eliminates the possibility of this redundancy, making the parallel system unable to operate, so it is not advisable

Images