Distributed Vs Centralized UPS System

1. What are the advantages and disadvantages of both design?

2. Is cascading of UPS advisable or applicable?

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  • Initial ******** *****, dollars per kVA is likely to be lower due to larger cells, as well as shared components like cases, power conditioners, electronics etc.
  • Less ****** ******** need be purchased. Buying smaller individual units means rounding up to the next highest capacity model on every unit. For instance requiring 600 kVa but having to buy a 800 kVA model.
  • Power *** *** ** *********** ***********. In a central UPS during an outage, decisions can be made depending on the circumstances and the prognosis for power resumption, to limit power reserves to certain areas over others. All reserves could be directed just to a keeping critical servers running after 10 minutes, say. In a distributed system, it's every UPS for themselves.
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  • More *********** ******, with distributed UPSes determining how long each zone will last can be complicated with various vendors equipment and capacities. For example it may not help if the video wall stays on 30 minutes if the VMS servers only last 20.

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  • No *** ****** ********* since units are presumably close to their targets. On the other hand Centralized UPSes still need to deliver the power to where it is consumed. Depending on the topology this can be a large expense in adding dedicated, discrete circuits.
  • ***-***Growth Distributed UPSes can be organically added as a company grows. Centralized UPS requirements need to be carefully forecast at time of first purchase. The penalties for overshooting or underestimating can be large.

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