Upload
delmar02
View
22
Download
8
Embed Size (px)
DESCRIPTION
UPS
Citation preview
Comparison between Dynamic and Static UPS systemItem Static – UPS Dynamic – UPS Result
Reliability Switches, rectifier and inverter extra in the
power-line converting the total power demand
Only three components in the power-
line from the mains to the load
50% higher reliability of the line-interactive diesel
UPS-system
Energy conversion Two times energy conversion No energy conversion Higher efficiency of the line-interactive diesel UPS-
system
Efficiency 92 % Approx. 97% Lower energy consumption during normal operation of
the interactive diesel UPS
Autonomy time Limited due to usage of batteries Unlimited because of usage of a diesel
engine
Diesel UPS-system always available
Total Harmonic distortion
(THD)
THD > 8% THD < 3% Due to the choke coil generator combination an
effective filter is created
THD filters Additional filters are necessary to reduce the
THD to an acceptable level
No additional filters Extra costs for filters with static UPS system
Power factor improvement No power factor improvement by the system Power factor improvement included in
the system. PF = 0,98 at mains side
Extra cost for static UPS for the power factor
improvement equipment
Load characteristics 1,5 x In
Output frequency +/- 5% during genset
operations
>10 x In
Output frequency within 1%
Selectivity of the diesel UPS-system is considerable
higher
Reduction of the energy costs
Peak-shaving Not possible Possible, optional Reduction of the energy costs
Installation space 100% 50% Savings in favour of diesel UPS system with regard to
the building costs (m2)
Air-conditioning Necessary for the battery-room and for de UPS-
system
Not necessary Extra costs for the Static UPS-sytem and higher
operational (yearly) energy cost
Life-time batteries Battery lifetime depends on the type and
quality. Lifetime between 3 to 8 years
Not applicable Depending on autonomy time requested, the re-
investment of the batteries every 3 to 8 years required
Lifetime UPS-system 10-15 years >25 years Lower depreciation cost for diesel UPS-system
Maintenance Higher maintenance due to combination of
static, batteries and a separate Genset
Maintenance reduced to a minimum
level due the line-interactive principal
Lower maintenance cost of diesel UPS-system
Investment Higher investment and operational cost Lower investment and approx. 25%
lower operational cost
Better price/performance for diesel UPS-system