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what is the use of capacitor in online ups?
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Answer Posted / nagesh.patwari
Not All UPSs Must Have Input Harmonic Filter Capacitors
Though almost all UPS systems use capacitors in their output, one UPS topology demonstrates that reliance on capacitors in the input is not required. Delta Conversion UPS configurations are now gaining wide acceptance as a means to assure maximum compatibility and stability of engine generators without adding large input capacitor-based harmonic filters.
Instead, this design applies two bidirectional power converters so that the primary delta converter acts like an active harmonic filter, maintaining less than 5% THD current distortion from no load to full load, without the use of capacitor-based filters. The UPS maintains power factor at an ideal unity PF, never falling leading or causing voltage problems on the generator.
The double conversion UPS consists of a one-direction rectifier/battery charger driving a one-direction inverter that powers the critical load.
The two converters of the Delta Conversion UPS are bidirectional, enabling the UPS to aid in the engine-generator's stability. These two converters are controlled so that, as a load, the delta conversion is a constant unity power factor load of a sine wave form from no load to full load And, the Delta Conversion UPS achieves this ideal unity power factor and low input harmonic distortion without the need of a large input capacitor bank.
Both capacitors I/p and o/p - AC AND DC Capacitor in UPS ARE USED FOR VTG FILTRATION OR SMOOTH OUTPUT POWER
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