UPS system having a function of parallel operation

Details UPS system having a function of parallel operation UPS system having a function of parallel operation

2008-08-19

2011-12-13

Fleming, Fritz M (Department: 2836)

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

C307S064000

Reexamination Certificate

active

08076799

ABSTRACT:
A UPS system includes one or more UPS units with identical or different capacities. A control circuit, used to control a DC/AC inverter of the UPS unit, includes a voltage feedback control circuit and a current feedforward control circuit. The voltage feedback control circuit is used to control the amplitude and the waveform of load voltage. The current feedforward control circuit is used to operate the DC/AC inverter of the UPS unit as a virtual fundamental resistor and a virtual harmonic resistor which are serially connected to an output terminal of the DC/AC inverter such that each UPS unit can be distributed to provide an output current according to the capacity ratio of the UPS system.

REFERENCES:
patent: 6445089 (2002-09-01), Okui
patent: 7239043 (2007-07-01), Taimela et al.
patent: 2007/0114852 (2007-05-01), Lin et al.

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