Method for balancing a three-point DC intermediate circuit,...

Details Method for balancing a three-point DC intermediate circuit,... Method for balancing a three-point DC intermediate circuit,...

2006-06-20

2006-06-20

Sircus, Brian (Department: 2836)

Electrical transmission or interconnection systems

Capacitor

C307S115000, C307S130000

Reexamination Certificate

active

07064460

ABSTRACT:
A method and apparatus for balancing a three point DC voltage intermediate circuit involves a converter circuit which influences an electrical power flow in a three point DC voltage intermediate circuit. An intermediate circuit voltage mean value is formed from a first intermediate circuit voltage across a first capacitor, and from a second intermediate circuit voltage across a second capacitor. Based on an intermediate circuit voltage mean value exceeding a threshold value, the first capacitor is connected by means of the converter circuit to an energy store, and the energy store is then connected by means of the converter circuit to the second capacitor. If the threshold value is significantly undershot, the second capacitor is connected to the energy store by means of the converter circuit, and the energy store is then connected to the first capacitor by means of the converter circuit.

REFERENCES:
patent: RE31208 (1983-04-01), Watanabe
patent: 5621628 (1997-04-01), Miyazaki et al.
patent: 0534242 (1993-03-01), None

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