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AssigneeABB Schweiz AG
InventorsPeter Daehler, Ralf Baechle
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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.
A method for balancing a three-point DC voltage intermediate circuit, in which a converter circuit, which is connected to a first capacitor (C1) and to a second capacitor (C2) in the three-point DC voltage intermediate circuit, influences the electrical power flow in the three-point DC voltage intermediate circuit, and in which an intermediate circuit voltage mean value ({overscore (UDC)}) is formed from a first intermediate circuit voltage (UDC1), which is present across the first capacitor (C1), and from a second intermediate circuit voltage (UDC2), which is present across the second capacitor (C2), wherein the intermediate circuit voltage mean value ({overscore (UDC)}) is monitored for a threshold value (UDCS) which can be predetermined,
An apparatus for carrying out a method for balancing a three-point DC voltage intermediate circuit having a converter circuit which is connected to a first capacitor (C1) and to a second capacitor (C2) of the three-point DC voltage intermediate circuit, and having a drive circuit which has a mean-value forming device for forming an intermediate circuit voltage mean value ({overscore (UDC)}) from a first intermediate circuit voltage (UDC1), which is present across the first capacitor (C1) and from a second intermediate circuit voltage (UDC2), which is present across the second capacitor (C2), with the converter circuit being connected to the drive circuit,
Dependencies are inferred from the claim text.