METHOD FOR DISTURBANCE CURRENT COMPENSATION FOR AN ELECTRICAL SYSTEM, AND DISTURBANCE CURRENT COMPENSATION DEVICE

• US 20100134943A1
• Filed: 12/01/2009
• Published: 06/03/2010
• Est. Priority Date: 12/02/2008
• Status: Active Grant

• Current Assignee: ABB Schweiz AG (ABB Limited)
• Original Assignee: ABB Schweiz AG (ABB Limited)
• Inventors: DAEHLER, Peter, WICKI, Stefan
• Granted Patent: US 8,369,059 B2
• Time in Patent Office: Days
• US Class Current: 361/113
• CPC Class Codes: H02M 1/143 using compensating arrangements for reducing noise from the supply in transmission systems H04B15/005
• CPC Class Codes: H02M 1/15 using active elements

Abstract

An exemplary method is disclosed for disturbance current compensation for an electrical system by a disturbance current compensation device, which electrical system has a voltage source and a series circuit which is connected via a conductor in parallel with the voltage source. The series circuit has an inductance and a capacitance, with the inductance being connected in series with the capacitance via a conductor. To compensate for disturbance currents, the conductor for the connection of the voltage source to the series circuit of the inductance with the capacitance, and/or the conductor of the series circuit between the inductance and the capacitance, can be surrounded by a ring (e.g., a portion of the conductor can be substantially surrounded by the ring) which can be magnetized. The ring includes an air gap of the disturbance current compensation device. A compensation voltage can be applied by magnetization of the ring. The ring can be magnetized by a magnetization coil of the disturbance current compensation device.

Claims

1. A method for current compensation for an electrical system having a voltage source and a series circuit of an inductance and a capacitance connected in parallel with the voltage source wherein a conductor connected to or within the series circuit is surrounded by a ring which can be magnetized and which includes an air gap of a disturbance current compensation device, the method comprising:

magnetizing the ring via a magnetization coil of the disturbance current compensation device; and

applying a compensation voltage, by magnetization of the ring, to the conductor connected to or within the series circuit of the inductance and the capacitance.

2. The method as claimed in claim 1, comprising:

feeding a compensation current into the magnetization coil to magnetize the ring, using a converter unit of the disturbance current compensation device having a multiplicity of drivable power semiconductor switches.

3. The method as claimed in claim 2, comprising:

feeding a compensation current preset value as a function of the voltage on the capacitance using a regulation device of the disturbance current compensation device; and

driving the drivable power semiconductor switches of the converter unit by a drive signal which is formed from the compensation current preset value by a drive circuit for the disturbance current compensation device.

4. The method as claimed in claim 3, comprising:

forming the compensation current preset value by an integration unit in the regulation device from a filtered voltage on the capacitance; and

forming the filtered voltage on the capacitance by a bandpass filter in the regulation device from the voltage on the capacitance.

5. The method as claimed in claim 2, comprising:

producing a compensation current preset value as a function of the voltage on the inductance using a regulation device of the disturbance current compensation device; and

driving the drivable power semiconductor switches of the converter unit by a drive signal which is formed from the compensation current preset value by a drive circuit for the disturbance current compensation device.

6. The method as claimed in claim 5, comprising:

forming the compensation current preset value by an integration unit in the regulation device from a filtered voltage on the inductance; and

forming the filtered voltage on the inductance by a bandpass filter in the regulation device from the voltage on the inductance.

7. A disturbance current compensation device for an electrical system, which electrical system has a voltage source and a series circuit which is connected via a conductor in parallel with the voltage source and has an inductance and a capacitance connected in parallel with the voltage source, the device comprising:

a ring configured for surrounding a conductor connected to or within the series circuit of the inductance with the capacitance, which ring can be magnetized; and

an air gap for application of a compensation voltage by magnetization of the ring via a magnetization coil.

8. The disturbance current compensation device as claimed in claim 7, comprising:

a converter unit, having a multiplicity of drivable power semiconductor switches, connected to the magnetization coil for feeding in a compensation current.

9. The disturbance current compensation device as claimed in claim 8, comprising:

a regulation device for producing a compensation current preset value as a function of voltage on the capacitance, the regulation device being connected via a drive circuit to the drivable power semiconductor switches in the converter unit, to form a drive signal from the compensation current preset value.

10. The disturbance current compensation device as claimed in claim 9, wherein the regulation device comprises:

an integration unit to form the compensation current preset value from a filtered voltage on the capacitance; and

a bandpass filter to form the filtered voltage on the capacitance from the voltage on the capacitance.

11. The disturbance current compensation device as claimed in claim 8, comprising:

a regulation device for producing a compensation current preset value as a function of the voltage on the inductance, the regulation device being connected via a drive circuit to the drivable power semiconductor switches in the converter unit, to form a drive signal from the compensation current preset value.

12. The disturbance current compensation device as claimed in claim 11, wherein the regulation device comprises:

an integration unit to form the compensation current preset value from a filtered voltage on the inductance; and

a bandpass filter to form the filtered voltage on the inductance from the voltage on the inductance.