Method for disturbance current compensation for an electrical system, and disturbance current compensation device

• US 8,369,059 B2
• Filed: 12/01/2009
• Issued: 02/05/2013
• 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
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): HOANG, ANN THI
• Application Number:
  US12/628,536
• Publication Number:
  US 20100134943A1
• Time in Patent Office: 1,162 Days
• Field of Search: 361/113
• 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 the inductance is connected in series with the capacitance via a conductor, the conductor being connected to or within the series circuit, and the conductor being 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;

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;

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;

producing a compensation current preset value as a function of the voltage on the capacitance of the series circuit 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.

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

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

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

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

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

a regulation device for producing a compensation current preset value as a function of voltage on the capacitance of the series circuit, 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.

4. The disturbance current compensation device as claimed in claim 3, wherein the regulation device comprises:

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

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

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

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

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;

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;

producing a compensation current preset value as a function of the voltage on the inductance of the series circuit 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 of the series circuit; and

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

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

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

a regulation device for producing a compensation current preset value as a function of voltage on the inductance of the series circuit, 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.

8. The disturbance current compensation device as claimed in claim 7, wherein the regulation device comprises:

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

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