RECTIFIER AND INVERTER BASED TORSIONAL MODE DAMPING SYSTEM AND METHOD

• US 20130106330A1
• Filed: 03/30/2011
• Published: 05/02/2013
• Est. Priority Date: 04/01/2010
• Status: Abandoned Application

• Current Assignee: Nuovo Pignone SPA (Baker Hughes Company)
• Original Assignee: Nuovo Pignone SPA (Baker Hughes Company)
• Inventors: Schramm, Simon Herbert, Achilles, Alfredo Sebastian, Rotondo, Paola, Sihler, Christof Martin
• Application Number:
  US13/638,846
• Publication Number:
  US 20130106330A1
• Time in Patent Office: Days
• US Class Current: 318/400.15
• CPC Class Codes: H02P 21/05 specially adapted for damping motor oscillations, e.g. for reducing hunting
• CPC Class Codes: H02P 21/13 Observer control, e.g. using Luenberger observers or Kalman filters
• CPC Class Codes: H02P 21/20 Estimation of torque
• CPC Class Codes: H02P 27/06 using dc to ac converters or inverters H02P27/05 takes precedence

Abstract

A torsional mode damping controller system is connected to a converter that drives a drive train including an electrical machine and a non-electrical machine. The controller system includes an input interface configured to receive measured data related to variables of the converter or the drive train and a controller connected to the input interface. The controller is configured to calculate at least one dynamic torque component along a section of a shaft of the drive train based on the measured data from the input interface, generate control data for a rectifier and an inverter of the converter for damping a torsional oscillation in the shaft of the drive train based on the at least one dynamic torque component, and send the control data to the rectifier and to the inverter for modulating an active power exchanged between the converter and the electrical machine.

Claims

1. A torsional mode damping controller system connected to a converter that drives a drive train including an electrical machine and a non-electrical machine, the controller system comprising:

an input interface configured to receive measured data related to variables of the converter or the drive train; and

a controller connected to the input interface and configured to,

calculate at least one dynamic torque component along a section of a shaft of the drive train based on the measured data from the input interface,

generate control data for a rectifier and an inverter of the converter for damping a torsional oscillation in the shaft of the drive train based on the at least one dynamic torque component, and

send the control data to the rectifier and to the inverter for modulating an active power exchanged between the converter and the electrical machine.

2. The controller system of claim 1, wherein the control data α

-modulates the rectifier and β

-modulates the inverter such that the α

-modulation is correlated to the β

-modulation.

3. The controller system of claim 1, wherein the controller is configured to insert in the control data a sinusoidal wave or sinusoidal half-wave to be applied to a rectifier delay angle and to an inverter delay angle.

4. The controller system of claim 3, wherein an amplitude of the sinusoidal wave is less than 3 degrees.

5. The controller system of claim 1, wherein the controller is configured to continuously perform the α

-angle modulation of the rectifier and the β

-angle modulation of the inverter.

6. The controller system of claim 1, wherein the controller is configured to generate the control data based only on measured data related to electrical variables of the converter.

7. The controller system of claim 1, wherein the controller is configured to generate the control data based only on measured data related to mechanical variables of the drive train.

8. The controller system of claim 1, wherein the controller is configured to generate the control data based only on measured data related to mechanical variables of the drive train except the electrical machine.

9. A system for driving an electrical machine that is part of a drive train, the system comprising:

a rectifier configured to receive an alternative current from a power source and to transform the alternative current into a direct current;

a direct current link connected to the rectifier and configured to transmit the direct current;

an inverter connected to the direct current link and configured to change a received direct current into an alternative current;

an input interface configured to receive measured data related to variables of the converter or the drive train; and

a controller connected to the input interface and configured to,

calculate at least one dynamic torque component along a section of a shaft of the drive train based on the measured data from the input interface,

generate control data for the rectifier and for the inverter for damping a torsional oscillation in the shaft of the mechanical system based on the at least one dynamic torque component, and

send the control data to the rectifier and the inverter for modulating an active power exchanged between the converter and the electrical machine.

10. A method for damping a torsional vibration in a drive train including an electrical machine, the method comprising:

receiving measured data related to variables of a converter that drives the electrical machine or the drive train or both the converter and the drive train;

calculating at least one dynamic torque component along a section of a shaft of the drive train based on the measured data;

generating control data for a rectifier and an inverter of the converter for damping a torsional oscillation in the shaft of the drive train based on the at least one dynamic torque component; and

sending the control data to the rectifier and the inverter for modulating an active power exchanged between the converter and the electrical machine.