Damping torsional oscillations in a drive system
AssigneeABB Schweiz AG
InventorsPeter Al-Hokayem, Pieder Joerg
Life of this patent
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Abstract
A drive system includes at least one electrical machine and a plurality of rotating components, which are interconnected via shafts. A method for damping torsional oscillations in the drive system includes: determining angular speeds for at least one of the shafts based on measurements in the drive system; determining a damping torque from the angular speeds with a function that models at least some of the electrical machine, the rotating components and the shafts; adapting a reference torque for the at least one electrical machine by adding the damping torque; and controlling the at least one electrical machine with the adapted reference torques.
Claims20
A method for damping torsional oscillations in a drive system, wherein the drive system comprises at least one electrical machine and a plurality of rotating components, which are interconnected via shafts, the method comprising:
- determining angular speeds (θi) for at least some of the shafts based on measurements in the drive system;
- determining angular speed differences (Δ{circumflex over ({dot over (Θ)})}i) from the angular speeds (θi) with a drive system model, which models the drive system as a number of inertia elements (Ji) interconnected via coupling elements and every angular speed difference (Δ{circumflex over ({dot over (Θ)})}i) refers to a difference of angular speeds at ends of the coupling elements;
- determining a damping torque (Tdamp) from the angular speed differences (Δ{circumflex over ({dot over (Θ)})}i) with a function that models at least some of the electrical machine, the rotating components and the shafts;
- adapting a reference torque (Tref) for the at least one electrical machine by adding the damping torque to determine adapted reference torques (T);
- controlling the at least one electrical machine with the adapted reference torques (T).
A controller including a processor and a set of instructions stored on a memory device executable by the processor effective for damping torsional oscillations in a drive system, the drive system comprises at least one electrical machine and a plurality of rotating components, which are interconnected via shafts, comprising:
- determine angular speeds (θi) for at least some of the shafts based on measurements in the drive system;
- determine angular speed differences (Δ{circumflex over ({dot over (Θ)})}i) from the angular speeds (θi) with a drive system model, which models the drive system as a number of inertia elements (Ji) interconnected via coupling elements and every angular speed difference (Δ{circumflex over ({dot over (Θ)})}i) refers to a difference of angular speeds at ends of the coupling elements;
- determine a damping torque (Tdamp) from the angular speed differences (Δ{circumflex over ({dot over (Θ)})}i) with a function that models at least some of the electrical machine, the rotating components and the shafts;
- adapt a reference torque (Tref) for the at least one electrical machine by adding the damping torque to provide adapted reference torques (T);
- control the at least one electrical machine with the adapted reference torques (T).
Dependencies are inferred from the claim text.