Method of position sensorless control of an electrical machine
AssigneeVestas Wind Systems A/S
InventorsShu Yu Cao, Bing Li, Anshuman Tripathi
Life of this patent
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Abstract
A position sensorless control methodology for an electrical machine is provided. In particular, one aspect provides a method for position sensorless operation of an electrical machine using direct position error computation from stator flux observation results and stator current measurement.
Claims18
A method for sensorless position control of an electrical machine, the method comprising:
- measuring a stator current of the electrical machine;
- determining a stator flux of the electrical machine from the stator current;
- computing a total rotor position error from at least the stator flux and the stator current;
- determining an estimated raw speed signal from the total rotor position error;
- integrating the raw speed signal so as to derive an estimated angular rotor position of a rotor of the electrical machine;
- and
- applying the estimated angular rotor position to a controller comprising a processor which, in operation, controls the electrical machine responsive to the estimated angular rotor position.
A wind turbine comprising:
- an electrical machine;
- and
- an apparatus for sensorless position control of the electrical machine, the apparatus being adapted to carry out an operation comprising:
- measuring a stator current of the electrical machine;
- determining a stator flux of the electrical machine from the stator current;
- computing a total rotor position error from at least the stator flux and the stator current;
- determining an estimated raw speed signal from the total rotor position error;
- integrating the raw speed signal so as to derive an estimated angular rotor position of a rotor of the electrical machine;
- and
- controlling the electrical machine responsive to the estimated angular rotor position.
A computer-readable medium having a computer program recorded thereon, the computer program comprising instructions which, when executed by a processor, cause the processor perform an operation for sensorless position control of an electrical machine in a wind turbine, the operation comprising:
- measuring a stator current of the electrical machine;
- determining a stator flux of the electrical machine from the stator current;
- computing a total rotor position error from at least the stator flux and the stator current;
- determining an estimated raw speed signal from the total rotor position error;
- integrating the raw speed signal so as to derive an estimated angular rotor position of a rotor of the electrical machine;
- and
- controlling the electrical machine responsive to the estimated angular rotor position.
Dependencies are inferred from the claim text.