Method of position sensorless control of an electrical machine
AssigneeVestas Wind Systems A/S
InventorsShu Yu CAO, Bing LI, Anshuman TRIPATHI, Lars HELLE
Life of this patent
Estimating the term…
Abstract
A position sensorless control methodology for electrical machines using high frequency flux vector signal injection in the estimated rotor flux rotational reference frame is provided. In one aspect, the estimated position error function is derived directly from the stator flux equation without any simplification. The method is applicable for electrical generator motoring mode operation from standstill and power generation mode operation.
Claims15
A method for position sensorless control of an electrical machine, the method comprising:
- generating a flux vector reference signal,
- modulating the flux vector reference signal by injecting a high frequency signal carrier,
- determining a position error function signal from the modulated flux vector reference signal,
- estimating the speed of the rotor,
- estimating an angular position of the rotor from the estimated speed, and
- applying the estimated rotor speed and the estimated angular rotor position to control the electrical machine,
- wherein the flux vector reference signal is generated from a power feedback control signal.
A wind turbine comprising an electrical machine, and an apparatus for position sensorless control of the electrical machine, the apparatus being adapted to carry out an operation, comprising:
- generating a flux vector reference signal,
- modulating the flux vector reference signal by injecting a high frequency signal carrier,
- determining a position error function signal from the modulated flux vector reference signal,
- estimating the speed of the rotor,
- estimating an angular position of the rotor from the estimated speed, and
- applying the estimated rotor speed and the estimated angular rotor position to control the electrical machine,
- wherein the flux vector reference signal is generated from a power feedback control signal.
A computer readable medium having a computer program recorded thereon, computer program comprising instructions which, when executed by a processor, make the processor perform an operation for position sensorless control of an electrical machine in a wind turbine, the operation comprising:
- generating a flux vector reference signal,
- modulating the flux vector reference signal by injecting a high frequency signal carrier,
- determining a position error function signal from the modulated flux vector reference signal,
- estimating the speed of the rotor,
- estimating an angular position of the rotor from the estimated speed, and
- applying the estimated rotor speed and the estimated angular rotor position to control the electrical machine,
- wherein the flux vector reference signal is generated from a power feedback control signal.
Dependencies are inferred from the claim text.