Enhanced floating reference frame controller for sensorless control of synchronous machines
AssigneeHoneywell International Inc.
InventorsBulent Sarlioglu, Colin E. Huggett
Life of this patent
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Abstract
A method and system for controlling a power converter coupled to a polyphase power line. The method includes measuring at least two motor phase currents, obtaining a floating reference frame for the current Park vector, adjusting the reference frame based on an estimated rotor speed, and controlling the power converter via the floating reference frame to reinitiate power to a motor while a rotor is still moving.
Claims20
A method for controlling a power converter for coupling to a polyphase power line, the method comprising:
- measuring at least two motor phase currents;
- obtaining a floating reference frame for the current Park vector;
- adjusting the reference frame based on an estimated rotor speed;
- and
- controlling the power converter via the floating reference frame to reinitiate power to a motor while a rotor is still moving.
A method for resynchronizing a synchronous generator during a power interrupt, comprising:
- opening a DC bus main contactor after a converter is powered off;
- measuring back emf voltages via voltage sensors;
- calculating Park vector of the back emf voltage;
- providing the calculated Park vector of the back emf voltage to a floating frame controller;
- and
- estimating an angle and a frequency of the back emf via the floating frame controller.
A method for controlling the power factor of a synchronous machine, comprising:
- measuring a dc link current via a dc current sensor;
- calculating a magnitude of an AC current Park vector and a floating synchronous reference frame;
- and
- controlling an angle command of the AC current Park vector in floating reference synchronous reference frame and controlling the magnitude of the AC current Park vector to adjust a power factor between a terminal voltage and a phase current.
Dependencies are inferred from the claim text.