Floating flame controller
First Claim
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1. A method of controlling a power converter coupled to a polyphase power line, the method comprising the steps of:
- measuring line current;
determining a current Park vector from the current measurement;
selecting a reference frame for the current Park vector;
adjusting the reference frame until a quadrature component of a current Park vector in the adjusted reference frame is equal to a predetermined value, whereby a synchronous frame is established; and
using the synchronous frame to control the converter.
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Abstract
A floating frame controller determines a current Park vector, selects a reference frame for the current Park vector, and adjusts the reference frame until a quadrature component of a current Park vector in the adjusted reference frame is equal to a predetermined value, whereby a synchronous reference is established. The synchronous frame is used to control a power converter. The floating frame controller can drive a synchronous machine without the use of rotor position sensors.
40 Citations
16 Claims
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1. A method of controlling a power converter coupled to a polyphase power line, the method comprising the steps of:
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measuring line current;
determining a current Park vector from the current measurement;
selecting a reference frame for the current Park vector;
adjusting the reference frame until a quadrature component of a current Park vector in the adjusted reference frame is equal to a predetermined value, whereby a synchronous frame is established; and
using the synchronous frame to control the converter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating a synchronous machine, the machine having field windings and a rotor, the method comprising the steps of:
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sampling current supplied to the field windings;
generating a current Park vector from the sampled current;
selecting an arbitrary rotor reference frame for the current Park vector;
transforming the current Park vector from a stationary frame to a synchronous frame;
extracting direct and quadrature components of the current Park vector in the synchronous frame;
adjusting the rotor reference frame such that the quadrature component of the current Park vector in the synchronous frame becomes a predetermined value; and
using the synchronous frame to control magnitude of the applied inverter voltage. - View Dependent Claims (9)
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10. A system comprising:
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a power converter;
gate logic for providing a sequence of gating commands to the converter;
current sensors for sampling current on an output of the converter; and
a floating frame controller for the gate logic, the floating frame controller generating a current Park vector from the sampled current, selecting an arbitrary reference frame for the current Park vector;
rotating the reference frame until a quadrature component of a current Park vector in the rotated reference frame is equal to a predetermined value, whereby a synchronous frame is established; and
using the synchronous frame to control the converter.- View Dependent Claims (11, 12, 13, 14, 15)
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16. Apparatus for controlling a power converter according to sampled line current, the controller comprising:
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means for determining a current Park vector from the sampled current;
means for selecting a reference frame for the current Park vector;
means for rotating the reference frame until a quadrature component of current in the rotated reference frame is equal to a predetermined value, whereby a synchronous frame is established; and
means for using the synchronous frame to control the converter.
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Specification