Method and apparatus for estimating angles in a synchronous machine
First Claim
1. An apparatus for estimating angles in a synchronous machine, the apparatus comprising:
- an angle sensor device which is designed to determine event-discrete measured values for a rotor angle of a rotor of the synchronous machine and to output a measurement signal dependent on the determined measured values;
an estimation device which is designed to record current and/or voltage signals from the synchronous machine, to calculate a deviation of the rotor angle of the rotor of the synchronous machine from an expected rotor angle on the basis of the recorded current and/or voltage signals and to output a deviation signal dependent on the calculated deviation; and
a combining device which is designed to receive the measurement signal and the deviation signal and to calculate an estimated value for the rotor angle of the rotor of the synchronous machine from a combination of the measurement signal and the deviation signalwherein the combining device includes a Kalman filter or an observer structure which has a prediction device, which is designed to calculate a prediction value for the state vector of a dynamic model of the rotor, and a correction device which is designed to calculate a correction signal on the basis of the prediction value.
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Abstract
The invention relates to an apparatus for estimating angles in a synchronous machine (11), having an angle sensor device (15) which is designed to determine event-discrete measured values for a rotor angle (φ) of a rotor of the synchronous machine (11) and to output a measurement signal dependent on the determined measured values, an estimation device (16) which is designed to record current and/or voltage signals from the synchronous machine (11), to calculate a deviation (Δφ) of the rotor angle (φ) of the rotor of the synchronous machine (11) from an expected rotor angle on the basis of the recorded current and/or voltage signals and to output a deviation signal dependent on the calculated deviation (Δφ), and a combining device (17) which is designed to receive the measurement signal and the deviation signal and to calculate an estimated value ({circumflex over (φ)}) for the rotor angle (φ) of the rotor of the synchronous machine (11) from a combination of the measurement signal and the deviation signal.
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Citations
9 Claims
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1. An apparatus for estimating angles in a synchronous machine, the apparatus comprising:
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an angle sensor device which is designed to determine event-discrete measured values for a rotor angle of a rotor of the synchronous machine and to output a measurement signal dependent on the determined measured values; an estimation device which is designed to record current and/or voltage signals from the synchronous machine, to calculate a deviation of the rotor angle of the rotor of the synchronous machine from an expected rotor angle on the basis of the recorded current and/or voltage signals and to output a deviation signal dependent on the calculated deviation; and a combining device which is designed to receive the measurement signal and the deviation signal and to calculate an estimated value for the rotor angle of the rotor of the synchronous machine from a combination of the measurement signal and the deviation signal wherein the combining device includes a Kalman filter or an observer structure which has a prediction device, which is designed to calculate a prediction value for the state vector of a dynamic model of the rotor, and a correction device which is designed to calculate a correction signal on the basis of the prediction value. - View Dependent Claims (2, 3, 4, 5)
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6. A method for estimating angles in a synchronous machine, of the method comprising:
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determining event-discrete measured values for a rotor angle of a rotor of the synchronous machine with the aid of an angle sensor; recording current and/or voltage signals from the synchronous machine and calculating a deviation of the rotor angle of the rotor of the synchronous machine from an expected rotor angle; calculating an estimated value for the rotor angle of the rotor of the synchronous machine by combining the determined measured values and the calculated deviation, wherein calculating the estimated value is carried out in a Kalman filter or an observer device; calculating a prediction value for the state vector of a dynamic model of the rotor; determining whether there is an up-to-date measured value; calculating a correction signal for the prediction value on the basis of the up-to-date measured value if there is an up-to-date measured value; and calculating a correction signal for the prediction value on the basis of the calculated deviation if there is no up-to-date measured value. - View Dependent Claims (7, 8, 9)
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Specification