Instantaneous power floating frame controller
First Claim
1. A method of controlling a power converter of a synchronous machine system, said method comprising:
- sampling phase-current values between said power converter and said synchronous machine;
selecting a reference frame;
regulating a current vector to align with the reference frame, said selected reference frame having a direct-axis component and a quadrature-axis component;
estimating rotor speed and position as a function of instantaneous power, said step of estimating directly deriving rotor angle as a function of instantaneous power to estimate said rotor position;
adjusting said selected reference frame, based on estimated rotor position, to synchronize said selected reference frame with a magnetic axis of said rotor, thereby generating a synchronized floating frame; and
applying said synchronized floating frame to control said power converter.
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Accused Products
Abstract
The present invention relates to a method of controlling a power converter (20) of a synchronous machine system (10), the method comprising sampling phase-current values between the power converter (20) and the synchronous machine (30); selecting a reference frame; regulating a current vector to align with the selected reference frame, the selected reference frame having a direct-axis component and a quadrature-axis component; estimating rotor speed and position as a function of instantaneous power; adjusting the selected reference frame, based on estimated rotor position, to synchronize the selected reference frame with a magnetic axis of the rotor, thereby generating a synchronized floating frame; and applying the synchronized floating frame to control the power converter (20). The present invention also related to a power converter controlling apparatus (100) for controlling a power converter (20) of a synchronous machine system (10) without use of a machine position sensor.
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Citations
22 Claims
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1. A method of controlling a power converter of a synchronous machine system, said method comprising:
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sampling phase-current values between said power converter and said synchronous machine; selecting a reference frame; regulating a current vector to align with the reference frame, said selected reference frame having a direct-axis component and a quadrature-axis component; estimating rotor speed and position as a function of instantaneous power, said step of estimating directly deriving rotor angle as a function of instantaneous power to estimate said rotor position; adjusting said selected reference frame, based on estimated rotor position, to synchronize said selected reference frame with a magnetic axis of said rotor, thereby generating a synchronized floating frame; and applying said synchronized floating frame to control said power converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling a power converter of a synchronous machine drive system, said method comprising
sampling phase-current values between said power converter and said synchronous machine; -
selecting a reference frame; regulating a current vector to align with the reference frame, said selected reference frame having a direct-axis component and a quadrature-axis component; estimating rotor speed and position as a function of instantaneous power; adjusting said selected reference frame, based on estimated rotor position, to synchronize said selected reference frame with a magnetic axis of said rotor, thereby generating a synchronized floating frame; and applying said synchronized floating frame to control said power converter, wherein said regulating step aligns said current vector with the selected reference frame, such that a direct-axis component of said current vector becomes zero; and said adjusting step aligns said selected reference frame and current vector with a voltage vector. - View Dependent Claims (10, 11)
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12. A power converter controlling apparatus for controlling a power converter of a synchronous machine drive system, said controlling apparatus comprising:
a current controller for generating power converter command signals by; sampling phase-current values between said power converter and a synchronous machine; selecting a reference frame; regulating a current vector to align with the reference frame, said selected reference frame having a direct-axis component and a quadrature-axis component; adjusting said selected reference frame, based on estimated rotor position, to synchronize said selected reference frame with a magnetic axis of said rotor, thereby generating a synchronized floating frame; and applying said synchronized floating frame to control said power converter; and a rotor position estimator for generating said estimated rotor position as a function of instantaneous power, said rotor position estimator directly deriving rotor angle as a function of instantaneous power to estimate rotor position. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A power converter controlling apparatus for controlling a power converter of a synchronous machine drive system, said controlling apparatus comprising:
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a current controller for generating power converter command signals by; sampling phase-current values between said power converter and a synchronous machine; selecting a reference frame; regulating a current vector to align with the reference frame, said selected reference frame having a direct-axis component and a quadrature-axis component; adjusting said selected reference frame, based on estimated rotor position, to synchronize said selected reference frame with a magnetic axis of said rotor, thereby generating a synchronized floating frame; and applying said synchronized floating frame to control said power converter; and a rotor position estimator for generating said estimated rotor position as a function of instantaneous power, wherein said current controller regulates said current vector to align with the selected reference frame, such that said direct-axis component of said selected reference frame becomes zero, and aligns said selected reference frame and current vector with a voltage vector. - View Dependent Claims (21, 22)
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Specification