JP2007306694A5

JP2007306694A5 -

Info

Publication number: JP2007306694A5
Application number: JP2006131587A
Authority: JP
Filing date: 2006-05-10
Publication date: 2009-03-05

Claims

A voltage source inverter which outputs three-phase voltage command to the induction motor, a current detector for detecting an output current of the voltage source inverter, biaxial component current Iα on fixed coordinate system the output current, I beta and rotating coordinate system A first coordinate conversion unit that converts the biaxial component currents Id and Iq above, and an excitation current control unit that calculates a voltage command Vd * by controlling the current in the biaxial component current Id direction on the rotating coordinate system ( ACRd), a torque current control unit (ACRq) for controlling the current in the biaxial component current Iq direction on the rotating coordinate system to calculate the voltage command Vq *, and the voltage commands Vd * and Vq * are fixed coordinates system An inverter control device for an induction motor comprising a second coordinate conversion unit that converts the above two-axis component voltage commands Vα *, Vβ * and the three-phase voltage command ,
A sine wave command generator for outputting the excitation current command Id including sinusoidal component *,
A voltage error correction unit that corrects the biaxial component voltage command Vα * on the fixed coordinate system to Vα * ′ using the biaxial component current Iα on the fixed coordinate system;
Inverter control device of an induction motor, characterized in that it comprises a motor constant measuring section for measuring electrical constants of the induction motor using the V.alpha * 'and biaxial component current Iα on the fixed coordinate system.

A voltage source inverter that outputs a three-phase voltage command to the induction motor, a current detector that detects an output current of the voltage source inverter, the biaxial component currents Iα and Iβ on a fixed coordinate system, and a rotating coordinate system A first coordinate converter that converts the biaxial component currents Id and Iq above, and an excitation current controller that calculates the voltage command Vd * by controlling the current in the direction of the biaxial component current Id on the rotating coordinate system ( ACRd), a torque current control unit (ACRq) for controlling the current in the biaxial component current Iq direction on the rotating coordinate system to calculate the voltage command Vq *, and the voltage commands Vd * and Vq * to the fixed coordinate system An inverter control device for an induction motor comprising a second coordinate conversion unit that converts the above two-axis component voltage commands Vα *, Vβ * and the three-phase voltage command,
A sine wave command generator that outputs an excitation current command Id * including a sine wave component;
A voltage error correction unit that corrects the biaxial component voltage command Vα * on the fixed coordinate system to Vα * ′ using the biaxial component current Iα on the fixed coordinate system;
A voltage error measuring unit that measures a voltage error using the biaxial component current Iα on the fixed coordinate system and the biaxial component voltage command Vα * on the fixed coordinate system;
A dead time compensator for correcting a voltage command value to be output to the induction motor using the voltage error;
An inverter control apparatus for an induction motor, comprising: a motor constant measurement unit that measures an electrical constant of the induction motor using the biaxial component current Iα on the fixed coordinate system and the Vα * '.

A voltage source inverter that outputs a three-phase voltage command to the induction motor, a current detector that detects an output current of the voltage source inverter, the biaxial component currents Iα and Iβ on a fixed coordinate system, and a rotating coordinate system A first coordinate converter that converts the biaxial component currents Id and Iq above, and an excitation current controller that calculates the voltage command Vd * by controlling the current in the direction of the biaxial component current Id on the rotating coordinate system ( ACRd), a torque current control unit (ACRq) for controlling the current in the biaxial component current Iq direction on the rotating coordinate system to calculate the voltage command Vq *, and the voltage commands Vd * and Vq * are fixed coordinates system An inverter control device for an induction motor comprising a second coordinate conversion unit that converts the above two-axis component voltage commands Vα *, Vβ * and the three-phase voltage command,
A sine wave command generator that outputs an excitation current command Id * including a sine wave component;
A voltage error measuring unit that measures a voltage error using the biaxial component current Iα on the fixed coordinate system and the biaxial component voltage command Vα * on the fixed coordinate system;
A dead time compensator that corrects the voltage command value to be output to the induction motor using the voltage error;
And a motor constant measuring unit that measures an electric constant of the induction motor using a biaxial component current Iα on the fixed coordinate system and a biaxial component voltage command Vα * on the fixed coordinate system. Inverter control device for electric motor.

The motor constant measurement unit includes a voltage model type magnetic flux calculation unit for calculating a voltage model secondary magnetic flux of the induction motor, an amplitude of the voltage model secondary magnetic flux, and an amplitude of a biaxial component current Iα on the fixed coordinate system. An amplitude value detector for obtaining
The inverter for an induction motor according to any one of claims 1 to 3, wherein a secondary resistance value of the induction motor is measured using the two amplitudes and the frequency of the sine wave component. Control device.

The motor constant measuring unit obtains a phase difference between the voltage model secondary magnetic flux and the biaxial component current Iα on the fixed coordinate system for calculating the voltage model secondary magnetic flux of the induction motor. A phase difference detector,
4. The inverter of an induction motor according to claim 1, wherein a secondary circuit time constant of the induction motor is measured using the phase difference and the frequency of the sine wave component. Control device.

The motor constant measurement unit includes a voltage model type magnetic flux calculation unit for calculating a voltage model secondary magnetic flux of the induction motor, an amplitude of the voltage model secondary magnetic flux, and an amplitude of a biaxial component current Iα on the fixed coordinate system. An amplitude value detector for obtaining
The excitation inductance of the induction motor is measured using the two amplitudes and the frequencies of the sine wave components when the excitation current command Id * is operated with sine wave components of different frequencies. An inverter control apparatus for an induction motor according to any one of claims 1 to 3.

The motor constant measuring unit calculates the voltage model secondary magnetic flux of the induction motor using a voltage model type magnetic flux calculation unit using an integrator and the biaxial component current Iα on the fixed coordinate system. A current model type magnetic flux calculation unit that calculates the current model secondary magnetic flux of the current model, and an offset compensation unit that compensates for the offset of the integrator so that the voltage model secondary magnetic flux and the current model secondary magnetic flux coincide with each other. The inverter control device for an induction motor according to claim 1, wherein the inverter control device is an induction motor.

The motor constant measuring unit uses a voltage model type magnetic flux calculation unit for calculating a voltage model secondary magnetic flux of the induction motor and a current model secondary magnetic flux of the induction motor using a biaxial component current Iα on the fixed coordinate system. And a current model type magnetic flux calculation unit for calculating a voltage, and an R2 correction unit for correcting and calculating a secondary resistance to be measured so that the voltage model secondary magnetic flux and the current model secondary magnetic flux coincide with each other. Item 4. The inverter control device for an induction motor according to any one of Items 1 to 3.

9. The inverter control apparatus for an induction motor according to claim 8 , wherein the R2 correction unit repeats the correction process until a calculation correction amount output from the R2 correction unit becomes a predetermined value or less.

4. The inverter control apparatus for an induction motor according to claim 1, wherein the sine wave command generator outputs an excitation current command Id * including a sine wave component and a direct current component .

4. The sine wave command generation unit outputs an excitation current command Id * including a sine wave component and a DC component, and measures a saturation characteristic of excitation inductance. Induction motor inverter control device.

The inverter control apparatus for an induction motor according to any one of claims 1 to 3, wherein the motor constant measurement unit obtains an excitation inductance by using measured secondary resistance and secondary circuit time constant values. .

The voltage error correction unit, said V.alpha * ', the phase is a biaxial component current Iα the same phase on the fixed coordinate system, amplitude biaxially component voltage command V.alpha * amplitude on the fixed coordinate system, 3. The inverter control apparatus for an induction motor according to claim 1 , wherein the sine wave signal is obtained by subtracting ½ of the difference in magnitude of Vα * before and after the polarity of Iα is inverted.

The voltage error measurement unit sets the voltage error to ½ of the difference in magnitude of the Vα * before and after the polarity inversion of the Iα from the amplitude of the biaxial component voltage command Vα * on the fixed coordinate system. The inverter control device for an induction motor according to claim 2, wherein the inverter control device is obtained.