Control device for alternating current rotary machine

Patent metadata

Field	Value
Publication number	US-9553532-B2
Application number	US-201214368082-A
Country	US
Kind code	B2
Filing date	Sep 26, 2012
Priority date	Jan 24, 2012
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

A control device for AC rotary machine includes a current vector detection section ( 3 ), a magnetic flux vector detection section ( 9 ), an adaptive observation section ( 8 ), a control section ( 4 ), a voltage application section ( 5 ), a deviation vector calculation section ( 6 ) for outputting a current deviation vector and a magnetic flux deviation vector, and a deviation amplification section ( 7 ). The adaptive observation section ( 8 ) calculates an estimated current vector, an estimated magnetic flux vector, and an estimated position, based on a voltage instruction vector and an amplified deviation vector. Further, the control section ( 4 ) superimposes a high-frequency voltage vector, and the magnetic flux vector detection section ( 9 ) calculates a detected magnetic flux vector, based on a magnitude of a high-frequency current vector having the same frequency component as the high-frequency voltage vector, included in a detected current vector, and on a magnitude of a rotor magnetic flux.

First claim

The invention claimed is:

1. A control device for an AC rotary machine, comprising:
a current vector detection section for detecting a detected current vector from current of the AC rotary machine;
a magnetic flux vector detection section for detecting a rotor magnetic flux vector from the detected current vector of the AC rotary machine and outputting the rotor magnetic flux vector as a detected magnetic flux vector;
an adaptive observation section for outputting an estimated current vector, an estimated magnetic flux vector, and an estimated position of the AC rotary machine obtained from an estimated angular velocity of the AC rotary machine:
a control section for outputting a voltage instruction vector so that the detected current vector coincides with a current instruction vector;
a voltage application section for applying voltage to the AC rotary machine, based on the voltage instruction vector;
a deviation vector calculation section for outputting a current deviation vector which is a deviation between the estimated current vector and the detected current vector, and a magnetic flux deviation vector which is a deviation between the estimated magnetic flux vector and the detected magnetic flux vector; and
a deviation amplification section for amplifying the current deviation vector and the magnetic flux deviation vector and outputting the amplified vectors as an amplified deviation vector,
wherein the adaptive observation section calculates the estimated current vector, the estimated magnetic flux vector, and the estimated angular velocity, based on the voltage instruction vector and the amplified deviation vector, and outputs the estimated current vector, the estimated magnetic flux vector, and the estimated position obtained from the estimated angular velocity, and
further, the control section outputs a voltage instruction vector on which a high-frequency voltage vector having a frequency component different from a frequency for driving the AC rotary machine is superimposed, and the magnetic flux vector detection section calculates and outputs the detected magnetic flux vector, based on a magnitude of a high-frequency current vector having the same frequency component as the high-frequency voltage vector, included in the detected current vector, and on a magnitude of a rotor magnetic flux.

2. The control device for an AC rotary machine according to claim 1 , wherein the control section outputs a voltage vector on which an alternating-voltage high-frequency voltage vector is superimposed, and the magnetic flux vector detection section calculates and outputs the detected magnetic flux vector, based on, the high-frequency current vector, at least one of a magnitude of a component parallel to the alternating-voltage high-frequency voltage vector and a magnitude of a component orthogonal to the alternating-voltage high-frequency voltage vector, and on a magnitude of a rotor magnetic flux.

3. The control device for an AC rotary machine according to claim 2 , wherein the detected magnetic flux vector outputted from the magnetic flux vector detection section is composed of a component parallel to the alternating-voltage vector and a component orthogonal to the alternating-voltage vector.

4. The control device for an AC rotary machine according to claim 1 , wherein the control section outputs a voltage vector on which a rotational-voltage high-frequency voltage vector is superimposed, and the magnetic flux vector detection section resolves the high-frequency current vector into an orthogonal coordinate system at rest composed of α axis and β axis, and calculates and outputs the detected magnetic flux vector, based on a magnitude of an α-axis direction component and a magnitude of a β-axis direction component of the high-frequency current vector, and on a magnitude of the rotor magnetic flux.

5. The control device for an AC rotary machine according to claim 4 , wherein the detected magnetic flux vector outputted from the magnetic flux vector detection section is composed of the α-axis direction component and the β-axis direction component.

6. The control device for an AC rotary machine according to claim 1 , wherein the deviation amplification section is configured to change an amplification gain for amplifying the current deviation vector and the magnetic flux deviation vector, in accordance with an estimated velocity of the AC rotary machine calculated by the adaptive observation section.

7. The control device for an AC rotary machine according to claim 1 , wherein the AC rotary machine includes one of a synchronous machine or an induction machine.

8. A control device for an AC rotary machine, comprising:
a current vector detection section for detecting a detected current vector from a current of the AC rotary machine;
a magnetic flux vector detection section for detecting a rotor magnetic flux vector from the detected current vector of the AC rotary machine and outputting the rotor magnetic flux vector as a detected magnetic flux vector;
an adaptive observation section for outputting an estimated current vector, an estimated magnetic flux vector, and an estimated position of the AC rotary machine;
a control section for outputting a voltage instruction vector so that the detected current vector coincides with a current instruction vector;
a voltage applier that applies voltage to the AC rotary machine, based on the voltage instruction vector;
a deviation vector calculation section for outputting a current deviation vector which is a deviation between the estimated current vector and the detected current vector, and a magnetic flux deviation vector which is a deviation between the estimated magnetic flux vector and the detected magnetic flux vector; and
a deviation amplification section for amplifying the current deviation vector and the magnetic flux deviation vector and outputs the amplified vectors as an amplified deviation vector, wherein
the adaptive observation section calculates and outputs the estimated current vector, the estimated magnetic flux vector, and the estimated position, based on the voltage instruction vector and the amplified deviation vector, and
further, the control section outputs a voltage instruction on which a high-frequency voltage vector having a frequency component different from a frequency for driving the AC rotary machine is superimposed, and the magnetic flux vector detection section calculates an angular difference between an axis that is parallel to the estimated magnetic flux vector and an axis that is parallel to the rotor magnetic flux vector based on a magnitude of a high-frequency current vector having the same frequency component as the high-frequency voltage vector, included in the detected current vector, and calculates and outputs the detected magnetic flux vector, based on the angular difference and a magnitude of a rotor magnetic flux.

9. The control device for an AC rotary machine according to claim 8 , wherein
the control section outputs a voltage vector on which an alternating-voltage high-frequency voltage vector is superimposed, and
the magnetic flux vector detection section calculates the angular difference between the axis that is parallel to the estimated magnetic flux vector and the axis that is parallel to the rotor magnetic flux vector based on the high-frequency current vector, at least one of a magnitude of a component parallel to the high-frequency voltage vector and a magnitude of a component orthogonal to the high-frequency voltage vector, and calculates and outputs the detected magnetic flux vector based on the angular difference and a magnitude of a rotor magnetic flux.

10. The control device for an AC rotary machine according to claim 9 , where

Assignees

• Ito Masato
• Hachiya Yosuke
• Terashima Satoru
• Mitsubishi Electric Corp

Inventors

• Ito Masato
• Hachiya Yosuke
• Terashima Satoru

Classifications

• H02P21/141

  Flux estimation · CPC title

• H02P21/24

  Vector control not involving the use of rotor position or rotor speed sensors · CPC title

• H02P21/18

  Estimation of position or speed · CPC title

• H02P6/183 Primary

  using an injected high frequency signal · CPC title

• H02P6/182

  using back-emf in windings · CPC title