Apparatus for controlling controlled variable of rotary machine to command value

Patent metadata

Field	Value
Publication number	US-9531313-B2
Application number	US-201514716251-A
Country	US
Kind code	B2
Filing date	May 19, 2015
Priority date	May 19, 2014
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

In a control apparatus, an interference-reduction current calculator calculates, as an interference reduction current, a component of a current vector in a coordinate axis in a rotating coordinate system defined with respect to a rotor of the rotary machine. The current vector flows in the rotary machine, and the coordinate axis serves as an interference reduction coordinate axis in which the component of the current vector has reduced interference from change of the phase of the output voltage vector. An amplitude setter sets, as a manipulated variable for feedback controlling the interference reduction current to a command current value based on a command value for a controlled variable, one of: an amplitude of the output voltage vector, and an amplitude parameter indicative of a component of the output voltage vector. The component of the output voltage vector depends on the amplitude of the output voltage vector.

First claim

What is claimed is:

1. An apparatus for feedback controlling a controlled variable of a rotary machine based on a phase of an output voltage vector of a power converter including a switching element, the apparatus comprising:
an interference-reduction current calculator configured to calculate, as an interference reduction current, a component of a current vector flowing in a coordinate axis in a rotating coordinate system defined with respect to a rotor of the rotary machine,
the coordinate axis serving as an interference reduction coordinate axis, the component of the current vector flowing in the interference reduction coordinate axis and having reduced interference from change of the phase of the output voltage vector;
an amplitude setter configured to set, as a manipulated variable for feedback controlling the interference reduction current to a command current value based on a command value for the controlled variable, one of:
an amplitude of the output voltage vector, and
an amplitude parameter indicative of a component of the output voltage vector, the component of the output voltage vector depending on the amplitude of the output voltage vector; and

a switching unit configured to perform switching operations of the switching element of the power converter based on the manipulated variable and the phase of the output voltage vector, thus causing the controlled variable to follow the command value.

2. An apparatus for controlling a controlled variable of a rotary machine based on electric power converted by a power converter including a switching element, the apparatus comprising:
a phase setter configured to set, as a first manipulated variable for feedback controlling the controlled variable to a command value, one of:
a phase of an output voltage vector of the power converter in a rotating coordinate system defined with respect to a rotor of the rotary machine, and
a phase parameter indicative of one of a first component and a second component of the output voltage vector in an orthogonal coordinate system having a first axis and a second axis, the first axis and the second axis being perpendicular to each other, one of the first component and the second component depending on the phase of the output voltage vector;
an interference-reduction current calculator configured to calculate, as an interference-reduction current, a component of a current vector flowing in a coordinate axis in the rotating coordinate system,

the coordinate axis serving as an interference reduction coordinate axis, the component of the current vector flowing in the interference reduction coordinate axis and having reduced interference from change of the phase of the output voltage vector;
an amplitude setter configured to set, as a second manipulated variable for feedback controlling the interference reduction current to a command current value based on the command value, one of:
an amplitude of the output voltage vector, and
an amplitude parameter indicative of the other of the first component and the second component of the output voltage vector in the orthogonal coordinate system, the other of the first component and the second component depending on the amplitude of the output voltage vector; and

a switching unit configured to perform switching operations of the switching element of the power converter based on the first manipulated variable and the second manipulated variable to match the controlled variable with the command value.

3. The apparatus according to claim 2 , wherein, when the first manipulated variable changes by an infinitesimal value so that the current vector changes in a direction, the interference reduction coordinate axis is set to be substantially perpendicular to the changing direction of the current vector.

4. The apparatus according to claim 2 , wherein, when the first manipulated variable changes by an infinitesimal value, the interference reduction coordinate axis is set to be a coordinate axis in which dy/dx becomes zero, dx representing the infinitesimal value, dy representing a change of the current vector resulted from change of the first manipulated variable by the infinitesimal value.

5. The apparatus according to claim 3 , further comprising:
an interference reduction coordinate axis setter configured to set the interference reduction coordinate axis according to at least one of the phase of the output voltage vector and an inductance of the rotary machine,
wherein the interference-reduction current calculator is configured to calculate the interference reduction current using the interference reduction coordinate axis set by the interference reduction coordinate axis setter.

6. The apparatus according to claim 4 , further comprising:
an interference reduction coordinate axis setter configured to set the interference reduction coordinate axis according to at least one of the phase of the output voltage vector and an inductance of the rotary machine,
wherein the interference-reduction current calculator is configured to calculate the interference reduction current using the interference reduction coordinate axis set by the interference reduction coordinate axis setter.

7. The apparatus according to claim 3 , further comprising:
an interference reduction coordinate axis setter configured to set the interference reduction coordinate axis according to at least one of:
a pair of the first component and the second component of the output voltage vector, and
an inductance of the rotary machine,

wherein the interference-reduction current calculator is configured to calculate the influence reduction current using the interference reduction coordinate axis set by the interference reduction coordinate axis setter.

8. The apparatus according to claim 4 , further comprising:
an interference reduction coordinate axis setter configured to set the interference reduction coordinate axis according to at least one of:
a pair of the first component and the second component of the output voltage vector, and
an inductance of the rotary machine,

wherein the interference-reduction current calculator is configured to calculate the influence reduction current using the interference reduction coordinate axis set by the interference reduction coordinate axis setter.

9. The apparatus according to claim 2 , further comprising:
a torque estimator configured to estimate torque generated by the rotary machine as the controlled variable.

10. The apparatus according to claim 2 , wherein:
the amplitude setter is configured to perform feedback control including at least a feedback gain based on a deviation between the interference reduction current and the command current to set the second manipulated variable according to a result of the feedback control, the apparatus further comprising:
an amplitude gain setter configured to variably set the feedback gain of the feedback control according to a setting parameter, the setting parameter including at least one of a rotational velocity of the rotor of the rotary machine, torque generated by the rotary machine, a current flowing in the rotary machine, and the phase of the output voltage vector.

11. The apparatus according to claim 10 , wherein:
the amplitude gain setter is configured to variably set the feedback gain independently of a value of the setting parameter to thereby maintain, at a constant level, a response of the influence reduction current with respect to the command current.

12. The apparatus according to claim 2 , wherein:
the phase setter is configured to perform feedback control including at least a feedback gain based on a deviation between the controlled variable and the command value

Assignees

• Denso Corp

Inventors

• Matsuki Yousuke
• Takahashi Tomoya

Classifications

• H02P21/06

  Rotor flux based control involving the use of rotor position or rotor speed sensors · CPC title

• H02P21/0085 Primary

  specially adapted for high speeds, e.g. above nominal speed · CPC title

• H02P21/22

  Current control, e.g. using a current control loop · CPC title

• H02P21/20

  Estimation of torque · CPC title

• H02P21/0035

  Electricity · mapped topic