Power converter control device

Patent metadata

Field	Value
Publication number	US-11031898-B2
Application number	US-201716753944-A
Country	US
Kind code	B2
Filing date	Nov 30, 2017
Priority date	Nov 30, 2017
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

A power converter control device performs PWM control for power converters which respectively supply power to a plurality of winding groups of a multiplex-winding electric motor including the plurality of winding groups, the power converter control device including a PWM control unit which performs control while selectively switching among an asynchronous PWM control mode using a carrier not synchronized with voltage commands for respective winding groups and both or one of a first synchronous PWM control mode in which voltage commands for respective winding groups are subjected to PWM control using a carrier synchronized with a voltage command for a specific winding group, and a second synchronous PWM control mode in which voltage commands for respective winding groups are subjected to PWM control using respective carriers synchronized with the respective voltage commands.

First claim

The invention claimed is:

1. A power converter control device for performing PWM control for power converters which respectively supply power to a plurality of winding groups of a multiplex-winding electric motor including the plurality of winding groups, the power converter control device comprising:
a PWM controller configured to perform the PWM control while switching between an asynchronous PWM control mode using a carrier for the PWM control that is not synchronized with three-phase voltage commands for driving the multiplex-winding electric motor, and a synchronous PWM control mode using a carrier for the PWM control that is synchronized with the three-phase voltage commands for driving the multiplex-winding electric motor, wherein
the synchronous PWM control mode includes at least one of a first synchronous PWM control mode in which voltage commands for the respective winding groups of the multiplex-winding electric motor are subjected to the PWM control using a carrier synchronized with a voltage command for a specific winding group, and a second synchronous PWM control mode in which voltage commands for the respective winding groups of the multiplex-winding electric motor are subjected to the PWM control using respective carriers synchronized with the respective voltage commands, and
the PWM controller performs control while selectively switching between the asynchronous PWM control mode, and both or one of the first synchronous PWM control mode and the second synchronous PWM control mode, on the basis of an operation state of the multiplex-winding electric motor.

2. The power converter control device according to claim 1 , wherein
in the first synchronous PWM control mode, phase correction according to a phase difference between the voltage commands for the plurality of winding groups is performed for the carrier synchronized with the voltage command for the specific winding group of the multiplex-winding electric motor.

3. The power converter control device according to claim 1 , wherein
in the first synchronous PWM control mode, phase correction according to an electric phase difference between the winding groups of the multiplex-winding electric motor is performed for the carrier synchronized with the voltage command for the specific winding group of the multiplex-winding electric motor.

4. The power converter control device according to claim 1 , wherein
in the second synchronous PWM control mode, phase correction according to a phase difference between the voltage commands for the plurality of winding groups is performed for each of the carriers synchronized with the voltage commands for the respective winding groups of the multiplex-winding electric motor.

5. The power converter control device according to claim 1 , wherein
the PWM controller selects the asynchronous PWM control mode in a region in which a frequency of the voltage commands for the plurality of winding groups of the multiplex-winding electric motor is lower than a predetermined frequency, and selects the first synchronous PWM control mode or the second synchronous PWM control mode in a region in which the frequency of the voltage commands for the plurality of winding groups is higher than the predetermined frequency.

6. The power converter control device according to claim 1 , wherein
the PWM controller selects the asynchronous PWM control mode in a region in which a rotation speed of the multiplex-winding electric motor is lower than a predetermined speed, and selects the first synchronous PWM control mode or the second synchronous PWM control mode in a region in which the rotation speed is higher than the predetermined speed.

7. The power converter control device according to claim 1 , wherein
the PWM controller selects the asynchronous PWM control mode in a region in which a modulation factor of the voltage commands for the plurality of winding groups of the multiplex-winding electric motor is lower than a predetermined value, and selects the first synchronous PWM control mode or the second synchronous PWM control mode in a region in which the modulation factor of the voltage commands for the plurality of winding groups is higher than the predetermined value.

8. The power converter control device according to claim 1 , wherein
the PWM controller includes:
a carrier generator configured to output the carrier for performing the PWM control; and
a switching pulse generator configured to generate a switching pulse for driving a switching element of the power converter, using the carrier, and
the carrier generator outputs the carrier in accordance with each control mode based on the operation state of the multiplex-winding electric motor.

9. The power converter control device according to claim 1 , wherein
in the asynchronous PWM control mode, the PWM control of the voltage commands for the respective winding groups of the multiplex-winding electric motor is respectively performed using a plurality of the carriers having a certain phase difference.

10. The power converter control device according to claim 2 , wherein
the PWM controller selects the asynchronous PWM control mode in a region in which a frequency of the voltage commands for the plurality of winding groups of the multiplex-winding electric motor is lower than a predetermined frequency, and selects the first synchronous PWM control mode or the second synchronous PWM control mode in a region in which the frequency of the voltage commands for the plurality of winding groups is higher than the predetermined frequency.

11. The power converter control device according to claim 3 , wherein
the PWM controller selects the asynchronous PWM control mode in a region in which a frequency of the voltage commands for the plurality of winding groups of the multiplex-winding electric motor is lower than a predetermined frequency, and selects the first synchronous PWM control mode or the second synchronous PWM control mode in a region in which the frequency of the voltage commands for the plurality of winding groups is higher than the predetermined frequency.

12. The power converter control device according to claim 4 , wherein
the PWM controller selects the asynchronous PWM control mode in a region in which a frequency of the voltage commands for the plurality of winding groups of the multiplex-winding electric motor is lower than a predetermined frequency, and selects the first synchronous PWM control mode or the second synchronous PWM control mode in a region in which the frequency of the voltage commands for the plurality of winding groups is higher than the predetermined frequency.

13. The power converter control device according to claim 2 , wherein
the PWM controller selects the asynchronous PWM control mode in a region in which a rotation speed of the multiplex-winding electric motor is lower than a predetermined speed, and selects the first synchronous PWM control mode or the second synchronous PWM control mode in a region in which the rotation speed is higher than the predetermined speed.

14. The power converter control device according to claim 3 , wherein
the PWM controller selects the asynchronous PWM control mode in a region in which a rotation speed of the multiplex-winding electric motor is lower than a predetermined speed, and selects the first synchronous PWM control mode or the second synchronous PWM control mode in a region in which the rotation speed is higher than the predetermined speed.

15. The power converter control device according to claim 4 , wherein
the PWM controller selects the asynchronous PWM control mode in a region in which a rotation

Assignees

• Mitsubishi Electric Corp

Inventors

• Ishizuka Mitsuru

Classifications

• H02P27/08 Primary

  with pulse width modulation · CPC title

• H02P25/22

  Multiple windings; Windings for more than three phases · CPC title

• Y02B70/10

  Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes · CPC title

• H02P2209/09

  PWM with fixed limited number of pulses per period · CPC title

• H02M1/0012

  Control circuits using digital or numerical techniques (in DC/DC converters H02M3/157, H02M3/33515; in DC-AC converters H02M7/53873) · CPC title