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EP-4738693-A1 - CONTROL DEVICE FOR POWER CONVERTER, AND PROGRAM

EP4738693A1EP 4738693 A1EP4738693 A1EP 4738693A1EP-4738693-A1

Abstract

A control device (60) is applicable to a system including: a rotary electric machine (20) having armature windings (24U, 24V, 24W) and a field winding (22), a storage unit (10) that stores the driving power for the rotary electric machine, a first power converter (31) electrically connected to the armature windings and which controls the current flowing through the armature windings, and a second power converter (33) electrically connected to the field winding and controls the current flowing through the field winding. The control device includes a first control unit that performs switching control of the first power converter in a state in which an AC power supply (41) is electrically connected to the storage unit via the armature windings and the first power converter so that a current flows from the AC power supply to the power storage unit, and a second control unit that performs switching control of the second power converter so that torque of the rotary electric machine generated during switching control of the first power converter is reduced compared to when no current flows through the field winding.

Inventors

  • HASHIZUME, Ryoya
  • TOYAMA, KEISUKE

Assignees

  • DENSO CORPORATION

Dates

Publication Date
20260506
Application Date
20240527

Claims (10)

  1. A control device for a power converter (60) applicable to a system, the system comprising: a rotary electric machine (20) having armature windings (24U, 24V, 24W) and a field winding (22), a storage unit (10) that stores the drive power of the rotary electric machine, a first power converter (31) electrically connected to the armature windings and which controls the current flowing through the armature windings, a second power converter (33) electrically connected to the field winding and controls the current flowing through the field winding, a first control unit that performs switching control of the first power converter in a state in which an AC power supply (41) is electrically connected to the storage unit via the armature windings and the first power converter so that a current flows from the AC power supply to the power storage unit, and a second control unit that performs switching control of the second power converter so that torque of the rotary electric machine generated during switching control of the first power converter is reduced compared to when no current flows through the field winding.
  2. The control device for the power converter according to claim 1, wherein the rotary electric machine has a characteristic that a d-axis inductance is larger than a q-axis inductance, and the second control unit performs switching control of the second power converter so that a current flowing through the field winding is in reverse phase with a d-axis component of the current flowing through the armature windings.
  3. The control device for the power converter according to claim 1, wherein the rotary electric machine has a characteristic that a q-axis inductance is larger than a d-axis inductance, and the second control unit performs switching control of the second power converter so that a current flowing through the field winding is in phase with a d-axis component of the current flowing through the armature windings.
  4. The control device for the power converter according to any one of claims 1 to 3, wherein the first control unit performs switching control of the first power converter so that a phase of the current flowing through the armature windings is aligned with a phase of an input voltage supplied from the AC power supply to the armature windings.
  5. The control device for the power converter according to claim 4, wherein the first control unit includes: a coordinate conversion unit that converts the current flowing through the armature windings into a current in a dq coordinate system based on phase information of the input voltage, in the dq coordinate system, a command current setting unit that sets a command current of the armature windings so that the direction of the current flowing through the armature windings aligns with the direction of a voltage vector determined from the input voltage, and an armature current control unit that performs switching control of the first power converter to control the current flowing through the armature windings to the command current.
  6. The control device for the power converter according to any one of claims 1 to 3, wherein the system includes at least one pair of gears (13, 14) that constitute a power transmission mechanism (11) from a rotor (21) of the rotary electric machine to a rotating drive target (12), rotate by rotational power from the rotor, and mesh with each other, and the second control unit performs switching control of the second power converter so that the torque of the rotary electric machine generated during switching control of the first power converter is reduced compared to when no current flows through the field winding, and so that a time-averaged value of the torque of the rotary electric machine over one or more cycles of the alternating current flowing through the armature windings is offset from zero.
  7. The control device for the power converter according to claim 6, wherein the second control unit includes: a target current setting unit that sets a field target current, and a field current control unit that controls a field current flowing through the field winding to the field target current, wherein the target current setting unit shifts a phase of the field target current relative to the field current, which is either out of phase or in phase with the d-axis component of the current flowing through the armature windings, thereby offsetting the time-averaged value from zero.
  8. The control device for the power converter according to any one of claims 1 to 3, wherein the armature windings are multi-phase windings having first ends connected to the first power converter and second ends connected to each other at a neutral point, and a neutral point switch (44a, 44b) is provided on the neutral point side of each of the armature windings, electrically connecting or disconnecting between each of the armature windings.
  9. The control device for the power converter according to any one of claims 1 to 3, wherein a selector switch (42, 45) is provided between the armature windings and the AC power supply, which switches the conduction and interruption of the current flowing through the armature windings.
  10. A program applicable to a system, the system comprising: a rotary electric machine (20) having armature windings (24U, 24V, 24W) and a field winding (22), a storage unit (10) that stores the drive power of the rotary electric machine, a first power converter (31) electrically connected to the armature windings and which controls the current flowing through the armature windings, a second power converter (33) electrically connected to the field windings and controls the current flowing through the field winding, and a computer (60a), wherein the program causes the computer to perform the following: a first control process that performs switching control of the first power converter in a state in which an AC power supply (41) is electrically connected to the storage unit via the armature windings and the first power converter so that a current flows from the AC power supply to the power storage unit, and a second control process that performs switching control of the second power converter so that torque of the rotary electric machine generated during switching control of the first power converter is reduced compared to when no current flows through the field winding.

Description

[Cross-Reference to Related Applications] The present application is based on and claims the benefit of priority from earlier Japanese Patent Application No. 2023-105070 on June 27, 2023, contents of which are incorporated herein by reference. [Technical Field] The present disclosure relates to a control device for a power converter and a program. [Background Art] A system is known that includes a storage unit, a power converter electrically connected to the storage unit, and a rotary electric machine having armature windings and a field winding electrically connected to the power converter. In this system, an AC power supply is electrically connected to the storage unit via the armature windings and the power converter, thereby charging the storage unit. Then, during charging of the storage unit via the AC power supply, the current flowing through the field winding is interrupted to reduce the torque of the rotary electric machine. An example of such a technique is disclosed in Patent Literature 1. [Citation List] [Patent Literature] [PTL 1] WO 2010/012924 [Summary of the Invention] Even when charging the storage unit via the AC power supply while interrupting the field winding current, torque may still be generated in the rotary electric machine due to current flowing through the armature windings. Various problems may arise due to the torque generated by the rotary electric machine during charging of the storage unit. The primary purpose of the present disclosure is to provide a control device for a power converter and a program capable of suppressing torque in a rotary electric machine from being generated during charging of a storage unit, thereby preventing various problems. The present disclosure is: A control device for a power converter applicable to a system, the system including: a rotary electric machine having armature windings and a field winding,a storage unit that stores the drive power of the rotary electric machine,a first power converter electrically connected to the armature windings and which controls the current flowing through the armature windings,a second power converter electrically connected to the field winding and controls the current flowing through the field winding,a first control unit that performs switching control of the first power converter in a state in which an AC power supply is electrically connected to the storage unit via the armature windings and the first power converter so that a current flows from the AC power supply to the power storage unit, anda second control unit that performs switching control of the second power converter so that torque of the rotary electric machine generated during switching control of the first power converter is reduced compared to when no current flows through the field winding. When the storage unit is electrically connected to the AC power supply via the armature windings and the first power converter, switching control of the first power converter is performed to enable current to flow from the AC power supply to the storage unit. This charges the storage unit. In this case, current flowing through the armature windings generates reluctance torque, which can cause various problems. In this regard, in a configuration where the rotary electric machine includes the field winding, it is possible to control a magnet torque generated by passing current through the field winding and exciting the field winding. The energization of the field winding can be controlled by performing switching control of the second power converter. Therefore, in the present disclosure, switching control of the second power converter is performed so that the generated torque of the rotary electric machine during switching control of the first power converter is reduced compared to when no current flows through the field winding. This reduces the total torque from the magnetizing torque and the reluctance torque compared to when no current flows through the field winding. Therefore, it is possible to suppress torque from being generated by the rotary electric machine during charging of the storage unit. As a result, it is possible to suppress problems caused by the torque generated by the rotary electric machine from occurring during charging of the storage unit. [Brief Description of the Drawings] The above features of the present disclosure will be made clearer by the following detailed description, given referring to the appended drawings. In the accompanying drawings: Fig. 1 shows an overall configuration diagram of an in-vehicle system according to a first embodiment;Fig. 2 shows a schematic diagram of a first coordinate conversion unit;Fig. 3 shows a schematic diagram of a second coordinate conversion unit;Fig. 4 shows a functional block diagram of a three-phase charging control performed by a control device;Fig. 5 shows timing charts illustrating an example of three-phase charging control;Fig. 6 shows an example of the three-phase charging control;Fig.