Control device and program for power converter

Abstract

A control device (60) is applied to a system provided with: a power storage unit (10, 100, 200); a plurality of power converters (20, 40, 70, 80, 110, 210); a rotating electrical machine (30, 90, 120, 220) having windings electrically connected to the respective power converters; and a heat transfer unit (400, 401) that transfers heat generated in at least one of the respective power converters to an object to be heated (10, 100, 200). A control device is provided with: a determination unit that determines whether or not there is a temperature rise request for a temperature rise object; and a control unit that, when it is determined that there is a temperature rise request, performs switching control of each of the power converters so that alternating d-axis and q-axis currents flow to the windings (32, 34U-34W, 93A, 93B, 123U-123W, 223U-223W) while maintaining the rotation stop state of the rotors (31, 91, 121, 221) of the rotating electrical machine.

Description

[0001] Cross-references of related applications

[0002] This application is based on Japanese application No. 2022-109667 filed on July 7, 2022, and the contents thereof are cited herein. Technical Field

[0003] The present disclosure relates to a control device and a program for a power converter. Background Art

[0004] In the past, a control device for a vehicle as described in Patent Document 1 is known, the vehicle having a battery, an inverter electrically connected to the battery, and a rotating electric machine having an armature winding electrically connected to the inverter. The control device sets the q-axis current flowing to the armature winding to zero and flows the d-axis current to the armature winding by performing switching control of the inverter while the vehicle is stopped. Thus, the battery is heated while the rotation of the rotor of the rotating electric machine is maintained in a stopped state. As a result, the battery can be preheated while the vehicle is maintained in a stopped state.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 5259752 Summary of the invention

[0008] In order to quickly raise the temperature of a temperature-raising object such as a battery, it is conceivable to flow a q-axis current in addition to the d-axis current. However, in this case, torque is generated in the rotating electrical machine, and there is a concern that the rotor cannot be maintained in a rotationally stopped state.

[0009] A main object of the present disclosure is to provide a control device and a program for a power converter capable of rapidly raising the temperature of a temperature-raising target while maintaining a rotation-stopped state of a rotor of a rotating electric machine.

[0010] The present invention discloses a control device for a power converter, which is applied to a system. The system comprises:

[0011] Power storage unit;

[0012] a plurality of power converters electrically connected to the power storage unit;

[0013] a rotating electrical machine having a winding electrically connected to each of the power converters; and

[0014] a heat transfer unit that transfers heat generated in at least one of the power converters to a temperature-increasing object,

[0015] The control device of the power converter comprises:

[0016] a determination unit configured to determine whether there is a temperature increase request for the temperature increase object; and

[0017] The control unit controls switching of each of the power converters so that an alternating d-axis current and a q-axis current flow through the winding while maintaining the rotation stop state of the rotor of the rotating electrical machine when the determination unit determines that there is a temperature increase request.

[0018] According to the present disclosure, the q-axis current flows in addition to the d-axis current, thereby increasing the amount of heat generated by the switch control. Therefore, the temperature of the temperature-increasing object can be rapidly increased by transferring the heat generated by the switch control to the temperature-increasing object via the heat transfer unit. At this time, the rotation stop state of the rotor can be maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above-mentioned object and other objects, features and advantages of the present disclosure will become more apparent through the following detailed description with reference to the accompanying drawings.

[0020] Figure 1 is an overall structural diagram of the vehicle-mounted system involved in the first embodiment,

[0021] Figure 2 is a diagram showing an overview of a cooling system as a heat transfer unit,

[0022] Figure 3 This is a diagram showing the changes in the three-phase AC current, d-axis and q-axis currents, excitation current, and torque during temperature rise control.

[0023] Figure 4 is a diagram showing the current vector during temperature rise control in the dq coordinate system.

[0024] Figure 5 1 is a diagram showing changes in three-phase AC current, d-axis current, q-axis current, exciting current, and torque in temperature rise control according to a comparative example.

[0025] Figure 6 is a flow chart showing the processing procedure of temperature rise control.

[0026] Figure 7 is a diagram showing a current vector during temperature increase control in a dq coordinate system according to a modification of the first embodiment.

[0027] Figure 8 is a diagram showing a current vector during temperature increase control in a dq coordinate system according to a modification of the first embodiment.

[0028] Fig. 9 is a diagram showing a current vector during temperature increase control in a dq coordinate system according to a modification of the first embodiment.

[0029] Fig.10 is a diagram showing a current vector during temperature increase control in a dq coordinate system according to a modification of the first embodiment.

[0030] Fig.11 is a diagram showing a current flowing during temperature increase control according to a modification of the first embodiment.

[0031] Fig.12 FIG. 1 is a diagram showing a change in current during temperature increase control according to the second embodiment.

[0032] Fig.13 : is a diagram showing the change of the current during the temperature increase control according to the third embodiment.

[0033] Fig.14 is an overall structural diagram of a vehicle-mounted system according to a fourth embodiment.

[0034] Fig.15 is a diagram showing the current vector during temperature rise control in the dq coordinate system.

[0035] Fig.16 is a diagram showing a current vector during temperature increase control in a dq coordinate system according to a modification of the fourth embodiment.

[0036] Fig.17 It is an overall configuration diagram of the vehicle-mounted system involved in the fifth embodiment. DETAILED DESCRIPTION

[0037] <First Embodiment>

[0038] Hereinafter, a first embodiment in which the control device according to the present disclosure is embodied will be described with reference to the drawings. A system including the control device of the present embodiment is mounted on a vehicle such as an electric vehicle or a hybrid vehicle.

[0039] like Figure 1 As shown, the system includes a battery 10 (equivalent to a "power storage unit"), two power converters, and a rotating electric machine 30. In the present embodiment, the rotating electric machine 30 is a winding excitation type rotating electric machine. In addition, the rotating electric machine 30 has a characteristic that the q-axis inductance Lq is greater than the d-axis inductance Ld, that is, reverse salient polarity.

[0040] The battery 10 is a battery pack composed of battery cells connected in series. The battery cells are, for example, secondary batteries such as lithium-ion batteries. The battery 10 can be charged by an external charger provided outside the vehicle. The external charger is, for example, a stationary charger.

[0041] The rotating electric machine 30 includes a rotor 31. The rotor 31 includes an excitation winding 32. The rotating shaft of the rotor 31 can transmit power to the drive wheel 12 of the vehicle via the power transmission mechanism 11 of the vehicle. The torque generated by the rotating electric machine 30 functioning as an electric motor is transmitted to the drive wheel 12 via the power transmission mechanism 11, so that the drive wheel 12 rotates. In addition, the power transmission mechanism 11 includes, for example, a speed change device and a shaft. In addition, the rotating electric machine 30 can be, for example, an in-wheel motor that is integrally provided with the drive wheel 12 of the vehicle, or an on-board motor that is arranged on the body of the vehicle.

[0042] The rotating electric machine 30 includes a stator 33. The stator 33 includes U-, V-, and W-phase windings 34U, 34V, and 34W as armature windings which are star-connected in a state where the electrical angle is shifted by 120 degrees from each other.

[0043] The system includes an inverter 20 (equivalent to a "first inverter") and an excitation energizing circuit 40 (equivalent to a "second inverter") as a power converter. The inverter 20 converts the DC current from the battery 10 into an AC current and supplies it to the armature winding. The inverter 20 includes a series connection of U, V, and W phase upper arm switches SUH, SVH, and SWH and U, V, and W phase lower arm switches SUL, SVL, and SWL. In the present embodiment, each switch SUH, SVH, SWH, SUL, SVL, and SWL is an N-channel MOSFET. Each switch SUH, SVH, SWH, SUL, SVL, and SWL includes a body diode DUH, DVH, DWH, DUL, DVL, and DWL.

[0044] The drain of the high potential side terminal of the U, V, W phase upper arm switches SUH, SVH, SWH is connected to the positive terminal of the battery 10 via the high potential side electrical path Lp. The source of the low potential side terminal of the U, V, W phase lower arm switches SUL, SVL, SWL is connected to the negative terminal of the battery 10 via the low potential side electrical path Ln. Each electrical path Lp, Ln is a conductive member such as a bus bar. The inverter 20 has a first capacitor 21 as a smoothing capacitor. In addition, the first capacitor 21 can also be provided outside the inverter 20.

[0045] The excitation current supply circuit 40 is used to supply current from the battery 10 to the excitation winding 32. The excitation current supply circuit 40 of the present embodiment is a full-bridge circuit, and includes a series connection of a first upper arm switch SH1 and a first lower arm switch SL1, and a series connection of a second upper arm switch SH2 and a second lower arm switch SL2. In the present embodiment, each switch SH1, SH2, SL1, SL2 is an N-channel MOSFET. Each switch SH1, SH2, SL1, SL2 includes a body diode DH1, DH2, DL1, DL2. Each switch SH1, SH2, SL1, SL2 is a bidirectional conductive switch element that allows current to flow from the drain to the source and current to flow from the source to the drain when turned on.

[0046] The positive terminal of the battery 10 is connected to the drains of the high potential terminals of the first and second upper arm switches SH1 and SH2 via the high potential side electrical path Lp. The negative terminal of the battery 10 is connected to the sources of the low potential terminals of the first and second lower arm switches SL1 and SL2 via the low potential side electrical path Ln. The first end of the field winding 32 is connected to the connection point of the first upper arm switch SH1 and the first lower arm switch SL1 via a brush not shown. The second end of the field winding 32 is connected to the connection point of the second upper arm switch SH2 and the second lower arm switch SL2 via a brush not shown. The field energizing circuit 40 includes a second capacitor 41 as a smoothing capacitor. In addition, the second capacitor 41 may be provided outside the field energizing circuit 40. In addition, instead of providing the second capacitor 41 individually to the field energizing circuit 40 and providing the first capacitor 21 individually to the inverter 20, a common capacitor may be provided to the inverter 20 and the field energizing circuit 40. In this case, for example, a configuration may be adopted in which the second capacitor 41 is not provided.

[0047] like Figure 2 As shown, the system includes a device for cooling the inverter 20, the field current circuit 40, the rotary electric machine 30, and the battery 10 when the inverter 20 is switched on and off for driving the vehicle. Specifically, the vehicle includes a circulation path 400 for circulating cooling water, an electric water pump 401, a radiator 402, and an electric fan 403. The water pump 401 is driven by power to circulate cooling water. Figure 2 In the example shown, in the circulation path 400, the inverter 20, the field energizing circuit 40, the rotating electrical machine 30, and the battery 10 are sequentially arranged on the downstream side of the water pump 401. The arrangement order in the circulation path 400 is not limited to Figure 2 in the order shown.

[0048] A radiator 402 is provided between the water pump 401 and the battery 10 in the circulation path 400. The radiator 402 cools the cooling water flowing in through the circulation path 400 and supplies the cooling water to the water pump 401. The cooling water flowing in the radiator 402 is cooled by the running wind blowing on the radiator 402 as the vehicle travels and by the wind blowing on the radiator 402 by rotating the fan 403.

[0049] The water pump 401 and the fan 403 may be driven by a control device different from the control device 60. However, in the present embodiment, for convenience, the water pump 401 and the fan 403 are driven by the control device 60 included in the system.

[0050] Return to Figure 1 As described above, the system includes a voltage sensor 50, a phase current sensor 51, an excitation current sensor 52, an angle sensor 53, and a temperature sensor 54. The voltage sensor 50 detects the voltage of the battery 10. The phase current sensor 51 detects the phase current flowing through at least two phases of the U, V, and W phase windings 34U, 34V, and 34W. The excitation current sensor 52 detects the excitation current flowing through the excitation winding 32. The angle sensor 53 detects the rotation angle (electrical angle) of the rotor 31. The temperature sensor 54 detects the temperature of the battery 10. The detection values ​​of each sensor 50 to 54 are input to the control device 60.

[0051] The control device 60 is mainly composed of a microcomputer 61, and the microcomputer 61 has a CPU. The functions provided by the microcomputer 61 can be provided by software recorded in a physical memory device and a computer that executes the software, only by software, only by hardware, or a combination thereof. For example, in the case where the microcomputer 61 is provided by an electronic circuit as hardware, the microcomputer 61 can be provided by a digital circuit including a plurality of logic circuits, or an analog circuit. For example, the microcomputer 61 executes a program stored in a non-transitory tangible storage medium as a storage unit provided by the microcomputer 61. The program includes, for example, the following Figure 6 By executing the program, the method corresponding to the program is executed. The storage unit is, for example, a nonvolatile memory. In addition, the program stored in the storage unit can be updated via, for example, OTA (Over The Air) or a communication network such as the Internet.

[0052] The control device 60 performs switch control of each switch constituting the excitation current circuit 40 in order to excite the excitation winding 32. In detail, the control device 60 performs switch control in such a manner that a first state and a second state appear alternately in order to control the excitation current If detected by the excitation current sensor 52 to a target excitation current Iftgt. The first state is a state in which the first upper arm switch SH1 and the second lower arm switch SL2 are turned on, and the second upper arm switch SH2 and the first lower arm switch SL1 are turned off. The second state is a state in which the first upper arm switch SH1 and the second lower arm switch SL2 are turned off, and the second upper arm switch SH2 and the first lower arm switch SL1 are turned on.

[0053] The control device 60 performs switch control of each switch constituting the inverter 20 in order to feedback control the control amount of the rotating electric machine 30 to the command value based on the detection values ​​of each sensor 50 to 54 when the field winding 32 is excited. In the present embodiment, the control amount is torque. In each phase, the upper arm switch and the lower arm switch are alternately turned on. Through this feedback control, the rotational power of the rotor 31 is transmitted to the drive wheel 12, so that the vehicle travels.

[0054] Next, the temperature increase control of the battery 10 performed by the control device 60 is described. This control is a control to generate heat by controlling the switching of the inverter 20 and the excitation energization circuit 40 when the temperature of the battery 10 detected by the temperature sensor 54 is lower than the target temperature Ttgt when the battery 10 is charged by the external charger during the parking of the vehicle. The generated heat is transferred to the battery 10 via the cooling water circulating in the circulation path 400 driven by the water pump 401. The temperature increase control continues, for example, until the temperature of the battery 10 reaches the target temperature Ttgt. In addition, the driving of the water pump 401 continues at least during the execution of the temperature increase control. In addition, in the present embodiment, the circulation path 400, the cooling water circulating in the circulation path 400, and the water pump 401 are equivalent to the "heat transfer unit". Through the temperature increase control, the battery 10 is quickly heated up, and the charging time of the battery 10 by the external charger is shortened.

[0055] In order to improve the temperature raising capability based on the temperature raising control, the control device 60 performs switching control of the inverter 20 in a manner that d and q axis currents flow through the armature windings during the temperature raising control. At this time, in order to maintain the vehicle's parking state by maintaining the rotation stop state of the rotor 31, the control device 60 performs switching control of the excitation energizing circuit 40 in a manner that reduces the magnetic resistance torque generated by the flow of the d and q axis currents by the electromagnetic torque. The temperature raising control will be described in detail below.

[0056] The torque Trq generated by the rotating electric machine 30 is composed of the electromagnetic torque TM and the reluctance torque TR as expressed by the following equation (eq1). In the following equation (eq1), P represents the number of pole pairs of the rotating electric machine 30, It represents the magnetic flux generated by the excitation current flowing through the excitation winding.

[0057]

[0058] The control device 60 supplies the following to each phase winding 34U-34W during the temperature rise control: Figure 3 The switching control of the inverter 20 is performed by using three-phase sinusoidal AC currents IU, IV, and IW with phases shifted by 120 degrees in electrical angle as shown in (A). In this case, Figure 3 As shown in (B), sinusoidal d-axis and q-axis currents Id and Iq flow. In this case, the frequencies of the d-axis and q-axis currents Id and Iq are the same, and the phase difference between the d-axis current Id and the q-axis current Iq is 90 degrees in electrical angle.

[0059] On the other hand, the magnetic flux As expressed by the following equation (eq2), it is proportional to the multiplication value of the number of turns Nf of the field winding 32 and the field current If.

[0060]

[0061] The condition that the electromagnetic torque TM cancels the reluctance torque TR is imposed on the above equation (eq1). Specifically, Trq=0 is assumed in the above equation (eq1). In this case, the following equation (eq3) is derived.

[0062]

[0063] The following formula (eq4) is derived from the above formulas (eq2) and (eq3).

[0064] If∝-(Lq-Ld)·Id / Nf…(eq4)

[0065] In this embodiment, Lq>Ld in (eq4). Therefore, Figure 3 As shown in (C), the control device 60 sets a sinusoidal target excitation current Iftgt that is 180 degrees out of phase with the d-axis current Id and has the same frequency as the d-axis current Id. The control device 60 performs switching control of the excitation current circuit 40 so that the excitation current If detected by the excitation current sensor 52 becomes the target excitation current Iftgt. Figure 3As shown in (D), the difference between the magnetic resistance torque TR and the electromagnetic torque TM can be made smaller than the torque threshold Trqth. The torque threshold Trqth is the torque at which the drive wheel 12 starts to rotate, and is set to, for example, the upper limit of the range of torques assumed to be the start of rotation of the drive wheel 12. According to the above-mentioned temperature increase control, the rotation stop state of the rotor 31 can be maintained, and the occurrence of situations that cause discomfort to the user of the vehicle can be suppressed. In addition, Figure 3 Tf shown is one cycle of the d-axis current Id and the field current If.

[0066] In the temperature increase control of the present embodiment, the switching control of the upper and lower arm switches of the three phases is performed. Therefore, the heat generated in the inverter 20 as the temperature increase control is executed can be dispersed to each phase and each arm.

[0067] Figure 4 is a diagram showing the current flowing during the temperature rise control in the dq coordinate system. Figure 4 In the figure, Ivt_3ph represents the current vector flowing through the armature winding in the dq coordinate system (hereinafter, the armature current vector), and Ivt_fld represents the current vector flowing through the field winding 32 in the dq coordinate system (hereinafter, the field current vector). Since the rotation of the rotor 31 is stopped, the armature current vector Ivt_3ph rotates at the frequency of the three-phase AC current. The control device 60 performs switching control of the inverter 20 and the field energizing circuit 40 in such a manner that the phase difference between the rotating armature current vector Ivt and the field current vector Ivt_fld is 180 degrees. As a result, the field current vector Ivt_fld has a component that reduces the reluctance torque of the rotating electrical machine 30, and more specifically, has a component that makes the reluctance torque close to 0.

[0068] In contrast, Figure 5 In the comparative example shown, the field current If is maintained at 0 during the temperature rise control. As a result, the generated torque Trq of the rotating electrical machine greatly pulsates, causing the generated torque to exceed the torque threshold Trqth. Incidentally, even in the case where the field current If is maintained at a constant value other than 0 during the temperature rise control, the generated torque Trq of the rotating electrical machine greatly pulsates, causing the generated torque to exceed the torque threshold Trqth.

[0069] Figure 6 2 is a flowchart showing a processing procedure of temperature increase control executed by control device 60. This processing is executed when control device 60 determines that charging of battery 10 by an external charger has started, for example.

[0070] In step S10, it is determined whether there is a request to increase the temperature of battery 10. In the present embodiment, it is determined that there is a request to increase the temperature when the detected temperature of battery 10 is lower than target temperature Ttgt. In the present embodiment, the process of step S10 corresponds to a "determining unit".

[0071] When it is determined in step S10 that there is a temperature increase request, the process proceeds to step S11, and switching control of the inverter 20 and the field energizing circuit 40 is performed in order to perform the above-mentioned temperature increase control.

[0072] In step S12 , it is determined whether the temperature Tobj of the temperature increase target reaches the target temperature Ttgt. In the present embodiment, as described above, since the temperature increase target is the battery 10 , the temperature Tobj of the temperature increase target is the temperature of the battery 10 .

[0073] If it is determined in step S12 that the temperature of the battery 10 is lower than the target temperature Ttgt, the switch control of step S11 is continued. On the other hand, if it is determined that the temperature of the battery 10 has reached the target temperature Ttgt, the temperature increase control is stopped. In addition, in this embodiment, the processing of steps S11 and S12 corresponds to the "control unit".

[0074] Incidentally, during the execution of the temperature increase control, the rotation drive of the fan 403 may be stopped in order to suppress a decrease in the temperature of the cooling water in the circulation path 400 .

[0075] According to the present embodiment described in detail above, the heat generated in the inverter 20, the field energization circuit 40, and the rotating electric machine 30 (e.g., the armature winding) can be increased. The generated heat is transferred to the battery 10 via the circulation path 400. As a result, the battery 10 can be quickly heated up, and the charging time of the battery 10 by external charging can be shortened. At this time, the rotation stop state of the rotor 31 can be maintained, so that discomfort to the user of the vehicle during external charging can be prevented.

[0076] <Modification of First Embodiment>

[0077] The phase difference α between the armature current vector Ivt_3ph and the field current vector Ivt_fld during the temperature rise control period is not limited to 180 degrees, and may be any other than 180 degrees, as long as the field current vector Ivt_fld has a component that reduces the reluctance torque. Figure 7 Angle shown. Figure 7The phase difference α shown is positive when the field current vector Ivt_fld leads the armature current vector Ivt_3ph in the clockwise direction. The phase difference α is set to 90 degrees < α < 270 degrees, for example, on the condition that the torque Trq generated by the rotary electric machine 30 is less than the torque threshold Trqth, and is preferably set to 150 degrees ≤ α ≤ 210 degrees, and more preferably 170 degrees ≤ α ≤ 190 degrees.

[0078] The rotating electrical machine 30 may also have a characteristic that the d-axis inductance Ld is greater than the q-axis inductance Lq, that is, positive saliency. In this case, based on the above formula (eq4), Figure 8 As shown, in the temperature rise control, the inverter 20 and the field energizing circuit 40 may be operated so that the phase difference α between the field current vector Ivt_fld and the armature current vector Ivt_3ph becomes 0 degrees.

[0079] In addition, the phase difference α in the case of positive saliency is not limited to 0 degrees, and may be any value as long as the exciting current vector Ivt_fld has a component that reduces the magnetic resistance torque. Fig. 9 and Fig.10 The phase difference α is set to -90 degrees < α < 90 degrees, preferably -30 degrees ≤ α ≤ 30 degrees, and more preferably -10 degrees ≤ α ≤ 10 degrees, under the condition that the torque Trq generated by the rotary electric machine 30 is less than the torque threshold Trqth. Fig. 9 and Fig.10 2 shows the case where the phase difference α is negative.

[0080] The current flowing through each phase winding 34U to 34W and the field winding 32 during the temperature rise control is not limited to a sinusoidal current, and may be a current of Fig.11 The sinusoidal current including the high-order harmonic components as shown in (A) and (B) may also be as shown in Fig.11 Rectangular wave current as shown in (C) and (D).

[0081] The control device 60 can make the torque threshold value Trqth variable. For example, when the parking brake of the vehicle is in an actuated state, the torque threshold value Trqth is set larger than when it is not in an actuated state.

[0082] The control device 60 may include an acquisition unit that acquires the temperature of the road surface on which the vehicle is traveling, and may change the torque threshold value Trqth based on the acquired road surface temperature. Here, map information that associates the road surface temperature with the torque threshold value Trqth may be used.

[0083] The control device 60 may apply a braking torque to the wheels of the vehicle using a mechanical brake device provided in the vehicle during the execution of the temperature increase control.

[0084] <Second Embodiment>

[0085] The second embodiment will be described below with reference to the drawings, centering on the differences from the first embodiment. In this embodiment, the control device 60 performs switching control of the inverter 20 and the field current circuit 40 in such a manner that the amplitudes of the d-axis current and the field current gradually increase during the execution of the temperature rise control.

[0086] Fig.12 An example of temperature rise control of the present embodiment is shown in FIG. 1 . At time t1, the control device 60 determines that there is a temperature rise request. As a result, the control device 60 starts switching control of the inverter 20 and the field current circuit 40 in order to start flowing the d-axis current Id, Iq to the armature winding and to start flowing the field current If to the field winding 32. Afterwards, the control device 60 performs switching control of the inverter 20 and the field current circuit 40 in such a way that the amplitudes of the d-axis current Id, Iq and the field current If gradually increase.

[0087] According to the present embodiment described above, it is possible to suppress the vibration of the shaft included in the power transmission mechanism 11 when the temperature increase control is started.

[0088] Furthermore, when the amplitude reaches the maximum value before the temperature of the battery 10 reaches the target temperature Ttgt, the control device 60 may stop the gradual increase of the amplitude and fix the amplitude at the maximum value.

[0089] <Third Embodiment>

[0090] The third embodiment will be described below with reference to the drawings, centering on the differences from the first embodiment. In this embodiment, the control device 60 performs switching control of the inverter 20 and the field current circuit 40 in such a manner that the frequencies of the d-axis current and the field current gradually increase during the execution of the temperature rise control.

[0091] Fig.13 An example of temperature rise control of the present embodiment is shown in FIG. At time t1, the control device 60 determines that there is a temperature rise request. As a result, the control device 60 starts switching control of the inverter 20 and the field power circuit 40 in order to start flowing the d-axis current Id, Iq to the armature winding and to start flowing the field current If to the field winding 32. Afterwards, the control device 60 performs switching control of the inverter 20 and the field power circuit 40 in such a manner that the frequencies of the d-axis current Id, Iq and the field current If gradually increase.

[0092] According to the present embodiment described above, the same effects as those of the second embodiment can be obtained.

[0093] Furthermore, when the frequency reaches the maximum value before the temperature of the battery 10 reaches the target temperature Ttgt, the control device 60 may stop the gradual increase of the frequency and fix the frequency at the maximum value.

[0094] <Modification of the Third Embodiment>

[0095] In the temperature rise control, the amplitude may be gradually increased together with the frequency of the d-axis current Id, Iq and the exciting current If.

[0096] <Fourth Embodiment>

[0097] Hereinafter, the fourth embodiment will be described with reference to the drawings, centering on the differences from the first embodiment. Fig.14 As shown in the figure, the structure of the rotating motor and the inverter has been changed. Fig.14 For convenience, Figure 1 The same structures as shown are denoted by the same reference numerals.

[0098] The system includes a rotating electrical machine 90 having two armature winding systems. The rotating electrical machine 90 is a synchronous machine and includes a rotor 91 and a stator 92. The rotor 91 includes a permanent magnet as an excitation pole. The rotating shaft of the rotor 91 can transmit power to the drive wheels 12 via a power transmission mechanism 11 provided in the vehicle.

[0099] The stator 92 includes a first armature winding 93A and a second armature winding 93B. The first armature winding 93A includes U, V, and W phase windings UA, VA, and WA that are star-connected at an electrical angle of 120 degrees. The second armature winding 93B includes U, V, and W phase windings UB, VB, and WB that are star-connected at an electrical angle of 120 degrees. The rotor 91 is common to each armature winding 93A and 93B. In the present embodiment, the phase difference between the U phase winding UA of the first armature winding 93A and the U phase winding UB of the second armature winding 93B is set to 0.

[0100] The system includes a first inverter 70 that is individually provided corresponding to the first armature winding 93A, and a second inverter 80 that is individually provided corresponding to the second armature winding 93B.

[0101] The first inverter 70 is similar to the inverter 20 of the first embodiment and includes a series connection of U, V, W phase upper arm switches SUAH, SVAH, SWAH and U, V, W phase lower arm switches SUAL, SVAL, SWAL. Each switch SUAH, SVAH, SWAH, SUAL, SVAL, SWAL includes a body diode DUAH, DVAH, DWAH, DUAL, DVAL, DWAL.

[0102] The second inverter 80 includes a series connection of U, V, W phase upper arm switches SUBH, SVBH, SWBH and U, V, W phase lower arm switches SUBL, SVBL, SWBL, similarly to the first inverter 70. Each switch SUBH, SVBH, SWBH, SUBL, SVBL, SWBL includes a body diode DUBH, DVBH, DWBH, DUBL, DVBL, DWBL.

[0103] The drain of each upper arm switch of the first inverter 70 and the second inverter 80 is connected to the positive terminal of the battery 10 via the high potential side electrical path Lp. The source of each lower arm switch of the first inverter 70 and the second inverter 80 is connected to the negative terminal of the battery 10 via the low potential side electrical path Ln. The first inverter 70 includes a first capacitor 71 as a smoothing capacitor. The second inverter 80 includes a second capacitor 81 as a smoothing capacitor.

[0104] The system has prior Figure 2 The first inverter 70, the second inverter 80, the rotating electric machine 90, and the battery 10 are arranged in a circulation path 400 constituting the cooling device.

[0105] The system includes a voltage sensor 50, a phase current sensor 51, an angle sensor 53, and a temperature sensor 54. The phase current sensor 51 includes a first current sensor for detecting at least two phase currents flowing through the first armature winding 93A and a second current sensor for detecting at least two phase currents flowing through the second armature winding 93B.

[0106] The control device 60 performs switching control of the switches constituting the first and second inverters 70 and 80 in order to feedback-control the torque of the rotary electric machine 90 to the command torque based on the detection values ​​of the sensors 50, 51, 53, and 54. Through this feedback control, the rotational power of the rotor 91 is transmitted to the drive wheels 12, so that the vehicle travels.

[0107] The control device 60 controls the switching of the first inverter 70 to control the torque generated by energizing the first armature winding 93A to the first command torque, and controls the switching of the second inverter 80 to control the torque generated by energizing the second armature winding 93B to the second command torque. As a result, the torque generated by the rotary electric machine 90 is controlled to be the total torque of the first command torque and the second command torque. In addition, the first command torque and the second command torque are, for example, the same value.

[0108] Next, the temperature increase control of the battery 10 executed by the control device 60 will be described. In the temperature increase control of this embodiment, only the previous Figure 6 The process of step S11 in the process shown in FIG. Fig.15 The temperature increase control of this embodiment is described. Fig.15 In , Ivt_A represents a current vector flowing through the first armature winding 93A in the dq coordinate system (hereinafter, a first armature current vector), and Ivt_B represents a current vector flowing through the second armature winding 93B in the dq coordinate system (hereinafter, a second armature current vector).

[0109] The control device 60 performs switching control of the first and second inverters 70 and 80 in such a manner that the first armature current vector Ivt_A and the second armature current vector Ivt_B have the same magnitude and the phase difference between the first armature current vector Ivt_A and the second armature current vector Ivt_B is 180 degrees. Through this control, the second armature current vector Ivt_B also rotates at the same frequency as the first armature current vector Ivt_A rotating at the frequency of the three-phase AC current. As a result, the torque generated by energizing the first armature winding 93A can be reduced by the torque generated by energizing the second armature winding 93B. Specifically, the torque generated by energizing the first armature winding 93A can be made close to 0. As a result, the generated torque of the rotating electric machine 90 becomes smaller than the torque threshold Trqth.

[0110] According to the present embodiment described above, the temperature of the battery 10 can be rapidly increased while the rotation stop state of the rotor 91 is maintained.

[0111] <Variation of the Fourth Embodiment>

[0112] In the same manner as the control described in the second and third embodiments, at least one of the amplitude and frequency of the d-axis current flowing through the first armature winding 93A and the d-axis current flowing through the second armature winding 93B may be gradually increased. In this case, even if an imbalance occurs in the current flowing through the first and second armature windings 93A and 93B at the start of the temperature rise control, the influence of the imbalance can be suppressed.

[0113] On the condition that the generated torque of the rotary electric machine 90 is smaller than the torque threshold value Trqth, the magnitude of the first armature current vector Ivt_A and the magnitude of the second armature current vector Ivt_B may be different in the temperature increase control.

[0114] Regarding the phase difference β between the first armature current vector Ivt_A and the first armature current vector Ivt_B during the temperature rise control period, the second armature current vector Ivt_B only needs to have a component that is 180 degrees out of phase with the first armature current vector Ivt_A. It is not limited to 180 degrees and may also be Fig.16 Angle shown. Fig.16 The phase difference β shown is positive when the second armature current vector Ivt_B leads the first armature current vector Ivt_A in the clockwise direction. The phase difference β is set to 90 degrees < β < 270 degrees, for example, on the condition that the torque Trq generated by the rotary electric machine 90 is less than the torque threshold Trqth, and is preferably set to 150 degrees ≤ β ≤ 210 degrees, and more preferably 170 degrees ≤ β ≤ 190 degrees.

[0115] The armature windings and inverters provided in the rotating electrical machine may be M or more (M is an integer greater than or equal to 3). In this case, the control device 60 may control the switching of each inverter in such a manner that the phases of the current vectors flowing through the armature windings of each system in the dq coordinate system are shifted by "360 / M" degrees.

[0116] <Fifth Embodiment>

[0117] Hereinafter, the fifth embodiment will be described with reference to the drawings, centering on the differences from the first embodiment. Fig.17 As shown in the figure, the structure of the rotating motor and the inverter has been changed. Fig.17 For convenience, Figure 1 , Fig.14 The same structures as shown are denoted by the same reference numerals.

[0118] The system includes two sets of rotating electrical machines and inverters. The rotating power of the rotor of each rotating electrical machine is transmitted to the driving wheels 305 of the vehicle via the power transmission mechanism of the vehicle.

[0119] The system includes a first battery 100 and a second battery 200 (equivalent to a "power storage unit"), a first inverter 110 and a second inverter 210, and a first rotating electric machine 120 and a second rotating electric machine 220. In this embodiment, each rotating electric machine 120, 220 is a permanent magnet excitation type synchronous machine as in the fourth embodiment. In addition, each battery 100, 200 is a battery pack, for example, a secondary battery such as a lithium ion battery. Each battery 100, 200 can be charged by an external charger provided outside the vehicle.

[0120] The first rotating electric machine 120 includes a first rotor 121. The second rotating electric machine 220 includes a second rotor 221. The rotating shaft of the first rotor 121 and the rotating shaft of the second rotor 221 can transmit power to the driving wheel 305 via a power transmission mechanism. The power transmission mechanism includes a first drive shaft 301, a second drive shaft 302, a counter gear 303, and a shaft 304. The rotating shaft of the first rotor 121 is connected to the counter gear 303 via the first drive shaft 301, and the rotating shaft of the second rotor 221 is connected to the counter gear 303 via the second drive shaft 302. The driving wheel 305 is connected to the counter gear 303 via the shaft 304. As a result, the rotational power of each of the first rotor 121 and the second rotor 221 is summed up in the counter gear 303, and the summed rotational power is transmitted to the driving wheel 305. In addition, the first drive shaft 301, the second drive shaft 302, and the counter gear 303 correspond to the "power transmission unit".

[0121] The first rotating electrical machine 120 includes a first stator 122. The first stator 122 includes U, V, and W phase windings 123U, 123V, and 123W that are star-connected at an electrical angle of 120 degrees from each other as armature windings. The second rotating electrical machine 220 includes a second stator 222. The second stator 222 includes U, V, and W phase windings 223U, 223V, and 223W that are star-connected at an electrical angle of 120 degrees from each other as armature windings.

[0122] The U, V, and W phase windings 123U, 123V, and 123W are electrically connected to the first battery 100 via the first inverter 110. The U, V, and W phase windings 223U, 223V, and 223W are electrically connected to the second battery 200 via the second inverter 210. The first inverter 110 has the same structure as the first inverter 70 of the fourth embodiment, and the second inverter 210 has the same structure as the second inverter 80 of the fourth embodiment. The first inverter 110 includes a first capacitor 111 as a smoothing capacitor, and the second inverter 210 includes a second capacitor 211 as a smoothing capacitor.

[0123] The system has prior Figure 2The first inverter 110, the second inverter 210, the first rotating electric machine 120, the second rotating electric machine 220, the first battery 100, and the second battery 200 are arranged in a circulation path 400 constituting the cooling device.

[0124] The system includes a voltage sensor 50, a phase current sensor 51, an angle sensor 53, and a temperature sensor 54. The phase current sensor 51 includes a first current sensor for detecting at least two phases of the phase current flowing through the armature winding of the first rotating motor 120 and a second current sensor for detecting at least two phases of the phase current flowing through the armature winding of the second rotating motor 220. The angle sensor 53 includes a first angle sensor for detecting the rotation angle (electrical angle) of the first rotor 121 and a second angle sensor for detecting the rotation angle (electrical angle) of the second rotor 221. The temperature sensor 54 includes a first temperature sensor for detecting the temperature of the first battery 100 and a second temperature sensor for detecting the temperature of the second battery 200.

[0125] The control device 60 performs switch control of each switch constituting the first inverter 110 in order to feedback control the torque of the first rotating electric machine 120 to the first command torque based on the detection values ​​of each sensor 50, 51, 53, and 54. In addition, the control device 60 performs switch control of each switch constituting the second inverter 210 in order to feedback control the torque of the second rotating electric machine 220 to the second command torque based on the detection values ​​of each sensor 50, 51, 53, and 54. Through this feedback control, the total rotational power of the first rotor 121 and the second rotor 221 is transmitted to the drive wheel 305, so that the vehicle travels.

[0126] Next, the temperature increase control of the first and second storage batteries 100 and 200 executed by the control device 60 will be described. The temperature increase control of this embodiment is different from the previous Figure 6 Specifically, in step S10 , when the lower temperature of the detected temperatures of the first and second batteries 100 and 200 is lower than the target temperature Ttgt, the control device 60 determines that there is a temperature increase request.

[0127] When it is determined in step S12 that the lower temperature of the first and second batteries 100 and 200 has reached the target temperature Ttgt, the control device 60 stops the temperature increase control.

[0128] Next, regarding the processing of step S11, use the previous Fig.15 Explanation. Fig.15In the dq coordinate system, the first armature current vector Ivt_A is set as the current vector flowing through the armature winding of the first rotating electrical machine 120, and the second armature current vector Ivt_B is set as the current vector flowing through the armature winding of the second rotating electrical machine 220 in the dq coordinate system.

[0129] The control device 60 performs switching control of the first and second inverters 70 and 80 in the same manner as in the fourth embodiment, in such a manner that the first armature current vector Ivt_A and the second armature current vector Ivt_B have the same magnitude and the phase difference between the first armature current vector Ivt_A and the second armature current vector Ivt_B is 180 degrees. Through this control, the second armature current vector Ivt_B also rotates at the same frequency as the first armature current vector Ivt_A rotating at the frequency of the three-phase alternating current. As a result, the torque generated by energizing the armature winding of the second rotating motor 220 can be reduced by the torque generated by energizing the armature winding of the first rotating motor 120. As a result, the torque transmitted to the drive wheel 305 becomes less than the torque threshold Trqth.

[0130] According to the present embodiment described above, the temperatures of the first and second storage batteries 100 and 200 can be rapidly increased while the rotation stop states of the first and second rotors 121 and 221 are maintained.

[0131] <Variation of Fifth Embodiment>

[0132] · In the same manner as the control described in the second and third embodiments, at least one of the amplitude and the frequency may be gradually increased for the d-axis and q-axis currents flowing through the armature windings of the first rotating electrical machine 120 and the d-axis and q-axis currents flowing through the armature windings of the second rotating electrical machine 220. In this case, even if the torque generated by the first and second rotating electrical machines 120 and 220 is unbalanced at the start of the temperature rise control, the gears in the counter gear 303 can be smoothly meshed while suppressing the vibration and torsion of the drive shafts 301 and 302.

[0133] The magnitude of the first armature current vector Ivt_A and the magnitude of the second armature current vector Ivt_B may be different during the temperature increase control on the condition that the torque output from the shaft 304 to the drive wheel 305 is smaller than the torque threshold Trqth.

[0134] Regarding the phase difference γ between the first armature current vector Ivt_A and the second armature current vector Ivt_B during the temperature rise control period, the second armature current vector Ivt_B only needs to have a component that is 180 degrees out of phase with the first armature current vector Ivt_A. It is not limited to 180 degrees and may also be Fig.16 Refer to the previous Fig.16Regarding the phase difference γ, the condition is that the torque output from the shaft 304 to the drive wheel 305 is less than the torque threshold Trqth, and it is set to 90 degrees <γ <270 degrees, for example. It is desirable to be set to 150 degrees ≤γ ≤210 degrees, and more desirably to be set to 170 degrees ≤γ ≤190 degrees.

[0135] The system may also include M (M is an integer greater than or equal to 3) or more sets of rotating electrical machines and inverters. In this case, the control device 60 may control the switching of each inverter in such a manner that the phases of the current vectors flowing through the armature windings of the rotating electrical machines of each set in the dq coordinate system are shifted by 360 / M degrees.

[0136] The battery electrically connected to the first inverter 110 and the battery electrically connected to the second inverter 210 may be a common battery.

[0137] <Other Implementation Methods>

[0138] In addition, each of the above-mentioned embodiments may be implemented by being modified as follows.

[0139] In the temperature increase control of the fourth and fifth embodiments, it is also possible to Fig.11 As shown, the phase current contains high-order harmonic components.

[0140] In the first to third embodiments, the rotating electrical machine is not limited to having only the field winding as the field pole, but may also have a permanent magnet in addition to the field winding. In this case, when the magnetic flux generated by the permanent magnet is set to , the following equation (eq5) is established to replace the above equation (eq1).

[0141]

[0142] When Trq=0 is assumed in the above formula (eq5), the following formula (eq6) is derived.

[0143]

[0144] The following formula (eq7) is derived based on the above formulas (eq2) and (eq6).

[0145]

[0146] According to the above formula (eq7), The excitation current in which the corresponding DC component is superimposed on the AC excitation current If described in the first embodiment is set as the target excitation current Iftgt, whereby the rotation stop state of the rotor 31 can be maintained.

[0147] The rotating electric machine is not limited to one having a field winding on the rotor, and may be one having a field winding on the stator, such as a hybrid field flux switching motor (HEFSM).

[0148] The rotating electrical machine is not limited to a synchronous machine, and may be an asynchronous machine such as an induction machine.

[0149] The rotating electrical machine is not limited to a radial type electrical machine in which the rotor and the stator face each other in the radial direction, but may be an axial type electrical machine in which the rotor and the stator face each other in the axial direction of the rotating shaft.

[0150] The rotating electric machine is not limited to a star-connected electric machine, but may be a Δ-connected electric machine. In addition, the rotating electric machine and the inverter are not limited to a three-phase rotating electric machine and the inverter, but may be a two-phase rotating electric machine and the inverter or a rotating electric machine and the inverter with four or more phases.

[0151] The temperature increase target by the temperature increase control may be, for example, the cooling water in the circulation path 400. When the vehicle is equipped with an air conditioner that uses the cooling water as a heat source for heating the vehicle cabin, the temperature increase control can rapidly increase the temperature of the heat source for heating.

[0152] The heat transfer part is not limited to the heat transfer part using cooling water as the cooling fluid, and may be, for example, an air-cooled heat transfer part using gas (air) as the cooling fluid, or may be a metal heat sink. When a heat sink is used as the heat transfer part, for example, a power converter such as an inverter and a battery may be provided in the heat sink.

[0153] The switch of the inverter is not limited to N-channel MOSFET, and may be, for example, IGBT. In this case, a freewheeling diode may be connected in anti-parallel to the IGBT.

[0154] The power storage unit connected to the power converter such as the inverter is not limited to a battery, and may be, for example, a large-capacity electric double layer capacitor, or a power storage unit including both a battery and an electric double layer capacitor.

[0155] The mobile body on which the control device is mounted is not limited to a vehicle, and may be, for example, an aircraft or a ship. In addition, the object on which the control device is mounted is not limited to a mobile body, and may be a stationary device.

[0156] · The control unit and method described in the present disclosure may also be implemented by a dedicated computer provided by a processor and a memory programmed to execute one or more functions concretized by a computer program. Alternatively, the control unit and method described in the present disclosure may also be implemented by a dedicated computer provided by a processor composed of one or more dedicated hardware logic circuits. Alternatively, the control unit and method described in the present disclosure may also be implemented by one or more dedicated computers composed of a combination of a processor and a memory programmed to execute one or more functions and a processor composed of one or more hardware logic circuits. In addition, the computer program may also be stored in a computer-readable non-transitory tangible recording medium as instructions executed by a computer.

[0157] Hereinafter, characteristic structures extracted from the above-mentioned respective embodiments will be described.

[0158] [Structure 1]

[0159] A control device for a power converter is applied to a system, the system comprising:

[0160] Power storage unit (10, 100, 200);

[0161] A plurality of power converters (20, 40, 70, 80, 110, 210) electrically connected to the power storage unit;

[0162] A rotating electric machine (30, 90, 120, 220) having a winding electrically connected to each of the power converters; and

[0163] A heat transfer unit (400, 401) transfers heat generated in at least one of the power converters to a temperature-increasing object (10, 100, 200).

[0164] The control device of the power converter comprises:

[0165] a determination unit configured to determine whether there is a temperature increase request for the temperature increase object; and

[0166] The control unit, when the determination unit determines that there is a request for heating, controls the switching of each of the power converters in such a manner that an alternating d-axis current and q-axis current are passed through the windings (32, 34U to 34W, 93A, 93B, 123U to 123W, 223U to 223W) while maintaining the rotation stop state of the rotor (31, 91, 121, 221) of the rotating electrical machine.

[0167] [Structure 2]

[0168] A control device for a power converter according to structure 1, wherein:

[0169] The rotating electric machine (30) has a multi-phase armature winding (34U-34W) and an excitation winding (32) as the windings.

[0170] Among the power converters, the power converter electrically connected to the armature winding is a first inverter (20), and the power converter electrically connected to the field winding is a second inverter (40).

[0171] The control unit performs switching control of the first inverter and the second inverter so that a current vector flowing through the field winding in a dq coordinate system has a component that reduces a reluctance torque of the rotating electrical machine while maintaining a rotation stop state of the rotor (31).

[0172] [Structure 3]

[0173] A control device for a power converter according to Structure 2, wherein:

[0174] The rotating electrical machine has a characteristic that the q-axis inductance is greater than the d-axis inductance,

[0175] The control unit performs switching control of the first inverter and the second inverter so that a current vector flowing through the field winding in a dq coordinate system has a component that is 180 degrees out of phase with a current vector flowing through the armature winding in the dq coordinate system.

[0176] [Structure 4]

[0177] A control device for a power converter according to Structure 2, wherein:

[0178] The rotating electrical machine has a characteristic that the d-axis inductance is greater than the q-axis inductance,

[0179] The control unit performs switching control of the first inverter and the second inverter so that a current vector flowing through the field winding in a dq coordinate system has a component having the same phase as a current vector flowing through the armature winding in the dq coordinate system.

[0180] [Structure 5]

[0181] A control device for a power converter according to any one of Structures 2 to 4, wherein:

[0182] The control unit performs switching control of the first inverter and the second inverter so that the generated torque of the rotating electric machine is less than a torque threshold value (Trqth),

[0183] The torque threshold is the torque at which the rotor starts to rotate.

[0184] [Structure 6]

[0185] A control device for a power converter according to any one of Structures 2 to 5, wherein:

[0186] The second inverter includes two sets of series connections of upper arm switches and lower arm switches ( SH1 , SL1 , SH2 , SL2 ) capable of bidirectional current flow.

[0187] [Structure 7]

[0188] A control device for a power converter according to structure 1, wherein:

[0189] The rotating electric machine (90) has a plurality of armature windings (93A, 93B) as the windings.

[0190] The rotor (91) is common to the armature windings of a plurality of systems.

[0191] Each of the power converters is an inverter (70, 80) provided individually corresponding to the armature winding of each system.

[0192] The control unit performs switching control of each of the inverters so that the phases of current vectors flowing through the armature windings of each system in a dq coordinate system are shifted from each other in order to maintain the rotation stop state of the rotor.

[0193] [Structure 8]

[0194] The control device for the power converter according to Structure 7, wherein:

[0195] When the number of armature winding systems is N, the control unit performs switching control of each inverter so that the phases of current vectors flowing through the armature windings of each system in the dq coordinate system are shifted by 360 / N degrees.

[0196] [Structure 9]

[0197] A control device for a power converter according to structure 1, wherein:

[0198] The system comprises a plurality of rotating electrical machines (120, 220) having armature windings (123U to 123W, 223U to 223W) as the windings.

[0199] Each of the power converters is an inverter (110, 210) provided individually corresponding to the armature winding of each of the rotating electrical machines.

[0200] The system includes a power transmission unit (301 to 303) for transmitting power between the rotors (121, 221) of the respective rotating electrical machines.

[0201] The control unit performs switching control of each of the inverters so that phases of current vectors flowing through the armature windings of each of the rotating electrical machines in a dq coordinate system are shifted from each other in order to maintain the rotation stop state of the rotor.

[0202] [Structure 10]

[0203] The control device of the power converter according to structure 9, wherein:

[0204] When the number of the rotating electrical machines is N, the control unit performs switching control of each of the inverters so that the phases of the current vectors flowing through the armature windings of each of the rotating electrical machines in the dq coordinate system are shifted by 360 / N degrees.

[0205] [Structure 11]

[0206] The control device for a power converter according to any one of Structures 1 to 10, wherein:

[0207] When the determination unit determines that there is a temperature increase request, the control unit starts to flow a d-axis current and a q-axis current through the winding and performs switching control of each of the power converters in a manner that gradually increases at least one of an amplitude and a frequency of the d-axis current and the q-axis current flowing through the winding.

[0208] [Structure 12]

[0209] A control device for a power converter according to any one of structures 1 to 11, wherein:

[0210] The system is mounted on a vehicle including drive wheels (12, 305) that rotate by receiving the rotational power of the rotor.

[0211] [Structure 13]

[0212] A program, applied to a system, the system having:

[0213] Power storage unit (10, 100, 200);

[0214] A plurality of power converters (20, 40, 70, 80, 110, 210) electrically connected to the power storage unit;

[0215] A rotating electric machine (30, 90, 120, 220) having a winding electrically connected to each of the power converters;

[0216] a heat transfer unit (400, 401) for transferring heat generated in at least one of the power converters to a temperature-increasing object (10, 100, 200); and

[0217] Computer (61),

[0218] The program causes the computer to function as the following determination unit and control unit:

[0219] The determination unit determines whether there is a temperature increase request for the temperature increase object,

[0220] When the determination unit determines that there is a request for heating, the control unit controls the switching of each of the power converters in such a manner that an AC d-axis current and an AC q-axis current are passed through the windings (32, 34U to 34W, 93A, 93B, 123U to 123W, 223U to 223W) while maintaining the rotation stop state of the rotor (31, 91, 121, 221) of the rotating electrical machine.

[0221] The present disclosure is described based on the embodiments, but it should be understood that the present disclosure is not limited to the embodiments and configurations. The present disclosure also includes various modifications and modifications within the equivalent range. In addition, various combinations and methods, as well as other combinations and methods containing only one element, above or below them, also fall within the scope and thought range of the present disclosure.

Claims

1. A control device for a power converter, applied to a system, the system comprising: Power storage unit (10, 100, 200); A plurality of power converters (20, 40, 70, 80, 110, 210) electrically connected to the power storage unit; A rotating electric machine (30, 90, 120, 220) having a winding electrically connected to each of the power converters; and A heat transfer unit (400, 401) transfers heat generated in at least one of the power converters to a temperature-increasing object (10, 100, 200). The control device for the power converter is characterized by comprising: a determination unit configured to determine whether there is a temperature increase request for the temperature increase object; and The control unit, when the determination unit determines that there is a request for heating, controls the switching of each of the power converters in such a manner that an alternating d-axis current and q-axis current are passed through the windings (32, 34U to 34W, 93A, 93B, 123U to 123W, 223U to 223W) while maintaining the rotation stop state of the rotor (31, 91, 121, 221) of the rotating electrical machine.

2. The control device for a power converter according to claim 1, characterized in that: The rotating electric machine (30) has a multi-phase armature winding (34U-34W) and an excitation winding (32) as the windings. Among the power converters, the power converter electrically connected to the armature winding is a first inverter (20), and the power converter electrically connected to the field winding is a second inverter (40). The control unit performs switching control of the first inverter and the second inverter so that a current vector flowing through the field winding in a dq coordinate system has a component that reduces a reluctance torque of the rotating electrical machine while maintaining a rotation stop state of the rotor (31).

3. The control device for a power converter according to claim 2, characterized in that: The rotating electrical machine has a characteristic that the q-axis inductance is greater than the d-axis inductance, The control unit performs switching control of the first inverter and the second inverter so that a current vector flowing through the field winding in a dq coordinate system has a component that is 180 degrees out of phase with a current vector flowing through the armature winding in the dq coordinate system.

4. The control device for a power converter according to claim 2, characterized in that: The rotating electrical machine has a characteristic that the d-axis inductance is greater than the q-axis inductance, The control unit performs switching control of the first inverter and the second inverter so that a current vector flowing through the field winding in a dq coordinate system has a component having the same phase as a current vector flowing through the armature winding in the dq coordinate system.

5. The control device for a power converter according to any one of claims 2 to 4, characterized in that: The control unit performs switching control of the first inverter and the second inverter so that the generated torque of the rotating electric machine is less than a torque threshold value (Trqth), The torque threshold is the torque at which the rotor starts to rotate.

6. The control device for a power converter according to claim 2, characterized in that: The second inverter includes two sets of series connections of upper arm switches and lower arm switches ( SH1 , SL1 , SH2 , SL2 ) capable of bidirectional current flow.

7. The control device for a power converter according to claim 1, characterized in that: The rotating electric machine (90) has a plurality of armature windings (93A, 93B) as the windings. The rotor (91) is common to the armature windings of a plurality of systems. Each of the power converters is an inverter (70, 80) provided individually corresponding to the armature winding of each system. The control unit performs switching control of each of the inverters so that the phases of current vectors flowing through the armature windings of each system in a dq coordinate system are shifted from each other in order to maintain the rotation stop state of the rotor.

8. The control device for a power converter according to claim 7, characterized in that: When the number of armature winding systems is N, the control unit performs switching control of each inverter in such a manner that the phases of current vectors flowing through the armature windings of each system in the dq coordinate system are shifted by "360 / N" degrees.

9. The control device for a power converter according to claim 1, characterized in that: The system comprises a plurality of rotating electrical machines (120, 220) having armature windings (123U to 123W, 223U to 223W) as the windings. Each of the power converters is an inverter (110, 210) provided individually corresponding to the armature winding of each of the rotating electrical machines. The system includes a power transmission unit (301 to 303) for transmitting power between the rotors (121, 221) of the respective rotating electrical machines. The control unit performs switching control of each of the inverters so that phases of current vectors flowing through the armature windings of each of the rotating electrical machines in a dq coordinate system are shifted from each other in order to maintain the rotation stop state of the rotor.

10. The control device for a power converter according to claim 9, characterized in that: When the number of the rotating electrical machines is N, the control unit performs switching control of each of the inverters in such a manner that the phases of the current vectors flowing through the armature windings of each of the rotating electrical machines in the dq coordinate system are shifted by "360 / N" degrees.

11. The control device for a power converter according to any one of claims 1 to 4 and 6 to 10, characterized in that: When the determination unit determines that there is a temperature increase request, the control unit starts to flow a d-axis current and a q-axis current through the winding and performs switching control of each of the power converters in a manner that gradually increases at least one of an amplitude and a frequency of the d-axis current and the q-axis current flowing through the winding.

12. The control device for a power converter according to any one of claims 1 to 4 and 6 to 10, characterized in that: The system is mounted on a vehicle including drive wheels (12, 305) that rotate by receiving the rotational power of the rotor.

13. A program, applied to a system, the system having: Power storage unit (10, 100, 200); A plurality of power converters (20, 40, 70, 80, 110, 210) electrically connected to the power storage unit; A rotating electric machine (30, 90, 120, 220) having a winding electrically connected to each of the power converters; a heat transfer unit (400, 401) for transferring heat generated in at least one of the power converters to a temperature-increasing object (10, 100, 200); and Computer (61), The program is characterized in that it causes the computer to function as the following determination unit and control unit: The determination unit determines whether there is a temperature increase request for the temperature increase object, When the determination unit determines that there is a request for heating, the control unit controls the switching of each of the power converters in such a manner that an AC d-axis current and an AC q-axis current are passed through the windings (32, 34U to 34W, 93A, 93B, 123U to 123W, 223U to 223W) while maintaining the rotation stop state of the rotor (31, 91, 121, 221) of the rotating electrical machine.

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