Control device, program, and control method for power converters

Abstract

A control device (60) is applied to a system comprising: a power storage unit (10, 100, 200); a plurality of power converters (20, 40, 70, 80, 110, 210); a rotary electric machine (30, 90, 120, 220) that has windings electrically connected to the power converters; and a heat transfer unit (400, 401) that transfers the heat generated in at least one of the power converters to an element to be heated (10, 100, 200). The control device comprises: a determination unit that determines whether there is a need to heat the element to be heated; and a control unit that, when the determination unit determines that there is a need to heat the element to be heated, performs power converter switching control whereby a rotation stopped state of a rotor (31, 91, 121, 221) of the rotary electric machine is maintained while alternating d / q axis currents are supplied to the windings (32, 34U-34W, 93A, 93B, 123U-123W, 223U-223W).

Description

Cross-reference to related applications

[0001] This application is based on Japanese Application No. 2022-109667 filed on July 7, 2022, the contents of which are incorporated herein by reference.

Technical Field

[0002] The present disclosure relates to a control device for a power converter , Program and control method thereof.

Background Art

[0003] Conventionally, as described in Patent Document 1, a control device applied to a vehicle including a battery, an inverter electrically connected to the battery, and a rotating electric machine having an armature winding electrically connected to the inverter is known. This control device performs switching control of the inverter while the vehicle is stopped, so that a d-axis current flows through the armature winding while setting the q-axis current flowing through the armature winding to 0. As a result, the battery can be warmed up while maintaining the rotational stop state of the rotor of the rotating electric machine. As a result, the battery can be warmed up while maintaining the stopped state of the vehicle.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] In order to rapidly warm up a warming target such as a battery, it is conceivable to flow a q-axis current in addition to the d-axis current. However, in this case, there is a concern that torque is generated in the rotating electric machine and the rotor cannot be maintained in the rotational stop state.

[0006] The present disclosure provides a control device for a power converter that can rapidly warm up a warming target while maintaining the rotational stop state of the rotor of a rotating electric machine , Program and control methodThe primary purpose is to provide [this].

[0007] This disclosure relates to the energy storage unit and Multiple power converters electrically connected to the aforementioned energy storage unit, A rotating electric machine having windings electrically connected to each of the aforementioned power converters, A heat transfer unit that transfers the heat generated in at least one of the aforementioned power converters to the object to be heated, In a control device for a power converter applied to a system comprising: A determination unit for determining whether or not there is a request to raise the temperature of the object to be heated, The system includes a control unit that, when the determination unit determines that there is a request for temperature increase, controls the switching of each power converter so as to allow alternating currents in the d and q axes to flow through the windings while maintaining the rotational stop state of the rotor of the rotating electric machine.

[0008] According to this disclosure, by adding a q-axis current in addition to the d-axis current, the amount of heat generated by switching control can be increased. Therefore, by transferring the heat generated by switching control to the object to be heated via the heat transfer unit, the object to be heated can be heated rapidly. At this time, the rotor can be kept stationary. [Brief explanation of the drawing]

[0009] The purposes and other purposes, features and benefits of this disclosure will be further clarified by the following detailed description with reference to the attached drawings. Those drawings are: [Figure 1] Figure 1 is an overall configuration diagram of the in-vehicle system according to the first embodiment. [Figure 2] Figure 2 is a diagram showing an overview of the cooling system as a heat transfer unit. [Figure 3] Figure 3 shows the changes in three-phase AC current, d and q-axis currents, field current, and torque during temperature rise control. [Figure 4] Figure 4 shows the current vector during temperature control in the dq coordinate system. [Figure 5]FIG. 5 is a diagram showing the transitions of a three-phase alternating current, d-axis and q-axis currents, field current, and torque in the temperature rise control according to the comparative example. [Figure 6] FIG. 6 is a flowchart showing the processing procedure of the temperature rise control. [Figure 7] FIG. 7 is a diagram showing the current vector during the temperature rise control in the dq coordinate system according to a modification of the first embodiment. [Figure 8] FIG. 8 is a diagram showing the current vector during the temperature rise control in the dq coordinate system according to a modification of the first embodiment. [Figure 9] FIG. 9 is a diagram showing the current vector during the temperature rise control in the dq coordinate system according to a modification of the first embodiment. [Figure 10] FIG. 10 is a diagram showing the current vector during the temperature rise control in the dq coordinate system according to a modification of the first embodiment. [Figure 11] FIG. 11 is a diagram showing the current to be passed during the temperature rise control according to a modification of the first embodiment. [Figure 12] FIG. 12 is a diagram showing the transition of the current during the temperature rise control according to the second embodiment. [Figure 13] FIG. 13 is a diagram showing the transition of the current during the temperature rise control according to the third embodiment. [Figure 14] FIG. 14 is an overall configuration diagram of the in-vehicle system according to the fourth embodiment. [Figure 15] FIG. 15 is a diagram showing the current vector during the temperature rise control in the dq coordinate system. [Figure 16] FIG. 16 is a diagram showing the current vector during the temperature rise control in the dq coordinate system according to a modification of the fourth embodiment. [Figure 17] FIG. 17 is an overall configuration diagram of the in-vehicle system according to the fifth embodiment.

MODE FOR CARRYING OUT THE INVENTION

[0010] <First Embodiment> Hereinafter, a first embodiment in which a control device according to the present disclosure is embodied will be described with reference to the drawings. The system including the control device of this embodiment is mounted on a vehicle such as an electric vehicle or a hybrid vehicle.

[0011] As shown in FIG. 1, the system includes a storage battery 10 (corresponding to a "power storage unit"), two power converters, and a rotating electric machine 30. In this embodiment, the rotating electric machine 30 is a wound-field type rotating electric machine. Further, the rotating electric machine 30 has a reverse salient-pole characteristic in which the q-axis inductance Lq is larger than the d-axis inductance Ld.

[0012] The storage battery 10 is a battery pack configured as a series connection body of battery cells that are single cells. The battery cells are secondary batteries such as lithium-ion batteries, for example. The storage battery 10 can be charged by an external charger provided outside the vehicle. The external charger is, for example, a stationary charger.

[0013] The rotating electric machine 30 includes a rotor 31. The rotor 31 includes a field winding 32. The rotating shaft of the rotor 31 can be power-transmitted to the drive wheels 12 of the vehicle via a power transmission mechanism 11 provided in the vehicle. The torque generated when the rotating electric machine 30 functions as a motor is transmitted to the drive wheels 12 via the power transmission mechanism 11, and the drive wheels 12 rotate. Note that the power transmission mechanism 11 includes, for example, a transmission and a shaft. Further, the rotating electric machine 30 may be, for example, an in-wheel motor provided integrally with the drive wheels 12 of the vehicle, or an on-board motor provided in the vehicle body of the vehicle.

[0014] The rotating electric machine 30 includes a stator 33. The stator 33 includes U, V, and W phase windings 34U, 34V, and 34W that are star-connected in a state where they are electrically angled 120° apart from each other as armature windings.

[0015] The system includes an inverter 20 (corresponding to the "first inverter") and a field current supply circuit 40 (corresponding to the "second inverter") as power converters. The inverter 20 converts the DC current from the battery 10 into AC current and supplies it to the armature winding. The inverter 20 includes a series connection of U, V, W phase upper arm switches SUH, SVH, SWH and U, V, W phase lower arm switches SUL, SVL, SWL. In this embodiment, each switch SUH, SVH, SWH, SUL, SVL, SWL is an N-channel MOSFET. Each switch SUH, SVH, SWH, SUL, SVL, SWL includes a body diode DUH, DVH, DWH, DUL, DVL, DWL.

[0016] The positive terminal of the battery 10 is connected to the drain, which is the high-potential terminal of the U, V, W phase upper arm switches SUH, SVH, SWH, via the high-potential electrical path Lp. The negative terminal of the battery 10 is connected to the source, which is the low-potential terminal of the U, V, W phase lower arm switches SUL, SVL, SWL, via the low-potential electrical path Ln. Each electrical path Lp and Ln is a conductive member such as a busbar. The inverter 20 is equipped with a first capacitor 21, which is a smoothing capacitor. The first capacitor 21 may be provided outside the inverter 20.

[0017] The field current supply circuit 40 supplies current from the battery 10 to the field winding 32. The field current supply circuit 40 in this embodiment is a full-bridge circuit and comprises 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 this embodiment, each switch SH1, SH2, SL1, and SL2 are N-channel MOSFETs. Each switch SH1, SH2, SL1, and SL2 are equipped with body diodes DH1, DH2, DL1, and DL2. Each switch SH1, SH2, SL1, and SL2 are bidirectional conducting switching elements that, when turned on, allow current to flow from drain to source and from source to drain.

[0018] The positive terminal of the battery 10 is connected to the drain, which is the high-potential terminal of the first and second upper arm switches SH1 and SH2, via the high-potential electrical path Lp. The negative terminal of the battery 10 is connected to the source, which is the low-potential terminal of the first and second lower arm switches SL1 and SL2, via the low-potential electrical path Ln. The first end of the field winding 32 is connected to the connection point between 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 between the second upper arm switch SH2 and the second lower arm switch SL2 via a brush (not shown). The field current supply circuit 40 includes a second capacitor 41, which is a smoothing capacitor. The second capacitor 41 may be provided outside the field current supply circuit 40. Alternatively, instead of a configuration in which a second capacitor 41 is individually provided in the field current circuit 40 and a first capacitor 21 is individually provided in the inverter 20, a configuration in which a common capacitor is provided in the inverter 20 and the field current circuit 40 may be used. In this case, for example, a configuration in which the second capacitor 41 is not provided may be used.

[0019] As shown in Figure 2, the system includes a device for cooling the inverter 20, field current circuit 40, rotating electric machine 30, and battery 10 when the inverter 20 is being switched to operate in order to drive the vehicle. More specifically, the vehicle includes a circulation path 400 through which cooling water circulates, an electric water pump 401, a radiator 402, and an electric fan 403. The water pump 401 circulates the cooling water when it is powered and driven. In the example shown in Figure 2, the inverter 20, field current circuit 40, rotating electric machine 30, and battery 10 are arranged in order downstream of the water pump 401 in the circulation path 400. Note that the arrangement order in the circulation path 400 is not limited to the order shown in Figure 2.

[0020] A radiator 402 is provided between the water pump 401 and the battery 10 in the circulation path 400. The radiator 402 cools the coolant flowing in through the circulation path 400 and supplies it to the water pump 401. The coolant flowing into the radiator 402 is cooled by the airflow blown onto the radiator 402 as the vehicle moves, and by the airflow blown onto the radiator 402 by rotating the fan 403.

[0021] The water pump 401 and fan 403 may be driven by a control device separate from the control device 60. However, for convenience, in this embodiment, the water pump 401 and fan 403 are assumed to be driven by the control device 60 provided by the system.

[0022] Returning to the explanation of Figure 1, the system includes a voltage sensor 50, a phase current sensor 51, a field 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 of the U, V, and W phase windings 34U, 34V, and 34W. The field current sensor 52 detects the field current flowing through the field 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 detected values ​​of each sensor 50 to 54 are input to the control device 60.

[0023] The control device 60 is mainly composed of a microcontroller 61, which is equipped with a CPU. The functions provided by the microcontroller 61 can be provided by software recorded in a physical memory device and a computer that executes it, by software only, by hardware only, or by a combination thereof. For example, if the microcontroller 61 is provided by hardware electronic circuits, it can be provided by digital circuits including a large number of logic circuits, or by analog circuits. For example, the microcontroller 61 executes a program stored in a non-transitory tangible storage medium, which serves as its own storage unit. The program includes, for example, a program for processing as shown in Figure 6, which will be described later. When the program is executed, the method corresponding to the program is executed. The storage unit is, for example, non-volatile memory. The program stored in the storage unit can be updated via a communication network such as the Internet, for example, OTA (Over The Air).

[0024] The control device 60 controls the switching of each switch constituting the field current circuit 40 in order to excite the field winding 32. Specifically, the control device 60 controls the switching so that a first state and a second state alternately occur in order to control the field current If detected by the field current sensor 52 to a target field current Iftgt. The first state is when the first upper arm switch SH1 and the second lower arm switch SL2 are ON, and the second upper arm switch SH2 and the first lower arm switch SL1 are OFF. The second state is when the first upper arm switch SH1 and the second lower arm switch SL2 are OFF, and the second upper arm switch SH2 and the first lower arm switch SL1 are ON.

[0025] When the field winding 32 is energized, the control device 60 controls the switching of each switch constituting the inverter 20 in order to feed back the control amount of the rotating electric machine 30 to a command value based on the detection values ​​of each sensor 50 to 54. In this embodiment, the control amount is torque. In each phase, the upper arm switch and the lower arm switch are turned on alternately. Through this feedback control, the rotational power of the rotor 31 is transmitted to the drive wheels 12, causing the vehicle to move.

[0026] Next, the temperature rise control of the battery 10 executed by the control device 60 will be described. This control is performed when the battery 10 is being charged by an external charger while the vehicle is stopped, and when the temperature of the battery 10 detected by the temperature sensor 54 falls below the target temperature Ttgt, heat is generated by switching control of the inverter 20 and the field current circuit 40. The generated heat is transferred to the battery 10 via cooling water circulating in the circulation path 400 by the drive of the water pump 401. The temperature rise control is continued, for example, until the temperature of the battery 10 reaches the target temperature Ttgt. The drive of the water pump 401 is also continued at least while the temperature rise control is being performed. In this embodiment, the circulation path 400, the cooling water circulating in the circulation path 400, and the water pump 401 correspond to the "heat transfer section". The temperature rise control rapidly raises the temperature of the battery 10, thereby shortening the charging time of the battery 10 by the external charger.

[0027] To enhance the heating capacity through heating control, the control device 60 controls the switching of the inverter 20 to allow d and q axis currents to flow through the armature windings during heating control. At this time, in order to maintain the rotational stop state of the rotor 31 and maintain the stationary state of the vehicle, the control device 60 controls the switching of the field energizing circuit 40 to reduce the reluctance torque generated by the flow of d and q axis currents using magnet torque. The heating control will be explained in detail below.

[0028] The torque Trq generated by the rotating electric machine 30 consists of a magnet torque TM and a reluctance torque TR, as shown in equation (eq1) below. In equation (eq1), P represents the number of pole pairs of the rotating electric machine 30, and φf represents the magnetic flux generated by the flow of field current through the field winding.

[0029] Trq = TM + TR =P·φf·Iq+P·(Lq-Ld)·Id·Iq…(eq1) In temperature rise control, the control device 60 controls the switching of the inverter 20 so that sinusoidal three-phase AC currents IU, IV, and IW, which are 120 degrees out of phase in electrical angle, flow through each phase winding 34U to 34W, as shown in Figure 3(A). In this case, sinusoidal d and q axis currents Id and Iq flow, as shown in Figure 3(B). In this case, the frequencies of the d 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.

[0030] On the other hand, the magnetic flux φf is proportional to the product of the number of turns Nf of the field winding 32 and the field current If, as shown in equation (eq2) below.

[0031] φf∝Nf·If …(eq2) The condition that the reluctance torque TR is offset by the magnetic torque TM is imposed on equation (eq1) above. Specifically, Trq = 0 in equation (eq1) above. In this case, equation (eq3) below is derived.

[0032] φf = -(Lq - Ld)·Id …(eq3) Equation (eq4) can be derived from equations (eq2) and (eq3) above.

[0033] If ∝ - (Lq - Ld) · Id / Nf … (eq4) In this embodiment, Lq > Ld in (eq4). Therefore, as shown in Figure 3(C), the control device 60 sets a sinusoidal target field current Iftgt that is 180 degrees different in phase from the d-axis current Id and has the same frequency as the d-axis current Id. The control device 60 controls the switching of the field energizing circuit 40 so that the field current If detected by the field current sensor 52 becomes the target field current Iftgt. As a result, as shown in Figure 3(D), the difference between the reluctance torque TR and the magnet torque TM can be made smaller than the torque threshold Trqth. The torque threshold Trqth is the torque at which the drive wheel 12 begins to rotate, and is set, for example, to the upper limit of the range assumed to be the torque at which the drive wheel 12 begins to rotate. According to the temperature rise control described above, the rotor 31 can be kept in a stopped state, and the occurrence of situations that cause discomfort to the vehicle user can be suppressed. Note that Tf shown in Figure 3 is one period of the d-axis current Id and the field current If.

[0034] In the temperature rise control of this embodiment, switching control of the three-phase upper and lower arm switches is performed. Therefore, the heat generated in the inverter 20 during the execution of the temperature rise control can be distributed to each phase and each arm.

[0035] Figure 4 shows the current flowing during temperature rise control in a dq coordinate system. In Figure 4, Ivt_3ph represents the current vector flowing through the armature winding in the dq coordinate system (hereinafter referred to as the armature current vector), and Ivt_fld represents the current vector flowing through the field winding 32 in the dq coordinate system (hereinafter referred to as 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 alternating current. The control device 60 performs switching control of the inverter 20 and the field energizing circuit 40 so 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 comes to have a component that reduces the reluctance torque of the rotating electric machine 30, and more specifically, a component that brings the reluctance torque closer to 0.

[0036] In contrast, in the comparative example shown in Figure 5, the field current If is maintained at 0 during temperature rise control. As a result, the torque Trq generated by the rotating electric machine pulsates significantly, and the generated torque exceeds the torque threshold Trqth. Incidentally, even when the field current If is maintained at a constant value other than 0 during temperature rise control, the torque Trq generated by the rotating electric machine pulsates significantly, and the generated torque exceeds the torque threshold Trqth.

[0037] Figure 6 is a flowchart showing the temperature rise control process performed by the control device 60. This process is performed, for example, when the control device 60 determines that charging of the storage battery 10 by an external charger has started.

[0038] In step S10, it is determined whether or not there is a request to raise the temperature of the battery 10. In this embodiment, it is determined that there is a request to raise the temperature if the detected temperature of the battery 10 is below the target temperature Ttgt. In this embodiment, the process in step S10 corresponds to the "determination unit".

[0039] If it is determined in step S10 that there is a request for temperature increase, the process proceeds to step S11, where switching control of the inverter 20 and the field energizing circuit 40 is performed in order to carry out the temperature increase control described above.

[0040] In step S12, it is determined whether the temperature Tobj of the object to be heated has reached the target temperature Ttgt. In this embodiment, as described above, since the object to be heated is the storage battery 10, the temperature Tobj of the object to be heated is the temperature of the storage battery 10.

[0041] If it is determined in step S12 that the temperature of the battery 10 is less than the target temperature Ttgt, the switching control in 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 rise control is stopped. In this embodiment, the processing in steps S11 and S12 corresponds to the "control unit".

[0042] Incidentally, during the temperature rise control process, the rotation of the fan 403 may be stopped in order to suppress the temperature drop of the cooling water in the circulation path 400.

[0043] As described in detail above, this embodiment allows for increased heat generation in the inverter 20, field current circuit 40, and rotating electric machine 30 (e.g., armature winding). The generated heat is transferred to the battery 10 via the circulation path 400. This allows the battery 10 to heat up rapidly, thereby shortening the charging time of the battery 10 by external charging. In this case, the rotor 31 can be kept stationary, preventing any discomfort to the vehicle user during external charging.

[0044] <Modified form of the first embodiment> The phase difference α between the armature current vector Ivt_3ph and the field current vector Ivt_fld during temperature rise control is not limited to 180 degrees, but may be the angle shown in Figure 7, provided that the field current vector Ivt_fld has a component that reduces the reluctance torque. The phase difference α shown in Figure 7 is considered positive when the field current vector Ivt_fld advances clockwise relative to the armature current vector Ivt_3ph. The phase difference α should be set, for example, to 90 degrees < α < 270 degrees, preferably to 150 degrees ≤ α ≤ 210 degrees, and more preferably to 170 degrees ≤ α ≤ 190 degrees, provided that the torque Trq generated by the rotating electric machine 30 is smaller than the torque threshold Trqth.

[0045] The rotating electric machine 30 may have a salient polarity in which the d-axis inductance Ld is greater than the q-axis inductance Lq. In this case, based on the above equation (eq4), as shown in Figure 8, the inverter 20 and the field energizing circuit 40 should be switched and controlled so that the phase difference α between the field current vector Ivt_fld and the armature current vector Ivt_3ph becomes 0 degrees during temperature rise control.

[0046] In the case of salient polarity, the phase difference α is not limited to 0 degrees, but may be the angles shown in Figures 9 and 10, provided that the field current vector Ivt_fld has a component that reduces the reluctance torque. The phase difference α is set, for example, to -90 degrees < α < 90 degrees, preferably to -30 degrees ≤ α ≤ 30 degrees, and more preferably to -10 degrees ≤ α ≤ 10 degrees, provided that the torque Trq generated by the rotating electric machine 30 is smaller than the torque threshold Trqth. Figures 9 and 10 show the case where the phase difference α is negative.

[0047] • In temperature rise control, the current flowing through each phase winding 34U~34W and the field winding 32 is not limited to a sinusoidal current; it may also be a sinusoidal current containing harmonic components, as shown in Figures 11(A) and (B), or a rectangular wave current, as shown in Figures 11(C) and (D).

[0048] The control device 60 can vary the torque threshold Trqth. For example, when the vehicle's parking brake is engaged, the torque threshold Trqth is set to be higher than when it is not engaged.

[0049] Furthermore, the control device 60 has an acquisition unit that acquires the road surface temperature of the vehicle, and may change the torque threshold Trqth based on the acquired road surface temperature. Here, map information relating the road surface temperature and the torque threshold Trqth may be used.

[0050] The control device 60 may also apply braking torque to the vehicle's wheels using a mechanical brake system provided on the vehicle while temperature rise control is being performed.

[0051] <Second Embodiment> The second embodiment will now be described, focusing on the differences from the first embodiment, with reference to the drawings. In this embodiment, the control device 60 controls the switching of the inverter 20 and the field current supply circuit 40 so as to gradually increase the amplitude of the d,q axis currents and the field current during the execution of temperature rise control.

[0052] Figure 12 shows an example of temperature rise control in this embodiment. 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 supply circuit 40 in order to start supplying d,q axis currents Id,Iq to the armature winding and field current If to the field winding 32. Subsequently, the control device 60 performs switching control of the inverter 20 and the field current supply circuit 40 to gradually increase the amplitude of the d,q axis currents Id,Iq and the field current If.

[0053] According to the embodiment described above, vibration of the shaft included in the power transmission mechanism 11 can be suppressed at the start of temperature rise control.

[0054] Furthermore, if the amplitude reaches its maximum value before the temperature of the storage battery 10 reaches the target temperature Ttgt, the control device 60 may stop the gradual increase of the amplitude and fix the amplitude at its maximum value.

[0055] <Third Embodiment> The third embodiment will now be described, focusing on the differences from the first embodiment, with reference to the drawings. In this embodiment, the control device 60 controls the switching of the inverter 20 and the field current circuit 40 so as to gradually increase the frequencies of the d, q axis currents and the field current during the execution of temperature rise control.

[0056] Figure 13 shows an example of temperature rise control in this embodiment. At time t1, the control device 60 determines that there is a request for temperature rise. As a result, the control device 60 starts switching control of the inverter 20 and the field current supply circuit 40 in order to start supplying d,q axis currents Id,Iq to the armature winding and field current If to the field winding 32. Subsequently, the control device 60 performs switching control of the inverter 20 and the field current supply circuit 40 to gradually increase the frequencies of the d,q axis currents Id,Iq and the field current If.

[0057] According to the embodiment described above, the same effects as those of the second embodiment can be obtained.

[0058] Furthermore, if the frequency reaches its maximum value before the temperature of the storage battery 10 reaches the target temperature Ttgt, the control device 60 may stop the gradual increase of the frequency and fix the frequency at its maximum value.

[0059] <Modified form of the third embodiment> In temperature rise control, the amplitude may be gradually increased along with the frequency of the d,q axis currents Id, Iq and the field current If.

[0060] <Fourth Embodiment> The fourth embodiment will now be described, focusing on the differences from the first embodiment, with reference to the drawings. In this embodiment, the configuration of the rotating electric machine and inverter has been changed, as shown in Figure 14. In Figure 14, components identical to those shown in Figure 1 are denoted by the same reference numerals for convenience.

[0061] The system includes a rotating electric machine 90 having two armature windings. The rotating electric machine 90 is a synchronous machine and includes a rotor 91 and a stator 92. The rotor 91 is equipped with permanent magnets as field poles. The rotation shaft of the rotor 91 is capable of transmitting power to the drive wheels 12 via a power transmission mechanism 11 provided in the vehicle.

[0062] 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 connected in a star configuration with an electrical angle offset of 120° from each other. The second armature winding 93B includes U, V, and W phase windings UB, VB, and WB connected in a star configuration with an electrical angle offset of 120° from each other. The rotor 91 is common to both armature windings 93A and 93B. In this 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 assumed to be 0.

[0063] The system includes a first inverter 70, which is individually provided for the first armature winding 93A, and a second inverter 80, which is individually provided for the second armature winding 93B.

[0064] The first inverter 70, like the inverter 20 of the first embodiment, comprises 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 is equipped with a body diode DUAH, DVAH, DWAH, DUAL, DVAL, DWAL.

[0065] The second inverter 80, like the first inverter 70, is equipped with 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. Each switch SUBH, SVBH, SWBH, SUBL, SVBL, SWBL is equipped with a body diode DUBH, DVBH, DWBH, DUBL, DVBL, DWBL.

[0066] The positive terminal of the battery 10 is connected to the drain of the upper arm switch of the first inverter 70 and the second inverter 80 via a high-potential electrical path Lp. The negative terminal of the battery 10 is connected to the source of the lower arm switch of the first inverter 70 and the second inverter 80 via a low-potential electrical path Ln. The first inverter 70 is equipped with a first capacitor 71, which is a smoothing capacitor. The second inverter 80 is equipped with a second capacitor 81, which is a smoothing capacitor.

[0067] The system is equipped with a cooling device as shown in Figure 2. The circulation path 400 that constitutes the cooling device includes a first inverter 70, a second inverter 80, a rotating electric machine 90, and a storage battery 10.

[0068] 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 that detects the phase currents of at least two phases flowing through the first armature winding 93A, and a second current sensor that detects the phase currents of at least two phases flowing through the second armature winding 93B.

[0069] Based on the detection values ​​of each sensor 50, 51, 53, and 54, the control device 60 controls the switching of switches constituting the first and second inverters 70 and 80 in order to feed back the torque of the rotating electric machine 90 to the command torque. Through this feedback control, the rotational power of the rotor 91 is transmitted to the drive wheels 12, causing the vehicle to move.

[0070] The control device 60 controls the switching of the first inverter 70 to control the torque generated when the first armature winding 93A is energized to the first command torque, and controls the switching of the second inverter 80 to control the torque generated when the second armature winding 93B is energized to the second command torque. As a result, the torque generated by the rotating electric machine 90 is controlled to the sum of the first command torque and the second command torque. The first command torque and the second command torque are, for example, the same value.

[0071] Next, the temperature rise control of the storage battery 10, which is performed by the control device 60, will be described. In this embodiment, only the process of step S11 is changed from the process shown in Figure 6. The temperature rise control of this embodiment will be described below using Figure 15. In Figure 15, Ivt_A represents the current vector flowing through the first armature winding 93A in the dq coordinate system (hereinafter referred to as the first armature current vector), and Ivt_B represents the current vector flowing through the second armature winding 93B in the dq coordinate system (hereinafter referred to as the second armature current vector).

[0072] The control device 60 controls the switching of the first and second inverters 70 and 80 so that the magnitudes of the first armature current vector Ivt_A and the second armature current vector Ivt_B are the same, and the phase difference between the first armature current vector Ivt_A and the second armature current vector Ivt_B is 180 degrees. This control causes the second armature current vector Ivt_B to rotate at the same frequency as the first armature current vector Ivt_A, which rotates at the frequency of the three-phase AC current. As a result, the torque generated when the first armature winding 93A is energized can be reduced by the torque generated when the second armature winding 93B is energized, and specifically, the torque generated when the first armature winding 93A is energized can be brought close to zero. As a result, the torque generated by the rotating electric machine 90 becomes smaller than the torque threshold Trqth.

[0073] According to the embodiment described above, the battery 10 can be rapidly heated up while maintaining the rotational stop state of the rotor 91.

[0074] <Modified form of the fourth embodiment> Similar to the control described in the second and third embodiments, the amplitude and frequency of at least one of the d,q-axis currents flowing through the first armature winding 93A and the d,q-axis currents flowing through the second armature winding 93B may be gradually increased. In this case, even if an imbalance occurs in the currents flowing through the first and second armature windings 93A and 93B at the start of the temperature rise control, the effects of that imbalance can be suppressed.

[0075] - Provided that the torque generated by the rotating electric machine 90 is less than the torque threshold Trqth, the magnitudes of the first armature current vector Ivt_A and the second armature current vector Ivt_B may be different in the temperature rise control.

[0076] During temperature rise control, the phase difference β between the first armature current vector Ivt_A and the first armature current vector Ivt_B is not limited to 180 degrees, but may be the angle shown in Figure 16, provided that the second armature current vector Ivt_B has a component that is 180 degrees different in phase from the first armature current vector Ivt_A. The phase difference β shown in Figure 16 is considered positive when the second armature current vector Ivt_B advances clockwise relative to the first armature current vector Ivt_A. The phase difference β should be set, for example, to 90 degrees < β < 270 degrees, preferably to 150 degrees ≤ β ≤ 210 degrees, and more preferably to 170 degrees ≤ β ≤ 190 degrees, provided that the torque Trq generated by the rotating electric machine 90 is smaller than the torque threshold Trqth.

[0077] The armature windings and inverters of the rotating electric machine may consist of M (where M is an integer of 3 or more) systems or more. In this case, the control device 60 may, for example, perform switching control of each inverter so as to shift the phase of the current vectors flowing through the armature windings of each system by "360 / M" degrees in the dq coordinate system.

[0078] <Fifth Embodiment> The fifth embodiment will now be described, focusing on the differences from the first embodiment, with reference to the drawings. In this embodiment, the configuration of the rotating electric machine and inverter has been changed, as shown in Figure 17. In Figure 17, components identical to those shown in Figures 1 and 14 are denoted by the same reference numerals for convenience.

[0079] The system is equipped with two sets of rotating electric machines and inverters. The rotational power of the rotors of each rotating electric machine is transmitted to the vehicle's drive wheels 305 via the vehicle's power transmission mechanism.

[0080] The system comprises a first battery 100 and a second battery 200 (corresponding to the "energy 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 and 220 is a permanent magnet field type synchronous machine, similar to the fourth embodiment. Each battery 100 and 200 is a battery pack, and is a secondary battery such as a lithium-ion battery. Each battery 100 and 200 can be charged by an external charger provided outside the vehicle.

[0081] The first rotating electric machine 120 is equipped with a first rotor 121. The second rotating electric machine 220 is equipped with a second rotor 221. The rotation shafts of the first rotor 121 and the second rotor 221 are connected to the drive wheels 305 via a power transmission mechanism. The power transmission mechanism comprises a first drive shaft 301, a second drive shaft 302, a counter gear 303, and a shaft 304. The rotation shaft of the first rotor 121 is connected to the counter gear 303 via the first drive shaft 301, and the rotation shaft of the second rotor 221 is connected to the counter gear 303 via the second drive shaft 302. The drive wheels 305 are connected to the counter gear 303 via the shaft 304. As a result, the rotational power of the first rotor 121 and the second rotor 221 are added together in the counter gear 303, and the added rotational power is transmitted to the drive wheels 305. The first drive shaft 301, the second drive shaft 302, and the counter gear 303 constitute the "power transmission section."

[0082] The first rotating electric machine 120 is equipped with a first stator 122. The first stator 122 is equipped with armature windings consisting of U, V, and W phase windings 123U, 123V, and 123W, which are connected in a star configuration with an electrical angle offset from each other by 120°. The second rotating electric machine 220 is equipped with a second stator 222. The second stator 222 is equipped with armature windings consisting of U, V, and W phase windings 223U, 223V, and 223W, which are connected in a star configuration with an electrical angle offset from each other by 120°.

[0083] 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 configuration as the first inverter 70 of the fourth embodiment, and the second inverter 210 has the same configuration as the second inverter 80 of the fourth embodiment. The first inverter 110 includes a first capacitor 111 which is a smoothing capacitor, and the second inverter 210 includes a second capacitor 211 which is a smoothing capacitor.

[0084] The system is equipped with a cooling device as shown in Figure 2. The circulation path 400 that constitutes the cooling device includes a first inverter 110, a second inverter 210, a first rotating electric machine 120, a second rotating electric machine 220, a first storage battery 100, and a second storage battery 200.

[0085] 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 that detects the phase currents of at least two phases flowing through the armature winding of the first rotating electric machine 120, and a second current sensor that detects the phase currents of at least two phases flowing through the armature winding of the second rotating electric machine 220. The angle sensor 53 includes a first angle sensor that detects the rotation angle (electrical angle) of the first rotor 121, and a second angle sensor that detects the rotation angle (electrical angle) of the second rotor 221. The temperature sensor 54 includes a first temperature sensor that detects the temperature of the first storage battery 100, and a second temperature sensor that detects the temperature of the second storage battery 200.

[0086] Based on the detection values ​​of each sensor 50, 51, 53, and 54, the control device 60 controls the switching of each switch constituting the first inverter 110 in order to feed back the torque of the first rotating electric machine 120 to the first command torque. The control device 60 also controls the switching of each switch constituting the second inverter 210 in order to feed back 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 wheels 305, causing the vehicle to move.

[0087] Next, the temperature rise control of the first and second batteries 100 and 200, executed by the control device 60, will be described. The temperature rise control in this embodiment is a modification of the process shown in Figure 6 above. Specifically, in step S10, the control device 60 determines that there is a temperature rise request if the lower of the detected temperatures of the first and second batteries 100 and 200 is below the target temperature Ttgt.

[0088] In step S12, if the control device 60 determines that the lower of the temperatures of the first and second batteries 100 and 200 has reached the target temperature Ttgt, it stops the temperature rise control.

[0089] Next, the process of step S11 will be explained using Figure 15. In Figure 15, the first armature current vector Ivt_A is the current vector flowing through the armature winding of the first rotating electric machine 120 in the dq coordinate system, and the second armature current vector Ivt_B is the current vector flowing through the armature winding of the second rotating electric machine 220 in the dq coordinate system.

[0090] Similar to the fourth embodiment, the control device 60 controls the switching of the first and second inverters 70 and 80 so that the magnitudes of the first armature current vector Ivt_A and the second armature current vector Ivt_B are the same, while the phase difference between the first armature current vector Ivt_A and the second armature current vector Ivt_B is 180 degrees. This control causes the second armature current vector Ivt_B to rotate at the same frequency as the first armature current vector Ivt_A, which rotates at the frequency of the three-phase AC current. As a result, the torque generated when the armature winding of the first rotating electric machine 120 is energized can be reduced by the torque generated when the armature winding of the second rotating electric machine 220 is energized. Consequently, the torque transmitted to the drive wheel 305 becomes smaller than the torque threshold Trqth.

[0091] According to the embodiment described above, the first and second storage batteries 100 and 200 can be rapidly heated up while maintaining the rotational stop state of the first and second rotors 121 and 221.

[0092] <Modified form of the fifth embodiment> Similar to the control described in the second and third embodiments, the amplitude and frequency of at least one of the d and q-axis currents flowing through the armature winding of the first rotating electric machine 120 and the d and q-axis currents flowing through the armature winding of the second rotating electric machine 220 may be gradually increased. In this case, even if an imbalance occurs in the torque generated by the first and second rotating electric machines 120 and 220 at the start of the temperature rise control, the gear meshing in the counter gear 303 can be smoothly performed while suppressing vibration and twisting of the drive shafts 301 and 302.

[0093] - In temperature rise control, the magnitudes of the first armature current vector Ivt_A and the second armature current vector Ivt_B may be different, provided that the torque output from the shaft 304 to the drive wheel 305 is less than the torque threshold Trqth.

[0094] During temperature rise control, the phase difference γ between the first armature current vector Ivt_A and the first armature current vector Ivt_B is not limited to 180 degrees, but may be the angle shown in Figure 16 above, provided that the second armature current vector Ivt_B has a component that is 180 degrees different in phase from the first armature current vector Ivt_A. Referring to Figure 16 above, the phase difference γ should be set, for example, to 90 degrees < γ < 270 degrees, preferably to 150 degrees ≤ γ ≤ 210 degrees, and more preferably to 170 degrees ≤ γ ≤ 190 degrees, provided that the torque output from the shaft 304 to the drive wheel 305 is less than the torque threshold Trqth.

[0095] The system may have M or more sets of rotating electric machines and inverters (where M is an integer of 3 or more). In this case, the control device 60 can, for example, perform switching control of each inverter so as to shift the phase of the current vectors flowing through the armature windings of each set of rotating electric machines by 360 / M degrees in the dq coordinate system.

[0096] The battery electrically connected to the first inverter 110 and the battery electrically connected to the second inverter 210 may be the same battery.

[0097] <Other Embodiments> Furthermore, each of the above embodiments may be implemented with the following modifications.

[0098] In the temperature rise control of the fourth and fifth embodiments, the phase current may contain harmonic components as shown in Figure 11.

[0099] In the first to third embodiments, the rotating electric machine is not limited to one that has only field windings as field poles, but may also have permanent magnets in addition to field windings. In this case, if the magnetic flux generated by the permanent magnets is φm, then equation (eq5) below will hold instead of equation (eq1) above.

[0100] Trq = TM + TR =P·(φf+φm)·Iq +P·(Lq-Ld)·Id·Iq …(eq5) If we set Trq=0 in equation (eq5) above, we derive equation (eq6) below.

[0101] φf = -(Lq - Ld)·Id - φm …(eq6) Equation (eq7) can be derived from equations (eq2) and (eq6) above.

[0102] If∝-(Lq-Ld)·Id / Nf-φm / Nf …(eq7) According to equation (eq7) above, the rotor 31 can be kept stationary by setting the target field current Iftgt to a field current obtained by superimposing a DC component corresponding to "-φm / Nf" on the AC field current If described in the first embodiment.

[0103] The rotating electric machine is not limited to those in which the field winding is provided on the rotor; it may also be a hybrid field flux switching motor (HEFSM) or similar, in which the field winding is provided on the stator.

[0104] The rotating electric machine is not limited to synchronous machines; it may also be an asynchronous machine such as an induction machine.

[0105] The rotating electric machine is not limited to a radial type in which the rotor and stator face each other radially, but may also be an axial type in which the rotor and stator face each other in the axial direction of the rotation shaft.

[0106] The rotating electric machine is not limited to those with a star connection; it may also be a delta connection. Furthermore, the rotating electric machine and inverter are not limited to three-phase; they may be two-phase or four-phase or more.

[0107] The target of the temperature increase control may be, for example, the cooling water in the circulation path 400. If the vehicle is equipped with an air conditioning system that uses the cooling water as a heat source for heating the vehicle interior, the temperature of the heating heat source can be rapidly increased by the temperature increase control.

[0108] The heat transfer section is not limited to those using cooling water as the cooling fluid; for example, it may be an air-cooled type using gas (air) as the cooling fluid, or it may be a metal heat sink. When a heat sink is used as the heat transfer section, for example, it is sufficient if a power converter such as an inverter and a storage battery are provided on the heat sink.

[0109] The inverter switch is not limited to an N-channel MOSFET; for example, it could be an IGBT. In this case, a freewheeling diode must be connected in antiparallel to the IGBT.

[0110] The energy storage unit connected to a power converter such as an inverter is not limited to a battery; for example, it may include a large-capacity electric double-layer capacitor, or both a battery and an electric double-layer capacitor.

[0111] The mobile device on which the control device is mounted is not limited to a vehicle; for example, it could be an aircraft or a ship. Furthermore, the mounting location of the control device is not limited to a mobile device; it could be a stationary device.

[0112] The control unit and its method described herein may be implemented by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program. Alternatively, the control unit and its method described herein may be implemented by a dedicated computer provided by configuring a processor by one or more dedicated hardware logic circuits. Alternatively, the control unit and its method described herein may be implemented by one or more dedicated computers configured by a combination of a processor and memory programmed to perform one or more functions and a processor configured by one or more hardware logic circuits. Furthermore, the computer program may be stored as instructions executed by the computer on a computer-readable non-transitional tangible recording medium.

[0113] The following describes the characteristic configurations extracted from each of the embodiments described above. [Configuration 1] Energy storage unit (10, 100, 200), Multiple power converters (20, 40, 70, 80, 110, 210) electrically connected to the aforementioned energy storage unit, A rotating electric machine (30, 90, 120, 220) having windings electrically connected to each of the aforementioned power converters, A heat transfer unit (400, 401) transfers the heat generated in at least one of the aforementioned power converters to the heating element (10, 100, 200), In a control device (60) for a power converter applied to a system comprising: A determination unit for determining whether or not there is a request to raise the temperature of the object to be heated, When the determination unit determines that a temperature increase is required, the control unit controls the switching of each power converter to supply AC d and q axis currents to the windings (32, 34U~34W, 93A, 93B, 123U~123W, 223U~223W) while maintaining the rotational stop state of the rotor (31, 91, 121, 221) of the rotating electric machine. A control device for a power converter, equipped with the following features. [Configuration 2] The rotating electric machine (30) has, as windings, a multi-phase armature winding (34U~34W) and a field winding (32), Of the aforementioned power converters, the power converter to which the armature winding is electrically connected is the first inverter (20), and the power converter to which the field winding is electrically connected is the second inverter (40). The control unit controls the switching of the first inverter and the second inverter so that the current vector flowing through the field winding in the dq coordinate system has a component that reduces the reluctance torque of the rotating electric machine, while maintaining the rotation-stopped state of the rotor (31). This is the control device for the power converter according to configuration 1. [Configuration 3] The aforementioned rotating electric machine has the characteristic that the q-axis inductance is greater than the d-axis inductance. The control unit controls the switching of the first inverter and the second inverter such that the current vector flowing through the field winding in the dq coordinate system has a component that is 180 degrees different in phase from the current vector flowing through the armature winding in the dq coordinate system, as described in configuration 2. [Structure 4] The aforementioned rotating electric machine has the characteristic that the d-axis inductance is greater than the q-axis inductance. The control unit controls the switching of the first inverter and the second inverter such that the current vector flowing through the field winding in the dq coordinate system has the same phase component as the current vector flowing through the armature winding in the dq coordinate system, as described in configuration 2. [Composition 5] The control unit performs switching control of the first inverter and the second inverter so that the torque generated by the rotating electric machine becomes less than the torque threshold (Trqth). The control device for a power converter according to any one of configurations 2 to 4, wherein the torque threshold is the torque at which the rotor begins to rotate. [Composition 6] The control device for the power converter described in any one of configurations 2 to 5, wherein the second inverter comprises two series connections of upper and lower arm switches (SH1, SL1, SH2, SL2) capable of bidirectional current flow. [Composition 7] The rotating electric machine (90) has multiple armature windings (93A, 93B) as windings, The rotor (91) is common to multiple armature windings, Each of the aforementioned power converters is an inverter (70, 80) provided individually to correspond to the armature winding of each system. The control unit controls the switching of each inverter so as to shift the phases of the current vectors flowing through the armature windings of each system relative to each other in the dq coordinate system in order to maintain the rotational stop state of the rotor, as described in Configuration 1. [Structure 8] When the number of armature winding systems is N, the control unit controls the switching of each inverter so as to shift the phase of the current vectors flowing through each armature winding system by 360 / N degrees in the dq coordinate system, as described in configuration 7, for the control device of the power converter. [Composition 9] The system comprises a plurality of rotating electric machines (120, 220) having armature windings (123U~123W, 223U~223W) as windings, Each of the aforementioned power converters is an inverter (110, 210) provided individually in accordance with the armature winding of each of the aforementioned rotating electric machines. The system includes power transmission units (301-303) that transmit power between the rotors (121, 221) of each of the rotating electric machines. The control unit controls the switching of each inverter so as to shift the phases of the current vectors flowing through the armature windings of each rotating electric machine relative to each other in the dq coordinate system in order to maintain the rotational stop state of the rotor, as described in Configuration 1. [Configuration 10] When the number of the rotating electric machines is N, the control unit controls the switching of each inverter so as to shift the phase of the current vector flowing through the armature winding of each rotating electric machine by 360 / N degrees in the dq coordinate system, as described in configuration 9, for the control device of the power converter. [Composition 11] A control device for a power converter according to any one of configurations 1 to 10, wherein the control unit starts supplying d,q axis currents to the windings when the determination unit determines that there is a request for temperature increase, and controls the switching of each power converter so as to gradually increase at least one of the amplitude and frequency of the d,q axis currents supplied to the windings. [Composition 12] The system is a control device for a power converter according to any one of configurations 1 to 11, mounted on a vehicle equipped with drive wheels (12,305) that rotate when rotational power from the rotor is transmitted to them. [Composition 13] Energy storage unit (10, 100, 200), Multiple power converters (20, 40, 70, 80, 110, 210) electrically connected to the aforementioned energy storage unit, A rotating electric machine (30, 90, 120, 220) having windings electrically connected to each of the aforementioned power converters, A heat transfer unit (400, 401) transfers the heat generated in at least one of the aforementioned power converters to the heating element (10, 100, 200), Computer (61) and, In a program applied to a system that includes the following features, The aforementioned computer, A determination unit for determining whether or not there is a request to raise the temperature of the object to be heated, When the determination unit determines that a temperature increase is required, the control unit controls the switching of each power converter to supply AC d and q axis currents to the windings (32, 34U~34W, 93A, 93B, 123U~123W, 223U~223W) while maintaining the rotational stop state of the rotor (31, 91, 121, 221) of the rotating electric machine. A program that makes something work.

[0114] This disclosure is described in accordance with the embodiments, but it is understood that this disclosure is not limited to such embodiments or structures. This disclosure also includes various modifications and variations within the equivalence. In addition, various combinations and forms, as well as other combinations and forms that include only one, more, or fewer of those elements, fall within the scope and concept of this disclosure.

Claims

1. Energy storage unit (10), Multiple power converters (20, 40) electrically connected to the aforementioned energy storage unit, A rotating electric machine (30) having windings electrically connected to each of the aforementioned power converters, A heat transfer unit (400, 401) transfers the heat generated in at least one of the power converters to the object to be heated (10), In a control device (60) for a power converter applied to a system comprising: A determination unit for determining whether or not there is a request to raise the temperature of the object to be heated, When the determination unit determines that there is a request for temperature increase, the control unit controls the switching of each power converter so as to allow AC d and q axis currents to flow through the windings while maintaining the rotational stop state of the rotor (31) of the rotating electric machine, Equipped with, The aforementioned rotating electric machine has, as windings, a multi-phase armature winding (34U to 34W) and a field winding (32). Of the aforementioned power converters, the power converter to which the armature winding is electrically connected is the first inverter (20), and the power converter to which the field winding is electrically connected is the second inverter (40). The control unit controls the switching of the first inverter and the second inverter so that the current vector flowing through the field winding in the dq coordinate system has a component that reduces the reluctance torque of the rotating electric machine, while maintaining the rotational stop state of the rotor.

2. The aforementioned rotating electric machine has the characteristic that the q-axis inductance is greater than the d-axis inductance. The control unit controls the switching of the first inverter and the second inverter such that the current vector flowing through the field winding in the dq coordinate system has a component that is 180 degrees different in phase from the current vector flowing through the armature winding in the dq coordinate system, as described in claim 1.

3. The aforementioned rotating electric machine has the characteristic that the d-axis inductance is greater than the q-axis inductance. The control unit controls the switching of the first inverter and the second inverter such that the current vector flowing through the field winding in the dq coordinate system has the same component as the phase of the current vector flowing through the armature winding in the dq coordinate system, as described in claim 1.

4. The control unit controls the switching of the first inverter and the second inverter so that the torque generated by the rotating electric machine becomes less than the torque threshold (Trqth). The control device for a power converter according to any one of claims 1 to 3, wherein the torque threshold is the torque at which the rotor begins to rotate.

5. The control device for a power converter according to claim 1, wherein the second inverter comprises two sets of series connections of upper and lower arm switches (SH1, SL1, SH2, SL2) capable of bidirectional current flow.

6. Energy storage unit (100, 200) and Multiple power converters (110, 210) electrically connected to the energy storage unit, A rotating electric machine (120, 220) having windings electrically connected to each of the aforementioned power converters, A heat transfer unit (400, 401) transfers the heat generated in at least one of the aforementioned power converters to the object to be heated (100, 200), In a control device (60) for a power converter applied to a system comprising: A determination unit for determining whether or not there is a request to raise the temperature of the object to be heated, When the determination unit determines that a temperature increase is required, the control unit controls the switching of each power converter so as to allow alternating d and q axis currents to flow through the windings while maintaining the rotational stop state of the rotors (121, 221) of the rotating electric machine. Equipped with, The system comprises a plurality of the rotating electric machines, each having an armature winding (123U to 123W, 223U to 223W) as the winding. Each of the power converters is an inverter (110, 210) provided individually in accordance with the armature winding of each of the rotating electric machines. The system includes power transmission units (301-303) that transmit power between the rotors of each of the rotating electric machines. A control device for a power converter, wherein, when the number of the rotating electric machines is N, the control unit controls the switching of each inverter so as to shift the phase of the current vector flowing through the armature winding of each rotating electric machine by 360 / N degrees in the dq coordinate system in order to maintain the rotational stop state of the rotor.

7. The control unit controls the switching of each power converter so as to start supplying d and q-axis currents to the windings when the determination unit determines that there is a request for temperature increase, and to gradually increase at least one of the amplitude and frequency of the d and q-axis currents supplied to the windings, as described in any one of claims 1 to 3, 5, or 6.

8. The control device for a power converter according to any one of claims 1 to 3, 5, or 6, which is mounted on a vehicle equipped with drive wheels (12, 305) that rotate when rotational power from the rotor is transmitted to them.

9. Energy storage unit (10), Multiple power converters (20, 40) electrically connected to the aforementioned energy storage unit, A rotating electric machine (30) having windings electrically connected to each of the aforementioned power converters, A heat transfer unit (400, 401) transfers the heat generated in at least one of the power converters to the object to be heated (10), Computer (61) and, In a program applied to a system that includes the following features, To the aforementioned computer, A process to determine whether or not there is a request to raise the temperature of the aforementioned temperature-raising target, When it is determined that there is a request for temperature increase, a control process is performed to control the switching of each power converter so as to allow AC d and q axis currents to flow through the windings (32, 34U to 34W, 93A, 93B, 123U to 123W, 223U to 223W) while maintaining the rotational stop state of the rotor (31, 91, 121, 221) of the rotating electric machine. Make it run, The aforementioned rotating electric machine has, as windings, a multi-phase armature winding (34U to 34W) and a field winding (32). Of the aforementioned power converters, the power converter to which the armature winding is electrically connected is the first inverter (20), and the power converter to which the field winding is electrically connected is the second inverter (40). The control process is a program that controls the switching of the first inverter and the second inverter so that the current vector flowing through the field winding in the dq coordinate system has a component that reduces the reluctance torque of the rotating electric machine, while maintaining the rotational stop state of the rotor.

10. Energy storage unit (10), Multiple power converters (20, 40) electrically connected to the aforementioned energy storage unit, A rotating electric machine (30) having windings electrically connected to each of the aforementioned power converters, A heat transfer unit (400, 401) transfers the heat generated in at least one of the power converters to the object to be heated (10), Computer (61) and, In a control method applied to a system comprising the following: To the aforementioned computer, A process to determine whether or not there is a request to raise the temperature of the aforementioned temperature-raising target, When it is determined that there is a request for temperature increase, a control process is performed to control the switching of each power converter so as to allow AC d and q axis currents to flow through the windings (32, 34U to 34W, 93A, 93B, 123U to 123W, 223U to 223W) while maintaining the rotational stop state of the rotor (31, 91, 121, 221) of the rotating electric machine. Make it run, The aforementioned rotating electric machine has, as windings, a multi-phase armature winding (34U to 34W) and a field winding (32). Of the aforementioned power converters, the power converter to which the armature winding is electrically connected is the first inverter (20), and the power converter to which the field winding is electrically connected is the second inverter (40). The control process is a control method which involves switching control of the first inverter and the second inverter such that, while maintaining the rotation-stopped state of the rotor, the current vector flowing through the field winding in the dq coordinate system has a component that reduces the reluctance torque of the rotating electric machine.

11. Energy storage unit (100, 200), Multiple power converters (110, 210) electrically connected to the energy storage unit, A rotating electric machine (120, 220) having windings electrically connected to each of the aforementioned power converters, A heat transfer unit (400, 401) transfers the heat generated in at least one of the aforementioned power converters to the object to be heated (100, 200), Computer (61) and, In a program applied to a system that includes the following features, To the aforementioned computer, A process to determine whether or not there is a request to raise the temperature of the aforementioned temperature-raising target, When it is determined that there is a request for temperature increase, a control process is performed to control the switching of each power converter so as to allow AC d and q axis currents to flow through the windings while maintaining the rotational stop state of the rotors (121, 221) of the rotating electric machine. Make it run, The system comprises a plurality of the rotating electric machines, each having an armature winding (123U to 123W, 223U to 223W) as the winding. Each of the power converters is an inverter (110, 210) provided individually in accordance with the armature winding of each of the rotating electric machines. The system includes power transmission units (301-303) that transmit power between the rotors of each of the rotating electric machines. A program that, when the number of the rotating electric machines is N, controls the switching of each inverter in the control process such that the phase of the current vector flowing through the armature winding of each rotating electric machine is shifted by "360 / N" degrees in the dq coordinate system in order to maintain the rotational stop state of the rotor.

12. A power storage unit (100, 200), Multiple power converters (110, 210) electrically connected to the energy storage unit, A rotating electric machine (120, 220) having windings electrically connected to each of the aforementioned power converters, A heat transfer unit (400, 401) transfers the heat generated in at least one of the aforementioned power converters to the object to be heated (100, 200), Computer (61) and, In a control method applied to a system comprising the following: To the aforementioned computer, A process to determine whether or not there is a request to raise the temperature of the aforementioned temperature-raising target, When it is determined that there is a request for temperature increase, a control process is performed to control the switching of each power converter so as to allow AC d and q axis currents to flow through the windings while maintaining the rotational stop state of the rotors (121, 221) of the rotating electric machine. Make it run, The system comprises a plurality of the rotating electric machines, each having an armature winding (123U to 123W, 223U to 223W) as the winding. Each of the power converters is an inverter (110, 210) provided individually in accordance with the armature winding of each of the rotating electric machines. The system includes power transmission units (301-303) that transmit power between the rotors of each of the rotating electric machines. A control method in which, when the number of the rotating electric machines is N, the switching control of each inverter is performed in the control process such that the phase of the current vector flowing through the armature winding of each rotating electric machine is shifted by "360 / N" degrees in the dq coordinate system in order to maintain the rotational stop state of the rotor.

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