Electrical power supply system, method for controlling the same, moving object

Abstract

The invention provides an electric power supply system, a control method thereof, a moving object, and a computer program product. When DC power supply from a first power generation device (14a) to a first electric power supply circuit (18a) is cut off, a control device (30) performs first electric power suppression control on a first inverter (15a) and performs first electric power increase control on a second inverter (15b). The first electric power suppression control is to control the electric power supplied from the first inverter to the first motor (17a) to be smaller than the electric power supplied from the first power generation device to the first electric power supply circuit before the DC power supply is cut off. The first electric power increase control is to control the electric power supplied from the second inverter to the first motor to be greater than the DC power supply from the first power generation device to the first electric power supply circuit before the cut-off. Therefore, when the DC power supply from the first power generation device to the first electric power supply circuit is cut off, the output torque of the first motor can be prevented from being reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to an electric power supply system, a control method thereof, a mobile body, and a computer program product. BACKGROUND

[0002] An aircraft electric power supply network (electric power supply system) is disclosed in Japanese Patent Application Publication No. JP 2019-506692 A. SUMMARY

[0003] A better electric power supply system, a mobile body having a better electric power supply system, a control method of a better electric power supply system, and a computer program product for causing a computer to execute a control method of a better electric power supply system are desired.

[0004] An object of the present application is to solve the above-described technical problem.

[0005] A first aspect of the present application is an electric power supply system having a first electric power supply circuit, a first electric storage device, a second electric power supply circuit, a second electric storage device, a first electric motor, and a control device, wherein the first electric power supply circuit supplies direct-current electric power output from a first electric power generator to a first inverter; the first electric storage device is connected in parallel to the first electric power generator at the first electric power supply circuit; the second electric power supply circuit supplies direct-current electric power output from a second electric power generator to a second inverter; the second electric storage device is connected in parallel to the second electric power generator at the second electric power supply circuit; the first electric motor is a double-winding three-phase electric motor that can be driven by electric power converted to alternating-current electric power by the first inverter and can be driven by electric power converted to alternating-current electric power by the second inverter; and the control device controls the first inverter and the second inverter, and in a case where direct-current electric power supply from the first electric power generator to the first electric power supply circuit is cut off, the control device performs first electric power suppression control on the first inverter and first electric power increase control on the second inverter, wherein the first electric power suppression control is control of a first ratio of a proportion of first electric power supplied from the first inverter to the first electric motor with respect to power consumption of the first electric motor to be smaller than before direct-current electric power supply from the first electric power generator to the first electric power supply circuit is cut off, and the first electric power increase control is control of a second ratio of a proportion of second electric power supplied from the second inverter to the first electric motor with respect to power consumption of the first electric motor to be larger than before direct-current electric power supply from the first electric power generator to the first electric power supply circuit is cut off.

[0006] A second aspect of the application is a mobile body having the electric power supply system of the first aspect.

[0007] A third aspect of the application is a control method of an electric power supply system having a first electric power supply circuit, a first electric storage device, a second electric power supply circuit, a second electric storage device, and a first electric motor, wherein the first electric power supply circuit supplies direct-current electric power output from a first power generation device to a first inverter; the first electric storage device is connected in parallel to the first power generation device to the first electric power supply circuit; the second electric power supply circuit supplies direct-current electric power output from a second power generation device to a second inverter; the second electric storage device is connected in parallel to the second power generation device to the second electric power supply circuit; the first electric motor is a double-winding three-phase electric motor that can be driven by electric power converted to alternating-current electric power by the first inverter and can be driven by electric power converted to alternating-current electric power by the second inverter, and in a case where direct-current electric power supply from the first power generation device to the first electric power supply circuit is cut off, first electric power suppression control is executed on the first inverter and first electric power increase control is executed on the second inverter, wherein the first electric power suppression control refers to control of a first ratio of a first electric power supplied from the first inverter to the first electric motor with respect to power consumption of the first electric motor to be smaller than before direct-current electric power supply from the first power generation device to the first electric power supply circuit is cut off, and the first electric power increase control refers to control of a second ratio of a second electric power supplied from the second inverter to the first electric motor with respect to power consumption of the first electric motor to be larger than before direct-current electric power supply from the first power generation device to the first electric power supply circuit is cut off.

[0008] A fourth aspect of the application is a computer program product for causing a computer to execute the control method of the electric power supply system of the third aspect.

[0009] According to the present application, it is possible to provide a better electric power supply system, a mobile body having a better electric power supply system, a better control method of an electric power supply system, and a computer program product for causing a computer to execute a better control method of an electric power supply system.

[0010] The above objects, features, and advantages will be more apparent from the following description of embodiments taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a schematic view of an electric power supply system in an embodiment.

[0012] Figure 2 is a graph showing the operation of the electric power supply system at the time of normality in one embodiment.

[0013] Figure 3 is a graph showing the operation of the electric power supply system at the time of abnormality in one embodiment.

[0014] Figure 4 is a graph showing the operation of the electric power supply system at the time of abnormality in one embodiment.

[0015] Figure 5 is a graph showing the operation of the electric power supply system at the time of abnormality in one embodiment.

[0016] Figure 6 is a control block diagram of the control device in one embodiment.

[0017] Figure 7 is a flowchart showing a fail-safe control in one embodiment.

[0018] Figures 8A-8C is a graph showing the state of the electric power supply system over time during a period before and after the time of connection of the first electric power supply system and the second electric power supply system.

[0019] Figures 9A-9C is a graph showing the state of the electric power supply system over time during a period before and after the time of connection of the first electric power supply system and the second electric power supply system.

[0020] Figure 10 is a schematic diagram of the electric power supply system in a comparative example. DETAILED DESCRIPTION

[0021] In the related art, as an electric power supply system mounted on an electric vertical takeoff and landing aircraft (eVTOL), an electric power supply system having two electric power supply systems, a first electric power supply system and a second electric power supply system, is proposed.

[0022] The first electric power supply system is a system that supplies electric power to a first electric motor, and has a first power generation device as a main power source, a first power storage device as an auxiliary power source, and a first electric power supply circuit that supplies electric power from the first power generation device to the first electric motor. The second electric power supply system is a system that supplies electric power to a second electric motor, and has a second power generation device as a main power source, a second power storage device as an auxiliary power source, and a second electric power supply circuit that supplies electric power from the second power generation device to the second load device. The first electric motor and the second electric motor are each an electric motor that drives a VTOL rotor mounted on the eVTOL.

[0023] In a case where the state where the electric power cannot be supplied from the first power generation device to the first electric power supply circuit is reached, the first motor needs to be driven using only the electric power of the first electric storage device. Therefore, in the conventional electric power supply system, the output torque of the first motor is suppressed, and the driving time of the first motor is as long as possible. In addition, the output torque is increased in the second motor, and the portion where the output torque of the first motor is suppressed is supplemented, and thus the lift thrust of the eVTOL as a whole is ensured.

[0024] However, in the conventional electric power supply system, even if the lift thrust of the eVTOL as a whole is ensured, it is difficult to maintain the balance of the VTOL rotor lift thrust, and it is possible to cause the attitude of the body to be difficult to maintain.

[0025] In the present application, even in a case where the state where the electric power cannot be supplied from the first power generation device to the first electric power supply circuit is reached, the output torque of the first motor can be ensured. Hereinafter, an electric power supply system of the present application, a mobile body having the electric power supply system, a control method of the electric power supply system, and a computer program product for causing a computer to execute the control method of the electric power supply system will be described.

[0026] [One embodiment] [Structure of electric power supply system] Figure 1 FIG. 1 is a schematic view of an electric power supply system 10 in one embodiment. The electric power supply system 10 includes a first electric power supply system 12a and a second electric power supply system 12b. The first electric power supply system 12a includes a first power generation device 14a as a main power source, a first electric storage device 16a and a third electric storage device 16c as auxiliary power sources. The second electric power supply system 12b includes a second power generation device 14b as a main power source, a second electric storage device 16b and a fourth electric storage device 16d as auxiliary power sources.

[0027] The first electric power supply system 12a includes a first electric power supply circuit 18a and a third electric power supply circuit 18c. The first electric power supply circuit 18a supplies the direct-current electric power output from the first power generation device 14a to a first inverter 15a and a third inverter 15c. The third electric power supply circuit 18c supplies the direct-current electric power output from the first power generation device 14a to a fifth inverter 15e and a seventh inverter 15g.

[0028] The 2nd electric power supply system 12b includes a 2nd electric power supply circuit 18b and a 4th electric power supply circuit 18d. The 2nd electric power supply circuit 18b supplies the direct current electric power output from the 2nd electric power generation device 14b to the 2nd inverter 15b and the 4th inverter 15d. The 4th electric power supply circuit 18d supplies the direct current electric power output from the 2nd electric power generation device 14b to the 6th inverter 15f and the 8th inverter 15h.

[0029] The 1st electric power generation device 14a and the 2nd electric power generation device 14b have an engine, a generator, and a power control unit, which are not shown. The generator is driven by the engine, and generates three-phase alternating current electric power. The power control unit converts the three-phase alternating current electric power into direct current.

[0030] The 1st electric power generation device 14a and the 2nd electric power generation device 14b can also have various sensors such as a voltage sensor, a current sensor, and the like, a fuse, a relay, a circuit breaker, a diode, a transistor, a resistor, a coil, a capacitor, and the like.

[0031] The 1st inverter 15a converts the input direct current electric power into three-phase alternating current electric power and outputs to the 1st electric motor 17a. The 2nd inverter 15b converts the input direct current electric power into three-phase alternating current electric power and outputs to the 1st electric motor 17a. The 3rd inverter 15c converts the input direct current electric power into three-phase alternating current electric power and outputs to the 2nd electric motor 17b. The 4th inverter 15d converts the input direct current electric power into three-phase alternating current electric power and outputs to the 2nd electric motor 17b. The 5th inverter 15e converts the input direct current electric power into three-phase alternating current electric power and outputs to the 3rd electric motor 17c. The 6th inverter 15f converts the input direct current electric power into three-phase alternating current electric power and outputs to the 3rd electric motor 17c. The 7th inverter 15g converts the input direct current electric power into three-phase alternating current electric power and outputs to the 4th electric motor 17d. The 8th inverter 15h converts the input direct current electric power into three-phase alternating current electric power and outputs to the 4th electric motor 17d.

[0032] The 1st electric motor 17a, the 2nd electric motor 17b, the 3rd electric motor 17c, and the 4th electric motor 17d are all double-winding three-phase electric motors.

[0033] The electric power supply system 10 includes a 1st connection circuit 22a and a 2nd connection circuit 22b. In the 1st connection circuit 22a, there is a 1st connection device 24a capable of connecting the 1st electric power supply circuit 18a and the 2nd electric power supply circuit 18b. In the 2nd connection circuit 22b, there is a 2nd connection device 24b capable of connecting the 3rd electric power supply circuit 18c and the 4th electric power supply circuit 18d.

[0034] The first connection device 24a and the second connection device 24b have contactors. The first connection device 24a and the second connection device 24b can also have relays. The first connection device 24a and the second connection device 24b can further have circuit breakers. The first connection device 24a and the second connection device 24b can also have semiconductor switches.

[0035] Generally, the first electric power supply circuit 18a and the second electric power supply circuit 18b are disconnected by the first connection device 24a, and the third electric power supply circuit 18c and the fourth electric power supply circuit 18d are disconnected by the second connection device 24b. That is, the first electric power supply system 12a is not connected to the second electric power supply system 12b. Accordingly, in the case where an abnormality occurs in one of the first electric power supply system 12a and the second electric power supply system 12b, it is possible to prevent the abnormality from affecting the other. For example, even if a short circuit occurs in the first electric power supply system 12a, resulting in a state where electric power cannot be supplied from the first electric power supply system 12a to each of the first motor 17a, the second motor 17b, the third motor 17c, and the fourth motor 17d, each of the first motor 17a, the second motor 17b, the third motor 17c, and the fourth motor 17d can continue to be driven by electric power supplied from the second electric power supply system 12b.

[0036] In the case where the direct-current electric power supply from the first power generation device 14a to the first electric power supply circuit 18a and the third electric power supply circuit 18c is cut off, the first electric power supply circuit 18a and the second electric power supply circuit 18b are connected by the first connection device 24a. In addition, the third electric power supply circuit 18c and the fourth electric power supply circuit 18d are connected by the second connection device 24b. Accordingly, electric power is supplied from the second power generation device 14b to the first electric power supply circuit 18a and the third electric power supply circuit 18c.

[0037] In the case where the direct-current electric power supply from the second power generation device 14b to the second electric power supply circuit 18b and the fourth electric power supply circuit 18d is cut off, the first electric power supply circuit 18a and the second electric power supply circuit 18b are connected by the first connection device 24a. In addition, the third electric power supply circuit 18c and the fourth electric power supply circuit 18d are connected by the second connection device 24b. Accordingly, electric power is supplied from the first power generation device 14a to the second electric power supply circuit 18b and the fourth electric power supply circuit 18d.

[0038] The electric power supply system 10 includes disconnection devices 26a to 26d. The disconnection device 26a is capable of disconnecting the first power generation device 14a from the first electric power supply circuit 18a and the first connection circuit 22a. The disconnection device 26b is capable of disconnecting the second power generation device 14b from the second electric power supply circuit 18b and the first connection circuit 22a. The disconnection device 26c is capable of disconnecting the first power generation device 14a from the third electric power supply circuit 18c and the second connection circuit 22b. The disconnection device 26d is capable of disconnecting the second power generation device 14b from the fourth electric power supply circuit 18d and the second connection circuit 22b.

[0039] The disconnection devices 26a to 26d have contactors. The disconnection devices 26a to 26d can also have relays. The disconnection devices 26a to 26d can also have circuit breakers. The disconnection devices 26a to 26d can also have semiconductor switches.

[0040] The first electric power supply circuit 18a is connected to the first power generation device 14a and the first storage device 16a in parallel. The second electric power supply circuit 18b is connected to the second power generation device 14b and the second storage device 16b in parallel. The third electric power supply circuit 18c is connected to the first power generation device 14a and the third storage device 16c in parallel. The fourth electric power supply circuit 18d is connected to the second power generation device 14b and the fourth storage device 16d in parallel.

[0041] The first storage device 16a, the second storage device 16b, the third storage device 16c, and the fourth storage device 16d have lithium ion batteries. The first storage device 16a, the second storage device 16b, the third storage device 16c, and the fourth storage device 16d can also have secondary batteries other than lithium ion batteries. The first storage device 16a, the second storage device 16b, the third storage device 16c, and the fourth storage device 16d can also have large-capacity capacitors.

[0042] The first storage device 16a, the second storage device 16b, the third storage device 16c, and the fourth storage device 16d can also have various sensors such as voltage sensors and current sensors, fuses, relays, circuit breakers, diodes, transistors, resistors, coils, capacitors, and the like.

[0043] The electric power supply system 10 includes disconnection devices 28a to 28d. The disconnection device 28a is capable of disconnecting the first electric storage device 16a from the first electric power supply circuit 18a, the first inverter 15a, and the third inverter 15c. The disconnection device 28b is capable of disconnecting the second electric storage device 16b from the second electric power supply circuit 18b, the second inverter 15b, and the fourth inverter 15d. The disconnection device 28c is capable of disconnecting the third electric storage device 16c from the third electric power supply circuit 18c, the fifth inverter 15e, and the seventh inverter 15g. The disconnection device 28d is capable of disconnecting the fourth electric storage device 16d from the fourth electric power supply circuit 18d, the sixth inverter 15f, and the eighth inverter 15h.

[0044] The disconnection devices 28a to 28d have contactors. The disconnection devices 28a to 28d can also have relays. The disconnection devices 28a to 28d can also have circuit breakers. The disconnection devices 28a to 28d can also have semiconductor switches.

[0045] As shown in FIG. 1, the first electric power supply system 12a includes the first electric power supply circuit 18a, the first inverter 15a, the third inverter 15c, the first electric storage device 16a, and the third electric storage device 16c. The first electric power supply circuit 18a is connected to the first inverter 15a and the third inverter 15c. The first inverter 15a is connected to the first electric storage device 16a. The third inverter 15c is connected to the third electric storage device 16c. The first electric power supply circuit 18a, the first inverter 15a, the third inverter 15c, the first electric storage device 16a, and the third electric storage device 16c are connected to each other via the disconnection devices 26a, 26c, and 28a, 28c. Figure 1 As shown in FIG. 1, the first electric power supply system 12a includes the first electric power supply circuit 18a, the first inverter 15a, the third inverter 15c, the first electric storage device 16a, and the third electric storage device 16c. The first electric power supply circuit 18a is connected to the first inverter 15a and the third inverter 15c. The first inverter 15a is connected to the first electric storage device 16a. The third inverter 15c is connected to the third electric storage device 16c. The first electric power supply circuit 18a, the first inverter 15a, the third inverter 15c, the first electric storage device 16a, and the third electric storage device 16c are connected to each other via the disconnection devices 26a, 26c, and 28a, 28c.

[0046] Also, in a case where the disconnecting devices 26b, 26d, the disconnecting devices 28b, 28d are in the connected state, the 2nd power generation device 14b, the 2nd power storage device 16b, the 2nd inverter 15b, the 4th inverter 15d, the 4th power storage device 16d, the 6th inverter 15f, and the 8th inverter 15h are connected to each other. Therefore, the output voltage of the 2nd power generation device 14b, the output voltage of the 2nd power storage device 16b, the applied voltage of the 2nd inverter 15b, the applied voltage of the 4th inverter 15d, the output voltage of the 4th power storage device 16d, the applied voltage of the 6th inverter 15f, and the applied voltage of the 8th inverter 15h are substantially equal. Hereinafter, the output voltage of the 2nd power generation device 14b, the output voltage of the 2nd power storage device 16b, the applied voltage of the 2nd inverter 15b, the applied voltage of the 4th inverter 15d, the output voltage of the 4th power storage device 16d, the applied voltage of the 6th inverter 15f, and the applied voltage of the 8th inverter 15h are sometimes collectively referred to as the voltage of the 2nd electric power supply system 12b.

[0047] [Operation of electric power supply system at normal time] Figure 2 is a view that shows the operation of the electric power supply system 10 at normal time in an embodiment. Figure 2 The arrows shown in the view indicate the supply path of electric power.

[0048] The connection between the 1st electric power supply circuit 18a and the 2nd electric power supply circuit 18b is disconnected by the 1st connecting device 24a. The connection between the 3rd electric power supply circuit 18c and the 4th electric power supply circuit 18d is disconnected by the 2nd connecting device 24b.

[0049] The 1st power generation device 14a is connected to the 1st electric power supply circuit 18a and the 1st connecting circuit 22a by the disconnecting device 26a. Accordingly, direct-current electric power is supplied from the 1st power generation device 14a to the 1st inverter 15a and the 3rd inverter 15c. The 1st power generation device 14a is connected to the 3rd electric power supply circuit 18c and the 2nd connecting circuit 22b by the disconnecting device 26c. Accordingly, electric power is supplied from the 1st power generation device 14a to the 5th inverter 15e and the 7th inverter 15g.

[0050] The 1st power storage device 16a is connected to the 1st inverter 15a and the 3rd inverter 15c by the disconnecting device 28a. Accordingly, direct-current electric power is supplied from the 1st power storage device 16a to the 1st inverter 15a and the 3rd inverter 15c. The 3rd power storage device 16c is connected to the 5th inverter 15e and the 7th inverter 15g by the disconnecting device 28c. Accordingly, direct-current electric power is supplied from the 3rd power storage device 16c to the 5th inverter 15e and the 7th inverter 15g.

[0051] The 2nd power generating device 14b is connected to the 2nd electric power supply circuit 18b and the 1st connecting circuit 22a by the disconnection device 26b. Accordingly, direct current electric power is supplied from the 2nd power generating device 14b to the 2nd inverter 15b and the 4th inverter 15d. The 2nd power generating device 14b is connected to the 4th electric power supply circuit 18d and the 2nd connecting circuit 22b by the disconnection device 26d. Accordingly, direct current electric power is supplied from the 2nd power generating device 14b to the 6th inverter 15f and the 8th inverter 15h.

[0052] The 2nd electric storage device 16b is connected to the 2nd inverter 15b and the 4th inverter 15d by the disconnection device 28b. Accordingly, direct current electric power is supplied from the 2nd electric storage device 16b to the 2nd inverter 15b and the 4th inverter 15d. The 4th electric storage device 16d is connected to the 6th inverter 15f and the 8th inverter 15h by the disconnection device 28d. Accordingly, direct current electric power is supplied from the 4th electric storage device 16d to the 6th inverter 15f and the 8th inverter 15h.

[0053] [Action of electric power supply system at the time of abnormality] Figures 3-5 is a view showing the action of the electric power supply system 10 at the time of abnormality in an embodiment. Figures 3-5 The arrows shown in the view indicate the supply paths of electric power. Figures 3-5 The action of the electric power supply system 10 at the time when the direct current electric power supply from the 1st power generating device 14a to the 1st electric power supply circuit 18a and the 3rd electric power supply circuit 18c is cut off is shown.

[0054] The state in which the direct current electric power supply from the 1st power generating device 14a to the 1st electric power supply circuit 18a and the 3rd electric power supply circuit 18c is cut off refers to, for example, a state in which the 1st power generating device 14a is stopped and the 1st power generating device 14a cannot be restarted. In addition, the state in which the direct current electric power supply from the 1st power generating device 14a to the 1st electric power supply circuit 18a and the 3rd electric power supply circuit 18c is cut off refers to, for example, a state in which a disconnection or the like occurs between the 1st power generating device 14a and the disconnection device 26a and between the 1st power generating device 14a and the disconnection device 26c. In addition, the state in which the direct current electric power supply from the 1st power generating device 14a to the 1st electric power supply circuit 18a and the 3rd electric power supply circuit 18c is cut off refers to, for example, a state in which a short circuit or the like occurs between the 1st power generating device 14a and the disconnection device 26a or between the 1st power generating device 14a and the disconnection device 26c.

[0055] In the case where the direct current electric power supply from the 1st power generating device 14a to the 1st electric power supply circuit 18a and the 3rd electric power supply circuit 18c is cut off, as shown in Figure 3As shown, the first power generating device 14a is disconnected from the first electric power supply circuit 18a and the first connection circuit 22a by the disconnection device 26a. In addition, the first power generating device 14a is disconnected from the third electric power supply circuit 18c and the second connection circuit 22b by the disconnection device 26c.

[0056] In a case where there is a difference between the voltage of the first electric power supply system 12a and the voltage of the second electric power supply system 12b, as shown in FIG. 6, the electric power supply system 10 of one embodiment performs the first electric power increase control on the second inverter 15b. In addition, the electric power supply system 10 performs the second electric power increase control on the fourth inverter 15d. Furthermore, the electric power supply system 10 performs the third electric power increase control on the sixth inverter 15f. In addition, the electric power supply system 10 performs the fourth electric power increase control on the eighth inverter 15h. Figure 4

[0057] In a case where there is a difference between the voltage of the first electric power supply system 12a and the voltage of the second electric power supply system 12b, as shown in FIG. 6, the electric power supply system 10 of one embodiment performs the first electric power increase control on the second inverter 15b. In addition, the electric power supply system 10 performs the second electric power increase control on the fourth inverter 15d. Furthermore, the electric power supply system 10 performs the third electric power increase control on the sixth inverter 15f. In addition, the electric power supply system 10 performs the fourth electric power increase control on the eighth inverter 15h. Figure 4

[0058] The above-described each electric power increase control is performed so that the voltage of the first electric power supply system 12a and the voltage of the second electric power supply system 12b are approximated. The approximation of the voltage of the first electric power supply system 12a and the voltage of the second electric power supply system 12b is described in detail later.

[0059] Figure 5 As shown in FIG. 6, after the voltage of the first electric power supply system 12a and the voltage of the second electric power supply system 12b are approximated, the electric power supply system 10 of one embodiment performs the connection control on the first connection device 24a. Accordingly, the first electric power supply circuit 18a and the second electric power supply circuit 18b are connected through the first connection device 24a. Thus, the direct-current electric power is supplied from the second power generating device 14b to the first electric power supply circuit 18a. In addition, the electric power supply system 10 performs the connection control on the second connection device 24b. Accordingly, the third electric power supply circuit 18c and the fourth electric power supply circuit 18d are connected through the second connection device 24b. Thus, the direct-current electric power is supplied from the second power generating device 14b to the third electric power supply circuit 18c.

[0060] [Structure of Control Device]​​​ The electric power supply system 10 has a control device 30. Figure 6 Fig. 1 is a control block diagram of the control device 30 in an embodiment.

[0061] The control device 30 has an arithmetic unit 32 and a storage unit 34. The arithmetic unit 32 is, for example, a processor such as a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), or the like. The arithmetic unit 32 controls each device by executing a program stored in the storage unit 34. At least a part of the arithmetic unit 32 can also be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or the like. At least a part of the arithmetic unit 32 can also be realized by an electronic circuit including discrete devices.

[0062] The storage unit 34 is constituted by a not-illustrated volatile memory and a not-illustrated non-volatile memory as a computer-readable storage medium. The volatile memory is, for example, a RAM (Random Access Memory) or the like. The non-volatile memory is, for example, a ROM (Read Only Memory), a flash memory, or the like. Data and the like are stored in the volatile memory, for example. Programs, tables, maps, and the like are stored in the non-volatile memory, for example. At least a part of the storage unit 34 can also be provided to the above-described processor, integrated circuit, or the like.

[0063] The control device 30 controls each of the first inverter 15a, the second inverter 15b, the third inverter 15c, the fourth inverter 15d, the fifth inverter 15e, the sixth inverter 15f, the seventh inverter 15g, and the eighth inverter 15h. In addition, the control device 30 controls each of the first connecting device 24a, the second connecting device 24b, the disconnecting devices 26a to 26d, and the disconnecting devices 28a to 28d. The control device 30 can also be provided in plural. For example, one control device 30 can control each of the first inverter 15a, the second inverter 15b, the third inverter 15c, the fourth inverter 15d, the fifth inverter 15e, the sixth inverter 15f, the seventh inverter 15g, and the eighth inverter 15h. In addition, another control device 30 can control each of the first connecting device 24a, the second connecting device 24b, the disconnecting devices 26a to 26d, and the disconnecting devices 28a to 28d.

[0064] [Fail-safe control] Figure 7 This is a flowchart illustrating a fail-safe control implementation. The fail-safe control is executed repeatedly at a predetermined cycle.

[0065] In step S1, the control device 30 determines whether the DC power supply from the first power generation device 14a to the first power supply circuit 18a and the third power supply circuit 18c has been cut off. If it is determined that the DC power supply from the first power generation device 14a to the first power supply circuit 18a and the third power supply circuit 18c has been cut off (step S1: Yes), the process proceeds to step S2.

[0066] In step S2, the control device 30 controls the disconnection device 26a to disconnect the first power generation device 14a from the first power supply circuit 18a and the first connection circuit 22a. After this, the process proceeds to step S3.

[0067] In step S3, the control device 30 controls the disconnection device 26c to disconnect the first power generation device 14a from the third power supply circuit 18c and the second connection circuit 22b. After this, the process proceeds to step S4.

[0068] In step S4, the control device 30 determines whether the difference between the voltage of the first power supply system 12a and the voltage of the second power supply system 12b is below a first voltage threshold. If it is determined that the difference between the voltage of the first power supply system 12a and the voltage of the second power supply system 12b is greater than the first voltage threshold (step S4: No), the process proceeds to step S5. The first voltage threshold is predetermined based on the magnitude of the current that each device in the power supply system 10 can withstand.

[0069] In step S5, control device 30 performs a first power suppression control on the first inverter 15a. Additionally, control device 30 performs a second power suppression control on the third inverter 15c. Furthermore, control device 30 performs a third power suppression control on the fifth inverter 15e. Additionally, control device 30 performs a fourth power suppression control on the seventh inverter 15g. After this, the process proceeds to step S6.

[0070] The first power suppression control refers to controlling the ratio (hereinafter referred to as the first power) of the power supplied from the first inverter 15a to the first motor 17a to the power consumption of the first motor 17a to be smaller than the DC power supply from the first generator 14a to the first power supply circuit 18a before it is cut off.

[0071] The 2nd electric power suppression control refers to control of a ratio (hereinafter referred to as a 3rd ratio) of electric power supplied from the 3rd inverter 15c to the 2nd electric motor 17b (hereinafter referred to as 3rd electric power) to power consumption of the 2nd electric motor 17b to be smaller than before the supply of direct-current electric power from the 1st power generating device 14a to the 1st electric power supply circuit 18a is cut off.

[0072] The 3rd electric power suppression control refers to control of a ratio (hereinafter referred to as a 5th ratio) of electric power supplied from the 5th inverter 15e to the 3rd electric motor 17c (hereinafter referred to as 5th electric power) to power consumption of the 3rd electric motor 17c to be smaller than before the supply of direct-current electric power from the 1st power generating device 14a to the 3rd electric power supply circuit 18c is cut off.

[0073] The 4th electric power suppression control refers to control of a ratio (hereinafter referred to as a 7th ratio) of electric power supplied from the 7th inverter 15g to the 4th electric motor 17d (hereinafter referred to as 7th electric power) to power consumption of the 4th electric motor 17d to be smaller than before the supply of direct-current electric power from the 1st power generating device 14a to the 3rd electric power supply circuit 18c is cut off.

[0074] In step S6, the control device 30 executes the 1st electric power increase control on the 2nd inverter 15b. In addition, the control device 30 executes the 2nd electric power increase control on the 4th inverter 15d. Further, the control device 30 executes the 3rd electric power increase control on the 6th inverter 15f. In addition, the control device 30 executes the 4th electric power increase control on the 8th inverter 15h. After this, the processing proceeds to step S7.

[0075] The 1st electric power increase control refers to control of a ratio (hereinafter referred to as a 2nd ratio) of electric power supplied from the 2nd inverter 15b to the 1st electric motor 17a (hereinafter referred to as 2nd electric power) to power consumption of the 1st electric motor 17a to be larger than before the supply of direct-current electric power from the 1st power generating device 14a to the 1st electric power supply circuit 18a is cut off.

[0076] The magnitude of the 1st ratio decreased by the above-mentioned 1st electric power suppression control is equal to the magnitude of the 2nd ratio increased by the 1st electric power increase control. Accordingly, by executing the 1st electric power suppression control and the 1st electric power increase control, it is possible to suppress the increase and decrease of the output torque of the 1st electric motor 17a. The difference between the magnitude of the 1st ratio decreased by the 1st electric power suppression control and the magnitude of the 2nd ratio increased by the 1st electric power increase control can also be equal to or less than a prescribed value.

[0077] The 2nd electric power increase control is control to make the ratio (hereinafter referred to as a 4th ratio) of the electric power supplied from the 4th inverter 15d to the 2nd electric motor 17b (hereinafter referred to as a 4th electric power) to the power consumption of the 2nd electric motor 17b larger than before the supply of the direct current electric power from the 1st power generating device 14a to the 1st electric power supply circuit 18a is cut off.

[0078] The size of the 3rd ratio decreased by the 2nd electric power suppression control is equal to the size of the 4th ratio increased by the 2nd electric power increase control. Accordingly, by executing the 2nd electric power suppression control and the 2nd electric power increase control, it is possible to suppress the increase and decrease of the output torque of the 2nd electric motor 17b. The difference between the size of the 3rd ratio decreased by the 2nd electric power suppression control and the size of the 4th ratio increased by the 2nd electric power increase control can also be equal to or less than a predetermined value.

[0079] The 3rd electric power increase control is control to make the ratio (hereinafter referred to as a 6th ratio) of the electric power supplied from the 6th inverter 15f to the 3rd electric motor 17c (hereinafter referred to as a 6th electric power) to the power consumption of the 3rd electric motor 17c larger than before the supply of the direct current electric power from the 1st power generating device 14a to the 3rd electric power supply circuit 18c is cut off.

[0080] The size of the 5th ratio decreased by the 3rd electric power suppression control is equal to the size of the 6th ratio increased by the 3rd electric power increase control. Accordingly, by executing the 3rd electric power suppression control and the 3rd electric power increase control, it is possible to suppress the increase and decrease of the output torque of the 3rd electric motor 17c. The difference between the size of the 5th ratio decreased by the 3rd electric power suppression control and the size of the 6th ratio increased by the 3rd electric power increase control can also be equal to or less than a predetermined value.

[0081] The 4th electric power increase control is control to make the ratio (hereinafter referred to as an 8th ratio) of the electric power supplied from the 8th inverter 15h to the 4th electric motor 17d (hereinafter referred to as an 8th electric power) to the power consumption of the 4th electric motor 17d larger than before the supply of the direct current electric power from the 1st power generating device 14a to the 3rd electric power supply circuit 18c is cut off.

[0082] The size of the 7th ratio decreased by the 4th electric power suppression control is equal to the size of the 8th ratio increased by the 4th electric power increase control. Accordingly, by executing the 4th electric power suppression control and the 4th electric power increase control, it is possible to suppress the increase and decrease of the output torque of the 4th electric motor 17d. The difference between the size of the 7th ratio decreased by the 4th electric power suppression control and the size of the 8th ratio increased by the 4th electric power increase control can also be equal to or less than a predetermined value.

[0083] In step S7, the control device 30 determines whether the difference between the voltage of the first electric power supply system 12a and the voltage of the second electric power supply system 12b is equal to or less than a second voltage threshold value. In a case where it is determined that the difference between the voltage of the first electric power supply system 12a and the voltage of the second electric power supply system 12b is greater than the second voltage threshold value (step S7: No), the routine returns to step S5. The second voltage threshold value is determined in advance in accordance with the magnitude of current that each device and each component of the electric power supply system 10 can withstand. The second voltage threshold value can be the same value as the first voltage threshold value described above, or can be a different value from the first voltage threshold value.

[0084] In a case where it is determined in step S4 described above that the difference between the voltage of the first electric power supply system 12a and the voltage of the second electric power supply system 12b is equal to or less than the first voltage threshold value (step S4: Yes), or in a case where it is determined in step S7 prior thereto that the difference between the voltage of the first electric power supply system 12a and the voltage of the second electric power supply system 12b is equal to or less than the second voltage threshold value (step S7: Yes), the routine proceeds to step S8.

[0085] In step S8, the control device 30 performs connection control on the first connection device 24a. Thereby, the first electric power supply circuit 18a and the second electric power supply circuit 18b are connected through the first connection circuit 22a. After that, the routine proceeds to step S9.

[0086] In step S9, the control device 30 performs connection control on the second connection device 24b. Thereby, the third electric power supply circuit 18c and the fourth electric power supply circuit 18d are connected through the second connection circuit 22b. After that, the fail-safe control is ended.

[0087] In a case where it is determined in step S1 described above that direct current is supplied from the first power generation device 14a to the first electric power supply circuit 18a and the third electric power supply circuit 18c (step S1: No), the routine proceeds to step S10.

[0088] In step S10, the control device 30 determines whether the electric power supply from the second power generation device 14b to the second electric power supply circuit 18b and the fourth electric power supply circuit 18d is cut off. In a case where it is determined that the electric power supply from the second power generation device 14b to the second electric power supply circuit 18b and the fourth electric power supply circuit 18d is cut off (step S10: Yes), the routine proceeds to step S11. In a case where it is determined that electric power is being supplied from the second power generation device 14b to the second electric power supply circuit 18b and the fourth electric power supply circuit 18d (step S10: No), the fail-safe control is ended.

[0089] In step Sll, the control device 30 controls the disconnection device 26b to disconnect the second electric power generating device 14b from the second electric power supply circuit 18b and the first connection circuit 22a. After this, the process proceeds to step S12.

[0090] In step S12, the control device 30 controls the disconnection device 26d to disconnect the second electric power generating device 14b from the fourth electric power supply circuit 18d and the second connection circuit 22b. After this, the process proceeds to step S13.

[0091] In step S13, the control device 30 determines whether the difference between the voltage of the first electric power supply system 12a and the voltage of the second electric power supply system 12b is equal to or less than the first voltage threshold value. In the case where it is determined that the difference between the voltage of the first electric power supply system 12a and the voltage of the second electric power supply system 12b is greater than the first voltage threshold value (step S13: No), the process proceeds to step S14.

[0092] In step S14, the control device 30 executes fifth electric power suppression control on the second inverter 15b. In addition, the control device 30 executes sixth electric power suppression control on the fourth inverter 15d. Furthermore, the control device 30 executes seventh electric power suppression control on the sixth inverter 15f. In addition, the control device 30 executes eighth electric power suppression control on the eighth inverter 15h. After this, the process proceeds to step S15.

[0093] The fifth electric power suppression control refers to control of the second proportion of the second electric power supplied from the second inverter 15b to the first motor 17a with respect to the power consumption of the first motor 17a to be smaller than before the direct current electric power supply from the second electric power generating device 14b to the second electric power supply circuit 18b is cut off.

[0094] The sixth electric power suppression control refers to control of the fourth proportion of the fourth electric power supplied from the fourth inverter 15d to the second motor 17b with respect to the power consumption of the second motor 17b to be smaller than before the direct current electric power supply from the second electric power generating device 14b to the second electric power supply circuit 18b is cut off.

[0095] The seventh electric power suppression control refers to control of the sixth proportion of the sixth electric power supplied from the sixth inverter 15f to the third motor 17c with respect to the power consumption of the third motor 17c to be smaller than before the direct current electric power supply from the second electric power generating device 14b to the fourth electric power supply circuit 18d is cut off.

[0096] The eighth electric power suppression control refers to control of the eighth proportion of the eighth electric power supplied from the eighth inverter 15h to the fourth motor 17d with respect to the power consumption of the fourth motor 17d to be smaller than before the direct current electric power supply from the second electric power generating device 14b to the fourth electric power supply circuit 18d is cut off.

[0097] In step S15, the control device 30 executes the 5th electric power increase control on the 1st inverter 15a. In addition, the control device 30 executes the 6th electric power increase control on the 3rd inverter 15c. Further, the control device 30 executes the 7th electric power increase control on the 5th inverter 15e. In addition, the control device 30 executes the 8th electric power increase control on the 7th inverter 15g. After this, the processing proceeds to step S16.

[0098] The 5th electric power increase control refers to control of the 1st proportion of the 1st electric power supplied from the 1st inverter 15a to the 1st motor 17a with respect to the power consumption of the 1st motor 17a to be larger than before the supply of the direct current electric power from the 2nd power generating device 14b to the 2nd electric power supply circuit 18b is cut off.

[0099] The size of the 2nd proportion reduced by the above-mentioned 5th electric power suppression control is equal to the size of the 1st proportion made larger by the 5th electric power increase control. Accordingly, by executing the 5th electric power suppression control and the 5th electric power increase control, it is possible to suppress the increase and decrease of the output torque of the 1st motor 17a. The difference between the size of the 2nd proportion reduced by the 5th electric power suppression control and the size of the 1st proportion made larger by the 5th electric power increase control can also be equal to or less than a prescribed value.

[0100] The 6th electric power increase control refers to control of the 3rd proportion of the 3rd electric power supplied from the 3rd inverter 15c to the 2nd motor 17b with respect to the power consumption of the 2nd motor 17b to be larger than before the supply of the direct current electric power from the 2nd power generating device 14b to the 2nd electric power supply circuit 18b is cut off.

[0101] The size of the 4th proportion reduced by the above-mentioned 6th electric power suppression control is equal to the size of the 3rd proportion made larger by the 6th electric power increase control. Accordingly, by executing the 6th electric power suppression control and the 6th electric power increase control, it is possible to suppress the increase and decrease of the output torque of the 2nd motor 17b. The difference between the size of the 4th proportion reduced by the 6th electric power suppression control and the size of the 3rd proportion made larger by the 6th electric power increase control can also be equal to or less than a prescribed value.

[0102] The 7th electric power increase control refers to control of the 5th proportion of the 5th electric power supplied from the 5th inverter 15e to the 3rd motor 17c with respect to the power consumption of the 3rd motor 17c to be larger than before the supply of the direct current electric power from the 2nd power generating device 14b to the 4th electric power supply circuit 18d is cut off.

[0103] The size of the 6th proportion reduced by the above-mentioned 7th electric power reduction control is equal to the size of the 5th proportion increased by the 7th electric power increase control. Accordingly, by executing the 7th electric power reduction control and the 7th electric power increase control, it is possible to suppress the increase and decrease of the output torque of the 3rd electric motor 17c. The difference between the size of the 6th proportion reduced by the 7th electric power reduction control and the size of the 5th proportion increased by the 7th electric power increase control can also be below a prescribed value.

[0104] The 8th electric power increase control refers to control of the 7th proportion of the 7th electric power supplied from the 7th inverter 15g to the 4th electric motor 17d with respect to the power consumption of the 4th electric motor 17d to be larger than before the supply of the direct current electric power from the 2nd electric power supply device 14b to the 4th electric power supply circuit 18d is cut off.

[0105] The size of the 8th proportion reduced by the above-mentioned 8th electric power reduction control is equal to the size of the 7th proportion increased by the 8th electric power increase control. Accordingly, by executing the 8th electric power reduction control and the 8th electric power increase control, it is possible to suppress the increase and decrease of the output torque of the 4th electric motor 17d. The difference between the size of the 8th proportion reduced by the 8th electric power reduction control and the size of the 7th proportion increased by the 8th electric power increase control can also be below a prescribed value.

[0106] In step S16, the control device 30 determines whether the difference between the voltage of the 1st electric power supply system 12a and the voltage of the 2nd electric power supply system 12b is below the 2nd voltage threshold value. In the case where it is determined that the difference between the voltage of the 1st electric power supply system 12a and the voltage of the 2nd electric power supply system 12b is larger than the 2nd voltage threshold value (step S16: No), the process returns to step S14.

[0107] In the case where it is determined in the above-mentioned step S13 that the difference between the voltage of the 1st electric power supply system 12a and the voltage of the 2nd electric power supply system 12b is below the 1st voltage threshold value (step S13: Yes), or in the case where it is determined in step S16 prior thereto that the difference between the voltage of the 1st electric power supply system 12a and the voltage of the 2nd electric power supply system 12b is below the 2nd voltage threshold value (step S16: Yes), the process proceeds to step S17.

[0108] In step S17, the control device 30 executes connection control on the 1st connection device 24a. Accordingly, the 1st electric power supply circuit 18a and the 2nd electric power supply circuit 18b are connected through the 1st connection circuit 22a. After this, the process proceeds to step S18.

[0109] In step S18, the control device 30 performs connection control on the second connection device 24b. By this, the third electric power supply circuit 18c and the fourth electric power supply circuit 18d are connected through the second connection circuit 22b. After this, the fail-safe control is ended.

[0110] [Approximation of voltage of first electric power supply system and voltage of second electric power supply system] In the electric power supply system 10 of one embodiment, in a case where there is a difference between the voltage of the first electric power supply system 12a and the voltage of the second electric power supply system 12b, the voltage of the first electric power supply system 12a and the voltage of the second electric power supply system 12b are approximated before the first electric power supply system 12a and the second electric power supply system 12b are connected.

[0111] Next, a state of the electric power supply system 10 in a case where the first electric power supply system 12a and the second electric power supply system 12b are connected in a state where there is a difference between the voltage of the first electric power supply system 12a and the voltage of the second electric power supply system 12b is described.

[0112] Figures 8A-8C is a graph showing a change in state of the electric power supply system 10 over time before and after the time at which the first electric power supply system 12a and the second electric power supply system 12b are connected. Figure 8A The graph of shows a change in voltage of the first electric power supply system 12a over time and a change in voltage of the second electric power supply system 12b over time. Figure 8B The graph of shows a change in output torque of the first electric motor 17a, a change in output torque of the second electric motor 17b, a change in output torque of the third electric motor 17c, and a change in output torque of the fourth electric motor 17d over time. Figure 8C The graph of shows a change in current flowing through the first connection circuit 22a and the second connection circuit 22b over time. In the graph of Figures 8A-8C In each of the graphs of, a change in voltage, electric power, and current over time is schematically shown.

[0113] At time tl, direct-current electric power supply from the first power generation device 14a to the first electric power supply circuit 18a and the third electric power supply circuit 18c is turned off. At time t2, the first electric power supply circuit 18a and the second electric power supply circuit 18b are connected, and the third electric power supply circuit 18c and the fourth electric power supply circuit 18d are connected. In the period shown in each of the graphs of Figures 8A-8C In the period shown in each of the graphs of, power consumption of the first electric motor 17a, power consumption of the second electric motor 17b, power consumption of the third electric motor 17c, and power consumption of the fourth electric motor 17d are constant.

[0114] During the period before time tl, the output electric power of the first power generation device 14a is equal to half the sum of the power consumption of the first motor 17a, the power consumption of the second motor 17b, the power consumption of the third motor 17c, and the power consumption of the fourth motor 17d. Also, during the period before time tl, the output electric power of the second power generation device 14b is also equal to half the sum of the power consumption of the first motor 17a, the power consumption of the second motor 17b, the power consumption of the third motor 17c, and the power consumption of the fourth motor 17d. Therefore, the first electric storage device 16a, the second electric storage device 16b, the third electric storage device 16c, and the fourth electric storage device 16d are not charged or discharged.

[0115] At time tl, the direct-current electric power supply from the first power generation device 14a to the first electric power supply circuit 18a and the third electric power supply circuit 18c is cut off, and therefore, at time tl, the first electric storage device 16a and the third electric storage device 16c start discharging. After the first electric storage device 16a starts discharging, the output electric power of the first electric storage device 16a increases, and the output current of the first electric storage device 16a becomes large. Therefore, in the first electric storage device 16a, the voltage drop amount due to the internal resistance becomes large, and the output voltage of the first electric storage device 16a drops. Also, after the third electric storage device 16c starts discharging, the output electric power of the third electric storage device 16c increases, and the output current of the third electric storage device 16c becomes large. Therefore, in the third electric storage device 16c, the voltage drop amount due to the internal resistance becomes large, and the output voltage of the third electric storage device 16c drops. That is, the voltage of the first electric power supply system 12a drops (a portion indicated by reference sign P of FIG. 6). Figure 8A

[0116] Also, during the period from time tl to time t2, electric power is supplied from the first electric storage device 16a to the first inverter 15a and the third inverter 15c, and electric power is supplied from the third electric storage device 16c to the fifth inverter 15e and the seventh inverter 15g. That is, during the period from time tl to time t2, the first electric storage device 16a and the third electric storage device 16c discharge, and therefore, the SOC (State Of Charge) of the first electric storage device 16a and the SOC of the third electric storage device 16c gradually drop. Along with the drop in the SOC, the open-circuit voltage of the first electric storage device 16a and the open-circuit voltage of the third electric storage device 16c drop, and the output voltage of the first electric storage device 16a and the output voltage of the third electric storage device 16c gradually drop. That is, the voltage of the first electric power supply system 12a gradually drops (a portion indicated by reference sign Q of FIG. 6). Figure 8A

[0117] ​​On the other hand, during the period from time t1 to time t2, electric power is supplied from the second power generation device 14b to the second inverter 15b, the fourth inverter 15d, the sixth inverter 15f, and the eighth inverter 15h. That is, during the period from time t1 to time t2, the second electric storage device 16b and the fourth electric storage device 16d do not perform charge and discharge. Therefore, the output current of the second electric storage device 16b and the output current of the fourth electric storage device 16d do not change, and the voltage drop amount due to the internal resistance does not change in the second electric storage device 16b and the fourth electric storage device 16d. Further, the SOC of the second electric storage device 16b and the SOC of the fourth electric storage device 16d are maintained. Therefore, the output voltage of the second electric storage device 16b and the output voltage of the fourth electric storage device 16d are maintained. That is, the voltage of the second electric power supply system 12b is maintained.

[0118] The voltage of the first electric power supply system 12a decreases, and the voltage of the second electric power supply system 12b is maintained, and therefore the difference between the voltage of the first electric power supply system 12a and the voltage of the second electric power supply system 12b increases. Therefore, at time t2, when the first electric power supply circuit 18a and the second electric power supply circuit 18b are connected, and the third electric power supply circuit 18c and the fourth electric power supply circuit 18d are connected, an overcurrent flows in the electric power supply system 10. The overcurrent can damage each device and each component of the electric power supply system 10. In addition, in a case where each device and each component of the electric power supply system 10 is set to a specification capable of withstanding the overcurrent, there is a problem that the manufacturing cost of the electric power supply system 10 increases.

[0119] Hereinafter, the state of the electric power supply system 10 in a case where the first electric power supply system 12a and the second electric power supply system 12b are connected after the voltage of the first electric power supply system 12a and the voltage of the second electric power supply system 12b are made approximate will be described.

[0120] Figures 9A-9C is a graph showing the change in the state of the electric power supply system 10 over time in the period before and after the time when the first electric power supply system 12a and the second electric power supply system 12b are connected. Figure 9A The graph of shows the change in the voltage of the first electric power supply system 12a over time and the change in the voltage of the second electric power supply system 12b over time. Figure 9B The graph of shows the change in the output torque of the first motor 17a, the output torque of the second motor 17b, the output torque of the third motor 17c, and the output torque of the fourth motor 17d over time. Figure 9C The graph of shows the change in the current flowing in the first connection circuit 22a and the second connection circuit 22b. In the graph of Figures 9A-9C In each graph of, the change in the voltage, the electric power, and the current over time is schematically shown.

[0121] At time t11, the DC power supply from the first power generation unit 14a to the first power supply circuit 18a and the third power supply circuit 18c is disconnected. At time t12, the first power suppression control is performed on the first inverter 15a, the second power suppression control is performed on the third inverter 15c, the third power suppression control is performed on the fifth inverter 15e, and the fourth power suppression control is performed on the seventh inverter 15g. Additionally, at time t12, the first power increase control is performed on the second inverter 15b, the second power increase control is performed on the fourth inverter 15d, the third power increase control is performed on the sixth inverter 15f, and the fourth power increase control is performed on the eighth inverter 15h.

[0122] During the period prior to time t11, the output power of the first power generation device 14a is equal to half the sum of the power consumption of the first motor 17a, the second motor 17b, the third motor 17c, and the fourth motor 17d. Furthermore, during the period prior to time t11, the output power of the second power generation device 14b is equal to half the sum of the power consumption of the first motor 17a, the second motor 17b, the third motor 17c, and the fourth motor 17d. Therefore, the first energy storage device 16a, the second energy storage device 16b, the third energy storage device 16c, and the fourth energy storage device 16d are not charging or discharging.

[0123] and Figure 8A The time intervals t1 to t2 are the same. Figure 9A During the period from time t11 to time t12, the voltage of the first power supply system 12a decreases, while maintaining the voltage of the second power supply system 12b. Therefore, the difference between the voltage of the first power supply system 12a and the voltage of the second power supply system 12b increases.

[0124] In one embodiment of the power supply system 10, at time t12, a first power suppression control is performed on the first inverter 15a, a second power suppression control is performed on the third inverter 15c, a third power suppression control is performed on the fifth inverter 15e, and a fourth power suppression control is performed on the seventh inverter 15g.

[0125] By the first electric power suppression control and the second electric power suppression control, the output electric power of the first electric storage device 16a gradually becomes smaller, and the output electric current of the first electric storage device 16a also gradually becomes smaller. Therefore, in the first electric storage device 16a, the voltage drop amount due to the internal resistance gradually becomes smaller. Also, by the third electric power suppression control and the fourth electric power suppression control, the output electric power of the third electric storage device 16c gradually becomes smaller, and the output electric current of the third electric storage device 16c gradually becomes smaller. Therefore, in the third electric storage device 16c, the voltage drop amount due to the internal resistance gradually becomes smaller.

[0126] Further, in the period from the time t12 to the time t13, the electric power supplied from the first inverter 15a to the first motor 17a is decreased, and the electric power supplied from the third inverter 15c to the second motor 17b is decreased, as compared with the period from the time tll to the time t12. Therefore, the decrease in the SOC of the first electric storage device 16a is suppressed. Also, in the period from the time t12 to the time t13, the electric power supplied from the fifth inverter 15e to the third motor 17c is decreased, and the electric power supplied from the seventh inverter 15g to the fourth motor 17d is decreased, as compared with the period from the time tll to the time t12. Therefore, the decrease in the SOC of the third electric storage device 16c is suppressed.

[0127] As described above, the voltage drop amount due to the internal resistance in the first electric storage device 16a and the third electric storage device 16c is suppressed from becoming smaller, and the decrease in the SOC of the first electric storage device 16a and the SOC of the third electric storage device 16c is suppressed, and therefore, the decrease in the output voltage of the first electric storage device 16a and the output voltage of the third electric storage device 16c is suppressed. That is, the decrease in the voltage of the first electric power supply system 12a is suppressed.

[0128] Also, in the electric power supply system 10 of the embodiment, at the time t12, the first electric power increase control is executed on the second inverter 15b, the second electric power increase control is executed on the fourth inverter 15d, the third electric power increase control is executed on the sixth inverter 15f, and the fourth electric power increase control is executed on the eighth inverter 15h.

[0129] By the first electric power increase control, the second electric power increase control, the third electric power increase control, and the fourth electric power increase control, the electric power required by each of the second inverter 15b, the fourth inverter 15d, the sixth inverter 15f, and the eighth inverter 15h is increased. Therefore, the second electric power generation device 14b is controlled to increase the output electric power. However, since the response speed of the output electric power of the second electric power generation device 14b is relatively slow, for a certain period of time, the output electric power of the second electric power generation device 14b is in a state where it cannot satisfy the sum of the electric power required by each of the second inverter 15b, the fourth inverter 15d, the sixth inverter 15f, and the eighth inverter 15h.

[0130] The deficient electric power is supplied from the 2nd electric storage device 16b to the 2nd inverter 15b and the 4th inverter 15d, and from the 4th electric storage device 16d to the 6th inverter 15f and the 8th inverter 15h. As the required electric power of each of the 2nd inverter 15b and the 4th inverter 15d gradually increases, the output electric power of the 2nd electric storage device 16b gradually increases, and the output electric current of the 2nd electric storage device 16b gradually becomes large. Therefore, in the 2nd electric storage device 16b, the voltage drop amount due to the internal resistance gradually becomes large. In addition, as the required electric power of each of the 6th inverter 15f and the 8th inverter 15h gradually increases, the output electric power of the 4th electric storage device 16d gradually increases, and the output electric current of the 4th electric storage device 16d gradually becomes large. Therefore, in the 4th electric storage device 16d, the voltage drop amount due to the internal resistance gradually becomes large.

[0131] Further, during the period from time t12 to time t13, the 2nd electric storage device 16b and the 4th electric storage device 16d perform discharging, and thus the decrease of the SOC of the 2nd electric storage device 16b and the SOC of the 4th electric storage device 16d is promoted.

[0132] As described above, in the 2nd electric storage device 16b and the 4th electric storage device 16d, the voltage drop amount due to the internal resistance gradually becomes large, and the decrease of the SOC of the 2nd electric storage device 16b and the SOC of the 4th electric storage device 16d is promoted, and thus the decrease of the output voltage of the 2nd electric storage device 16b and the output voltage of the 4th electric storage device 16d is promoted. That is, the decrease of the voltage of the 2nd electric power supply system 12b is promoted.

[0133] The decrease of the voltage of the 2nd electric power supply system 12b is promoted, and the decrease of the voltage of the 1st electric power supply system 12a is suppressed, and thus it is possible to make the voltage of the 2nd electric power supply system 12b close to the voltage of the 1st electric power supply system 12a. At time t13 at which the voltage of the 1st electric power supply system 12a and the voltage of the 2nd electric power supply system 12b are close to each other, the 1st electric power supply circuit 18a and the 2nd electric power supply circuit 18b are connected, and the 3rd electric power supply circuit 18c and the 4th electric power supply circuit 18d are connected. Accordingly, it is possible to suppress the overcurrent from flowing through the electric power supply system 10. Therefore, the damage of each device and each component of the electric power supply system 10 is suppressed. In addition, it is not necessary to set each device and each component of the electric power supply system 10 to a specification capable of withstanding the overcurrent, and thus it is possible to suppress the manufacturing cost of the electric power supply system 10.

[0134] Further, in a case where the first electric power suppression control is executed on the first inverter 15a, the first electric power supplied from the first inverter 15a to the first motor 17a decreases in a first proportion with respect to the power consumption of the first motor 17a. However, by executing the first electric power increase control on the second inverter 15b, the second electric power supplied from the second inverter 15b to the first motor 17a increases in a second proportion with respect to the power consumption of the first motor 17a. Thereby, the output torque of the first motor 17a is maintained.

[0135] Likewise, in a case where the second electric power suppression control is executed on the third inverter 15c, the third electric power supplied from the third inverter 15c to the second motor 17b decreases in a third proportion with respect to the power consumption of the second motor 17b. However, by executing the second electric power increase control on the fourth inverter 15d, the fourth electric power supplied from the fourth inverter 15d to the second motor 17b increases in a fourth proportion with respect to the power consumption of the second motor 17b. Thereby, the output torque of the second motor 17b is maintained.

[0136] Further, in a case where the third electric power suppression control is executed on the fifth inverter 15e, the fifth electric power supplied from the fifth inverter 15e to the third motor 17c decreases in a fifth proportion with respect to the power consumption of the third motor 17c. However, by executing the third electric power increase control on the sixth inverter 15f, the sixth electric power supplied from the sixth inverter 15f to the third motor 17c increases in a sixth proportion with respect to the power consumption of the third motor 17c. Thereby, the output torque of the third motor 17c is maintained.

[0137] Further, in a case where the fourth electric power suppression control is executed on the seventh inverter 15g, the seventh electric power supplied from the seventh inverter 15g to the fourth motor 17d decreases in a seventh proportion with respect to the power consumption of the fourth motor 17d. However, by executing the fourth electric power increase control on the eighth inverter 15h, the eighth electric power supplied from the eighth inverter 15h to the fourth motor 17d increases in an eighth proportion with respect to the power consumption of the fourth motor 17d. Thereby, the output torque of the fourth motor 17d is maintained.

[0138] In the above, the case where the direct-current electric power supply from the first power generating device 14a to the first electric power supply circuit 18a and the third electric power supply circuit 18c is disconnected is explained. However, in a case where the direct-current electric power supply from the second power generating device 14b to the second electric power supply circuit 18b and the fourth electric power supply circuit 18d is disconnected, the first electric power supply system 12a and the second electric power supply system 12b are connected after the voltage of the first electric power supply system 12a is made approximate to the voltage of the second electric power supply system 12b.

[0139] In a case where the direct-current electric power supply from the 2nd power generating device 14b to the 2nd electric power supply circuit 18b and the 4th electric power supply circuit 18d is cut off, the 5th electric power suppression control is executed on the 2nd inverter 15b, the 6th electric power suppression control is executed on the 4th inverter 15d, the 7th electric power suppression control is executed on the 6th inverter 15f, and the 8th electric power suppression control is executed on the 8th inverter 15h. Also, the 5th electric power increase control is executed on the 1st inverter 15a, the 6th electric power increase control is executed on the 3rd inverter 15c, the 7th electric power increase control is executed on the 5th inverter 15e, and the 8th electric power increase control is executed on the 7th inverter 15g. Thereby, the voltage of the 1st electric power supply system 12a is made to approximate the voltage of the 2nd electric power supply system 12b.

[0140] [Comparison with the electric power supply system of the comparative example] Figure 10 is a schematic view of the electric power supply system 100 in the comparative example. The electric power supply system 100 of the comparative example has voltage conversion devices 30a to 30d. The voltage conversion devices 30a to 30d are DC-DC converters.

[0141] In the electric power supply system 100, the voltage of each of the voltage conversion devices 30a to 30d is made to be approximately equal. Therefore, when the 1st electric power supply circuit 18a and the 2nd electric power supply circuit 18b are connected by the 1st connection device 24a, it is possible to prevent overcurrent from flowing through the 1st electric power supply circuit 18a and the 2nd electric power supply circuit 18b. Similarly, when the 3rd electric power supply circuit 18c and the 4th electric power supply circuit 18d are connected by the 2nd connection device 24b, it is possible to prevent overcurrent from flowing through the 3rd electric power supply circuit 18c and the 4th electric power supply circuit 18d.

[0142] However, since the electric power supply system 100 has the voltage conversion devices 30a to 30d, there is a problem that the number of components constituting the electric power supply system 100 increases, the weight of the electric power supply system 100 becomes heavy, and the manufacturing cost of the electric power supply system 100 increases. The electric power supply system 10 of one embodiment does not have the voltage conversion devices 30a to 30d, and thus it is possible to reduce the number of components constituting the electric power supply system 10, to achieve weight reduction of the electric power supply system 10, and to suppress the manufacturing cost of the electric power supply system 10.

[0143] The electric power supply system 10 of one embodiment has the 1st connection circuit 22a and the 2nd connection circuit 22b. However, the above-described technology can also be applied to an electric power supply system 10 that does not have the 1st connection circuit 22a and the 2nd connection circuit 22b.

[0144] For example, in a case where the direct-current electric power supply from the first power generating device 14a to the first electric power supply circuit 18a and the third electric power supply circuit 18c is cut off, the first electric power suppression control is executed on the first inverter 15a, the second electric power suppression control is executed on the third inverter 15c, the third electric power suppression control is executed on the fifth inverter 15e, and the fourth electric power suppression control is executed on the seventh inverter 15g. Thereby, the SOC of the first electric storage device 16a and the third electric storage device 16c can be suppressed from decreasing.

[0145] In addition, in a case where the direct-current electric power supply from the first power generating device 14a to the first electric power supply circuit 18a and the third electric power supply circuit 18c is cut off, the first electric power increase control is executed on the second inverter 15b, the second electric power increase control is executed on the fourth inverter 15d, the third electric power increase control is executed on the sixth inverter 15f, and the fourth electric power increase control is executed on the eighth inverter 15h. Thereby, the electric power corresponding to the amount of decrease in the electric power supplied from the first electric power supply system 12a to the first motor 17a to the fourth motor 17d can be supplied from the second electric power supply system 12b to the first motor 17a to the fourth motor 17d. Therefore, the output torque of the first motor 17a to the fourth motor 17d can be suppressed from decreasing.

[0146] With respect to the above-described embodiment, the following supplementary notes are also disclosed.

[0147] (Supplementary Note 1) The electric power supply system (10) of the present application has a first electric power supply circuit (18a), a first electric storage device (16a), a second electric power supply circuit (18b), a second electric storage device (16b), a first electric motor (17a), and a control device (30), wherein the first electric power supply circuit supplies direct current electric power output from a first electric power generator (14a) to a first inverter (15a); the first electric storage device is connected in parallel with the first electric power generator to the first electric power supply circuit; the second electric power supply circuit supplies direct current electric power output from a second electric power generator (14b) to a second inverter (15b); the second electric storage device is connected in parallel with the second electric power generator to the second electric power supply circuit; the first electric motor is a double-winding three-phase electric motor that can be driven by electric power converted to alternating current by the first inverter and can be driven by electric power converted to alternating current by the second inverter; and the control device controls the first inverter and the second inverter, and in the case where direct current electric power supply from the first electric power generator to the first electric power supply circuit is cut off, the control device performs first electric power suppression control on the first inverter and first electric power increase control on the second inverter, wherein the first electric power suppression control is control of a first ratio of a proportion of first electric power supplied from the first inverter to the first electric motor with respect to power consumption of the first electric motor to be smaller than before direct current electric power supply from the first electric power generator to the first electric power supply circuit is cut off, and the first electric power increase control is control of a second ratio of a proportion of second electric power supplied from the second inverter to the first electric motor with respect to power consumption of the first electric motor to be larger than before direct current electric power supply from the first electric power generator to the first electric power supply circuit is cut off. Accordingly, even in the case where direct current electric power supply from the first electric power generator to the first electric power supply circuit is cut off, it is possible to suppress a decrease in output torque of the first electric motor.

[0148] (Addendum 2) In the electric power supply system according to the supplementary note 1, the electric power supply system can further include a connection circuit (22a) having a connection device (24a) capable of connecting the first electric power supply circuit and the second electric power supply circuit, and the control device can perform connection control on the connection device for connecting the first electric power supply circuit and the second electric power supply circuit through the connection circuit, in a case where the direct-current electric power supply from the first power generation device to the first electric power supply circuit is cut off and a difference between a voltage of the first electric power supply circuit and a voltage of the second electric power supply circuit is equal to or greater than a predetermined first voltage threshold, the control device performs the first electric power reduction control on the first inverter and performs the first electric power increase control on the second inverter until the difference between the voltage of the first electric power supply circuit and the voltage of the second electric power supply circuit is less than a predetermined second voltage threshold, and then performs the connection control on the connection device. According to this, in a case where the connection control is performed on the connection device, overcurrent flowing through the electric power supply system can be suppressed.

[0149] (Supplementary Note 3) In the electric power supply system according to the supplementary note 2, the electric power supply system can further include a disconnection device (26a) capable of disconnecting the first electric power supply circuit and the connection circuit from the first power generation device, and in a case where the electric power supply from the first power generation device to the first electric power supply circuit is cut off, the control device disconnects the first electric power supply circuit and the connection circuit from the first power generation device through the disconnection device, and then performs the connection control on the connection device. According to this, an abnormality of the first power generation device can be prevented from affecting the first electric power supply circuit and the connection circuit.

[0150] (Supplementary Note 4) In the electric power supply system according to the supplementary note 1, a difference between a size of the first proportion reduced by the first electric power reduction control and a size of the second proportion increased by the first electric power increase control can be equal to or less than a predetermined value. According to this, even in a case where the direct-current electric power supply from the first power generation device to the first electric power supply circuit is cut off, a decrease in output torque of the first electric motor can be suppressed.

[0151] (Supplementary Note 5) In the electric power supply system described in the supplementary note 1, further provided are a second electric motor (17b) that is a double-winding three-phase electric motor capable of being driven by electric power converted to alternating current by a third inverter (15c) and capable of being driven by electric power converted to alternating current by a fourth inverter (15d), the first electric power supply circuit supplies direct-current electric power output from the first electric power generation device to the first inverter and the third inverter, the second electric power supply circuit supplies direct-current electric power output from the second electric power generation device to the second inverter and the fourth inverter, in the case where the supply of direct-current electric power from the first electric power generation device to the first electric power supply circuit is cut off, the control device performs second electric power reduction control on the third inverter and performs second electric power increase control on the fourth inverter, wherein the second electric power reduction control is control to make a third electric power supplied from the third inverter to the second electric motor smaller in proportion to the power consumption of the second electric motor than before the supply of direct-current electric power from the first electric power generation device to the first electric power supply circuit is cut off, and the second electric power increase control is control to make a fourth electric power supplied from the fourth inverter to the second electric motor larger in proportion to the power consumption of the second electric motor than before the supply of direct-current electric power from the first electric power generation device to the first electric power supply circuit is cut off. According to this, even in the case where the supply of direct-current electric power from the first electric power generation device to the first electric power supply circuit is cut off, it is possible to suppress a decrease in output torque of the second electric motor.

[0152] (Supplementary note 6) In the electric power supply system described in the supplementary note 5, it can further have a connection circuit having a connection device capable of connecting the first electric power supply circuit and the second electric power supply circuit, and the control device can perform a connection control for connecting the first electric power supply circuit and the second electric power supply circuit through the connection circuit on the connection device, and in a case where the direct-current electric power supply from the first power generation device to the first electric power supply circuit is cut off and a difference between the voltage of the first electric power supply circuit and the voltage of the second electric power supply circuit is equal to or greater than a predetermined first voltage threshold value, the control device performs the first electric power suppression control on the first inverter, the first electric power increase control on the second inverter, the second electric power suppression control on the third inverter, and the second electric power increase control on the fourth inverter until the difference between the voltage of the first electric power supply circuit and the voltage of the second electric power supply circuit is smaller than a predetermined second voltage threshold value, and thereafter performs the connection control on the connection device. According to this, in a case where the connection control is performed on the connection device, overcurrent can be suppressed from flowing through the electric power supply system.

[0153] (Supplementary note 7) The mobile body of the present application has the electric power supply system described in any one of the supplementary notes 1 to 6. According to this, even in a case where the direct-current electric power supply from the first power generation device to the first electric power supply circuit is cut off, the drop in the output torque of the first electric motor can be suppressed.

[0154] (Supplementary note 8) The control method of the electric power supply system of the present application is a control method of an electric power supply system having a first electric power supply circuit that supplies direct-current electric power output from a first power generation device to a first inverter, a first electric storage device connected in parallel to the first power generation device to the first electric power supply circuit, a second electric power supply circuit that supplies direct-current electric power output from a second power generation device to a second inverter, a second electric storage device connected in parallel to the second power generation device to the second electric power supply circuit, and a first motor that is a dual-winding three-phase motor capable of being driven by electric power converted to alternating-current electric power by the first inverter and capable of being driven by electric power converted to alternating-current electric power by the second inverter, wherein, in a case where direct-current electric power supply from the first power generation device to the first electric power supply circuit is cut off, first electric power suppression control is executed on the first inverter, and first electric power increase control is executed on the second inverter, the first electric power suppression control refers to control of a first ratio of a first electric power supplied from the first inverter to the first motor with respect to power consumption of the first motor to be smaller than before direct-current electric power supply from the first power generation device to the first electric power supply circuit is cut off, and the first electric power increase control refers to control of a second ratio of a second electric power supplied from the second inverter to the first motor with respect to power consumption of the first motor to be larger than before direct-current electric power supply from the first power generation device to the first electric power supply circuit is cut off. According to this, even in a case where direct-current electric power supply from the first power generation device to the first electric power supply circuit is cut off, it is possible to suppress a decrease in output torque of the first motor.

[0155] (Note 9) The computer program product of the present application is for causing a computer to execute the control method of the electric power supply system described in Note 8. According to this, even in a case where direct-current electric power supply from the first power generation device to the first electric power supply circuit is cut off, it is possible to suppress a decrease in output torque of the first motor.

[0156] The present application has been described in detail, but the present application is not limited to each of the embodiments described above. These embodiments can be variously added, substituted, changed, partially deleted, and the like within a range not departing from the gist of the present application or within a range not departing from the gist of the present application derived from the content described by the technical solution and equivalents thereof. In addition, these embodiments can also be implemented in combination. For example, in the embodiments described above, the order of each action, the order of each process is shown as an example, but is not limited thereto. The same applies in the case where numerical values or mathematical formulas are used in the description of the embodiments described above.

Claims

1. An electric power supply system (10), characterized in that, It includes a first power supply circuit (18a), a first energy storage device (16a), a second power supply circuit (18b), a second energy storage device (16b), a first motor (17a), and a control device (30), wherein, The first power supply circuit will supply the DC power output from the first power generation device (14a) to the first inverter (15a); The first energy storage device and the first power generation device are connected in parallel to the first power supply circuit; The second power supply circuit will supply the DC power output from the second power generation device (14b) to the second inverter (15b); The second energy storage device and the second power generation device are connected in parallel to the second power supply circuit; The first motor is a dual-winding three-phase motor, which can be driven by the electrical power converted into AC by the first inverter, and can also be driven by the electrical power converted into AC by the second inverter. The control device controls the first inverter and the second inverter. When the DC power supply from the first power generation device to the first power supply circuit is cut off, the control device performs a first power suppression control on the first inverter and a first power increase control on the second inverter, wherein... The first power suppression control refers to controlling the ratio of the first power supplied from the first inverter to the first motor to the power consumption of the first motor, i.e., the first ratio, to be smaller than before the DC power supply from the first power generation device to the first power supply circuit is cut off. The first power increase control refers to controlling the ratio of the second power supplied from the second inverter to the first motor relative to the power consumption of the first motor, i.e., the second ratio control, to be greater than before the DC power supply from the first power generation device to the first power supply circuit was cut off.

2. The power supply system according to claim 1, characterized in that, It also includes a connection circuit (22a) having a connection device (24a) capable of connecting the first power supply circuit and the second power supply circuit. The control device is capable of performing connection control on the connection device, which is used to connect the first power supply circuit and the second power supply circuit through the connection circuit. When the DC power supply from the first power generation device to the first power supply circuit is cut off and the difference between the voltage of the first power supply circuit and the voltage of the second power supply circuit is greater than a predetermined first voltage threshold, the control device performs the first power suppression control on the first inverter and the first power increase control on the second inverter until the difference between the voltage of the first power supply circuit and the voltage of the second power supply circuit is less than a predetermined second voltage threshold, after which the connection control is performed on the connection device.

3. The power supply system according to claim 2, characterized in that, It also includes a disconnection device (26a) capable of disconnecting the first power supply circuit and the connection circuit from the first power generation device. In the event that the power supply from the first power generator to the first power supply circuit is cut off, the control device disconnects the first power supply circuit and the connection circuit from the first power generator via the disconnection device, and then performs the connection control on the connection device.

4. The power supply system according to claim 1, characterized in that, The difference between the magnitude of the first proportion, which is reduced by the first power suppression control, and the magnitude of the second proportion, which is increased by the first power increase control, is below a predetermined value.

5. The power supply system according to claim 1, characterized in that, It also has a second motor (17b), which is a dual-winding three-phase motor that can be driven by electrical power converted to AC by a third inverter (15c) and by electrical power converted to AC by a fourth inverter (15d). The first power supply circuit will supply the DC power output from the first power generation device to the first inverter and the third inverter. The second power supply circuit supplies the DC power output from the second power generation device to the second inverter and the fourth inverter. When the DC power supply from the first power generation device to the first power supply circuit is cut off, the control device performs a second power suppression control on the third inverter and a second power increase control on the fourth inverter, wherein... The second power suppression control refers to controlling the ratio of the third power supplied from the third inverter to the second motor to the power consumption of the second motor, i.e., the third ratio, to be smaller than before the DC power supply from the first power generation device to the first power supply circuit is cut off. The second power increase control refers to controlling the ratio of the fourth power supplied from the fourth inverter to the second motor relative to the power consumption of the second motor, i.e., the fourth ratio control, to be greater than before the DC power supply from the first power generation device to the first power supply circuit was cut off.

6. The power supply system according to claim 5, characterized in that, It also includes a connection circuit, which has a connection device capable of connecting the first power supply circuit and the second power supply circuit. The control device is capable of performing connection control on the connection device, which is used to connect the first power supply circuit and the second power supply circuit through the connection circuit. When the DC power supply from the first power generation device to the first power supply circuit is cut off and the difference between the voltage of the first power supply circuit and the voltage of the second power supply circuit is greater than a predetermined first voltage threshold, the control device performs the first power suppression control on the first inverter, the first power increase control on the second inverter, the second power suppression control on the third inverter, and the second power increase control on the fourth inverter until the difference between the voltage of the first power supply circuit and the voltage of the second power supply circuit is less than a predetermined second voltage threshold. After this, the connection control is performed on the connection device.

7. A mobile body, characterized in that, An electric power supply system having any one of claims 1 to 6.

8. A control method for an electric power supply system, the electric power supply system comprising a first electric power supply circuit, a first energy storage device, a second electric power supply circuit, a second energy storage device, and a first motor, wherein, The first power supply circuit will supply the DC power output from the first power generation device to the first inverter; The first energy storage device and the first power generation device are connected in parallel to the first power supply circuit; The second power supply circuit will supply the DC power output from the second power generation device to the second inverter; The second energy storage device and the second power generation device are connected in parallel to the second power supply circuit; The first motor is a dual-winding three-phase motor, which can be driven by electrical power converted to AC by the first inverter, and can also be driven by electrical power converted to AC by the second inverter. The control method of the power supply system is characterized by the following: When the DC power supply from the first power generation device to the first power supply circuit is cut off, a first power suppression control is performed on the first inverter, and a first power increase control is performed on the second inverter, wherein... The first power suppression control refers to controlling the ratio of the first power supplied from the first inverter to the first motor to the power consumption of the first motor, i.e., the first ratio, to be smaller than before the DC power supply from the first power generation device to the first power supply circuit is cut off. The first power increase control refers to controlling the ratio of the second power supplied from the second inverter to the first motor relative to the power consumption of the first motor, i.e., the second ratio control, to be greater than before the DC power supply from the first power generation device to the first power supply circuit was cut off.

9. A computer program product, characterized in that, A control method for enabling a computer to execute the power supply system of claim 8.

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