Charging System

Abstract

A charging system (10) for charging a battery (BAT) mounted on a vehicle (V) is provided with: an inverter (11) for converting electric power supplied from a commercial power supply (PS); a flywheel (12) for storing kinetic energy; and a motor generator (13) electrically connected to the inverter (11) and mechanically connected to the flywheel (12).

Description

[Technical field]

[0001] The present invention relates to a charging system for charging an electricity storage device mounted on a mobile object. [Background technology]

[0002] In recent years, electric vehicles equipped with large-capacity batteries have been developed. Although these electric vehicles have a long driving range, they have an issue of taking a long time to charge, so development of rapid charging is underway.

[0003] To realize rapid charging, if high voltage electricity (for example, 6600V) is drawn from a commercial power source, a high voltage receiving facility (cubicle) is required, which is a large burden in terms of size and cost. Also, if it is attempted to store the same amount of energy as an existing gas station, the required land area would be extremely large, which is not realistic.

[0004] Therefore, Patent Document 1 proposes using a flywheel as an energy storage device to store kinetic energy instead of electrical energy. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japan Utility Model Publication No. 61-43735 Summary of the Invention [Problem to be solved by the invention]

[0006] However, there is room for improvement when attempting to commercially utilize the technology described in Patent Document 1.

[0007] The present invention provides a charging system that enables efficient charging in a limited space. [Means for solving the problem]

[0008] The present invention relates to A charging system for charging a power storage device mounted on a moving object, comprising: A power conversion device that converts power supplied from a commercial power source; A kinetic energy storage device that stores kinetic energy; a rotating electric machine electrically connected to the power conversion device and mechanically connected to the kinetic energy storage device; Preparation, the kinetic energy storage device and the rotating electric machine constitute a kinetic energy storage unit, the charging system includes a plurality of the kinetic energy storage units; A plurality of the rotating electric machines are electrically connected in parallel to the power conversion device, A control device for controlling the power conversion device includes: before starting to store kinetic energy in the kinetic energy storage device by the plurality of rotating electric machines, A phase matching control is performed to match the rotation phases of the rotors of the plurality of rotating electric machines. . The present invention also provides a method for producing a method for manufacturing a semiconductor device comprising the steps of: A charging system for charging a power storage device mounted on a moving object, comprising: A power conversion device that converts power supplied from a commercial power source; A kinetic energy storage device that stores kinetic energy; a rotating electric machine electrically connected to the power conversion device and mechanically connected to the kinetic energy storage device, the kinetic energy storage device and the rotating electric machine constitute a kinetic energy storage unit, the charging system includes a plurality of the kinetic energy storage units; A plurality of the rotating electric machines are electrically connected in parallel to the power conversion device, The charging system includes: a boost converter electrically connected in parallel to the plurality of rotating electric machines and configured to boost electric power supplied from the plurality of rotating electric machines; a control device that controls the power conversion device and variably controls a switching frequency of the boost converter; The control device obtains the number of the plurality of rotating electric machines connected to the boost converter, and switches the switching frequency based on the number of the plurality of rotating electric machines. The present invention also provides a method for producing a method for manufacturing a semiconductor device comprising the steps of: A charging system for charging a power storage device mounted on a moving object, comprising: A power conversion device that converts power supplied from a commercial power source; A kinetic energy storage device that stores kinetic energy; a rotating electric machine electrically connected to the power conversion device and mechanically connected to the kinetic energy storage device, the kinetic energy storage device and the rotating electric machine constitute a kinetic energy storage unit, the charging system includes a plurality of the kinetic energy storage units; A plurality of the rotating electric machines are electrically connected in parallel to the power conversion device, The charging system includes: a boost converter electrically connected in parallel to the plurality of rotating electric machines and configured to boost electric power supplied from the plurality of rotating electric machines; a control device that controls the power conversion device variably controls a switching frequency of the boost converter in accordance with the number of the rotating electric machines; The control device switches the switching frequency based on an input / output voltage and a current of the boost converter. The present invention also provides a method for producing a method for manufacturing a semiconductor device comprising the steps of: A charging system for charging a power storage device mounted on a moving object, comprising: A power conversion device that converts power supplied from a commercial power source; A kinetic energy storage device that stores kinetic energy; a rotating electric machine electrically connected to the power conversion device and mechanically connected to the kinetic energy storage device, the kinetic energy storage device and the rotating electric machine constitute a kinetic energy storage unit, the charging system includes a plurality of the kinetic energy storage units; A plurality of the rotating electric machines are electrically connected in parallel to the power conversion device, The charging system includes: a boost converter electrically connected in parallel to the plurality of rotating electric machines and configured to boost electric power supplied from the plurality of rotating electric machines; a control device that controls the power conversion device and variably controls a switching frequency of the boost converter; The control device switches the switching frequency in accordance with the number of the plurality of rotating electric machines so that a ripple current becomes equal to or smaller than a predetermined value. Effect of the Invention

[0009] According to the present invention, by storing the electricity supplied from a commercial power source as kinetic energy using a kinetic energy storage device, it is possible to appropriately preserve energy in a limited space compared to storing electrical energy, and to efficiently charge a storage device installed in a moving object. [Brief description of the drawings]

[0010] [Figure 1] 1 is a functional block diagram of a charging system according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is an electric circuit diagram of the first power conversion device of FIG. [Diagram 3] 2 is an electric circuit diagram of the second power conversion device of FIG. 1. [Figure 4] 2 is a functional block diagram of a charging station in which a plurality of the charging systems shown in FIG. 1 are provided. [Diagram 5] 2 is a graph showing the change in charging power and the kinetic energy loading rate of a flywheel over time in the charging system of FIG. 1. [Figure 6] FIG. 5 is a functional block diagram of a charging system according to a second embodiment of the present invention. [Figure 7A] FIG. 7 is a diagram showing the flow of electricity in the charging system of FIG. 6 when the kinetic energy charging rate of the flywheel is less than full. [Figure 7B] FIG. 7 is a diagram showing the flow of electricity in the charging system of FIG. 6 when the kinetic energy charging rate of the flywheel is full. [Figure 8] FIG. 11 is a functional block diagram of a charging system according to a third embodiment of the present invention. [Figure 9A] 9 is a diagram showing an electric flow during phase matching control in the charging system of FIG. 8. FIG. [Figure 9B] 9 is a diagram showing the flow of electricity in the charging system of FIG. 8 when the kinetic energy charging rate of the flywheel is less than full charge. [Figure 10] 9 is a diagram illustrating the phases of a plurality of motor generators before and after the phase matching control of FIG. 8. [Figure 11] 9 is a graph illustrating a current application method for the phase matching control in FIG. 8. [Figure 12] 12 is a graph for more specifically explaining the current application method of FIG. 11. [Figure 13] 1 is a graph illustrating the relationship between the number of motor generators and a current peak value at a predetermined frequency (fixed frequency). [Figure 14] 10 is a graph illustrating the relationship between the number of motor generators and the current peak value at a frequency (variable frequency) that is appropriately set according to the number of motor generators. [Figure 15] 11 is a graph illustrating the difference in current peak and ripple current when the switching period is constant (fixed frequency) and when the switching period is switched (variable frequency). [Figure 16] FIG. 11 is a functional block diagram of a charging system according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, embodiments of a charging system of the present invention will be described with reference to the drawings.

[0012] First Embodiment 1, the charging system 10 is a charging system that charges a battery BAT mounted on a vehicle V, which is a moving body. The vehicle V may be any vehicle equipped with a battery BAT, such as a hybrid vehicle, a plug-in hybrid vehicle, an electric vehicle, or a fuel cell vehicle.

[0013] The charging system 10 includes an inverter 11 that converts power supplied from a commercial power source PS, a flywheel 12 that stores kinetic energy, a motor generator 13 electrically connected to the inverter 11 and mechanically connected to the flywheel 12, a quick charger 14 electrically connected to the motor generator 13 and supplies power to a battery BAT of the vehicle V, and a control device 16 that controls the inverter 11 and the quick charger 14. The flywheel 12 and the motor generator 13 constitute a kinetic energy storage unit 15.

[0014] The voltage of the power supplied from the commercial power source PS (hereinafter referred to as the input power) is preferably an AC voltage of 100V or more and 500V or less, for example, AC 200V in a three-phase three-wire system. If the voltage of the input power is high, a dedicated power receiving facility such as a high-voltage power receiving facility (cubicle) is required, but if the voltage of the input power is low, a special power receiving facility such as a high-voltage power receiving facility (cubicle) is not required. In addition, if the voltage of the input power is low, a large site for installing the high-voltage power receiving facility (cubicle) is not required, and the introduction cost can be reduced. Note that, if there is sufficient site space, a high-voltage power receiving facility (cubicle) capable of receiving an AC voltage of 6600V and a power of 100kW to 500kW may be installed.

[0015] 2, the inverter 11 includes a first inverter unit INV1 that converts three-phase AC power (hereinafter sometimes referred to as first three-phase AC power) that is the input power into DC power, and a second inverter unit INV2 that converts the DC power converted by the first inverter unit INV1 into three-phase AC power (hereinafter sometimes referred to as second three-phase AC power) that is different from the first three-phase AC power and is suitable for driving the motor generator 13. The first inverter unit INV1 and the second inverter unit INV2 have the same structure and are connected in series with a first smoothing capacitor 21 in between.

[0016] Each of the first inverter section INV1 and the second inverter section INV2 includes a bridge circuit formed by a plurality of switching elements that are bridge-connected. For example, the switching elements are transistors such as IGBTs (Insulated Gate Bipolar Transistors) or MOSFETs (Metal Oxide Semiconductor Field Effect Transistors). For example, in the bridge circuit, a pair of high-side arm and low-side arm U-phase transistors UH, UL, a pair of high-side arm and low-side arm V-phase transistors VH, VL, and a pair of high-side arm and low-side arm W-phase transistors WH, WL are each bridge-connected.

[0017] The collectors of the high-side arm transistors UH, VH, and WH are connected to a positive terminal PI to form a high-side arm. In each phase, the positive terminals PI of the high-side arms are connected to a positive connection line 50p.

[0018] The emitters of the low-side arm transistors UL, VL, and WL are connected to a negative terminal NI to form a low-side arm. In each phase, the negative terminals NI of the low-side arms are connected to a negative connection line 50n.

[0019] In each phase, the emitters of the transistors UH, VH, and WH of the high-side arm are connected to the collectors of the transistors UL, VL, and WL of the low-side arm at a connection point TI.

[0020] A connection point TI in each phase of the first inverter section INV1 is connected to the commercial power supply PS by a first connection line 51. A connection point TI in each phase of the second inverter section INV2 is connected to the motor generator 13 by a second connection line 52.

[0021] The bridge circuit includes diodes connected in the forward direction from the emitter to the collector between the collector and emitter of each of the transistors UH, UL, VH, VL, WH, and WL.

[0022] Each of the first inverter unit INV1 and the second inverter unit INV2 switches the transistor pairs of each phase on (conducting) / off (blocking) based on a gate signal, which is a switching command input to the gate of each of the transistors UH, VH, WH, UL, VL, and WL. The first inverter unit INV1 converts first three-phase AC power input from the commercial power source PS into DC power, and the second inverter unit INV2 converts the DC power input from the first inverter unit INV1 into second three-phase AC power.

[0023] The first smoothing capacitor 21 smoothes voltage fluctuations that occur with the on / off switching operations of the transistors UH, UL, VH, VL, WH, and WL of the first inverter section INV1 and the second inverter section INV2.

[0024] The motor generator 13 is a three-phase AC motor generator. When charging with energy, the motor generator 13 rotates the flywheel 12 by using the power input from the inverter 11 to perform power running. When charging the battery, the motor generator 13 performs regenerative running to convert the kinetic energy of the flywheel 12 into electrical energy, and supplies the power to the quick charger 14.

[0025] 3, the quick charger 14 includes a third inverter unit INV3 that converts three-phase AC power generated by the motor generator 13 into DC power, a fourth inverter unit INV4 that converts the DC power converted by the third inverter unit INV3 into single-phase AC power, a high-frequency transformer 31 that transforms the single-phase AC power input from the fourth inverter unit INV4, and a fifth inverter INV5 that converts the single-phase AC power input from the high-frequency transformer 31 into DC power. A second smoothing capacitor 32 is provided between the third inverter unit INV3 and the fourth inverter unit INV4, and a third smoothing capacitor 33 is provided downstream of the fifth inverter INV5. The fourth inverter unit INV4, the high-frequency transformer 31, and the fifth inverter INV5 constitute a boost converter 17 that boosts the power supplied from the motor generator 13 when charging the battery.

[0026] The control device 16 performs switching control of the first inverter section INV1 and the second inverter section INV2 of the inverter 11, and switching control of the third inverter section INV3, the fourth inverter section INV4, and the fifth inverter section INV5 of the quick charger 14, thereby charging the flywheel 12 with energy and charging the battery BAT installed in the vehicle V.

[0027] The charging system 10 configured in this manner may be installed in car dealerships, convenience stores, supermarkets, and the like. The flywheel 12 accumulates kinetic energy until the flywheel 12 is fully charged by being driven by the motor generator 13 that receives power supplied from the commercial power source PS via the inverter 11. The charging system 10 having the flywheel 12 that is fully charged may be recognized by a user (driver) of the vehicle V through a car navigation system or a mobile terminal such as a smartphone. As shown in FIG. 4, two charging systems 10 may be provided in one charging station, or three or more charging systems 10 may be provided. When the user needs to charge the vehicle V, the user can stop by any of the nearby charging systems 10 that are fully charged, thereby charging the battery BAT mounted on the vehicle V. This shortens or eliminates waiting time.

[0028] Each charging system 10 only needs to be able to supply the energy required to charge the battery BAT of one vehicle. Here, the vehicle V is assumed to be an electric vehicle with a driving range of 500 km. To ensure a range of 500 km, the battery BAT needs to have an electric energy of about 50 kWh. If the output of the quick charger 14 is 3 MW, this electric vehicle can be fully charged in about one minute, the same as an existing gasoline vehicle. If the output of the inverter 11 is about 50 kW, the installation space for the inverter 11 is 0.5 m 3 If the energy storage capacity of the flywheel 12 is 50 kWh, the installation space for the flywheel 12 needs to be 1.4 m 3 If the output of the quick charger 14 is 3 MW, the installation space for the quick charger 14 must be 3 m 3 If the output of the inverter 11 is 50 kW, the flywheel 12 with an energy storage capacity of 50 kWh can be fully charged in about 60 minutes.

[0029] FIG. 5 is a graph showing the change in charging power (kW: left vertical axis) of quick charger 14 and the kinetic energy filling rate (%: right vertical axis) of flywheel 12 over time (min: horizontal axis) assuming that the voltage of the input power is AC 200V, the output of inverter 11 is 50kW, the output of quick charger 14 is 3MW, and the energy storage amount of flywheel 12 is 50kWh.

[0030] According to Fig. 5, since the introduced power is low voltage, it takes a certain time to fully charge the kinetic energy of the flywheel 12, but charging is completed in an extremely short time. Therefore, the user can charge the vehicle V in the same time as an existing gasoline vehicle. Note that it is not preferable to completely stop the flywheel 12 during charging, and it is preferable to complete charging when the kinetic energy charging rate reaches, for example, 3 to 5%.

[0031] As described above, the charging system 10 of the present embodiment can be installed in a relatively small space, so that the degree of freedom in installation is high and many charging stations can be provided to users.

[0032] <Second embodiment> Next, a charging system 10 according to a second embodiment of the present invention will be described with reference to FIG. In the charging system 10 of the second embodiment, a solar cell 40 is electrically connected to the inverter 11 as an auxiliary power source in the charging system 10 of the first embodiment. In this embodiment and other embodiments described below, the same components as those in the charging system 10 of the first embodiment are denoted by the same reference numerals and description thereof will be omitted.

[0033] In the charging system 10 of this embodiment, a solar cell 40 is electrically connected to an inverter 11 as an auxiliary power source via an auxiliary power source inverter 41, and the charging system 10 is configured to be able to use the power generated by the solar cell 40 as needed. The auxiliary power source inverter 41 converts the DC power generated by the solar cell 40 into three-phase AC power. In Figures 7A and 7B, the solid arrows indicate AC power, and the dotted arrows indicate DC power (similarly in Figure 9).

[0034] Specifically, when the flywheel 12 is not in a full charge state, as shown in FIG. 7A, the electric power generated by the solar cell 40 is supplied to the motor generator 13 via the inverter 11 in addition to the electric power supplied from the commercial power source PS, and the motor generator 13 receives these electric powers and drives them to store kinetic energy in the flywheel 12 until the flywheel 12 is in a full charge state. On the other hand, when the flywheel 12 is in a full charge state, as shown in FIG. 7B, the electric power generated by the solar cell 40 can be sold via the power path of the commercial power source PS. This makes it possible to effectively utilize natural energy and reduce the economic burden on the operator of the charging system 10. The auxiliary power source is not limited to the solar cell 40, and may be wind power generation, geothermal power generation, wave power generation, or the like.

[0035] <Third embodiment> Next, a charging system 10 according to a third embodiment of the present invention will be described with reference to FIG. In the charging system 10 of the first embodiment, one kinetic energy storage unit 15 consisting of a flywheel 12 and a motor generator 13 is provided, whereas in the charging system 10 of the third embodiment, multiple kinetic energy storage units 15 are provided between the inverter 11 and the rapid charger 14.

[0036] More specifically, in the charging system 10 of this embodiment, a plurality of (e.g., eight) motor generators 13 are electrically connected in parallel between the inverter 11 and the quick charger 14. Each motor generator 13 constitutes a kinetic energy storage unit 15, and a flywheel 12 is connected to each motor generator 13. When a plurality of motor generators 13 are driven by one inverter 11, it is necessary to match the phases of all the motor generators 13. Therefore, before driving all the motor generators 13, as shown in FIG. 9A, a phase matching control is executed in advance to pass a direct current through all the motor generators 13 for a predetermined time. This phase matching control makes it possible to attract all the motor generators 13 to any position, and as a result, it is possible to match the phases of all the motor generators 13.

[0037] Here, the phase matching control will be described more specifically with reference to Fig. 10 to Fig. 12. Fig. 10 to Fig. 12 show an example in which n (n is an integer equal to or greater than 1) motor generators 13 are electrically connected in parallel to the inverter 11. M / Gn is the nth motor generator 13, nR is the R-phase coil of the nth motor generator 13, nS is the S-phase coil of the nth motor generator 13, and nT is the T-phase coil of the nth motor generator 13. In Fig. 10 to Fig. 12, the three phases of the three-phase AC power are the R-phase, S-phase, and T-phase, which are synonymous with the U-phase, V-phase, and W-phase in Fig. 2.

[0038] As shown on the left side of FIG. 10, when the rotor phases of the motor generators 13 (M / G1, M / G2, . . . M / Gn) are different, the rotors of the motor generators 13 (M / G1, M / G2, . . . M / Gn) do not rotate properly even if the AC current output from the inverter 11 is applied as it is. Therefore, as shown in FIG. 11, an instantaneous value of a three-phase AC current (in the example of FIG. 11, the R-phase current is a zero-phase value) is DC-conducted to the S-phase and the T-phase. At this time, as shown in FIG. 12, it is preferable to perform DC current intermittently by repeating energization (ON) and stop (OFF) for a predetermined period. By applying torque intermittently to at least some of the phases in this way, a gentle reaction force acts on the rotor when the torque is released, and the phase alignment operation of the rotor is promoted. The phase alignment control is not limited to the case where DC current is performed to the remaining two phases of the three phases when any one of the three phases is zero phase, but may be performed to all three phases.

[0039] After the phase matching operation shown on the right side of FIG. 10 is completed, as shown in FIG. 9B and FIG. 12, AC power can be supplied to all of the motor generators 13, thereby charging all of the flywheels 12 with kinetic energy.

[0040] When multiple motor generators 13 are electrically connected in parallel to quick charger 14, the inductance of boost converter 17 during charging changes depending on the number of motor generators 13. When the number n of motor generators 13 increases, the effective current value becomes n times larger, and since the inductance becomes 1 / n, the peak value of the ripple current becomes n times larger. Therefore, since the current peak is the sum of the effective current value and the peak value of the ripple current (hereinafter simply referred to as ripple current), it becomes n times larger when the number n of motor generators 13 increases. When the current peak becomes larger, it is necessary to use high-voltage components, which leads to higher costs for boost converter 17.

[0041] For example, assuming that from 1 to 8 motor generators 13 can be connected, when the voltage is constant, the time during which the current rises during one ON time will be 1 to 8 times, and the ripple current will also be 1 to 8 times. Figure 15 is a graph showing the relationship between the number of motor generators 13 and the current peak and ripple current.

[0042] Here, it is preferable that the control device 16 variably controls the switching period of the boost converter 17. FIG. 13 shows the current when the control device 16 controls the boost converter 17 at a constant switching frequency regardless of the number of motor generators 13 electrically connected in parallel to the quick charger 14. In the figure, 1 to 8 indicate the number of motor generators 13. Furthermore, the fluctuations in the current value are due to the fluctuations in the ripple current, and the current peak is the value when the ripple current has a peak value. From FIG. 13, when the switching frequency is constant regardless of the number of motor generators 13, the effective current value increases as the number of motor generators 13 increases, and further, the ripple current also increases as the number of motor generators 13 increases, resulting in a larger current peak.

[0043] In contrast, Fig. 14 shows the current peak when the switching frequency is set appropriately according to the number of motor generators 13 electrically connected in parallel to quick charger 14, and boost converter 17 is controlled at the set switching period. In the example of Fig. 14, the switching frequency is set so that the ripple current is a constant value regardless of the number of motor generators 13. According to this, although the effective current value increases as the number of motor generators 13 increases, the current peak is smaller because the ripple current is a constant value. Note that the ripple current does not need to be a constant value, and the switching frequency may be set so that the ripple current is equal to or less than a predetermined value.

[0044] In this way, by the control device 16 switching the switching frequency of the boost converter 17 according to the number of motor generators 13 so that the ripple current is below a predetermined value, the current peak can be reduced and the cost of the boost converter 17 can be prevented from increasing.

[0045] If the control device 16 does not know the number of motor generators 13 electrically connected in parallel to the quick charger 14 when the operation of the boost converter 17 starts, the boost converter 17 can be operated at a predetermined switching period and the number of motor generators 13 can be obtained from the slope of the input / output voltage and current of the boost converter 17. The relationship between the slope of the input / output voltage and current of the boost converter 17 and the number of motor generators 13 may be measured in advance and stored as a table, or may be calculated as appropriate.

[0046] The control device 16 may obtain the number of motor generators 13 from the slope of the input / output voltage and current of the boost converter 17 and switch the switching frequency based on the obtained number of motor generators 13, or may switch the switching frequency directly from the slope of the input / output voltage and current of the boost converter 17.

[0047] FIG. 15 shows the current peak and ripple current when the switching period is constant (fixed frequency) and the current peak and ripple current when the switching period is switched (variable frequency). As is clear from FIG. 15, by switching the switching frequency based on the number of motor generators 13, the current peak of the boost converter 17 can be suppressed.

[0048] <Fourth embodiment> Next, a charging system 10 according to a fourth embodiment of the present invention will be described with reference to FIG. In the charging system 10 of the first embodiment, one set of the inverter 11, the kinetic energy storage unit 15, and the quick charger 14 (hereinafter, this set of the inverter 11, the kinetic energy storage unit 15, and the quick charger 14 may be referred to as the charging unit 18) is configured to be capable of supplying the energy required to charge the battery BAT of one vehicle, but in the charging system 10 of the fourth embodiment, three sets of the charging units 18 are configured to be capable of supplying the energy required to charge the battery BAT of one vehicle. This allows the inverter 11, the kinetic energy storage unit 15, and the quick charger 14 to be each miniaturized.

[0049] Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present invention. Furthermore, the components in the above-mentioned embodiments may be arbitrarily combined within the scope of the invention.

[0050] For example, although a vehicle is exemplified as a moving body, the moving body is not limited to this, and may be an air vehicle. Therefore, the power storage device mounted on the moving body may be a power storage device mounted on an air vehicle.

[0051] This specification also describes at least the following items. Note that, in parentheses, components corresponding to those in the above-mentioned embodiment are shown, but the present invention is not limited to these.

[0052] (1) A charging system (charging system 10) that charges a power storage device (battery BAT) mounted on a moving body (vehicle V), A power conversion device (inverter 11) that converts power supplied from a commercial power source (commercial power source PS); A kinetic energy storage device (flywheel 12) that stores kinetic energy; a rotating electric machine (motor generator 13) electrically connected to the power conversion device and mechanically connected to the kinetic energy storage device;

[0053] According to (1), by storing the electricity supplied from a commercial power source as kinetic energy using a kinetic energy storage device, energy can be appropriately stored in a limited space compared to the case of storing electrical energy, and the storage device installed in the vehicle can be efficiently charged.

[0054] (2) A charging system according to (1), A charging system, wherein the voltage of the power supplied from the commercial power source is 100V or more and 300V or less.

[0055] According to (2), the voltage of the power supplied from commercial power sources is between 100V and 300V, so there is no need for special power receiving equipment such as a high-voltage power receiving equipment (cubicle). This means that the site required to install the charging system can be small, and installation costs can be reduced.

[0056] (3) A charging system according to (1) or (2), The charging system includes the power conversion device including a first power conversion unit (first inverter unit INV1) that converts a first AC power supplied from the commercial power source into DC power, and a second power conversion unit (second inverter unit INV2) that converts the DC power into a second AC power different from the first AC power.

[0057] According to (3), a highly versatile power conversion device can be used.

[0058] (4) A charging system according to any one of (1) to (3), The kinetic energy storage device and the rotating electric machine constitute a kinetic energy storage unit (kinetic energy storage unit 15), the charging system includes a plurality of the kinetic energy storage units; a charging system in which a plurality of the rotating electric machines are electrically connected in parallel to the power conversion device.

[0059] According to (4), since a plurality of rotating electric machines are connected in parallel to the power conversion device, the charging system can be made smaller than when a power conversion device is connected to each of the rotating electric machines.

[0060] (5) A charging system according to (4), A control device (control device 16) that controls the power conversion device includes: before starting to store kinetic energy in the kinetic energy storage device by the plurality of rotating electric machines, A charging system that performs phase alignment control to align the rotational phases of rotors of the multiple rotating electric machines.

[0061] According to (5), even when a plurality of rotating electric machines are connected in parallel to the power conversion device, the plurality of rotating electric machines can be appropriately controlled by phase matching control.

[0062] (6) A charging system according to (5), The phase matching control is performed to control so that direct current flows through at least a portion of the multiple phases.

[0063] According to (6), even if the rotor phases of a plurality of rotating electrical machines are different, the rotor phases can be aligned.

[0064] (7) A charging system according to (6), A charging system in which the phase matching control executes the DC current intermittently.

[0065] According to (7), by applying torque intermittently to each phase, a gentle reaction force acts on the rotor when the torque is released, promoting the rotor phase alignment operation.

[0066] (8) A charging system according to (6) or (7), the plurality of rotating electric machines are three-phase AC rotating electric machines, The phase matching control executes the DC current flow to the remaining two phases of the three phases when any one of the three phases is a zero phase.

[0067] According to (8), phase matching control can be easily performed.

[0068] (9) A charging system according to any one of (4) to (8), The charging system includes: The power supply system further includes a boost converter (boost converter 17) electrically connected in parallel with the plurality of rotating electric machines and configured to boost the electric power supplied from the plurality of rotating electric machines, A charging system, wherein a control device (control device 16) that controls the power conversion device variably controls a switching frequency of the boost converter.

[0069] According to (9), the current peak can be reduced, and the cost of the boost converter can be prevented from increasing.

[0070] (10) A charging system according to (9), The control device obtains the number of the plurality of rotating electric machines connected to the boost converter, and switches the switching frequency based on the number of the plurality of rotating electric machines.

[0071] According to (10), the current peak can be reduced by switching the switching frequency according to the number of multiple rotating electrical machines.

[0072] (11) A charging system according to (10), The control device obtains the number of the plurality of rotating electric machines based on an input / output voltage and a current of the boost converter.

[0073] According to (11), the number of the rotating electric machines can be obtained based on the input / output voltages and currents of the boost converter.

[0074] (12) A charging system according to (9), The control device switches the switching frequency based on an input / output voltage and a current of the boost converter.

[0075] According to (12), the current peak can be reduced by switching the switching frequency based on the input / output voltage and current of the boost converter.

[0076] (13) A charging system according to any one of (9) to (12), The control device switches the switching frequency depending on the number of the plurality of rotating electric machines so that a ripple current is equal to or less than a predetermined value.

[0077] According to (13), the ripple current is kept below a predetermined value, so that the current peak and its fluctuation range can be reduced.

[0078] (14) A charging system according to any one of (1) to (13), A charging system, wherein an auxiliary power source (solar cell 40) is electrically connected to the power conversion device.

[0079] According to (14), by electrically connecting an auxiliary power source such as a solar cell to the power conversion device, natural energy can be effectively utilized.

[0080] This application is based on a Japanese patent application (Patent Application No. 2019-184710) filed on October 7, 2019, the contents of which are incorporated by reference into this application. [Explanation of symbols]

[0081] 10 Charging System 11 Inverter (power conversion device) 12 Flywheel (kinetic energy storage device) 13 Motor generator (rotating electric machine) 15 Kinetic Energy Storage Unit 40 Solar battery (auxiliary power source) INV1 First inverter section (first power conversion section) INV2 Second inverter section (second power conversion section) V Vehicle PS commercial power supply

Claims

1. A charging system for charging a power storage device mounted on a moving object, comprising: A power conversion device that converts power supplied from a commercial power source; A kinetic energy storage device that stores kinetic energy; a rotating electric machine electrically connected to the power conversion device and mechanically connected to the kinetic energy storage device, the kinetic energy storage device and the rotating electric machine constitute a kinetic energy storage unit, the charging system includes a plurality of the kinetic energy storage units; A plurality of the rotating electric machines are electrically connected in parallel to the power conversion device, A control device for controlling the power conversion device includes: before starting to store kinetic energy in the kinetic energy storage device by the plurality of rotating electric machines, A charging system that performs phase alignment control to align the rotational phases of rotors of the multiple rotating electric machines.

2. 2. The charging system according to claim 1, A charging system, wherein the voltage of the power supplied from the commercial power source is 100V or more and 300V or less.

3. 3. The charging system according to claim 1, The charging system includes a first power conversion unit that converts a first AC power supplied from the commercial power source into a DC power, and a second power conversion unit that converts the DC power into a second AC power different from the first AC power.

4. A charging system according to any one of claims 1 to 3, The phase matching control is performed to control so that direct current flows through at least a portion of the multiple phases.

5. The charging system according to claim 4, A charging system in which the phase matching control executes the DC current intermittently.

6. The charging system according to claim 4 or 5, the plurality of rotating electric machines are three-phase AC rotating electric machines, The phase matching control executes the DC current flow to the remaining two phases of the three phases when any one of the three phases is a zero phase.

7. The charging system according to any one of claims 1 to 6, The charging system includes: a boost converter electrically connected in parallel to the plurality of rotating electric machines and configured to boost electric power supplied from the plurality of rotating electric machines; A charging system, wherein a control device that controls the power conversion device variably controls a switching frequency of the boost converter depending on the number of the rotating electric machines.

8. A charging system for charging a power storage device mounted on a moving object, comprising: A power conversion device that converts power supplied from a commercial power source; A kinetic energy storage device that stores kinetic energy; a rotating electric machine electrically connected to the power conversion device and mechanically connected to the kinetic energy storage device, the kinetic energy storage device and the rotating electric machine constitute a kinetic energy storage unit, the charging system includes a plurality of the kinetic energy storage units; A plurality of the rotating electric machines are electrically connected in parallel to the power conversion device, The charging system includes: a boost converter electrically connected in parallel to the plurality of rotating electric machines and configured to boost electric power supplied from the plurality of rotating electric machines; a control device that controls the power conversion device and variably controls a switching frequency of the boost converter; The control device obtains the number of the plurality of rotating electric machines connected to the boost converter, and switches the switching frequency based on the number of the plurality of rotating electric machines.

9. 9. The charging system according to claim 8, The control device obtains the number of the plurality of rotating electric machines based on an input / output voltage and a current of the boost converter.

10. A charging system for charging a power storage device mounted on a moving object, comprising: A power conversion device that converts power supplied from a commercial power source; A kinetic energy storage device that stores kinetic energy; a rotating electric machine electrically connected to the power conversion device and mechanically connected to the kinetic energy storage device, the kinetic energy storage device and the rotating electric machine constitute a kinetic energy storage unit, the charging system includes a plurality of the kinetic energy storage units; A plurality of the rotating electric machines are electrically connected in parallel to the power conversion device, The charging system includes: a boost converter electrically connected in parallel to the plurality of rotating electric machines and configured to boost electric power supplied from the plurality of rotating electric machines; a control device that controls the power conversion device variably controls a switching frequency of the boost converter in accordance with the number of the rotating electric machines; The control device switches the switching frequency based on an input / output voltage and a current of the boost converter.

11. A charging system for charging a power storage device mounted on a moving object, comprising: A power conversion device that converts power supplied from a commercial power source; A kinetic energy storage device that stores kinetic energy; a rotating electric machine electrically connected to the power conversion device and mechanically connected to the kinetic energy storage device, the kinetic energy storage device and the rotating electric machine constitute a kinetic energy storage unit, the charging system includes a plurality of the kinetic energy storage units; A plurality of the rotating electric machines are electrically connected in parallel to the power conversion device, The charging system includes: a boost converter electrically connected in parallel to the plurality of rotating electric machines and configured to boost electric power supplied from the plurality of rotating electric machines; a control device that controls the power conversion device and variably controls a switching frequency of the boost converter; The control device switches the switching frequency depending on the number of the plurality of rotating electric machines so that a ripple current is equal to or less than a predetermined value.

12. The charging system according to any one of claims 1 to 11, A charging system, wherein an auxiliary power source is electrically connected to the power conversion device.

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