JP2021090258A - Electric power system and power supply device - Google Patents

Abstract

To provide an electric power system and a power supply device capable of efficiently supplying power to a load by using a system power supply and a specific power supply.SOLUTION: An electric power system 10 includes a system power supply 12, a power storage device 22 as a specific power supply provided separately from the system power supply 12, and a vehicle 11 as a load to which power supply is performed by the system power supply 12 and the power storage device 22. The electric power system 10 includes a first DC/DC converter 31 as a first variable part that changes a first supply power Pout1, which is the power supplied to a vehicle 11, by using the system power supply 12, a second DC/DC converter 32 as a second variable part that changes a second supply power Pout2, which is the power supplied to the vehicle 11, by using the power storage device 22, and a control unit 50.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power system and a power supply device.

For example, Patent Document 1 describes a power system in which a storage battery as a specific power source and a distributed power source are systematically connected to a power system as a system power source. In the power system, the power output from the storage battery and the distributed power source is converted into system power and output to the power system, and is supplied to the load as system power.

JP-A-2019-68618

Here, in the configuration in which the power output from the specific power supply is converted into the system power and supplied to the system power supply, a loss may occur when the power output from the specific power supply is converted into the system power. In addition, depending on the status of the grid power supply such as a contract with an electric power company, it may not be possible to supply sufficient power to the load.

On the other hand, the inventor of the present application does not convert the power output from the specific power supply into the system power supply and supply it to the system power supply, but supplies power to the load from both the system power supply and the specific power supply. We focused on the configuration. When power is supplied using such a system power supply and a specific power supply, there is a concern that the efficiency may decrease depending on the power supplied from the system power supply or the power supplied from the specific power supply.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power system and a power supply device capable of efficiently supplying power to a load by using a system power supply and a specific power supply. Is.

The power system that achieves the above object is the system power supply, a specific power supply provided separately from the system power supply, a load for which power is supplied using the system power supply and the specific power supply, and the system power supply. A first variable unit that changes the first supply power that is the power supplied to the load, a second variable unit that changes the second supply power that is the power supplied to the load using the specific power supply, and the above. The control unit includes a control unit that controls the first variable unit and the second variable unit so that power is supplied to the load from both the system power supply and the specific power supply. Is the target power supply to be supplied to the load, the first efficiency which is the efficiency when power is supplied to the load by using the system power supply, and the case where power is supplied to the load by using the specific power supply. Based on the derivation parameters including the second efficiency, which is the efficiency, the derivation unit for deriving the first set power and the second set power, and the first supply power corresponding to the first set power are supplied to the load. A first power control unit that controls the first variable unit and a second variable unit that controls the second variable unit so that the second supply power corresponding to the second set power is supplied to the load. It is characterized by having two power control units.

According to such a configuration, the system power can be reduced with respect to the target power supply by supplying power to the load from both the system power supply and the specific power supply. As a result, power can be supplied to the load without requiring an excessively large system power. Therefore, even under the condition that the upper limit of the system power is set, the power can be suitably supplied to the load.

Further, the first set power and the second set power are derived by the derivation parameters including the first efficiency and the second efficiency. As a result, efficient power supply in consideration of both efficiencies can be performed, so that the loss associated with the power supply can be reduced as compared with the case where the power supply is performed only by the system power or the power supply is performed only by the specific power supply.

Regarding the power system, the specific power source is a power storage device charged by the system power supply, and the second efficiency may include the charging efficiency of the power storage device.
According to such a configuration, both set powers can be derived in consideration of the charging efficiency of the power storage device, and more efficient power supply can be performed as a whole.

With respect to the power system, the first efficiency fluctuates according to the first power supply, the second efficiency is lower than the first efficiency, and fluctuates according to the second power supply. The derivation unit is based on the derivation parameter so that the power supplied to the load becomes the target power supply and the total value of the first set power and the second set power becomes the minimum value. The first set power and the second set power may be derived.

According to this configuration, in a configuration in which the target power supply is supplied to the load by using the system power supply and the power storage device, the loss can be further reduced by deriving the combination of both set powers having the smallest loss. Can be done.

The power system includes an AC / DC inverter that converts system power output from the system power supply into DC power, and the first variable unit is provided between the AC / DC inverter and the load. It has a 1DC / DC converter, the second variable unit has a second DC / DC converter provided between the power storage device and the load, and the power system is a system power supply and the power storage device. In the connection state, the system power supply is connected to the load via the AC / DC inverter and the first DC / DC converter, and the power storage device is connected to the load via the second DC / DC converter. It is preferable that the system power supply is provided with a switching unit for switching to the first connection state or the second connection state in which the system power supply is connected to the power storage device via the AC / DC inverter and the second DC / DC converter.

According to such a configuration, by controlling the switching unit according to the situation, it is possible to supply electric power to the load and charge the power storage device by using the same AC / DC inverter.

Assuming that the power that can be supplied is the sum of the first maximum power that is the maximum power that can be supplied by the system power supply and the second maximum power that is the maximum power that can be supplied by the specific power supply for the power system. When the required power required from the load is equal to or greater than the supplyable power, the control unit sets the first set power and the second set power to the first maximum power and the second maximum power. The derived unit includes the first maximum power and the second maximum power, and the derived unit is based on the derived parameter when the required power is smaller than the supplyable power. Therefore, the first set power within a range not exceeding the first maximum power and the second set power within a range not exceeding the second maximum power may be derived.

According to such a configuration, when the required power is equal to or higher than the supplyable power, the first set power and the second set power are set to the first maximum power and the second maximum power. As a result, power corresponding to the power that can be supplied is supplied to the load. Therefore, when the required power is equal to or greater than the supplyable power, it is possible to supply power as close to the required power as possible while suppressing an excessive load on the system power supply or the specific power supply.

On the other hand, when the required power is smaller than the supplyable power, the first set power within the range not exceeding the first maximum power and the second set power within the range not exceeding the second maximum power are based on the derived parameters. 2 The set power is derived. As a result, efficient power supply can be performed within a range in which the first supply power and the second supply power do not exceed the first maximum power and the second maximum power.

Regarding the power system, the control unit changes the status of the system power supply or the status of the specific power supply in a situation where the system power supply and the specific power supply cooperate to supply power to the load. When the ratio changing condition including the above is satisfied, it is preferable that the ratio changing unit for changing the ratio between the first supply power and the second supply power is provided. According to such a configuration, it is possible to cope with fluctuations in the status of the system power supply and fluctuations in the status of the specific power supply during power supply to the load.

A power supply device that achieves the above object uses a system power supply and a specific power supply provided separately from the system power supply to supply power to a load, and uses the system power supply to supply power. A first variable unit that changes the first supply power that is the power supplied to the load, a second variable unit that changes the second supply power that is the power supplied to the load using the specific power supply, and the above. The control unit includes a control unit that controls the first variable unit and the second variable unit so that power is supplied to the load from both the system power supply and the specific power supply. Is the target power supply to be supplied to the load, the first efficiency which is the efficiency when power is supplied to the load by using the system power supply, and the case where power is supplied to the load by using the specific power supply. Based on the derivation parameters including the second efficiency, which is the efficiency, the derivation unit for deriving the first set power and the second set power, and the first supply power corresponding to the first set power are supplied to the load. A first power control unit that controls the first variable unit and a second variable unit that controls the second variable unit so that the second supply power corresponding to the second set power is supplied to the load. It is characterized by having two power control units.

According to such a configuration, the system power can be reduced with respect to the target power supply by supplying power to the load from both the system power supply and the specific power supply. As a result, power can be supplied to the load without requiring an excessively large system power. Therefore, even under the condition that the upper limit of the system power is set, the power can be suitably supplied to the load.

Further, the first set power and the second set power are derived by the derivation parameters including the first efficiency and the second efficiency. As a result, efficient power supply in consideration of both efficiencies can be performed, so that the loss associated with the power supply can be reduced as compared with the case where the power supply is performed only by the system power or the power supply is performed only by the specific power supply.

According to the present invention, power can be efficiently supplied to the load by using the system power supply and the specific power supply.

A block diagram showing the electrical configuration of a power system with a power supply. Flowchart of power supply control processing. The graph which shows the current dependence of the 1st efficiency and the 2nd efficiency.

Hereinafter, an embodiment of the power supply device and the power system will be described. In this embodiment, the power supply device is installed in a factory, a commercial facility, or the like. That is, the power system of this embodiment is for commercial or industrial use, not for household use.

As shown in FIG. 1, the power system 10 includes a vehicle 11, a system power supply 12, and a power supply device 20.
The vehicle 11 has a vehicle power storage device 11a. The specific configuration of the vehicle power storage device 11a is arbitrary, for example, a secondary battery or an electric double layer capacitor. The vehicle 11 may be a passenger car or an industrial vehicle such as a forklift.

The power supply device 20 has a connector 21 that can be electrically connected to the vehicle 11. By connecting the connector 21 to the vehicle 11, the power supply device 20 and the vehicle power storage device 11a are electrically connected.

That is, it can be said that the load (vehicle 11) of the present embodiment is detachably connected to the power supply device 20. In this case, it can be said that the power supply device 20 has a connector 21 as a connection portion for connecting the vehicle 11.

In the present embodiment, the power supply device 20 has a plurality of connectors 21 connected in parallel to each other, and can be connected to the plurality of vehicles 11 at the same time. Therefore, the power supply device 20 can supply power to a plurality of vehicles 11 at the same time. However, the number of connectors 21 is arbitrary and may be one.

The power supply device 20 is electrically connected to the system power supply 12, and the system power P0 is supplied to the power supply device 20. Further, the power supply device 20 has a power storage device 22 as a specific power source. The power supply device 20 is configured to supply power to the vehicle 11 (specifically, the vehicle power storage device 11a) as a load by using both the system power supply 12 and the power storage device 22. The power storage device 22 is arbitrary as long as it can be charged and discharged, and is, for example, a secondary battery or an electric double layer capacitor.

Incidentally, paying attention to the fact that the electric power system 10 includes the electric power supply device 20, it can be said that the electric power system 10 includes the electric power storage device 22. That is, the electric power system 10 includes a plurality of power sources of the system power source 12 and the power storage device 22.

Here, the maximum value of the system power P0 that can be supplied by the system power supply 12 is defined as the first maximum power Pm1. The first maximum electric power Pm1 varies depending on the contents of the contract with the electric power company or the electric power usage status of other electric power systems.

Further, the maximum value of the electric power that can be supplied by the power storage device 22 is defined as the second maximum electric power Pm2. The second maximum power Pm2 fluctuates according to the state (for example, SOC and temperature) of the power storage device 22.

The value obtained by combining the first maximum power Pm1 and the second maximum power Pm2 is defined as the supplyable power Pmax. The supplyable power Pmax is the maximum value of the power that can be supplied by the power supply device 20. In other words, the electric power system 10 (in other words, the electric power supply device 20) supplies electric power to the vehicle 11 with the available electric power Pmax as the upper limit.

As shown in FIG. 1, the power supply device 20 of the present embodiment includes, for example, an AC / DC inverter 30, a first DC / DC converter 31 as a first variable unit, and a second variable, in addition to the power storage device 22. It includes a second DC / DC converter 32 as a unit, a switching unit 40 having a first changeover switch 41 and a second changeover switch 42, and a control unit 50.

The AC / DC inverter 30 converts the system power P0 output from the system power supply 12 into DC power. For example, the AC / DC inverter 30 includes a rectifier that rectifies the system power P0 into DC power, and a conversion circuit that has a switching element and inputs the rectified DC power. When the switching element of the conversion circuit switches at a predetermined duty ratio, DC power of a voltage Vt suitable for charging the power storage device 22 or the vehicle power storage device 11a or a voltage corresponding thereto is generated. That is, it can be said that the AC / DC inverter 30 of the present embodiment converts the system power P0 into DC power having a voltage Vt suitable for charging the power storage device 22 or the vehicle power storage device 11a or a voltage corresponding to the voltage Vt.

The first DC / DC converter 31 is provided between the AC / DC inverter 30 and the vehicle 11. Specifically, the first DC / DC converter 31 is electrically connected to the AC / DC inverter 30 via the switching unit 40 (specifically, the first switching switch 41). When the AC / DC inverter 30 and the first DC / DC converter 31 are electrically connected by the switching unit 40, the DC power output from the AC / DC inverter 30 is input to the first DC / DC converter 31. Further, the first DC / DC converter 31 is electrically connected to a plurality of connectors 21, and is electrically connected to the vehicle 11 via the plurality of connectors 21.

The first DC / DC converter 31 has a first switching element 31a. The first DC / DC converter 31 corresponds to the first duty ratio D1 by performing the switching operation with the first duty ratio D1 in the situation where the power is supplied from the AC / DC inverter 30. The generated first supply power Pout1 is output toward the vehicle 11. As a result, the first supply power Pout1 is supplied to the vehicle 11. That is, the first supply power Pout1 is the power supplied to the vehicle 11 using the system power supply 12.

Further, the first supply power Pout1 changes depending on the first duty ratio D1. Therefore, by variably controlling the first duty ratio D1, the first supply power Pout1 can be variably controlled.

The second DC / DC converter 32 is provided between the power storage device 22 and the vehicle 11. Specifically, the second DC / DC converter 32 is electrically connected to the power storage device 22, and the discharge power from the power storage device 22 is input to the second DC / DC converter 32. Further, the second DC / DC converter 32 is electrically connected to the vehicle 11 via the switching unit 40 (specifically, the second switching switch 42) and the connector 21.

The second DC / DC converter 32 has a second switching element 32a. In the second DC / DC converter 32, the second switching element 32a performs a switching operation at the second duty ratio D2 in a situation where the second DC / DC converter 32 and the vehicle 11 are electrically connected by the switching unit 40. , The second supply power Pout2 corresponding to the second duty ratio D2 is output toward the vehicle 11. As a result, the second supply power Pout2 is supplied to the vehicle 11. That is, the second power supply Pout2 is the power supplied to the vehicle 11 by using the power storage device 22.

Further, the second supply power Pout2 changes depending on the second duty ratio D2. Therefore, the second supply power Pout2 can be variably controlled by variably controlling the second duty ratio D2.

The switching unit 40 sets the connection state of the system power supply 12 and the power storage device 22 to the first connection state in which both the system power supply 12 and the power storage device 22 are electrically connected to the vehicle 11, or the system power supply 12 is the power storage device. It switches to the second connection state that is electrically connected to 22.

Specifically, the power supply device 20 of the present embodiment includes a charging line 43 for charging the power storage device 22 using the system power supply 12. The first changeover switch 41 of the present embodiment switches, for example, the output destination of the AC / DC inverter 30 to the first DC / DC converter 31 or the charging line 43. The second changeover switch 42 of the present embodiment switches the connection destination of the second DC / DC converter 32 to the vehicle 11 or the charging line 43.

When the output destination of the AC / DC inverter 30 is the first DC / DC converter 31 by the first changeover switch 41, the system power supply 12 and the vehicle 11 are connected to each other via the AC / DC inverter 30 and the first DC / DC converter 31. It is electrically connected. Then, when the connection destination of the second DC / DC converter 32 is the vehicle 11 by the second changeover switch 42, the power storage device 22 and the vehicle 11 are electrically connected via the second DC / DC converter 32.

That is, the first connection state in the present embodiment means that the output destination of the AC / DC inverter 30 is the first DC / DC converter 31 by the first changeover switch 41 and the second DC / DC converter 32 is connected by the second changeover switch 42. The destination is the vehicle 11.

When the switching unit 40 is in the first connection state and both DC / DC converters 31 and 32 are operating, power is supplied to the vehicle 11 from both the system power supply 12 and the power storage device 22. Specifically, the system power supply 12 supplies the first supply power Pout1 to the vehicle 11, and the power storage device 22 supplies the second supply power Pout2 to the vehicle 11. As a result, the vehicle power storage device 11a is charged. That is, the first connection state can be said to be a power supply state in which power is supplied to the vehicle 11 by both the system power supply 12 and the power storage device 22.

Here, as shown in FIG. 1, the power path from the system power supply 12 to the vehicle 11 via the AC / DC inverter 30 and the first DC / DC converter 31 is referred to as a first power path R1, and a second DC / DC converter 32. The power path from the power storage device 22 to the vehicle 11 via the power storage device 22 is referred to as a second power path R2. It can be said that the electric power system 10 in the present embodiment includes both electric power paths R1 and R2 as routes for supplying electric power to the vehicle 11. The second power path R2 is a power path that connects the power storage device 22 and the vehicle 11 without going through the system power supply 12.

Further, in the present embodiment, a part of both power paths R1 and R2 is shared. Specifically, the portion from the first DC / DC converter 31 to the vehicle 11 in the first power path R1 and the portion from the second DC / DC converter 32 to the vehicle 11 in the second power path R2 are partially shared. There is.

The first DC / DC converter 31 is provided on the first power path R1, and more specifically, is provided on a non-common individual path in the first power path R1. The second DC / DC converter 32 is provided on the second power path R2, and more specifically, is provided on a non-common individual path in the second power path R2.

On the other hand, the output destination of the AC / DC inverter 30 is the charging line 43 by the first changeover switch 41, and the connection destination of the second DC / DC converter 32 is the charging line 43 by the second changeover switch 42. In this case, the system power supply 12 and the power storage device 22 are electrically connected via the AC / DC inverter 30 and the second DC / DC converter 32.

That is, in the second connection state in the present embodiment, the output destination of the AC / DC inverter 30 becomes the charging line 43 by the first changeover switch 41, and the connection destination of the second DC / DC converter 32 is charged by the second changeover switch 42. It is in a state of being line 43.

When the switching unit 40 is in the second connection state, the DC power output from the AC / DC inverter 30 is input to the second DC / DC converter 32 through the charging line 43. In this case, the power storage device 22 is charged by the switching operation of the second switching element 32a. Therefore, the second connection state can be said to be a charging state in which the power storage device 22 is charged using the system power supply 12.

As shown in FIG. 1, the control unit 50 is electrically connected to the vehicle 11 as a load via the connector 21. As a result, when the vehicle 11 is connected to the connector 21, the control unit 50 recognizes that the vehicle 11 as a power supply target exists. In addition, information can be exchanged between the control unit 50 and the vehicle 11. For example, the control unit 50 receives the required power Pr, which is the power required to charge the vehicle power storage device 11a, from the vehicle 11.

Further, the power supply device 20 includes a detection sensor 51 that detects various states such as SOC or temperature of the power storage device 22. The detection sensor 51 transmits the detection result to the control unit 50. As a result, the control unit 50 can grasp the state of the power storage device 22.

The control unit 50 is electrically connected to both DC / DC converters 31 and 32. The control unit 50 controls both DC / DC converters 31 and 32 so that power is supplied to the vehicle 11 from both the system power supply 12 and the power storage device 22.

The control unit 50 has, for example, a circuit including a control CPU 52, a drive CPU 53, and a memory 54 as a storage unit.
The control CPU 52 controls the switching unit 40. Further, the control CPU 52 executes various processes using various programs stored in the memory 54. For example, when the control CPU 52 supplies electric power to the vehicle 11, the target power supply Pt, which is a target value of the electric power to be supplied to the vehicle 11, is based on the required electric power Pr required from the vehicle 11 and the supplyable electric power Pmax. The process of determining both set powers Pt1 and Pt2 is executed. The process will be described later.

The drive CPU 53 is electrically connected to the control CPU 52, and drives and controls both DC / DC converters 31 and 32 (specifically, both switching elements 31a and 32a) based on a command from the control CPU 52. ..

For example, the drive CPU 53 derives duty ratios D1 and D2 corresponding to the set powers Pt1 and Pt2 based on receiving both set powers Pt1 and Pt2 as a kind of command from the control CPU 52, and the duty ratios D1 and D2. Both switching elements 31a and 32a are switched. As a result, the supply powers Pout1 and Pout2 corresponding to the set powers Pt1 and Pt2 are output from the DC / DC converters 31 and 32, and the combined power of both supply powers Pout1 and Pout2 is supplied to the vehicle 11.

Incidentally, in the AC / DC inverter 30 and both DC / DC converters 31 and 32, a loss due to conversion such as a switching loss occurs. In other words, the conversion efficiency of the AC / DC inverter 30 and both DC / DC converters 31 and 32 is not 100%. Therefore, the supply powers Pout1 and Pout2 actually supplied to the vehicle 11 are smaller than the set powers Pt1 and Pt2.

The specific mode for deriving the duty ratios D1 and D2 from the set powers Pt1 and Pt2 is arbitrary. For example, the memory 54 is provided with a drive table in which the set powers Pt1 and Pt2 and the duty ratios D1 and D2 are set in association with each other, and the drive CPU 53 receives this time by referring to the drive table. The duty ratios D1 and D2 corresponding to the set powers Pt1 and Pt2 may be derived.

The control CPU 52 controls the switching unit 40 (specifically, both changeover switches 41 and 42) according to a situation such as when charging the power storage device 22 or when supplying electric power to the vehicle 11, and also commands the drive CPU 53. To send.

First, the charging of the power storage device 22 will be described. Based on the fact that the charging start condition of the power storage device 22 is satisfied, the control CPU 52 switches the connection state of the system power supply 12 and the power storage device 22 to the second connection state. The unit 40 is controlled.

The charging start condition of the power storage device 22 includes, for example, a case where the vehicle 11 is not connected to the connector 21 (in other words, a case where there is no power supply target). However, the charging start condition of the power storage device 22 is arbitrary, and may be, for example, a case where the SOC of the power storage device 22 is equal to or less than a predetermined threshold value, or a case where a predetermined charging start time is reached.

Further, the control CPU 52 grasps the current state of the power storage device 22 based on the detection result of the detection sensor 51, and derives the target charging power Pct corresponding to the charging of the power storage device 22 based on the state of the power storage device 22. To do.

Then, the control CPU 52 derives the set charging power Pcs based on the charging efficiency η0 so that the target charging power Pct is supplied to the power storage device 22. The charging efficiency η0 is the efficiency when the power storage device 22 is charged using the system power P0, and is, for example, the ratio of the power actually supplied to the power storage device 22 to the system power P0. The charging efficiency η0 is smaller than 100% due to the conversion loss in the AC / DC inverter 30 and the conversion loss in the second DC / DC converter 32 (specifically, the switching loss in the second switching element 32a).

The set charging power Pcs is a value in which the charging efficiency η0 is added so that the target charging power Pct is supplied to the power storage device 22, and is, for example, a value obtained by dividing the target charging power Pct by the charging efficiency η0 (Pcs =). Pct / η0). Therefore, the set charging power Pcs is set higher than the target charging power Pct. Then, the control CPU 52 transmits the set charging power Pcs to the drive CPU 53 as a command.

When the drive CPU 53 receives the set charge power Pcs from the control CPU 52, the drive CPU 53 derives the second duty ratio D2 corresponding to the set charge power Pcs, and switches the second switching element 32a at the second duty ratio D2. .. As a result, the target charging power Pct is output from the second DC / DC converter 32 toward the power storage device 22, and the target charging power Pct is supplied to the power storage device 22.

Next, the power supply to the vehicle 11 will be described.
The control CPU 52 reads the power supply control process execution program 54a stored in the memory 54 based on the satisfaction of the power supply start condition, and executes the power supply control process for controlling the power supply to the vehicle 11. ..

The power supply start condition includes, for example, that the vehicle 11 is connected to the connector 21. However, the power supply start condition is not limited to this, and is arbitrary. For example, the SOC of the vehicle power storage device 11a is equal to or less than a predetermined threshold value, or the vehicle 11 or the power supply device 20 is charged. It may be that the above has been performed or that the supply start time has been set in advance. The charging start operation is optional, but for example, when the vehicle 11 or the power supply device 20 is provided with the charging start switch, the charging start switch may be operated.

The power supply control process will be described with reference to FIG.
As shown in FIG. 2, the control CPU 52 controls the switching unit 40 in step S101 to change the connection state of the system power supply 12 and the power storage device 22 to the first connection state. As a result, the AC / DC inverter 30 and the first DC / DC converter 31 are connected to form the first power path R1, and the second DC / DC converter 32 and the vehicle 11 are connected to form the second power path R2. Is formed.

After that, the control CPU 52 grasps the required power Pr in step S102. In detail, as already described, information can be exchanged between the vehicle 11 and the control unit 50. Then, the vehicle 11 grasps the electric power required for charging the electric power storage device 11a for the vehicle this time, and transmits the electric power as the required electric power Pr to the control unit 50. As a result, the control CPU 52 grasps the required power Pr.

When a plurality of vehicles 11 are connected at the same time, the control CPU 52 grasps the required power Pr from each vehicle 11 and grasps the total required power Pr.
Incidentally, the voltage Vt suitable for charging may differ depending on the type of the vehicle power storage device 11a. In this case, the power supply device 20 has a voltage sensor that detects the voltage of the vehicle power storage device 11a, and the control CPU 52 grasps the voltage Vt suitable for charging based on the detection result of the voltage sensor. Further, the AC / DC inverter 30 adjusts the voltage of the output DC power in correspondence with the voltage Vt suitable for the charging.

However, the configuration for the power supply device 20 (control CPU 52) to grasp the voltage Vt suitable for charging is not limited to the voltage sensor, and is arbitrary. For example, the vehicle 11 directs the control unit 50 to a voltage suitable for charging. It may be configured to notify Vt.

In the following step S103, the control CPU 52 grasps the supplyable power Pmax. The control CPU 52 grasps the first maximum power Pm1 through communication with, for example, an external management device that manages the system power supply 12.

Specifically, the external management device manages the system power P0 that can be supplied to the power system 10 (in other words, the power supply device 20). For example, when a system other than the power system 10 (in other words, the power supply device 20) of the present embodiment uses the system power supply 12, the external management device does not exceed the permissible value specified by the contract or the standard. In addition, the electric power that can be supplied to the electric power system 10 of the present embodiment, that is, the first maximum electric power Pm1 is managed. Therefore, the control CPU 52 grasps the first maximum power Pm1 through communication with the external management device.

Further, the control CPU 52 grasps the second maximum power Pm2 based on the detection result of the detection sensor 51 and the like. Then, the control CPU 52 grasps the power Pmax that can be supplied from both the maximum powers Pm1 and Pm2.

Here, the first maximum power Pm1 of the present embodiment can fluctuate according to the usage status of other power systems. Further, the second maximum power Pm2 may fluctuate according to the state of the power storage device 22. Therefore, the supplyable power Pmax is a parameter that fluctuates depending on the situation.

However, a specific mode for grasping both maximum powers Pm1 and Pm2 is arbitrary. For example, when a predetermined supplyable power Pmax is stored in the memory 54, the control CPU 52 may be configured to grasp the supplyable power Pmax stored in the memory 54. In this case, the supplyable electric power Pmax may be determined based on both maximum electric powers Pm1 and Pm2 predetermined by a contract with an electric power company or a standard or the like.

After that, in step S104, the control CPU 52 determines whether or not the required power Pr is equal to or higher than the supplyable power Pmax.
When the required power Pr is equal to or higher than the supplyable power Pmax, the control CPU 52 proceeds to step S105 and sets the supplyable power Pmax as the target supply power Pt. Then, in step S106, the control CPU 52 sets both set powers Pt1 and Pt2 in correspondence with the target power supply Pt. Specifically, the control CPU 52 sets the first maximum power Pm1 as the first set power Pt1 and the second maximum power Pm2 as the second set power Pt2. After setting both set powers Pt1 and Pt2, the control CPU 52 proceeds to step S109.

On the other hand, when the required power Pr is smaller than the supplyable power Pmax, the control CPU 52 negatively determines step S104, proceeds to step S107, and sets the target power supply Pt to the required power Pr.

After that, in step S108, the control CPU 52 executes the set power derivation process for deriving both set powers Pt1 and Pt2 based on the derivation parameter PD including the target supply power Pt.

In the present embodiment, the derivation parameter PD supplies power to the vehicle 11 using the first efficiency η1 which is the efficiency when power is supplied to the vehicle 11 using the system power supply 12, and the power storage device 22 as a specific power source. The second efficiency η2, which is the efficiency when the operation is performed, is included.

The first efficiency η1 is, for example, the ratio of the power actually supplied to the vehicle 11 to the system power P0 supplied from the system power supply 12 to the power supply device 20, and more specifically, the first supply power to the system power P0. It is the ratio of Pout1. The first efficiency η1 includes the conversion efficiency of the AC / DC inverter 30 and the conversion efficiency of the first DC / DC converter 31. In other words, the first efficiency η1 can be said to be the transmission efficiency of the power for transmitting the first power path R1.

The second efficiency η2 in the present embodiment includes a charging efficiency η0 and a transmission efficiency of electric power for transmitting the second power path R2. The transmission efficiency of the electric power transmitted through the second electric power path R2 is the ratio of the electric power actually supplied to the vehicle 11 to the output electric power from the power storage device 22, and includes the conversion efficiency of the second DC / DC converter 32. ..

Here, as shown in FIG. 3, both efficiencies η1 and η2 have current dependence. That is, the efficiencies η1 and η2 are parameters that fluctuate according to the currents flowing through both power paths R1 and R2.

Incidentally, considering that the electric power is a multiplication of the voltage and the current, it can be said that the efficiencies η1 and η2 are parameters that fluctuate according to the supplied electric powers Pout1 and Pout2. Further, considering that the voltages of both supply powers Pout1 and Pout2 are the same in the present embodiment in which the system power supply 12 and the power storage device 22 cooperate to charge the same vehicle power storage device 11a, the first efficiency η1 Is a function of Pout1 / Vt, and the second efficiency η2 can be said to be a function of Pout2 / Vt.

Further, paying attention to the fact that the supply powers Pout1 and Pout2 correspond to the set powers Pt1 and Pt2, the first efficiency η1 can be said to be a function of Pt1 / Vt, and the second efficiency η2 can be said to be a function of Pt2 / Vt.

In the present embodiment, as described above, the second efficiency η2 includes the charging efficiency η0, which is the efficiency when the power storage device 22 is charged using the system power P0. Therefore, the second efficiency η2 is lower than the first efficiency η1.

As shown in FIG. 1, the memory 54 stores efficiency data 54b for specifying the correlation between the current and the efficiencies η1 and η2. The specific data structure of the efficiency data 54b is arbitrary, and may be, for example, function data showing the graph of FIG. 3, or table data in which a plurality of currents and efficiencies η1 and η2 are associated with each current. It may be.

Incidentally, both efficiencies η1 and η2 have voltage dependence. Therefore, considering that a plurality of types of loads having different required voltages are connected, it is preferable that the efficiency data 54b is stored in a plurality of types corresponding to each voltage.

As described above, the control CPU 52 knows the voltage Vt suitable for charging. Therefore, in step S108, the control CPU 52 may refer to the efficiency data 54b corresponding to the voltage Vt suitable for charging, which is grasped this time.

In the present embodiment, the target power supply Pt, both efficiencies η1 and η2, and both maximum powers Pm1 and Pm2 are adopted as the derivation parameter PD. Specifically, the control CPU 52 derives parameters so that the target power supply Pt is supplied to the vehicle 11 and the total value of both set powers Pt1 and Pt2 becomes the minimum value within the range not exceeding both maximum powers Pm1 and Pm2. Both set powers Pt1 and Pt2 are derived based on the PD.

As an example, the control CPU 52 derives both set powers Pt1 and Pt2 in which the total value of both set powers Pt1 and Pt2 is the minimum value within the range satisfying the following conditions 1 to 3.
Condition 1: Pt1 × η1 (Pt1 / Vt) + Pt2 × η2 (Pt2 / Vt) = Pt
Condition 2: Pt1 ≤ Pm1
Condition 3: Pt2 ≤ Pm2
The specific method for deriving both set powers Pt1 and Pt2 is arbitrary, but it is conceivable to use, for example, a mathematical programming method. The specific method of mathematical programming is arbitrary, such as linear or non-linear.

As shown in FIG. 2, after executing the process of step S106 or step S108, the control CPU 52 executes the set power transmission process of transmitting the set powers Pt1 and Pt2 to the drive CPU 53 as commands in step S109. Based on receiving the above command, the drive CPU 53 switches the switching elements 31a and 32a at the duty ratios D1 and D2 corresponding to the set powers Pt1 and Pt2. As a result, the DC / DC converters 31 and 32 output the supply powers Pout1 and Pout2 corresponding to the set powers Pt1 and Pt2. Then, the combined electric power of both supplied electric powers Pout1 and Pout2 is supplied to the vehicle 11.

As described above, the supply powers Pout1 and Pout2 are smaller than the set powers Pt1 and Pt2 by the amount corresponding to the efficiencies η1 and η2. However, the combined power of both supply powers Pout1 and Pout2 is the same as the target power supply Pt. That is, the system power supply 12 and the power storage device 22 cooperate to supply the target power supply Pt to the vehicle 11. Further, it can be said that the control CPU 52 derives both set powers Pt1 and Pt2 in consideration of both efficiencies η1 and η2 so that the target power supply Pt is supplied to the vehicle 11.

After that, in step S110, the control CPU 52 determines whether or not the end condition for terminating the power supply to the vehicle 11 is satisfied. The termination condition is arbitrary, but includes, for example, the vehicle power storage device 11a being fully charged, or the vehicle 11 or the power supply device 20 being charged.

When the end condition is satisfied, the control CPU 52 proceeds to step S111, executes a stop process, and ends the power supply control process. Explaining the stop processing in detail, the control CPU 52 transmits a stop command to, for example, the drive CPU 53. The drive CPU 53 stops the operations of both DC / DC converters 31 and 32 (specifically, the switching operations of both switching elements 31a and 32a) based on receiving the stop command. As a result, the power supply is stopped.

The control CPU 52 may switch the connection state of the system power supply 12 and the power storage device 22 from the first connection state to the second connection state in step S111. When the switching unit 40 can switch to a neutral state in which the output destination of the AC / DC inverter 30 and the connection destination of the second DC / DC converter 32 are not connected to either, the control CPU 52 switches the switching unit 40. You may switch to the neutral state.

On the other hand, if the end condition is not satisfied, the control CPU 52 negatively determines step S110 and proceeds to step S112 to determine whether or not the change condition for changing the power supply mode is satisfied.

The change condition of the present embodiment includes a ratio change condition for changing the ratio of both supply powers Pout1 and Pout2. The ratio change condition includes, for example, a change in the state of the system power supply 12 or a change in the state of the power storage device 22.

Here, as described above, the status of the system power supply 12 fluctuates according to the usage status of other power systems and the like, and the first maximum power Pm1 may fluctuate accordingly. Further, the state of the power storage device 22 (for example, SOC, temperature, etc.) fluctuates, and the second maximum power Pm2 may fluctuate accordingly. Therefore, the ratio change condition includes the fluctuation of the first maximum power Pm1 or the second maximum power Pm2.

The fluctuation of the first maximum power Pm1 includes "0". That is, the ratio change condition includes, for example, a case where the system power supply 12 cannot be used due to a power failure or a case where the power storage device 22 abnormally stops. In other words, it can be said that the ratio of both supplied powers Pout1 and Pout2 includes "1: 0" or "0: 1".

Further, the change condition includes a change of the required power Pr. The required power Pr may vary depending on the state of the vehicle power storage device 11a. Further, when another vehicle 11 is connected to another connector 21 while supplying power to a certain vehicle 11, the total required power Pr is increased by the required power Pr transmitted from the other vehicle 11. Become.

If the change condition is not satisfied, the control CPU 52 returns to step S110 as it is, while if the change condition is satisfied, the control CPU 52 executes the change correspondence process of step S113 and returns to step S110.

The change handling process will be described in detail. In the change response process, the control CPU 52 again derives both set powers Pt1 and Pt2 based on the changed conditions. Specifically, the control CPU 52 executes the processes of steps S104 to S109 again based on the changed conditions to derive the set powers Pt1 and Pt2 and transmit the command. As a result, the supply powers Pout1 and Pout2 corresponding to the changed conditions are output from the DC / DC converters 31 and 32, and the target supply power Pt in which both supply powers Pout1 and Pout2 are combined is supplied to the vehicle 11.

For example, if at least one of the two maximum powers Pm1 and Pm2 fluctuates, the ratio of the two maximum powers Pout1 and Pout2 may fluctuate even if the target power supply Pt does not fluctuate. In this case, it can be said that the control CPU 52 executes the process of changing the ratio of both supply powers Pout1 and Pout2 without changing the target power supply Pt in step S113.

As an example, when the power supply to the vehicle 11 is started, the supplyable power Pmax that does not consider both efficiencies η1 and η2 is given to the vehicle 11 because the required power Pr is equal to or higher than the supplyable power Pmax. Suppose it was supplied. After that, if the first maximum power Pm1 becomes large due to fluctuations in the usage status of other power systems, power can be supplied in consideration of both efficiencies η1 and η2. In this case, the control CPU 52 may change the ratio of both supply powers Pout1 and Pout2 so that the first supply power Pout1 is relatively larger than the second supply power Pout2.

Further, it is assumed that the second maximum power Pm2 becomes smaller based on the decrease in the SOC of the power storage device 22 in the situation where the power is supplied in consideration of both efficiencies η1 and η2. In this case, in step S113, the control CPU 52 may change the ratio of both supplied powers Pout1 and Pout2 so that the amount of power supplied from the system power supply 12 is relatively large while maintaining the target power supply Pt. ..

On the other hand, when the first maximum power Pm1 becomes smaller due to, for example, the usage status of another power system, the control CPU 52 relatively maintains the target power supply Pt and the second power supply Pout2 in step S113. The ratio of both supplied powers Pout1 and Pout2 may be changed so that

In the present embodiment, the control CPU 52 that executes the set power derivation process corresponds to the “deriving unit”, and the control CPU 52 and the drive CPU 53 that execute the process of step S109 are the “first power control unit” and the “second power control unit”. Corresponds to. The control CPU 52 that executes the process of step S106 corresponds to the “maximum setting unit”. Further, the control CPU 52 that executes the process of step S113 corresponds to the “ratio changing unit”.

Next, the operation of this embodiment will be described.
The electric power system 10 of the present embodiment is configured so that electric power is supplied to the vehicle 11 from both the system power supply 12 and the power storage device 22. Specifically, the power system 10 includes a first power path R1 from the system power supply 12 to the vehicle 11, and a second power path R2 from the power storage device 22 to the vehicle 11 without going through the system power supply 12. .. Therefore, the system power P0 required to supply the same target power supply Pt to the vehicle 11 becomes smaller.

According to the present embodiment described in detail above, the following effects are obtained.
(1) The power system 10 includes a system power supply 12, a power storage device 22 as a specific power supply provided separately from the system power supply 12, and a vehicle 11 as a load to which power is supplied by the system power supply 12 and the power storage device 22. , Is equipped. The power system 10 uses a first DC / DC converter 31 as a first variable unit for varying the first supply power Pout1, which is the power supplied to the vehicle 11 using the system power supply 12, and the vehicle 11 using the power storage device 22. A second DC / DC converter 32 as a second variable unit for varying the second supply power Pout2, which is the electric power supplied to the device, and a control unit 50 are provided. The control unit 50 controls both DC / DC converters 31 and 32 so that power is supplied to the vehicle 11 from both the system power supply 12 and the power storage device 22.

According to this configuration, since power is supplied to the vehicle 11 from both the system power supply 12 and the power storage device 22, the power of the power storage device 22 is once converted to the system power P0 and used as the first supply power Pout1. Compared with the configuration supplied to 11, the loss of once converting the electric power of the power storage device 22 into the system electric power P0 can be reduced. Further, since the first supply power Pout1 required to supply the target supply power Pt to the vehicle 11 can be reduced by the amount of the second supply power Pout2, the system power P0 can be made smaller than the target supply power Pt. it can. As a result, power can be supplied to the vehicle 11 without requiring an excessively large system power P0. Therefore, even under the condition that the upper limit of the system power P0 is set, the power can be suitably supplied to the vehicle 11.

(2) In step S108, the control unit 50 derives both set powers Pt1 and Pt2 based on the target supply power Pt, which is the target value of the power supplied to the vehicle 11, and the derivation parameter PD including both efficiencies η1 and η2. It includes a control CPU 52 that executes a set power derivation process. The first efficiency η1 is the efficiency when power is supplied to the vehicle 11 using the system power supply 12, and the second efficiency η2 is the efficiency when power is supplied to the vehicle 11 using the power storage device 22. Further, the control CPU 52 and the drive CPU 53 of the control unit 50 control the DC / DC converters 31 and 32 so that the supply powers Pout1 and out2 corresponding to the set powers Pt1 and Pt2 are supplied to the vehicle 11.

According to this configuration, in a configuration in which power is supplied to the vehicle 11 from both the system power supply 12 and the power storage device 22, both set powers Pt1 and Pt2 are derived by the derivation parameter PD including both efficiencies η1 and η2. To. As a result, efficient power supply can be performed in consideration of both efficiencies η1 and η2, so that the power supply accompanies the power supply as compared with the case where the power supply is performed only by the system power P0 or the power supply is performed only by the power storage device 22. Loss can be reduced.

(3) The first efficiency η1 is a parameter that fluctuates according to the first supply power Pout1, and the second efficiency η2 is a parameter that fluctuates according to the second supply power Pout2. Therefore, if power is supplied only by the system power supply 12, the first power supply Pout1 may be supplied with the first efficiency η1 being excessively low depending on the target power supply Pt. Similarly, when power is supplied only by the power storage device 22, the second power supply Pout2 may be supplied with the second efficiency η2 being excessively low depending on the target power supply Pt.

In this respect, in the present embodiment, since both supply powers Pout1 and Pout2 are controlled based on both efficiencies η1 and η2, the target supply power Pt can be supplied while both efficiencies η1 and η2 are relatively high. As a result, the effects of (1), (2) and the like are produced.

(4) The power storage device 22 is charged by the system power supply 12. The second efficiency η2 includes the charging efficiency η0 of the power storage device 22.
According to such a configuration, both set powers Pt1 and Pt2 can be derived in consideration of the charging efficiency η0 of the power storage device 22, and more efficient power supply can be performed as a whole. Since the second efficiency η2 includes the charging efficiency η0, the second efficiency η2 is lower than the first efficiency η1.

(5) The control CPU 52 derives both set powers Pt1 and Pt2 based on the derivation parameter PD so that the target supply power Pt is supplied to the vehicle 11 and the total value of both set powers Pt1 and Pt2 becomes the minimum value. ..

According to this configuration, in a configuration in which the target power supply Pt is supplied to the vehicle 11 by using the system power supply 12 and the power storage device 22, the loss is obtained by deriving the combination of both set powers Pt1 and Pt2 having the smallest loss. Can be further reduced.

(6) The power system 10 (in other words, the power supply device 20) includes an AC / DC inverter 30 that converts the system power P0 output from the system power supply 12 into DC power. The first DC / DC converter 31 is provided between the AC / DC inverter 30 and the vehicle 11, and the second DC / DC converter 32 is provided between the power storage device 22 and the vehicle 11.

In such a configuration, the power system 10 includes a switching unit 40 that switches the connection state of the system power supply 12 and the power storage device 22 to the first connection state or the second connection state. In the first connection state, the system power supply 12 is connected to the vehicle 11 via the AC / DC inverter 30 and the first DC / DC converter 31, and the power storage device 22 is connected to the vehicle 11 via the second DC / DC converter 32. It is in a state of being. The second connection state is a state in which the system power supply 12 is connected to the power storage device 22 via the AC / DC inverter 30 and the second DC / DC converter 32.

According to such a configuration, by controlling the switching unit 40 according to the situation, the same AC / DC inverter 30 is used to supply electric power to the vehicle 11 and charge the power storage device 22. Can be done.

(7) The power supply device 20 (in other words, the power system 10) includes a charging line 43 used to charge the power storage device 22 using the system power supply 12. The switching unit 40 connects the first changeover switch 41 that switches the output destination of the AC / DC inverter 30 to the first DC / DC converter 31 or the charging line 43 and the connection destination of the second DC / DC converter 32 to the vehicle 11 or the charging line 43. A second changeover switch 42 for switching is provided.

According to such a configuration, by controlling both the changeover switches 41 and 42, it is possible to switch between charging the power storage device 22 and supplying electric power to the vehicle 11 using the system power supply 12 and the power storage device 22. As a result, the effect of (6) is achieved.

(8) The maximum power that can be supplied by the system power supply 12 is set to the first maximum power Pm1, the maximum power that can be supplied by the power storage device 22 is set to the second maximum power Pm2, and the combined power of both maximum powers Pm1 and Pm2 can be supplied. Let the power be Pmax.

When the required power Pr required from the vehicle 11 is equal to or higher than the supplyable power Pmax, the control CPU 52 executes the process of step S106 for setting the set powers Pt1 and Pt2 to the maximum powers Pm1 and Pm2. Then, when the required power Pr is smaller than the supplyable power Pmax, the control CPU 52 determines the maximum power Pm1, based on the derived parameter PD including the target power supply Pt, both efficiencies η1, η2, and both maximum powers Pm1 and Pm2. The set powers Pt1 and Pt2 within the range not exceeding Pm2 are derived.

According to this configuration, when the required power Pr is equal to or higher than the supplyable power Pmax, the set powers Pt1 and Pt2 are set to the maximum powers Pm1 and Pm2. Thereby, the electric power corresponding to the supplyable electric power Pmax can be supplied to the vehicle 11. Therefore, when the required power Pr is equal to or higher than the supplyable power Pmax, it is possible to supply power as close to the required power Pr as possible while suppressing an excessive load on the system power supply 12 and the power storage device 22.

On the other hand, when the required power Pr is smaller than the supplyable power Pmax, the first set power Pt1 within the range not exceeding the first maximum power Pm1 and the second maximum power Pm2 are exceeded based on the derived parameter PD. The second set power Pt2 within a range that does not exist is derived. As a result, efficient power supply can be performed within a range in which the supplied powers Pout1 and Pout2 do not exceed the maximum powers Pm1 and Pm2.

(9) The control CPU 52 executes the change response process in step S113 when the ratio change condition is satisfied in a situation where power is being supplied to the vehicle 11 from both the system power supply 12 and the power storage device 22. The change response process includes a process of changing the ratio (in other words, the distribution rate) of both supplied powers Pout1 and Pout2.

According to such a configuration, it is possible to cope with the state change of the system power supply 12 and the state change of the power storage device 22 during the power supply to the vehicle 11. As for the status fluctuation of the grid power supply 12, for example, it is conceivable that the first maximum power Pm1 fluctuates according to the usage status of another power system. Further, it is conceivable that the state fluctuation of the power storage device 22 means that the second maximum power Pm2 fluctuates due to fluctuations in the SOC and temperature of the power storage device 22.

In particular, in the present embodiment, since the ratio of both supply powers Pout1 and Pout2 can be changed without changing the target supply power Pt, the situation change and storage of the system power supply 12 while maintaining the target supply power Pt. It can respond to changes in the state of the device 22.

(10) The power supply device 20 supplies power to the vehicle 11 by using the system power supply 12 and the power storage device 22 provided separately from the system power supply 12. The power supply device 20 includes a first DC / DC converter 31 as a first variable unit, a second DC / DC converter 32 as a second variable unit, and a control unit 50 that controls both DC / DC converters 31 and 32. It has.

In such a configuration, the control unit 50 executes the control CPU 52 that executes the set power derivation process in step S108 for deriving both set powers Pt1 and Pt2 based on the target supply power Pt and the derivation parameter PD including both efficiencies η1 and η2. I have. Further, the control CPU 52 and the drive CPU 53 of the control unit 50 control the DC / DC converters 31 and 32 so that the supply powers Pout1 and Pout2 corresponding to the set powers Pt1 and Pt2 are supplied to the vehicle 11. As a result, the effect of (2) is achieved.

The above embodiment may be changed as follows.
○ The second efficiency η2 may be configured not to include the charging efficiency η0.
○ The electric power system 10 (in other words, the electric power supply device 20) of the present embodiment may be for home use. That is, the application destination of the power system 10 is arbitrary.

○ The load is not limited to the vehicle 11, and may be any, for example, an industrial motor.
○ The power supply device 20 does not have to include the power storage device 22. In this case, the power supply device 20 may have an input unit so that the power supply from the power storage device 22 can be received.

○ The specific power source is not limited to the power storage device 22, and may be any, for example, a solar power generation device having a solar panel or a generator. When a generator is used as a specific power source, the power supply device 20 may have an inverter.

○ The number of specific power supplies is arbitrary, and may be two or more. That is, the specific power supply includes both one case and a plurality of cases. In this case, the electric power system 10 may be configured to supply electric power to the vehicle 11 by using a part of the specific power sources and the system power source 12 among the plurality of specific power sources, or the plurality of specific power sources and the system power source 12 May be used to supply electric power to the vehicle 11. In this case, it is advisable to derive the set power in consideration of the efficiency when each specific power source to be used is used. That is, when the power system 10 has a plurality of specific power supplies, it may be configured to supply power to the load by using at least a part of the plurality of specific power supplies and the system power supply 12.

○ The specific derivation mode of both set powers Pt1 and Pt2 is not limited to that of the embodiment.
For example, the control CPU 52 has a first set power Pt1 in which the first efficiency η1 is equal to or higher than the first threshold efficiency and the second efficiency η2 is equal to or higher than the second threshold efficiency within the range in which the target supply power Pt is supplied to the vehicle 11. It may be configured to derive the combination with the second set power Pt2 that becomes.

Further, the control CPU 52 derives, for example, the power closest to the target supply power Pt as the first set power Pt1 within the range in which the first efficiency η1 is equal to or higher than the first threshold efficiency and the second efficiency η2 is equal to or higher than the second threshold efficiency. Then, the value obtained by subtracting the first set power Pt1 from the target supply power Pt may be derived as the second set power Pt2.

On the contrary, the control CPU 52 secondly sets the power closest to the target supply power Pt within the range in which, for example, the first efficiency η1 is equal to or higher than the first threshold efficiency and the second efficiency η2 is equal to or higher than the second threshold efficiency. It may be derived as the power Pt2, and the value obtained by subtracting the second set power Pt2 from the target supply power Pt may be derived as the first set power Pt1.

In other words, the control CPU 52 derives both set powers Pt1 and Pt2 so that the power supply is more efficient than the case where the power is supplied only by the system power P0 or the power is supplied only by the power storage device 22. For example, it can be said that the specific derivation mode is arbitrary.

○ The power supply device 20 may have a configuration in which an AC / DC inverter for supplying power to the vehicle 11 and an AC / DC inverter for charging the power storage device 22 are separately provided.
○ The power system 10 may be provided separately from the power supply device 20 and may include a charging device for charging the power storage device 22. That is, it is not essential that the power supply device 20 has a configuration for charging the power storage device 22, and the switching unit 40 and the charging line 43 may be omitted.

○ The processing of step S112 and step S113 may be omitted. In short, it is not essential to change the ratio of both supplied powers Pout1 and Pout2 during power supply.
○ The control unit 50 may have a configuration having a dedicated hardware circuit that executes a part or all of the power supply control process.

○ The specific configuration of both variable parts is arbitrary.
○ If the power path can be switched, the specific configuration of the switching unit 40 is arbitrary. For example, the positions of the two changeover switches 41 and 42 may be changed from the positions of the embodiments. The number of changeover switches is arbitrary.

Next, a suitable example that can be grasped from the above embodiment and another example will be described below.
(B) A specific power supply provided separately from the system power supply and the system power supply, a load for which power is supplied using the system power supply and the specific power supply, and power supplied to the load using the system power supply. A first variable unit that changes the first supply power, a second variable unit that changes the second supply power that is the power supplied to the load by using the specific power supply, the first variable unit, and the above. The control unit includes a control unit that controls the second variable unit so that power is supplied to the load from both the system power supply and the specific power supply, and the control unit is the system power supply. When a predetermined ratio change condition is satisfied in a situation where power is supplied to the load from both of the specific power sources, the ratio of the first supply power to the second supply power is changed. An electric power system characterized by having a ratio changing unit for changing.

(B) A power supply device that supplies power to a load by using a system power supply and a specific power supply provided separately from the system power supply, and is supplied to the load by using the system power supply. A first variable unit that changes the first supply power, which is electric power, a second variable unit that changes the second supply power, which is the electric power supplied to the load by using the specific power supply, the first variable unit, and the first variable unit. The control unit includes a control unit that controls the second variable unit so that power is supplied to the load from both the system power supply and the specific power supply, and the control unit is the system power supply. When a predetermined ratio change condition is satisfied in a situation where power is supplied to the load from both the specified power source and the specified power source, the ratio of the first supply power to the second supply power. A power supply device characterized by having a ratio changing unit for changing the ratio.

10 ... Electric power system, 11 ... Vehicle (load), 11a ... Vehicle power storage device, 12 ... System power supply, 20 ... Power supply device, 22 ... Power storage device (specific power supply), 30 ... AC / DC inverter, 31 ... 1st DC / DC converter (1st variable unit), 32 ... 2nd DC / DC converter (2nd variable unit), 40 ... switching unit, 41 ... 1st changeover switch, 42 ... 2nd changeover switch, 43 ... charging line, 50 ... Control unit, 52 ... Control CPU, 53 ... Drive CPU, 54 ... Memory, 54a ... Power supply control processing execution program, 54b ... Efficiency data, R1 ... First power supply, R2 ... Second power path, P0 ... System power, Pout1 ... 1st supply power, Pt1 ... 1st set power, Pm1 ... 1st maximum power, Pout2 ... 2nd supply power, Pt2 ... 2nd set power, Pm2 ... 2nd maximum power, Pr ... Required power, Pt ... Target Supply power, Pmax ... Supplyable power, PD ... Derived parameter, η0 ... Charging efficiency, η1 ... First efficiency, η2 ... Second efficiency.

Claims (7)

A grid power supply and a specific power supply provided separately from the grid power supply,
A load to which power is supplied using the system power supply and the specific power supply, and
A first variable unit that changes the first supply power, which is the power supplied to the load using the system power supply,
A second variable unit that changes the second supply power, which is the power supplied to the load using the specific power supply, and
A control unit that controls the first variable unit and the second variable unit so that power is supplied to the load from both the system power supply and the specific power supply.
With
The control unit
The target power supply to be supplied to the load, the first efficiency which is the efficiency when power is supplied to the load by using the system power supply, and the efficiency when power is supplied to the load by using the specific power supply. A derivation unit that derives the first set power and the second set power based on a derivation parameter including a second efficiency.
A first power control unit that controls the first variable unit so that the first supply power corresponding to the first set power is supplied to the load.
A second power control unit that controls the second variable unit so that the second supply power corresponding to the second set power is supplied to the load.
A power system characterized by being equipped with. The specific power source is a power storage device charged by the system power source.
The power system according to claim 1, wherein the second efficiency includes the charging efficiency of the power storage device. The first efficiency varies depending on the first power supply,
The second efficiency is lower than the first efficiency and fluctuates according to the second power supply.
The derivation unit is based on the derivation parameter so that the power supplied to the load becomes the target power supply and the total value of the first set power and the second set power becomes the minimum value. The power system according to claim 2, wherein the set power and the second set power are derived. It is equipped with an AC / DC inverter that converts the system power output from the system power supply into DC power.
The first variable unit has a first DC / DC converter provided between the AC / DC inverter and the load.
The second variable unit has a second DC / DC converter provided between the power storage device and the load.
In the power system, the connection state of the system power supply and the power storage device is connected to the load via the AC / DC inverter and the first DC / DC converter, and the power storage device is the first. The first connection state connected to the load via the 2DC / DC converter, or the second connection state in which the system power supply is connected to the power storage device via the AC / DC inverter and the second DC / DC converter. The power system according to claim 2 or 3, further comprising a switching unit for switching to a connected state. Assuming that the sum of the first maximum power, which is the maximum power that can be supplied by the system power supply, and the second maximum power, which is the maximum power that can be supplied by the specific power supply, is the power that can be supplied
When the required power required from the load is equal to or greater than the supplyable power, the control unit sets the first set power and the second set power to the first maximum power and the second maximum power. Equipped with a maximum setting unit
The derived parameters include the first maximum power and the second maximum power.
When the required power is smaller than the supplyable power, the derivation unit has the first set power and the second maximum power within a range not exceeding the first maximum power based on the derivation parameter. The power system according to any one of claims 1 to 4, which derives the second set power within a range not exceeding the above. In a situation where the system power supply and the specific power supply cooperate to supply power to the load, the control unit is a ratio change condition including a state change of the system power source or a state change of the specific power source. The power system according to any one of claims 1 to 5, further comprising a ratio changing unit for changing the ratio between the first supplied power and the second supplied power when is satisfied. A power supply device that supplies power to a load using a grid power supply and a specific power supply provided separately from the grid power supply.
A first variable unit that changes the first supply power, which is the power supplied to the load using the system power supply,
A second variable unit that changes the second supply power, which is the power supplied to the load using the specific power supply, and
A control unit that controls the first variable unit and the second variable unit so that power is supplied to the load from both the system power supply and the specific power supply.
With
The control unit
The target power supply to be supplied to the load, the first efficiency which is the efficiency when power is supplied to the load by using the system power supply, and the efficiency when power is supplied to the load by using the specific power supply. A derivation unit that derives the first set power and the second set power based on a derivation parameter including a second efficiency.
A first power control unit that controls the first variable unit so that the first supply power corresponding to the first set power is supplied to the load.
A second power control unit that controls the second variable unit so that the second supply power corresponding to the second set power is supplied to the load.
A power supply device characterized by being equipped with.

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