Power supply system, vehicle with the same, control method of power supply system and computer-readable recording medium bearing program causing computer to execute control method of power supply system

1. A power supply system capable of transferring power to and from a load device, comprising

first and second chargeable power storage devices;

a power line for transferring power between the power supply system and said load device;

first and second converters provided corresponding to said first and second power storage devices, respectively, and each performing voltage conversion between the corresponding power storage device and said power line; and

a control device controlling said first and second converters, wherein

said control device includes:

a first command producing unit producing a first power command for transferring power between the power supply system and said load device,

a second command producing unit producing a second power command for transferring a power between said first and second power storage devices when temperature increase control is performed for increasing a temperature of at least one of said first and second power storage devices, and

a control unit controlling said first and second converters such that the power indicated by said first power command is transferred between the power supply system and said load device, and power indicated by said second power command is transferred between said first and second power storage devices,

said first command producing unit divides said first power command into a first command value for said first converter and a second command value for said second converter in accordance with a predetermined distribution ratio,

said second command producing unit produces, as said second power command, a third command value for said first converter and a fourth command value for said second converter prepared by inverting a sign of said third command value, and

said control unit controls said first converter based on a command value prepared by adding said third command value to said first command value and controls said second converter based on a command value prepared by adding said fourth command value to said second command value.

2. The power supply system according to claim 1 , wherein

said second command producing unit produces said second power command when a temperature of at least one of said first and second power storage devices is lower than a specified value.

3. The power supply system according to claim 1 , wherein

said first command producing unit produces said first power command such that a voltage on said power line attains a predetermined value.

4. A vehicle comprising:

the power supply system according to claim 1 ; and

a drive power generating unit generating drive power of the vehicle by receiving power supplied from said power supply system.

5. A control method of a power supply system capable of transferring power to and from a load device, said power supply system including

first and second chargeable power storage devices,

a power line for transferring a power between the power supply system and said load device, and

first and second converters provided corresponding to said first and second power storage devices, respectively, and each performing voltage conversion between the corresponding power storage device and said power line,

said control method comprising:

a first step of producing a first power command for transferring a power between said power supply system and said load device,

a second step of producing a second power command for transferring a power between said first and second power storage devices when temperature increase control is performed for increasing a temperature of at least one of said first and second power storage devices, and

a third step of controlling said first and second converters such that power indicated by said first power command is transferred between said power supply system and said load device, and power indicated by said second power command is transferred between said first and second power storage devices,

said first step including the step of dividing said first power command into a first command value for said first converter and a second command value for said second converter in accordance with a predetermined distribution ratio,

said second step including the step of producing, as said second power command, a third command value for said first converter and a fourth command value for said second converter prepared by inverting a sign of said third command value, and

said third step including the step of controlling said first converter based on a command value prepared by adding said third command value to said first command value and controlling said second converter based on a command value prepared by adding said fourth command value to said second command value.

6. The control method according to claim 5 , wherein

in said second step, said second power command is produced when a temperature of at least one of said first and second power storage devices is lower than a specified value.

7. The control method according to claim 5 , wherein

in said first step, said first power command is produced such that a voltage on said power line attains a predetermined value.

8. A computer-readable recording medium bearing a program for causing a computer to execute the control method according to claim 5 .

9. A vehicle comprising:

the power supply system according to claim 2 ; and

a drive power generating unit generating drive power of the vehicle by receiving power supplied from said power supply system.

10. A vehicle comprising:

the power supply system according to claim 3 ; and

a drive power generating unit generating drive power of the vehicle by receiving power supplied from said power supply system.

11. A computer-readable recording medium bearing a program for causing a computer to execute the control method according to claim 6 .

12. A computer-readable recording medium bearing a program for causing a computer to execute the control method according to claim 7 .