Charge and discharge control device, charge control method, discharge control method, and program

1. A charge and discharge control device configured to control charge and discharge of a secondary battery coupled to a load capable of generating a regenerative power, the charge and discharge control device comprising:

a peak cutting unit configured to, in a case that a required power required by the load is larger than or equal to a reception peak-cut power set as a power receivable from a wire, have the secondary battery discharged at a power rate that is larger or equal to a difference between the required power and the reception peak-cut power;

an improving power value calculating unit configured to calculate a discharge improving power value defined as a power value that increases as a charging rate of the secondary battery becomes larger than a target charging rate; and

a charging rate improving unit configured to, in a case that the required power is smaller than or equal to the reception peak-cut power, have the secondary battery discharged at a power rate that is smaller than or equal to the discharge improving power value calculated by the improving power value calculating unit.

2. The charge and discharge control device according to claim 1 , wherein the peak cutting unit is configured to have the secondary battery discharged at a power rate equal to the discharge improving power value, in a case that the required power is larger than or equal to the reception peak-cut power, and the discharge improving power value is larger than or equal to a value of a difference between the required power and the reception peak-cut power.

3. The charge and discharge control device according to claim 1 , wherein the peak cutting unit is configured to have the secondary battery discharged at a power rate that is smaller than a maximum discharge power value for discharge allowed by the secondary battery.

4. The charge and discharge control device according to claim 1 , further comprising:

a discharge terminating unit configured to terminate discharge by the peak cutting unit in a case that the charging rate of the secondary battery is smaller than a minimum charging rate allowed to the secondary battery.

5. The charge and discharge control device according to claim 1 , wherein the peak cutting unit is configured to, in a case that a regenerative power generated by the load is larger than or equal to a transmission peak-cut power set as a power transmittable to a wire, have the secondary battery charged at a power rate that is larger than or equal to a difference between the regenerative power and the transmission peak-cut power,

the improving power value calculating unit is configured to calculate a charge improving power value defined as a power value that increases as the charging rate of the secondary battery becomes lower than the target charging rate of the secondary battery, and

the charging rate improving unit is configured to, in a case that the regenerative power is smaller than or transmission peak-cut power, have the secondary battery charged at a power rate that is smaller than or equal to the charge improving power value calculated by the improving power value calculating unit.

6. The charge and discharge control device according to claim 5 , wherein the peak cutting unit is configured to have the secondary battery charged at a power rate equal to the charge improving power value, in a case that the regenerative power is larger than or equal to the transmission peak-cut power, and the charge improving power value is larger than or equal to a difference between the regenerative power and the transmission peak-cut power.

7. The charge and discharge control device according to claim 5 , wherein the peak cutting unit is configured to have the secondary battery charged at a power rate that is smaller than a maximum charge power value for charge allowed by the secondary battery.

8. The charge and discharge control device according to claim 5 , further comprising:

a charge terminating unit configured to terminate charge by the peak cutting unit in a case that the charging rate of the secondary battery exceeds a maximum charging rate allowed to the secondary battery.

9. A charge and discharge control device configured to control charge and discharge of a secondary battery coupled to a load capable of generating a regenerative power, the charge and discharge control device comprising:

a peak cutting unit configured to, in a case that a regenerative power generated by the load is larger than or equal to a transmission peak-cut power set as a power transmittable to a wire, have the secondary battery charged at a power rate that is larger or equal to a difference between the regenerative power and the transmission peak-cut power;

an improving power value calculating unit configured to calculate a charge improving power value defined as a power value that increases as a charging rate of the secondary battery becomes smaller than a target charging rate; and

a charging rate improving unit configured to, in a case that the regenerative power is smaller than or equal to the transmission peak-cut power, have the secondary battery charged at a power rate that is smaller than or equal to the charge improving power value calculated by the improving power value calculating unit.

10. The charge and discharge control device according to claim 9 , wherein the peak cutting unit is configured to have the secondary battery charged at a power rate equal to the charge improving power value, in a case that the regenerative power is larger than or equal to the transmission peak-cut power, and the charge improving power value is larger than or equal to a value of a difference between the regenerative power and the transmission peak-cut power.

11. A charge and discharge control method using a charge and discharge control device configured to control charge and discharge of a secondary battery coupled to a load capable of generating a regenerative power, the charge and discharge control method comprising:

comparing a power required by the load with a reception peak-cut power set as a power receivable from a wire:

in a case that the required power is larger than or equal to the reception peak-cut power, discharging, by a peak cutting unit, the secondary battery at a power rate that is larger than or equal to a difference between the required power and the reception peak-cut power;

calculating, by an improving power value calculating unit, a discharge improving power value defined as a power value that increases as a charging rate of the secondary battery becomes larger than a target charging rate; and

in a case that the required power is smaller than or equal to the reception peak-cut power, discharging, by a charging rate improving unit, the secondary battery at a power rate that is smaller than or equal to the discharge improving power value calculated by the improving power value calculating unit.

12. A charge and discharge control method using a charge and discharge control device configured to control charge and discharge of a secondary battery coupled to a load capable of generating a regenerative power, the charge and discharge control device comprising:

comparing a regenerative power required by the load with a transmission peak-cut power set as a power transmittable to a wire;

in a case that the regenerative power is larger than or equal to the transmission peak-cut power, charging, by a peak cutting unit, the secondary battery at a power rate that is larger than or equal to a difference between the regenerative power and the transmission peak-cut power;

calculating, an improving power value calculating unit, a charge improving power value defined as a power value that increases as a charging rate of the secondary battery becomes smaller than a target charging rate; and

in a case that the regenerative power is smaller than or equal to the transmission peak-cut power, charging, by a charging rate improving unit, the secondary battery charged at a power rate that is smaller than or equal to the charge improving power value calculated by the improving power value calculating unit.

13. A non-transitory computer readable medium having embedded thereon a program, which when executed by a processor, causes the processor to configure a charge and discharge control device configured to control charge and discharge of a secondary battery coupled to a load capable of generating a regenerative power, the charge and discharge control device comprising:

a peak cutting unit configured to, in a case that a required power required by the load is larger than or equal to a reception peak-cut power set as a power receivable from a wire, have the secondary battery discharged at a power rate that is larger or equal to a difference between the required power and the reception peak-cut power;

an improving power value calculating unit configured to calculate a discharge improving power value defined as a power value that increases as a charging rate of the secondary battery becomes larger than a target charging rate; and

a charging rate improving unit configured to, in a case that the required power is smaller than or equal to the reception peak-cut power, have the secondary battery discharged at a power rate that is smaller than or equal to the discharge improving power value calculated by the improving power value calculating unit.

14. A non-transitory computer readable medium having embedded thereon a program, which when executed by a processor, causes the processor to configure a charge and discharge control device configured to control charge and discharge of a secondary battery coupled to a load capable of generating a regenerative power, the charge and discharge control device comprising:

a peak cutting unit configured to, in a case that a regenerative power generated by the load is larger than or equal to a transmission peak-cut power set as a power transmittable to a wire, have the secondary battery charged at a power rate that is larger or equal to a difference between the regenerative power and the transmission peak-cut power;

an improving power value calculating unit configured to calculate a charge improving power value defined as a power value that increases as a charging rate of the secondary battery becomes smaller than a target charging rate; and

a charging rate improving unit configured to, in a case that the regenerative power is smaller than or equal to the transmission peak-cut power, have the secondary battery charged at a power rate that is smaller than or equal to the charge improving power value calculated by the improving power value calculating unit.