Power control method, and power control apparatus

• US 8,694,176 B2
• Filed: 03/28/2011
• Issued: 04/08/2014
• Est. Priority Date: 04/16/2010
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Yamamoto, Hiroshi, Ushiki, Kazumasa, Tsunoda, Tadanobu, Fujino, Nobutsugu
• Primary Examiner(s): Hartman, Jr., Ronald D.
• Application Number:
  US13/072,886
• Publication Number:
  US 20110257803A1
• Time in Patent Office: 1,107 Days
• Field of Search: 700/286, 700/291, 700/295, 700/297
• US Class Current: 700/297
• CPC Class Codes: G06F 1/263 Arrangements for using multiple switchable power supplies, e.g. battery and AC G06F1/30 takes precedence
• CPC Class Codes: G06F 1/28 Supervision thereof, e.g. detecting power-supply failure by out of limits supervision
• CPC Class Codes: G06F 1/305 in the event of power-supply fluctuations

Abstract

A power control method for a power supplying unit for supplying power from a commercial power supply and a battery to a load. The method includes (a) calculating a deviation amount between an actual power demand and a predicted power demand in a predetermined unit period on the basis of power demand transition data and power demand prediction data, (b) correcting, by a computer, a leveling target value on the basis of the calculated deviation amount, and (c) controlling the power supplying unit so that the power supplying unit supplies power corresponding to the corrected leveling target value from the commercial power supply. The power demand transition data is stored in a power database, and the power demand prediction data is stored in a prediction data storing unit. The leveling target value is a target value of power to be supplied from the commercial power supply.

Claims

1. A power control method for a power supplying unit for supplying power from a commercial power supply and a battery to a load, comprising:

calculating a deviation amount between an actual power demand and a predicted power demand in a predetermined unit period on the basis of power demand transition data and power demand prediction data, the power demand transition data being stored in a power database, the power demand prediction data being stored in a prediction data storing unit;

correcting a leveling target value on the basis of the calculated deviation amount, the leveling target value being a target value of power to be supplied from the commercial power supply; and

controlling the power supplying unit so that the power supplying unit supplies power corresponding to the corrected leveling target value from the commercial power supply.

2. The power control method according to claim 1, further comprising:

predicting, for each of a plurality of candidate values for the leveling target value, power to be supplied from the commercial power supply during a predetermined period on the basis of the each candidate value, data on a battery specification and the power demand prediction data; and

selecting one of the candidate values as the leveling target value, a peak value of the power predicted for the one of the candidate values being smallest among the plurality of candidate values.

3. The power control method according to claim 2,

wherein the predicting includes:

calculating, for each of the plurality of candidate values, charge and discharge amounts of the battery on the basis of the each candidate value, the data on the battery specification and the power demand prediction data,

predicting a remaining battery level on the basis of the charge and discharge amounts of the battery, and

predicting, for each of a plurality of candidate values, the power to be supplied from the commercial power supply during the predetermined period on the basis of the each candidate value, the power demand prediction data and data on the predicted remaining battery level.

4. The power control method according to claim 1, further comprising:

predicting, for each of a plurality of candidate values for the leveling target value, power to be supplied from the commercial power supply during a predetermined period on the basis of the each candidate value, data on a battery specification and the power demand prediction data;

calculating, for each of the plurality of candidate values, a exhausted amount of carbon dioxide during the predetermined period on the basis of data on the predicted power and data on an amount of carbon dioxide exhausted by generation of a unit amount of electricity; and

selecting one of the candidate values as the leveling target value, a determination value being smallest among the plurality of candidate values, the determination value being defined by a peak value of the power predicted for the one of the candidate values and the exhausted amount of carbon dioxide calculated for the one of the candidate values.

5. The power control method according to claim 4,

wherein the predicting includes:

calculating, for each of the plurality of candidate values, charge and discharge amounts of the battery on the basis of the each candidate value, the data on the battery specification and the power demand prediction data

predicting a remaining battery level on the basis of the charge and discharge amounts of the battery, and

predicting, for each of a plurality of candidate values, the power to be supplied from the commercial power supply during the predetermined period on the basis of the each candidate value, the power demand prediction data and data on the predicted remaining battery level.

6. A power control method for a power supplying unit for supplying power from a commercial power supply and a battery to a load, comprising:

calculating a deviation amount between an actual remaining battery level and a predicted remaining battery level in a predetermined unit period on the basis of battery level transition data and data on the predicted remaining battery level, the battery level transition data being stored in a battery database;

correcting a leveling target value on the basis of the calculated deviation amount, the leveling target value being a target value of power to be supplied from a commercial power supply; and

controlling the power supplying unit so that the power supplying unit supplies power corresponding the corrected leveling target value from the commercial power supply.

7. The power control method according to claim 6, further comprising:

predicting a remaining battery level on the basis of the leveling target value, data on a battery specification and power demand prediction data, the power demand prediction data being stored in a prediction data storing unit.

8. A power control apparatus for a power supplying unit for supplying power from a commercial power supply and a battery to a load, comprising:

a deviation calculation unit for calculating a deviation amount between an actual power demand and a predicted power demand in a predetermined unit period on the basis of power demand transition data and power demand prediction data, the power demand transition data being stored in a power database, the power demand prediction data being stored in a prediction data storing unit;

a correction unit for correcting a leveling target value on the basis of the calculated deviation amount, the leveling target value being a target value of power to be supplied from the commercial power supply; and

a control unit for controlling the power supplying unit so that the power supplying unit supplies power corresponding to the corrected leveling target value from the commercial power supply.

9. The power control apparatus according to claim 8, further comprising:

a power prediction unit for predicting, for each of a plurality of candidate values for the leveling target value, power to be supplied from the commercial power supply during a predetermined period on the basis of the each candidate value, data on a battery specification and the power demand prediction data; and

a selection unit for selecting one of the candidate values as the leveling target value, a peak value of the power predicted for the one of the candidate values being smallest among the plurality of candidate values.

10. The power control apparatus according to claim 9,

wherein the power prediction unit includes:

a charge and discharge calculation unit for calculating, for each of the plurality of candidate values, charge and discharge amounts of the battery on the basis of the each candidate value, the data on the battery specification and the power demand prediction data, and

a battery level prediction unit for predicting a remaining battery level on the basis of the charge and discharge amounts of the battery,

wherein the power prediction unit predicts, for each of a plurality of candidate values, the power to be supplied from the commercial power supply during the predetermined period on the basis of the each candidate value, the power demand prediction data and data on the predicted remaining battery level.

11. The power control apparatus according to claim 8, further comprising:

a power prediction unit for predicting, for each of a plurality of candidate values for the leveling target value, power to be supplied from the commercial power supply during a predetermined period on the basis of the each candidate value, data on a battery specification and the power demand prediction data;

an exhaustion calculation unit for calculating, for each of the plurality of candidate values, a exhausted amount of carbon dioxide during the predetermined period on the basis of data on the predicted power and data on an amount of carbon dioxide exhausted by generation of a unit amount of electricity; and

a selection unit for selecting one of the candidate values as the leveling target value, a determination value being smallest among the plurality of candidate values, the determination value being defined by a peak value of the power predicted for the one of the candidate values and the exhausted amount of carbon dioxide calculated for the one of the candidate values.

12. The power control apparatus according to claim 11,

wherein the power prediction unit includes:

a charge and discharge calculation unit for calculating, for each of the plurality of candidate values, charge and discharge amounts of the battery on the basis of the each candidate value, the data on the battery specification and the power demand prediction data, and

a battery level prediction unit for predicting a remaining battery level on the basis of the charge and discharge amounts of the battery,

wherein the power prediction unit predicts, for each of a plurality of candidate values, the power to be supplied from the commercial power supply during the predetermined period on the basis of the each candidate value, the power demand prediction data and data on the predicted remaining battery level.

13. A power control apparatus for a power supplying unit for supplying power from a commercial power supply and a battery to a load, comprising:

a calculation unit for calculating a deviation amount between an actual remaining battery level and a predicted remaining battery level in a predetermined unit period on the basis of battery level transition data and data on the predicted remaining battery level, the battery level transition data being stored in a battery database;

a correction unit for correcting a leveling target value on the basis of the calculated deviation amount, the leveling target value being a target value of power to be supplied from a commercial power supply; and

a control unit for controlling the power supplying unit so that the power supplying unit supplies power corresponding the corrected leveling target value from the commercial power supply.

14. The power control apparatus according to claim 13, further comprising:

a battery level prediction unit for predicting a remaining battery level on the basis of the leveling target value, data on a battery specification and power demand prediction data, the power demand prediction data being stored in a prediction data storing unit.