ELECTRIC POWER MANAGEMENT SYSTEM
First Claim
1. An electric power management system which controls charging and discharging of an electricity storage unit which is charged by electric power from an electric power supply and which discharges the stored electric power to a load, the system comprising:
- a detection unit which detects a state of charge of each of a plurality of storage battery packs included in the electricity storage unit; and
a control unit which controls the charging and the discharging of the electricity storage unit according to the detected state of charge, whereinthe detection unit detects, in a wait state in which the electricity storage unit is not charging or discharging, the state of charge using accumulated values of charging and discharging currents until the wait state continues for a predetermined period, and detects the state of charge using a correlation relationship between an open end voltage and the state of charge when the wait state has continued for the predetermined period.
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Accused Products
Abstract
An electric power management system is provided which executes charge and discharge control by detecting a state of charge of a storage battery pack with a high precision and controls charging and discharging of a storage battery system comprising a plurality of storage battery units. A total storage battery unit manager calculates an SOC of all storage battery packs in the storage battery system, and controls charging and discharging based on the calculated SOC. When a wait state, where the storage battery system is not charging or discharging, continues for a predetermined period, the SOC is calculated using a correlation relationship between an electromotive force and the SOC, to remove the influence of hysteresis.
47 Citations
7 Claims
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1. An electric power management system which controls charging and discharging of an electricity storage unit which is charged by electric power from an electric power supply and which discharges the stored electric power to a load, the system comprising:
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a detection unit which detects a state of charge of each of a plurality of storage battery packs included in the electricity storage unit; and a control unit which controls the charging and the discharging of the electricity storage unit according to the detected state of charge, wherein the detection unit detects, in a wait state in which the electricity storage unit is not charging or discharging, the state of charge using accumulated values of charging and discharging currents until the wait state continues for a predetermined period, and detects the state of charge using a correlation relationship between an open end voltage and the state of charge when the wait state has continued for the predetermined period. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electric power management system which controls charging and discharging of an electricity storage unit which is charged by electric power from an electric power supply and which discharges the stored electric power to a load, the system comprising:
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a detection unit which detects a state of charge of each of a plurality of storage battery packs included in the electricity storage unit; and a control unit which controls the charging and the discharging of the electricity storage unit according to the detected state of charge, wherein the detection unit detects the state of charge using accumulated values of charging and discharging currents until a state where an amount of change of voltage per unit time is less than or equal to a threshold value has continued for a predetermined period, and detects the state of charge using a correlation relationship between an open end voltage and the state of charge when the state continues for the predetermined period.
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Specification