SECONDARY BATTERY SYSTEM

• US 20110278930A1
• Filed: 05/17/2011
• Published: 11/17/2011
• Est. Priority Date: 11/19/2008
• Status: Active Grant

• Current Assignee: Japan Wind Development Corporation, Ltd.
• Original Assignee: Japan Wind Development Corporation, Ltd.
• Inventors: BANDO, Matsuo, TAMAKOSHI, Tomio, YASUTOMI, Sei
• Granted Patent: US 9,214,814 B2
• Time in Patent Office: Days
• US Class Current: 307/65
• CPC Class Codes: H02J 3/32 using batteries with converting means
• CPC Class Codes: H02J 3/38 Arrangements for parallely feeding a single network by two or more generators, converters or transformers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

There is provided a secondary battery system which converts direct current power supplied from secondary batteries into alternating current power by power converters, and supplies the converted power to an electric power system on a load side, the secondary battery system including a control apparatus that stops operating the operating the power converter and starts operating the stopped the power converter when a residual stored power level of the secondary battery corresponding to operating the power converter becomes to be not greater than a predetermined rate of a residual stored power level of the secondary battery corresponding to stopped the power converter.

Claims

1. A secondary battery system comprising:

two or more secondary batteries;

two or more power conversion units, which are provided respectively corresponding to the two or more secondary batteries, convert electric power supplied respectively from corresponding one of the two or more secondary batteries;

a detection unit which detects that a residual stored power level of the secondary battery corresponding to one of the power conversion units operating becomes to be not greater than a predetermined rate of a residual stored power level of the secondary battery corresponding to stopped the power conversion units; and

a operation switch unit which stops operation of the power conversion unit corresponding to the secondary battery whose residual stored power level is a target to be detected by the detection unit, and starts operation of the stopped the power conversion unit.

2. A control apparatus for a secondary battery system which controls two or more power converters which are provided respectively corresponding to two or more secondary batteries and convert electric power supplied respectively from corresponding one of the two or more secondary batteries, the control apparatus comprising:

a detection unit which detects that a residual stored power level of the secondary battery corresponding to one of the power converters operating becomes to be not greater than a predetermined rate of a residual stored power level of the secondary battery corresponding to stopped the power converter; and

an operation switch unit which stops operation of the power converter corresponding to the secondary battery whose residual stored power level is a target to be detected by the detection unit, and starts operation of the stopped the power converter.

3. A control method for a secondary battery system, which controls two or more power converters which are provided respectively corresponding to two or more secondary batteries and convert electric power supplied respectively from corresponding one of the two or more secondary batteries, the control method comprising:

detecting that a residual stored power level of the secondary battery corresponding to one of the power converters operating becomes to be not greater than a predetermined rate of a residual stored power level of the secondary battery corresponding to stopped one of the power converters; and

stopping operation of the one of the power converters corresponding to the one of the secondary batteries whose residual stored power level is a target to be detected in the detection step, and starting operation of the stopped one of the power converters.

4. A secondary battery system comprising:

two or more secondary batteries;

two or more power conversion units which are provided respectively corresponding to the two or more secondary batteries and convert electric power supplied respectively from corresponding one of the two or more secondary batteries; and

an operation switch unit which stops operation of the power conversion unit which has been operated continuously for a predetermined time period and starts operation of stopped the power conversion unit each time the predetermined time period elapses, when maximum power generation at time that one of the power conversion units has been stopped exceeds a required power supplied to a load side.

5. A control apparatus for a secondary battery system which controls two or more power converters which are provided respectively corresponding to two or more secondary batteries and convert electric power supplied respectively from corresponding one of the two or more secondary batteries, the control apparatus comprising:

an operation switch unit which stops operation of the power converter which has been operated continuously for a predetermined time period and starts operation of stopped the power converter each time the predetermined time period elapses, when maximum power generation at time that one of the power converters has been stopped exceeds a required power supplied to a load side.

6. A control method for a secondary battery system, which controls two or more power converters which are provided respectively corresponding to two or more secondary batteries and convert electric power supplied respectively from corresponding one of the two or more secondary batteries, the control method comprising:

stopping operation of the power converter which has been operated continuously for a predetermined time period and starting operation of stopped the power converter each time the predetermined time period elapses, when maximum power generation at time that one of the power converters has been stopped exceeds a required power supplied to a load side.