Residential electric power storage system

• US 8,779,724 B2
• Filed: 12/28/2009
• Issued: 07/15/2014
• Est. Priority Date: 12/28/2009
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ichikawa, Shinji
• Primary Examiner(s): Tso, Edward
• Application Number:
  US13/514,129
• Publication Number:
  US 20120262124A1
• Time in Patent Office: 1,660 Days
• Field of Search: 320/109, 320/127, 320/128, 320/132, 320/134
• US Class Current: 320/134
• CPC Class Codes: B60L 53/51 Photovoltaic means
• CPC Class Codes: B60L 55/00 Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 58/14 Preventing excessive discharging
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 3/32 using batteries with converting means
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 3/466 Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: Y02B 10/10 Photovoltaic [PV]
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y02E 70/30 Systems combining energy storage with energy generation of non-fossil origin
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles
• CPC Class Codes: Y04S 10/126 the energy generation units being or involving electric vehicles [EV] or hybrid vehicles [HEV], i.e. power aggregation of EV or HEV, vehicle to grid arrangements [V2G]

Abstract

A controller includes a data accumulation unit that obtains data of an amount of electric power consumed in a residence and accumulates the obtained data a representative pattern creation unit that creates a representative pattern based on the data accumulated in the data accumulation unit, the pattern representatively indicating how the electric power storage device varies in state of charge for its discharging period and a limit value determination unit that determines a limit value to correspond to the pattern.

Claims

1. A residential electric power storage system comprising:

an electric power storage device configured to be capable of supplying a residence with electric power;

an electric power restriction unit following a limit value to restrict an amount of electric power discharged from said electric power storage device to the residence; and

a controller that determines said limit value and also controls said electric power restriction unit, said controller including

a data accumulation unit that obtains data of an amount of electric power consumed in the residence and accumulates said data obtained,

a representative pattern creation unit that creates a representative pattern based on said data accumulated in said data accumulation unit, said representative pattern representatively indicating said amount of electric power consumed in the residence for a discharging period of said electric power storage device, and

a limit value determination unit that determines said limit value so that an accumulated value for said discharging period of a smaller one of electric power determined by said pattern and electric power determined by said limit value has a value equal to a capacity that said electric power storage device can electrically discharge.

2. The residential electric power storage system according to claim 1, wherein:

said representative pattern creation unit creates a plurality of patterns;

said limit value determination unit determines a plurality of limit values corresponding to said plurality of patterns, respectively; and

said controller further includes a plan creation unit to select any of said patterns based on selection information and obtain from said limit value determination unit a limit value that corresponds to the selected pattern to create a plan to indicate how a target value for the state of charge of said electric power storage device transitions for said discharging period.

3. The residential electric power storage system according to claim 2, wherein said plan creation unit creates said plan to cause said electric power storage device to discharge within said discharging period an amount of electric power charged to and thus stored in said electric power storage device beyond a lower limit value set for the state of charge of said electric power storage device.

4. The residential electric power storage system according to claim 2, wherein said controller further includes:

a comparison unit that makes a comparison of said plan with an actual transition of the state of charge of said electric power storage device varying with an amount of electric power actually consumed in the residence; and

a correction unit that corrects said plan in accordance with a result of said comparison made by said comparison unit.

5. The residential electric power storage system according to claim 1, wherein:

said electric power storage device is configured to be capable of receiving electric power from a commercial power supply system and storing the received electric power therein; and

said electric power storage device has a charging period for which a lower power rate is set than that for said discharging period.

6. The residential electric power storage system according to claim 3, wherein said controller further includes:

a comparison unit that makes a comparison of said plan with an actual transition of the state of charge of said electric power storage device varying with an amount of electric power actually consumed in the residence; and

a correction unit that corrects said plan in accordance with a result of said comparison made by said comparison unit.