ELECTRIC POWER SUPPLY SYSTEM

• US 20120206104A1
• Filed: 02/14/2012
• Published: 08/16/2012
• Est. Priority Date: 02/15/2011
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Tsuchiya, Shizuo
• Granted Patent: US 9,368,969 B2
• Time in Patent Office: Days
• US Class Current: 320/134
• 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: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 2300/22 The renewable source being solar energy
• CPC Class Codes: H02J 3/322 the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• 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

An alternating-current power line is wired in a building for supplying alternating-current electricity to an electric load. A bidirectional power converter converts bilaterally between alternating-current electricity and direct-current electricity. A power storage unit is connected to the alternating-current power line through the bidirectional power converter. The power storage unit is charged with electricity from the alternating-current power line and discharges direct-current electricity into the alternating-current power line. A charge-and-discharge unit charges a vehicular power accumulating device with alternating-current electricity supplied from the alternating-current power line through a connecting terminal and discharges electricity outputted as alternating-current electricity from the vehicle to the connecting terminal. A power converter converts alternating-current electricity outputted from the vehicle through the connecting terminal into direct-current electricity and discharges the converted direct-current electricity through the bidirectional power converter into the alternating-current power line.

Claims

1. An electric power supply system comprising:

an alternating-current power line wired in a building and connected to an electric load for supplying alternating-current electricity to the electric load;

a bidirectional power converter configured to convert bilaterally between alternating-current electricity and direct-current electricity;

a power storage unit connected to the alternating-current power line through the bidirectional power converter and configured to

be charged with electricity from the alternating-current power line and

discharge direct-current electricity stored in the power storage unit into the alternating-current power line;

a charge-and-discharge unit equipped with a connecting terminal portion connectable with a vehicle and configured to

charge a vehicular power accumulating device equipped in the vehicle with alternating-current electricity supplied from the alternating-current power line through the connecting terminal portion to the vehicle and

discharge electricity of the vehicular power accumulating device outputted as alternating-current electricity from the vehicle to the connecting terminal portion, wherein

the charge-and-discharge unit includes a power converter configured to

convert alternating-current electricity outputted from the vehicle through the connecting terminal portion into direct-current electricity and

discharge direct-current electricity converted with the power converter through the bidirectional power converter into the alternating-current power line.

2. The electric power supply system according to claim 1, wherein

the charge-and-discharge unit further includes a control unit configured to control discharge of electricity from the vehicular power accumulating device according to a state of electricity accumulation in the power storage unit and information on the vehicle, and

the control unit is further configured to operate the power converter to discharge electricity outputted from the vehicle through the bidirectional power converter into the alternating-current power line only in a condition where

electricity supplied to the electric load is insufficient only with electricity discharged from the power storage unit into the alternating-current power line, and

determining, according to the information on the vehicle, that the vehicular power accumulating device stores surplus electricity.

3. The electric power supply system according to claim 2, wherein

the charge-and-discharge unit further includes:

an announcement unit configured to notify recommendation to discharge electricity outputted from the vehicle into the alternating-current power line; and

a permission state setting unit configured to set a permission state on the vehicle to output electricity,

the control unit is further configured to

operate the announcement unit to notify the recommendation, in a condition where

electricity supplied to the electric load is insufficient only with electricity discharged from the power storage unit into the alternating-current power line, and

determining, according to the information on the vehicle, that the vehicular power accumulating device stores surplus electricity and

operate the power converter to discharge electricity outputted from the vehicle through the bidirectional power converter into the alternating-current power line, only in a condition where the permission state setting unit is thereafter operated to set the permission state.

4. An electric power supply system comprising:

an alternating-current power line wired in a building and connected to an electric load for supplying alternating-current electricity to the electric load;

a bidirectional power converter configured to convert bilaterally between alternating-current electricity and direct-current electricity;

a power storage unit connected to the alternating-current power line through the bidirectional power converter and configured to

be charged with electricity from the alternating-current power line and

discharge direct-current electricity stored in the power storage unit into the alternating-current power line;

an alternating-current charge-and-discharge unit equipped with a first connecting terminal portion connectable with a vehicle and configured to

charge a vehicular power accumulating device equipped in the vehicle with alternating-current electricity supplied from the alternating-current power line through the first connecting terminal portion to the vehicle and

discharge alternating-current electricity outputted from the vehicular power accumulating device to the first connecting terminal portion when the vehicular power accumulating device discharges the alternating-current electricity; and

a direct-current discharge unit equipped with a second connecting terminal portion connectable with the vehicle and configured to discharge direct-current electricity outputted from the vehicle to the second connecting terminal portion when the vehicular power accumulating device discharges the direct-current electricity, wherein

the alternating-current charge-and-discharge unit includes a power converter configured to convert alternating-current electricity outputted from the vehicle to the first connecting terminal portion into direct-current electricity,

the alternating-current charge-and-discharge unit is configured to discharge direct-current electricity converted with the power converter through the bidirectional power converter into the alternating-current power line, and

the direct-current discharge unit is further configured to discharge direct-current electricity, which is outputted from the vehicle to the second connecting terminal portion, through the bidirectional power converter into the alternating-current power line.

5. The electric power supply system according to claim 4, wherein

the alternating-current charge-and-discharge unit and the direct-current discharge unit commonly include a control unit configured to control discharge of electricity from the vehicular power accumulating device according to a state of electricity accumulation in the power storage unit and information on the vehicle,

the control unit is further configured to cause discharge of electricity outputted from the vehicle through the bidirectional power converter into the alternating-current power line only in a condition where

electricity supplied to the electric load is insufficient only with electricity discharged from the power storage unit into the alternating-current power line, and

determining, according to the information on the vehicle, that the vehicular power accumulating device stores surplus electricity.

6. The electric power supply system according to claim 5, further comprising:

an announcement unit configured to notify recommendation to discharge electricity outputted from the vehicle into the alternating-current power line; and

a permission state setting unit configured to set a permission state on the vehicle to output electricity, wherein

the control unit is further configured to

operate the announcement unit to notify the recommendation, in a condition where

electricity supplied to the electric load is insufficient only with electricity discharged from the power storage unit into the alternating-current power line, and

determining, according to the information on the vehicle, that the vehicular power accumulating device stores surplus electricity and

cause discharge of electricity outputted from the vehicle through the bidirectional power converter into the alternating-current power line, only in a condition where the permission state setting unit is thereafter operated to set the permission state.