ELECTRIC POWER SUPPLY SYSTEM AND METHOD FOR CONTROLLING ELECTRIC POWER DISCHARGE

• US 20120229077A1
• Filed: 03/06/2012
• Published: 09/13/2012
• Est. Priority Date: 03/07/2011
• Status: Abandoned Application

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Tsuchiya, Shizuo
• Application Number:
  US13/412,981
• Publication Number:
  US 20120229077A1
• Time in Patent Office: Days
• US Class Current: 320/107
• CPC Class Codes: H02J 2300/22 The renewable source being solar energy
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 2310/14 The load or loads being home appliances
• CPC Class Codes: H02J 3/003 Load forecast, e.g. methods or systems for forecasting future load demand
• 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: Y02B 70/30 Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
• CPC Class Codes: Y02B 70/3225 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers
• CPC Class Codes: Y02E 70/30 Systems combining energy storage with energy generation of non-fossil origin
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 20/242 Home appliances

Abstract

An electric power accumulating device is charged with electric power supplied from an electric power system and is configured to discharge electric power to a load device. A control unit predicts, with reference to an electric power consumption result of the load device, an electric power consumption of the load device in each time zone in one day and determines, according to the predicted electric power consumption, a discharge implementation time zone or a discharge threshold. The control unit causes the electric power accumulating device to discharge electric power to the load device when determining that the present time is in the discharge implementation time zone or when an electric power consumed by the load device is greater than or equal to the determined discharge threshold.

Claims

1. An electric power supply system comprising:

an electric power accumulating device configured to be charged with electric power, which is supplied from an electric power system into a building under a contract, and configured to discharge electric power to a load device of the building;

a control device configured to

store an electric power consumption result of the load device,

rewrite a previous electric power consumption result to update the electric power consumption result as learning information, and

control electric power discharge from the electric power accumulating device to the load device with reference to the learning information, wherein

the control unit is further configured to

predict, with reference to the learning information, an electric power consumption consumed by the load device in each time zone in one day,

determine, according to the predicted electric power consumption in each time zone in one day, a discharge implementation time zone or a discharge threshold, and

implement electric power discharge from the electric power accumulating device to the load device,

when determining that present time is in the discharge implementation time zone in one day, or

when a load electric power consumed by the load device is greater than or equal to the determined discharge threshold.

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

the control unit is further configured to

obtain fluctuation in actual load electric power actually consumed by the load device when implementing electric power discharge from the electric power accumulating device,

determine, according to the obtained fluctuation in the actual load electric power, a discharge termination value, and

terminate electric power discharge from the electric power accumulating device when the actual load electric power becomes less than or equal to the discharge termination value.

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

the control unit is further configured to

determine, with reference to the learning information, a high electric power consumption time zone, in which the load electric power consumed by the load device is predicted to concentrate in one day, and

implement electric power discharge from the electric power accumulating device in the high electric power consumption time zone with priority, when determining that accumulation of electric power in the electric power accumulating device cannot cover

the load electric power predicted to be consumed in time zones other than the high electric power consumption time zone and

the load electric power predicted to be consumed in the high electric power consumption time zone.

4. A method for controlling electric power discharge from an electric power accumulating device, the electric power accumulating device being configured to be charged with electric power, which is supplied from an electric power system into a building under a contract, and configured to discharge electric power to a load device of the building, the method comprising:

predicting an electric power consumption consumed by the load device in each time zone in one day, with reference to an electric power consumption result of the load device being stored and updated;

determining, according to the predicted electric power consumption, a discharge implementation time zone or a discharge threshold; and

causing the electric power accumulating device to discharge electric power to the load device,

when determining that present time is in the discharge implementation time zone, or

when a load electric power consumed by the load device is greater than or equal to the determined discharge threshold.