ELECTRIC POWER SUPPLY SYSTEM

• US 20120323386A1
• Filed: 05/31/2012
• Published: 12/20/2012
• Est. Priority Date: 06/14/2011
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: ITO, Akira
• Granted Patent: US 8,744,641 B2
• Time in Patent Office: Days
• US Class Current: 700/291
• CPC Class Codes: B60L 2260/54 Energy consumption estimation
• CPC Class Codes: B60L 53/30 Constructional details of charging stations
• CPC Class Codes: B60L 53/51 Photovoltaic means
• CPC Class Codes: B60L 53/53 Batteries
• CPC Class Codes: B60L 53/63 in response to network capacity
• CPC Class Codes: B60L 53/68 Off-site monitoring or control, e.g. remote control
• 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 2310/12 The local stationary network supplying a household or a building
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 3/004 Generation forecast, e.g. methods or systems for forecasting future energy generation
• 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 7/35 with light sensitive cells
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y02P 80/10 Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
• 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: Y02T 90/167 Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
• 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]
• CPC Class Codes: Y04S 30/12 : Remote or cooperative charging

Abstract

An electric power supply system has, as multiple storage units, an output type battery of high output and small capacity and a capacity type battery of low output and large capacity. The charge-discharge electric power of each of the storage units is controlled by a controller according to a charge-discharge schedule for a prediction period. Based on a predicted power consumption schedule, a predicted power generation schedule, and a charge-discharge characteristic of each of the storage units, the controller determines a charge-discharge schedule with regards to an optimal evaluation index, and controls the storage units in accordance with the charge-discharge schedule.

Claims

1. An electric power supply system in a building for receiving an electric power from a power system of a power supplier and for providing the electric power through a wiring to an electric load, the electric power supply system comprising:

a photovoltaic power generation unit generating photovoltaic electric power from sun light;

a plurality of storage units storing the photovoltaic electric power from the photovoltaic power generation unit and the electric power from the power system, the plurality of storage units being coupled to the wiring of the building for discharging the electric power stored; and

a consumption control unit controlling consumption of the electric power stored in the storage units from consumption by the electric load, by the storing of the electric power in each of the plurality of storage units, and by a reverse-flow of electric power back to the power system, wherein

the plurality of storage units include at least two types of storage units with respectively different charge-discharge characteristics including an output type storage unit of high output and small capacity and a capacity type storage unit of low output and large capacity,

the consumption control unit determines for each of the storage units a charge-discharge schedule to control a charge-discharge of electric power of each of the storage units during a prediction period based on (i) a predicted power consumption schedule providing transitional electric power consumption during the prediction period by the electric load based on a use history of the electric load, (ii) a predicted power generation schedule providing transitional electric power generation during the prediction period by the photovoltaic power generation unit based on forecasted weather, and (iii) the charge-discharge characteristics of each of the storage units, and

the consumption control unit determines the charge-discharge schedule by way of an evaluation index, the evaluation index is calculated for a charge-discharge schedule, and the consumption control unit controls the charge-discharge of electric power of each of the storage units according to the charge-discharge schedule having an optimal evaluation index.

2. The electric power supply system of claim 1, further comprising:

an in-vehicle storage unit of a vehicle, the in-vehicle storage unit storing and discharging electric power to the wiring and being an output type storage unit, and

the consumption control unit determines the charge-discharge schedule as having an optimal evaluation index, based on the predicted power consumption schedule, the predicted power generation schedule, a connection period during which the in-vehicle storage unit is electrically coupled to the wiring, and the charge-discharge characteristics of each of the plurality of storage units including the in-vehicle storage unit.

3. The electric power supply system of claim 1, wherein

the evaluation index is an electric power price balance that is calculated by subtracting a sell price of electric power according to the amount of reverse-flow of electric power back to the wiring from a purchase price of electric power according to the amount of electric power from the wiring, and

the optimal evaluation index is an electric power price balance having the lowest value.

4. The electric power supply system of claim 1, wherein

the evaluation index is an emission amount of carbon dioxide according to the amount of electric power from the wiring, and

the optimal evaluation index is an emission amount having the lowest value.