Electric power supply control system

• US 20010025209A1
• Filed: 02/27/2001
• Published: 09/27/2001
• Est. Priority Date: 04/24/1998
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Ishida, Takaharu, Fukui, Chihiro
• Granted Patent: US 7,478,070 B2
• Time in Patent Office: Days
• US Class Current: 700/291
• CPC Class Codes: G06Q 50/06 Energy or water supply
• CPC Class Codes: H02J 3/008 involving trading of energy or energy transmission rights
• CPC Class Codes: Y04S 50/10 Energy trading, including energy flowing from end-user application to grid

Abstract

With regard to electric-power-supply control, there is provided an electric power supply control system for implementing load control used to be executed for each individual customer consuming electric power as coordinated control for all customers and for selecting an optimum electric-power supplier in case there are a plurality of electric-power suppliers supplying electric power to the customers. Disclosed is the electric power supply control system for purchasing electric power from a plurality of electric-power suppliers and distributing purchased electric power to any arbitrary number of customers, the system comprising: an electric-power-purchase determining apparatus for selecting some of the electric-power suppliers and determining amounts of electric power to be purchased from the selected electric-power suppliers in accordance with a predetermined rule; an electric-power storage apparatus for storing electric power; and a demand control apparatus for transmitting electric power obtained by synthesizing electric power determined by the electric-power-purchase determining apparatus with electric power generated or absorbed by the electric-power storage apparatus to the customers.

Claims

1. An electric power supply control system for purchasing electric power from a plurality of electric-power suppliers and distributing purchased electric power to any arbitrary number of customers, said system comprising:

an electric-power-purchase determining apparatus for selecting some of said electric-power suppliers and determining amounts of electric power to be purchased from said selected electric-power suppliers in accordance with a predetermined rule;

an electric-power storage apparatus for storing electric power; and

a demand control apparatus for transmitting electric power obtained by synthesizing electric power determined by said electric-power-purchase determining apparatus with electric power generated or absorbed by said electric-power storage apparatus to said customers.

2. An electric power supply control system according to

claim 1

further having a measurement apparatus for measuring an operating state and an electric-power consumption of each electric-power consuming facility installed in each of said customers wherein said demand control apparatus compensates for a difference between an electric-power consumption of any of said customers assumed in advance and an actual electric-power consumption, if any, by using said electric-power storage apparatus.

3. An electric power supply control system according to

claim 2

wherein said demand control apparatus changes an amount of electric power transmitted to any particular one of said customers by opening and closing an opening/closing device inserted in series between said particular customer and an electric-power distributing facility employed in said electric power supply control system in case a measurement result produced by said measurement apparatus indicates that there is a difference between an electric-power consumption of said particular customer assumed in advance and an actual electric-power consumption.

4. An electric power supply control system according to

claim 3

wherein said electric-power-purchase determining apparatus determines an electric-power-quality quantitative index showing a quality of electric power received by said customers for each of said customers and determines an amount of electric power to be purchased in a range wherein a quality of electric power individually determined in advance for each of said customers can be sustained as indicated by said electric-power-quality quantitative index.

5. An electric power supply control system according to

claim 3

wherein said electric-power-purchase determining apparatus determines an electric-power-quality quantitative index showing a quality of electric power received by said customers for each of said customers and determines an amount of electric power to be transmitted individually to each of said customers in a range wherein a quality of electric power individually determined in advance for each of said customers can be sustained as indicated by said electric-power-quality quantitative index.

6. An electric power supply control system according to

claim 5

further having a demand forecasting apparatus for forecasting amounts of electric power consumed at the present time and a time in the future for each of said customers wherein said electric-power-purchase determining apparatus determines an amount of electric power to be purchased at a time in the future on the basis of a demand for electric power predicted by said demand forecasting apparatus.

7. An electric power supply control system according to

claim 6

further having a supply-contract-condition data base for storing an electric-power-supply contract made individually with each of said customers and an electric-power-purchase-contract-condition data base for storing an electric-power-purchase contract made individually with each of said electric-power suppliers wherein said demand control apparatus controls an electric-power consumption of each of said customers in a range wherein a minimum quality of electric power supplied to each of said customers can be sustained in case a total of amounts of electric power supplied to said customers violates a condition of said electric-power-purchase contract at any time.

8. An electric power supply control system according to

claim 7

wherein said demand control apparatus reduces the degree of violation of said electric-power-purchase contract by using said electric-power storage apparatus in case a total of amounts of electric power supplied to said customers violates a condition of said electric-power-purchase contract at any time.

9. An electric power supply control system according to

claim 8

wherein said demand control apparatus controls an electric-power consumption of each of said customers in a range wherein a minimum quality of electric power supplied to each of said customers can be sustained in case said violation of said electric-power-purchase contract can not be resolved by using said electric-power storage apparatus.