Subscriber electric power load control system

• US 5,168,170 A
• Filed: 09/07/1989
• Issued: 12/01/1992
• Est. Priority Date: 09/07/1989
• Status: Expired due to Fees

• Current Assignee: Trustees of Boston University
• Original Assignee: Lexington Power Management Corporation
• Inventors: Hartig, Kent
• Primary Examiner(s): Pellinen, A. D.
• Assistant Examiner(s): Osborn, David
• Application Number:
  US07/404,194
• Time in Patent Office: 1,181 Days
• Field of Search: 307/31-35, 307/38-40, 364/483, 364/492, 364/493, 340/825.06-, 340/825.09, 340/825.22, 340/310 R, 340/310 A, 340/310 CP, 379/102, 379/104, 379/105
• US Class Current: 307/35
• CPC Class Codes: H02J 13/00004 characterised by the power network being locally controlled
• CPC Class Codes: H02J 13/00018 using phone lines
• CPC Class Codes: H02J 2310/14 The load or loads being home appliances
• CPC Class Codes: H02J 3/14 by switching loads on to, or off from, network, e.g. progressively balanced loading
• 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: Y02B 90/20 Smart grids as enabling technology in buildings sector smart grids supporting the management or operation of end-user stationary applications in general, or like technologies with no associated climate change mitigation effect Y04S20/00
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 20/242 Home appliances
• CPC Class Codes: Y04S 20/244 the home appliances being or involving heating ventilating and air conditioning [HVAC] units
• CPC Class Codes: Y04S 40/124 using wired telecommunication networks or data transmission busses

Abstract

Electric power uses or loads in a premises are controlled or managed depending upon whether the use is for heating, hot water, heat pump, air conditioning, lights, appliances, pumps, etc., according to programs that are controlled by the electric Power Company, for the purposes of spreading power uses at the premises over a day or other time interval, to avoid peak load periods encountered by the Power Company, while still providing the normal comfort levels required by the subscriber from the various power uses. Power levels of several uses at the subscriber'"'"'s premises are sensed and the power for each use is controlled according to a program that includes a schedule of power level and/or the time of day that is inserted in the program or controlled in the program by the Power Company to accomplish the spreading. In a particular embodiment, a programmed computer unit is provided at the premises that is monitored by the Power Company via the subscribers telephone line. Changes in the computer program are inserted in the unit by the Power Company, via the telephone line; and signals within and throughout the premises for detecting and controlling power uses are transmitted to and from the unit over the premises power line.

Claims

1. An electric power control system for controlling AC line electric power usage in an electric Power Company subscriber'"'"'s premises wherein electric power is distributed to one or more loads in said premises comprising at said premises,

(a) means for limiting electric power use of at least one of said loads,

(b) means for detecting electric power use of one or more power loads in said premises and producing power load signals representative thereof,

(c) a computer device at said premises including:

(d) means for storing data representative of limits for one or more of said loads for one or more predetermined real time intervals,

(e) a computer clock producing signals representative of said predetermined real time intervals,

(f) means responsive to said stored load limit and real time interval data and said power load signals for producing control signals for said load limiting means and

(g) means for applying said control signals to said load limiting means; and

(h) means controlled by said Power Company for varying said stored load limit and real time interval data,

(i) whereby one or more of said loads is limited during one or more of said predetermined time intervals.

2. A system as in claim 1 wherein, at said premises,

(a) means are provided for detecting one or more temperatures relating to comfort in said premises and producing temperature signals representative thereof and

(b) said means for producing control signals is responsive to said temperature signals.

3. An electric power control system for controlling AC line electric power usage in an electric Power Company subscriber'"'"'s premises wherein electric power is distributed to one or more power loads in said premises comprising at said premises,

(a) means for detecting electric power use of at least one of said loads and producing power load signals,

(b) means for limiting electric power use of at least one of said loads,

(c) a power line carrier (PLC) signal transmission system including a PLC transmit modem and a PLC receive modem on said premises power distribution system,

(d) a computer device at said premises and,

(e) means for transmitting said power load signals by said PLC signal transmission system to said computer device,

(f) said computer device including:

(g) means for storing data representative of limits for one or more of said loads for one or more predetermined real time intervals,

(h) a computer clock producing signals representative of said predetermined real time intervals,

(i) means responsive to said stored load limit and real time interval data and said power load signals for producing control signals for said load limiting means and

(j) means for applying said control signals to said load limiting means; and

(k) means controlled by said Power Company for varying said stored load limit and real time interval data,

(l) whereby one or more of said loads is limited during one or more of said predetermined time intervals.

4. An electric power control system for controlling AC line electric power usage in an electric Power Company subscriber'"'"'s premises wherein electric power is distributed to one or more loads in said premises comprising at said premises,

(a) means for limiting electric power usage of at least one of said loads,

(b) a computer device at said premises including:

(c) means for storing data representative of limits for one or more of said loads for one or more predetermined real time intervals,

(d) a computer clock producing signals representative of said predetermined real time intervals, producing control signals for said load limiting means and

(f) means for applying said control signals to said load limiting means,

(g) whereby one or more of said loads is limited during one or more of said predetermined time intervals; and

(h) means controlled by said Power Company for varying said stored load limit and real time interval data.

5. A system as in claim 4 wherein,

(a) said computer includes a microprocessor IC chip, a ROM IC chip and a RAM IC chip,

(b) said means responsive to said stored load limit and real time interval data is a program stored in said ROM and

(c) said stored load limit and real time data is stored in said RAM.

6. A system as in claim 4 wherein, at said premises,

(a) means are provided for detecting one or more temperatures relating to comfort in said premises and producing temperature signals representative thereof and

(b) said means for producing control signals is responsive to said temperature signals.

7. A system as in claim 6 wherein,

(a) said Power Company'"'"'s operation includes high load periods and low load periods,

(b) a computer program is stored in said computer device and,

(c) said load limit data, said real time interval and said computer program are such that said loads are limited to reduce said subscriber demand for AC electric power for said loads over said Power Company high load periods and spread that demand over said Power Company low load periods in view of said temperature signals relating to comfort in said premises.

8. A system as in claim 4 wherein, (a) said means controlled by said Power Company for varying said stored load limit and real time interval data includes a source of said load limit and real time interval data controlled by said Power Company and (b) means are provided for opening a telecommunication line of the public telephone system available at said subscriber'"'"'s premises and available to said Power Company between said source and said computer device at said premises for transmitting said data from said source to said computer device.

9. A system as in claim 8 wherein, (a) said means for opening a telecommunication line includes a telephone line to said premises from the public telephone system, a telephone line modem on said premises telephone line and means for coupling said modem to said computer device.

10. A system as in claim 4 wherein, (a) said means controlled by said Power Company for varying said stored load limit and real time interval data includes an input to said computer device accessible to said Power Company.

11. A system as in claim 4 wherein,

(a) said Power Company'"'"'s operation includes high load periods and low load periods,

(b) a computer program is stored in said computer device and

(c) said stored load limit and real time interval data and said computer program are such that said loads are limited to reduce said subscriber demand for AC electric power for said loads over said Power Company high load periods and spread that demand over said Power Company low load periods.

12. A system as in claim 4 wherein,

(a) said computer device includes means providing a terminal at said subscriber'"'"'s premises by which the Power Company can electrically couple digital signals representing said variable stored data to said computer device.

13. A system as in claim 4 wherein,

(a) a source of said stored load limit and real time interval data controlled by said Power Company is provided,

(b) said system has access to a public telephone line,

(c) said system includes a telephone line modem that is coupled to said public telephone line,

(d) said telephone line modem is coupled to said computer device and

(e) means are provided for initiating a telephone call between said source controlled by said Power Company and said modem,

(f) whereby signals representing said data are received by said modem from said telephone line and coupled from said modem to said computer device.

14. A system as in claim 13 wherein,

(a) a computer program is stored in said computer device,

(b) means are provided coupled to said computer device and accessible to said Power Company for electrically coupling signals representing said program to said computer device,

(c) whereby said stored load limit and real time interval data and said computer program in said computer device in said premises are controlled by said Power Company.

15. A method of controlling AC line electric power usage in an electric Power Company subscriber'"'"'s premises wherein electric power is distributed to one or more loads in the premises comprising the steps,

(a) storing data representative of limits for one or more of said loads for one or more predetermined real time intervals,

(b) varying said stored load limit and real time interval data by said electric Power Company,

(c) producing signals representative of said predetermined real time intervals and

(d) producing control signals for limiting said loads in response to said stored load limit and real time interval data and

(e) applying said control signals to to limit said loads,

(f) whereby one or more of said loads is limited during one or more of said predetermined time intervals according to said data varied by said Power Company.

16. A method as in claim 15 and including the step of,

(a) varying said stored load limit data by said Power Company via the public telephone line.

17. A method as in claim 15 and including the step of,

(a) varying said stored real time intervals by said Power Company via the public telephone line.

18. A method as in claim 15 and including the steps of,

(a) varying said stored load limit data and varying said stored real time intervals by said Power Company via the public telephone line.