Engery management and building automation system

• US 5,572,438 A
• Filed: 01/05/1995
• Issued: 11/05/1996
• Est. Priority Date: 01/05/1995
• Status: Expired due to Term

• Current Assignee: Elutions, Inc.
• Original Assignee: Teco Energy Management Services
• Inventors: Ehlers, Gregory A., Howerton, Robert D., Speegle, Gary E.
• Primary Examiner(s): Voeltz, Emanuel T.
• Assistant Examiner(s): Choi, Kyle J.
• Application Number:
  US08/369,679
• Time in Patent Office: 670 Days
• Field of Search: 364/492, 364/493, 364/464.04, 364/132, 364/138, 364/139, 307/38, 307/39, 307/41, 307/115, 307/116, 307/126, 307/132 E
• US Class Current: 700/295
• CPC Class Codes: G01R 21/133 by using digital technique
• CPC Class Codes: G01R 22/00 Arrangements for measuring time integral of electric power or current, e.g. electricity meters
• CPC Class Codes: G05B 2219/2642 Domotique, domestic, home control, automation, smart house
• CPC Class Codes: H02J 13/00004 characterised by the power network being locally controlled
• CPC Class Codes: H02J 13/00017 using optical fiber
• CPC Class Codes: H02J 13/00028 involving the use of Internet protocols
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: H02J 2310/14 The load or loads being home appliances
• CPC Class Codes: H02J 2310/64 The condition being economic, e.g. tariff based load management
• 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 20/00 Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
• 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 40/124 using wired telecommunication networks or data transmission busses
• CPC Class Codes: Y04S 50/10 Energy trading, including energy flowing from end-user application to grid

Abstract

An energy management and building automation system including a local area network or home automation data bus such as the CEBus. Each load is connected to the bus via a control module which may contain a circuit breaker to disconnect the load from the mains upon command or upon occurrence of a power outage. Current monitoring control modules measure load current and power monitor modules monitor power consumed by selected loads, both modules transmitting bus messages indicating load status and status changes. A first microcomputer preferably is external to the customer premises, adjacent the electric utility power meter. A second microcomputer preferably is inside the customer premises. The two microcomputers communicate with each other and with the various modules via the network/data bus. The first microcomputer communicates with the utility company via any appropriate communications link. The second microcomputer serves, in part, as an input/output terminal for the system, allowing the customer to set parameters and query the system as to power usage, displaying reports requested by the customer and messages transmitted by the utility company and by either microcomputer. The first microcomputer acts as a master controller and/or network server, communicating with the world outside the premises, as a communications gateway between voice, video and data services, and being the primary data collector and operator of load control modules; the second microcomputer provides certain backup functions. The utility company can access selected utilization data and control at least some loads via messages to the first microcomputer.

Claims

1. A first microcomputer for use in conjunction with a second microcomputer to control the operation of a plurality of electrical loads in a customer premises, comprising:

a first processor unit;

a first memory unit;

means for receiving from the second microcomputer commands to schedule events concerning the operation of loads;

means operable in cooperation with the first processor unit for collecting and storing in the first memory data describing historical power or energy usage by the customer; and

means operable under control of the first processor unit for transmitting to load control modules message to effectuate said scheduled events.

2. The first microcomputer of claim 1 further including:

means for receiving, over a communications link, messages containing requests for implementing load shedding operations at the customer premises; and

means operable under control of the first processor unit for transmitting to load control modules messages to effectuate said load shedding operations.

3. The first microcomputer of claim 1 further including means for reading a watt-hour meter which meters the consumption of energy at the premises, the historical data including data obtained by reading the watt-hour meter.

4. The first microcomputer of any of claims 1, 3 and 2 further including energy monitor means for monitoring and measuring the consumption of energy by at least one load.

5. The first microcomputer of claim 3 wherein the energy monitor means is adapted to monitor and measure the consumption of energy by up to four loads.

6. The first microcomputer of any of claims 1, 3 and 2 further including, in the first memory, a data structure;

and the first microcomputer executing operations to store in the data structure on a periodic basis the energy consumption measurement for each said load.

7. The first microcomputer of claim 6 further including means for transmitting to at beast one of the second microcomputer and a remote site, via the communications link, data comprising at least one of watt-hour meter readings and energy consumption by a load device.

8. The first microcomputer of claim 7 wherein the data comprises, as a function of time interval, said at least one watt-hour meter reading and said energy consumption by a load device.

9. For use with a master controller, a secondary controller for reporting the operation of a plurality of electrical loads in a customer premises, comprising:

means for communicating with the master controller;

means for displaying messages to the customer;

means for obtaining from the master controller historical energy consumption data for one or more loads; and

means for generating, in response to a request, on the means for displaying, a report describing said historical energy consumption data.

10. A secondary controller according to claim 9, wherein the means for generating creates on the means for displaying a graphical indication of the rate at which energy is being consumed at the premises.

11. A secondary controller according to claim 9, wherein the means for generating further creates on the means for displaying a graphical indication of the rate at which a selected load device has been consuming energy.

12. A system for controlling the operation of an electrical load to connect said load to and disconnect said load from electrical mains under specified conditions, comprising:

a. a first microcomputer including a first processor and first memory connected to intercommunicate and a first control program to control the execution of operations by the first microcomputer;

b. a second microcomputer including a second processor and second memory connected to intercommunicate, user means for a user to provide input data and a second control program to control the execution of operations by the second microcomputer;

c. at least one load control module which controls the condition of the load responsive to instructions from the first microcomputer, including at least instructions to connect the load to electrical mains and to disconnect the load from electrical mains;

d. a communications channel;

e. the first and second microcomputers and the load control module all being adapted to intercommunicate via the communications channel whereby the first microcomputer sends instructions to the load control module via the communications channel;

f. responsive to input data provided to the second microcomputer by the user, the first computer program causing the first microcomputer to execute instructions which build in the first memory a database including for at least specified loads a user-supplied maximum rate the user is willing to pay for energy to operate the load;

g. means for receiving from a energy provider an energy rate charge for operation of the load; and

h. the first microcomputer executing instructions in the first computer program to obtain from the database said user-supplied maximum rate, to compare said maximum rate to the rate charge received from the electrical energy provider, and to send to the load control module instructions to disconnect the load from the electrical mains if and when the received rate exceeds the maximum rate.

13. A method for supplying information about usage, at the premises of a customer, of electrical energy supplied from an external source, comprising the steps of:

a. metering electrical energy used at the premises to produce an energy consumption meter reading;

b. at intervals, storing in a memory the meter reading;

c. at intervals, measuring electrical power consumption by each of a plurality of load devices at the premises;

d. storing in said memory, in association with the each said load device the electrical power consumption measurements therefor;

e. associating in said memory, for each load device, information identifying the load device; and

f. providing reports detailing, as a function of time, the electrical energy consumed by each said load device and by the premises as a whole.

14. The method of claim 13 further including the step of storing, in said memory, in association with different classes of load devices, as a function of time, a rate associated with each of said classes of devices.

15. A first microcomputer for use in conjunction with a second microcomputer to control the operation of a plurality of electrical loads in a customer premises, the second microcomputer being located at the customer premises and the first microcomputer being locatable in the vicinity of the customer premises and being locatable independently of the second microcomputer, comprising:

means for receiving, from a communications link carrying messages from a source other than the second microcomputer, messages contain requests for implementing load shedding operations at the customer premises;

means for receiving from the second microcomputer commands to establish user-determined criteria concerning the operation of loads;

means for transmitting to load control modules messages to effectuate said load shedding operations only if the established user-determined criteria are satisfied; and

means for collecting and storing data describing historical power or energy usage by the customer.

16. The first microcomputer of claim 15 further including means for reading a Watt-hour meter which meters the consumption of an energy at the premises.

17. The first microcomputer of either of claims 2 and 15 wherein a message containing a request for implementing a toad shedding operation may include a request to shed a load of a predetermined type and the means operable under control of the first processor unit for transmitting to load control modules messages to effectuate load shedding operations responsively transmits a load shedding message only to load control modules for loads of the predetermined type,

18. The first microcomputer of either of claims 2 and 15 wherein the user-determined criteria includes an energy price limit associated with a load, the means for receiving messages is adapted to receive information defining an energy price at which load shedding is no longer required and the first processor unit transmits to a load control module a message to effectuate shedding of an associated load only if the user-determined energy price limit exceeds the energy price.

19. A system for controlling the operation of an electrical load at a premises to connect said load to and disconnect said load from electrical mains at determined times, comprising:

a. a first microcomputer adapted to be sited in the vicinity of the premises, including a first processor and first memory connected to intercommunicate and a first control program to control the execution of operations by the first microcomputer;

b. a second microcomputer for siting in the vicinity of the premises, including a second processor and second memory connected to intercommunicate, user means for a user to provide input data and a second control program to control the execution of operations by the second microcomputer;

c. at least one load control module which controls the condition of the load responsive to instructions from the first microcomputer, including at least instructions to connect the load to electrical mains and to disconnect the load from electrical mains;

d. a communications channel;

e. the first and second microcomputers and the load control module all being adapted to intercommunicate via the communications channel whereby the first microcomputer sends instructions to the load control module via the communications channel;

f. responsive to input data provided to the second microcomputer by the user, the first computer program causing the first microcomputer to execute instructions which build in the first memory a database of at least one of power and energy-price criteria associated with loads; and

g. the first microcomputer executing instructions in the first computer program to obtain from the database said power and energy-price criteria and executing corresponding instructions to evaluate the criteria and send to the load control module instructions to connect the load to or disconnect the load from the mains when the criteria are satisfied.

20. A system for metering and controlling the operation of an electrical load at a premises to connect said load to and disconnect said load from electrical mains at determined times and to meter energy usage by said load, comprising:

a. a first microcomputer adapted to be sited in the vicinity of the premises, including a first processor and first memory connected to intercommunicate and a first control program to control the execution of operations by the first microcomputer;

b. a second microcomputer for siting in the vicinity of the premises, including a second processor and second memory connected to intercommunicate, user means for a user to provide input data and a second control program to control the execution of operations by the second microcomputer;

c. at least one load control module which controls the condition of the load responsive to instructions from the first microcomputer, including at least instructions to connect the load to electrical mains and to disconnect the load from electrical mains;

d. a communications channel;

e. the first and second microcomputers and the load control module all being adapted to intercommunicate via the communications channel whereby the first microcomputer sends instructions to the load control module via the communications channel;

f. responsive to input data provided to the second microcomputer by the user, the first computer program causing the first microcomputer to execute instructions which build in the first memory a database of load events to occur at predetermined times;

g. the first microcomputer executing instructions in the first computer program to obtain from the database said load events at said predetermined times and executing corresponding instructions to send to the load control module instructions to connect the load to or disconnect the load from electrical mains;

h. the second microcomputer including a database of load events to occur at predetermined times;

i. an electrical energy consumption metering subsystem for metering, during successive determined intervals, the electrical energy consumed by the loads connected to the mains and for supplying a value for the energy metered, wherein the first microcomputer is operated to obtain from the metering subsystem and store in the database of the first microcomputer said metered values, indexed according to the succession of intervals; and

wherein

the second microcomputer is operated from time to time, when it is turned on, to transmit to the first microcomputer a request for a predetermined number of said metered values;

the first microcomputer is operated, in response to receiving said request, to transmit to the second microcomputer any of said predetermined number of metered values not previously sent to the second microcomputer; and

the second microcomputer, in response to receiving said metered values, modifies its database by adding thereto corresponding entries.

21. The system of claim 20 wherein at least one load control module is of a type which measures an electrical usage parameter of a corresponding load and the first microcomputer is adapted to receive from said load control module, via the communications channel, a message containing said measurement and the first microcomputer is operated to store in the first database said measurement in such a way as to associate said measurement with the corresponding load.

22. The system of claim 21 wherein the second microcomputer is operable to request from the first microcomputer said measurement;

the first microcomputer operates in response to said request by transmitting to the second microcomputer said measurement and the second microcomputer then stores said measurement in the second database, in association with the corresponding load.

23. The system of claim 21 wherein the first microcomputer has memory capacity to store a first predetermined number of days'"'"' metered values and a first predetermined number of load measurements, the second microcomputer has memory capacity to store a second predetermined number of days'"'"' metered values and a second predetermined number of load measurements, and further wherein the first and second computer programs execute interactively on the first and second microcomputers, respectively, when the second microcomputer becomes active after having been inactive, to transfer those metered values and load measurements to synchronize the contents of the database of metered values and load measurements in the second microcomputer with the database of metered values and load measurements in the first microcomputer.

24. The system of claim 23 wherein the first and second programs execute interactively to synchronize the contents of the databases after power has been shut off to the second microcomputer for some period of time.

25. The system of claim 23 wherein the first and second programs execute interactively to synchronize the contents of the databases after power is turned on for the second microcomputer for the first time.

26. The system of claim 23 wherein the database in the second microcomputer has a larger capacity for storing more metered values or more load measurements than the database in the first microcomputer.

27. The system of claim 20 wherein at least one load control module is adapted to measure the voltage across a corresponding controlled load, a current through the load and a phase angle of said current with respect to said voltage.

28. The system of claim 27 further including means for computing the energy consumption of the controlled load and the power factor for the load.

29. The system of claim 28 wherein the means for computing is located at the load control module.