System and method for controlling generation over an integrated wireless network

• US 7,184,861 B2
• Filed: 09/09/2004
• Issued: 02/27/2007
• Est. Priority Date: 08/15/2001
• Status: Expired due to Term

• Current Assignee: Landis+Gyr Inc. (Landis+Gyr Group AG)
• Original Assignee: Hunt Techonologies Incorporated (Landis+Gyr Group AG)
• Inventors: Petite, Thomas D.
• Primary Examiner(s): Picard; Leo
• Assistant Examiner(s): Kosowski; Alexander
• Application Number:
  US10/937,635
• Publication Number:
  US 20050043860A1
• Time in Patent Office: 901 Days
• Field of Search: 700/286, 700/291, 700/295, 307/11, 307/38, 307/39, 340/870.01, 340/870.02, 709/217
• US Class Current: 700/295
• CPC Class Codes: H02J 13/00002 characterised by monitoring
• 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 13/00022 using wireless data transmission
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: H02J 2310/12 The local stationary network supplying a household or a building
• CPC Class Codes: H02J 2310/70 Load identification
• CPC Class Codes: H02J 3/14 by switching loads on to, or off from, network, e.g. progressively balanced loading
• CPC Class Codes: H02J 3/38 Arrangements for parallely feeding a single network by two or more generators, converters or transformers
• CPC Class Codes: Y02A 30/60 Planning or developing urban green infrastructure
• 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 40/124 using wired telecommunication networks or data transmission busses
• CPC Class Codes: Y04S 40/126 using wireless data transmission

Abstract

An intelligent network demand control system provides a system and method for controlling demand in an energy delivery system. The intelligent network demand control system employs a transceiver network with a plurality transceivers coupled to meters and appliances residing at a plurality of customer premises. Control room operators instruct a customer premises (CP) energy management controller to implement a reduction in system demand. A demand reduction control signal is relayed out to a predefined group of transceivers to bring their respective controlled generators on line. The predefined transceivers, identified by their identification codes, are specified in the demand reduction control signal. When the transceivers bring the generators on line in response to a broadcasted demand reduction control signal, the actual demand reduction is metered and relayed back to the CP energy management controller. The total demand reduction is aggregated into a single number and then communicated to the operators.

Claims

1. A method for controlling demand in an energy delivery system, the method comprising the steps of:

generating a demand reduction control signal by an energy management controller;

transmitting the demand reduction control signal from the energy management controller to at least one of a plurality of appliance control units, each one of the plurality of appliance control units coupled to at least one generator;

starting the generator coupled to the appliance control unit in response to receiving the demand reduction control signal;

metering a first change in demand at a plurality of meters configured to detect an output from the generators;

determining a first aggregate change in demand, the first aggregate change in demand equaling a sum of the metered first change in demand at the plurality of meters; and

iteratively generating an additional demand reduction control signal and metering an actual demand reduction until the metered actual demand reduction substantially equals a specified reduction in system demand.

2. The method of claim 1, further comprising the steps of:

assigning a unique identification code to each one of the plurality of appliance control units;

selecting a plurality of identification codes such that selected ones of the plurality of appliance control units are selected; and

receiving the generated demand reduction control signal by the selected ones of the plurality of appliance control units and performing the step of starting each one of the generators coupled to the selected ones of the plurality of appliance control units.

3. The method of claim 1, further comprising the step of communicating the demand reduction control signal from the energy management controller to the at least one of a plurality of appliance control units through a communication network.

4. The method of claim 3, wherein the communication network is a public switched telephone network.

5. The method of claim 3, wherein the communication network is a utility legacy communication system.

6. The method of claim 3, wherein the communication network is a digital communication system.

7. The method of claim 3, wherein the communication network is a radio frequency (RF) communication system.

8. The method of claim 3, wherein the communication network is an Internet network.

9. The method of claim 1, further comprising the step of receiving by the energy management controller a demand reduction instruction from operators of the energy delivery system such that the step of generating the demand reduction control signal is made in response to the received demand reduction instruction.

10. The method of claim 1, further comprising the steps of:

receiving a demand reduction instruction;

determining a difference between the determined first aggregate change in demand with the demand reduction instruction;

generating a second demand reduction control signal;

transmitting the second demand reduction control signal to a second plurality of appliance control units, each one of the second plurality of appliance control units coupled to at least one generator;

starting at least one of the generators coupled to the second plurality of appliance control units in response to receiving the second demand reduction control signal;

metering a second change in demand at the plurality of meters; and

determining a second aggregate change in demand, the second aggregate change in demand equaling the sum of the metered second change in demand at the plurality of meters.

11. The method of claim 10, further comprising the step of selecting a number of appliance control units to be members of the second plurality of appliance control units such that the second aggregate change in demand substantially equals the difference between the first aggregate change in demand and the demand reduction instruction.

12. The method of claim 1, further comprising the steps of:

selecting at least one of the plurality of appliance control units; and

transmitting the generated demand reduction control signal to the selected appliance control units such that the generators coupled to the selected appliance control units are started.

13. The method of claim 1, further comprising the steps of:

generating a terminating signal; and

transmitting the terminating signal from the energy management controller to the plurality of appliance control units such that the demand reduction control signal is ended.

14. The method of claim 13, further comprising the steps of:

metering a second change in demand at each one of the plurality of meters after the demand reduction control signal is ended;

determining a second aggregate change in demand, the second aggregate change in demand equaling the sum of the metered second change in demand at each one of the plurality of meters; and

comparing the second aggregate change of demand with an aggregate metered demand determined before the demand reduction control signal is ended.

15. The method of claim 1, further comprising the steps of:

selecting a number of appliance control units to be members of a second plurality of appliance control units;

generating a second demand reduction control signal;

transmitting the second demand reduction control signal to the second plurality of appliance control units, each one of the second plurality of appliance control units coupled to at least one generator; and

starting each one of the generators coupled to the second plurality of appliance control units in response to receiving the second demand reduction control signal such that a third aggregate change in demand substantially equals a difference between the second aggregate change of demand and the aggregate metered demand determined before the demand reduction control signal is ended.

16. The method of claim 1, further comprising the steps of:

assigning a unique identification code to each one of the plurality of appliance control units;

selecting a plurality of identification codes to define a first demand reduction load block; and

associating the selected identification codes with the generated demand reduction control signal such that when the demand reduction control signal is transmitted, only the appliance control units having their identification code selected perform the step of starting at least one of the generators coupled to the appliance control unit.

17. The method of claim 16, further comprising the steps of:

defining a generation block identification code such that the generation block identification code corresponds to the selected unique identification codes; and

associating the generation block identification code with the generated demand reduction control signal such that when the demand reduction control signal is transmitted, only the appliance control units having their identification code associated with the load block identification code perform the step of starting each one of the generators coupled to the appliance control unit.

18. The method of claim 17, further comprising the steps of:

defining a plurality of generation block identification codes, each one of the generation block identification codes corresponding to the selected unique group of identification codes, such that a plurality of demand reduction generation blocks are defined;

estimating an aggregate amount of demand reduction for each of the plurality of demand reduction generation blocks;

receiving a demand reduction instruction specifying a desired aggregate demand reduction; and

selecting at least one of the plurality of demand reduction generation blocks such that the estimated amount of demand reduction for the selected demand reduction generation blocks approximately equals the desired aggregate demand reduction specified by the demand reduction control signal.

19. The method of claim 18, further comprising the steps of:

metering an aggregate change in demand after the demand reduction control signal is transmitted to the plurality of appliance control units;

determining a difference between the aggregate metered change in demand and the specified desired aggregate demand reduction;

selecting at least one second demand reduction generation block such that the sum of the estimated aggregate amount of demand reduction associated with the selected second demand reduction load block substantially equals the determined difference; and

generating a second demand reduction control signal such that when the second demand reduction control signal is transmitted, only the appliance control units having their identification code associated with the second demand reduction generation block perform the step of starting each one of the generators coupled to the appliance control unit.

20. The method of claim 1, further comprising the step of transmitting to the energy management controller an acknowledgment signal from each one of the appliance control units that successfully started its respective generator.

21. The method of claim 1, further comprising the steps of:

generating a notification control signal by the energy management controller, the generation of the notification control signal occurring before the step of generating the demand reduction control signal by a predefined amount of time;

transmitting the notification control signal from the energy management controller to at least one of the plurality of appliance control units;

receiving the notification control signal by the at least one appliance control unit; and

generating a notification communication signal by the at least one appliance control unit such that a customer understands that the step of starting the generator will occur at a future time, the future time substantially corresponding to the predefined amount of time.

22. A system for controlling demand in an energy delivery system, comprising:

means for generating a demand reduction control signal by an energy management controller;

means for transmitting the demand reduction control signal from the energy management controller to at least one of a plurality of appliance control units, each one of the plurality of appliance control units coupled to at least one generator;

means for generating an on-line control signal in response to receiving the demand reduction control signal;

means for starting the generator coupled to the appliance control unit in response to receiving the on-line control signal;

means for metering a first change in an output of the generators;

means for determining a first aggregate change in demand, the first aggregate change in demand equaling a sum of the metered first change in output of the plurality of generators; and

means for iteratively generating an additional demand reduction control signal and metering an actual demand reduction until the metered actual demand reduction substantially equals a specified reduction in system demand.

23. The system of claim 22, further comprising:

means for assigning a unique identification code to each one of the plurality of appliance control units; and

means for selecting a plurality of identification codes such that selected ones of the plurality of appliance control units are selected.

24. The system of claim 22, further comprising means for communicating the demand reduction control signal from the energy management controller to the at least one of a plurality of appliance control units through a communication network.

25. The system of claim 22, further comprising means for receiving by the energy management controller a demand reduction instruction from operators of an energy delivery system such that the step of generating the demand reduction control signal is made in response to the received demand reduction instruction.

26. The system of claim 22, further comprising:

means for receiving a demand reduction instruction, the demand reduction instruction having at least a requested amount of demand reduction;

means for determining a difference between the determined first aggregate change in demand with the requested amount of demand reduction;

means for generating a second demand reduction control signal;

means for transmitting the second demand reduction control signal to a second plurality of appliance control units, each one of the second plurality of appliance control units coupled to at least one generator;

means for starting at least one of the generators coupled to the second plurality of appliance control units in response to receiving the second demand reduction control signal;

means for metering a second change in demand corresponding to the output of the generators; and

means for determining a second aggregate change in demand, the second aggregate change in demand equaling the sum of the metered second change in demand.

27. The system of claim 26, further comprising means for selecting a number of appliance control units to be members of the second plurality of appliance control units such that the second aggregate change in demand substantially equals the difference between the first aggregate change in demand and the demand reduction instruction selecting the number of appliance control units to be members of the second plurality of appliance control units such that the second aggregate change in demand substantially equals the difference between the first aggregate change in demand and the requested amount of demand reduction.

28. The system of claim 22, further comprising:

means for selecting at least one of the plurality of appliance control units; and

means for transmitting the generated demand reduction control signal to the selected appliance control units such that the generators coupled to the selected appliance control units are started.

29. The system of claim 22, further comprising:

means for generating a terminating signal; and

means for transmitting the terminating signal from the energy management controller to the plurality of appliance control units such that the on-line control signal is ended.

30. The system of claim 22, further comprising:

means for assigning a unique identification code to each one of the plurality of appliance control units;

means for selecting a plurality of identification codes to define a first generation block; and

means for associating the selected identification codes with the generated demand reduction control signal such that when the demand reduction control signal is transmitted, only the appliance control units having their identification code selected perform the step of starting at least one of the generators coupled to the appliance control unit.

31. The system of claim 30, further comprising:

means for defining a generation identification code such that the generation block identification code corresponds to the selected unique identification codes; and

means for associating the generation block identification code with the generated demand reduction control signal such that when the demand reduction control signal is transmitted, only the appliance control units having their identification code associated with the generation block identification code perform the step of starting each one of the generators coupled to the appliance control unit.

32. The system of claim 31, further comprising:

means for defining a plurality of generation block identification codes, each one of the generation block identification codes corresponding to the selected unique group of identification codes, such that a plurality of generation load blocks are defined;

means for estimating an aggregate amount of demand reduction for each of the plurality of generation load blocks;

means for receiving a demand reduction instruction specifying a desired aggregate demand reduction; and

means for selecting at least one of the plurality of generation load blocks such that the estimated aggregate amount of demand reduction for the selected generation load blocks approximately equals the desired aggregate demand reduction specified by the demand reduction control signal.

33. The system of claim 32, further comprising:

means for metering an aggregate change in demand after the demand reduction control signal is transmitted to the plurality of appliance control units;

means for determining a difference between the aggregate metered change in demand and the specified desired aggregate demand reduction;

means for selecting at least one second generation load block such that the sum of the estimated aggregate amount of demand reduction associated with the selected second generation load block substantially equals the determined difference; and

means for generating a second demand reduction control signal such that when the second demand reduction control signal is transmitted, only the appliance control units having their identification code associated with the second generation load block perform the step of starting each one of the generators coupled to the appliance control unit.

34. The system of claim 22, further comprising means for transmitting to the energy management controller an acknowledgment signal from each one of the appliance control units that successfully started its respective generator.

35. A computer-readable medium having a program for controlling demand in an energy delivery system, the program comprising logic configured to perform the steps of:

generating a demand reduction control signal by an energy management controller so that the demand reduction control signal is transmitted from the energy management controller to at least one of a plurality of appliance control units, each one of the plurality of appliance control units coupled to at least one generator and configured to start the generator coupled to the appliance control unit in response to receiving the demand reduction control signal, and so that a first metered change in demand is received from a plurality of meters, each one of the meters coupled to the generator;

determining a first aggregate change in demand, the first aggregate change in demand equaling a sum of the metered first change in demand at the plurality of meters; and

iteratively generating an additional demand reduction control signal and metering an actual demand reduction until the metered actual demand reduction substantially equals a specified reduction in system demand.

36. The computer-readable medium of claim 35, the program further comprising logic configured to perform the steps of receiving a demand reduction instruction from operators of the energy delivery system such that the step of generating the demand reduction control signal is made in response to the received demand reduction instruction.

37. The computer readable medium of claim 35, the program further comprising logic configured to perform the steps of:

determining a difference between the determined first aggregate change in demand with a requested amount of demand reduction;

generating a second demand reduction control signal so that the second demand reduction control signal is transmitted to a second plurality of appliance control units, each one of the second plurality of appliance control units coupled to at least one generator so that the generators coupled to the second plurality of appliance control units are started in response to receiving the second demand reduction control signal, and so that a second metered change in demand is received from a plurality of second meters, each one of the second meters coupled to started generators; and

determining a second aggregate change in demand, the second aggregate change in demand equaling the sum of the metered second change in demand at the plurality of second meters.

38. The computer-readable medium of claim 37, the program further comprising logic configured to perform the steps of selecting a number of appliance control units to be members of the second plurality of appliance control units such that the second aggregate change in demand substantially equals the difference between the first aggregate change in demand and the requested amount of demand reduction.

39. The computer-readable medium of claim 35, the program further comprising logic configured to perform the steps of:

assigning a unique identification code to each one of the plurality of appliance control units;

selecting a plurality of identification codes to define a first generation load block; and

associating the selected identification codes with the generated demand reduction control signal such that when the demand reduction control signal is transmitted, only the appliance control units having their identification code selected start the generator coupled to the appliance control unit.

40. The computer-readable medium of claim 39, the program further comprising logic configured to perform the steps of:

defining a generation block identification code such that the generation block identification code corresponds to the selected unique identification codes; and

associating the generation block identification code with the generated demand reduction control signal such that when the demand reduction control signal is transmitted, only the appliance control units having their identification code associated with the generation block identification code start the generator coupled to the appliance control unit.

41. The computer-readable medium of claim 40, the program further comprising logic configured to perform the steps of:

defining a plurality of generation block identification codes, each one of the generation block identification codes corresponding to the selected unique group of identification codes, such that a plurality of demand reduction generation blocks are defined;

estimating an aggregate amount of demand reduction for each of the plurality of generation load blocks; and

selecting at least one of the plurality of generation blocks such that an estimated amount of demand reduction for the selected demand reduction generation blocks approximately equals a desired aggregate demand reduction specified by the demand reduction control signal.