Method of communicating a command for load shedding of a load control system

• US 8,031,049 B2
• Filed: 05/19/2010
• Issued: 10/04/2011
• Est. Priority Date: 11/13/2006
• Status: Active Grant

• Current Assignee: Lutron Technology Company LLC
• Original Assignee: Lutron Electronics Company Incorporated (Lutron Electronics)
• Inventors: Murdoch, John Bruce
• Primary Examiner(s): PATEL, RAMESH B
• Application Number:
  US12/783,132
• Publication Number:
  US 20100225452A1
• Time in Patent Office: 503 Days
• Field of Search: 340 736- 737, 340/539.3, 340/693.1, 340/693.3, 700286-287, 700/291, 700295-297, 709/203
• US Class Current: 340/7.36
• CPC Class Codes: H02J 3/00 Circuit arrangements for ac mains or ac distribution networks
• CPC Class Codes: H05B 47/185 via power line carrier transmission

Abstract

The present invention provides a means for secure communication between an electrical utility company and an electricity customer, such that the customer is able to shed one or more loads in response to a load shed command from the utility company. A system server of the customer periodically connects to a utility server of the utility company using a standard computer protocol, such as Hypertext Transfer Protocol (HTTP). The system server sends a request message via the Internet to the utility server. The request message provides data on the total possible load, the present power consumption, and the present load shed state of the electricity customer. The utility server receives the request message and responds to the request message by transmitting to the system server a response message, which includes a load shed command.

Claims

1. A method of communicating a command for controlling a plurality of electrical loads, the method comprising the steps of:

transmitting a command request message;

receiving a response message in response to the command request message, the response message including the command; and

controlling the plurality of electrical loads in response to the command of the response message.

2. The method of claim 1, wherein the command request message comprises a total amount of power presently being consumed by the plurality of electrical loads.

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

determining a present amount of power being consumed by each of the plurality of electrical loads; and

determining the total amount of power presently being consumed by the plurality of electrical loads in response to the step of determining a present amount of power being consumed by each of the plurality of electrical loads.

4. The method of claim 3, wherein the step of determining the total amount of power presently being consumed by all of the plurality of electrical loads further comprises summing the present amounts of power being consumed by the plurality of electrical loads.

5. The method of claim 3, wherein the step of determining a present amount of power being consumed by each of the plurality of electrical loads further comprises estimating the present amount of power being consumed by each of the plurality of electrical loads.

6. The method of claim 3, wherein the step of determining a present amount of power being consumed by each of the plurality of electrical loads further comprises measuring the present amount of power being consumed by each of the plurality of electrical loads.

7. The method of claim 2, wherein the command of the response message comprises a load shed command.

8. The method of claim 7, further comprising the step of:

determining the load shed command in response to the total amount of power presently being consumed by the plurality of electrical loads of the command request message.

9. A computer-readable medium having stored thereon computer-executable instructions for performing a method of communicating a command to control a plurality of electrical loads, the method comprising the steps of:

transmitting a command request message;

receiving a response message in response to the command request message, the response message including the command; and

controlling the plurality of electrical loads in response to the command of the response message.