Automated demand response scheduling to reduce electrical loads

• US 9,310,786 B2
• Filed: 06/17/2011
• Issued: 04/12/2016
• Est. Priority Date: 06/17/2011
• Status: Active Grant

• Current Assignee: Siemens Industry Incorporated (Siemens AG)
• Original Assignee: Siemens Industry Incorporated (Siemens AG)
• Inventors: Imhof, Raphael, Songkakul, Pornsak, Marchi, Michael J., Rule, Thomas, Hiller, Paula, Ersch, Florian
• Primary Examiner(s): Ali, Mohammad
• Assistant Examiner(s): Booker, Kelvin
• Application Number:
  US13/163,143
• Publication Number:
  US 20120323393A1
• Time in Patent Office: 1,761 Days
• Field of Search: 700/297
• US Class Current: 1/1
• CPC Class Codes: G05B 15/02 electric
• CPC Class Codes: G05B 2219/2642 Domotique, domestic, home control, automation, smart house
• CPC Class Codes: H02J 3/00 Circuit arrangements for ac mains or ac distribution networks

Abstract

A system and method for reducing an electrical load in a facility with a building automation system, includes first receiving information for a demand response event from an automated demand response server at an automated demand response client. After receipt of a new demand response event, the system determines a plurality of devices of the building automation system to be controlled during the demand response event. Next, the system prepares a schedule of control actions for the plurality of devices during the demand response event. The system then sends control messages to the building automation system to execute the control actions for the plurality of devices according to the schedule of control actions for the demand response event.

Claims

1. A method of reducing an electrical load in a facility with a building automation system, the method comprising:

receiving a demand response message related to a demand response event via a computer connected to a network, the demand response message identifying at least one demand response mode for the demand response event;

determining at least one device of the building automation system to be controlled during the demand response event based on an association between the at least one device and the at least one demand response mode for the demand response event;

responsive to receiving the demand response message, automatically generating a schedule of a plurality of control actions for the at least one device for execution in association with the demand response event, wherein the schedule of control actions is generated based at least in part on a demand response control period associated with the plurality of the control actions;

determining whether at least one schedule conflict exists for a first control action and a second control action from the schedule of control actions, wherein execution of the first control action would cause the at least one device to operate differently than the second control action during the associated demand response control period; and

sending control messages to the building automation system to execute the control actions for the at least one device according to the schedule of control actions for the demand response event.

2. The method of claim 1 further comprising determining whether the at least one schedule conflict exists prior to sending the control message.

3. The method of claim 2 wherein determining whether at least one schedule conflict exists occurs during the generation of the schedule of control actions, wherein generating the schedule of control actions includes preparing a preliminary schedule, determining whether at least one schedule conflict exists in the preliminary schedule, and resolving the at least one schedule conflict based on a priority execution order associated with each of the first control action and the second control actions.

4. The method of claim 1 wherein the control actions in the schedule are associated with a plurality of demand response control periods, wherein the plurality of demand response control periods include a first demand response control period occurring before the at least one demand response mode, a second demand response control period occurring during the at least one demand response mode, and a third demand response control period occurring after the at least one demand response mode.

5. The method of claim 4 wherein the plurality of demand response control periods include a fourth demand response period occurring before the demand response event and a fifth demand response control period occurring after the demand response event.

6. The method of claim 1, wherein the at least one demand response mode includes a first demand response mode and a second demand response mode each specified in the demand response message and associated with a respective start and end time, the at least one device is a single device, the method further comprising:

prior to receiving the demand response message, associating the single device with a first of the control actions predefined to occur during a first control period starting after the end of the first demand response mode and with a second of the control actions predefined to occur during a second control period starting before the start of the second demand response mode; and

after receiving the demand response message, determining that the first control action conflicts with the second control action based on the first control period overlapping with the second control period.

7. The method of claim 6, further comprising:

prior to receiving the demand response message, associating each demand response mode with a plurality of time references, each combination of demand response mode and associated time reference being indicative of one of a plurality of demand response control periods, the first and second control periods each being one of the demand response control periods;

assigning a respective priority to each combination of demand response mode and associated time reference; and

resolving the conflict between the first control action and the second control action based on the priority assigned to the combination of the first demand response mode and the associated time reference that is indicative of the first control period, and the priority assigned to the combination of the second demand response mode and the associated time reference that is indicative of the second control period.

8. The method of claim 1 wherein the demand response message is received from a demand response automated server at an automated demand response client associated with the building automation system.

9. The method of claim 8 wherein the at least one device includes a plurality of devices, and wherein the automated demand response client is configured to determine the plurality of devices of the building automation system to be controlled during the demand response event, prepare the schedule of control actions, and send control messages to the building automation system to execute the control actions.

10. The method of claim 9 further comprising, before the step of generating a schedule, determining that the automated demand response client has been configured to operate under a second of at least two operation options before preparing the schedule of control actions, wherein a first of the at least two operation options does not include preparation of the schedule and a second of the at least two operation options does include preparation of the schedule.

11. The method of claim 1 further comprising displaying information related to the actual energy consumption of the facility during the demand response event on a graphical user interface.

12. The method of claim 1 further comprising displaying on a graphical user interface a graph showing demand response events and a plurality of demand response modes associated with the demand response events during a selected period of time.

13. The method of claim 12 wherein the graph shows the demand response events and demand response modes as a step function graph, and wherein graph is color coded in association with the plurality of demand response modes.

14. A system for reducing the electrical load in a building, the system comprising:

a building automation system (BAS) including a plurality of field panels configured to deliver control instructions to a plurality of devices in the building;

an automated demand response client configured to receive a message concerning a demand response event from an automated demand response server, the message including information concerning at least one demand response mode for the demand response event, the automated demand response client including;

a scheduler component configured to generate a schedule of control actions for at least one device of the plurality of devices during the demand response event, wherein generation of the schedule of control actions is based at least in part on a demand response control period associated with each of the control actions, of the schedule, and a BAS communications component configured to deliver the control actions of the schedule for the at least one device to the plurality of BAS field panels according to the schedule; and

wherein each demand response control period is associated with the demand response event or the at least one demand response mode, and wherein the scheduler is further configured to review the schedule of control actions to determine if a conflict exists in the control actions of the schedule.

15. The method of claim 14 wherein the automated demand response client is configured to:

prior to receiving the demand response message, associate each demand response mode with a plurality of time references, each combination of demand response mode and associated time reference being indicative of one of a plurality of demand response control periods, the first and second control periods each being one of the demand response control periods;

assign a respective priority to each combination of demand response mode and associated time reference; and

resolve the conflict between the first control action and the second control action based on the priority assigned to the combination of the first demand response mode and the associated time reference that is indicative of the first control period, and the priority assigned to the combination of the second demand response mode and the associated time reference that is indicative of the second control period.

16. The system of claim 14 wherein, if the conflict exists in the schedule, the scheduler is configured to resolve the conflict based on a priority execution order for the control action, wherein the priority execution order is related to the demand response control period for the control action.

17. The system of claim 16 wherein the demand response control period for at least a first control action is a demand response control period occurring during the demand response event, the demand response control period for at least a second control action is a demand response control period occurring before the demand response event, and the demand response control period for at least a third control action is a demand response control period occurring after the demand response event.

18. The system of claim 14 wherein:

the at least one demand response mode includes a first demand response mode and a second demand response mode each specified in the demand response message and associated with a respective start and end time;

the at least one device is a single device;

prior to receiving the demand response message, the automated demand response client is configured to associate the single device with a first of the control actions predefined to occur during a first control period starting after the end of the first demand response mode and with a second of the control actions predefined to occur during a second control period starting before the start of the second demand response mode; and

after receiving the demand response message, the automated demand response client is configured to determine that the first control action conflicts with the second control action based on the first control period overlapping with the second control period.

19. A computer-readable medium containing instructions which when executed on a computer generates instructions for controlling a building automation system including a plurality of devices, by:

receiving a message for a demand response event from an automated demand response server, the message including information concerning at least one demand response mode for the demand response event;

responsive to receiving the demand response message, automatically generating a schedule of control actions for the at least one device of the plurality of the building automation system for execution in association with the demand response event, wherein the schedule of control actions is generated based at least in part on a demand response control period associated with each of the control actions;

determining whether at least one schedule conflict exists for a first control action and a second control action from the schedule of control actions, wherein execution of the first control action would cause the at least one device to operate differently than the second control action during the associated demand response control period; and

sending control messages to the building automation system to execute the control actions for the at least one device according to the schedule of control actions for the demand response event.