Identifying devices connected to a smart plug
A smart plug may provide a smart-plug power monitoring signal that includes information about power consumption of devices connected to the smart plug. The smart-plug power monitoring signal may be used in conjunction with power monitoring signals from the electrical mains of the building for providing information about the operation of devices in the building. For example, the power monitoring signals may be used to (i) determine the main of the house that provides power to the smart plug, (ii) identify devices receiving power from the smart plug, (iii) improve the accuracy of identifying device state changes, and (iv) train mathematical models for identifying devices and device state changes.
1. A computer-implemented method for determining that a first device is connected to a smart plug, the method comprising:
establishing a network connection with the smart plug, wherein the smart plug provides power to one or more devices;
receiving a smart-plug power monitoring signal via the network connection, wherein the smart-plug power monitoring signal indicates an amount of power provided by the smart plug to the one or more devices;
obtaining a first-main power monitoring signal using measurements from a sensor that measures an electrical property of a first electrical main of a building;
identifying a smart-plug power event in the smart-plug power monitoring signal, wherein the smart-plug power event corresponds to an event time;
determining that a first-main power event in the first-main power monitoring signal corresponds to the smart-plug power event in the smart-plug power monitoring signal using the event time;
determining that the first-main power event corresponds to the first device by processing the first-main power event with a plurality of power models;
determining that the first device is connected to the smart plug using the determination that the first-main power event corresponds to the first device;
updating an entry in a data store to indicate that the first device receives power from the smart plug.
2. The computer-implemented method of claim 1 , wherein determining that the first device is connected to the smart plug comprises comparing the first-main power event to the smart-plug power event.
3. The computer-implemented method of claim 2 , wherein comparing the first-main power event to the smart-plug power event comprises comparing a power change of the first-main power event to a power change of the smart-plug power event.
4. The computer-implemented method of claim 2 , wherein comparing the first-main power event to the smart-plug power event comprises performing one or more of down sampling, translation in time, or amplitude scaling.
5. The computer-implemented method of claim 2 , wherein comparing the first-main power event to the smart-plug power event comprises:
obtaining a smart-plug portion of the smart-plug power monitoring signal corresponding to the smart-plug power event;
obtaining a first-main portion of the first-main power monitoring signal corresponding to the first-main power event;
computing a distance between the smart-plug portion and the first-main portion.
6. The computer-implemented method of claim 1 , comprising:
identifying a second first-main power event in the first-main power monitoring signal using the event time, wherein the second first-main power event corresponds to a state change of a second device; and
determining that the first-main power event corresponds to the smart-plug power event by comparing the smart-plug power event to the first-main power event and by comparing the smart-plug power event to the second first-main power event.
7. The computer-implemented method of claim 6 , wherein determining that the first-main power event corresponds to the smart-plug power event comprises using a wattage model for the first device and a wattage model for the second device.
8. The computer-implemented method of claim 1 , wherein determining that the first-main power event corresponds to the first device comprises (1) processing the first-main power event with the plurality of power models to generate a score for each power model of the plurality of power models, and (2) selecting a power model corresponding to a highest score.
9. A system for determining that a first device is connected to a smart plug, the system comprising:
at least one computer comprising at least one processor and at least one memory, the at least one computer configured to:
establish a network connection with the smart plug, wherein the smart plug provides power to one or more devices;
receive a smart-plug power monitoring signal via the network connection, wherein the smart-plug power monitoring signal indicates an amount of power provided by the smart plug to the one or more devices;
obtain a first-main power monitoring signal using measurements from a sensor that measures an electrical property of a first electrical main of a building;
identify a smart-plug power event in the smart-plug power monitoring signal, wherein the smart-plug power event corresponds to an event time;
determine that a first-main power event in the first-main power monitoring signal corresponds to the smart-plug power event in the smart-plug power monitoring signal using the event time;
determine that the first-main power event corresponds to the first device by processing the first-main power event with a plurality of power models;
determine that the first device is connected to the smart plug using the determination that the first-main power event corresponds to the first device;
update an entry in a data store to indicate that the first device receives power from the smart plug.
10. The system of claim 9 , wherein the at least one computer is configured to determine that the first device is connected to the smart plug by comparing the first-main power event to the smart-plug power event.
11. The system of claim 10 , wherein the at least one computer is configured to compare the first-main power event to the smart-plug power event by comparing a power change of the first-main power event to a power change of the smart-plug power event.
12. The system of claim 10 , wherein the at least one computer is configured to compare the first-main power event to the smart-plug power event by:
obtaining a smart-plug portion of the smart-plug power monitoring signal corresponding to the smart-plug power event;
obtaining a first-main portion of the first-main power monitoring signal corresponding to the first-main power event;
computing a distance between the smart-plug portion and the first-main portion.
13. The system of claim 9 , the at least one computer is configured to:
identify a plurality of smart-plug power events in the smart-plug power monitoring signal occurring at a plurality of event times, wherein each smart plug power event corresponds to an event time of the plurality of event times;
identify a plurality of first-main power events in the first-main power monitoring signal using the plurality of event times;
process the plurality of first-main power events with the plurality of power models to determine a device corresponding to each first-main power event;
count a number of times that the first device corresponds to a first-main power event of the plurality of first-main power events; and
wherein the at least one computer is configured to determine that the first device receives power from the smart plug by using the number of times that the first device corresponds to a first-main power event of the plurality of first-main power events.
14. The system of claim 9 , the at least one computer is configured to:
identify a second first-main power event in the first-main power monitoring signal, wherein the second first-main power event corresponds to a second time;
determine that the second first-main power event corresponds to a state change of the first device;
determine that the first device is no longer connected to the smart plug; and
update the entry in the data store to indicate that the first device does not receive power from the smart plug.
15. The system of claim 9 , wherein the at least one computer is configured to determine that the first-main power event corresponds to the first device by (1) processing the first-main power event with the plurality of power models to generate a score for each power model of the plurality of power models, and (2) selecting a power model corresponding to a highest score.
16. One or more non-transitory, computer-readable media comprising computer executable instructions that, when executed, cause at least one processor to perform actions comprising:
establishing a network connection with a smart plug, wherein the smart plug provides power to one or more devices;
receiving a smart-plug power monitoring signal via the network connection, wherein the smart-plug power monitoring signal indicates an amount of power provided by the smart plug to the one or more devices;
obtaining a first-main power monitoring signal using measurements from a sensor that measures an electrical property of a first electrical main of a building;
identifying a smart-plug power event in the smart-plug power monitoring signal, wherein the smart-plug power event corresponds to an event time;
determining that a first-main power event in the first-main power monitoring signal corresponds to the smart-plug power event in the smart-plug power monitoring signal using the event time;
determining that the first-main power event corresponds to a first device by processing the first-main power event with a plurality of power models;
determining that the first device is connected to the smart plug using the determination that the first-main power event corresponds to the first device;
updating an entry in a data store to indicate that the first device receives power from the smart plug.
17. The computer-readable media of claim 16 , wherein determining that the first device is connected to the smart plug comprises comparing the first-main power event to the smart-plug power event.
18. The computer-readable media of claim 17 , wherein comparing the first-main power event to the smart-plug power event comprises comparing a power change of the first-main power event to a power change of the smart-plug power event.
19. The computer-readable media of claim 17 , wherein comparing the first-main power event to the smart-plug power event comprises:
obtaining a smart-plug portion of the smart-plug power monitoring signal corresponding to the smart-plug power event;
obtaining a first-main portion of the first-main power monitoring signal corresponding to the first-main power event;
computing a distance between the smart-plug portion and the first-main portion.
20. The computer-readable media of claim 16 , wherein the actions comprise retrieving information from a data store indicating that the smart plug receives power from the first electrical main of the building.