DETECTION AND DISAGGREGATION OF ELECTRICAL VEHICLE CHARGING
A system and method for disaggregation of customer electrical usage to detect an electrical vehicle (EV) charger from among other electrical devices. An example electricity meter includes a processor, memory device(s), and applications including a model for detecting EV charging. An example model: associates data from a time-series of paired voltage and current measurements with a moving time-window including a plurality of sub-windows having a cumulative duration of the moving time-window; adds a new sub-window having at least one new paired voltage and current measurement to the moving time-window, and deletes an old sub-window, in a continuing manner; determines a value of power, and a value of volt-amps-reactive, for each sub-window within the moving time-window, wherein a stream of paired P and Q values is created; and determines, based on the stream of paired P and Q values, if an EV was charged and estimates the amount of EV charging power or energy.
1 . An electricity meter, comprising:
a processor;
one or more memory devices in communication with the processor;
a metrology device in communication with the processor and configured to create a time-series of paired voltage and current measurements; and
a model configured to detect electric vehicle (EV) charging, wherein the model is defined in the one or more memory devices and performs actions comprising:
associating data from the time-series of paired voltage and current measurements with a moving time-window, wherein the moving time-window comprises a plurality of sub-windows having a cumulative duration of the moving time-window;
adding a new sub-window having at least one new paired voltage and current measurement to the moving time-window, and deleting an old sub-window having at least one paired voltage and current measurement from the moving time-window, in a continuing manner;
determining a value of power, P, and a value of volt-amps-reactive (VAR), Q, for each sub-window within the moving time-window, wherein a stream of paired P and Q values is created; and
disaggregating a load measured by the metrology device, based at least in part on the stream of paired P and Q values, to determine if an EV was charged.
2 . The electricity meter of claim 1 , wherein the actions additionally comprise:
calculating a mean value, a median value, a standard deviation, and at least one additional quantile of the value of P and the value of Q from each of the sub-windows;
wherein the determining if the EV was charged is based in part on the median value, the standard deviation, and the at least one additional quantile of the value of P and the value of Q from each of the sub-windows.
3 . The electricity meter of claim 1 , additionally comprising:
a pre-processing application, wherein the pre-processing application is defined in the one or more memory devices and receives the time-series of paired voltage and current measurements from the metrology device; and
a post-processing application, wherein the post-processing application is defined in the one or more memory devices and receives EV charging data from the model.
4 . The electricity meter of claim 1 , wherein the actions additionally comprise:
sending data to a remote computing device for a second post-processing, wherein the second post-processing infers and summarizes EV charging activity and provides data to a user interface that displays information indicating the EV charging activity.
5 . The electricity meter of claim 1 , wherein the model is a stacked model, and wherein the stacked model comprises:
a set of tree-based algorithms trained on data streams by a method of cross-validation, wherein the data streams comprise data based on mean, median, standard deviation and at least one other quantile of P and Q in multiple windows, and wherein the stacked model is configured for receiving mean, median, standard deviation, and the at least one other quantile of P and Q in the multiple windows.
6 . The electricity meter of claim 1 , wherein the actions additionally comprise:
disaggregating electricity use more frequently than once per hour; and
wherein the determining if the EV was charged is performed more frequently than once per day and is based in part on the disaggregating of electricity use.
7 . The electricity meter of claim 1 , wherein the actions additionally comprise:
disaggregating electricity use with a frequency of once per second; and
wherein the determining if the EV was charged is performed with a frequency of once per minute, and is based at least in part on the disaggregating of electricity use.
8 . A method, comprising:
associating data from a time-series of paired voltage and current measurements made by a metrology device of an electricity meter with a moving time-window, wherein the moving time-window comprises a plurality of sub-windows having a cumulative duration of the moving time-window;
adding a new sub-window having at least one new paired voltage and current measurement to the moving time-window, and deleting an old sub-window having at least one paired voltage and current measurement from the moving time-window, in a continuing manner;
determining a value of power, P, and a value of volt-amps-reactive (VAR), Q, for each sub-window within the moving time-window, wherein a stream of paired P and Q values is created; and
disaggregating a load measured by the metrology device, based at least in part on the stream of paired P and Q values, to determine if an electric vehicle (EV) was charged.
9 . The method of claim 8 , additionally comprising:
calculating a mean value, a median value, a standard deviation, and at least one additional quantile of the value of P and the value of Q from each of the sub-windows;
wherein the determining if the EV was charged is based in part on the median value, the standard deviation, and the at least one additional quantile of the value of P and the value of Q from each of the sub-windows.
10 . The method of claim 8 , additionally comprising:
sending data to a remote computing device for post-processing, wherein the post-processing infers and summarizes EV charging activity and provides data to a user interface that displays information indicating the EV charging activity.
11 . The method of claim 8 , additionally comprising:
disaggregating electricity use more frequently than once per hour; and
wherein the determining if the EV was charged is performed more frequently than once per day and is based in part on the disaggregating of electricity use.
12 . The method of claim 8 , additionally comprising:
disaggregating electricity use with a frequency of once per second; and
wherein the determining if the EV was charged is performed with a frequency of once per minute, and is based at least in part on the disaggregating of electricity use.
13 . The method of claim 8 , wherein at least part of the method is performed by a stacked model, and wherein method additionally comprises:
training a set of tree-based algorithms on data streams using cross-validation, wherein the data streams comprise data based on mean, median, standard deviation and at least one other quantile of P and Q in multiple windows, and wherein the stacked model is configured for receiving mean, median, standard deviation, and the at least one other quantile of P and Q in the multiple windows.
14 . The method of claim 8 , additionally comprising:
receiving the time-series of paired voltage and current measurements from the metrology device at a pre-processing application, wherein the pre-processing application is defined in one or more memory devices; and
receiving EV charging data at a post-processing application, wherein the post-processing application is defined in the one or more memory devices;
wherein a model comprises the pre-processing application and the post-processing application, and wherein the model is configured to determine if the EV was charged.
15 . One or more non-transitory computer-readable media storing computer-executable instructions that, when executed by one or more processors, configure a computing device to perform actions comprising:
associating data from a time-series of paired voltage and current measurements made by a metrology device of an electricity meter with a moving time-window, wherein the moving time-window comprises a plurality of sub-windows having a cumulative duration of the moving time-window;
adding a new sub-window having at least one new paired voltage and current measurement to the moving time-window, and deleting an old sub-window having at least one paired voltage and current measurement from the moving time-window, in a continuing manner;
determining a value of power, P, and a value of volt-amps-reactive (VAR), Q, for each sub-window within the moving time-window, wherein a stream of paired P and Q values is created; and
disaggregating a load measured by the metrology device, based at least in part on the stream of paired P and Q values, to determine if an EV was charged.
16 . The one or more non-transitory computer-readable media as recited in claim 15 , wherein the actions additionally comprise:
calculating a mean value, a median value, a standard deviation, and at least one additional quantile of the value of P and the value of Q from each of the sub-windows;
wherein the determining if the EV was charged is based in part on the median value, the standard deviation, and the at least one additional quantile of the value of P and the value of Q from each of the sub-windows.
17 . The one or more non-transitory computer-readable media as recited in claim 15 , wherein the actions additionally comprise:
sending data to a remote computing device for post-processing, wherein the post-processing infers and summarizes EV charging activity and provides data to a user interface that displays information indicating the EV charging activity.
18 . The one or more non-transitory computer-readable media as recited in claim 15 , wherein the actions additionally comprise:
disaggregating electricity use more frequently than once per hour; and
wherein the determining if the EV was charged is performed more frequently than once per day and is based in part on the disaggregating of electricity use.
19 . The one or more non-transitory computer-readable media as recited in claim 15 , wherein the actions additionally comprise:
disaggregating electricity use with a frequency of once per second; and
wherein the determining if the EV was charged is performed with a frequency of once per minute, and is based at least in part on the disaggregating of electricity use.
20 . The one or more non-transitory computer-readable media as recited in claim 15 , wherein the actions additionally comprise:
receiving the time-series of paired voltage and current measurements from the metrology device at a pre-processing application, wherein the pre-processing application is defined in the one or more non-transitory computer-readable media; and
receiving EV charging data at a post-processing application, wherein the post-processing application is defined in the one or more non-transitory computer-readable media;
wherein a model comprises the pre-processing application and the post-processing application, and wherein the model is configured to determine if the EV was charged.