Patent Publication Number: US-2022236706-A1

Title: Power grid user classification method and device and computer-readable storage medium

Description:
PRIORITY STATEMENT 
     This application is the national phase under 35 U.S.C. § 371 of PCT International Application No. PCT/CN2019/089103 which has an International filing date of May 29, 2019, which designated the United States of America, the entire contents of each of which are hereby incorporated herein by reference. 
    
    
     FIELD 
     Embodiments of the present invention generally relate to the technical field of electric power, in particular to a power grid user classification method and device and a computer-readable storage medium. 
     BACKGROUND 
     Currently, there is a high demand for user management of a power grid. For example, the problem of power thefts is becoming more and more prominent. The problem not only hinders the development of power supply enterprises, but also severely influences the economic construction of a country and the stability of society. In order to identify a power theft behavior, it is usually necessary to classify users by trade. 
     In the current user management of a power grid, users are classified by trade mainly based on the archival information manually filled in at the registration of users. However, archival information manually filled is not always accurate because of the involvement of human factors. As a result, the results of user classifications may be inaccurate. In addition, manually filling archival information will increase the workload. 
     SUMMARY 
     The power grid user classification and device and the computer-readable storage medium provided in the embodiments of the present invention reduce the manual workload. 
     The technical solutions adopted for the embodiments of the present invention are as follows: 
     At least one embodiment is directed to a power grid user classification method comprises: 
     determining power consumption data of a user in each time segment within a time interval, wherein power consumption data of a user in each time segment comprises power consumption data of the user in each time granularity within the time segment; 
     generating a power consumption mode image of a user within the time interval based on the power consumption data of the user in each time segment within the time interval; and 
     classifying the user based on the image identification result of the power consumption mode image. 
     A power grid user classification device comprises: 
     a power consumption data determination module, configured to determine power consumption data of a user in each time segment within a time interval, wherein power consumption data of a user in each time segment comprises power consumption data of the user in each time granularity within the time segment, 
     an image generation module, configured to generate a power consumption mode image of a user within the time interval based on the power consumption data of the user in each time segment within the time interval, and 
     a classification module, configured to classify the user based on the image identification result of the power consumption mode image. 
     A power grid classification device comprises a processor and a memory, 
     applications which can be executed by the processor and are configured to enable the processor to execute the power grid user classification method are stored in the memory. 
     Computer-readable instructions are stored in a computer-readable storage medium and the computer-readable instructions are configured to execute the power grid user classification method. 
     A computer program product is provided, the computer program product is tangibly stored in a computer-readable medium and comprises computer executable instructions, and at least one processor executes the power grid user classification method of an embodiment when the computer executable instructions are executed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a flowchart of the power grid user classification method in the embodiments of the present invention. 
         FIG. 2  shows examples of time interval, time segment and time granularity in the embodiments of the present invention. 
         FIG. 3  shows a first example of a power consumption mode image in the embodiments of the present invention. 
         FIG. 4  shows a second example of a power consumption mode image in the embodiments of the present invention. 
         FIG. 5  compares the power grid user classification processing procedure in the embodiments of the present invention with the power grid user classification processing procedure in the prior art. 
         FIG. 6  shows the structure of the power grid user classification device in the embodiments of the present invention. 
         FIG. 7  shows the structure of the power grid user classification device comprising a processor and a memory in the embodiments of the present invention. 
     
    
    
     DESCRIPTION OF REFERENCE NUMERALS IN THE DRAWINGS 
       
     
       
         
           
               
               
               
             
               
                   
                   
               
               
                   
                 Reference numeral 
                 Meaning 
               
               
                   
                   
               
             
            
               
                   
                 101-103 
                 Step 
               
               
                   
                 501 
                 User 
               
               
                   
                 502 
                 Archival information 
               
               
                   
                 503 
                 Reliability defect 
               
               
                   
                 504 
                 Completeness defect 
               
               
                   
                 505 
                 Power consumption data 
               
               
                   
                 506 
                 Power consumption curve 
               
               
                   
                 507 
                 Feature deletion defect 
               
               
                   
                 508 
                 Power consumption mode image 
               
               
                   
                 509 
                 Classification result 
               
               
                   
                 600 
                 Power grid user classification device 
               
               
                   
                 601 
                 Power consumption data determination 
               
               
                   
                   
                 module 
               
               
                   
                 602 
                 Image generation module 
               
               
                   
                 603 
                 Classification module 
               
               
                   
                 700 
                 Power consumption data determination 
               
               
                   
                   
                 module 
               
               
                   
                 701 
                 Processor 
               
               
                   
                 702 
                 Memory 
               
               
                   
                   
               
            
           
         
       
     
     DETAILED DESCRIPTION OF THE EXAMPLE EMBODIMENTS 
     At least one embodiment is directed to a power grid user classification method comprises: 
     determining power consumption data of a user in each time segment within a time interval, wherein power consumption data of a user in each time segment comprises power consumption data of the user in each time granularity within the time segment; 
     generating a power consumption mode image of a user within the time interval based on the power consumption data of the user in each time segment within the time interval; and 
     classifying the user based on the image identification result of the power consumption mode image. 
     By identifying a power consumption mode image to classify a user and without any necessity of manually filling archival information, the embodiments of the present invention can reduce the manual workload. In addition, the embodiments of the present invention avoid the completeness defect of archival information and improve the classification accuracy. 
     In one embodiment, generating a power consumption mode image of a user within the time interval based on the power consumption data of the user in each time segment within the time interval comprises presenting power consumption data of a user in all time granularities within each time segment according to the chromatic feature corresponding to the value of the power consumption data of the user in a coordinate system where the horizontal axis represents the time segment and the vertical axis represents the time granularity so as to generate a power consumption mode image of the user, and classifying the user based on the image identification result of the power consumption mode image comprises extracting a chromatic feature of the power consumption mode image and classifying the user based on the chromatic feature. 
     Therefore, a power consumption mode image contains a chromatic feature corresponding to the value of the power consumption of a user, and a user can conveniently be classified based on the extracted chromatic feature. In addition, power consumption data is presented by use of time dimensions such as time granularity, time segment and time interval in a power consumption mode image containing a chromatic feature, the number of reflected behavior features of a user is large, and a better classification result can be obtained. 
     In one embodiment, generating a power consumption mode image of a user within the time interval based on the power consumption data of the user in each time segment within the time interval comprises presenting power consumption data of a user in all time granularities within each time segment according to the form feature corresponding to the value of the power consumption data of the user in a coordinate system where the horizontal axis represents the time segment and the vertical axis represents the time granularity so as to generate a power consumption mode image of the user, and classifying the user based on the image identification result of the power consumption mode image comprises extracting a form feature of the power consumption mode image and classifying the user based on the form feature. 
     Therefore, a power consumption mode image contains a form feature corresponding to the value of the power consumption of a user, and a user can conveniently be classified based on the extracted form feature. In addition, power consumption data is presented by use of time dimensions such as time granularity, time segment and time interval in a power consumption mode image containing a form feature, the number of reflected behavior features of a user is large, and a better classification result can be obtained. 
     In one embodiment, generating a power consumption mode image of a user within the time interval based on the power consumption data of the user in each time segment within the time interval comprises presenting power consumption data of a user in all time granularities within each time segment according to the textural feature corresponding to the value of the power consumption data of the user in a coordinate system where the horizontal axis represents the time segment and the vertical axis represents the time granularity so as to generate a power consumption mode image of the user, and classifying the user based on the image identification result of the power consumption mode image comprises extracting a textural feature of the power consumption mode image and classifying the user based on the textural feature. 
     Therefore, a power consumption mode image contains a textural feature corresponding to the value of the power consumption of a user, and a user can conveniently be classified based on the extracted textural feature. In addition, power consumption data is presented by use of time dimensions such as time granularity, time segment and time interval in a power consumption mode image containing a textural feature, the number of reflected behavior features of a user is large, and a better classification result can be obtained. 
     In one embodiment, generating a power consumption mode image of a user within the time interval based on the power consumption data of the user in each time segment within the time interval comprises presenting power consumption data of a user in all time granularities within each time segment according to the spatial relationship feature corresponding to the value of the power consumption data of the user in a coordinate system where the horizontal axis represents the time segment and the vertical axis represents the time granularity so as to generate a power consumption mode image of the user, and classifying the user based on the image identification result of the power consumption mode image comprises extracting a spatial relationship feature of the power consumption mode image and classifying the user based on the spatial relationship feature. 
     Therefore, a power consumption mode image contains a spatial relationship feature corresponding to the value of the power consumption of a user, and a user can conveniently be classified based on the extracted spatial relationship feature. In addition, power consumption data is presented by use of time dimensions such as time granularity, time segment and time interval in a power consumption mode image containing a spatial relationship feature, the number of reflected behavior features of a user is large, and a better classification result can be obtained. 
     In one embodiment, the time granularity is an hour, the time segment is a day, and the time interval is a week, or 
     the time granularity is an hour, the time segment is a day, and the time interval is a month, or 
     the time granularity is an hour, the time segment is a day, and the time interval is a quarter, or 
     the time granularity is an hour, the time segment is a day, and the time interval is a year, or 
     the time granularity is a minute, the time segment is an hour, and the time interval is a day, or 
     the time granularity is a minute, the time segment is an hour, and the time interval is a week, or 
     the time granularity is a minute, the time segment is an hour, and the time interval is a month, or 
     the time granularity is a minute, the time segment is an hour, and the time interval is a quarter, or 
     the time granularity is a minute, the time segment is an hour, and the time interval is a year. 
     It can be seen that the time granularity, time segment and time interval can be divided in a plurality of ways which power grid enterprises can conveniently select. 
     A power grid user classification device comprises: 
     a power consumption data determination module, configured to determine power consumption data of a user in each time segment within a time interval, wherein power consumption data of a user in each time segment comprises power consumption data of the user in each time granularity within the time segment,
         an image generation module, configured to generate a power consumption mode image of a user within the time interval based on the power consumption data of the user in each time segment within the time interval, and   a classification module, configured to classify the user based on the image identification result of the power consumption mode image.       

     By identifying a power consumption mode image to classify a user and without any necessity of manually filling archival information, the embodiments of the present invention can reduce the manual workload. In addition, the embodiments of the present invention avoid the completeness defect of archival information and improve the classification accuracy. 
     In one embodiment, the image generation module is configured to present power consumption data of a user in all time granularities within each time segment according to the chromatic feature corresponding to the value of the power consumption data of the user in a coordinate system where the horizontal axis represents the time segment and the vertical axis represents the time granularity so as to generate a power consumption mode image of the user, and the classification module is configured to extract a chromatic feature of the power consumption mode image and classify the user based on the chromatic feature. 
     Therefore, a power consumption mode image contains a chromatic feature corresponding to the value of the power consumption of a user, and a user can conveniently be classified based on the extracted chromatic feature. In addition, power consumption data is presented by use of time dimensions such as time granularity, time segment and time interval in a power consumption mode image containing a chromatic feature, the number of reflected behavior features of a user is large, and a better classification result can be obtained. 
     In one embodiment, the image generation module is configured to present power consumption data of a user in all time granularities within each time segment according to the form feature corresponding to the value of the power consumption data of the user in a coordinate system where the horizontal axis represents the time segment and the vertical axis represents the time granularity so as to generate a power consumption mode image of the user, and the classification module is configured to extract a form feature of the power consumption mode image and classify the user based on the form feature. 
     Therefore, a power consumption mode image contains a form feature corresponding to the value of the power consumption of a user, and a user can conveniently be classified based on the extracted form feature. In addition, power consumption data is presented by use of time dimensions such as time granularity, time segment and time interval in a power consumption mode image containing a form feature, the number of reflected behavior features of a user is large, and a better classification result can be obtained. 
     In one embodiment, the image generation module is configured to present power consumption data of a user in all time granularities within each time segment according to the textural feature corresponding to the value of the power consumption data of the user in a coordinate system where the horizontal axis represents the time segment and the vertical axis represents the time granularity so as to generate a power consumption mode image of the user, and the classification module is configured to extract a textural feature of the power consumption mode image and classify the user based on the textural feature. 
     Therefore, a power consumption mode image contains a textural feature corresponding to the value of the power consumption of a user, and a user can conveniently be classified based on the extracted textural feature. In addition, power consumption data is presented by use of time dimensions such as time granularity, time segment and time interval in a power consumption mode image containing a textural feature, the number of reflected behavior features of a user is large, and a better classification result can be obtained. 
     In one embodiment, the image generation module is configured to present power consumption data of a user in all time granularities within each time segment according to the spatial relationship feature corresponding to the value of the power consumption data of the user in a coordinate system where the horizontal axis represents the time segment and the vertical axis represents the time granularity so as to generate a power consumption mode image of the user, and the classification module is configured to extract a spatial relationship feature of the power consumption mode image and classify the user based on the spatial relationship feature. 
     Therefore, a power consumption mode image contains a spatial relationship feature corresponding to the value of the power consumption of a user, and a user can conveniently be classified based on the extracted spatial relationship feature. In addition, power consumption data is presented by use of time dimensions such as time granularity, time segment and time interval in a power consumption mode image containing a spatial relationship feature, the number of reflected behavior features of a user is large, and a better classification result can be obtained. 
     A power grid classification device comprises a processor and a memory, applications which can be executed by the processor and are configured to enable the processor to execute the power grid user classification method are stored in the memory. 
     Computer-readable instructions are stored in a computer-readable storage medium and the computer-readable instructions are configured to execute the power grid user classification method. 
     A computer program product is provided, the computer program product is tangibly stored in a computer-readable medium and comprises computer executable instructions, and at least one processor executes the power grid user classification method of an embodiment when the computer executable instructions are executed. 
     To make clearer the technical solutions and advantages of the present invention, the present invention is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described here are used only to describe the present invention in a descriptive way, but not used to restrict the scope of protection of the present invention. 
     For the purposes of simplicity and intuitiveness of the description, the following gives some representative embodiments to describe the solutions of the present invention. A large amount of details in the embodiments are only used to help to understand the solutions of the present invention. Obviously, the technical solutions of the present invention are not limited to these details, however. To avoid unnecessarily making the solutions of the present invention confusing, some embodiments are not described in detail, and only their frameworks are given. Hereinbelow, the term “comprise” refers to “include but are not limited to” and the term “according to . . . ” refers to “at least according to . . . , but not limited to only according to . . . ”. In view of the linguistic habits of Chinese, the number of a component hereinafter can be one or more or can be understood as at least one, unless otherwise specified. 
     In view of the many defects of user classification based on archival information manually filled at the registration of users in the prior art, the technical solution proposed in the embodiments of the present invention that a power consumption mode image is identified to classify a user can reduce manual workload and improve the classification accuracy. 
       FIG. 1  is a flowchart of the power grid user classification method in the embodiments of the present invention. 
     As shown in  FIG. 1 , the method comprises: 
     Step  101 : Determine power consumption data of a user in each time segment within a time interval, wherein power consumption data of a user in each time segment comprises power consumption data of the user in each time granularity within the time segment. 
     Here, time interval, time segment and time granularity are all units of time. Wherein, the length of a time interval is greater than the length of a time segment, and the length of a time segment is greater than the length of a time granularity. A time interval comprises a plurality of time segments and each time segment comprises a plurality of time granularities. 
       FIG. 2  shows examples of time interval, time segment and time granularity in the embodiments of the present invention. 
     It can be seen from  FIG. 2  that a time interval T 1  comprises a plurality of time segments T 2  and each time segment T 2  comprises a plurality of time granularities T 3 . 
     Wherein, a time interval, time segment and time granularity may be not only natural time such as natural year, natural month or natural day, but also units of time set arbitrarily. 
     For example, a time interval may be a week, a time segment may be a day, and a time granularity may be an hour. In this way, a time interval (a week) comprises 7 time segments and each time segment (a day) comprises 24 time granularities (hours). In this case, in Step  101 , power consumption data (for example, power consumption) of a user in hours in each day in a week is determined based on the reading on a smart electric meter installed for the power grid user or the power consumption database saved on a cloud. 
     For example, a time interval may be a month, a time segment may be a day, and a time granularity may be an hour. In this way, a time interval (a month) comprises 30 time segments and each time segment (a day) comprises 24 time granularities (hours). In this case, in Step  101 , power consumption data (for example, power consumption) of a user in 24 hours in each day in a month is determined based on the reading on a smart electric meter installed for the power grid user or the power consumption database saved on a cloud. 
     For example, a time interval may be a quarter, a time segment may be a day, and a time granularity may be an hour. A time interval (a quarter) may comprise 90 time segments, and each time segment (a day) may comprise 24 time granularities (hours). In this case, in Step  101 , power consumption data (for example, power consumption) of a user in 24 hours in each day in a quarter is determined based on the reading on a smart electric meter installed for the power grid user or the power consumption database saved on a cloud. 
     For example, a time interval may be a year, a time segment may be a day, and a time granularity may be an hour. A time interval (a quarter) may, for example, comprise 365 time segments, and each time segment (a day) may comprise 24 time granularities (hours). In this case, in Step  101 , power consumption data (for example, power consumption) of a user in hours in each day in a year is determined based on the reading on a smart electric meter installed for the power grid user or the power consumption database saved on a cloud. 
     For example, a time interval may be a day, a time segment may be an hour, and a time granularity may be a minute. In this way, a time interval (a day) comprises 24 time segments and each time segment (an hour) comprises 60 time granularities (minutes). In this case, in Step  101 , power consumption data (for example, power consumption) of a user in each minute in a day is determined based on the reading on a smart electric meter installed for the power grid user or the power consumption database saved on a cloud. 
     For example, a time interval may be a week, a time segment may be an hour, and a time granularity may be a minute. In this way, a time interval (a week) comprises 168 time segments and each time segment (an hour) comprises 60 time granularities (minutes). In this case, in Step  101 , power consumption data (for example, power consumption) of a user in each minute in a week is determined based on the reading on a smart electric meter installed for the power grid user or the power consumption database saved on a cloud. 
     For example, a time interval may be a month, a time segment may be an hour, and a time granularity may be a minute. In this way, a time interval (a month) comprises 720 time segments and each time segment (an hour) comprises 60 time granularities (minutes). In this case, in Step  101 , power consumption data (for example, power consumption) of a user in each minute in a month is determined based on the reading on a smart electric meter installed for the power grid user or the power consumption database saved on a cloud. 
     For example, a time interval may be a quarter, a time segment may be an hour, and a time granularity may be a minute. In this way, a time interval (a quarter) comprises 2160 time segments and each time segment (an hour) comprises 60 time granularities (minutes). In this case, in Step  101 , power consumption data (for example, power consumption) of a user in each minute in a quarter is determined based on the reading on a smart electric meter installed for the power grid user. 
     For example, a time interval may be a year, a time segment may be an hour, and a time granularity may be a minute. In this way, a time interval (a year) comprises 8760 time segments and each time segment (an hour) comprises 60 time granularities (minutes). In this case, in Step  101 , power consumption data (for example, power consumption) of a user in each minute in a year is determined based on the reading on a smart electric meter installed for the power grid user. 
     Typical examples of a time interval, a time segment and a time granularity and the acquisition of power consumption data of a user are exemplarily described above. Those skilled in the art can know that the description is only used for the exemplary purpose, but is not used to limit the scope of protection of the embodiments of the present invention. 
     Step  102 : Generate a power consumption mode image of a user within the time interval based on the power consumption data of the user in each time segment within the time interval. 
     Here, a power consumption mode image of a user within the time interval is generated based on the power consumption data of the user in each time segment within the time interval, acquired in Step  101 . The generated power consumption mode image comprises image features corresponding to the value of the power consumption data of the user. 
     Preferably, an image feature such as chromatic feature, textural feature, form feature or spatial relationship feature may be used to represent the value of the power consumption data of the user. 
     In one embodiment, Step  102  comprises presenting power consumption data of a user in all time granularities within each time segment according to the chromatic feature corresponding to the value of the power consumption data of the user in a coordinate system where the horizontal axis represents the time segment and the vertical axis represents the time granularity so as to generate a power consumption mode image of the user. For example, the correspondence relationship between a chromatic feature and a value of power consumption data includes: red indicates a value of power consumption of a user in a high-value interval, orange indicates a value of power consumption of a user in a medium-value interval, and green indicates a value of power consumption of a user in a low-value interval. 
     In one embodiment, Step  102  comprises presenting power consumption data of a user in all time granularities within each time segment according to the form feature corresponding to the value of the power consumption data of the user in a coordinate system where the horizontal axis represents the time segment and the vertical axis represents the time granularity so as to generate a power consumption mode image of the user. For example, the correspondence relationship between a form feature and a value of power consumption data includes: a triangle indicates a value of power consumption of a user in a high-value interval, a square indicates a value of power consumption of a user in a medium-value interval, and a circle indicates a value of power consumption of a user in a low-value interval. 
     In one embodiment, Step  102  comprises presenting power consumption data of a user in all time granularities within each time segment according to the textural feature corresponding to the value of the power consumption data of the user in a coordinate system where the horizontal axis represents the time segment and the vertical axis represents the time granularity so as to generate a power consumption mode image of the user. For example, the correspondence relationship between a textural feature and a value of power consumption data includes: a craquelure texture indicates a value of power consumption of a user in a high-value interval, a mosaic texture indicates a value of power consumption of a user in a medium-value interval, and a granular texture indicates a value of power consumption of user in a low-value interval. 
     In one embodiment, Step  102  comprises presenting power consumption data of a user in all time granularities within each time segment according to the spatial relationship feature corresponding to the value of the power consumption data of the user in a coordinate system where the horizontal axis represents the time segment and the vertical axis represents the time granularity so as to generate a power consumption mode image of the user. For example, the correspondence relationship between a spatial relationship feature and a value of power consumption data includes: a connection/adjacency relationship indicates a value of power consumption of a user in a high-value interval, an overlapping/superimposing relationship indicates a value of power consumption of a user in a medium-value interval, and an inclusion/containment relationship indicates a value of power consumption of a user in a low-value interval. 
     Typical examples of image features and typical examples of correspondence relationships between image features and values of power consumption are exemplarily described above. Those skilled in the art may realize that the description is only used for the exemplary purpose, but is not used to limit the scope of protection of the embodiments of the present invention. 
     The following gives an example of the generation of a power consumption mode image containing chromatic features indicating the values of power consumption data of a user. 
       FIG. 3  shows a first example of a power consumption mode image in the embodiments of the present invention. 
     As shown in  FIG. 3 , in the coordinate system where the horizontal axis (D-axis) represents the day and the vertical axis (H-axis) represents the hour, the time interval is a week (containing 7 days), the time segment is implemented as a day, and the time granularity is implemented as an hour. 
     First, acquire the power consumption of the user in 24 hours in each day within a week based on the reading on the smart electric meter installed for the power grid user or the power consumption database saved on a cloud. 
     Then, determine the display color corresponding to the pixel region of each hour in each day within a week based on the values of the power consumption in 24 hours in each day within a week. 
     To be specific, 
     Determine the display color of the pixel region D 1 H 1  in the coordinate system based on the value of the power consumption in the first hour (H 1 ) in the first day (D 1 ). Wherein, if the power consumption in the first hour (H 1 ) in the first day (D 1 ) is in a high-value interval, the display color of the pixel region D 1 H 1  is red; if the power consumption in the first hour (H 1 ) in the first day (D 1 ) is in a medium-value interval, the display color of the pixel region D 1 H 1  is orange, and if the power consumption in the first hour (H 1 ) in the first day (D 1 ) is in a low-value interval, the display color of the pixel region D 1 H 1  is green. 
     Determine the display color of the pixel region D 1 H 2  in the coordinate system based on the value of the power consumption in the second hour (H 2 ) in the first day (D 1 ). Alike, if the power consumption in the second hour (H 2 ) in the first day (D 1 ) is in a high-value interval, the display color of the pixel region D 1 H 2  is red; if the power consumption in the second hour (H 2 ) in the first day (D 1 ) is in a medium-value interval, the display color of the pixel region D 1 H 2  is orange, and if the power consumption in the second hour (H 2 ) in the first day (D 1 ) is in a low-value interval, the display color of the pixel region D 1 H 2  is green. 
     Determine the display color of the pixel region D 1 H 3  in the coordinate system based on the value of the power consumption in the third hour (H 3 ) in the first day (D 1 ). Alike, if the power consumption in the third hour (H 3 ) in the first day (D 1 ) is in a high-value interval, the display color of the pixel region D 1 H 3  is red; if the power consumption in the third hour (H 2 ) in the first day (D 1 ) is in a medium-value interval, the display color of the pixel region D 1 H 3  is orange, and if the power consumption in the third hour (H 3 ) in the first day (D 1 ) is in a low-value interval, the display color of the pixel region D 1 H 3  is green. 
     Continue to determine the display colors of the corresponding pixel regions in the coordinate system based on the values of the power consumption in the fourth hour (H 4 ) in the first day (D 1 ), in the fifth hour (H 5 ) in the first day (D 1 ), and so on . . . , and finally determine the display color of the pixel region D 1 H 24  in the coordinate system based on the value of the power consumption in the 24th hour (H 24 ) in the first day (D 1 ). Alike, if the power consumption in the 24th hour (H 24 ) in the first day (D 1 ) is in a high-value interval, the display color of the pixel region D 1 H 24  is red; if the power consumption in the 24th hour (H 2 ) in the first day (D 1 ) is in a medium-value interval, the display color of the pixel region D 1 H 24  is orange, and if the power consumption in the 24th hour (H 24 ) in the first day (D 1 ) is in a low-value interval, the display color of the pixel region D 1 H 24  is green. 
     So far, the colors of the pixel regions of all 24 hours in the first day have been determined. 
     Then, and so on . . . , determine the display colors of the pixel regions of all 24 hours in the second day, third day, . . . and seventh day to complete the color determination of all pixel regions within a week. 
     The image finally formed in the above-mentioned way is the power consumption mode image within a week, and the chromatic features contained in the power consumption mode image indicate the value of the power consumption of a user in each time granularity in each time segment within a time interval. 
     The following gives an example of the generation of a power consumption mode image containing form features indicating the values of power consumption data of a user. 
       FIG. 4  shows a second example of a power consumption mode image in the embodiments of the present invention. 
     As shown in  FIG. 4 , in the coordinate system where the horizontal axis (H-axis) represents the hour and the vertical axis (M-axis) represents the minute, the time interval is a day (containing 24 hours), the time segment is implemented as an hour (containing 60 minutes) and the time granularity is implemented as a minute. 
     First, acquire the power consumption of the user in each minute in each hour within a day based on the reading on the smart electric meter installed for the power grid user or the power consumption database saved on a cloud. 
     Then, determine the display form of the pixel region corresponding to each minute in each hour within a day based on the value of the power consumption in each minute in each hour within a day. 
     To be specific, 
     Determine the display form of the pixel region H 1 M 1  in the coordinate system based on the value of the power consumption in the first minute (M 1 ) in the first hour (H 1 ). Wherein, if the power consumption in the first minute (M 1 ) in the first hour (H 1 ) is in a high-value interval, the display form of the pixel region H 1 M 1  is a triangle; if the power consumption in the first minute (M 1 ) in the first hour (H 1 ) is in a medium-value interval, the display form of the pixel region H 1 M 1  is a square, and if the power consumption in the first minute (M 1 ) in the first hour (H 1 ) is in a low-value interval, the display form of the pixel region H 1 M 1  is a circle. 
     Determine the display form of the pixel region H 1 M 2  in the coordinate system based on the value of the power consumption in the second minute (M 2 ) in the first hour (H 1 ). Alike, if the power consumption in the second minute (M 2 ) in the first hour (H 1 ) is in a high-value interval, the display form of the pixel region H 1 M 2  is a triangle; if the power consumption in the second minute (M 2 ) in the first hour (H 1 ) is in a medium-value interval, the display form of the pixel region H 1 M 2  is a square, and if the power consumption in the second minute (M 2 ) in the first hour (H 1 ) is in a low-value interval, the display form of the pixel region H 1 M 2  is a circle. 
     Determine the display form of the pixel region H 1 M 3  in the coordinate system based on the value of the power consumption in the third minute (M 3 ) in the first hour (H 1 ). Wherein, if the power consumption in the third minute (M 3 ) in the first hour (H 1 ) is in a high-value interval, the display form of the pixel region H 1 M 3  is a triangle; if the power consumption in the third minute (M 3 ) in the first hour (H 1 ) is in a medium-value interval, the display form of the pixel region H 1 M 3  is a square, and if the power consumption in the third minute (M 3 ) in the first hour (H 1 ) is in a low-value interval, the display form of the pixel region H 1 M 3  is a circle. 
     Continue to determine the display forms of the corresponding pixel regions in the coordinate system based on the values of the power consumption in the fourth minute (M 4 ) in the first hour (H 1 ), in the fifth minute (M 5 ) in the first hour (H 1 ), and so on . . . , and finally determine the display form of the pixel region H 1 M 60  in the coordinate system based on the value of the power consumption in the 60th minute (M 60 ) in the first hour (H 1 ). Alike, if the power consumption in the 60th minute (M 60 ) in the first hour (H 1 ) is in a high-value interval, the display form of the pixel region H 1 M 60  is a triangle; if the power consumption in the 60th minute (M 60 ) in the first hour (H 1 ) is in a medium-value interval, the display form of the pixel region H 1 M 60  is a square, and if the power consumption in the 60th minute (M 1 ) in the first hour (H 1 ) is in a low-value interval, the display form of the pixel region H 1 M 60  is a circle. 
     So far, the forms of the pixel regions of all 60 minutes in the first hour have been determined. Then, and so on . . . , determine the display forms of the pixel regions of all 60 minutes in the second hour, third hour, . . . and 24th hour to complete the form determination of all pixel regions within a day. 
     The image finally formed in the above-mentioned way is the power consumption mode image within a day, and the form features contained in the power consumption mode image indicate the value of the power consumption of a user in each time granularity in each time segment within a time interval. 
     Typical examples of the generation of power consumption mode images containing image features indicating the values of power consumption data of a user, such as chromatic features and form features, are described above. Those skilled in the art may realize that power consumption mode images containing image features such as textural features or spatial relationship features may be generated in a similar way. The image features are not restricted in the embodiments of the present invention. 
     Step  103 : Classify the user based on the image identification result of the power consumption mode image. 
     Here, the image recognition technology is utilized to extract image features from the power consumption mode image and then the user is classified based on the extracted image features. 
     When the power consumption mode image contains chromatic features, Step  103  comprises: extracting chromatic features of the power consumption mode image and classifying the user based on the chromatic features. When the power consumption mode image contains form features, Step  103  comprises: extracting form features of the power consumption mode image and classifying the user based on the form features. When the power consumption mode image contains textural features, Step  103  comprises: extracting textural features of the power consumption mode image and classifying the user based on the textural features. When the power consumption mode image contains spatial relationship features, Step  103  comprises: extracting spatial relationship features of the power consumption mode image and classifying the user based on the spatial relationship features. 
     For example, the machine learning method, fractal feature method or wavelet moment method may be adopted to extract image features and classify a user. In the machine learning method, supervised learning, unsupervised learning, semi-supervised learning or a clustering algorithm may be adopted to realize user classification. 
     In one embodiment, a feature template corresponding to the attributes of a trade is preset, and the extracted image features are compared with the feature template to determine the class of the trade a user belongs to. 
     In one embodiment, a convolutional neural network is trained based on training samples, and the extracted image features are input into the convolutional neural network to determine the class of the trade a user belongs to. 
     In one embodiment, the extracted image features are clustered based on a clustering algorithm such as K-means clustering algorithm to determine the class of the trade a user belongs to. 
     Specific ways of realizing user classification are exemplarily described above. Those skilled in the art may realize that the description is only used for the exemplary purpose, but is not used to limit the scope of protection of the embodiments of the present invention. 
       FIG. 5  compares the power grid user classification processing procedure in the embodiments of the present invention with the power grid user classification processing procedure in the prior art. 
     In  FIG. 5 , a user  501  is usually classified based on archival information  502  in the prior art. Since archival information manually filled is not always correct or complete, this classification method has a reliability defect  503  and a completeness defect  504 . 
     Power consumption data  505  may be collected for a user  501 . In the prior art, a user may also be classified based on a power consumption curve  506  generated from power consumption data  505 . However, a power consumption curve  506  can display power consumption data only in one time dimension, and the power consumption curve can reflect a single user behavior feature. Therefore, this classification method has a feature deletion defect  507 . 
     In the embodiments of the present invention, power consumption data  505  is collected for a user  501 , and a power consumption mode image  508  is generated for classification based on user data  505  and the divisions of the time interval, time segment and time granularity. In a power consumption mode image  508 , power consumption data is presented by use of time dimensions such as time granularity, time segment and time interval, the number of reflected behavior features of a user is large, and a better classification result  509  can be obtained. 
     Based on the description above, the embodiments of the present invention further provide a power grid user classification device. 
       FIG. 6  shows the structure of the power grid user classification device in the embodiments of the present invention. 
     As shown in  FIG. 6 , the power grid user classification device  600  comprises: 
     a power consumption data determination module  601 , configured to determine power consumption data of a user in each time segment within a time interval, wherein power consumption data of a user in each time segment comprises power consumption data of the user in each time granularity within the time segment,
         an image generation module  602 , configured to generate a power consumption mode image of a user within the time interval based on the power consumption data of the user in each time segment within the time interval, and   a classification module  603 , configured to classify the user based on the image identification result of the power consumption mode image.       

     In one embodiment, the image generation module  601  is configured to present power consumption data of a user in all time granularities within each time segment according to the chromatic feature corresponding to the value of the power consumption data of the user in a coordinate system where the horizontal axis represents the time segment and the vertical axis represents the time granularity so as to generate a power consumption mode image of the user, and the classification module  602  is configured to extract a chromatic feature of the power consumption mode image and classify the user based on the chromatic feature. 
     In one embodiment, the image generation module  601  is configured to present power consumption data of a user in all time granularities within each time segment according to the form feature corresponding to the value of the power consumption data of the user in a coordinate system where the horizontal axis represents the time segment and the vertical axis represents the time granularity so as to generate a power consumption mode image of the user, and the classification module  602  is configured to extract a form feature of the power consumption mode image and classify the user based on the form feature. 
     In one embodiment, the image generation module  601  is configured to present power consumption data of a user in all time granularities within each time segment according to the textural feature corresponding to the value of the power consumption data of the user in a coordinate system where the horizontal axis represents the time segment and the vertical axis represents the time granularity so as to generate a power consumption mode image of the user, and the classification module  602  is configured to extract a textural feature of the power consumption mode image and classify the user based on the textural feature. 
     In one embodiment, the image generation module  602  is configured to present power consumption data of a user in all time granularities within each time segment according to the spatial relationship feature corresponding to the value of the power consumption data of the user in a coordinate system where the horizontal axis represents the time segment and the vertical axis represents the time granularity so as to generate a power consumption mode image of the user, and the classification module  603  is configured to extract a spatial relationship feature of the power consumption mode image and classify the user based on the spatial relationship feature. 
     The embodiments of the present invention further provide a power grid user classification device comprising a processor and a memory. 
       FIG. 7  shows the structure of the power grid user classification device comprising a processor and a memory in the embodiments of the present invention. 
     As shown in  FIG. 7 , the power grid user classification device  700  comprises a processor  701  and a memory  702 , and applications which can be executed by the processor  701  and are configured to enable the processor  701  to execute the power consumption abnormality identification method are stored in the memory  702 . 
     Wherein, the memory  702  may be specifically implemented as an electrically erasable programmable read-only memory (EEPROM), a flash memory, a programmable ready-only memory (PROM) or other storage media. The processor  701  may be implemented as one or more processors or one or more field programmable gate arrays (FPGAs), wherein one or more central processing unit cores are integrated in the FPGA. 
     Specifically, the central processing unit or the central processing unit core may be implemented as a CPU or MCU. 
     It should be noted that not all steps or modules in the above-mentioned flowcharts and system structure diagrams are required, and some steps or modules can be omitted, depending on the actual requirements. The execution sequence of the steps is not fixed and may be adjusted as required. The system structures described in the above-mentioned embodiments can be physical structures or logical structures. That is to say, some modules may be realized by a physical entity, or some modules may be realized by a plurality of physical entities or may jointly be realized by some components in a plurality of self-contained devices. 
     The hardware modules in different embodiments can mechanically or electronically be realized. For example, a hardware module may comprise specially designed permanent circuits or logic devices (for example, application-specific processors such as FPGA or ASIC) to complete specific operations. A hardware module may also comprise programmable logic devices or circuits (for example, general processors or other programmable processors) temporarily configured by software to perform specific operations. Whether a hardware module is realized mechanically, or by use of a dedicated permanent circuit or a temporarily configured circuit (for example, configured by software) may depend on the considerations of the cost and the time. 
     An embodiment of the present invention further provides a machine-readable storage medium, in which instructions allowing a machine to execute the method described in this document are stored. Specifically, a system or device equipped with a storage medium may be provided. Software program codes which may realize the function in any of above-mentioned embodiments are stored in the storage medium and the computer (or CPU or MPU) of the system or device may read and execute the program codes stored in the storage medium. In addition, through the commands based on the program codes, the operating system on the computer may complete a part of or all of practical operations. In addition, the program codes read out of the storage medium may be written into the memory in an expansion board in the computer or may be written into the memory in an expansion unit connected to the computer, and then the commands based on the program codes let the CPU installed on the expansion board or expansion unit execute a part or all of practical operations to realize the function in any of the above-mentioned embodiments. 
     The storage medium used to provide program codes includes a floppy disk, hard disk, magneto-optical disk, optical disk (for example, CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), magnetic tape, non-volatile memory card, and ROM. Alternatively, program codes can be downloaded from a server computer or cloud over a communication network. 
     The embodiments of the present invention provide a computer program product, the computer program product is tangibly stored in a computer-readable medium and comprises computer executable instructions, and at least one processor executes the power grid user classification method as claimed in any of claims  1  to  6  when the computer executable instructions are executed. 
     The embodiments described above are preferred embodiments of the present invention, but are not used to limit the scope of protection of the present invention. Any modification, equivalent replacement, and improvement within the spirit and principle of the present invention should fall within the scope of protection of the present invention.