CN113295915A - Current calibration method and system for power grid collector and storage medium - Google Patents
Current calibration method and system for power grid collector and storage medium Download PDFInfo
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Abstract
The invention relates to a method, a system and a storage medium for checking the current of a power grid collector, wherein when the collector collects the data of an electric meter, the temperature distribution image of the electric meter area is collected through an infrared temperature sensor to obtain the current and the temperature difference between a house cable and the environment, and the square of the current and the corresponding temperature difference are fitted through a plurality of collected data to check the electric meter current collected by the collector.
Description
Technical Field
The invention relates to the technical field of power grid collectors, in particular to a method and a system for checking current of a power grid collector and a storage medium.
Background
The existing user electricity consumption information acquisition system realizes electricity consumption monitoring, stepped pricing, load management and line loss analysis by acquiring and analyzing electricity consumption data of a distribution transformer and a terminal user, and finally achieves the purposes of automatic meter reading, peak load shifting electricity consumption, electricity consumption inspection (electricity stealing prevention), load prediction, electricity consumption cost saving and the like. Establish comprehensive user power consumption information acquisition system and need the concentrator, collector and smart electric meter, the power consumption condition of satisfying normal installation power cable that current user power consumption acquisition system can be better, however partial area's ammeter installation area lacks strict management, the condition of the indiscriminate cable of connecing of drawing exists privately, when having cable short circuit ammeter input and output, the unable normal statistics power consumption condition of ammeter, current user power consumption information acquisition system can't carry out the check-up to the electric current of the cable of registering one's residence, and the indiscriminate cable of drawing privately lacks strict construction standard, there is very big potential safety hazard.
Infrared thermal imaging uses a photoelectric technology to detect infrared specific waveband signals of object thermal radiation, converts the signals into images and graphs which can be distinguished by human vision, and can further calculate temperature values.
Due to the requirement of body temperature measurement in public places caused by global epidemic situations, the infrared thermal imaging technology is rapidly developed, the hardware cost of the infrared thermal imaging instrument is continuously reduced along with the maturity of the technology and the expansion of the market, and the cost requirement of the power grid collector applying the technology can be gradually met.
Disclosure of Invention
The invention provides a current checking method and system for a power grid collector, which are characterized in that the current information and a temperature distribution diagram are collected while the power consumption information is collected by the power grid collector, and the collected current information is checked through the temperature of a house-entry cable, so that the technical problem that the ammeter data collected by the power grid collector is not checked in the prior art is solved, the technical effect that the collected data is checked by the power grid collector is achieved, the accuracy of the data is improved, and the electricity utilization safety is guaranteed.
The invention provides a power grid collector current checking method which comprises the following steps:
collecting a temperature distribution diagram in a preset area through an infrared temperature sensor when a collector collects ammeter data, and storing the current of each ammeter and the corresponding temperature distribution diagram into a database;
calculating the difference between the house cable and the ambient temperature according to the temperature distribution map, and fitting the square of the current in the database and the corresponding temperature difference to obtain a fitting function;
and checking the current data in the database by using the fitting function, deleting the current data and the corresponding temperature difference data of which the checking results are greater than a preset error threshold value in the database, and reporting the data exception.
Preferably, the step of calculating the difference between the house cable and the ambient temperature according to the temperature distribution map, and fitting the square of the current in the database and the corresponding temperature difference to obtain a fitting function specifically includes:
processing the temperature distribution map by using an image sharpening algorithm to obtain a sharpened temperature distribution map;
processing the contrast of the sharpened temperature distribution diagram according to a preset template and converting the contrast into a gray scale map to obtain a processed temperature distribution diagram;
extracting the temperature and the ambient temperature of each house cable from the processed temperature distribution map by using an image recognition algorithm, and calculating the difference value between the temperature and the ambient temperature of the house cables;
and fitting the square of the current in the database and the corresponding temperature difference value to obtain a fitting function.
Preferably, the verifying the data in the database by using the fitting function, deleting the data which fails to be verified in the database, and reporting the data abnormality specifically includes:
verifying the data in the database using the fitting function;
when data with a verification result larger than a preset error threshold exist, deleting the data with the verification result larger than the preset error threshold in the database, comparing the current temperature distribution diagram with the temperature distribution diagram when all data in the historical data of the database pass the verification, and judging whether a newly added cable exists or not;
when a newly added cable exists, reporting that the power stealing phenomenon exists; and when the newly added cable does not exist, reporting that the temperature of the cable is abnormal.
Preferably, the method further comprises the following steps:
comparing all temperature distribution diagrams in the database, and performing multi-frame fusion on the temperature distribution diagrams with the same cable number;
and replacing the original temperature distribution map with the same number of cables by using the fused image.
Preferably, the step of calculating a difference between the house cable and the ambient temperature according to the temperature distribution map, and fitting the square of the current in the database and the corresponding temperature difference to obtain a fitting function further includes:
training the square of the current in the database and the difference value between the house cable and the environment by using a BP (back propagation) neural network, and setting the iteration times by taking the measurement precision of the infrared temperature sensor as a training target;
and replacing the fitting function with the training result of the iteration times.
Preferably, the method further comprises the following steps:
and extracting the highest temperature in the temperature distribution diagram, reporting abnormal temperature and deleting the current and the temperature distribution diagram currently collected in the database when the highest temperature is greater than a temperature threshold value.
The invention also provides a current checking system of the power grid collector, which comprises the following components:
the data acquisition unit is used for acquiring a temperature distribution diagram in a preset area through the infrared temperature sensor when the acquisition unit acquires the data of the electric meters, and storing the current of each electric meter and the corresponding temperature distribution diagram into the database;
the function calculation unit is used for calculating the difference value between the home cable and the ambient temperature according to the temperature distribution map, and fitting the square of the current in the database and the corresponding temperature difference value to obtain a fitting function;
and the data checking unit is used for checking the current data in the database by using the fitting function, deleting the current data with the checking result larger than a preset error threshold value and the corresponding temperature difference data in the database, and reporting the data abnormality.
The invention further provides a readable storage medium, wherein a power grid collector current check program is stored on the readable storage medium, and the power grid collector current check program realizes the steps of the power grid collector current check method when being executed by the processor.
According to the invention, when the collector collects ammeter data, the temperature distribution image of the ammeter area is collected through the infrared temperature sensor, so that the temperature difference between the current and the environment of the household cable is obtained, and the square of the current and the corresponding temperature difference are fitted through a plurality of collected data, so that the ammeter current collected by the collector is verified.
Drawings
Fig. 1 is a schematic structural diagram of a server in a hardware operating environment according to an embodiment of a power grid collector current verification method of the present invention;
fig. 2 is a schematic flow chart of another embodiment of the power grid collector current verification method of the present invention;
fig. 3 is a schematic flow chart of another embodiment of the power grid collector current verification method of the present invention;
fig. 4 is a functional block diagram of the current verification system of the power grid collector of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with specific embodiments, the examples given are intended to illustrate the invention and are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a server structure of a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the server may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may comprise a Display screen (Display), and the optional user interface 1003 may also comprise a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage server separate from the processor 1001.
Those skilled in the art will appreciate that the architecture shown in FIG. 1 does not constitute a limitation on the servers, and may include more or fewer components than those shown, or some components in combination, or a different arrangement of components.
As shown in fig. 1, the memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a grid collector current verification program.
In the network device shown in fig. 1, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting peripheral equipment; the network device calls the grid collector current verification program stored in the memory 1005 through the processor 1001, and performs the following operations:
collecting a temperature distribution diagram in a preset area through an infrared temperature sensor when a collector collects ammeter data, and storing the current of each ammeter and the corresponding temperature distribution diagram into a database;
calculating the difference between the house cable and the ambient temperature according to the temperature distribution map, and fitting the square of the current in the database and the corresponding temperature difference to obtain a fitting function;
and checking the current data in the database by using the fitting function, deleting the current data and the corresponding temperature difference data of which the checking results are greater than a preset error threshold value in the database, and reporting the data exception.
Further, calculating a difference between the house cable and the ambient temperature according to the temperature distribution map, and fitting the square of the current in the database and the corresponding temperature difference to obtain a fitting function specifically comprises the following steps:
processing the temperature distribution map by using an image sharpening algorithm to obtain a sharpened temperature distribution map;
processing the contrast of the sharpened temperature distribution diagram according to a preset template and converting the contrast into a gray scale map to obtain a processed temperature distribution diagram;
extracting the temperature and the ambient temperature of each house cable from the processed temperature distribution map by using an image recognition algorithm, and calculating the difference value between the temperature and the ambient temperature of the house cables;
and fitting the square of the current in the database and the corresponding temperature difference value to obtain a fitting function.
Further, verifying the data in the database by using the fitting function, deleting the data which fails to be verified in the database, and reporting the data abnormality specifically includes:
verifying the data in the database using the fitting function;
when data with a verification result larger than a preset error threshold exist, deleting the data with the verification result larger than the preset error threshold in the database, comparing the current temperature distribution diagram with the temperature distribution diagram when all data in the historical data of the database pass the verification, and judging whether a newly added cable exists or not;
when a newly added cable exists, reporting that the power stealing phenomenon exists; and when the newly added cable does not exist, reporting that the temperature of the cable is abnormal.
Further, still include:
comparing all temperature distribution diagrams in the database, and performing multi-frame fusion on the temperature distribution diagrams with the same cable number;
and replacing the original temperature distribution map with the same number of cables by using the fused image.
Further, calculating a difference between the house cable and the ambient temperature according to the temperature distribution map, and fitting the square of the current in the database and the corresponding temperature difference to obtain a fitting function, and then:
training the square of the current in the database and the difference value between the house cable and the environment by using a BP (back propagation) neural network, and setting the iteration times by taking the measurement precision of the infrared temperature sensor as a training target;
and replacing the fitting function with the training result of the iteration times.
Further, still include:
and extracting the highest temperature in the temperature distribution diagram, reporting abnormal temperature and deleting the current and the temperature distribution diagram currently collected in the database when the highest temperature is greater than a temperature threshold value.
The temperature distribution image that this embodiment was gathered the ammeter region through infrared temperature sensor when the collector gathered ammeter data, obtain the difference in temperature of electric current and house entry cable and environment, and the square of a plurality of data fitting electric currents through the collection and the temperature difference who corresponds, and then check-up is carried out to the ammeter electric current that the collector was collected, the electric meter data that the electric wire netting collector who has solved existence among the prior art gathered do not pass through the technical problem of check-up, the technical effect that the electric wire netting collector carried out the check-up to the data of gathering has been reached, the accuracy of data is improved, the power consumption safety has been ensured.
Based on the hardware structure, the embodiment of the current checking method of the power grid collector is provided.
The power grid collector current verification method described with reference to fig. 2 includes the following steps:
s10, collecting a temperature distribution diagram in a preset area through an infrared temperature sensor when the collector collects the electric meter data, and storing the current of each electric meter and the corresponding temperature distribution diagram into a database;
it is easy to understand that the preset area can be adjusted according to the installation position of the electric meter, and the temperature distribution diagram includes the temperature of each electric meter, the temperature of the input cable of the electric meter, the temperature of the output cable of the electric meter, the ambient temperature and the temperature of the service cable.
S20, calculating the difference between the house cable and the ambient temperature according to the temperature distribution map, and fitting the square of the current in the database and the corresponding temperature difference to obtain a fitting function;
it should be noted that, when the temperature change is small, the influence caused by the internal resistance change due to the temperature change of the cable may not be considered, and a linear relationship is formed between the square of the current and the corresponding temperature difference, so that when the calculation performance is low, a fitting function may be obtained through simple linear fitting.
And S30, checking the current data in the database by using the fitting function, deleting the current data with the checking result larger than a preset error threshold value and the corresponding temperature difference data in the database, and reporting that the data are abnormal.
It should be emphasized that the database further includes historical data, and usually only the latest acquired data needs to be checked, and as the data amount is continuously increased, the accuracy of the fitting function is continuously increased, so the historical data also has the necessity of checking.
The temperature distribution image that this embodiment was gathered the ammeter region through infrared temperature sensor when the collector gathered ammeter data, obtain the difference in temperature of electric current and house entry cable and environment, and the square of a plurality of data fitting electric currents through the collection and the temperature difference who corresponds, and then check-up is carried out to the ammeter electric current that the collector was collected, the electric meter data that the electric wire netting collector who has solved existence among the prior art gathered do not pass through the technical problem of check-up, the technical effect that the electric wire netting collector carried out the check-up to the data of gathering has been reached, the accuracy of data is improved, the power consumption safety has been ensured.
Referring to fig. 3, calculating a difference between the house cable and the ambient temperature according to the temperature distribution map, and fitting the square of the current in the database and the corresponding temperature difference to obtain a fitting function specifically includes:
s21, processing the temperature distribution map by using an image sharpening algorithm to obtain a sharpened temperature distribution map;
it is easy to understand that, because the infrared thermal imaging technology of present stage high accuracy is with higher costs, therefore this application handles the temperature distribution map through the image sharpening algorithm to improve the definition of different temperature zone edges in the temperature distribution map, this step still can be through gathering the temperature distribution map many times, and then use the synthetic mode of multiframe to improve the resolution ratio of temperature distribution map, however the calculated amount of this process is great, and current hardware facilities are difficult to satisfy the operation demand, need upgrade current computing device.
S22, processing the contrast of the sharpened temperature distribution diagram according to a preset template and converting the contrast into a gray scale image to obtain a processed temperature distribution diagram;
it should be noted that, in order to reduce the amount of calculation, the present embodiment increases the success rate of identifying the edges of different temperature regions by pulling up the contrast and the grayscale map of the temperature distribution map, wherein the temperature information represented by different colors is separated and stored before this step, and the above steps are only used to obtain the edges of different temperature regions.
S23, extracting the temperature and the environment temperature of each house cable from the processed temperature distribution map by using an image recognition algorithm, and calculating the difference value between the temperature and the environment temperature of the house cable;
in this embodiment, the cable from the electric meter output cable to the outside of the preset area is regarded as the service cable of the electric meter user, and the highest temperature among the average temperatures of the continuous cables of 1 minute length in the service cable is adopted as the temperature of the service cable.
And S24, fitting the squares of the currents in the database and the corresponding temperature difference values to obtain a fitting function.
It should be emphasized that, when the computing device has a strong computing performance, for example, when data is sent to the concentrator and is computed by the concentrator, the fitting function may be computed by using a neural network, in this case, the influence of the change of the internal resistance of the cable caused by the temperature on the fitting function may be considered, and the fitting function is obtained by using a nonlinear fitting method, and the influence caused by abnormal data should be fully considered when the fitting function is used, so that when the data amount is sufficient, the data with the largest difference from the fitting result may be excluded.
Specifically, the verifying the data in the database by using the fitting function, deleting the data which fails to be verified in the database, and reporting the data abnormality specifically includes:
verifying the data in the database using the fitting function;
when data with a verification result larger than a preset error threshold exist, deleting the data with the verification result larger than the preset error threshold in the database, comparing the current temperature distribution diagram with the temperature distribution diagram when all data in the historical data of the database pass the verification, and judging whether a newly added cable exists or not;
it is easy to understand that when a new household is powered on, a newly added electric meter exists besides a newly added cable, if the installation of the cable and the electric meter meets the existing power grid standard, the verification result should be normal, therefore, when the verification result is abnormal, whether a cable which does not meet the installation standard exists needs to be checked, in the embodiment, the cable installation in the temperature distribution map which passes through the verification in the historical database is regarded as the cable which is installed in the standard, the temperature distribution map of the cable installation standard can be determined in a manually specified mode, or after the abnormal temperature is eliminated, the temperature distribution map of the cable which does not meet the standard is manually deleted.
When a newly added cable exists, reporting that the power stealing phenomenon exists; and when the newly added cable does not exist, reporting that the temperature of the cable is abnormal.
It is easy to understand that, when the cable installed in the standard still has the verification failure, the cable may be aged or has poor contact, and at this time, the temperature abnormality needs to be reported, so that the staff of the power system can perform maintenance.
Specifically, still include:
comparing all temperature distribution diagrams in the database, and performing multi-frame fusion on the temperature distribution diagrams with the same cable number;
and replacing the original temperature distribution map with the same number of cables by using the fused image.
It is easy to understand that after the data verification is completed, the current and temperature difference data and the corresponding temperature distribution map are stored in the database, and the accuracy of the installation positions of the electric meter and the cable can be improved, the number of the temperature distribution maps can be reduced, and the space occupation of the database is greatly reduced by adopting a mode that the original temperature distribution map is replaced by the multi-frame fused temperature distribution map.
Specifically, the step of calculating a difference between the house cable and the ambient temperature according to the temperature distribution map, and fitting the square of the current in the database and the corresponding temperature difference to obtain a fitting function further includes:
training the square of the current in the database and the difference value between the house cable and the environment by using a BP (back propagation) neural network, and setting the iteration times by taking the measurement precision of the infrared temperature sensor as a training target;
and replacing the fitting function with the training result of the iteration times.
It should be noted that, when the calculation performance is sufficient, the BP neural network is used for fitting a function, so that the accuracy can be greatly improved, the existing BP neural network comprises a mathematical model of a multilayer neural network, a forward propagation algorithm, a classical activation function, a classical loss function, an optimization process of the neural network, derivation of a back propagation algorithm, optimization of a gradient descent algorithm, design of an attenuation learning rate and the like, so as to realize model construction of a nonlinear fitting function curve, only the classical activation function is modified, a derivative is determined according to a current heating formula and an internal resistance change table, and the model accuracy is further improved.
Specifically, the method further comprises the following steps:
and extracting the highest temperature in the temperature distribution diagram, reporting abnormal temperature and deleting the current and the temperature distribution diagram currently collected in the database when the highest temperature is greater than a temperature threshold value.
It is easy to understand that when the temperature is greater than the temperature threshold, the temperature of the electric meter or the cable is greater than the safe temperature threshold, and the measured temperature distribution diagram is affected by the abnormal temperature region in a greater error, especially the ambient temperature, which is easily higher.
The embodiment further improves the technical scheme by disclosing a detailed fitting method of the fitting function, and simultaneously provides solutions with different precisions according to different calculation performances, thereby improving the application range; and the accuracy of the original data is improved by removing the abnormal data and the data acquired under the abnormal environmental temperature, so that the accuracy of the fitting function is further improved.
Referring to fig. 4, the present invention further provides a power grid collector current verification system, which includes:
the data acquisition unit 10 is used for acquiring a temperature distribution diagram in a preset area through the infrared temperature sensor when the acquisition device acquires the data of the electric meters, and storing the current of each electric meter and the corresponding temperature distribution diagram into a database;
the function calculation unit 20 is configured to calculate a difference between the home cable and the ambient temperature according to the temperature distribution map, and fit the square of the current in the database and the corresponding temperature difference to obtain a fit function;
and the data checking unit 30 is used for checking the current data in the database by using the fitting function, deleting the current data with the checking result larger than a preset error threshold value and the corresponding temperature difference data in the database, and reporting that the data is abnormal.
Since the system adopts all the technical solutions of all the embodiments, all the beneficial effects brought by the technical solutions of the embodiments are achieved above, and are not described in detail herein.
The invention also proposes a server comprising: the server adopts all technical schemes of all the embodiments, so that all the beneficial effects brought by the technical schemes of the embodiments are achieved, and the details are not repeated herein.
The invention further provides a readable storage medium, wherein a power grid collector current check program is stored in the readable storage medium, and the power grid collector current check program is executed by a processor to realize the steps of the power grid collector current check method.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A power grid collector current verification method is characterized by comprising the following steps:
collecting a temperature distribution diagram in a preset area through an infrared temperature sensor when a collector collects ammeter data, and storing the current of each ammeter and the corresponding temperature distribution diagram into a database;
calculating the difference between the house cable and the ambient temperature according to the temperature distribution map, and fitting the square of the current in the database and the corresponding temperature difference to obtain a fitting function;
and checking the current data in the database by using the fitting function, deleting the current data and the corresponding temperature difference data of which the checking results are greater than a preset error threshold value in the database, and reporting the data exception.
2. The power grid collector current verification method according to claim 1, wherein the step of calculating a difference between a house cable and an ambient temperature according to the temperature distribution map, and fitting a square of a current in the database and a corresponding temperature difference to obtain a fitting function specifically comprises:
processing the temperature distribution map by using an image sharpening algorithm to obtain a sharpened temperature distribution map;
processing the contrast of the sharpened temperature distribution diagram according to a preset template and converting the contrast into a gray scale map to obtain a processed temperature distribution diagram;
extracting the temperature and the ambient temperature of each house cable from the processed temperature distribution map by using an image recognition algorithm, and calculating the difference value between the temperature and the ambient temperature of the house cables;
and fitting the square of the current in the database and the corresponding temperature difference value to obtain a fitting function.
3. The power grid collector current verification method according to claim 1, wherein the verifying the data in the database using the fitting function, deleting data in the database that fails to be verified, and reporting that the data is abnormal specifically comprises:
verifying the data in the database using the fitting function;
when data with a verification result larger than a preset error threshold exist, deleting the data with the verification result larger than the preset error threshold in the database, comparing the current temperature distribution diagram with the temperature distribution diagram when all data in the historical data of the database pass the verification, and judging whether a newly added cable exists or not;
when a newly added cable exists, reporting that the power stealing phenomenon exists; and when the newly added cable does not exist, reporting that the temperature of the cable is abnormal.
4. The power grid collector current verification method of claim 3, further comprising:
comparing all temperature distribution diagrams in the database, and performing multi-frame fusion on the temperature distribution diagrams with the same cable number;
and replacing the original temperature distribution map with the same number of cables by using the fused image.
5. The power grid collector current verification method according to claim 1, wherein the step of calculating a difference between the house cable and the ambient temperature according to the temperature distribution map, and fitting the square of the current in the database and the corresponding temperature difference to obtain a fitting function further comprises:
training the square of the current in the database and the difference value between the house cable and the environment by using a BP (back propagation) neural network, and setting the iteration times by taking the measurement precision of the infrared temperature sensor as a training target;
and replacing the fitting function with the training result of the iteration times.
6. The power grid collector current verification method of claim 1, further comprising:
and extracting the highest temperature in the temperature distribution diagram, reporting abnormal temperature and deleting the current and the temperature distribution diagram currently collected in the database when the highest temperature is greater than a temperature threshold value.
7. The utility model provides a power grid collector current check-up system which characterized in that, power grid collector current check-up system includes:
the data acquisition unit is used for acquiring a temperature distribution diagram in a preset area through the infrared temperature sensor when the acquisition unit acquires the data of the electric meters, and storing the current of each electric meter and the corresponding temperature distribution diagram into the database;
the function calculation unit is used for calculating the difference value between the home cable and the ambient temperature according to the temperature distribution map, and fitting the square of the current in the database and the corresponding temperature difference value to obtain a fitting function;
and the data checking unit is used for checking the current data in the database by using the fitting function, deleting the current data with the checking result larger than a preset error threshold value and the corresponding temperature difference data in the database, and reporting the data abnormality.
8. A readable storage medium, wherein a grid collector current verification program is stored on the readable storage medium, and wherein the grid collector current verification program, when executed by a processor, implements the steps of the grid collector current verification method according to any one of claims 1 to 6.
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