CN115112948A - Multi-branch electric quantity calibration method and device, intelligent terminal and storage medium - Google Patents
Multi-branch electric quantity calibration method and device, intelligent terminal and storage medium Download PDFInfo
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Abstract
The application relates to a multi-branch electric quantity calibration method, a multi-branch electric quantity calibration device, an intelligent terminal and a storage medium, wherein the method comprises the following steps: acquiring real-time electric quantity of a trunk line according to the electric quantity sampling frequency, and then adding a value to the accumulated sampling times; acquiring a branch real-time current value, and calculating to obtain the branch accumulated electric quantity; calculating branch electric quantity balance coefficients to obtain branch correction electric quantities of all branch circuits, and summarizing and summing to obtain branch correction total electric quantities; and when the difference value between the branch circuit corrected total electric quantity and the main circuit real-time electric quantity does not exceed the preset correction threshold, taking the branch circuit corrected electric quantity as the metering electric quantity and outputting the metering electric quantity. The electric quantity of each branch circuit is corrected, so that a more accurate branch circuit metering result can be obtained on the premise of not independently arranging the electric energy meter.
Description
Technical Field
The application relates to the technical field of electrical calibration, in particular to a multi-branch electric quantity calibration method and device, an intelligent terminal and a storage medium for a new energy automobile charging scene.
Background
With the rapid development of new energy vehicles and the rapid increase of the reserves of new energy vehicles in cities, in order to meet the charging requirements of the new energy vehicles to the maximum extent, a plurality of branch circuits are arranged in the charging and power supply circuit of the new energy vehicles at the present stage and are used for charging the new energy vehicles independently.
For the charging and power supplying circuit of the new energy automobile, how to accurately know the electric quantity of each branch circuit and perform metering charging according to the electric quantity is an important function. In the scene of many branch circuit supplies power simultaneously, the user can be in the general inlet wire direction of circuit, install total electric energy meter additional on the trunk circuit promptly and obtain the electric quantity value and regard it as follow-up electric energy measurement's basis, generally adopt two kinds of modes to the acquireing of each branch circuit electric quantity, data analog computation promptly or independently install electric energy meter additional.
In practical applications, technicians find that there are significant disadvantages to the above two ways of obtaining the power of the branch circuit. Firstly, due to the problems of line loss, data acquisition precision and the like, the deviation between the electric quantity value of each branch circuit and the electric quantity value of a main circuit is large frequently caused by a data analog calculation mode, and further, the metering result is inaccurate and the mischarging is generated. And secondly, the mode of independently installing the electric energy meter not only can greatly improve the hardware setting cost, but also the installation of the electric energy meter needs the assistance cooperation of a city power supply department, and the whole engineering construction process and the subsequent system operation and maintenance process can bring small workload.
Therefore, how to provide a multi-branch power calibration scheme capable of ensuring accuracy of a measurement result and effectively controlling a hardware setting cost to overcome the above-mentioned drawbacks in the related art is a problem to be solved by those skilled in the art.
Disclosure of Invention
In order to effectively control the hardware setting cost while ensuring the accuracy of the measurement result of the branch circuit, the application provides a multi-branch electric quantity calibration method, a multi-branch electric quantity calibration device and an intelligent terminal.
In a first aspect, the present application provides a multi-branch electric quantity calibration method, which adopts the following technical scheme:
a multi-branch electric quantity calibration method is matched with a multi-branch charging system, the multi-branch charging system comprises a total electric energy meter arranged on a trunk circuit and branch current transformers arranged on branch circuits, and the method comprises the following steps:
acquiring real-time electric quantity of the trunk line according to a preset electric quantity sampling frequency, and adding an assignment to the accumulated sampling times after sampling is finished;
acquiring branch real-time current values of all branch circuits, and calculating by combining the accumulated sampling times to obtain the branch accumulated electric quantity of each branch circuit;
calculating to obtain branch electric quantity balance coefficients according to the trunk real-time electric quantity and the sum of the branch accumulated electric quantities of each branch circuit, calculating to obtain branch correction electric quantities of each branch circuit by using the branch electric quantity balance coefficients, and summarizing and summing all the branch correction electric quantities to obtain branch correction total electric quantity;
and when the difference value between the branch circuit corrected total electric quantity and the trunk circuit real-time electric quantity does not exceed a preset correction threshold, taking the branch circuit corrected electric quantity of each branch circuit as the metering electric quantity of each branch circuit and outputting the metering electric quantity.
Preferably, the method includes acquiring the real-time electric quantity of the trunk line according to a preset sampling frequency, and performing an increasing assignment on the accumulated sampling times after sampling is completed, and specifically includes the following steps:
setting electric quantity sampling frequency and setting the accumulated sampling times to zero;
and acquiring the real-time electric quantity of the trunk circuit by utilizing the total electric energy meter according to the electric quantity sampling frequency, and performing value addition and assignment on the accumulated sampling times after sampling is completed each time.
Preferably, the method includes acquiring the real-time electric quantity of the trunk line according to a preset sampling frequency, and performing an increment assignment on the accumulated sampling times after sampling is completed, and further includes the following steps:
and when the deviation proportion between the trunk circuit real-time electric quantities acquired in two consecutive times does not exceed a preset credibility threshold, determining that the trunk circuit real-time electric quantities acquired in the next acquisition are effective and executing subsequent flow operations in sequence.
Preferably, the obtaining of the branch real-time current value of each branch circuit and the calculating of the cumulative sampling times to obtain the branch cumulative electric quantity of each branch circuit specifically include the following steps:
respectively collecting the secondary side current value of each branch current transformer, calculating to obtain a corresponding branch real-time current value according to the secondary side current value, wherein the calculation formula is as follows,
wherein, I j Representing the branch real-time current value of the jth branch,
representing the secondary side current value of the jth branch, and N representing the current ratio of the branch current transformer of the jth branch;
calculating the branch accumulated electric quantity of the corresponding branch circuit according to the branch real-time current, wherein the calculation formula is as follows,
wherein the content of the first and second substances,
represents the branch accumulated electric quantity of the jth branch at the ith sampling time,
representing the voltage value of the jth branch at the ith sample,
and the current value of the branch of the jth branch in the ith sampling is represented, C represents the accumulated sampling frequency, f represents the electric quantity sampling frequency, and a represents a time unit conversion coefficient.
Preferably, the branch circuit electric quantity balance coefficient is calculated according to the sum of the trunk circuit real-time electric quantity and the branch circuit accumulated electric quantity of each branch circuit, the branch circuit correction electric quantity of each branch circuit is calculated by using the branch circuit electric quantity balance coefficient, and all the branch circuit correction electric quantities are summarized and summed to obtain the branch circuit correction total electric quantity, which specifically includes the following steps:
calculating to obtain branch circuit electric quantity balance coefficient according to the sum of the real-time electric quantity of the trunk circuit and the branch circuit accumulated electric quantity of each branch circuit, wherein the calculation formula is as follows,
wherein k is (i) Represents the branch circuit electric quantity balance coefficient at the ith sampling time, psi (i) Represents the real-time electric quantity of the trunk circuit at the ith sampling time,
the sum of the branch accumulated electric quantity of each branch circuit during the ith sampling is represented;
the branch circuit electric quantity balance coefficient is utilized to carry out electric quantity balance processing on the branch circuit accumulated electric quantity, branch circuit correction electric quantity of each branch circuit is respectively obtained by calculation, a calculation formula is as follows,
wherein the content of the first and second substances,
the branch correction electric quantity of the jth branch at the ith sampling is represented;
and summarizing all the branch correction electric quantities, and summing to obtain the branch correction total electric quantity.
Preferably, when the difference between the branch corrected total electric quantity and the trunk real-time electric quantity does not exceed a preset correction threshold, the branch corrected electric quantity of each branch circuit is used as the measured electric quantity of each branch circuit and is output, specifically including the following steps:
setting a correction threshold;
calculating the difference between the corrected total electric quantity of the branch circuit and the real-time electric quantity of the trunk circuit to obtain a corrected difference calculation result, comparing the corrected difference calculation result with the corrected threshold,
if the calculation result of the correction difference value does not exceed the correction threshold, the branch correction electric quantity of each branch circuit is used as the metering electric quantity of each branch circuit and is output,
and if the correction difference calculation result exceeds the correction threshold, performing data discarding processing on the branch correction electric quantity of each branch circuit at present, performing subtraction and assignment on the accumulated sampling times, acquiring the trunk real-time electric quantity again according to the preset electric quantity sampling frequency, and executing subsequent processes in sequence.
Preferably, the multi-branch power calibration method further includes the following steps:
and when the times that the calculation result of the correction difference value exceeds the correction threshold in a preset calibration period are larger than the preset fault-tolerant times, prompting that the operation is abnormal.
In a second aspect, the present application provides a multi-branch electric quantity calibration apparatus, which adopts the following technical scheme:
the utility model provides a many branches electric quantity calibrating device, with many branches charging system looks adaptations, many branches charging system is including setting up total electric energy meter on the trunk circuit and setting up the branch current transformer on each branch circuit, and the device includes following module:
the trunk circuit real-time electric quantity acquisition module is configured to acquire trunk circuit real-time electric quantity according to a preset electric quantity sampling frequency, and increase an assignment value for the accumulated sampling times after sampling is completed;
the branch accumulated electric quantity calculation module is configured to obtain branch real-time current values of all branch circuits and calculate branch accumulated electric quantities of all branch circuits by combining the accumulated sampling times;
the branch correction electric quantity calculation module is configured to calculate a branch electric quantity balance coefficient according to the sum of the trunk real-time electric quantity and the branch accumulated electric quantity of each branch circuit, calculate branch correction electric quantities of each branch circuit by using the branch electric quantity balance coefficient, and sum all the branch correction electric quantities to obtain branch correction total electric quantity;
and the corrected electric quantity verification output module is configured to output the branch corrected electric quantity of each branch circuit as the metering electric quantity of each branch circuit when the difference value between the branch corrected total electric quantity and the trunk real-time electric quantity does not exceed a preset correction threshold.
In a third aspect, the present application provides an intelligent terminal, which adopts the following technical solution:
an intelligent terminal comprising a memory and a processor, the memory having stored therein at least one instruction, at least one program, set of codes, or set of instructions, the at least one instruction, at least one program, set of codes, or set of instructions being loaded and executed by the processor to implement the multi-branch power calibration method as described above.
In a fourth aspect, the present application provides a readable storage medium, which adopts the following technical solutions:
the readable storage medium has stored therein at least one instruction, at least one program, set of codes, or set of instructions that is loaded and executed by a processor to implement the multi-branch power calibration method as described above.
The application has the advantages that:
according to the multi-branch electric quantity calibration method, the electric quantity of each branch circuit is corrected, so that a more accurate branch circuit metering result can be obtained on the premise of not independently arranging an electric energy meter. In the execution flow of the method, the data is verified and the reliability is monitored by setting a threshold value and a threshold limit, so that the accuracy of the finally output metering electric quantity is ensured, and a reliable basis is provided for the subsequent electric quantity charging.
Corresponding to the method, the multi-branch electric quantity calibration device, the intelligent terminal and the storage medium provide software and hardware support for realizing the electric quantity calibration method, automation and informatization of an electric quantity correction process of each branch circuit in a charging power supply circuit of the new energy automobile are realized, the accuracy of a metering result is guaranteed, meanwhile, the efficiency of the whole electric quantity correction process is improved, and manpower and material resources are saved.
In summary, the multi-branch electric quantity calibration method, the multi-branch electric quantity calibration device, the intelligent terminal and the storage medium provided by the application also provide reference for other electric quantity calibration schemes aiming at the multi-branch charging power supply system, so that technical personnel can expand, extend and deeply research on the basis of the electric quantity calibration schemes, and the schemes have very wide application prospects.
Drawings
Fig. 1 is a schematic diagram of a multi-branch charging system according to an embodiment of the present application.
Fig. 2 is a schematic flowchart of a multi-branch power calibration method according to an embodiment of the present disclosure.
Fig. 3 is a schematic diagram of an architecture of a multi-branch power calibration apparatus according to an embodiment of the present application.
Detailed Description
The application provides a multi-branch electric quantity calibration method, a multi-branch electric quantity calibration device, an intelligent terminal and a storage medium for a new energy automobile charging scene, and in order to make the purposes, technical schemes and advantages of the application clearer, the implementation mode of the application is further described in detail below.
Embodiments of a multi-branch power calibration method according to the present application are described in further detail below with reference to the drawings.
The multi-branch electric quantity calibration method is realized by depending on a multi-branch charging system, and the architecture of the multi-branch charging system is shown in fig. 1, and the multi-branch charging system comprises a total electric energy meter arranged on a main circuit (namely an incoming line circuit) and branch current transformers arranged on branch circuits. The total electric energy meter is responsible for metering the electricity consumption data of the whole system and is the basis for subsequently calibrating the electric quantity of each branch circuit. The incoming line circuit is divided into multiple power supplies after passing through the branch box, the electricity consumption of each branch circuit is independent, and in order to calculate the actual electricity consumption of each branch circuit, a branch current transformer is additionally arranged on each branch circuit of the system and used for collecting the current data of each branch circuit in real time.
As shown in fig. 2, the multi-branch power calibration method of the present application includes the following steps:
s1, acquiring the real-time electric quantity of the trunk line according to the preset electric quantity sampling frequency, and adding an assignment to the accumulated sampling times after sampling is completed; this step specifically includes the following flow.
And S11, setting an electric quantity sampling frequency and setting the accumulated sampling times to zero, wherein the electric quantity sampling frequency is recorded as f, the electric quantity sampling frequency is defined as the sampling times in 1 second, and the accumulated sampling times is recorded as C.
S12, acquiring real-time electric quantity of the trunk line by using an interface (usually an RS485 bus) of the total electric energy meter according to the electric quantity sampling frequency, wherein the real-time electric quantity of the trunk line is recorded as psi (i) And i represents the ith sampling, and an assignment is added to the accumulated sampling times after each sampling is finished.
S13, when the deviation proportion between the trunk circuit real-time electric quantities obtained by two continuous acquisitions does not exceed a preset credibility threshold, determining that the trunk circuit real-time electric quantity obtained by the next acquisition is effective, and executing subsequent flow operations in sequence; this step specifically includes the following flow.
S131, setting a reliability threshold which is essentially the maximum deviation ratio allowed between the trunk real-time electric quantities acquired by two continuous acquisitions, and recording the reliability threshold as C tv 。
S132, acquiring the trunk road real-time electric quantity acquired by two continuous acquisitions, calculating the deviation proportion between the trunk road real-time electric quantities acquired by two continuous acquisitions, wherein the calculation formula is as follows,
D p ＝|W rear end -W Firstly, use |/W Firstly, the first step is to ×100％，
Wherein D is p Representing the deviation proportion between the real-time electric quantities of the trunk circuit obtained by two continuous acquisitions, W Firstly, the first step is to Representing the real-time electric quantity, W, of the trunk line obtained by the previous acquisition Rear end And representing the real-time electric quantity of the trunk circuit acquired at the next time.
S133, comparing the deviation proportion between the trunk real-time electric quantities acquired in two consecutive times with the reliability threshold;
if the deviation proportion between the real-time electric quantities of the trunk circuit obtained by two continuous acquisitions does not exceed the reliability threshold, namely D p ≤C tv If the real-time electric quantity of the trunk circuit acquired at the next time is valid, the method flow is normally executed in sequence;
if the deviation proportion between the real-time electric quantities of the trunk circuit obtained by two continuous acquisitions exceeds the reliability threshold value, namely D p ＞C tv Then, the real-time electric quantity of the main road obtained by the previous collection is used as a reference value, the real-time electric quantity of the main road is continuously collected for a plurality of times (three times are selected in the embodiment), the deviation ratio between the real-time electric quantity of each main road and the reference value in the continuous collection for a plurality of times is respectively calculated, the calculation formula is as follows,
D pi ＝|W after i -W Firstly, use |/W Firstly, use ×100％，
Wherein D is pi Representing the deviation proportion between the real-time electric quantity of the trunk circuit and a reference value obtained by the ith acquisition in the continuous multiple acquisitions, W After i Representing the real-time electric quantity of the trunk circuit obtained by the ith acquisition in the continuous multiple acquisitions,
if the deviation proportion between the real-time electric quantity of each main road and the reference value in continuous multiple acquisition exceeds the reliability threshold value, namely D pi ＞C tv If not, performing data discarding processing on partial data of the trunk real-time electric quantity obtained by the last acquisition and the subsequent continuous multiple acquisitions, wherein the deviation proportion exceeds the reliability threshold, performing subtraction and assignment on the accumulated sampling times, returning to the step S11, and performing subsequent processes in sequence.
S2, obtaining branch real-time current values of each branch circuit, and calculating by combining the accumulated sampling times to obtain branch accumulated electric quantity of each branch circuit; this step specifically includes the following flow.
S21, collecting the secondary side current value of each branch current transformer, and calculating to obtain a corresponding branch real-time current value (i.e. primary side current value) according to the secondary side current value, where the calculation method is the same as that in the prior art, and the calculation formula is as follows,
wherein, I j Representing the branch real-time current value of the jth branch,
the secondary side current value of the jth branch is represented, and N represents the current ratio of the branch current transformer of the jth branch.
S22, calculating the branch circuit accumulated electric quantity of the corresponding branch circuit according to the branch real-time current, wherein the calculation formula is as follows,
wherein the content of the first and second substances,
represents the branch accumulated electric quantity of the jth branch at the ith sampling time,
representing the voltage value of the jth branch at the ith sample,
and the current value of the branch of the jth branch in the ith sampling is represented, C represents the accumulated sampling frequency, f represents the electric quantity sampling frequency, and a represents a time unit conversion coefficient.
It should be noted that the time unit conversion coefficient is mainly set to match an electric energy meter used by an electric power department in a real application scene, so as to achieve unification of measurement unit time, and in this embodiment, the time unit conversion coefficient a is 1/3600, which represents conversion from second data to time data.
S3, calculating to obtain branch electric quantity balance coefficients according to the sum of the trunk real-time electric quantity and the branch accumulated electric quantity of each branch circuit, calculating to obtain branch correction electric quantities of each branch circuit by using the branch electric quantity balance coefficients, and summarizing and summing all the branch correction electric quantities to obtain branch correction total electric quantity; this step specifically includes the following flow.
S31, calculating to obtain a branch circuit electric quantity balance coefficient according to the sum of the real-time electric quantity of the trunk circuit and the branch circuit accumulated electric quantity of each branch circuit, wherein the calculation formula is as follows,
wherein k is (i) Represents the branch circuit electric quantity balance coefficient at the ith sampling time, psi (i) Represents the real-time electric quantity of the trunk circuit at the ith sampling time,
and the sum of the branch accumulated electric quantity of each branch circuit at the ith sampling is represented.
S32, using the branch circuit electricity balance coefficient to carry out electricity balance processing on the branch circuit accumulated electricity, respectively calculating to obtain branch circuit correction electricity of each branch circuit, wherein the calculation formula is as follows,
wherein the content of the first and second substances,
and the branch correction electric quantity of the jth branch at the ith sampling is shown.
S33, collecting all the branch correction electric quantity, summing to obtain a branch correction total electric quantity, wherein the branch correction total electric quantityElectric quantity is recorded as
S4, when the difference between the branch circuit corrected total electric quantity and the main circuit real-time electric quantity does not exceed a preset correction threshold, taking the branch circuit corrected electric quantity of each branch circuit as the metering electric quantity of each branch circuit and outputting the metering electric quantity; this step specifically includes the following flow.
And S41, setting a correction threshold, wherein the correction threshold is generally set by taking the real-time electric quantity of the trunk as a reference, the lower limit is minus 0.5 percent of the real-time electric quantity of the trunk, the upper limit is plus 0.5 percent of the real-time electric quantity of the trunk, and the error range is controlled within 0.5 percent.
S42, calculating the difference between the branch circuit corrected total electric quantity and the trunk circuit real-time electric quantity to obtain a corrected difference calculation result, and comparing the corrected difference calculation result with the corrected threshold;
if the correction difference value calculation result does not exceed the correction threshold, the branch correction electric quantity of each branch circuit is used as the metering electric quantity of each branch circuit and is output, the branch correction electric quantity is used as the charging electric quantity and is used for charging, so that the sum of the branch electric quantities can be fully ensured to be equal to the total electric quantity meter charging value, and the metering error caused by line loss and insufficient precision of a current transformer is calibrated;
and if the correction difference calculation result exceeds the correction threshold, performing data discarding processing on the branch correction electric quantity of each branch circuit at present, performing subtraction and assignment on the accumulated sampling times, acquiring the trunk real-time electric quantity again according to the preset electric quantity sampling frequency, and executing subsequent processes in sequence.
The steps are mainly used for verifying whether the difference value between the total corrected electric quantity of the branch circuit and the real-time electric quantity of the trunk circuit is within an error allowable range or not so as to ensure the validity of the output result of the method. In addition to the above steps, in order to further improve the effectiveness and accuracy of the method of the present application, the multi-branch power calibration method of the present application further includes the following steps:
s5, when the number of times that the correction difference calculation result exceeds the correction threshold in a preset calibration period is larger than a preset fault-tolerant number, prompting abnormal operation; this step specifically includes the following flow.
S51, setting a calibration period, where the calibration period may be limited by unit time or sampling times, and the specific standard and value may be determined according to an actual scheme application scenario, and in this embodiment, every 100 times the accumulated sampling times rises may be taken as one calibration period.
S52, setting a fault tolerance number, where the fault tolerance number is mainly used to determine whether there is an error in the implementation process of the multi-branch electric quantity calibration method and the application process of the multi-branch charging system, and in this embodiment, the fault tolerance number may be set to 2.
S53, comparing the times that the calculation result of the corrected difference value exceeds the corrected threshold limit in the calibration period with the fault-tolerant times;
if the times of the correction difference calculation result exceeding the correction threshold in the calibration period do not exceed the fault-tolerant times, executing the method flow normally in sequence,
and if the times that the correction difference calculation result exceeds the correction threshold in the calibration period exceed the fault-tolerant times, prompting abnormal operation, and arranging subsequent system detection by operation and maintenance personnel of the multi-branch charging system.
By adopting the technical scheme, the electric quantity correction of each branch circuit in the charging power supply circuit of the new energy automobile is realized, so that a more accurate branch circuit metering result can be obtained on the premise of not independently arranging an electric energy meter, and the accuracy of subsequent charging is ensured.
In the execution flow of the multi-branch electric quantity calibration method, the data is verified and the reliability is monitored in a threshold value and threshold limit mode, the condition that errors between front and back data and between trunk circuit electric quantity data and branch electric quantity data are large in the implementation process of the method is avoided, and the accuracy of the finally output metering electric quantity is further guaranteed.
Based on the same inventive concept, the embodiment of the present application further discloses a multi-branch electric quantity calibration device, which is adapted to the multi-branch charging system, as shown in fig. 3, and includes the following modules:
the trunk circuit real-time electric quantity acquisition module is configured to acquire trunk circuit real-time electric quantity according to a preset electric quantity sampling frequency, and increase an assignment value for the accumulated sampling times after sampling is completed;
the branch accumulated electric quantity calculation module is configured to obtain branch real-time current values of all branch circuits and calculate branch accumulated electric quantities of all branch circuits by combining the accumulated sampling times;
the branch correction electric quantity calculation module is configured to calculate a branch electric quantity balance coefficient according to the sum of the trunk real-time electric quantity and the branch accumulated electric quantity of each branch circuit, calculate branch correction electric quantities of each branch circuit by using the branch electric quantity balance coefficient, and sum all the branch correction electric quantities to obtain branch correction total electric quantity;
and the corrected electric quantity verification output module is configured to use the branch corrected electric quantity of each branch circuit as the metering electric quantity of each branch circuit and output the metering electric quantity when the difference value between the branch corrected total electric quantity and the trunk circuit real-time electric quantity does not exceed a preset correction threshold.
In a specific possible implementation, the trunk real-time electric quantity acquisition module includes the following units:
the main circuit real-time electric quantity acquisition preparation unit is configured to set electric quantity sampling frequency and set the accumulated sampling times to zero;
and the trunk circuit real-time electric quantity acquisition execution unit is configured to acquire the trunk circuit real-time electric quantity by using the total electric energy meter according to the electric quantity sampling frequency, and increase an assignment value for the accumulated sampling times after sampling is completed each time.
In a specific implementation, the trunk real-time electric quantity acquisition module further includes the following units:
and the trunk circuit real-time electric quantity reliability checking unit is configured to determine that the trunk circuit real-time electric quantity acquired in the next acquisition is effective and execute subsequent flow operation in sequence when the deviation proportion between the trunk circuit real-time electric quantities acquired in two consecutive acquisitions does not exceed a preset reliability threshold.
In a specific possible implementation, the branch accumulated electric quantity calculating module includes the following units:
the branch accumulated electric quantity calculation first unit is configured to collect the secondary side current value of each branch current transformer respectively and calculate a corresponding branch real-time current value according to the secondary side current value;
and the branch circuit accumulated electric quantity calculation second unit is configured to calculate the corresponding branch circuit accumulated electric quantity of the branch circuit according to the branch real-time current.
In a specific possible implementation, the branch correction electric quantity calculation module includes the following units:
the branch circuit correction electric quantity calculation first unit is configured to calculate a branch circuit electric quantity balance coefficient according to the sum of the trunk circuit real-time electric quantity and the branch circuit accumulated electric quantity of each branch circuit;
the branch circuit correction electric quantity calculation second unit is configured to perform electric quantity balance processing on the branch circuit accumulated electric quantity by using the branch circuit electric quantity balance coefficient, and branch circuit correction electric quantities of all branch circuits are obtained through calculation respectively;
and the branch correction electric quantity calculation third unit is configured to sum all the branch correction electric quantities to obtain a branch correction total electric quantity.
In a specific possible implementation, the modified electric quantity verification output module includes the following units:
a modified power check output first unit configured to set a modified threshold;
a corrected electric quantity verification output second unit configured to calculate a difference between the branch corrected total electric quantity and the trunk real-time electric quantity to obtain a corrected difference calculation result, compare the corrected difference calculation result with the correction threshold,
if the calculation result of the correction difference value does not exceed the correction threshold, the branch correction electric quantity of each branch circuit is used as the metering electric quantity of each branch circuit and is output,
and if the correction difference calculation result exceeds the correction threshold, performing data discarding processing on the branch correction electric quantity of each branch circuit at present, performing subtraction and assignment on the accumulated sampling times, acquiring the trunk real-time electric quantity again according to the preset electric quantity sampling frequency, and executing subsequent processes in sequence.
In a specific possible embodiment, as shown in fig. 3, the multi-branch power calibration apparatus further includes the following modules:
and the correction result checking module is configured to prompt that the operation is abnormal when the number of times that the correction difference calculation result exceeds the correction threshold in a preset calibration period is greater than a preset fault-tolerant number of times.
By adopting the technical scheme, the automation and the informatization of the electric quantity correction process of each branch circuit in the charging power supply circuit of the new energy automobile are realized, the accuracy of the metering result is ensured, the efficiency of the whole electric quantity correction process is improved, and manpower and material resources are saved.
Based on the same inventive concept, the embodiment of the present application further discloses an intelligent terminal, which includes a memory and a processor, where the memory stores at least one instruction, at least one program, a code set, or an instruction set, and the at least one instruction, at least one program, a code set, or an instruction set is loaded and executed by the processor to implement the intelligent mailbox mailing method based on dynamic allocation as described above.
Also based on the same inventive concept, the present application further discloses a readable storage medium, in which at least one instruction, at least one program, a code set, or a set of instructions is stored, and the at least one instruction, the at least one program, the code set, or the set of instructions is loaded and executed by a processor to implement the multi-branch power calibration method as described above.
The readable storage medium may be a computer storage medium or a communication medium. Communication media includes any medium that facilitates transfer of a computer program from one place to another. Computer storage media may be any available media that can be accessed by a general purpose or special purpose computer. For example, a readable storage medium is coupled to the processor such that the processor can read information from, and write information to, the readable storage medium. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may reside in an Application Specific Integrated Circuits (ASIC). Additionally, the ASIC may reside in user equipment. Of course, the processor and the readable storage medium may also reside as discrete components in a communication device. The readable storage medium may be a read-only memory (ROM), a random-access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Finally, it should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should integrate the description, and the technical solutions in the embodiments can be appropriately combined to form other embodiments understood by those skilled in the art.
Claims (10)
1. A multi-branch electric quantity calibration method is matched with a multi-branch charging system, the multi-branch charging system comprises a total electric energy meter arranged on a trunk circuit and branch current transformers arranged on branch circuits, and the method is characterized by comprising the following steps:
acquiring real-time electric quantity of the trunk line according to a preset electric quantity sampling frequency, and adding an assignment to the accumulated sampling times after sampling is finished;
acquiring branch real-time current values of all branch circuits, and calculating by combining the accumulated sampling times to obtain the branch accumulated electric quantity of each branch circuit;
calculating to obtain branch electric quantity balance coefficients according to the trunk real-time electric quantity and the sum of the branch accumulated electric quantities of each branch circuit, calculating to obtain branch correction electric quantities of each branch circuit by using the branch electric quantity balance coefficients, and summarizing and summing all the branch correction electric quantities to obtain branch correction total electric quantity;
and when the difference value between the total corrected branch electric quantity and the real-time main circuit electric quantity does not exceed a preset correction threshold, taking the corrected branch electric quantity of each branch circuit as the metering electric quantity of each branch circuit and outputting the metering electric quantity.
2. The multi-branch power calibration method according to claim 1, wherein the trunk real-time power is acquired according to a preset sampling frequency, and an added value is assigned to the accumulated sampling times after sampling is completed, specifically comprising the following steps:
setting electric quantity sampling frequency and setting the accumulated sampling times to zero;
and acquiring the real-time electric quantity of the trunk line by utilizing the total electric energy meter according to the electric quantity sampling frequency, and performing value addition and assignment on the accumulated sampling times after sampling is completed each time.
3. The multi-branch power calibration method according to claim 2, wherein the trunk real-time power is acquired according to a preset sampling frequency, and an added value is assigned to the accumulated sampling times after the sampling is completed, further comprising the steps of:
and when the deviation proportion between the trunk real-time electric quantities acquired in two continuous times does not exceed a preset credibility threshold, determining that the trunk real-time electric quantities acquired in the next time are effective and executing subsequent flow operations in sequence.
4. The multi-branch power calibration method according to claim 2, wherein the step of obtaining the branch real-time current value of each branch circuit and calculating the branch accumulated power of each branch circuit by combining the accumulated sampling times includes the following steps:
respectively collecting the secondary side current value of each branch current transformer, calculating to obtain a corresponding branch real-time current value according to the secondary side current value, wherein the calculation formula is as follows,
wherein, I j Representing the branch real-time current value of the jth branch,
representing the secondary side current value of the jth branch, and N representing the current ratio of the branch current transformer of the jth branch;
calculating the branch accumulated electric quantity of the corresponding branch circuit according to the branch real-time current, wherein the calculation formula is as follows,
wherein the content of the first and second substances,
represents the branch accumulated electric quantity of the jth branch at the ith sampling time,
representing the voltage value of the jth branch at the ith sample,
and the current value of the branch of the jth branch in the ith sampling is represented, C represents the accumulated sampling frequency, f represents the electric quantity sampling frequency, and a represents a time unit conversion coefficient.
5. The method according to claim 4, wherein the method comprises the steps of calculating a branch circuit electricity balance coefficient according to a sum of the trunk circuit real-time electricity and the branch circuit accumulated electricity of each branch circuit, calculating branch circuit corrected electricity of each branch circuit by using the branch circuit electricity balance coefficient, and summing all the branch circuit corrected electricity to obtain a branch circuit corrected total electricity, and specifically comprises the following steps:
calculating to obtain branch circuit electric quantity balance coefficient according to the sum of the real-time electric quantity of the trunk circuit and the branch circuit accumulated electric quantity of each branch circuit, wherein the calculation formula is as follows,
wherein k is (i) Represents the branch circuit electric quantity balance coefficient at the ith sampling time, psi (i) Represents the real-time electric quantity of the trunk circuit at the ith sampling time,
the sum of the branch accumulated electric quantity of each branch circuit during the ith sampling is represented;
the branch circuit electric quantity balance coefficient is utilized to carry out electric quantity balance processing on the branch circuit accumulated electric quantity, branch circuit correction electric quantity of each branch circuit is respectively obtained by calculation, a calculation formula is as follows,
wherein the content of the first and second substances,
the branch correction electric quantity of the jth branch at the ith sampling is represented;
and summarizing all the branch correction electric quantities, and summing to obtain the branch correction total electric quantity.
6. The multi-branch power calibration method according to claim 5, wherein when the difference between the branch corrected total power and the trunk real-time power does not exceed a preset correction threshold, the branch corrected power of each branch circuit is used as the measured power of each branch circuit and output, and the method specifically comprises the following steps:
setting a correction threshold;
calculating the difference between the corrected total electric quantity of the branch circuit and the real-time electric quantity of the trunk circuit to obtain a corrected difference calculation result, comparing the corrected difference calculation result with the corrected threshold limit,
if the calculation result of the correction difference value does not exceed the correction threshold, the branch correction electric quantity of each branch circuit is used as the metering electric quantity of each branch circuit and is output,
and if the correction difference calculation result exceeds the correction threshold, performing data discarding processing on the branch correction electric quantity of each branch circuit at present, performing subtraction and assignment on the accumulated sampling times, acquiring the trunk real-time electric quantity again according to the preset electric quantity sampling frequency, and executing subsequent processes in sequence.
7. The multi-branch power calibration method of claim 6, further comprising the steps of:
and when the times that the calculation result of the correction difference value exceeds the correction threshold in a preset calibration period are larger than the preset fault-tolerant times, prompting that the operation is abnormal.
8. The utility model provides a many branches electric quantity calibrating device, with many branches charging system looks adaptation, many branches charging system is including setting up total electric energy meter on the trunk circuit and setting up the branch current transformer on each branch circuit, its characterized in that, the device includes following module:
the trunk circuit real-time electric quantity acquisition module is configured to acquire trunk circuit real-time electric quantity according to a preset electric quantity sampling frequency, and increase an assignment value for the accumulated sampling times after sampling is completed;
the branch accumulated electric quantity calculation module is configured to obtain branch real-time current values of all branch circuits and calculate the branch accumulated electric quantity of all branch circuits by combining the accumulated sampling times;
the branch correction electric quantity calculation module is configured to calculate a branch electric quantity balance coefficient according to the sum of the trunk real-time electric quantity and the branch accumulated electric quantity of each branch circuit, calculate branch correction electric quantities of each branch circuit by using the branch electric quantity balance coefficient, and sum all the branch correction electric quantities to obtain branch correction total electric quantity;
and the corrected electric quantity verification output module is configured to use the branch corrected electric quantity of each branch circuit as the metering electric quantity of each branch circuit and output the metering electric quantity when the difference value between the branch corrected total electric quantity and the trunk circuit real-time electric quantity does not exceed a preset correction threshold.
9. An intelligent terminal, comprising a memory and a processor, wherein the memory has stored therein at least one instruction, at least one program, set of codes, or set of instructions, which is loaded and executed by the processor to implement the multi-branch power calibration method according to any one of claims 1 to 7.
10. A readable storage medium having stored therein at least one instruction, at least one program, set of codes, or set of instructions, which is loaded and executed by a processor to implement the multi-branch power calibration method according to any one of claims 1 to 7.
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