CN115308477A - Method, device, medium and equipment for judging reverse direction of power reverse transmission power flow - Google Patents

Method, device, medium and equipment for judging reverse direction of power reverse transmission power flow Download PDF

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Publication number
CN115308477A
CN115308477A CN202211040954.6A CN202211040954A CN115308477A CN 115308477 A CN115308477 A CN 115308477A CN 202211040954 A CN202211040954 A CN 202211040954A CN 115308477 A CN115308477 A CN 115308477A
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power
total
determining
determination result
electric energy
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Inventor
常仕亮
成涛
徐鸿宇
何珉
郑可
赵翊丞
任敏
青志明
牟攀
冯凌
杜杰
张家铭
古海林
颜从国
胡建明
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State Grid Chongqing Electric Power Co Marketing Service Center
State Grid Corp of China SGCC
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State Grid Chongqing Electric Power Co Marketing Service Center
State Grid Corp of China SGCC
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Priority to CN202211040954.6A priority Critical patent/CN115308477A/en
Publication of CN115308477A publication Critical patent/CN115308477A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/14—Indicating direction of current; Indicating polarity of voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/001—Measuring real or reactive component; Measuring apparent energy
    • G01R21/002—Measuring real component
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/001—Measuring real or reactive component; Measuring apparent energy
    • G01R21/003—Measuring reactive component
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/006—Measuring power factor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
    • G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current

Abstract

The application discloses a method, a device, a medium and equipment for judging reverse power reverse transmission flow direction, wherein the method comprises the following steps: acquiring operation data of the intelligent electric energy meter; determining a first judgment result according to the total active power in the operation data; determining a second determination result according to the total reactive power in the operation data and the operation quadrant in the operation data; determining a third decision result based on the total power factor in the operational data; determining a fourth judgment result according to the ratio of the element power factor to the total power factor in the operation data; and if at least one of the first determination result, the second determination result and the third determination result is not satisfied, and the fourth determination result is not satisfied, determining that the intelligent electric energy meter is in a power reverse transmission state. The method reduces the safety risk and the test cost in the judgment process, and meanwhile improves the judgment accuracy.

Description

Method, device, medium and equipment for judging reverse direction of power reverse transmission power flow
Technical Field
The present application relates to the field of power grid operation and maintenance technologies, and in particular, to a method and an apparatus for determining a reverse power flow in a reverse power transmission, a storage medium, and an electronic device.
Background
In an electric power system, a power flow is a power transmission direction represented by a current. The reverse direction of the power flow refers to a phenomenon that the direction of the power flow is opposite to the normal power transmission direction, which can cause a fault of a power system, for example, the voltage and the current of each node of a power grid are influenced, the power supply quality of some nodes can not reach the standard, and even system accidents and power grid cracking are caused.
The existing method for judging the reverse trend needs a worker to perform wiring operation on a live metering loop on site, and tests such as a phase volt-ampere meter, a three-phase electric energy meter site inspection instrument, an electricity utilization tester, a pincerlike multimeter and the like are used for testing data such as voltage, current, phase and the like at an electric energy meter terminal box, so that the reverse trend of the intelligent electric energy meter is judged, the safety risk is high, the cost of the test instrument is high, and in addition, the judgment result is influenced by the professional skill level of the worker, so the accuracy cannot be ensured.
Disclosure of Invention
In view of this, the present application provides a method and an apparatus for determining reverse power flow in reverse power transmission, a storage medium, and an electronic device, which are used for determining reverse power flow in the reverse power transmission situation, so as to reduce the safety risk and the testing cost in the determination process, and improve the determination accuracy.
According to an aspect of the present application, there is provided a method for determining a reverse direction of a power reverse transmission power flow, including:
acquiring operation data of the intelligent electric energy meter;
determining a first judgment result according to the total active power in the operation data;
determining a second determination result according to the total reactive power in the operation data and the operation quadrant in the operation data;
determining a third determination result according to the total power factor in the operation data;
determining a fourth judgment result according to the ratio of the element power factor to the total power factor in the operation data;
and if at least one of the first determination result, the second determination result and the third determination result is not satisfied, and a fourth determination result is not satisfied, determining that the intelligent electric energy meter is in a reverse power transmission state.
Optionally, the determining a first determination result according to the total active power in the operation data specifically includes:
if the total active power is less than 0, the first judgment result is satisfied;
and if the total active power is greater than or equal to 0, the first judgment result is unsatisfied.
Optionally, the determining a second determination result according to the total reactive power in the operating data and the operating quadrant in the operating data specifically includes:
if the operating quadrant is a second quadrant and the total reactive power is greater than 0, the second determination result is satisfied;
if the operating quadrant is a third quadrant and the total reactive power is less than 0, the second determination result is satisfied;
otherwise, the second determination result is unsatisfied.
Optionally, the determining a third determination result according to the total power factor in the operation data specifically includes:
if the total power factor is less than 0, the third determination result is satisfied;
if the total power factor is greater than 0 or equal to 0, the third determination result is unsatisfied.
Optionally, the determining a fourth determination result according to a ratio of the element power factor to the total power factor in the operation data specifically includes:
judging the type of the intelligent electric energy meter, and determining the number of metering elements in the intelligent electric energy meter according to the type;
accumulating the element power factors of each metering element according to the number of the metering elements to obtain a sum of the element power factors, and calculating the ratio of the sum to the total power factor;
if the difference between the ratio and a preset target ratio is smaller than a first preset threshold, the fourth judgment result is satisfied;
and if the difference value between the ratio and a preset target ratio is greater than or equal to the first preset threshold value, the fourth judgment result is unsatisfied.
Optionally, before determining the first determination result according to the total active power in the operation data, the method further includes:
acquiring a line voltage value and a line current value by using the intelligent electric energy meter;
and if the difference value between at least one line voltage value and the rated voltage value is larger than a second preset threshold value, or at least one line current value is smaller than a third preset threshold value, stopping the judgment.
Optionally, after determining that the intelligent electric energy meter is in a reverse power transmission state, the method further includes:
and generating alarm information and pushing the alarm information to a monitoring terminal.
According to another aspect of the present application, there is provided a device for determining a reverse direction of a power reverse transmission power flow, including:
the intelligent electric energy meter comprises an acquisition module, a storage module and a control module, wherein the acquisition module is used for acquiring intelligent electric energy meter data, and the intelligent electric energy meter data comprise total active power, total reactive power, element power factors and total power factors;
the first judgment module is used for determining a first judgment result according to the total active power in the operation data;
the second judgment module is used for determining a second judgment result according to the total reactive power in the operation data and the operation quadrant in the operation data;
the third judgment module is used for determining a third judgment result according to the total power factor in the operation data;
the fourth judging module is used for determining a fourth judging result according to the ratio of the element power factor to the total power factor in the operation data;
and the analysis module is used for judging that the intelligent electric energy meter is in a power reverse transmission state if at least one of the first judgment result, the second judgment result and the third judgment result is not satisfied and the fourth judgment result is not satisfied.
Optionally, the first determining module is specifically configured to:
if the total active power is less than 0, the first judgment result is satisfied;
and if the total active power is greater than or equal to 0, the first judgment result is unsatisfied.
Optionally, the second determining module is specifically configured to:
if the operating quadrant is a second quadrant and the total reactive power is greater than 0, the second determination result is satisfied;
if the operating quadrant is a third quadrant and the total reactive power is less than 0, the second determination result is satisfied;
otherwise, the second determination result is unsatisfied.
Optionally, the third determining module is specifically configured to:
if the total power factor is less than 0, the third determination result is satisfied;
if the total power factor is greater than 0 or equal to 0, the third determination result is unsatisfied.
Optionally, the fourth determining module is specifically configured to:
judging the type of the intelligent electric energy meter, and determining the number of metering elements in the intelligent electric energy meter according to the type;
accumulating the element power factors of each metering element according to the number of the metering elements to obtain a sum value of the element power factors, and calculating a ratio of the sum value to the total power factor;
if the difference between the ratio and a preset target ratio is smaller than a first preset threshold, the fourth judgment result is satisfied;
and if the difference value between the ratio and a preset target ratio is greater than or equal to the first preset threshold value, the fourth judgment result is unsatisfied.
Optionally, the apparatus further includes a prior module, specifically configured to:
acquiring a line voltage value and a line current value by using the intelligent electric energy meter;
and if the difference value between at least one line voltage value and the rated voltage value is larger than a second preset threshold value, or at least one line current value is smaller than a third preset threshold value, stopping the judgment.
Optionally, the apparatus further includes an alarm module, specifically configured to:
and generating alarm information and pushing the alarm information to a monitoring terminal.
According to yet another aspect of the present application, there is provided a storage medium having a computer program stored thereon, the program or instructions being executed by a processor to implement the above-mentioned method for determining a power flow reversal.
According to still another aspect of the present application, there is provided an electronic device, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor implements the method for determining the power flow reversal when executing the computer program.
By means of the technical scheme, the method and the device consider a plurality of different data of the intelligent electric energy meter through four judgment conditions, comprehensively analyze the first judgment result, the second judgment result, the third judgment result and the fourth judgment result, and realize the reverse study and judgment of the power flow under the condition of reverse power transmission according to the four results. The method has the advantages that the wiring operation of personnel such as metering, meter installation, power connection, electricity utilization inspection and the like on the electrified metering loop is not needed, safety accidents such as large-area power failure and the like caused by personal electric shock, voltage loop short circuit, open circuit of a secondary loop of a current transformer, burning of metering equipment and tripping of a breaker can be avoided, and zero risk of safety accidents such as personal electric shock injury, equipment damage, power grid accidents and the like is realized. Meanwhile, the test is not carried out through instruments and meters, and the limitation of the skill levels of personnel such as metering, meter installation, power connection, power utilization inspection and the like is avoided. The method is quick, simple and convenient, and can quickly and accurately judge whether the intelligent electric energy meter has the reversed trend or not according to the rule and the logic relation presented by the power supply line or the electricity user in different inductive and capacitive load characteristics through the metering core data such as the power factor of the intelligent electric energy meter.
The above description is only an overview of the technical solutions of the present application, and the present application may be implemented in accordance with the content of the description so as to make the technical means of the present application more clearly understood, and the detailed description of the present application will be given below in order to make the above and other objects, features, and advantages of the present application more clearly understood.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic flowchart illustrating a method for determining a reverse power flow in a reverse power transmission system according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart of another method for determining reverse power flow in reverse power transmission provided in an embodiment of the present application;
fig. 3 is a schematic flow chart of another method for determining reverse power flow in reverse power transmission provided in an embodiment of the present application;
fig. 4 is a schematic flowchart illustrating another method for determining a reverse power flow in a reverse power transmission system according to an embodiment of the present application;
fig. 5 is a schematic flow chart illustrating another method for determining reverse power flow in reverse power transmission according to an embodiment of the present application;
fig. 6 shows a block diagram of a device for determining reverse power flow in reverse power reverse transmission according to an embodiment of the present application.
Detailed Description
The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict.
In this embodiment, a method for determining a power reversal of a reverse transmission power flow is provided, as shown in fig. 1, the method includes:
step 101, acquiring operation data of an intelligent electric energy meter;
the method for judging the power flow reversal provided by the embodiment of the application is used for judging whether the power flow reversal phenomenon occurs under the condition of power reversal transmission. Specifically, the method for judging the trend reversal through the test instrument is different from the existing test instruments such as a field external connection phase volt-ampere meter, a three-phase electric energy meter field tester, a power utilization tester and a pincerlike multimeter, and the judgment result can be obtained through analysis only through data displayed by the intelligent electric energy meter.
Based on the method, before judgment, the operation data of the intelligent electric energy meter is firstly acquired. Specifically, the operation data can be obtained by indicating numbers displayed on an intelligent electric energy meter, and the intelligent electric energy meter has the functions of measuring the voltage, the current, the power factor, the active power and the reactive power of each element, and measuring the voltage phase sequence, the total active power, the total reactive power, the total power factor, the forward and reverse active electric quantity, the four-quadrant reactive electric quantity and the like.
Step 102, determining a first judgment result according to the total active power in the operation data;
103, determining a second determination result according to the total reactive power in the operation data and the operation quadrant in the operation data;
104, determining a third judgment result according to the total power factor in the operation data;
step 105, determining a fourth judgment result according to the ratio of the element power factor to the total power factor in the operation data;
in this embodiment, four different judgment conditions are set. Each judgment condition corresponds to a judgment result. The first determination result depends on the total active power, and specifically may be a direction of the total active power; the second determination result depends on the total reactive power and the operation quadrant, wherein the total reactive power can be positive or negative of the total reactive power; the third judgment result depends on the total power factor, and specifically can be positive or negative of the total power factor; the fourth determination result depends on the ratio of the element power factors to the total power factor, and may be specifically the ratio of the sum of the element power factors to the total power factor. The embodiment comprehensively considers four judgment conditions, analyzes the characteristics of reverse power transmission from different angles, and ensures the accuracy of the judgment result.
And 106, if at least one of the first determination result, the second determination result and the third determination result is not satisfied, and the fourth determination result is not satisfied, determining that the intelligent electric energy meter is in a reverse power transmission state.
In this embodiment, the first determination result, the second determination result, the third determination result, and the fourth determination result are comprehensively analyzed, and if all of the four results are satisfied, it may be determined that the power flow is not reversed; and if at least one of the first determination result, the second determination result and the third determination result is not satisfied, and the fourth determination result is not satisfied, determining that the power flow is reversed.
By applying the technical scheme of the embodiment, the data displayed by the intelligent electric energy meter is utilized to study and judge the reversed trend under the condition of reverse power transmission, a detection instrument is connected without manual wiring of a worker, safety accidents possibly occurring in the wiring process are avoided, the judgment speed is greatly increased, further, an analysis result is obtained through data calculation, a method for the worker to analyze the data of the detection instrument according to the work experience is abandoned, and the judgment accuracy is ensured. In addition, the embodiment of the application comprehensively considers four different judgment conditions by analyzing data such as total active power, total reactive power and the like, and judges that no trend reversal occurs only when four judgment results are all satisfied, so that the judgment process is rigorous, and the possibility of misjudgment is reduced.
Further, as a refinement and an extension of the specific implementation of the foregoing embodiment, in order to fully describe the specific implementation process of this embodiment, another method for determining a reverse direction of a power reverse transmission power flow is provided, as shown in fig. 2, the determining a first determination result according to the total active power in the operating data specifically includes:
step 201, if the total active power is less than 0, the first determination result is satisfied;
in step 202, if the total active power is greater than or equal to 0, the first determination result is unsatisfied.
In this embodiment, if the power flow is reversed, the total power measured by the intelligent electric energy meter is opposite to the primary power transmission direction. If the total active power is less than 0, the direction of the active power is negative, the active power is counted in the opposite direction of the intelligent electric energy meter, and the characteristic of the power flow direction during power reverse transmission is met, so that the first judgment result is satisfied; on the contrary, if the total active power is greater than or equal to 0, the active power direction is positive or no energy consumption, the active electric quantity is counted into the positive direction of the intelligent electric energy meter, and therefore the first determination result is unsatisfied.
Further, as shown in fig. 3, in another method for determining a reverse power flow in a reverse power transmission process, determining a second determination result according to a total reactive power in the operating data and an operating quadrant in the operating data specifically includes:
step 301, if the operating quadrant is a second quadrant and the total reactive power is greater than 0, a second determination result is satisfied;
step 302, if the operation quadrant is a third quadrant and the total reactive power is less than 0, the second determination result is satisfied;
step 303, otherwise, the second determination result is not satisfied.
In this embodiment, if the power is transmitted reversely, under a normal condition, the reactive power is counted in quadrant ii or quadrant iii, specifically, if the operation quadrant is the second quadrant, that is, the reverse capacitive load, the rule presented by the reverse capacitive load is that the total reactive power is greater than 0; if the operating quadrant is the third quadrant, that is, the reverse sensing, the rule presented by the reverse sensing load is that the total reactive power is less than 0. Based on the above, if the data of the intelligent electric energy meter meets one of the above conditions, the total reactive power can be considered to meet the characteristic of reverse power transmission, and the second judgment result is that the total reactive power meets the requirement; if the two conditions are not met, the power flow reversal is considered to occur.
The embodiment considers the operation quadrant, analyzes whether the intelligent electric energy meter is in an inductive or capacitive state according to the operation quadrant, and further analyzes whether the total reactive power meets the characteristics of the reverse power transmission under the normal condition or not according to the rule of inductive or capacitive load.
Further, as shown in fig. 4, in another method for determining a reverse power flow in reverse power transmission, determining a third determination result according to a total power factor in the operating data specifically includes:
step 401, if the total power factor is less than 0, the third determination result is satisfied;
in step 402, if the total power factor is greater than 0 or equal to 0, the third determination result is unsatisfied.
In this embodiment, the total power factor cos Φ is the ratio of the total active power P to the apparent power S, and since the apparent power S is always positive, the positive and negative of the total power factor follows the total active power P. Specifically, if the power is transmitted reversely, under a normal condition, if the power is transmitted reversely, the total active power direction is negative, and therefore the total power factor is also smaller than 0, and therefore, the third determination result is satisfied when the total power factor is smaller than 0; correspondingly, if the total power factor is greater than 0 or equal to 0, the total active power direction can be considered as positive, which does not conform to the characteristic of the power flow direction during power reverse transmission, and therefore the third determination result is not satisfied.
The embodiment considers the positive and negative characteristics of the total power factor under the condition of power reverse transmission, and provides a basis for judging the power flow reversal during the power reverse transmission according to the characteristics, so that the judgment result is more accurate.
Further, as shown in fig. 5, in another method for determining a reverse power flow in reverse power transmission, determining a fourth determination result according to a ratio of element power factors to total power factors in the operation data specifically includes:
step 501, judging the type of the intelligent electric energy meter, and determining the number of metering elements in the intelligent electric energy meter according to the type;
step 502, accumulating the element power factors of each metering element according to the number of the metering elements to obtain a sum of the element power factors, and calculating a ratio of the sum to the total power factor;
step 503, if the difference between the ratio and the preset target ratio is smaller than the first preset threshold, the fourth determination result is satisfied;
in step 504, if the difference between the ratio and the preset target ratio is greater than or equal to the first preset threshold, the fourth determination result is unsatisfied.
In this embodiment, different types of intelligent electric energy meters have different numbers of metering elements inside, so the sum of the power factors of the metering elements can be calculated according to the numbers of the metering elements. For example, the three-phase three-wire intelligent electric energy meter is internally provided with two metering elements, and the sum value of the two metering elements is the sum of the power factors of the two metering elements
Figure BDA0003820854940000101
Figure BDA0003820854940000102
Three metering elements are arranged in the three-phase four-wire intelligent electric energy meter, and the sum value of the three metering elements is the sum of the power factors of the three metering elements
Figure BDA0003820854940000103
In view of
Figure BDA0003820854940000104
And
Figure BDA0003820854940000105
and
Figure BDA0003820854940000106
the relationship between the power factor and the total power factor of each element may also be considered to be a correlation, specifically, if the ratio between the sum and the total power factor is smaller than a first preset threshold, the ratio may be considered to be about fixed to the first preset threshold, at this time, the fourth determination condition is satisfied, otherwise, the fourth determination condition is not satisfied.
Further, if the type of the intelligent electric energy meter is a three-phase three-wire intelligent electric energy meter, the first preset threshold may be
Figure BDA0003820854940000107
If the type of the intelligent electric energy meter is a three-phase four-wire intelligent electric energy meter, the first preset threshold value may be 3.
That is, if the type of the intelligent electric energy meter is a three-phase three-wire intelligent electric energy meter, under ideal conditions,
Figure BDA0003820854940000108
Figure BDA0003820854940000109
the determination condition for the magnitude of the power factor at this time may be set to
Figure BDA00038208549400001010
Figure BDA00038208549400001011
If the type of the intelligent electric energy meter is a three-phase four-wire intelligent electric energy meter, under the ideal condition,
Figure BDA00038208549400001012
Figure BDA00038208549400001013
the judgment condition at this time may be set to
Figure BDA00038208549400001014
In the embodiment, the relation between the element power factor and the total power factor is considered, the fourth judgment condition is set, and whether the power flow is reversed or not is comprehensively analyzed by using the four judgment results, so that the judgment accuracy is improved.
Further, in another method for determining a reverse power flow in a reverse power transmission process, before determining a first determination result according to the total active power in the operating data, the method further includes:
601, acquiring a line voltage value and a line current value by using an intelligent electric energy meter;
step 602, if the difference between at least one line voltage value and the rated voltage value is greater than a second preset threshold, or at least one line current value is less than a third preset threshold, the judgment is stopped.
In this embodiment, if the voltage or current is too low, other faults may occur, at which point a false determination may occur for the power flow reversal. Therefore, before determining whether the power flow reversal occurs, whether the voltage value and the current value meet the requirements or not can be analyzed.
In particular, three sets of line voltages may be analyzed in relation to a nominal voltage value, wherein the nominal voltage value is the nominal line voltage value. And if the difference between the line voltage and the rated voltage value is larger than a second preset threshold value, the difference between the line voltage and the rated voltage value is considered to be overlarge, and the judgment of the power flow reversal is stopped under the condition.
If the line current value is smaller than the third preset threshold, the amplitude of the line current is considered to be too small, the judgment accuracy degree is influenced, and the judgment of the power flow reversal is stopped under the condition. Wherein the third preset threshold may be 0.75 ampere.
Furthermore, the phase voltages and the phase currents may be analyzed, and if at least one of the phase voltages has a too large difference from the rated phase voltage value or at least one of the phase current values has a too small difference, the determination is also stopped.
Further, as shown, in another method for determining reverse power flow in reverse power transmission, after determining that the intelligent electric energy meter is in a reverse power transmission state, the method further includes:
and generating alarm information and pushing the alarm information to the monitoring terminal.
In this embodiment, if it is determined that the smart electric energy meter power flow is reversed, it can be known that the grid system may be affected or even failed. Therefore, alarm information can be generated and sent to the monitoring terminal, so that workers can timely know and process the problem of reversed tide.
Specifically, the alarm information may contain metering data used in the determination process, such as total active power, reactive power, element power factor, total power factor, and the like, so that a worker can more quickly confirm the cause of the fault. In addition, an audible and visual alarm mode can be adopted, and the working personnel can be prompted to process the fault through prompting sound or alarming light.
Further, in another method for determining reverse power reverse transmission power flow, the specific determination process is as follows:
when power is transmitted reversely, the total power factor of the intelligent electric energy meter is a negative value, the total active power is a negative value, and the total reactive power can be a positive value or a negative value.
If the intelligent electric energy meter is a three-phase three-wire intelligent electric energy meter, the three groups of line voltages U are connected 12 、U 32 、U 13 Close to the rated value of 100V, two sets of element currents I 1 、I 2 And under the condition of a certain amplitude (generally 0.075A or above), judging the flow reversal.
If the intelligent electric energy meter operates in the second quadrant capacitive state, if the intelligent electric energy meter simultaneously satisfies the following four conditions: power factor of each element
Figure BDA0003820854940000121
To the total power factor
Figure BDA0003820854940000122
Satisfy the relationship therebetween
Figure BDA0003820854940000123
And is
Figure BDA0003820854940000124
Total active power P<0. Total reactive power Q>And 0, the power flow is not reversed, the first term in the four conditions is not satisfied, and any one of the second term, the third term and the fourth term is not satisfied, and the power flow is reversed.
If the intelligent electric energy meter operates in the third quadrant inductive state, if the intelligent electric energy meter simultaneously meets the following four conditions: power factor of each element
Figure BDA0003820854940000125
To the total power factor
Figure BDA0003820854940000126
Satisfy the relationship between
Figure BDA0003820854940000127
And is
Figure BDA0003820854940000128
Total active power P<0. Total reactive power Q<And 0, the power flow is not reversed, the first term in the four conditions is not satisfied, and any one of the second term, the third term and the fourth term is not satisfied, and the power flow is reversed.
If the intelligent electric energy meter is a three-phase four-wire intelligent electric energy meter, three groups of phase voltages U are applied 1 、U 2 、U 3 Three groups of element currents I close to rated value of 57.7V or 220V 1 、I 2 、I 3 And under the condition of a certain amplitude (generally 0.075A or above), judging the flow reversal.
If the intelligent electric energy meter operates in the third quadrant inductive state, if the intelligent electric energy meter simultaneously meets the following four conditions: power factor of each element
Figure BDA0003820854940000131
To the total power factor
Figure BDA0003820854940000132
Satisfy the relationship between
Figure BDA0003820854940000133
And is
Figure BDA0003820854940000134
Total active power P<0. Total reactive power Q<And 0, the power flow is not reversed, the first term in the four conditions is not satisfied, and any one of the second term, the third term and the fourth term is not satisfied, and the power flow is reversed.
According to the embodiment, the power factor of each element is comprehensively analyzed by using data obtained by measuring the intelligent electric energy meter according to the rule and the logic relation presented by different inductive and capacitive load characteristics
Figure BDA0003820854940000135
To the total power factor
Figure BDA0003820854940000136
The relation among the intelligent electric energy meter and the intelligent electric energy meter, the total power factor, the total active power, the direction of the total reactive power and the like, and the accurate judgment of the intelligent electric energy meter on the reverse trend is realized. Manual operation is reduced, judgment is rapid and accurate, and meanwhile cost is low.
Further, as a specific implementation of the method for determining reverse power flow in reverse power reverse transmission, an embodiment of the present application provides a device for determining reverse power flow in reverse power reverse transmission, as shown in fig. 6, where the device for determining reverse power flow includes: the device comprises an acquisition module, a first judgment module, a second judgment module, a third judgment module, a fourth judgment module and an analysis module.
The acquisition module is used for acquiring data of the intelligent electric energy meter;
the first judgment module is used for determining a first judgment result according to the total active power in the operation data;
the second judgment module is used for determining a second judgment result according to the total reactive power in the operation data and the operation quadrant in the operation data;
the third judgment module is used for determining a third judgment result according to the total power factor in the operation data;
the fourth judgment module is used for determining a fourth judgment result according to the ratio of the element power factor to the total power factor in the operation data;
and the analysis module is used for judging that the intelligent electric energy meter is in a power reverse transmission state if at least one of the first judgment result, the second judgment result and the third judgment result is not satisfied, and the fourth judgment result is not satisfied.
Optionally, the first determining module is specifically configured to:
if the total active power is less than 0, the first judgment result is satisfied;
and if the total active power is greater than 0 or equal to 0, the first judgment result is unsatisfied.
Optionally, the second determining module is specifically configured to:
if the operation quadrant is a second quadrant and the total reactive power is greater than 0, the second judgment result is satisfied;
if the operation quadrant is a third quadrant and the total reactive power is less than 0, the second judgment result is satisfied;
otherwise, the second determination result is unsatisfied.
Optionally, the third determining module is specifically configured to:
if the total power factor is less than 0, the third judgment result is satisfied;
if the total power factor is greater than 0 or equal to 0, the third determination result is unsatisfied.
Optionally, the fourth determining module is specifically configured to:
judging the type of the intelligent electric energy meter, and determining the number of metering elements in the intelligent electric energy meter according to the type;
accumulating the element power factors of each metering element according to the number of the metering elements to obtain a sum of the element power factors, and calculating a ratio of the sum to the total power factor;
if the difference value between the ratio and the preset target ratio is smaller than the first preset threshold value, the fourth judgment result is satisfied;
and if the difference value between the ratio and the preset target ratio is greater than or equal to the first preset threshold value, the fourth judgment result is unsatisfied.
Optionally, the apparatus further comprises an apriori module, specifically configured to:
acquiring a line voltage value and a line current value by using an intelligent electric energy meter;
and if the difference value between the at least one line voltage value and the rated voltage value is larger than a second preset threshold value, or the at least one line current value is smaller than a third preset threshold value, stopping the judgment.
Optionally, the apparatus further comprises an alarm module, specifically configured to:
and generating alarm information and pushing the alarm information to a monitoring terminal.
According to yet another aspect of the present application, there is provided a storage medium on which a computer program is stored, the program or instructions when executed by a processor implementing the above-mentioned method for determining power reverse transmission flow reversal.
According to still another aspect of the present application, there is provided an electronic device, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, where the processor executes the computer program to implement the method for determining reverse of power reverse transmission power flow.
It should be noted that other corresponding descriptions of the functional modules related to the determining apparatus for reverse power transmission power flow provided in the embodiment of the present application may refer to the corresponding descriptions in fig. 1 to fig. 5, and are not described herein again.
Based on the above-mentioned methods as shown in fig. 1 to 5, correspondingly, an embodiment of the present application further provides a storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the above-mentioned method for determining power flow reversal in reverse power transmission as shown in fig. 1 to 5.
Based on such understanding, the technical solution of the present application may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling an electronic device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the implementation scenarios of the present application.
Based on the method shown in fig. 1 to fig. 5 and the embodiment of the determining apparatus for reverse power flow in reverse power transmission shown in fig. 6, in order to achieve the above object, the embodiment of the present application further provides an electronic device, which may be a personal computer, a server, a network device, and the like, where the electronic device includes a storage medium and a processor; a storage medium for storing a computer program; a processor for executing a computer program to implement the above-mentioned method for determining a power flow reversal as shown in fig. 1 to 5.
Optionally, the electronic device may further include a user interface, a network interface, a camera, radio Frequency (RF) circuitry, sensors, audio circuitry, a WI-FI module, and so forth. The user interface may include a Display screen (Display), an input unit such as a keypad (Keyboard), etc., and the optional user interface may also include a USB interface, a card reader interface, etc. The network interface may optionally include a standard wired interface, a wireless interface (e.g., a bluetooth interface, WI-FI interface), etc.
It will be understood by those skilled in the art that the present embodiment provides an electronic device structure that is not limiting of the electronic device, and may include more or fewer components, or some components in combination, or a different arrangement of components.
The storage medium can also comprise an operating device and a network communication module. The operation device is a program for managing and saving hardware and software resources of the electronic device, and supports the operation of the information processing program and other software and/or programs. The network communication module is used for realizing communication among the controls in the storage medium and communication with other hardware and software in the entity equipment.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present application can be implemented by software plus a necessary general hardware platform, and can also be implemented by hardware.
Those skilled in the art will appreciate that the drawings are merely schematic representations of one preferred implementation scenario and that the elements or processes in the drawings are not necessarily required to practice the present application. Those skilled in the art will appreciate that elements of a device in an implementation scenario may be distributed in the device in the implementation scenario according to the description of the implementation scenario, or may be located in one or more devices different from the present implementation scenario with corresponding changes. The units of the implementation scenario may be combined into one unit, or may be further split into a plurality of sub-units.
The above application serial number is merely for description and does not represent the superiority and inferiority of the implementation scenario. The above disclosure is only a few specific implementation scenarios of the present application, but the present application is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present application.

Claims (10)

1. A method for judging power reversal transmission power flow reversal direction is characterized by comprising the following steps:
acquiring operation data of the intelligent electric energy meter;
determining a first judgment result according to the total active power in the operation data;
determining a second determination result according to the total reactive power in the operation data and the operation quadrant in the operation data;
determining a third determination result according to the total power factor in the operation data;
determining a fourth judgment result according to the ratio of the element power factor to the total power factor in the operation data;
and if at least one of the first determination result, the second determination result and the third determination result is not satisfied, and a fourth determination result is not satisfied, determining that the intelligent electric energy meter is in a reverse power transmission state.
2. The method according to claim 1, wherein the determining the first determination result according to the total active power in the operation data specifically includes:
if the total active power is less than 0, the first judgment result is satisfied;
and if the total active power is greater than or equal to 0, the first judgment result is unsatisfied.
3. The method according to claim 2, wherein the determining a second determination result according to the total reactive power in the operating data and the operating quadrant in the operating data specifically includes:
if the operating quadrant is a second quadrant and the total reactive power is greater than 0, the second determination result is satisfied;
if the operating quadrant is a third quadrant and the total reactive power is less than 0, the second determination result is satisfied;
otherwise, the second determination result is unsatisfied.
4. The method according to claim 1, wherein the determining a third determination result according to the total power factor in the operation data specifically comprises:
if the total power factor is less than 0, the third determination result is satisfied;
if the total power factor is greater than 0 or equal to 0, the third determination result is unsatisfied.
5. The method according to claim 1, wherein the determining a fourth determination result according to the ratio of the component power factor to the total power factor in the operation data specifically comprises:
judging the type of the intelligent electric energy meter, and determining the number of metering elements in the intelligent electric energy meter according to the type;
accumulating the element power factors of each metering element according to the number of the metering elements to obtain a sum of the element power factors, and calculating the ratio of the sum to the total power factor;
if the difference between the ratio and a preset target ratio is smaller than a first preset threshold, the fourth judgment result is satisfied;
and if the difference value between the ratio and a preset target ratio is greater than or equal to the first preset threshold value, the fourth judgment result is unsatisfied.
6. The method of claim 1, wherein prior to determining the first determination based on the total active power in the operational data, the method further comprises:
acquiring a line voltage value and a line current value by using the intelligent electric energy meter;
and if the difference value between at least one line voltage value and the rated voltage value is larger than a second preset threshold value, or at least one line current value is smaller than a third preset threshold value, stopping the judgment.
7. The method according to claim 1, wherein after determining that the smart electric energy meter is in the reverse power transmission state, the method further comprises:
and generating alarm information and pushing the alarm information to a monitoring terminal.
8. A device for determining reverse power flow in reverse power transmission, the device comprising:
the intelligent electric energy meter comprises an acquisition module, a storage module and a control module, wherein the acquisition module is used for acquiring intelligent electric energy meter data, and the intelligent electric energy meter data comprise total active power, total reactive power, element power factors and total power factors;
the judging module is used for judging whether the intelligent electric energy meter is in a power reverse transmission state or not according to the total active power and the total power factor; if yes, judging whether the intelligent electric energy meter reverses the power flow according to the element power factor, the total power factor and the reactive power.
9. A storage medium having a program or instructions stored thereon, which when executed by a processor, performs the steps of the method of any one of claims 1 to 7.
10. A computer device comprising a storage medium, a processor and a computer program stored on the storage medium and executable on the processor, characterized in that the processor implements the method of any of claims 1 to 7 when executing the program.
CN202211040954.6A 2022-08-29 2022-08-29 Method, device, medium and equipment for judging reverse direction of power reverse transmission power flow Pending CN115308477A (en)

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