CN115201743B - Method and device for determining error of metering point of low-voltage transformer area and storage medium - Google Patents
Method and device for determining error of metering point of low-voltage transformer area and storage medium Download PDFInfo
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Abstract
The invention relates to the technical field of electric power data analysis, and provides a method and a device for determining a metering point error of a low-voltage transformer area and a storage medium. The method comprises the following steps: acquiring power consumption data of a plurality of metering points of a low-voltage transformer area; determining relative errors of the plurality of metering points based on the power utilization quantity data and an energy conservation expression of the low-voltage transformer area; the energy conservation expression is determined based on line loss adjusting factors of a plurality of terminal branches in a network topological structure of the low-voltage transformer area, the line loss adjusting factors are ratios of actual line loss electric quantities of the terminal branches in a sampling time interval to basic line loss electric quantities, the basic line loss electric quantities are electric quantities generated by the terminal branches when current is constant, and the terminal branches correspond to the metering points one to one. According to the method, the line loss adjusting factor is defined to simulate the electricity utilization behavior of the user, the relative error of the metering point is more accurately estimated, and the detection rate of the metering point with small out-of-tolerance is improved.
Description
Technical Field
The invention relates to the technical field of electric power data analysis, in particular to a method and a device for determining a metering point error of a low-voltage transformer area and a storage medium.
Background
With the accumulation of data of the intelligent electric energy meter and the continuous progress of a big data analysis technology, the remote analysis of the running state of the electric energy meter based on the remote on-line monitoring and the big data analysis becomes an important evaluation means and monitoring means of the running quality of the electric energy meter in a transformer area.
According to verification conditions such as field deployment, electric energy meter dismantling and detecting and the like, a mathematical model for monitoring the operation data of the electric energy meter can realize accurate detection on a large out-of-tolerance condition that the relative error of the operation of the electric energy meter is more than 10%, but detection and hit conditions on a small out-of-tolerance condition that the relative error is within 10% are not ideal, and the requirement of increasingly complex power grid construction on the accuracy of metering equipment such as the electric energy meter is difficult to meet.
Disclosure of Invention
The invention provides a method and a device for determining a low-voltage distribution room metering point error and a storage medium, which are used for solving the defects of low detection and low hit accuracy of small out-of-tolerance situations in the prior art.
The invention provides a method for determining a metering point error of a low-voltage transformer area, which comprises the following steps:
acquiring power consumption data of a plurality of metering points of a low-voltage transformer area;
determining relative errors of the plurality of metering points based on the power consumption data and an energy conservation expression of the low-voltage transformer area;
the energy conservation expression is determined based on line loss adjustment factors of a plurality of terminal branches in a network topology structure of the low-voltage transformer area, the line loss adjustment factors are ratios of actual line loss electric quantities of the terminal branches in a sampling time interval to basic line loss electric quantities, the basic line loss electric quantities are electric quantities generated by the terminal branches when currents are constant, and the terminal branches correspond to the metering points one to one.
According to the method for determining the error of the metering point of the low-voltage transformer area, which is provided by the invention, the method further comprises the following steps:
using formulas
Determining the line loss adjustment factor;
wherein it is branched at the end
And terminal branch
In the case of a shared branch, the branch is,
representing the terminal branch
And the terminal branch
The line loss adjustment factor in between,
is the end ofBranch of
The current of (2) is measured by the sensor,
in a sampling time interval
Inner said end branch
The current at the time when the current is constant,
is said end branch
The complex conjugate of the current of (a),
in a sampling time interval
Inner said end branch
The complex conjugate of the current at constant current;
According to the method for determining the metering point error of the low-voltage transformer area, the value of the line loss adjusting factor and the electric load of the tail end branch corresponding to the line loss adjusting factor are in a negative correlation relationship;
and the variable quantity of the line loss regulating factor and the electric load of the tail end branch corresponding to the line loss regulating factor are in a negative correlation relationship.
According to the method for determining the metering point error of the low-voltage transformer area, the energy conservation expression is used for representing the energy conservation relation among the statistical loss energy, the line loss energy, the fixed loss energy and the metering point error loss energy of the low-voltage transformer area, the line loss energy is determined based on the line loss energy expression, and the line loss energy expression is used for representing the operation relation among the line loss adjusting factors, the active electric quantity, the reactive electric quantity and the voltage of the plurality of tail end branches.
According to the method for determining the metering point error of the low-voltage transformer area, provided by the invention, the expression of the line loss energy is
Wherein,
represents the line loss energy of the low-voltage station area,
indicating end branches
The linear resistance coefficient to the summary table of the low voltage station area,
representing the terminal branch
The line loss adjustment factor of (a) is,
the number of metering points of the low-voltage transformer area is represented;
branch off at said end
And terminal branch
In the case of a shared branch, the branch is,
representing the line resistance coefficients from the shared branch to the summary table,
representing the terminal branch
And the terminal branch
Line loss adjustment factor therebetween;
According to the method for determining the metering point error of the low-voltage transformer area, provided by the invention, the energy conservation expression is as follows:
wherein,
represents the amount of power supplied to the summary table,
indicating a metering point
The amount of electricity used is,
the fixed loss energy is represented by the fixed loss energy,
indicating a metering point
Relative error of (2).
According to the method for determining the error of the metering point of the low-voltage transformer area, provided by the invention, the method further comprises the following steps:
simplifying the number of the line resistance coefficient items in the energy conservation expression into two-stage star topology structure under the condition that the network topology structure of the low-voltage transformer area is a two-stage star topology structure
The number of the main components is one,
the number of the secondary branches of the low-voltage transformer area is shown.
The invention also provides a device for determining the error of the metering point of the low-voltage transformer area, which comprises:
the acquisition module is used for acquiring the power consumption data of a plurality of metering points of the low-voltage transformer area;
the processing module is used for determining relative errors of the plurality of metering points based on the power consumption data and the energy conservation expression of the low-voltage transformer area;
the energy conservation expression is determined based on line loss adjustment factors of a plurality of terminal branches in a network topology structure of the low-voltage transformer area, the line loss adjustment factors are ratios of actual line loss electric quantities of the terminal branches in a sampling time interval to basic line loss electric quantities, the basic line loss electric quantities are electric quantities generated by the terminal branches when currents are constant, and the terminal branches correspond to the metering points one to one.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the method for determining the low-voltage transformer area metering point error.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of determining a low-pressure station zone gauge error as described in any of the above.
The present invention also provides a computer program product comprising a computer program, which when executed by a processor implements a method for determining an error of a low-voltage station measurement point as described in any of the above.
According to the method, the device and the storage medium for determining the metering point error of the low-voltage transformer area, provided by the invention, the line loss adjusting factor is defined to simulate the electricity consumption behavior of a user, and the energy conservation expression of the low-voltage transformer area is established by utilizing the active electric quantity and the reactive electric quantity of the user, so that the relative error of the metering point can be estimated more accurately, and the detection rate of the metering point with small out-of-tolerance is improved.
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In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic flow chart of a method for determining an error of a metering point of a low-voltage transformer area provided by the invention;
FIG. 2 is a schematic diagram of a network topology of a low-voltage platform area provided by the present invention;
FIG. 3 is a schematic structural diagram of a device for determining an error of a metering point of a low-voltage transformer area, provided by the invention;
fig. 4 is a schematic structural diagram of an electronic device provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the embodiments of the present invention, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
With the accumulation of intelligent electric energy meter data and the continuous progress of big data analysis technology, the remote analysis of the electric energy meter running state based on remote on-line monitoring and big data analysis becomes an important evaluation means and monitoring means of the running quality of the electric energy meter in the transformer area.
According to the verification conditions of field deployment, electric energy meter dismantling detection and the like, the mathematical model for realizing the electric energy meter operation data monitoring can realize accurate detection on the large out-of-tolerance condition that the relative error of the electric energy meter operation is more than 10%, but the detection and hit conditions on the small out-of-tolerance condition that the relative error is within 10% are not ideal.
The mathematical model for monitoring the running data of the electric energy meter is usually constructed based on energy conservation, that is, for a certain distribution area, the power supply quantity of the total meter is equal to the sum of the actual power consumption of each user in the distribution area and the line loss and the loss of the electric energy meter.
The accuracy of the line loss estimation in the transformer area directly influences the accuracy of the model on the operation error estimation, and the accurate expression of the line loss is important for realizing the reliable detection and hit of the small out-of-tolerance condition.
In the embodiment of the present invention, the low-voltage distribution area refers to a power supply range or area of a transformer of a low-voltage distribution network, and the low-voltage distribution network refers to a low-voltage power grid of 0.4kV or less.
It can be understood that the current is transmitted on the transmission cable from the summary meter to the user electric energy meter for use by the user, and the network topology of the low-voltage transformer area refers to the physical layout of each electric energy meter device for electric energy transmission in the low-voltage transformer area.
The network topology structure of the low-voltage distribution area comprises a plurality of power utilization branches, wherein a branch from the general table is a first-level branch, a branch from the first-level branch is a second-level branch, and a branch directly connected with the user electric energy meter is a tail-end branch.
It should be noted that the metering point is a gateway between a customer and an electric power company or an electric power company, and may meter electric quantity as a main basis for evaluating electric power charges, and the metering point in the network topology structure of the low-voltage distribution area is a user electric energy meter, that is, the metering point corresponds to the end branch one to one.
The relative error of the operation of the electric energy meter is larger than 10 percent of the large out-of-tolerance condition, namely the relative error of the metering point is larger than 10 percent.
As shown in fig. 2, each resistor represents one branch of the network topology, and the branch name is directly represented by the resistor name.
Wherein, R123 and R4567 are primary branches, and R1, R2, R3, R4, R5, R6 and R7 are tail branches, that is, branches directly connected with the user electric energy meter.
Some branches have a shared branch between them, e.g., there is a shared branch R23 between R2 and R3; some branches do not share branches with other branches, which may be called independent branches, each of which constitutes an independent sub-tree, e.g., R123 and R4567 are independent branches, each constituting an independent sub-tree.
According to the distribution of the power supply circuit and the electric energy meter of the low-voltage transformer area, a network topology structure of the low-voltage transformer area can be constructed.
Based on a network topological structure, according to kirchhoff's law, a line loss power expression of a low-voltage distribution area can be established, and a line loss energy expression can also be established.
Kirchhoff law (Kirchhoff laws) is a basic law followed by voltage and current in a circuit, and can be used for analyzing a direct current circuit and an alternating current circuit.
Kirchhoff's law states that each element is a branch, and elements connected in series are regarded as a branch in which the current is equal everywhere.
Kirchhoff's law defines a node as a branch-to-branch connection point.
Kirchhoff's law includes kirchhoff's current law, which is a law that determines the relationship between the currents of branches at any node in a circuit, also called node current law, and specifically, the sum of all currents entering a node is equal to the sum of all currents leaving the node.
For example, as shown in FIG. 2,
representing the voltage summarized by the low voltage station,
respectively representing the voltage and the current of each user electric energy meter in the low-voltage transformer area.
FIG. 2 has labeled the relationship of the currents at the nodes according to kirchhoff's law, with the current at R23 equal to
The current on R4567 is equal to
。
In this embodiment, according to kirchhoff's law, the current-voltage relationship at each branch can be determined in the network topology of the low-voltage distribution room, and according to the overall current-voltage relationship of the network topology of the low-voltage distribution room, a line loss power expression or a line loss energy expression describing the line loss of the low-voltage distribution room is determined.
It should be noted that the line loss power expression is used to represent the operational relationship among the active power, the reactive power, and the voltage of the terminal branches in the network topology, and the line loss energy expression represents the operational relationship among the active electric quantity, the reactive electric quantity, and the voltage of the terminal branches in the network topology, and the contribution of the active power and the reactive power to the line loss is considered comprehensively.
The complex current and complex power relationship at the branches of the low-voltage network topology is described below.
The complex power is a complex quantity with the real part as active power and the imaginary part as reactive power, and is an auxiliary calculation quantity which is often related to the analysis of a current circuit by a phasor method.
In ac circuit vector analysis, the complex power includes the following expression:
wherein,
is a function of the complex power of the power,
is a voltage that is applied to the substrate,
is a current that is supplied to the power source,
is composed of
The complex number of the conjugate of (a),
、
are both representative of a complex current that is,
in order to be the power factor angle,
is the active power of the electric vehicle,
in order to be a reactive power, the power,
in units of imaginary numbers.
The line loss on the independent branch R123 of the network topology of the low-voltage station area as shown in fig. 2 is described by the expression of the complex power described above.
Branch R123 complex power is:
wherein,
in order to branch the complex power of R123,
is the resistance value on the branch R123,
is the resistance value on the branch R23,
resistance values on branches R1, R2 and R3 respectively,
respectively at branch R1, branch R2 and branch R3,
are respectively as
The complex conjugate of (a).
After mathematical operation, the following formula is obtained:
upper type complex power
The imaginary part of (a) is 0,
is the effect of the respective end branch current itself, only related to the branch current magnitude,
and
for the branch current cross term, besides the current amplitude, the phase difference of the two branch currents corresponding to the branch current cross term also has an influence on the line loss.
It should be noted that the branch current cross term is for two end branches that cross the same branch, i.e. two end branches that have a shared branch.
The expression transformation of complex power can obtain the following expression:
branch off at the end
And terminal branch
With shared branches, the following expression for the branch current cross term can be derived from the above equation:
wherein,
are respectively terminal branches
And terminal branch
The current of (a) is measured,
are respectively as
The complex number of the conjugate of (a),
are respectively terminal branches
And terminal branch
The active power of the power converter (c),
are respectively terminal branches
And terminal branch
The reactive power of (a) is,
are respectively terminal branches
And terminal branch
The voltage of (a) is set to be,
are respectively terminal branches
And terminal branch
Angle of power factor.
The above equation is estimated as follows:
the following expression is obtained:
in practical implementation, because the line resistance is much smaller than the user load impedance, the phase difference of different branch voltages is very small, and the user reactive power is also much smaller than the active power
The size is negligible, i.e. the above expression can be simplified to the following expression:
because the phase difference of the voltages on different branches can not be acquired in practice is very small, simulation experiments show that the phase difference is usually within 5 degrees, cos5 degrees is approximately equal to 0.99619, so in engineering application, a phase difference term can be omitted from the above formula, and the formula is further simplified into the following expression:
according to the above formula, combining complex powers
Has an imaginary part of 0, the line on the independent branch R123 can be used to lose power
Is represented as follows:
a method for determining the error of the metering point of the low-voltage distribution room is introduced below, the method simulates the electricity consumption behavior of a user by defining a line loss adjusting factor, an energy conservation expression of the low-voltage distribution room is established by utilizing the active and reactive electric quantities of the user, the relative error of the metering point can be estimated more accurately by solving, and the detection effect of the metering point with small out-of-tolerance is improved.
As shown in fig. 1, the method for determining the error of the low-pressure station area metering point according to the embodiment of the present invention includes steps 110 and 120.
And step 110, acquiring power consumption data of a plurality of metering points of the low-voltage transformer area.
And step 120, determining relative errors of the plurality of metering points based on the power consumption data and the energy conservation expression of the low-voltage transformer area.
The energy conservation expression is determined based on line loss adjusting factors of a plurality of terminal branches in a network topological structure of the low-voltage transformer area, the line loss adjusting factors are the ratio of actual line loss electric quantity of the terminal branches in a sampling time interval to basic line loss electric quantity, and the basic line loss electric quantity is electric quantity generated by the terminal branches when current is constant.
It can be understood that the energy conservation expression is established in advance, and parameters including the line loss regulating factor in the energy conservation expression are changed along with the change of the network topology of the low-voltage transformer area.
In this embodiment, a line loss adjustment factor is defined to simulate the power consumption behavior of a user, and the line loss adjustment factor is a ratio of an actual line loss capacity of the terminal branch in a sampling time interval to a basic line loss capacity generated when the power consumption is stable, that is, the current is constant.
The stable power utilization refers to that the load of the power utilization behavior of the user is basically kept unchanged, and the current value is relatively constant.
The line loss electric quantity refers to line loss electric quantity, the actual line loss electric quantity is line loss energy generated by actual user electricity consumption behaviors, and the basic line loss electric quantity is line loss energy generated when loads of the user electricity consumption behaviors are kept unchanged.
It can be understood that the actual line loss electric quantity is line loss energy generated by actual user electricity consumption behavior in a sampling time interval, and when the line loss adjustment factor is calculated, the basic line loss electric quantity is line loss energy generated when load of the user electricity consumption behavior is kept unchanged in the sampling time interval of the same duration.
The line loss adjustment factor is calculated according to the following formula:
determining a line loss adjustment factor;
wherein it is branched at the end
And terminal branch
In the case of a shared branch, the branch is,
indicating end branches
And terminal branch
The line loss adjustment factor in between is,
is said terminal branch
The current of (2) is measured by the sensor,
in a sampling time interval
Inner said end branch
The current at the time when the current is constant,
is said terminal branch
The complex conjugate of the current of (a),
in a sampling time interval
Inner of the terminal branch
The complex conjugate of the current when the current is constant.
It can be understood that, for the end branches without shared branches, the corresponding line loss adjustment factor is calculated as follows:
determining a line loss adjustment factor;
wherein,
representing the terminal branch
The line loss adjustment factor of (a) is,
is said end branch
The current of (a) is measured,
in a sampling time interval
Inner said end branch
The current at the time when the current is constant,
is said end branch
The complex conjugate of the current of (a),
in a sampling time interval
Inner said end branch
The complex conjugate of the current at constant current.
In actual execution, the value of the line loss adjusting factor and the electrical load of the tail end branch corresponding to the line loss adjusting factor are in a negative correlation relationship;
the variable quantity of the line loss regulating factor and the electric load of the tail end branch corresponding to the line loss regulating factor are in a negative correlation relationship.
In the embodiment, the change rule of the line loss regulating factor frozen in a day is researched by testing high-frequency acquired data of the low-voltage transformer area, namely the sampling time interval is a single day.
And dividing daily actual line loss electric quantity obtained through the electric quantity data acquired at high frequency by basic line loss electric quantity corresponding to a constant current value to obtain line loss regulating factor coincidence values and variable quantities, and negatively correlating the line loss regulating factor coincidence values with the electric loads of the corresponding tail end branches.
When the electrical load of the tail end branch becomes large, the value and the variable quantity of the line loss adjusting factor become small; when the electrical load of the tail end branch becomes smaller, the value and the variable quantity of the line loss adjusting factor become larger.
In actual implementation, the line loss adjustment factor of each terminal branch of the low-voltage distribution room changes between 1 and 20, and after the terminal branches are combined, the line loss adjustment factor change interval is greatly reduced while the rule that the value and the variation of the line loss adjustment factor are negatively related to the electrical load of the terminal branches is followed, for example, the line loss adjustment factor changes between 1 and 3 after 8 terminal branches are combined.
It should be noted that, when the load is large, the possibility of load change is reduced, the line loss adjustment factor becomes stable, the power load is large, the power consumption is correspondingly large, the user with large power consumption contributes to the line loss, and the line loss adjustment factor value and the property of negative correlation of the variation and the power load are favorable for the accuracy of line loss calculation.
It can be understood that the line loss adjustment factor is beneficial to improving the accuracy of line loss calculation, and the accurate line loss energy can be calculated through the line loss adjustment factor.
The line loss energy expression is used for representing the operational relation among the line loss adjusting factors, the active electric quantity, the reactive electric quantity and the voltage of the terminal branches.
The line loss energy expression for calculating the line loss energy is described below.
Branch off at the end
And terminal branch
With shared branches, the following expression is derived from the complex power definition:
wherein,
are respectively terminal branches
And terminal branch
The current of (a) is measured,
are respectively as
The complex number of the conjugate of (a),
are respectively terminal branches
And terminal branch
The active power of the power converter (c),
are respectively terminal branches
And terminal branch
The reactive power of (a) is,
are respectively terminal branches
And terminal branch
The voltage of (a) is set to be,
are respectively terminal branches
And terminal branch
Angle of power factor.
The method comprises the following general forms of low-voltage station line power loss based on complex current description:
and a second general form of line loss power of the low-voltage transformer area, which is described based on the operational relationship among active power, reactive power and voltage:
wherein,
in order for the power to be lost by the line,
and the number of metering points in the low-pressure station area is shown.
The electric quantity measured by the measuring point refers to the quantity of electric energy consumed by electric equipment at the measuring point, is the accumulated quantity of the product of the power of the electric energy and the time by taking kW.h as a measuring unit, and is readable data directly measured by the electric energy meter at the measuring point.
Defined by the electric quantity, sampling time interval
The internal active electric quantity is
The reactive electric quantity is
。
The general form I of low-voltage transformer area line loss energy based on complex current description is as follows:
the calculation formula for the line loss adjustment factor is calculated as follows in combination with the general form one of the line loss energy.
Wherein,
respectively expressed in sampling time intervals
Inner terminal branch
And terminal branch
The voltage at which the current is constant,
respectively expressed in sampling time intervals
Inner terminal branch
And terminal branch
The active power at a constant current level,
respectively, in sampling time intervals
Inner terminal branch
And terminal branch
The reactive power at a constant current,
respectively expressed in sampling time intervals
Inner terminal branch
And terminal branch
Power factor angle at constant current.
Substituting the formula into a general form I of the line loss energy of the low-voltage transformer area, and obtaining a line loss energy expression as follows:
wherein,
indicating the line loss energy of the low-voltage station area,
indicating end branches
To lowThe linear resistance coefficient of the summary table of the platen area,
indicating end branches
The line loss adjustment factor of (a) is,
the number of metering points of a low-voltage transformer area is represented;
branch off at the end
And terminal branch
In the case of a shared branch, the branch may be,
representing the line resistance coefficient from the shared branch to the summary table,
indicating end branches
And terminal branch
Line loss adjustment factor therebetween;
The energy conservation expression is used for representing the energy conservation relation among the statistical loss energy, the line loss energy, the fixed loss energy and the metering point error loss energy of the low-voltage transformer area.
In this embodiment, according to the energy conservation relation and the line loss energy expression of the low-voltage transformer area network topology, the energy conservation expression of the low-voltage transformer area can be obtained as follows:
wherein,
the amount of power supply to the summary table is shown,
indicating a metering point
The amount of electricity used is,
which represents the energy of the fixed loss of energy,
indicating a metering point
Relative error of (2).
The fixed loss energy refers to the electric quantity of fixed loss of a low-voltage transformer area, and the statistical loss energy, the line loss energy and the metering point error loss energy also correspond to the corresponding electric quantity.
Energy conservation expression right side
Representing the metering point error loss energy.
Left side of the energy conservation expression
Representing the statistical loss energy.
Each in the above formula
And the line resistance coefficient of each branch in the network topological structure is represented, and the line resistance coefficient refers to the resistance coefficient of the electric wire for transmitting electric energy.
Coefficient of linear resistance of the above equation
The items are
The number of the parameters is one,
the number of metering points of the low-voltage distribution area, namely the number of user electric energy meters of the low-voltage distribution area,
is derived from
The number of combinations of 2 measurement points is taken out of the measurement points.
It should be noted that the linear resistance coefficients from the shared branch to the summary table are constant, and the linear resistance coefficients of the user electric energy meters connected to the end branches of the same shared branch may be combined to obtain the linear resistance coefficient before the table.
For example, as shown in FIG. 2,
and
are the line resistance coefficients from the R23 shared branch to the summary table.
In the embodiment, by introducing the front linear resistance coefficient of the meter, and according to the network topology of most urban residential district, the meter is a two-stage star topology, the master meter is used as a central node, the first-stage branches connected with the master meter form a first-stage star structure, the second-stage branches connected with the first-stage branches form a second-stage star structure, and when the low-voltage district is a second-stage star topology, the second-stage branches can be terminal branches connected with the user electric energy meter.
Under the condition that the network topology structure of the low-voltage transformer area is a two-stage star topology structure, the linear resistance coefficient in the energy conservation expression is
The number of items is reduced to
The number of the main components is one,
the number of the secondary branches of the low-voltage transformer area.
In this embodiment, the linear resistance coefficient is expressed by conservation of energy
The number of the items is simplified, the number of unknown quantities of the expression can be greatly reduced, and the solving stability of the expression is further improved.
In step 110, power consumption data of a plurality of metering points in the low-voltage transformer area are obtained, and an energy conservation expression is solved according to the power consumption data of the active power consumption data, the reactive power consumption data, the voltage data and the like of each metering point.
It should be noted that the power consumption data can be obtained by directly reading the user electric energy meter, the power consumption data is the power consumption data within a certain sampling time interval, in the actual execution, each metering point has respective power consumption data, and the power consumption data can be directly read through the electric energy meter, and includes the power consumption data read by the electric energy meters of a plurality of metering points in the low-voltage distribution room.
In actual implementation, the power consumption data can be acquired in a high-frequency data acquisition mode, the line loss of the low-voltage transformer area can be estimated more accurately, the data acquisition duration can be reduced, and the influence of line resistance change is reduced.
In step 120, the power consumption data is substituted into the energy conservation expression to perform solution, so as to determine data such as relative errors of the metering points and fixed loss energy, and in actual execution, multiple batches of power consumption data can be obtained and substituted into the energy conservation expression to perform solution.
It should be noted that, according to the negative correlation between the value and the variation of the line loss adjustment factor and the electrical load, it can be known that the electrical mode of each end branch has only a limited number, that is, the load variation mode has only a limited number.
Setting the power mode to M, the possible line loss adjustment coefficients of the two end branches with shared branches are
And determining possible number of the line loss adjustment factor items in the energy conservation expression, and facilitating reliable and stable solution of the energy conservation expression.
In the embodiment, on the basis of introducing reactive power contribution to line loss description, a line loss adjusting factor is defined to simulate the power utilization behavior of a user, an energy conservation expression is obtained by combining an energy conservation relation, the number of unknown quantities such as line resistance coefficient items is reduced by combining terminal branches, and the engineering practicability is improved.
According to the method for determining the metering point error of the low-voltage transformer area, provided by the embodiment of the invention, the line loss adjusting factor is defined to simulate the electricity consumption behavior of a user, and the energy conservation expression of the low-voltage transformer area is established by utilizing the active electric quantity and the reactive electric quantity of the user, so that the relative error of the metering point can be estimated more accurately, and the detection rate of the metering point with small out-of-tolerance is improved.
As shown in fig. 3, an apparatus for determining an error of a low-voltage station measurement point according to an embodiment of the present invention includes:
the acquiring module 310 is configured to acquire power consumption data of a plurality of metering points in a low-voltage distribution area;
the processing module 320 is used for determining relative errors of a plurality of metering points based on the electricity consumption data and the energy conservation expression of the low-voltage transformer area;
the energy conservation expression is determined based on respective line loss adjusting factors of a plurality of terminal branches in a network topological structure of the low-voltage transformer area, the line loss adjusting factors are the ratio of actual line loss electric quantity of the terminal branches in a sampling time interval to basic line loss electric quantity, the basic line loss electric quantity is electric quantity generated by the terminal branches when current is constant, and the terminal branches correspond to the metering points one to one.
In some embodiments, the processing module 320 is also used to apply formulas
Determining a line loss adjustment factor;
wherein it is branched at the end
And terminal branch
In the case of a shared branch, the branch is,
indicating end branches
And terminal branch
The line loss adjustment factor in between is,
is a terminal branch
The current of (2) is measured by the sensor,
in a sampling time interval
Inner terminal branch
The current at the time when the current is constant,
is a terminal branch
The complex conjugate of the current of (a),
in a sampling time interval
Inner terminal branch
A complex conjugate of the current at a constant current;
In some embodiments, the value of the line loss adjustment factor and the electrical load of the terminal branch corresponding to the line loss adjustment factor are in a negative correlation relationship;
the variable quantity of the line loss regulating factor and the electric load of the tail end branch corresponding to the line loss regulating factor are in a negative correlation relationship.
In some embodiments, the energy conservation expression is used for representing an energy conservation relation among statistical loss energy, line loss energy, fixed loss energy and metering point error loss energy of the low-voltage transformer area, the line loss energy is determined based on the line loss energy expression of the low-voltage transformer area, and the line loss energy expression is used for representing an operational relation among line loss adjusting factors, active electric quantities, reactive electric quantities and voltages of the plurality of terminal branches.
In some embodiments, the line loss energy is expressed as
Wherein,
indicating the line loss energy of the low-voltage station area,
indicating end branches
The linear resistance coefficient to the summary table of the low voltage station area,
representing the terminal branch
The line loss adjustment factor of (a) is,
the number of metering points in the low-voltage distribution room is represented;
branch off at the end
And terminal branch
In the case of a shared branch, the branch may be,
representing the line resistance coefficient from the shared branch to the summary table,
indicating end branches
And terminal branch
Line loss adjustment factor therebetween;
In some embodiments, the energy conservation expression is:
wherein,
the amount of power supplied to the general table is shown,
indicating a metering point
The amount of electricity used is,
which represents the energy of the fixed loss of energy,
indicating a metering point
Relative error of (2).
In some embodiments, the processing module 320 is further configured to reduce the number of the linear resistance coefficient terms in the energy conservation expression to be two-stage star topology in the case that the network topology of the low-voltage transformer area is a two-stage star topology
The number of the main components is one,
the number of the secondary branches of the low-voltage transformer area.
Fig. 4 illustrates a physical structure diagram of an electronic device, which may include, as shown in fig. 4: a processor (processor) 410, a communication Interface 420, a memory (memory) 430 and a communication bus 440, wherein the processor 410, the communication Interface 420 and the memory 430 are communicated with each other via the communication bus 440. The processor 410 may invoke logic instructions in the memory 430 to perform a method of low-pressure station zone metering point error determination, the method comprising: acquiring power consumption data of a plurality of metering points of a low-voltage transformer area; determining relative errors of a plurality of metering points based on the power consumption data and an energy conservation expression of the low-voltage transformer area; the energy conservation expression is determined based on line loss adjusting factors of a plurality of terminal branches in a network topological structure of a low-voltage transformer area, the line loss adjusting factors are the ratio of actual line loss electric quantity of the terminal branches in a sampling time interval to basic line loss electric quantity, the basic line loss electric quantity is electric quantity generated by the terminal branches when current is constant, and the terminal branches correspond to metering points one to one.
In addition, the logic instructions in the memory 430 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention further provides a computer program product, the computer program product including a computer program, the computer program being stored on a non-transitory computer-readable storage medium, wherein when the computer program is executed by a processor, the computer is capable of executing the method for determining the low-pressure station metering point error provided by the above methods, the method including: acquiring power consumption data of a plurality of metering points of a low-voltage transformer area; determining relative errors of a plurality of metering points based on the power consumption data and an energy conservation expression of the low-voltage transformer area; the energy conservation expression is determined based on respective line loss adjusting factors of a plurality of terminal branches in a network topological structure of the low-voltage transformer area, the line loss adjusting factors are the ratio of actual line loss electric quantity of the terminal branches in a sampling time interval to basic line loss electric quantity, the basic line loss electric quantity is electric quantity generated by the terminal branches when current is constant, and the terminal branches correspond to the metering points one to one.
In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, the computer program, when being executed by a processor, implementing a method for determining an error of a low-pressure station area metering point, the method including: acquiring power consumption data of a plurality of metering points of a low-voltage transformer area; determining relative errors of a plurality of metering points based on the power consumption data and an energy conservation expression of the low-voltage transformer area; the energy conservation expression is determined based on respective line loss adjusting factors of a plurality of terminal branches in a network topological structure of the low-voltage transformer area, the line loss adjusting factors are the ratio of actual line loss electric quantity of the terminal branches in a sampling time interval to basic line loss electric quantity, the basic line loss electric quantity is electric quantity generated by the terminal branches when current is constant, and the terminal branches correspond to the metering points one to one.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. Based on the understanding, the above technical solutions substantially or otherwise contributing to the prior art may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the various embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for determining the error of a metering point of a low-voltage transformer area is characterized by comprising the following steps:
acquiring power consumption data of a plurality of metering points of a low-voltage transformer area;
determining relative errors of the plurality of metering points based on the power utilization quantity data and an energy conservation expression of the low-voltage transformer area;
the energy conservation expression is determined based on line loss adjustment factors of a plurality of terminal branches in a network topology structure of the low-voltage transformer area, the line loss adjustment factors are ratios of actual line loss electric quantities of the terminal branches in a sampling time interval to basic line loss electric quantities, the basic line loss electric quantities are electric quantities generated by the terminal branches when currents are constant, and the terminal branches correspond to the metering points one to one;
the value of the line loss adjusting factor and the electric load of the tail end branch corresponding to the line loss adjusting factor are in a negative correlation relationship;
the variation of the line loss adjusting factor and the electric load of the tail end branch corresponding to the line loss adjusting factor are in a negative correlation relationship;
the method further comprises the following steps:
using formulas
Determining the line loss adjustment factor;
wherein it is branched at the end
And terminal branch
In the case of a shared branch, the branch is,
representing the terminal branch
And the terminal branch
The line loss adjustment factor in between,
is said end branch
The current of (2) is measured by the sensor,
in a sampling time interval
Inner said end branch
The current at the time when the current is constant,
is said end branch
The complex conjugate of the current of (a),
in a sampling time interval
Inner said end branch
The complex conjugate of the current at constant current;
2. The method according to claim 1, wherein the energy conservation expression is used to represent an energy conservation relationship among statistical loss energy, line loss energy, fixed loss energy, and metering point error loss energy of the low-voltage distribution room, the line loss energy is determined based on a line loss energy expression, and the line loss energy expression is used to represent an operational relationship among line loss adjustment factors, active power, reactive power, and voltage of the plurality of end branches.
3. The method for determining the metering point error of the low-voltage transformer area as claimed in claim 2, wherein the line loss energy is expressed by
Wherein,
representing the line loss energy of the low-voltage station,
indicating end branches
The linear resistance coefficient to the summary table of the low voltage station area,
representing the terminal branch
The line loss adjustment factor of (a) is,
the number of metering points of the low-voltage transformer area is represented;
branch off at said end
And terminal branch
In the case of a shared branch, the branch may be,
representing the line resistance coefficient from the shared branch to the summary table,
representing the terminal branch
And the terminal branch
Line loss adjustment factor in between;
4. The method for determining the metering point error of the low-pressure area as claimed in claim 3, wherein the energy conservation expression is as follows:
wherein,
the amount of power supply of the summary table is represented,
indicating a metering point
The amount of electricity used is,
the fixed loss energy is represented by a value,
indicating a metering point
Relative error of (2).
5. The method for determining the error of the metering point of the low pressure area as claimed in claim 4, wherein the method further comprises:
network topology in the low-voltage areaSimplifying the number of the linear resistance coefficient items in the energy conservation expression into two-stage star topology structure
The number of the main components is one,
the number of the secondary branches of the low-voltage transformer area is shown.
6. An apparatus for determining a low-pressure station metering point error, comprising:
the acquisition module is used for acquiring the power consumption data of a plurality of metering points of the low-voltage transformer area;
the processing module is used for determining relative errors of the plurality of metering points based on the power consumption data and the energy conservation expression of the low-voltage transformer area;
the energy conservation expression is determined based on line loss adjustment factors of a plurality of terminal branches in a network topology structure of the low-voltage transformer area, the line loss adjustment factors are the ratio of actual line loss electricity quantity of the terminal branches in a sampling time interval to basic line loss electricity quantity, the basic line loss electricity quantity is electricity quantity generated by the terminal branches when current is constant, and the terminal branches correspond to the metering points one to one;
the value of the line loss adjusting factor and the electric load of the tail end branch corresponding to the line loss adjusting factor are in a negative correlation relationship;
the variation of the line loss adjusting factor and the electric load of the tail end branch corresponding to the line loss adjusting factor are in a negative correlation relationship;
the device further comprises:
using formulae
Determining the line loss adjustment factor;
wherein it is branched at the end
And terminal branch
In the case of a shared branch, the branch may be,
representing the terminal branch
And the terminal branch
The line loss adjustment factor in between,
is said end branch
The current of (2) is measured by the sensor,
in a sampling time interval
Inner said end branch
The current at the time when the current is constant,
is said terminal branch
The complex conjugate of the current of (a),
in a sampling time interval
Inner said end branch
A complex conjugate of the current at a constant current;
7. An electronic device comprising a memory, a processor and a computer program stored on said memory and executable on said processor, wherein said processor when executing said program implements a method for determining a low pressure station spot error as claimed in any one of claims 1 to 5.
8. A non-transitory computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method for determining the error of the low pressure station measurement point according to any one of claims 1 to 5.
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