CN112035784B - Method and system for determining loss of low-voltage transformer area based on electricity consumption acquisition data - Google Patents

Method and system for determining loss of low-voltage transformer area based on electricity consumption acquisition data Download PDF

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CN112035784B
CN112035784B CN202010686416.9A CN202010686416A CN112035784B CN 112035784 B CN112035784 B CN 112035784B CN 202010686416 A CN202010686416 A CN 202010686416A CN 112035784 B CN112035784 B CN 112035784B
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preset time
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loss
station area
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刘婧
陈昊
林繁涛
张密
葛得辉
周晖
彭楚宁
王齐
李思源
徐龙光
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Beijing Zhixiang Technology Co Ltd
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China Electric Power Research Institute Co Ltd CEPRI
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Abstract

The invention relates to a method and a system for determining loss of a low-voltage station area based on electricity consumption acquisition data, wherein the method comprises the following steps: acquiring high-frequency acquisition data of power consumption of each user sub-table in a first preset time period, acquiring a power supply quantity value of a total table in a station area in each second preset time period, and acquiring freezing power consumption of each user sub-table in each second preset time period; determining a station area line loss expression of the low-voltage station area in each second preset time period; determining a statistical line loss equation of the low-voltage station area in each second preset time period; establishing a statistical line loss equation set, and solving according to the power consumption high-frequency acquisition data, the power supply quantity value and the freezing power consumption to determine the metering error of each user sub-meter in the low-voltage station area, the fixed loss of the station area and the equivalent resistance of each branch; substituting the metering error of each user sub-meter and the equivalent resistance of each branch in the low-voltage station area into a station area line loss expression to determine the station area line loss of the low-voltage station area.

Description

Method and system for determining loss of low-voltage transformer area based on electricity consumption acquisition data
Technical Field
The invention relates to the technical field of electric energy metering, in particular to a method and a system for determining loss of a low-voltage station area based on electricity collection data.
Background
Because the network of the power grid is complex, the load distribution is uneven, the data of each part in the line is not complete, and the difficulty of accurate calculation of the line loss is great, the calculation can be generally carried out only by adopting a simplified method. There are two methods commonly used, namely, a cell loss rate method and a voltage loss rate method. The method for measuring the loss rate of the transformer area needs to actually measure the electric energy loss and the loss rate of each typical transformer area, the actual measurement needs to draw a network wiring diagram of a power grid, the calculation line segments of a main line and a branch line of a line are divided, then the load current is calculated section by section, and the characteristic coefficient of a load curve of the line needs to be measured. The method has great limitation because the field workload is large, the line loss cannot be calculated for each station area, and only the typical station area can be estimated.
Therefore, a method capable of accurately and rapidly determining the loss of a low voltage station is needed.
Disclosure of Invention
The invention provides a method and a system for determining loss of a low-voltage station area based on electricity acquisition data, which are used for solving the problem of accurately determining line loss of the low-voltage station area.
In order to solve the above-mentioned problems, according to an aspect of the present invention, there is provided a method of determining loss of a low voltage station area based on power acquisition data, the method including:
acquiring high-frequency acquisition data of power consumption of each user sub-table in a first preset time period, acquiring a power supply quantity value of a total table in a station area in each second preset time period, and acquiring freezing power consumption of each user sub-table in each second preset time period; the first preset time period comprises a plurality of second preset time periods;
determining a station area line loss expression of the low-voltage station area in each second preset time period based on kirchhoff's law;
determining a statistical line loss equation of the low-voltage station area in each second preset time period based on the relation among the statistical line loss of the low-voltage station area, the station area line loss, the station area fixed loss and the electric energy loss caused by errors of all user sub-meters under the station area and the station area line loss expression;
establishing a statistical line loss equation set according to a statistical line loss equation of the low-voltage station area in each second preset time period, and solving the statistical line loss equation set according to the high-frequency acquisition data of the power consumption, the power supply quantity value and the freezing power consumption so as to determine the metering error of each user sub-meter in the low-voltage station area, the fixed loss of the station area and the equivalent resistance of each branch;
substituting the metering error of each user sub-table and the equivalent resistance of each branch in the low-voltage station area into a station area line loss expression of the low-voltage station area in each second preset time period, and determining the station area line loss of the low-voltage station area in each second preset time period.
Preferably, wherein the method further comprises:
and carrying out data format and integrity verification on the power consumption high-frequency acquisition data, and cleaning abnormal data with data loss, data abnormality and file error to obtain the power consumption high-frequency acquisition data subjected to data cleaning.
Preferably, the determining the expression of the transformer area line loss of the low-voltage transformer area in each second preset time period based on kirchhoff law includes:
LL (i) is the line loss of the low-voltage station in the ith second preset time period; phi (phi) j (i m )、U j (i m ) Andrespectively the mth sampling period Δt (i) of the user j in the ith second preset period m ) The electricity consumption measurement value, the voltage and the power factor are obtained by collecting data of the electricity consumption at high frequency; phi (phi) k (i m )、U k (i m ) Andrespectively the mth sampling period Δt (i) of user k in the ith second preset period m ) The electricity consumption measurement value, the voltage and the power factor are obtained by collecting data of the electricity consumption at high frequency; epsilon j And epsilon k The metering errors of the intelligent electric energy meters corresponding to the user j and the user k are respectively; p is the total number of users; alpha jk The equivalent resistance of the common branch between the user j and the user k; q i The total number of sampling points in the ith second preset time period is set; the second preset time period is equal to q i A sampling period Δt (i m ) And (3) summing.
Preferably, the determining a statistical line loss equation of the low-voltage transformer area in each second preset time period based on the relation among the statistical line loss of the low-voltage transformer area, the transformer area line loss, the transformer area fixed loss and the electric energy loss caused by errors of all subscriber sub-tables under the transformer area and the transformer area line loss expression includes:
wherein, the polynomial on the left of the equal sign is the statistical line loss; the first term to the right of the equal sign is the zone line loss; second term epsilon to the right of the equal sign 0 Fixing loss for the station area; the third item on the right of the equal sign is the electric energy loss caused by the error of all user sub-meters under the transformer area; y (i) is the power supply quantity metering value of the total table of the station area in the ith second preset time period; phi (phi) j (i) And (5) freezing the electricity consumption of the user j in the ith second preset time period.
Preferably, the second preset time period is one day.
According to another aspect of the present invention, there is provided a system for determining line loss and fixed loss of a low voltage station area based on electricity usage acquisition data, the system comprising:
the data acquisition unit is used for acquiring high-frequency acquisition data of the power consumption of each user sub-table in a first preset time period, acquiring the power supply quantity value of the total table in each second preset time period, and acquiring the freezing power consumption of each user sub-table in each second preset time period; the first preset time period comprises a plurality of second preset time periods;
the station area line loss expression determining unit is used for determining a station area line loss expression of the low-voltage station area in each second preset time period based on kirchhoff's law;
a statistical line loss equation determining unit, configured to determine a statistical line loss equation of a low-voltage transformer area in each second preset time period based on a relation among a statistical line loss of the low-voltage transformer area, a transformer area line loss, a transformer area fixed loss, and electric energy loss caused by errors of all user sub-tables under the transformer area, and the transformer area line loss expression;
the station area fixed loss determining unit is used for establishing a statistical line loss equation set according to the statistical line loss equation of the low-voltage station area in each second preset time period, and solving the statistical line loss equation set according to the high-frequency acquisition data of the power consumption, the power supply quantity value and the freezing power consumption so as to determine the metering error of each user sub-meter in the low-voltage station area, the station area fixed loss and the equivalent resistance of each branch;
and the station area line loss determining unit is used for substituting the metering error of each user sub-table in the low-voltage station area and the equivalent resistance of each branch into a station area line loss expression of the low-voltage station area in each second preset time period to determine the station area line loss of the low-voltage station area in each second preset time period.
Preferably, wherein the system further comprises:
and the data cleaning unit is used for carrying out data format and integrity verification on the power consumption high-frequency acquisition data and cleaning abnormal data with data loss, data abnormality and file error so as to acquire the power consumption high-frequency acquisition data subjected to data cleaning.
Preferably, the expression determining unit for determining the area line loss of the low-voltage area within each second preset time period based on kirchhoff's law includes:
LL (i) is the line loss of the low-voltage station in the ith second preset time period; phi (phi) j (i m )、U j (i m ) Andrespectively the mth sampling period Δt (i) of the user j in the ith second preset period m ) The electricity consumption measurement value, the voltage and the power factor are obtained by collecting data of the electricity consumption at high frequency; phi (phi) k (i m )、U k (i m ) Andrespectively the mth sampling period Δt (i) of user k in the ith second preset period m ) The electricity consumption measurement value, the voltage and the power factor are obtained by collecting data of the electricity consumption at high frequency; epsilon j And epsilon k The metering errors of the intelligent electric energy meters corresponding to the user j and the user k are respectively; p is the total number of users; alpha jk The equivalent resistance of the common branch between the user j and the user k; q i The total number of sampling points in the ith second preset time period is set; the second preset time period is equal to q i A sampling period Δt (i m ) And (3) summing.
Preferably, the statistical line loss equation determining unit determines a statistical line loss equation of the low-voltage transformer area in each second preset time period based on a relation among the statistical line loss of the low-voltage transformer area, the transformer area line loss, the transformer area fixed loss and the power loss caused by errors of all subscriber sub-meters under the transformer area and the transformer area line loss expression, including:
wherein, the polynomial on the left of the equal sign is the statistical line loss; the first term to the right of the equal sign is the zone line loss; second term epsilon to the right of the equal sign 0 Fixing loss for the station area; the third item on the right of the equal sign is the electric energy loss caused by the error of all user sub-meters under the transformer area; y (i) is the power supply quantity metering value of the total table of the station area in the ith second preset time period; phi j (i) And (5) freezing the electricity consumption of the user j in the ith second preset time period.
Preferably, the second preset time period is one day.
The invention provides a method and a system for determining loss of a low-voltage station area based on power consumption acquisition data, which are used for acquiring power consumption high-frequency acquisition data acquired by high frequency, a power supply quantity value of a total table of the station area and freezing power consumption of each user sub-table, cleaning data and screening according to archive information, so as to ensure the accuracy of data sources; estimating line loss based on kirchhoff's law; the real power supply topology of the transformer area is not required to be known, the total table and the sub-table of the transformer area are only required to be known according to the file information in the marketing system, the equation dependence relationship between the statistical line loss of the transformer area and the sub-table of each user is established based on the law of conservation of energy, and finally the line loss of the transformer area and the fixed loss of the transformer area are obtained by solving an equation set. The method can rapidly and accurately determine the line loss and the fixed loss of the station area, and has convenient operation and wide application range.
Drawings
Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:
FIG. 1 is a flow chart of a method 100 of determining loss of a low voltage bay based on power usage collected data in accordance with an embodiment of the present invention;
fig. 2 is a schematic diagram of a system 200 for determining loss of a low voltage station based on power usage collected data in accordance with an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flow chart of a method 100 of determining loss of a low voltage bay based on power usage collected data in accordance with an embodiment of the present invention. As shown in fig. 1, the method for determining the loss of the low-voltage station area based on the electricity collection data provided by the embodiment of the invention obtains the electricity consumption high-frequency collection data collected by high frequency, the electricity supply quantity value of the total table of the station area and the freezing electricity consumption of each user sub-table, and performs data cleaning and screening according to file information to ensure the accuracy of data sources; estimating line loss based on kirchhoff's law; the real power supply topology of the transformer area is not required to be known, the total table and the sub-table of the transformer area are only required to be known according to the file information in the marketing system, the equation dependence relationship between the statistical line loss of the transformer area and the sub-table of each user is established based on the law of conservation of energy, and finally the line loss of the transformer area and the fixed loss of the transformer area are obtained by solving an equation set. The method can rapidly and accurately determine the line loss and the fixed loss of the station area, and has convenient operation and wide application range. The method 100 for determining loss of a low-voltage station area based on power consumption acquisition data provided by the embodiment of the invention starts from a step 101, acquires power consumption high-frequency acquisition data of high-frequency acquisition of each user sub-table in a first preset time period, acquires a power supply quantity value of a total table of the station area in each second preset time period, and acquires freezing power consumption of each user sub-table in each second preset time period in the step 101; the first preset time period comprises a plurality of second preset time periods.
Preferably, wherein the method further comprises:
and carrying out data format and integrity verification on the power consumption high-frequency acquisition data, and cleaning abnormal data with data loss, data abnormality and file error to obtain the power consumption high-frequency acquisition data subjected to data cleaning.
Preferably, the second preset time period is one day.
A low voltage zone is typically referred to as a transformer powered area, and a summary provides energy input to a plurality of consumer tables under the zone. In an embodiment of the present invention, separating three types of loss under a bay from the statistical line loss TL (TOTAL LOSE) includes: LINE loss LL (LINE loss), fixed loss FL (FIXED LOSE), and power loss EL (ERROR LOSE) due to user sub-meter errors under the transformer area. If the line loss is determined by using the daily frozen power data according to the above relation, the following two key advantages and disadvantages exist.
Wherein, the advantage is: the accuracy of the electric energy meter measurement can lead to certain quantization errors of the data (namely, the acquired data has certain rounding errors), and the quantization errors can be amplified by times by adding the comprehensive multiplying power of the electric energy meter measurement. The time interval between the collected data points is increased, so that the influence of quantization errors is obviously reduced, and the method has certain benefits for calculating the metering errors EL of the electric energy meter;
the defects are as follows: when estimating the line loss LL, the daily average current is obtained by using the daily frozen power/(voltage-power factor), and the daily current fluctuation range of the user is usually relatively large, so that a large deviation is generated in the estimation of the line loss LL by using the daily frozen power data.
Through the analysis, it is easy to find that if the daily frozen electric quantity is estimated by using the daily frozen electric quantity for the EL part and the high-frequency electric quantity, voltage and power factor data acquired by using the HPLC for the LL part are estimated, the advantages of the daily frozen electric quantity data can be fully utilized, and the defects of the daily frozen electric quantity data can be avoided.
Therefore, in the embodiment of the invention, based on the file information of the total table of the area and the user sub-table obtained by the marketing system, the high-frequency acquisition data and the freezing amount data of the power consumption obtained by the power consumption information acquisition system and the high-frequency acquisition of the total table of the area and the user sub-table are used for carrying out related inspection on the data format, the integrity and the like of the acquired data, carrying out data cleaning on abnormal data such as data loss, data abnormality, file error and the like, and finally obtaining the cleaned high-quality data for determining the line loss of the area and the fixed loss of the area. Wherein, the high frequency acquisition data of electricity consumption includes: power usage, voltage and power factor curves for each sampling time interval.
In an embodiment of the present invention, the first preset time period is set to be a plurality of days, and the second preset time period is set to be one day. The collection time of the high-frequency collection data of the electricity consumption of the user sub-meter can be set according to the requirement. The time of each sampling can be set to be the same time interval, for example, the sampling mode of 96-point electric quantity is set, wherein 96 points refer to that 24 hours are equally divided into 96 parts, and each 15 minutes is sampled; of course, the acquisition mode of 48 points or the acquisition mode of 24 points can be set according to the requirements. The time of each sampling can also be set to be different time intervals, but although the sampling time intervals of different days are inconsistent, the sampling time of different users in the same day is consistent.
In step 102, a zone line loss expression of the low voltage zone for each second preset time period is determined based on kirchhoff's law. Preferably, the determining the expression of the transformer area line loss of the low-voltage transformer area in each second preset time period based on kirchhoff law includes:
LL (i) is the line loss of the low-voltage station in the ith second preset time period; phi (phi) j (i m )、U j (i m ) Andrespectively the mth sampling period Δt (i) of the user j in the ith second preset period m ) The electricity consumption measurement value, the voltage and the power factor are obtained by collecting data of the electricity consumption at high frequency; phi (phi) k (i m )、U k (i m ) Andrespectively the mth sampling period Δt (i) of user k in the ith second preset period m ) The electricity consumption measurement value, the voltage and the power factor are obtained by collecting data of the electricity consumption at high frequency; epsilon j And epsilon k The metering errors of the intelligent electric energy meters corresponding to the user j and the user k are respectively; p is the total number of users; alpha jk The equivalent resistance of the common branch between the user j and the user k; q i Is the ithThe total number of sampling points in a second preset time period; the second preset time period is equal to q i A sampling period Δt (i m ) And (3) summing.
Assuming that p users are in the platform area and the users are resistive loads, the second preset time is 1 day, and the high-frequency acquisition mode of the electricity consumption, the voltage and the power factor is a 96-point acquisition mode, the line loss LL (i) of the ith day of the platform area should be equal to the sum of the line losses generated in 96 15-minute time periods of the ith day, namely:
wherein LL (i) m ) Represents line loss on day i, m, for 15 minutes.
The derivation of the above formula can be given by:
wherein X is j (i m ),U j (i m ) Andrepresenting the actual power consumption, voltage and power factor, X, of the jth user in the mth 15 minutes of the ith day, respectively k (i m ),U k (i m ) And->Representing the actual power consumption, voltage and power factor, alpha, of the kth user in the mth 15 minutes of the ith day, respectively jk The equivalent resistance of the common branch between user j and user k is a constant to be determined.
As can be seen from the above two formulas, the line loss LL (i) on the i-th day of the station area is:
due to the actual power consumption X of the user j Cannot be obtained, so by introducing a calculation error ε j Using electricity consumption measurements phi of the user j To represent the true value X of the electricity consumption of the user j The method comprises the following steps:
X j (i m )＝φ j (i m )(1-ε j )，
the relation of the line loss LL (i) on the ith day of the station area can be obtained by the two formulas:
thus, once the power topology of the cell is determined, the equivalent resistance of each branch of the cell is determined, so that α is jk It is reasonable to build a solution to the system of equations as a pending constant. Because the current deviation in each sampling time period is smaller, the expression of the line loss LL is more accurate, the establishment of the equation set is more reasonable, and the final solving result is more convincing.
Since the time detection between different sampling points does not have to be consistent, i.e. the reference times of the segments within a certain day do not have to be consistent (and the reference time segments of different days may also be inconsistent, but the time segments of different users within the same day have to be consistent): sometimes, due to acquisition failure, etc., the time length between the acquired data points is not equal; or because of data cleaning, the time length between the data points is disordered, and the time length between the finally adopted data is not equal. Therefore, in the embodiment of the present invention, the expression of the cell line loss established with the high frequency data of different time intervals is set as:
LL (i) is the line loss of the low-voltage station in the ith second preset time period; phi (phi) j (i m )、U j (i m ) Andrespectively the mth sampling period Δt (i) of the user j in the ith second preset period m ) The electricity consumption measurement value, the voltage and the power factor are obtained by collecting data of the electricity consumption at high frequency; phi (phi) k (i m )、U k (i m ) Andrespectively the mth sampling period Δt (i) of user k in the ith second preset period m ) The electricity consumption measurement value, the voltage and the power factor are obtained by collecting data of the electricity consumption at high frequency; epsilon j And epsilon k The metering errors of the intelligent electric energy meters corresponding to the user j and the user k are respectively; p is the total number of users; alpha jk The equivalent resistance of the common branch between the user j and the user k; q i The total number of sampling points in the ith second preset time period is set; the second preset time period is equal to q i A sampling period Δt (i m ) And (3) summing.
In step 103, based on the relation among the statistical line loss of the low-voltage station area, the station area line loss, the station area fixed loss and the electric energy loss caused by the errors of all user sub-meters under the station area and the station area line loss expression, determining a statistical line loss equation of the low-voltage station area in each second preset time period.
Preferably, the determining a statistical line loss equation of the low-voltage transformer area in each second preset time period based on the relation among the statistical line loss of the low-voltage transformer area, the transformer area line loss, the transformer area fixed loss and the electric energy loss caused by errors of all subscriber sub-tables under the transformer area and the transformer area line loss expression includes:
wherein, the polynomial on the left of the equal sign is the statistical line loss; equal signThe first term on the right is the area line loss; second term epsilon to the right of the equal sign 0 Fixing loss for the station area; the third item on the right of the equal sign is the electric energy loss caused by the error of all user sub-meters under the transformer area; y (i) is the power supply quantity metering value of the total table of the station area in the ith second preset time period; phi (phi) j (i) And (5) freezing the electricity consumption of the user j in the ith second preset time period.
In the embodiment of the invention, based on the relation among the statistical line loss of the low-voltage station area, the station area line loss, the station area fixed loss and the electric energy loss caused by the error of all user sub-meters under the station area and the station area line loss expression, the statistical line loss equation of the low-voltage station area in each second preset time period is determined as follows:
the polynomial on the left of the equal sign is the statistical line loss TL; the first term to the right of the equal sign is the zone line loss LL; second term epsilon to the right of the equal sign 0 Fixing the loss FL for the station area; the third item on the right of the equal sign is the electric energy loss EL caused by the error of all user sub-meters under the transformer area; y (i) is the power supply quantity metering value of the total table of the station area in the ith second preset time period; phi (phi) j (i) And (5) freezing the electricity consumption of the user j in the ith second preset time period.
In step 104, a system of statistical line loss equations is established according to the statistical line loss equations of the low-voltage station area in each second preset time period, and the system of statistical line loss equations is solved according to the high-frequency acquisition data of the power consumption, the power consumption measurement value and the freezing power consumption, so as to determine the measurement error of each user sub-meter, the fixed loss of the station area and the equivalent resistance of each branch in the low-voltage station area.
In step 105, the metering error of each user sub-table and the equivalent resistance of each branch in the low-voltage station area are substituted into the station area line loss expression of the low-voltage station area in each second preset time period, and the station area line loss of the low-voltage station area in each second preset time period is determined.
In an embodiment of the invention, LL is determined from high frequency collected power, voltage and power factor data, EL is determined from daily frozen power data. And accumulating the total table of the area and the high-frequency electric quantity of the user sub-table for N days, so that an equation set consisting of N equations can be established, and the line loss LL of the area and the fixed loss FL of the area can be determined by solving the equation set.
In addition, in the embodiment of the present invention, it was found that the fluctuation of the current in 15 minutes was relatively small, so that the station area line loss and the station area fixed loss can be determined based on the high-frequency power data of 96 points.
The method of the embodiment of the invention does not need to draw a power network wiring diagram as the traditional method, does not need to actually measure the characteristic coefficients of load curves such as line resistance and the like, but builds a mathematical model to solve by using a big data analysis method, and has more convenient operation and wider application range.
Fig. 2 is a schematic diagram of a system 200 for determining loss of a low voltage station based on power usage collected data in accordance with an embodiment of the present invention. As shown in fig. 2, a system 200 for determining line loss and fixed loss in a low voltage station area based on power consumption collection data according to an embodiment of the present invention includes: a data acquisition unit 201, a station area line loss expression determination unit 202, a statistical line loss equation determination unit 203, a station area fixed loss determination unit 204, and a station area line loss determination unit 205.
Preferably, the data obtaining unit 201 is configured to obtain high-frequency power consumption collection data of high-frequency collection of each user sub-table in a first preset time period, obtain a power supply quantity value of a total table in a second preset time period, and obtain a frozen power consumption of each user sub-table in the second preset time period; the first preset time period comprises a plurality of second preset time periods.
Preferably, wherein the system further comprises: and the data cleaning unit is used for carrying out data format and integrity verification on the power consumption high-frequency acquisition data and cleaning abnormal data with data loss, data abnormality and file error so as to acquire the power consumption high-frequency acquisition data subjected to data cleaning.
Preferably, the second preset time period is one day.
Preferably, the station area line loss expression determining unit 202 is configured to determine a station area line loss expression of the low-voltage station area in each second preset time period based on kirchhoff's law.
Preferably, the expression determining unit 202 for determining the expression of the area line loss of the low-voltage area within each second preset time period based on kirchhoff's law includes:
LL (i) is the line loss of the low-voltage station in the ith second preset time period; phi (phi) j (i m )、U j (i m ) Andrespectively the mth sampling period Δt (i) of the user j in the ith second preset period m ) The electricity consumption measurement value, the voltage and the power factor are obtained by collecting data of the electricity consumption at high frequency; phi (phi) k (i m )、U k (i m ) Andrespectively the mth sampling period Δt (i) of user k in the ith second preset period m ) The electricity consumption measurement value, the voltage and the power factor are obtained by collecting data of the electricity consumption at high frequency; epsilon j And epsilon k The metering errors of the intelligent electric energy meters corresponding to the user j and the user k are respectively; p is the total number of users; alpha jk The equivalent resistance of the common branch between the user j and the user k; q i For the acquisition within the ith second preset time periodThe total number of spots; the second preset time period is equal to q i A sampling period Δt (i m ) And (3) summing.
Preferably, the statistical line loss equation determining unit 203 is configured to determine a statistical line loss equation of the low-voltage transformer area in each second preset period based on a relation among the statistical line loss of the low-voltage transformer area, the transformer area line loss, the transformer area fixed loss, and the power loss caused by errors of all subscriber sub-meters under the transformer area, and the transformer area line loss expression.
Preferably, the statistical line loss equation determining unit 203 determines a statistical line loss equation of the low-voltage transformer area in each second preset time period based on a relation among the statistical line loss of the low-voltage transformer area, the transformer area line loss, the transformer area fixed loss, and the power loss caused by errors of all subscriber sub-meters under the transformer area, and the transformer area line loss expression, including:
wherein, the polynomial on the left of the equal sign is the statistical line loss; the first term to the right of the equal sign is the zone line loss; second term epsilon to the right of the equal sign 0 Fixing loss for the station area; the third item on the right of the equal sign is the electric energy loss caused by the error of all user sub-meters under the transformer area; y (i) is the power supply quantity metering value of the total table of the station area in the ith second preset time period; phi (phi) j (i) And (5) freezing the electricity consumption of the user j in the ith second preset time period.
Preferably, the fixed loss determining unit 204 is configured to establish a set of statistical line loss equations according to the statistical line loss equations of the low-voltage transformer in each second preset time period, and solve the set of statistical line loss equations according to the high-frequency acquisition data of the power consumption, the power supply quantity value and the frozen power consumption, so as to determine the metering error of each user sub-meter, the fixed loss of the transformer area and the equivalent resistance of each branch in the low-voltage transformer area.
Preferably, the station area line loss determining unit 205 is configured to replace a metering error of each user sub-table and an equivalent resistance of each branch in the low-voltage station area into a station area line loss expression of the low-voltage station area in each second preset time period, and determine a station area line loss of the low-voltage station area in each second preset time period.
The system 200 for determining the loss of the low-voltage station area based on the power consumption collection data according to the embodiment of the present invention corresponds to the method 100 for determining the loss of the low-voltage station area based on the power consumption collection data according to another embodiment of the present invention, and is not described herein.
The invention has been described with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed invention are equally possible within the scope of the invention, as defined by the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a/an/the [ means, component, etc. ]" are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.

Claims (10)

1. A method of determining loss of a low voltage station based on power usage acquisition data, the method comprising:
acquiring high-frequency acquisition data of power consumption of each user sub-table in a first preset time period, acquiring a power supply quantity value of a total table in a station area in each second preset time period, and acquiring freezing power consumption of each user sub-table in each second preset time period; the first preset time period comprises a plurality of second preset time periods;
determining a station area line loss expression of the low-voltage station area in each second preset time period based on kirchhoff's law;
determining a statistical line loss equation of the low-voltage station area in each second preset time period based on the relation among the statistical line loss of the low-voltage station area, the station area line loss, the station area fixed loss and the electric energy loss caused by errors of all user sub-meters under the station area and the station area line loss expression;
establishing a statistical line loss equation set according to a statistical line loss equation of the low-voltage station area in each second preset time period, and solving the statistical line loss equation set according to the high-frequency acquisition data of the power consumption, the power supply quantity value and the freezing power consumption so as to determine the metering error of each user sub-meter in the low-voltage station area, the fixed loss of the station area and the equivalent resistance of each branch;
substituting the metering error of each user sub-table and the equivalent resistance of each branch in the low-voltage station area into a station area line loss expression of the low-voltage station area in each second preset time period, and determining the station area line loss of the low-voltage station area in each second preset time period.
2. The method according to claim 1, wherein the method further comprises:
and carrying out data format and integrity verification on the power consumption high-frequency acquisition data, and cleaning abnormal data with data loss, data abnormality and file error to obtain the power consumption high-frequency acquisition data subjected to data cleaning.
3. The method of claim 1, wherein determining an expression of a zone line loss of the low voltage zone for each second preset time period based on kirchhoff's law comprises:
LL (i) is the line loss of the low-voltage station in the ith second preset time period; phi (phi) j (i m )、U j (i m ) Andrespectively the mth sampling period Δt (i) of the user j in the ith second preset period m ) The electricity consumption measurement value, the voltage and the power factor are obtained by collecting data of the electricity consumption at high frequency; phi (phi) k (i m )、U k (i m ) And->Respectively the mth sampling period Δt (i) of user k in the ith second preset period m ) The electricity consumption measurement value, the voltage and the power factor are obtained by collecting data of the electricity consumption at high frequency; epsilon j And epsilon k The metering errors of the intelligent electric energy meters corresponding to the user j and the user k are respectively; p is the total number of users; alpha jk The equivalent resistance of the common branch between the user j and the user k; q i The total number of sampling points in the ith second preset time period is set; the second preset time period is equal to q i A sampling period Δt (i m ) And (3) summing.
4. The method of claim 3, wherein determining the statistical line loss equation for the low voltage transformer area for each second predetermined period of time based on the relationship between the statistical line loss for the low voltage transformer area, the transformer area line loss, the transformer area fixed loss, and the power loss due to errors in all subscriber sub-meters under the transformer area and the transformer area line loss expression, comprises:
wherein the polynomial on the left of the equal sign is statisticalLine loss; the first term to the right of the equal sign is the zone line loss; second term epsilon to the right of the equal sign 0 Fixing loss for the station area; the third item on the right of the equal sign is the electric energy loss caused by the error of all user sub-meters under the transformer area; y (i) is the power supply quantity metering value of the total table of the station area in the ith second preset time period; phi (phi) j (i) And (5) freezing the electricity consumption of the user j in the ith second preset time period.
5. The method of claim 1, wherein the second predetermined period of time is one day.
6. A system for determining line loss and fixed loss for a low voltage station based on power usage acquisition data, the system comprising:
the data acquisition unit is used for acquiring high-frequency acquisition data of the power consumption of each user sub-table in a first preset time period, acquiring the power supply quantity value of the total table in each second preset time period, and acquiring the freezing power consumption of each user sub-table in each second preset time period; the first preset time period comprises a plurality of second preset time periods;
the station area line loss expression determining unit is used for determining a station area line loss expression of the low-voltage station area in each second preset time period based on kirchhoff's law;
a statistical line loss equation determining unit, configured to determine a statistical line loss equation of a low-voltage transformer area in each second preset time period based on a relation among a statistical line loss of the low-voltage transformer area, a transformer area line loss, a transformer area fixed loss, and electric energy loss caused by errors of all user sub-tables under the transformer area, and the transformer area line loss expression;
the station area fixed loss determining unit is used for establishing a statistical line loss equation set according to the statistical line loss equation of the low-voltage station area in each second preset time period, and solving the statistical line loss equation set according to the high-frequency acquisition data of the power consumption, the power supply quantity value and the freezing power consumption so as to determine the metering error of each user sub-meter in the low-voltage station area, the station area fixed loss and the equivalent resistance of each branch;
and the station area line loss determining unit is used for substituting the metering error of each user sub-table in the low-voltage station area and the equivalent resistance of each branch into a station area line loss expression of the low-voltage station area in each second preset time period to determine the station area line loss of the low-voltage station area in each second preset time period.
7. The system of claim 6, wherein the system further comprises:
and the data cleaning unit is used for carrying out data format and integrity verification on the power consumption high-frequency acquisition data and cleaning abnormal data with data loss, data abnormality and file error so as to acquire the power consumption high-frequency acquisition data subjected to data cleaning.
8. The system according to claim 6, wherein the expression determination unit for the zone line loss determines an expression of the zone line loss of the low-voltage zone in each second preset period based on kirchhoff's law, comprising:
LL (i) is the line loss of the low-voltage station in the ith second preset time period; phi (phi) j (i m )、U j (i m ) Andrespectively the mth sampling period Δt (i) of the user j in the ith second preset period m ) The electricity consumption measurement value, the voltage and the power factor are obtained by collecting data of the electricity consumption at high frequency; phi (phi) k (i m )、U k (i m ) And->Respectively isUser k samples the mth sampling period Δt (i) within the ith second preset period m ) The electricity consumption measurement value, the voltage and the power factor are obtained by collecting data of the electricity consumption at high frequency; epsilon j And epsilon k The metering errors of the intelligent electric energy meters corresponding to the user j and the user k are respectively; p is the total number of users; alpha jk The equivalent resistance of the common branch between the user j and the user k; q i The total number of sampling points in the ith second preset time period is set; the second preset time period is equal to q i A sampling period Δt (i m ) And (3) summing.
9. The system according to claim 8, wherein the statistical line loss equation determining unit determines the statistical line loss equation of the low-voltage station in each second preset period based on a relation among the statistical line loss of the low-voltage station, the station line loss, the station fixed loss, and the power loss caused by errors of all subscriber sub-tables under the station, and the station line loss expression, including:
wherein, the polynomial on the left of the equal sign is the statistical line loss; the first term to the right of the equal sign is the zone line loss; second term epsilon to the right of the equal sign 0 Fixing loss for the station area; the third item on the right of the equal sign is the electric energy loss caused by the error of all user sub-meters under the transformer area; y (i) is the power supply quantity metering value of the total table of the station area in the ith second preset time period; phi (phi) j (i) And (5) freezing the electricity consumption of the user j in the ith second preset time period.
10. The system of claim 6, wherein the second predetermined period of time is one day.
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