CN112636370A - Three-phase unbalance adjusting method and device for distribution network low-voltage distribution area - Google Patents
Three-phase unbalance adjusting method and device for distribution network low-voltage distribution area Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The application discloses a distribution network low-voltage distribution area three-phase unbalance adjusting method and device, the single-phase electric energy consumption obtained by the method provided by the application enables technical personnel to clearly know the size of the single-phase electric energy consumption of each phase and information such as electric energy consumption difference among phases, three-phase unbalance adjustment is carried out according to the information, and the technical problem that the load unbalance adjusting efficiency of a distribution network low-voltage distribution area is low due to the fact that existing distribution network three-phase unbalance detection can only count the integral three-phase unbalance degree of a transformer low-voltage outgoing line side, and when load adjustment is actually carried out, operating personnel need to judge how to carry out load adjustment of each phase according to own subjective experience is solved.
Description
Technical Field
The application relates to the technical field of power distribution networks, in particular to a method and a device for adjusting three-phase imbalance of a low-voltage distribution area of a distribution network.
Background
The current power supply mode in China is a three-phase four-wire system, the electricity consumption of residents is taken from one phase or three phases of a transformer, and ideally, the load of each user is divided into three parts equally to be connected into the three phases, so that the load of the transformer is balanced. However, the electricity utilization randomness of residents is large, and with the improvement of living standard, the electric appliances used by users are increasing, and the three-phase load of the transformer is often in an unbalanced state. The phenomenon is particularly obvious in urban villages and rural areas in summer, and the air conditioner load is increased rapidly in summer, so that the overload tripping and power failure of a low-voltage switch are caused due to the overload of a certain phase line. The problem of three-phase unbalance of the transformer is not accompanied by transformer overload, and in order to fully utilize the capacity of the transformer, an operator needs to adjust a household meter from one phase with overweight load to one phase with lighter load so as to achieve the purposes of balancing and maximally utilizing a line.
However, the imbalance of the distribution network low-voltage area is not limited to three-phase imbalance, and also exists in imbalance among branches, and only the overall three-phase imbalance of the transformer low-voltage outgoing line side can be counted according to the existing distribution network three-phase imbalance detection mode, so that when load adjustment is actually performed, an operator needs to judge how to perform load adjustment of each phase according to own subjective experience, and the technical problem that the load imbalance adjustment efficiency of the distribution network low-voltage area is low at present is caused.
Disclosure of Invention
The application provides a three-phase imbalance adjusting method and device for a distribution network low-voltage distribution area, which are used for solving the technical problem that the load imbalance adjusting efficiency of the distribution network low-voltage distribution area is low at present.
In view of this, the present application provides, in a first aspect, a method for adjusting three-phase imbalance in a low-voltage distribution area of a distribution network, including:
acquiring electric energy data of a low-voltage wire outlet side of a target station area, and the household meter type and the household meter reading of the target station area;
according to the electric energy data and the phase type of the user meter, combining a preset phase type of the user meter and a load component analysis mode to obtain phase attribution information of each user meter and load component information of the user meter, wherein the load component information is a load proportion among the phase types in each phase accessed by the user meter;
respectively calculating the single-phase electric energy consumption of each phase by combining the readings of the household meters according to the phase attribution information and the load component information;
and adjusting the three-phase unbalance degree of the target platform area in a load transfer mode of a household meter according to the single-phase electric energy consumption.
Preferably, the adjusting the three-phase unbalance degree of the target platform area by means of user meter load transfer according to each single-phase power consumption specifically includes:
and calculating the average three-phase electric energy consumption according to the single-phase electric energy consumption, respectively obtaining the electric energy adjustment quantity of each phase according to the difference value between the single-phase electric energy consumption and the average three-phase electric energy consumption, and adjusting the three-phase unbalance degree of the target platform area in a load transfer mode according to the electric energy adjustment quantity.
Preferably, before the calculating the single-phase electric energy consumption of each phase according to the phase attribution information and the load component information and by combining the user meter reading, the method further includes:
acquiring user list shunt attribution information of the target station area;
the calculating the single-phase electric energy consumption of each phase according to the phase attribution information and the load component information by combining the readings of the household meter specifically comprises the following steps:
respectively calculating the single-phase electric energy consumption of each phase in each branch circuit under the target station area according to the phase class attribution information, the branch circuit attribution information of the user meter and the load component information by combining the reading of the user meter;
the adjusting the three-phase unbalance degree of the target platform area in a load transfer manner of the household meter according to the single-phase power consumption specifically comprises:
calculating the three-phase average electric energy consumption of the branch according to the total electric energy consumption of each branch, obtaining the electric energy adjustment quantity of each phase in the branch according to the difference value between the single-phase electric energy consumption and the three-phase average electric energy consumption, and adjusting the three-phase unbalance of each branch in the target station area one by one in a load transfer mode of a user meter according to each electric energy adjustment quantity.
Preferably, the calculating, according to the phase class attribution information, the subscriber meter branch attribution information, and the load component information, and in combination with the subscriber meter reading, each branch under the target station area, further includes, after the single-phase power consumption of each phase:
respectively obtaining the shunt capacity utilization rate of each shunt according to the ratio of the total shunt electric energy consumption to the shunt rated electric energy consumption, wherein the total shunt electric energy consumption is the sum of the single-phase electric energy consumption in the shunt, and the shunt rated electric energy consumption is the electric energy consumption of the shunt under the rated operation condition;
and respectively obtaining the load adjustment quantity of each branch according to the difference value of the branch capacity utilization rate of each branch and the average value of the branch capacity utilization rate, so that the capacity utilization rate of each branch can be conveniently adjusted in a user meter load transfer mode according to the load adjustment quantity.
Preferably, the method for analyzing the load components of the phase and each phase of the user meter specifically comprises the following steps: the analysis mode of single-phase user meter phase and load component, the analysis mode of three-phase user meter phase and load component or the analysis mode of composite user meter phase and load component.
The application second aspect provides a join in marriage net low pressure platform district unbalanced three phase adjusting device, includes:
the data acquisition unit is used for acquiring electric energy data of a low-voltage outgoing line side of a target station area, and the household meter phase type and the household meter reading of the target station area;
a user meter phase and load component analysis unit, configured to obtain phase attribution information of each user meter and load component information of the user meter according to the electric energy data and the user meter phase type in combination with a preset user meter phase and load component analysis manner, where the load component information is a load ratio between each phase in each phase accessed by the user meter;
the single-phase electric energy consumption calculating unit is used for calculating the single-phase electric energy consumption of each phase according to the phase attribution information and the load component information and by combining the readings of the household meter;
and the three-phase unbalance degree adjusting unit is used for adjusting the three-phase unbalance degree of the target platform area in a load transfer mode of the household meter according to the single-phase electric energy consumption.
Preferably, the three-phase imbalance degree adjusting unit is specifically configured to:
calculating the average three-phase electric energy consumption according to each single-phase electric energy consumption;
and obtaining electric energy adjustment quantities of each phase according to the difference value between the single-phase electric energy consumption and the three-phase average electric energy consumption, and adjusting the three-phase unbalance degree of the target platform area in a load transfer mode of a household meter according to the electric energy adjustment quantities.
Preferably, the method further comprises the following steps:
the subscriber meter shunt attribution information acquiring unit is used for acquiring the subscriber meter shunt attribution information of the target station area;
the single-phase electric energy consumption calculating unit is specifically configured to:
respectively calculating the single-phase electric energy consumption of each phase in each branch circuit under the target station area according to the phase class attribution information, the branch circuit attribution information of the user meter and the load component information by combining the reading of the user meter;
the three-phase unbalance adjusting unit is specifically configured to:
calculating the three-phase average electric energy consumption of the branch according to the total electric energy consumption of each branch, obtaining the electric energy adjustment quantity of each phase in the branch according to the difference value between the single-phase electric energy consumption and the three-phase average electric energy consumption, and adjusting the three-phase unbalance of each branch in the target station area one by one in a load transfer mode of a user meter according to each electric energy adjustment quantity.
Preferably, the method further comprises the following steps:
the shunt capacity utilization rate calculation unit is used for respectively obtaining the shunt capacity utilization rate of each shunt according to the ratio of the total shunt electric energy consumption to the shunt rated electric energy consumption, wherein the total shunt electric energy consumption is the sum of the single-phase electric energy consumption in the shunt, and the shunt rated electric energy consumption is the electric energy consumption of the shunt under the rated operation condition;
and the branch load transfer unit is used for respectively obtaining the load adjustment quantity of each branch according to the difference value of the branch capacity utilization rate of each branch and the average value of the branch capacity utilization rate, so that the capacity utilization rate of each branch can be conveniently adjusted in a user meter load transfer mode according to the load adjustment quantity.
Preferably, the method for analyzing the load components of the phase and each phase of the user meter specifically comprises the following steps: the analysis mode of single-phase user meter phase and load component, the analysis mode of three-phase user meter phase and load component or the analysis mode of composite user meter phase and load component.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a three-phase unbalance adjusting method for a distribution network low-voltage distribution area, which comprises the following steps: acquiring electric energy data of a low-voltage wire outlet side of a target station area, and the household meter type and the household meter reading of the target station area; according to the electric energy data and the phase type of the user meter, combining a preset phase type of the user meter and a load component analysis mode to obtain phase attribution information of each user meter and load component information of the user meter, wherein the load component information is a load proportion among the phase types in each phase accessed by the user meter; respectively calculating the single-phase electric energy consumption of each phase by combining the readings of the household meters according to the phase attribution information and the load component information; and adjusting the three-phase unbalance degree of the target platform area in a load transfer mode of a household meter according to the single-phase electric energy consumption.
According to the single-phase electric energy consumption obtained by the method, technicians can clearly know the size of the single-phase electric energy consumption of each phase and information such as electric energy consumption difference among phases, three-phase imbalance adjustment is carried out according to the information, and the technical problem that the load imbalance adjustment efficiency of a distribution network low-voltage distribution area is low due to the fact that an operator needs to judge how to carry out load adjustment of each phase according to own subjective experience when load adjustment is actually carried out due to the fact that the existing distribution network three-phase imbalance detection can only count the overall three-phase imbalance of the transformer low-voltage outlet side is solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic flowchart of a method for adjusting three-phase imbalance in a distribution network low-voltage distribution area according to a first embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a method for adjusting three-phase imbalance in a distribution network low-voltage distribution area according to a second embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a first embodiment of a distribution network low-voltage distribution area three-phase imbalance adjusting device provided by the present application.
Fig. 4 is a schematic structural diagram of a first embodiment of a subscriber list access in a distribution network low-voltage station area provided in the present application;
fig. 5 is a schematic structural diagram of a second embodiment of a subscriber list access in a distribution network low-voltage station area provided in the present application;
fig. 6 is a schematic structural diagram of a third embodiment of a user table access of a distribution network low-voltage station area provided in the present application;
fig. 7 is a schematic structural diagram of a fourth embodiment of a subscriber list access in a distribution network low-voltage station area provided in the present application;
fig. 8 is a schematic structural diagram of a fifth embodiment of a distribution network low-voltage station area subscriber table access provided in the present application;
fig. 9 is a schematic structural diagram of a sixth embodiment of a distribution network low-voltage station area subscriber meter access provided by the present application.
Detailed Description
The existing three-phase unbalance detection work of the power distribution network is carried out by depending on the identification of instrument or experience by field operators on the phase of a household meter and the rough estimation of load, the load is estimated by the number of air conditioner external units used by residents on the field approximately, only the integral three-phase unbalance degree of the low voltage outlet line side of the transformer can be counted, accurate data support is not available, the three-phase unbalance degree is not refined enough, and the field experience is relied on, so that the operators need to judge how to carry out load adjustment on each phase according to own subjective experience when carrying out load adjustment actually, the time is consumed, and the technical problem that the load unbalance adjustment efficiency of the low voltage distribution area of the distribution network
The embodiment of the application provides a method and a device for adjusting three-phase imbalance of a distribution network low-voltage distribution area, which are used for solving the technical problem of low efficiency of adjusting load imbalance of the distribution network low-voltage distribution area at present.
In order to make the objects, features and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
Referring to fig. 1, a first embodiment of the present application provides a method for adjusting three-phase imbalance in a low-voltage distribution area of a distribution network, including:
102, obtaining phase attribution information of each user meter and load component information of the user meter by combining a preset user meter phase and load component analysis mode according to the electric energy data and the user meter phase type, wherein the load component information is the electric energy consumption proportion among each phase in each phase accessed by the user meter.
It should be noted that, according to different access types of the user table in the target station area, the user table phase and the load component analysis method in this embodiment may specifically be divided into: the analysis mode of single-phase user meter phase and load component, the analysis mode of three-phase user meter phase and load component or the analysis mode of composite user meter phase and load component.
1) The present embodiment illustrates an example of a single-phase user meter phase category and load component analysis manner as follows:
according to the line structure of the distribution network area shown in fig. 4, it is assumed that a schematic diagram of a low-voltage power supply network is shown as follows, all users in the transformer area are assumed to be single-phase system users, and total n users are assumed, that is, the total number of the user meters is n. Assuming that the time difference of each time period is Δ t, the single-phase total active data of the low-voltage outgoing line position (at the measuring device M) of the transformer can be obtained by the metering system from M different time periods, and the three-phase total active data of n household meters can be obtained from M different time periods.
And generating a data matrix by using the obtained single-phase total active data of different time periods and the three-phase total active data of each household meter according to a certain rule. For example, the single-phase total active data of different time periods may generate the following data matrix Z:
the first row of data in the data matrix Z is A-phase total active data of each time period, the second row of data is B-phase total active data of each time period, the third row of data is C-phase total active data of each time period, and WTotal of A t1Is the total active data of phase a in the t1 time period.
The three-phase total active data of each user table in different time periods can generate a data matrix P as follows:
wherein, Wn·tmAnd the three-phase total active data is the tm time section of the nth user table.
According to the kirchhoff current theorem and the energy conservation theorem, a relational expression of single-phase total active data and three-phase total active data of each household meter is established, wherein the relational expression is as follows:
GP＝Z；
calculating according to the relation to obtain the home matrix of the user table, when m is n, P is square matrix, there is inverse matrix, i.e. G is ZP-1；
The dimension of the obtained user table attribution matrix G is 3 x n. Determining the phase of each user table according to the position of the numerical value 1 in each column of data of the home matrix of the user table, wherein only 1 numerical value in each column of the home matrix G of the user table is 1, the rest numerical values are 0, and if the position of the 1 in each column is positioned in the first row, the user table is a phase A, the user table is positioned in a phase B of the second row, and the user table is positioned in a phase C of the third row. Wherein, the data of the nth column in the user table attribution matrix G represents the nth user table.
2) The present embodiment illustrates an example of a three-phase user meter phase category and load component analysis manner as follows:
according to the structure shown in fig. 5, all users under the transformer area are assumed to be three-phase four-wire users, and a total of n users, that is, the total number of the user table is n. And setting the time difference of each time period as delta t, acquiring single-phase total active data of the low-voltage outgoing line position of the transformer from m different time periods by the metering system, and acquiring three-phase total active data of n household meters from m different time periods.
And generating a data matrix by using the obtained single-phase total active data of different time periods and the three-phase total active data matrix of each household meter according to a certain rule. For example, the single-phase total active data of different time periods may generate the following data matrix Z:
the first row of data in the data matrix Z is A-phase total active data of each time period, the second row of data is B-phase total active data of each time period, the third row of data is C-phase total active data of each time period, and WTotal of A t1Is the total active data of phase a in the t1 time period.
The three-phase total active data of each user table in different time periods can generate a data matrix P as follows:
wherein, Wn·tmAnd the three-phase total active data is the tm time section of the nth user table.
According to the kirchhoff current theorem and the energy conservation theorem, a relational expression of single-phase total active data and three-phase total active data of each household meter is established, wherein the relational expression is as follows:
GP＝Z；
calculating according to the relation to obtain the load component matrix of the user table, when m is equal to n, P is reversible, G is equal to ZP-1(ii) a The dimension of the obtained user table load component matrix G is 3 x n.
And determining the load component distribution condition of each user table based on the user table load component matrix G. Specifically, the load component distribution condition of each user meter is determined based on numerical values in each column of data in the load component matrix of the user meter, wherein each data in the load component matrix G of the user meter represents the distribution proportion of the electric energy, and the sum of each column of data is 1. For example, if the nth column data in the load component matrix of the user meter is [0.6,0.3,0.1] T, it represents that 60% of the electric energy consumed by the nth user meter is consumed by the a phase, 30% is consumed by the B phase, and 10% is consumed by the C phase, so as to determine the load component distribution of the nth user meter.
3) The present embodiment illustrates an example of a composite user table phase and load component analysis manner as follows:
according to the structure shown in fig. 6, it is assumed that users under the transformer area include three-phase four-wire system users and single-phase system users, and it is assumed that the number of single-phase system users is j, the number of three-phase four-wire system users is k, and j + k is n users in total. And setting the time difference of each time period as delta t, acquiring single-phase total active data of the low-voltage outgoing line position of the transformer from m different time periods by the metering system, and acquiring three-phase total active data of n household meters from m different time periods.
And generating a data matrix by using the obtained single-phase total active data of different time periods and the three-phase total active data matrix of each household meter according to a certain rule. For example, the single-phase total active data of different time periods may generate the following data matrix Z:
the first row of data in the data matrix Z is A-phase total active data of each time period, the second row of data is B-phase total active data of each time period, the third row of data is C-phase total active data of each time period, and WTotal of A t1Is the total active data of phase a in the t1 time period.
The three-phase total active data of each user table in different time periods can generate a data matrix P as follows:
wherein, Wn·tmAnd the three-phase total active data is the tm time section of the nth user table.
According to the kirchhoff current theorem and the power conservation theorem, a relational expression of single-phase total active data and three-phase total active data of each household meter is established, wherein the relational expression is as follows:
GP＝Z；
calculating according to the relation to obtain the load component matrix of the user table, when m is n, the P matrix is reversible, then G is ZP-1(ii) a The dimension of the obtained load component matrix G of the user table is3×n。
And determining the phase or load component distribution condition of each user table based on the user table load component matrix G. Specifically, when only one numerical value in the data of the x-th column in the load component matrix G of the user table is "1" and the remaining numerical values are "0", the user of the user table corresponding to the x-th column is a single-phase user making table, the user table is a single-phase user making table, and when "1" in the data of the x-th column is located in the first row, the user table is an a-phase; if "1" in the x-row data is in the second row, it means that the user table is phase B, and if "1" in the x-row data is in the third row, it means that the user table is phase C. And when the three numerical values in the data of the x-th column in the load component matrix G of the user meter are not 0 and the sum of the numerical values in the data of the x-th column is 1, the user of the user meter corresponding to the x-th column is a three-phase four-wire system user meter, the user meter is a three-phase four-wire system user meter, and each data in each column represents the distribution proportion of the electric energy. For example, if the x-th column data in the load component matrix of the user meter is [0.6,0.3,0.1] T, it represents that 60% of the electric energy consumed by the x-th user meter is consumed by the a phase, 30% of the electric energy consumed by the B phase and 10% of the electric energy consumed by the C phase, and thus the load component distribution of the user meter x is determined.
And 103, respectively calculating the single-phase electric energy consumption of each phase according to the phase attribution information and the load component information and by combining the readings of the user meter.
It should be noted that, based on the attribution information and the load component information of the user meter in the target station area obtained in the above steps, the single-phase power consumption W of each phase in the target station area can be calculated by combining the user meter reading of each user meter in the station areajWherein j represents any one of the three phases.
And step 104, adjusting the three-phase unbalance degree of the target platform area in a load transfer mode of the household meter according to the single-phase electric energy consumption.
Further, the implementation of step 104 of this embodiment may refer to the following ways:
and calculating the three-phase average electric energy consumption according to each single-phase electric energy consumption, respectively obtaining each phase electric energy adjustment amount according to the difference value between each single-phase electric energy consumption and the three-phase average electric energy consumption, and adjusting the three-phase unbalance degree of the target platform area in a load transfer mode according to each electric energy adjustment amount.
It should be noted that, as can be understood from the standard calculation method of the three-phase imbalance, the single-phase power consumption is calculated according to step 103, that is, the single-phase power consumption of each phase and the difference between the maximum power consumption and the minimum power consumption can be known clearly, the phase with the maximum load and the phase with the minimum load in the target station area can also be determined according to the maximum power consumption and the minimum power consumption, and the operator can adjust the three-phase imbalance of the target station area according to the information in a load transfer manner of the user meter without depending on the experience of the operator.
The above is a detailed description of a first embodiment of a method for adjusting three-phase imbalance of a distribution network low-voltage distribution area provided by the present application, and the following is a detailed description of a second embodiment of the method for adjusting three-phase imbalance of a distribution network low-voltage distribution area provided by the present application.
Referring to fig. 2, based on the first embodiment, a second embodiment of the present application provides a method for adjusting three-phase imbalance in a distribution network low-voltage distribution area, including:
It should be noted that step 201 and step 202 in this embodiment are the same as step 101 and step 102 in the first embodiment, and are not described again here.
And step 204, respectively calculating the single-phase electric energy consumption of each phase in each branch circuit under the target station area according to the phase class attribution information, the branch circuit attribution information of the user meter and the load component information by combining the reading of the user meter.
It should be noted that, in order to further improve the accuracy of adjusting the three-phase imbalance of the station area, in this embodiment, the branch to which each subscriber table belongs may be determined according to the branch attribution information of the subscriber table of the target station area by further obtaining the branch attribution information of the subscriber table of the target station area.
And then, respectively calculating the single-phase electric energy consumption of each phase in each branch circuit under the target station area according to the phase class attribution information, the branch circuit attribution information of the user meter and the load component information by combining the reading of the user meter.
And step 205, obtaining the shunt capacity utilization rate of each shunt according to the ratio of the total shunt electric energy consumption to the shunt rated electric energy consumption, wherein the total shunt electric energy consumption is the sum of single-phase electric energy consumption in the shunt, and the shunt rated electric energy consumption is the electric energy consumption of the shunt under the rated operation condition.
And step 206, respectively obtaining the load adjustment quantity of each branch according to the difference value between the branch capacity utilization rate of each branch and the average value of the branch capacity utilization rate, so as to adjust the capacity utilization rate of each branch in a user meter load transfer mode according to the load adjustment quantity.
It should be noted that, step 205 and step 206 in this embodiment belong to optional steps, and based on the single-phase electric energy consumption of each phase in each branch calculated in step 204, the branch capacity utilization rate of each branch is obtained according to the ratio of the total electric energy consumption of the branch to the rated electric energy consumption of the branch, and according to the branch capacity utilization rate, the user meter can be transferred from the branch with the higher branch capacity utilization rate to the branch with the lower branch capacity utilization rate, so as to implement the capacity balance of each branch.
And finally, calculating the average three-phase electric energy consumption of the branch according to the total electric energy consumption of each branch, calculating to obtain the electric energy adjustment quantity of each phase in the branch, and adjusting the three-phase unbalance degree of each branch in the target platform area one by one according to each electric energy adjustment quantity in a load transfer mode of a user meter. Therefore, the three-phase balance of each branch of the target platform area is realized, and the aim of the integral three-phase balance of the target platform area is fulfilled.
In order to more specifically explain the technical solution of the present application, the following description will be made with reference to example data.
Taking the power supply system structure shown in fig. 7 as an example, the low-voltage part of the system has three branches, each branch has 6 single-phase users and 2 three-phase four-wire users, and the load component distribution conditions of the attribution of each single-phase user meter and the three-phase four-wire user meter are obtained by the analysis and calculation method of the phase and the component of the composite component system user meter, and the connection conditions are shown in fig. 7.
The electric energy data measured by each user meter in the illustrated system is shown in table 1:
table 1 electric energy data measured by each household meter
According to the attribution of the single-phase household meter and the load component distribution condition of the three-phase four-wire household meter, the electric energy data are arranged according to different phases and different branches, and the result is shown in table 2:
table 2 shows the results of arranging the electric energy data according to different phases and different branches
According to the calculation formula of the unbalance:
the three-phase unbalance of the outgoing line positions of the shunt switches and the transformer can be obtained, wherein the phase W with the largest power consumptioni·maxThe smallest phase Wi·minAnd three-phase mean value Wi·avgWhere "i" represents the ith branch, the results are shown in Table 3:
TABLE 3 target pad shunt imbalance
Therefore, if the three-phase unbalance degree at the outgoing line of the transformer is taken as a basis, the unbalance degree of the transformer area does not reach an early warning value (25%), but the three-phase unbalance degree of each branch exceeds 25% and reaches 101.69% as high as possible. In order to drive the three-phase load to be balanced, part of the single-phase household meters need to be adjusted from the phase with the heavy load to the phase with the light load, and the adjustment amount of each phase is as follows:
ΔW(A,B,C)＝W(A,B,C)-Wavg
can calculate conveniently:
because the load of the branch circuit 2 is heavy, in actual work, the power supply department can preferentially adjust the branch circuit, because the load component distribution of the three-phase four-wire system user is determined by the inside of the user, the power supply department can only adjust a single-phase user, according to the calculation result, the B phase in the branch circuit 2 needs to be adjusted to the A phase by 22kwh, the C phase needs to be adjusted to the A phase by 26kwh, namely the user 13 and the user 14 are adjusted to the A phase, the adjusted low-voltage network diagram is shown in fig. 8, and the adjusted three-phase imbalance degree is shown in table 4:
TABLE 4 three-phase unbalance of each branch after first adjustment
Although the three-phase unbalance degree of the outgoing line side of the transformer is greatly reduced, the three-phase unbalance phenomenon of each shunt switch still exists, and at the moment, the steps can be executed circularly according to the same steps until the three-phase unbalance degree of each shunt meets the specification;
for example, the flow of the adjustment policy is as follows:
(1) and calculating the three-phase unbalance degree of the low voltage outgoing line side of the transformer before adjustment.
(2) And calculating three-phase electric energy data and average electric energy at the low-voltage outgoing line position of the transformer.
(3) Finding out the branch with the heaviest load, and calculating the branch adjustment quantity delta W (A, B, C) -Wavg
(4) And recalculating the three-phase unbalance degree of the low voltage outlet line side of the adjusted transformer.
(5) An evaluation is made.
The transformer is composed of loads of all branches, if the loads of all branches can be adjusted to be balanced, the three-phase unbalance degree at the outgoing line of the transformer can be automatically adjusted, and the calculation formula of the adjustment amount of all branches is still delta W(A,B,C)＝W(A,B,C)-WavgThe method comprises the following steps:
(1) and calculating the three-phase unbalance degree of the low voltage outgoing line side and each branch of the transformer before adjustment.
(2) And calculating three-phase electric energy data and average electric energy of each branch of the transformer.
(3) Calculating each shunt adjustment amount Δ W(A,B,C)＝W(A,B,C)-Wavg
(4) And recalculating the three-phase unbalance degree of the low voltage outgoing line side and each branch of the adjusted transformer.
(5) An evaluation is made.
Branch 1
Branch 2
Branch 3
Namely, branch 1: adjusting the user 3 to the phase A and the user 5 to the phase C; branch 2: user 10 adjusts to C, user 14 adjusts to a; branch 3: the user 20, adjust to B, the adjusted low voltage network diagram is shown in fig. 9, and the adjusted unbalance degrees of the three phases are shown in table 5:
TABLE 5 final adjusted three-phase unbalance of each branch
Therefore, the method can adjust the three-phase unbalance of the shunt switch and automatically adjust the three-phase unbalance value at the outgoing line of the transformer, so that the whole low-voltage network operates in a healthy state.
The above is a detailed description of a second embodiment of the method for adjusting three-phase imbalance of the distribution network low-voltage distribution room provided by the present application, and the following is a detailed description of the method for adjusting three-phase imbalance of the distribution network low-voltage distribution room provided by the present application.
Referring to fig. 3, a second embodiment of the present application provides a device for adjusting three-phase imbalance in a distribution network low-voltage distribution area, including:
the data acquisition unit 301 is configured to acquire electric energy data on a low-voltage outgoing line side of the target station area, and a household meter phase type and a household meter reading of the target station area;
a user meter phase and load component analysis unit 302, configured to obtain phase attribution information of each user meter and load component information of each user meter according to the electric energy data and the user meter phase type by combining a preset user meter phase and load component analysis manner, where the load component information is a load ratio between each phase in each phase accessed by the user meter;
the single-phase electric energy consumption calculating unit 303 is configured to calculate single-phase electric energy consumption of each phase according to the phase class attribution information and the load component information, in combination with the user meter reading;
and a three-phase unbalance degree adjusting unit 304, configured to adjust the three-phase unbalance degree of the target platform area in a load transfer manner according to each single-phase power consumption.
Further, the three-phase imbalance degree adjusting unit 304 is specifically configured to:
calculating the average three-phase electric energy consumption according to each single-phase electric energy consumption;
and respectively obtaining electric energy adjustment quantity of each phase according to the difference value between the single-phase electric energy consumption and the three-phase average electric energy consumption, and adjusting the three-phase unbalance degree of the target platform area in a load transfer mode of the household meter according to each electric energy adjustment quantity.
Further, still include:
a subscriber meter shunt affiliation information obtaining unit 300, configured to obtain subscriber meter shunt affiliation information of a target cell;
the single-phase power consumption calculation unit 303 is specifically configured to:
respectively calculating the single-phase electric energy consumption of each phase in each branch under a target station area according to the phase class attribution information, the branch attribution information of the user meter and the load component information by combining the reading of the user meter;
the three-phase unbalance degree adjusting unit 304 is specifically used for:
and calculating the three-phase average electric energy consumption of the branch according to the total electric energy consumption of each branch, respectively obtaining the electric energy adjustment quantity of each phase in the branch according to the difference value between the single-phase electric energy consumption and the three-phase average electric energy consumption, and adjusting the three-phase unbalance of each branch in the target platform area one by one in a load transfer mode of a household meter according to each electric energy adjustment quantity.
Further, still include:
the shunt capacity utilization rate calculating unit 3001 is configured to obtain a shunt capacity utilization rate of each shunt according to a ratio of a total shunt electric energy consumption to a rated shunt electric energy consumption, where the total shunt electric energy consumption is a sum of single-phase electric energy consumption in the shunt, and the rated shunt electric energy consumption is an electric energy consumption of the shunt under a rated operating condition;
the branch load transfer unit 3002 is configured to obtain a load adjustment amount of each branch according to a difference between the branch capacity utilization rate of each branch and the average of the branch capacity utilization rates, so as to adjust the capacity utilization rate of each branch in a user meter load transfer manner according to the load adjustment amount.
Further, the method for analyzing the load components of the phase difference and each phase difference of the user meter specifically comprises the following steps: the analysis mode of single-phase user meter phase and load component, the analysis mode of three-phase user meter phase and load component or the analysis mode of composite user meter phase and load component.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
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 units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. 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.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should 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 in the embodiments of the present application.
Claims (10)
1. A three-phase unbalance adjusting method for a distribution network low-voltage distribution area is characterized by comprising the following steps:
acquiring electric energy data of a low-voltage wire outlet side of a target station area, and the household meter type and the household meter reading of the target station area;
according to the electric energy data and the phase type of the user meter, combining a preset phase type of the user meter and a load component analysis mode to obtain phase attribution information of each user meter and load component information of the user meter, wherein the load component information is a load proportion among the phase types in each phase accessed by the user meter;
respectively calculating the single-phase electric energy consumption of each phase by combining the readings of the household meters according to the phase attribution information and the load component information;
and adjusting the three-phase unbalance degree of the target platform area in a load transfer mode of a household meter according to the single-phase electric energy consumption.
2. The method according to claim 1, wherein the step of adjusting the three-phase imbalance of the target distribution area by means of load transfer of a household meter according to the single-phase power consumption specifically comprises:
and calculating the average three-phase electric energy consumption according to the single-phase electric energy consumption, respectively obtaining the electric energy adjustment quantity of each phase according to the difference value between the single-phase electric energy consumption and the average three-phase electric energy consumption, and adjusting the three-phase unbalance degree of the target platform area in a load transfer mode according to the electric energy adjustment quantity.
3. The method of claim 1, wherein before calculating the single-phase power consumption of each phase according to the phase attribution information and the load component information and by combining the readings of the user meter, the method further comprises:
acquiring user list shunt attribution information of the target station area;
the calculating the single-phase electric energy consumption of each phase according to the phase attribution information and the load component information by combining the readings of the household meter specifically comprises the following steps:
respectively calculating the single-phase electric energy consumption of each phase in each branch circuit under the target station area according to the phase class attribution information, the branch circuit attribution information of the user meter and the load component information by combining the reading of the user meter;
the adjusting the three-phase unbalance degree of the target platform area in a load transfer manner of the household meter according to the single-phase power consumption specifically comprises:
calculating the three-phase average electric energy consumption of the branch according to the total electric energy consumption of each branch, obtaining the electric energy adjustment quantity of each phase in the branch according to the difference value between the single-phase electric energy consumption and the three-phase average electric energy consumption, and adjusting the three-phase unbalance of each branch in the target station area one by one in a load transfer mode of a user meter according to each electric energy adjustment quantity.
4. The method according to claim 3, wherein the step of calculating the single-phase power consumption of each phase in each branch in the target distribution area according to the phase class attribution information, the branch attribution information of the user meter, and the load component information in combination with the reading of the user meter further comprises:
respectively obtaining the shunt capacity utilization rate of each shunt according to the ratio of the total shunt electric energy consumption to the shunt rated electric energy consumption, wherein the total shunt electric energy consumption is the sum of the single-phase electric energy consumption in the shunt, and the shunt rated electric energy consumption is the electric energy consumption of the shunt under the rated operation condition;
and respectively obtaining the load adjustment quantity of each branch according to the difference value of the branch capacity utilization rate of each branch and the average value of the branch capacity utilization rate, so that the capacity utilization rate of each branch can be conveniently adjusted in a user meter load transfer mode according to the load adjustment quantity.
5. The method for adjusting the three-phase imbalance of the distribution network low-voltage distribution area according to claim 1, wherein the analysis mode of the load components of the user meter phase and each phase specifically comprises the following steps: the analysis mode of single-phase user meter phase and load component, the analysis mode of three-phase user meter phase and load component or the analysis mode of composite user meter phase and load component.
6. The utility model provides a join in marriage net low pressure platform district unbalanced three phase adjusting device which characterized in that includes:
the data acquisition unit is used for acquiring electric energy data of a low-voltage outgoing line side of a target station area, and the household meter phase type and the household meter reading of the target station area;
a user meter phase and load component analysis unit, configured to obtain phase attribution information of each user meter and load component information of the user meter according to the electric energy data and the user meter phase type in combination with a preset user meter phase and load component analysis manner, where the load component information is a load ratio between each phase in each phase accessed by the user meter;
the single-phase electric energy consumption calculating unit is used for calculating the single-phase electric energy consumption of each phase according to the phase attribution information and the load component information and by combining the readings of the household meter;
and the three-phase unbalance degree adjusting unit is used for adjusting the three-phase unbalance degree of the target platform area in a load transfer mode of the household meter according to the single-phase electric energy consumption.
7. The device for adjusting three-phase imbalance of a distribution network low-voltage area according to claim 6, wherein the three-phase imbalance adjusting unit is specifically configured to:
calculating the average three-phase electric energy consumption according to each single-phase electric energy consumption;
and obtaining electric energy adjustment quantities of each phase according to the difference value between the single-phase electric energy consumption and the three-phase average electric energy consumption, and adjusting the three-phase unbalance degree of the target platform area in a load transfer mode of a household meter according to the electric energy adjustment quantities.
8. The device of claim 6, further comprising:
the subscriber meter shunt attribution information acquiring unit is used for acquiring the subscriber meter shunt attribution information of the target station area;
the single-phase electric energy consumption calculating unit is specifically configured to:
respectively calculating the single-phase electric energy consumption of each phase in each branch circuit under the target station area according to the phase class attribution information, the branch circuit attribution information of the user meter and the load component information by combining the reading of the user meter;
the three-phase unbalance adjusting unit is specifically configured to:
calculating the three-phase average electric energy consumption of the branch according to the total electric energy consumption of each branch, obtaining the electric energy adjustment quantity of each phase in the branch according to the difference value between the single-phase electric energy consumption and the three-phase average electric energy consumption, and adjusting the three-phase unbalance of each branch in the target station area one by one in a load transfer mode of a user meter according to each electric energy adjustment quantity.
9. The device of claim 8, further comprising:
the shunt capacity utilization rate calculation unit is used for respectively obtaining the shunt capacity utilization rate of each shunt according to the ratio of the total shunt electric energy consumption to the shunt rated electric energy consumption, wherein the total shunt electric energy consumption is the sum of the single-phase electric energy consumption in the shunt, and the shunt rated electric energy consumption is the electric energy consumption of the shunt under the rated operation condition;
and the branch load transfer unit is used for respectively obtaining the load adjustment quantity of each branch according to the difference value of the branch capacity utilization rate of each branch and the average value of the branch capacity utilization rate, so that the capacity utilization rate of each branch can be conveniently adjusted in a user meter load transfer mode according to the load adjustment quantity.
10. The device of claim 5, wherein the means for analyzing the load components of the individual phases and phases of the household meter specifically comprises: the analysis mode of single-phase user meter phase and load component, the analysis mode of three-phase user meter phase and load component or the analysis mode of composite user meter phase and load component.
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