CN110729724A - Automatic low-voltage distribution area topology identification method - Google Patents
Automatic low-voltage distribution area topology identification method Download PDFInfo
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- CN110729724A CN110729724A CN201911022275.4A CN201911022275A CN110729724A CN 110729724 A CN110729724 A CN 110729724A CN 201911022275 A CN201911022275 A CN 201911022275A CN 110729724 A CN110729724 A CN 110729724A
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The invention discloses a method for automatically identifying the topology of a low-voltage distribution area, which comprises the steps of dividing a topological structure of the low-voltage distribution area into three layers, then collecting current values and equipment IDs of three topological levels at the same time, respectively corresponding the collected current values to the three levels according to the collected equipment IDs, and sequentially determining the corresponding relation among the three levels according to the current values which are divided into the levels. The invention can realize the automatic identification of the topological structure in the power distribution area, and can also automatically identify the change when the topological structure changes so as to correspondingly modify the topological structure. The device ID is only configured according to the device type in advance, excessive topological structure information is not required to be known in advance, and the method has the advantages of simplicity and easiness in operation.
Description
Technical Field
The invention relates to a low-voltage distribution area topology automatic identification method, and belongs to the technical field of electric low-voltage distribution networks.
Background
The low-voltage distribution network plays a role in distributing electric energy in the power grid, is a key link for transmitting electric energy to users, and is a basic link for realizing the smart power grid. The topological structure of the power line in the low-voltage distribution cabinet, the park building branch box and the unit family meter box in the park is accurately and quickly identified, the method is the basis for realizing the lean management functions of calculation of line loss in the power distribution station, three-phase power unbalance management, power failure fault study and judgment and the like, and is the premise for realizing the intellectualization of the power distribution station. However, the low-voltage distribution room has the characteristics of large number of users, complex electrical wiring, various loads, various types of devices and the like, and the phenomenon of private wiring is also caused, so that the topological structure identification of the distribution room needs to be carried out by a large amount of manual investigation, the labor intensity is high, and the efficiency is low.
The existing distribution station topology identification method is divided into two types. One is a manual survey method. Specifically, firstly, host equipment of the household transformer identification instrument is arranged on the low-voltage side of the distribution transformer, and then, manual general investigation is manually performed section by section according to the line distribution and the trend by the aid of the handheld household transformer identification instrument to obtain topological information of a distribution area. The method has the defects of low efficiency, high cost and incapability of accurately and comprehensively acquiring the topological information of the low-voltage distribution transformer area. In another method, the identification is carried out by installing a terminal acquisition unit and configuring a device identification code. According to the method, part of known physical topological information needs to be correspondingly configured into a device identification code in advance, and the topological structure of the power distribution station area is obtained by collecting and analyzing the physical topological information in the device identification code of each terminal collecting unit. Many information of the method needs to be predicted in advance, and the method also has the defect that the user variable relationship cannot be determined.
The two methods have the defects of inaccurate topology information, incapability of timely feeding back after topology changes and the like, so that a new technology capable of automatically identifying the topological structure of the power distribution area is urgently needed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the automatic identification method of the topology of the low-voltage distribution area, which can realize the automatic identification of the topology structure in the distribution area, and can also automatically identify the change when the topology structure changes so as to correspondingly modify the topology structure.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows: a low-voltage distribution area topology automatic identification method comprises the following steps: s01), dividing the topological structure in the low-voltage distribution station area into three levels, which are respectively: a first level: low-voltage outlet cabinet to branch box, second level: incoming line circuit breaker to outgoing line circuit breaker in the feeder pillar, third level: the circuit breaker of the outlet wire in the branch box is connected to the circuit breaker of the household meter box; s02), when determining a topological structure of a low-voltage distribution station area, acquiring current values and equipment IDs of three topological levels at the same moment, wherein the current values and the equipment IDs are respectively a three-phase current value and an equipment ID of each outgoing line loop in a low-voltage outgoing line cabinet, a three-phase current value and an equipment ID of each breaker in a branch box and a single-phase current value and an equipment ID of each breaker in an household meter box, and a field is arranged in the equipment ID to define the equipment type; s03), respectively corresponding the collected current values to the three levels of step S01 according to the collected device ID; s04), sequentially determining the corresponding relation among the three levels according to the current values of the divided levels, namely the corresponding relation between the low-voltage outlet cabinet and the branch box inlet circuit breaker, the corresponding relation between the inlet circuit breaker and the outlet circuit breaker in the branch box, and the corresponding relation between the branch box outlet circuit breaker and the household meter box circuit breaker; s05), determining the topological structure in the whole low-voltage distribution station area according to the three corresponding relations.
Further, the corresponding relation between the low voltage outlet cabinet and the branch box inlet circuit breaker is determined through a relation S1, and S1 shows that the three-phase current value of the circuit breaker in the low voltage outlet cabinet is equal to the three-phase current value of the circuit breaker in the corresponding branch box.
Further, the corresponding relation between the incoming line circuit breaker and the outgoing line circuit breaker in the branch box is determined through the relation S2 or S3, S2 is that the three-phase voltage value of the incoming line circuit breaker in the branch box is equal to the three-phase voltage value of each corresponding outgoing line circuit breaker, and S3 is that the three-phase current value of the incoming line circuit breaker in the branch box is the sum of the three-phase current values of all corresponding outgoing line circuit breakers.
Further, the corresponding relation between the outgoing line circuit breakers in the branch box and the household meter box circuit breakers is determined through the relation S4 or S5, S4 is that the sum of the currents of all the circuit breakers in the household meter box is equal to the sum of the three-phase currents of the outgoing line circuit breakers of the corresponding branch box, and S5 is the value of A, B, C three-phase currents of the outgoing line circuit breakers of the branch box, which is equal to the sum of the currents of the circuit breakers connected with the corresponding A-phase, B-phase and C-phase power lines in the household meter box.
Further, the specific step of determining the corresponding relationship between the low-voltage outlet cabinet and the branch box inlet circuit breaker by using the relationship S1 is as follows: s411), reading three-phase current values of a low-voltage outlet cabinet outlet loop and a branch box inlet circuit breaker;
s412), finding the corresponding equal relation between the three-phase current values of the outgoing line loop of the low-voltage outgoing line cabinet and the incoming line breaker of the branch box;
s413), judging whether the equality relation is unique, namely whether the condition that the three-phase current values of the multi-component branch box incoming line circuit breaker are all equal to the three-phase current values of an outgoing line loop of an outgoing line cabinet exists, if so, the equality relation is not unique;
s414), if the equality relation is unique, determining the corresponding relation between the low outgoing line cabinet and the branch box incoming line circuit breaker, if the equality relation is not unique, storing the topological relation which can be determined, and acquiring the three-phase current values of the low outgoing line cabinet circuit breaker and the branch box incoming line circuit breaker at the next moment;
s415) and repeating the steps S412 to S414 until only one combination finally meets the three-phase current equality relation, thereby finally determining the topological relation between the circuit breaker in the low-voltage outlet cabinet and the branch box inlet circuit breaker.
Further, after finding the corresponding equivalence relation of the three-phase current values, the power factor is also verified, and when the three-phase currents and the power factor are equal, the corresponding topological relation can be determined.
Further, the specific step of determining the corresponding relationship between the incoming line breaker and the outgoing line breaker in the branch box by using the relationship S3 is as follows: s421), dividing branch box breaker data into an incoming line breaker and an outgoing line breaker according to the equipment ID, listing the combination conditions of all outgoing line breakers, and calculating the three-phase current sum values of all outgoing line breakers in the combination in all the combination conditions;
s422) searching the condition that the three-phase current values of all the incoming line breakers are equal to the sum value of all the combined three-phase currents in the step S421 one by one;
s423), judging whether the equality relation is unique, namely whether the condition that the three-phase current sum value of various branch box outgoing line circuit breaker combinations is equal to the three-phase current value of one branch box incoming line circuit breaker exists, if so, the equality relation is not unique, and performing the step S424, if the equality relation is unique, determining the corresponding relation between the branch box incoming line circuit breaker and the branch box outgoing line circuit breaker;
s424), storing the unique corresponding condition that the combination of the branch box incoming line circuit breaker and the branch box outgoing line circuit breaker is equal, re-collecting the three-phase current values of the branch box outgoing line circuit breaker and the incoming line circuit breaker at the next moment, and repeating the steps S421-S423 until the condition that the sum of the three-phase current values of all the incoming line circuit breakers and the three-phase current values of all the branch box outgoing line circuit breaker combinations is equal is unique, so that the topological relation between all the incoming line molded case circuit breakers and the outgoing line circuit breakers in the second-level branch box is determined.
Further, the specific step of determining the corresponding relationship between the branch box outgoing line circuit breaker and the household meter box circuit breaker by using the relationship S5 is as follows:
s431), listing the combination conditions of all the household meter box circuit breakers, and calculating the sum value of the single-phase currents of all the circuit breakers in the combination in all the combination conditions;
s432), judging the equal relation between the three single-phase currents of the branch box outgoing line circuit breaker and the sum value of all combined currents in the step S431 one by one;
s433), judging whether the equality relation is unique, namely whether the condition that the sum value of the current values of various household meter box circuit breaker combinations is equal to the single-phase current value of the branch box outlet circuit breaker exists, if so, the equality relation is not unique, executing the step S434, and if not, namely, the equality relation is unique, correspondingly determining the branch box outlet circuit breaker and the household meter box circuit breaker;
s434), storing all topology corresponding relations of the branch box outgoing line circuit breakers and the household meter box circuit breakers which can be determined in the step S433, reading current values of the outgoing line molded case circuit breakers and the miniature circuit breakers in the household meter box at the next moment, and repeating the steps S431-S433 until the topology corresponding relations of all the branch box outgoing line circuit breakers and the circuit breakers in the user meter box can be determined.
Further, the corresponding relationship between the branch box outgoing line circuit breaker and the household meter box circuit breaker is verified by using the relationship S4, and the method comprises the following steps: on the basis of solving the single-phase household meter box circuit breaker corresponding to the branch box outlet circuit breaker, adding the three-phase current values of the branch box outlet circuit breaker to obtain a sum value D1, then adding the current values of all the household meter box circuit breakers corresponding to the three phases of the branch box outlet circuit breaker respectively to obtain a sum value D2, if D1 is equal to D2, identifying the third-layer topological relation correctly, if D1 is not equal to D2, identifying the third-layer topological relation incorrectly, and judging again.
The invention has the beneficial effects that: automatic discernment low pressure distribution station district topological structure, when the topology changes in the distribution station district, the result after the accessible intelligence distribution transformer terminal automatic identification topological structure changes has saved the link that the manual work was patrolled and examined, uses manpower sparingly and material resources, patrols and examines still improved the accuracy for the manual work simultaneously.
The device ID is only configured according to the device type in advance, excessive topological structure information is not required to be known in advance, and the method has the advantages of simplicity and easiness in operation.
The intelligent transformation is carried out aiming at a distribution area, and the voltage and current acquisition functions of a molded case circuit breaker and a miniature circuit breaker in a low voltage outlet cabinet and a branch box are acquired.
Drawings
FIG. 1 is a schematic view of a low voltage distribution grid topology;
FIG. 2 is a flow chart of the method described in example 1;
fig. 3 is a flowchart of determining a topological relationship between a low voltage outlet cabinet and a branch box inlet circuit breaker;
FIG. 4 is a flowchart of determining a topological relationship between a branch box incoming line breaker and a branch box outgoing line breaker;
fig. 5 is a flowchart for determining the topological relationship between the branch box outgoing line breaker and the household meter box breaker.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Example 1
The topological structure of the power distribution area is shown in fig. 1, the topological structure is divided into three levels of a low voltage outgoing line cabinet, a branch box and an outdoor meter box, an incoming line breaker and an outgoing line breaker are arranged in the branch box, and the topological structure to be determined is the topological structure from the low voltage outgoing line cabinet to the incoming line breaker of the branch box, the topological structure from the incoming line breaker to the outgoing line breaker in the branch box and the topological structure from the outgoing line breaker of the branch box to the outdoor meter box.
The following describes an embodiment of the present invention with reference to fig. 2, which specifically includes the following steps:
s01), arranging acquisition communication units in the low-voltage outlet cabinet, the branch box and the household meter box, and configuring an intelligent distribution transformer terminal on the low-voltage side of the distribution transformer.
The voltage, the current and the equipment ID of the low-voltage outlet cabinet, the branch box circuit breaker and the household meter box circuit breaker can be acquired in two modes.
The collecting communication unit receives data through data communication interfaces of the low-voltage outlet cabinet, the branch box circuit breaker and the household meter box circuit breaker according to the condition that the low-voltage outlet cabinet, the branch box circuit breaker and the household meter box circuit breaker can collect voltage and current of a power line and can configure equipment ID.
Aiming at the condition that the low-voltage outlet cabinet, the branch box circuit breaker and the household meter box circuit breaker do not have the collection function, the collection communication unit is additionally provided with a voltage and current collection device and a collection communication unit, and the collection communication unit is arranged in a mode of configuring an equipment ID inside the collection communication unit.
The equipment ID contains equipment type information, and the equipment type can be determined according to the equipment ID, so that the collected information is judged to come from low-voltage outlet cabinet equipment, branch box circuit breakers or household meter box circuit breaker equipment.
S02), the intelligent distribution transformer terminal issues a data acquisition instruction. In order to ensure the consistency of the data acquisition time, the data acquisition instruction comprises the data acquisition time. And acquiring equipment ID, voltage and current information of the low-voltage outlet cabinet, the incoming line circuit breaker in the branch box, the outgoing line circuit breaker and the household meter box circuit breaker at the same time.
The collected information is divided into three aspects, which are respectively:
in a first aspect: collecting a three-phase voltage value, a current value, a power factor and an equipment ID of each outgoing line loop in the low-voltage outgoing line cabinet;
in a second aspect: collecting a three-phase voltage value, a current value, a power factor and an equipment ID of each breaker in the branch box;
in a third aspect: the method comprises the steps of collecting single-phase voltage values, current values, power factors and equipment IDs of all circuit breakers in an indoor meter box.
S03), classifying the equipment types according to the equipment ID, and dividing the equipment types into a low-voltage outlet cabinet, a branch box breaker (comprising an inlet wire breaker and an outlet wire breaker) and an individual meter box breaker. And the collected data are divided into the following three topological levels according to the current trend and the equipment type:
a first level: the low-voltage wire outlet cabinet is connected to a branch box;
and a second level: an incoming molded case circuit breaker to an outgoing molded case circuit breaker (three-phase) in the branch box;
a third level: household meter box miniature circuit breakers (single phase);
s04), sequentially determining the corresponding relation among the three levels according to the collected data which are classified into the levels, namely:
the corresponding relation between the low voltage outlet cabinet and the corresponding branch box inlet circuit breaker;
the corresponding relation between the incoming line circuit breaker and the outgoing line circuit breaker inside each branch box;
and the corresponding relation between each branch box outgoing line circuit breaker and the corresponding household meter box circuit breaker.
S05), determining the topological structure diagram in the whole power distribution station area by combining the determined three corresponding relations.
In the physical topological structure, outgoing line loops of the low outgoing line cabinet correspond to incoming line circuit breakers in the branch box one by one, and the relationship that the three-phase voltage, current and power values of the outgoing line loops in the low outgoing line cabinet are equal to the three-phase voltage, current and power values of the incoming line circuit breakers in the corresponding branch box exists. Therefore, the topological structure from the low-voltage outlet cabinet breaker to the branch box can be determined through the relationship.
In this embodiment, the topological structure from the low-voltage outgoing line cabinet circuit breaker to the branch box, that is, the corresponding relationship between the low-voltage outgoing line cabinet and the branch box incoming line circuit breaker, is determined by the relationship that the three-phase current values of the low-voltage incoming line cabinet circuit breaker and the incoming line circuit breaker in the corresponding branch box are equal. As shown in fig. 3, the molded case circuit breaker in fig. 3 is a branch box incoming line circuit breaker, and specifically includes the following steps:
s411), reading three-phase current values of a low-voltage outlet cabinet outlet loop and a branch box inlet circuit breaker;
s412), searching the corresponding equal relation of the three-phase current values of the low voltage outlet cabinet and the branch box incoming line circuit breaker;
s413), judging whether the equality relation is unique, namely whether the condition that the three-phase current values of the multi-component branch box incoming line circuit breaker are all equal to the three-phase current value of an outgoing line cabinet circuit breaker exists, if so, the equality relation is not unique;
s414), if the equality relation is unique, determining the corresponding relation between the low outgoing line cabinet and the branch box incoming line circuit breaker, if the equality relation is not unique, storing the topological relation which can be determined, and acquiring the three-phase current values of the low outgoing line cabinet circuit breaker and the branch box incoming line circuit breaker at the next moment;
s415) and repeating the steps S412 to S414 until only one combination finally meets the three-phase current equality relation, thereby finally determining the topological relation between the circuit breaker in the low-voltage outlet cabinet and the branch box inlet circuit breaker.
For example, four breakers a1, a2, A3 and a4 (namely four outgoing line loops) are arranged in a low-voltage outgoing line cabinet, a branch box is provided with four incoming line breakers B1, B2, B3 and B4, when a three-phase current value is read for the first time, a1= B1 and a2= B2 are in unique equal relation, and the topology between the breakers can be determined, but B3 and B4 are equal to A3 and a4 at the same time, the topology between the breakers cannot be determined, the determined topologies of a1-B1 and a2-B2 are saved at the moment, the three-phase current value at the next moment is collected, and judgment is carried out again.
In order to increase the accuracy of the topology identification, after finding the corresponding equality relation of the three-phase current values, the power factor verification is also carried out. When the three-phase current and the power factor are equal, the corresponding topological relation can be determined.
After the first corresponding relation is confirmed, the incoming line circuit breakers in each branch box are already determined, and the rest undetermined circuit breakers are outgoing line circuit breakers. On the basis, parameters such as voltage, current, equipment ID and the like of the incoming line circuit breaker and the outgoing line circuit breaker collected in the second level are used for determining the corresponding relation between the incoming line circuit breaker and the outgoing line circuit breaker of the second level.
The determination may be made based on the relationship S2 or S3 existing inside the branch box.
Relationship S2: the three-phase voltage value of the incoming line circuit breaker in the branch box is equal to the three-phase voltage value of each outgoing line circuit breaker;
relationship S3: the three-phase current value of the incoming line circuit breaker in the branch box is the sum of the three-phase current values of the outgoing line circuit breakers.
Inside the branch box, an incoming line circuit breaker is connected with a plurality of outgoing line circuit breakers. Therefore, the three-phase current value of the incoming line breaker is the sum of the three-phase current values of all outgoing line breakers in the branch box, and the sum relationship exists until the physical topological relationship of the actual line changes. In this embodiment, a corresponding relationship between an incoming line breaker and an outgoing line breaker in a branch box is determined by using a current sum value, i.e., a relationship S3, as shown in fig. 4, the incoming line molded case circuit breaker is a branch box incoming line breaker, and the outgoing line molded case circuit breaker is a branch box outgoing line breaker, including the following steps:
s421), dividing branch box breaker data into an incoming line breaker and an outgoing line breaker according to the equipment ID, listing the combination conditions of all outgoing line breakers, and calculating the three-phase current sum values of all outgoing line breakers in the combination in all the combination conditions;
s422) searching the condition that the three-phase current values of all the incoming line breakers are equal to the sum value of all the combined three-phase currents in the step S421 one by one;
s423), judging whether the equality relation is unique, namely whether the condition that the three-phase current sum value of the combination condition of the outgoing line circuit breakers of various branch boxes is equal to the three-phase current value of the incoming line circuit breaker of one branch box exists, if so, the equality relation is not unique, and performing the step S424, if the equality relation is unique, determining that the incoming line circuit breaker and the outgoing line circuit breaker contained in the combination are in the same branch box, and determining the topological relation;
and S424), storing the unique corresponding condition that the combination of the incoming line circuit breaker and the outgoing line circuit breaker is equal, re-collecting the three-phase current values of the outgoing line circuit breaker and the incoming line circuit breaker of the branch box at the next moment, and repeating the steps S421-S423 until the condition that the sum of the three-phase current values of all the incoming line circuit breakers and the sum of the three-phase current values of all the combinations is equal is unique, so that the topological relation between all the incoming line molded case circuit breakers and the outgoing line circuit breakers in the second-level branch box.
The third corresponding relationship can be described as the corresponding relationship between the outgoing line breaker in the branch box and the household meter box. The specific three-phase electricity enters the household meter box through the outgoing line breaker, and is divided into three single-phase loops to supply power to users through the household meter box breaker. Determining from the relationships S4 and S5:
relationship S4: the sum of the currents of all the circuit breakers in the household meter box is equal to the sum of the three-phase currents of the circuit breakers outgoing from the corresponding branch box;
relationship S5: the A, B, C three-phase current value of the branch box outlet circuit breaker is equal to the sum of the current values of the circuit breakers connected with the A-phase, B-phase and C-phase power lines in the household meter box.
In this embodiment, the corresponding relationship between the outgoing line circuit breaker in the branch box and the household meter box is determined through the relationship S5, as shown in fig. 5, the specific steps are that, in fig. 5, the miniature circuit breaker is the household meter box circuit breaker, and the outgoing molded case circuit breaker is the outgoing line circuit breaker of the branch box:
s431), listing the combination conditions of all the household meter box circuit breakers, and calculating the sum value of the single-phase currents of all the circuit breakers in the combination in all the combination conditions;
s432), judging the equal relation between the three single-phase currents of the branch box outgoing line circuit breaker and the sum value of all combined currents in the step S431 one by one
S433), judging whether the equality relation is unique, namely whether the condition that the sum value of the current values of various household meter box circuit breaker combinations is equal to the single-phase current value of the branch box outlet circuit breaker exists, if so, the equality relation is not unique, executing the step S434, and if not, namely, the equality relation is unique, correspondingly determining the branch box outlet circuit breaker and the household meter box circuit breaker;
s434), storing all topology corresponding relations of the branch box outgoing line circuit breakers and the household meter box circuit breakers which can be determined in the step S433, reading current values of the outgoing line molded case circuit breakers and the miniature circuit breakers in the household meter box at the next moment, and repeating the steps S431-S433 until the topology corresponding relations of all the branch box outgoing line circuit breakers and the circuit breakers in the user meter box can be determined.
In order to increase the accuracy of the topological structure identification, verification can be performed by using a relation S4, on the basis of solving the individual-phase household meter box circuit breaker corresponding to the branch box outgoing circuit breaker, the three-phase current values of the branch box outgoing circuit breaker are added to obtain a sum value D1, then the current values of all the household meter box circuit breakers corresponding to the three phases of the branch box outgoing circuit breaker are added to obtain a sum value D2, if D1 is equal to D2, the third-layer topological relation identification is correct, and if D1 is not equal to D2, the third-layer topological relation identification is wrong, and the judgment is performed again.
The invention can automatically identify the topological structure of the low-voltage distribution area, and can automatically identify the result after the topological structure is changed when the topology in the distribution area is changed, thereby saving the link of manual inspection, saving manpower and material resources, and simultaneously improving the accuracy compared with the manual inspection.
The method only needs to configure the equipment ID in advance according to the equipment type, does not need to know excessive topological structure information in advance, and has the advantages of simplicity and easiness in operation.
The foregoing description is only for the basic principle and the preferred embodiments of the present invention, and modifications and substitutions by those skilled in the art are included in the scope of the present invention.
Claims (9)
1. A low-voltage distribution area topology automatic identification method is characterized in that: the method comprises the following steps: s01), dividing the topological structure in the low-voltage distribution station area into three levels, which are respectively: a first level: low-voltage outlet cabinet to branch box, second level: incoming line circuit breaker to outgoing line circuit breaker in the feeder pillar, third level: the circuit breaker of the outlet wire in the branch box is connected to the circuit breaker of the household meter box; s02), when determining a topological structure of a low-voltage distribution station area, acquiring current values and equipment IDs of three topological levels at the same moment, wherein the current values and the equipment IDs are respectively a three-phase current value and an equipment ID of each outgoing line loop in a low-voltage outgoing line cabinet, a three-phase current value and an equipment ID of each breaker in a branch box and a single-phase current value and an equipment ID of each breaker in an household meter box, and a field is arranged in the equipment ID to define the equipment type; s03), respectively corresponding the collected current values to the three levels of step S01 according to the collected device ID; s04), sequentially determining the corresponding relation among the three levels according to the current values of the divided levels, namely the corresponding relation between the low-voltage outlet cabinet and the branch box inlet circuit breaker, the corresponding relation between the inlet circuit breaker and the outlet circuit breaker in the branch box, and the corresponding relation between the branch box outlet circuit breaker and the household meter box circuit breaker; s05), determining the topological structure in the whole low-voltage distribution station area according to the three corresponding relations.
2. The automatic low voltage distribution substation topology identification method according to claim 1, characterized in that: and determining the corresponding relation between the low-voltage outgoing line cabinet and the branch box incoming line circuit breaker through the relation S1, wherein S1 indicates that the three-phase current value of the circuit breaker in the low-voltage outgoing line cabinet is equal to the three-phase current value of the incoming line circuit breaker in the corresponding branch box.
3. The automatic low voltage distribution substation topology identification method according to claim 1, characterized in that: and determining the corresponding relation between the incoming line circuit breaker and the outgoing line circuit breaker in the branch box according to the relation S2 or S3, wherein S2 is that the three-phase voltage value of the incoming line circuit breaker in the branch box is equal to the three-phase voltage value of each corresponding outgoing line circuit breaker, and S3 is that the three-phase current value of the incoming line circuit breaker in the branch box is the sum of the three-phase current values of all corresponding outgoing line circuit breakers.
4. The automatic low voltage distribution substation topology identification method according to claim 1, characterized in that: determining the corresponding relation between the outgoing line circuit breakers in the branch box and the household meter box circuit breakers through the relation S4 or S5, wherein S4 is the sum of the currents of all the circuit breakers in the household meter box and is equal to the sum of the three-phase currents of the outgoing line circuit breakers of the corresponding branch box, and S5 is the value of A, B, C three-phase currents of the outgoing line circuit breakers of the branch box and is respectively equal to the sum of the currents of the circuit breakers connected with the corresponding A-phase, B-phase and C-phase power lines in the household meter box.
5. The automatic low voltage distribution substation topology identification method according to claim 2, characterized in that: the specific steps for determining the corresponding relationship between the low-voltage outlet cabinet and the branch box inlet circuit breaker by using the relationship S1 are as follows: s411), reading three-phase current values of a low-voltage outlet cabinet outlet loop and a branch box inlet circuit breaker;
s412), finding the corresponding equal relation between the three-phase current values of the outgoing line loop of the low-voltage outgoing line cabinet and the incoming line breaker of the branch box;
s413), judging whether the equality relation is unique, namely whether the condition that the three-phase current values of the multi-component branch box incoming line circuit breaker are all equal to the three-phase current values of an outgoing line loop of an outgoing line cabinet exists, if so, the equality relation is not unique;
s414), if the equality relation is unique, determining the corresponding relation between the low outgoing line cabinet and the branch box incoming line circuit breaker, if the equality relation is not unique, storing the topological relation which can be determined, and acquiring the three-phase current values of the low outgoing line cabinet circuit breaker and the branch box incoming line circuit breaker at the next moment;
s415) and repeating the steps S412 to S414 until only one combination finally meets the three-phase current equality relation, thereby finally determining the topological relation between the circuit breaker in the low-voltage outlet cabinet and the branch box inlet circuit breaker.
6. The automatic low voltage distribution substation topology identification method according to claim 5, characterized in that: after finding the corresponding equal relation of the three-phase current values, the power factor is also verified, and when the three-phase current and the power factor are equal, the corresponding topological relation can be determined.
7. The automatic low voltage distribution substation topology identification method according to claim 3, characterized in that: the specific steps for determining the corresponding relationship between the incoming line circuit breaker and the outgoing line circuit breaker in the branch box by using the relationship S3 are as follows: s421), dividing branch box breaker data into an incoming line breaker and an outgoing line breaker according to the equipment ID, listing the combination conditions of all outgoing line breakers, and calculating the three-phase current sum values of all outgoing line breakers in the combination in all the combination conditions;
s422) searching the condition that the three-phase current values of all the incoming line breakers are equal to the sum value of all the combined three-phase currents in the step S421 one by one;
s423), judging whether the equality relation is unique, namely whether the condition that the three-phase current sum value of various branch box outgoing line circuit breaker combinations is equal to the three-phase current value of one branch box incoming line circuit breaker exists, if so, the equality relation is not unique, and performing the step S424, if the equality relation is unique, determining the corresponding relation between the branch box incoming line circuit breaker and the branch box outgoing line circuit breaker;
s424), storing the unique corresponding condition that the combination of the branch box incoming line circuit breaker and the branch box outgoing line circuit breaker is equal, re-collecting the three-phase current values of the branch box outgoing line circuit breaker and the incoming line circuit breaker at the next moment, and repeating the steps S421-S423 until the condition that the sum of the three-phase current values of all the incoming line circuit breakers and the three-phase current values of all the branch box outgoing line circuit breaker combinations is equal is unique, so that the topological relation between all the incoming line molded case circuit breakers and the outgoing line circuit breakers in the second-level branch box is determined.
8. The automatic low voltage distribution substation topology identification method according to claim 4, characterized in that: the specific steps for determining the corresponding relation between the branch box outgoing line circuit breaker and the household meter box circuit breaker by using the relation S5 are as follows:
s431), listing the combination conditions of all the household meter box circuit breakers, and calculating the sum value of the single-phase currents of all the circuit breakers in the combination in all the combination conditions;
s432), judging the equal relation between the three single-phase currents of the branch box outgoing line circuit breaker and the sum value of all combined currents in the step S431 one by one;
s433), judging whether the equality relation is unique, namely whether the condition that the sum value of the current values of various household meter box circuit breaker combinations is equal to the single-phase current value of the branch box outlet circuit breaker exists, if so, the equality relation is not unique, executing the step S434, and if not, namely, the equality relation is unique, correspondingly determining the branch box outlet circuit breaker and the household meter box circuit breaker;
s434), storing all topology corresponding relations of the branch box outgoing line circuit breakers and the household meter box circuit breakers which can be determined in the step S433, reading current values of the outgoing line molded case circuit breakers and the miniature circuit breakers in the household meter box at the next moment, and repeating the steps S431-S433 until the topology corresponding relations of all the branch box outgoing line circuit breakers and the circuit breakers in the user meter box can be determined.
9. The automatic low voltage distribution substation topology identification method according to claim 8, characterized in that: the corresponding relation between the branch box outgoing line circuit breaker and the household meter box circuit breaker is verified by using the relation S4, and the method comprises the following steps: on the basis of solving the single-phase household meter box circuit breaker corresponding to the branch box outlet circuit breaker, adding the three-phase current values of the branch box outlet circuit breaker to obtain a sum value D1, then adding the current values of all the household meter box circuit breakers corresponding to the three phases of the branch box outlet circuit breaker respectively to obtain a sum value D2, if D1 is equal to D2, identifying the third-layer topological relation correctly, if D1 is not equal to D2, identifying the third-layer topological relation incorrectly, and judging again.
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