CN113964831B

CN113964831B - Load adjusting method, load adjusting device, electronic equipment and computer readable storage medium

Info

Publication number: CN113964831B
Application number: CN202111277673.8A
Authority: CN
Inventors: 李洪涛; 郝良; 王博; 唐先武; 齐吉; 赵贺
Original assignee: Beijing Zetuo Technology Co ltd; State Grid Corp of China SGCC; State Grid Beijing Electric Power Co Ltd
Current assignee: Beijing Zetuo Technology Co ltd; State Grid Corp of China SGCC; State Grid Beijing Electric Power Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2023-11-24
Anticipated expiration: 2041-10-29
Also published as: CN113964831A

Abstract

The invention discloses a load adjusting method, a load adjusting device, electronic equipment and a computer readable storage medium. Wherein the method comprises the following steps: determining three current values and three voltage values corresponding to three phases on three-phase lines at a plurality of nodes; obtaining current difference values of maximum current values and minimum current values in three current values corresponding to three phases on three-phase lines at a plurality of nodes, and voltage difference values of maximum voltage values and minimum voltage values in three voltage values; acquiring an adjusting node set, wherein the adjusting node set comprises a preset number of nodes, the current difference value of which is larger than a first threshold value and the voltage difference value of which is larger than a second threshold value, in a plurality of nodes; and reallocating the load on each phase of the three-phase line at each node in the regulation node set according to a preset rule. The invention solves the technical problem that the number and the positions of the phase change switches are difficult to reasonably balance when the three-phase unbalance adjustment is carried out by adopting the phase change switch method in the related art.

Description

Load adjusting method, load adjusting device, electronic equipment and computer readable storage medium

Technical Field

The present invention relates to the field of computers, and in particular, to a load adjustment method, a load adjustment device, an electronic device, and a computer readable storage medium.

Background

In general, a low-voltage distribution network adopts a three-phase four-wire system, and the problem of three-phase imbalance caused by maldistribution of single-phase loads on three phases is difficult to avoid. The method can effectively reduce the transformer loss and the line loss, and gradually becomes one of the main technical means for three-phase unbalance treatment. When the three-phase load automatic adjustment method is adopted to solve the problems, in principle, the more the phase change switches are configured, the better the treatment effect is, but in view of economy, the more the number of the phase change switches are installed, the more the input cost is, the longer the time for recovering the cost is, the worse the economy is, and the problem of how to obtain a satisfactory compromise between the treatment effect and the economy is needed to be solved. The method for determining the installation positions and the number of the phase change switches by the optimization method in the related art generally needs to acquire complete information of the low-voltage line, including transformer parameters, line parameters and long-time load curves of all single-phase users, the information can not be completely acquired, the cost for acquiring the information is relatively high, and the method is difficult to be applied to actual three-phase imbalance treatment work.

In view of the above problems, no effective solution has been proposed at present.

Disclosure of Invention

The embodiment of the invention provides a load adjusting method, a load adjusting device, electronic equipment and a computer readable storage medium, which at least solve the technical problem that the number and the positions of phase change switches are difficult to reasonably balance when three-phase unbalance adjustment is carried out by adopting the phase change switch method in the related technology.

According to an aspect of an embodiment of the present invention, there is provided a load adjustment method including: determining three current values and three voltage values corresponding to three phases on three-phase lines at a plurality of nodes; obtaining current difference values of maximum current values and minimum current values in three current values corresponding to three phases on three-phase lines at a plurality of nodes, and voltage difference values of maximum voltage values and minimum voltage values in three voltage values; acquiring an adjusting node set, wherein the adjusting node set comprises a preset number of nodes, the current difference value of which is larger than a first threshold value and the voltage difference value of which is larger than a second threshold value, in a plurality of nodes; and reallocating the load on each phase of the three-phase line at each node in the regulation node set according to a preset rule.

Optionally, determining three current values and three voltage values corresponding to three phases on the three-phase line at the plurality of nodes includes: three current values corresponding to three phases on a three-phase line at a preset node are obtained, wherein the preset node is the node closest to the transformer in the plurality of nodes; obtaining a first current difference value between a maximum current value and a minimum current value in three current values corresponding to three phases on a three-phase line at the preset node; acquiring a ratio between the first current difference value and a maximum current value corresponding to the preset node; and under the condition that the ratio is larger than a third threshold value, determining three current values and three voltage values corresponding to three phases on the three-phase line at the plurality of nodes.

Optionally, obtaining the set of adjustment nodes includes: obtaining a first node set when the current difference value is greater than a first threshold value and the number of nodes with the voltage difference value greater than a second threshold value is greater than or equal to the preset number in the plurality of nodes, wherein the first node set comprises nodes with the current difference value greater than the first threshold value and the voltage difference value greater than the second threshold value in the plurality of nodes; determining unbalanced power corresponding to each node in the first node set, and arranging the nodes in the first node set in sequence according to the unbalanced power; and acquiring the regulating node set under the condition that the number of nodes with unbalanced power larger than a fourth threshold value is larger than or equal to the preset number, wherein the regulating node set comprises the first preset number of nodes in the first node set.

Optionally, if the number of nodes with unbalanced power greater than the fourth threshold is less than the predetermined number, a second node set is acquired, where the second node set includes nodes with unbalanced power less than or equal to the fourth threshold in the first node set, and the nodes in the second node set are arranged in sequence according to the unbalanced power; determining an unbalanced power gap between adjacent nodes in the second set of nodes; and acquiring the regulating node set under the condition that the unbalanced power difference between the adjacent nodes in the second node set is larger than or equal to a fifth threshold value, wherein the regulating node set comprises the first preset number of nodes in the first node set.

Optionally, selecting a third combined node set under the condition that the unbalanced power difference between the adjacent nodes in the second node set is smaller than a fifth threshold, wherein the third combined node set comprises at least one group of first adjacent combined nodes, and the unbalanced power difference between the adjacent nodes in the second node set is smaller than the fifth threshold; determining the distance between each node in the first adjacent combined nodes and the transformer, and arranging the nodes in the first adjacent combined nodes in sequence according to the distance; determining a distance difference between adjacent nodes in the first adjacent combined node; acquiring a node set to be selected according to the distance difference, wherein the nodes in the node set to be selected are arranged in sequence according to the unbalanced power; and acquiring the adjusting node set, wherein the adjusting node set comprises the previous preset number of nodes in the node set to be selected.

Optionally, acquiring the node set to be selected according to the distance difference includes: obtaining a fourth node set under the condition that the distance difference between adjacent nodes in the first adjacent combined node is larger than or equal to a sixth threshold value, wherein the fourth node set comprises partial nodes selected according to the distance between each node and the transformer in the first adjacent combined node, and the nodes in the fourth node set are arranged in sequence according to the unbalanced power so that the unbalanced power difference between the adjacent nodes in the fourth node set is larger than or equal to the fifth threshold value; obtaining a node set to be selected, wherein the node set to be selected comprises nodes in the first node set, nodes with unbalanced power differences between adjacent nodes in the second node set being greater than or equal to a fifth threshold value, and nodes in the fourth node set, and the nodes in the node set to be selected are sequentially arranged according to the unbalanced power.

Optionally, acquiring the node set to be selected according to the distance difference includes: selecting a fifth combination node set under the condition that the distance difference between adjacent nodes in the first adjacent combination nodes is smaller than a sixth threshold value, wherein the fifth combination node set comprises at least one group of second adjacent combination nodes of which the distance differences between adjacent nodes in the first adjacent combination nodes are smaller than the sixth threshold value; determining zero line current increment values at all nodes in the second adjacent combined nodes, and arranging the nodes in the second adjacent combined nodes in sequence according to the zero line current increment values; obtaining a sixth node set, wherein the sixth node set comprises partial nodes selected according to the zero line current increment value of each node in the second adjacent combined node and the distance between each node in the first adjacent combined node and the transformer, and the nodes in the sixth node set are arranged in sequence according to the unbalanced power so that the unbalanced power difference between the adjacent nodes in the sixth node set is greater than or equal to a fifth threshold; obtaining a node set to be selected, wherein the node set to be selected comprises nodes in the first node set, nodes with unbalanced power differences between adjacent nodes in the second node set being greater than or equal to a fifth threshold value, and nodes in the sixth node set, and the nodes in the node set to be selected are sequentially arranged according to the unbalanced power.

According to another aspect of an embodiment of the present invention, there is provided a load adjustment method including: a load adjustment device comprising: the determining module is used for determining three current values and three voltage values corresponding to three phases on the three-phase line at the plurality of nodes; the first acquisition module is used for acquiring current difference values of maximum current values and minimum current values in three current values corresponding to three phases of three-phase lines at the plurality of nodes and voltage difference values of maximum voltage values and minimum voltage values in the three voltage values; a second acquisition module configured to acquire a set of adjustment nodes, wherein the set of adjustment nodes includes a predetermined number of nodes of the plurality of nodes for which the current difference is greater than a first threshold and the voltage difference is greater than a second threshold; and the distribution module is used for redistributing the loads on each phase of the three-phase line at each node in the regulation node set according to a preset rule.

According to another aspect of an embodiment of the present invention, there is provided an electronic apparatus including: a processor; a memory for storing the processor-executable instructions; wherein the processor is configured to execute the instructions to implement any of the load regulation methods.

According to another aspect of an embodiment of the present invention, there is provided a computer-readable storage medium, which when executed by a processor of an electronic device, causes the electronic device to perform any of the load adjustment methods.

According to another aspect of an embodiment of the present invention, there is provided a computer program product comprising a computer program which, when executed by a processor, implements the load adjustment method of any one of the claims.

In the embodiment of the invention, three current values and three voltage values corresponding to three phases on three-phase lines at a plurality of nodes are determined, voltage difference values and current difference values corresponding to the three phases on the three-phase lines at the plurality of nodes are obtained, a preset number of adjusting node sets are selected from the nodes with the voltage difference value larger than a first threshold value and the current difference value larger than a second threshold value, and because the adjusting node sets are the preset number of nodes which are selected from the plurality of nodes and meet the condition, the obtained adjusting nodes meet the requirement, the number and positions of the adjusting nodes can be reasonably weighted, namely the positions and the numbers of phase change switches can be reasonably weighted, and then the loads on each phase of the three-phase lines at the adjusting nodes are redistributed according to the preset rule, so that the purpose of three-phase load balance is achieved, and the technical problem that the number and the positions of the phase change switches are difficult to reasonably weigh when the three-phase unbalance adjustment is carried out by adopting the phase change switch method in the related technology is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

FIG. 1 is a flow chart of a load regulation method according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a three-phase four-wire low voltage line connection provided by an alternative embodiment of the present application;

fig. 3 is a block diagram of a load adjusting device according to an embodiment of the present application;

fig. 4 is a block diagram illustrating a structure of a terminal according to an exemplary embodiment.

Detailed Description

According to an embodiment of the present application, there is provided an embodiment of a load adjustment method, it being noted that the steps shown in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that herein.

Fig. 1 is a flowchart of a load adjustment method according to an embodiment of the present application, as shown in fig. 1, including the steps of:

Step S102, three current values and three voltage values corresponding to three phases on three-phase lines at a plurality of nodes are determined;

step S104, obtaining current difference values of maximum current values and minimum current values in three current values corresponding to three phases on three-phase lines at a plurality of nodes, and voltage difference values of maximum voltage values and minimum voltage values in three voltage values;

step S106, an adjusting node set is obtained, wherein the adjusting node set comprises a preset number of nodes, the current difference value of which is larger than a first threshold value and the voltage difference value of which is larger than a second threshold value, in a plurality of nodes;

step S108, the loads on the three phases of the three-phase line at each node in the adjusting node set are redistributed according to a preset rule.

The three current values and the three voltage values corresponding to the three phases on the three-phase lines at the plurality of nodes are determined, the voltage difference value and the current difference value corresponding to the three phases on the three-phase lines at the plurality of nodes are obtained, a preset number of adjusting node sets are selected from the nodes with the voltage difference value larger than a first threshold value and the current difference value larger than a second threshold value, and the adjusting node sets are the preset number of nodes which are selected from the nodes and meet the condition, so that the obtained adjusting nodes meet the requirements, the number and the positions of the adjusting nodes can be reasonably weighted, namely the positions and the number of phase change switches can be reasonably weighted, then the loads on the three phases on the three-phase lines at the adjusting nodes are redistributed according to the preset rule, the purpose of three-phase load balance is achieved, and the technical problem that the number and the positions of the phase change switches are difficult to reasonably balance when the three-phase unbalance adjustment is carried out by adopting the phase change switch method in the related technology is solved.

As an alternative embodiment, three current values and three voltage values corresponding to three phases on a three-phase line at a plurality of nodes are determined, in a low-voltage line based on three-phase four-wire system, a node in the low-voltage line is determined, continuous three-phase voltage data of each node of the low-voltage line in a period of time and continuous current data of each single-phase load connected to the node are obtained, wherein the time for obtaining the voltage data and the current data can be customized, for example, the time can be in a unit of day, or other customized settings can be made. In a low-voltage circuit of a three-phase four-wire system, three phases are A, B, C three phases, and four wires are A, B, C three phase lines and a zero line N respectively. The obtained three-phase voltage data, namely the voltage value of each single phase in the three phases, is the voltage difference between the A, B, C three phase lines and the zero line N. The obtained current data, namely the current value on each single phase in the three phases, is the sum of the current values on the loads connected with each phase in the A, B, C three phases. All the information required by the three-phase unbalance adjustment is obtained by acquiring three current values and three voltage values corresponding to the three phases on the three-phase lines at the plurality of nodes, and only the information at each node is required to be acquired, so that the information of each single-phase user load is not required to be acquired, all the information required by the three-phase unbalance adjustment is acquired at lower cost, and the subsequent three-phase unbalance adjustment is convenient.

As an alternative embodiment, a voltage difference value between a maximum voltage value and a minimum voltage value in three voltage values corresponding to three phases on a three-phase line at a plurality of nodes and a current difference value between a maximum current value and a minimum current value in three current values are obtained, and an adjusting node set including a predetermined number of nodes, that is, an adjusting node set including a predetermined number of adjusting nodes, is selected from the nodes where the current difference value is greater than a first threshold and the voltage difference value is greater than a second threshold. And redistributing the loads on each phase of the three-phase line at the regulating node according to a preset rule, wherein the loads can comprise user loads, namely loads used by users connected on the phase lines, and after the regulating node is selected, installing a phase change switch at the regulating node to realize the regulation of three-phase unbalance. The first threshold and the second threshold can be set according to practical application requirements and experience. The predetermined number may be determined by the power of the transformer, i.e. the number of nodes that can be adjusted at most may be determined based on the power of the transformer, so as to select the adjusting node within a predetermined number range. The adjusting node is determined through the voltage difference value and the current difference value, so that the load at the adjusting node can be distributed, the overall three-phase balance of the low-voltage line is realized, and the three-phase balance on each section of the low-voltage line is also realized. When the loads at the adjusting node are distributed, the loads causing three-phase unbalance can be effectively found out, and the loads are redistributed according to a preset rule, wherein the preset rule can be various, for example, the preset rule can be a three-phase current balance rule, a three-phase voltage balance rule and the like. On the basis of meeting three-phase current balance and three-phase voltage balance rules, a principle of least quantity of regulating loads can be set, a principle of least workload required by regulating loads can be set, and the like, and self-adaptive design can be carried out according to actual scenes and requirements.

As an alternative embodiment, before determining three current values and three voltage values corresponding to three phases on the three-phase line at the plurality of nodes, it may be determined whether the three-phase imbalance adjustment needs to be started, where the manner of determining whether the three-phase imbalance adjustment needs to be started is many, for example, may be as follows: three current values corresponding to three phases on a three-phase line at a preset node are obtained, wherein the preset node is the node closest to the transformer in a plurality of nodes, and the node closest to the transformer can better reflect the unbalanced degree of the three phases, so that the voltage value corresponding to the preset node is obtained. And then, obtaining a first current difference value of the maximum current value and the minimum current value in three current values corresponding to the three phases of the three-phase line at the preset node, and further obtaining a ratio between the first current difference value and the maximum current value corresponding to the preset node, namely, according to the ratio of the maximum current value and the minimum current value in the three current values corresponding to the three phases of the three-phase line at the node closest to the transformer, carrying out three-phase unbalance adjustment under the condition that the ratio is larger than a third threshold value, and determining three current values and three voltage values corresponding to the three phases of the three-phase line at the plurality of nodes. The third threshold may be set according to practical application requirements and experience. By the mode, whether the three-phase unbalanced regulation is required to be started or not can be determined only by acquiring the current difference value corresponding to the nearest node of the transformer, and the load is redistributed under the condition of three-phase unbalance, so that resources such as manpower and calculation are saved, and orderly three-phase load regulation is ensured.

As an alternative embodiment, when the set of adjustment nodes is acquired from among the plurality of nodes, the number of nodes whose current difference is greater than the first threshold and whose voltage difference is greater than the second threshold is greater than a predetermined number, in which case the first set of nodes whose current difference is greater than the first threshold and whose voltage difference is greater than the second threshold is acquired, the nodes in the first set of nodes are processed, and the adjustment nodes are selected from among them. When the adjusting node is selected from the first node set, for example, unbalanced power corresponding to each node in the first node set is determined, the magnitude of the unbalanced power is determined, and the adjusting node set is selected according to the magnitude of the unbalanced power. I.e. from the nodes with unbalanced power above the fourth threshold, a predetermined number of nodes are selected as regulating nodes. The fourth threshold may be set according to practical application requirements and experience. It should be noted that, the unbalanced power is calculated according to the product of the deviation between the maximum voltage value and the minimum voltage value in three voltage values corresponding to three phases on three-phase lines which last for a period of time in each node of the low-voltage line and the deviation between the maximum current value and the minimum current value in three current values corresponding to three phases on three-phase lines in each node, and is used for determining the position of the adjusting node so as to realize the adjustment of three-phase unbalance.

As an alternative embodiment, when the adjustment node set is selected according to the magnitude of the unbalanced power, two situations may occur, where the first situation is that the number of unbalanced power is greater than or equal to the predetermined number, that is, when the predetermined number of nodes selected from the nodes with unbalanced power greater than the fourth threshold are the adjustment nodes, the number of unbalanced power greater than the fourth threshold is greater than or equal to the predetermined number, where the adjustment node set may be directly selected from the first node set, that is, the nodes in the first node set are sequentially arranged according to the magnitude of the unbalanced power, and the first predetermined number of nodes selected from the first node set are the adjustment node set, which does not need to consider more situations, saves the calculation amount, and speeds up the calculation process.

As an alternative embodiment, when the adjustment node set is selected according to the magnitude of the unbalanced power, two situations may occur, where the second situation is that the number of unbalanced power is very large and is smaller than the predetermined number, that is, when the predetermined number of nodes is selected as the adjustment nodes from the nodes with unbalanced power being greater than the fourth threshold, the situation occurs that the number of nodes with unbalanced power being greater than the fourth threshold is smaller than the predetermined number, in which case, the node with unbalanced power being greater than the fourth threshold is selected as the adjustment node first, and then, from the nodes with unbalanced power being less than or equal to the fourth threshold, the remaining number of nodes are selected as the adjustment nodes. And under the condition that the number of the nodes with unbalanced power larger than the fourth threshold value is smaller than the preset number, acquiring a second node set, wherein the second node set comprises the nodes with unbalanced power smaller than or equal to the fourth threshold value in the first node set, and selecting the rest number of nodes from the second node set as regulating nodes.

As an optional embodiment, when the remaining number of nodes are selected as the adjustment nodes from the nodes with unbalanced power less than or equal to the fourth threshold, the selection may be performed according to various conditions, that is, after the second node set is acquired, the nodes in the second node set are arranged in sequence according to the unbalanced power. I.e. the second set of nodes comprises a plurality of nodes arranged in an unbalanced power order. In the related art, the first few larger nodes are directly selected as the adjusting nodes. However, in the second node set, there may be a case where the gap between adjacent nodes is small, in which case only one node or part of the nodes needs to be selected, and when one node or part of the nodes is selected, the node or part of the nodes can be selected according to the distance between the node and the transformer, so that the three-phase imbalance adjustment can be more effectively performed. The selection of the adjustment node can be performed according to the unbalanced power difference between the adjacent nodes, and it should be noted that the unbalanced power difference refers to the difference between the unbalanced power corresponding to the current node and the unbalanced power corresponding to the next node in the set, and the selection of the adjustment node is performed through the unbalanced power difference between the adjacent nodes. The node with smaller unbalanced power difference can be screened, and when the unbalanced power difference between the adjacent nodes is too small, the selection of the adjusting node is performed according to the distance difference between the adjacent nodes. When the nodes are selected according to the distance between the nodes and the transformer, the condition that the distance difference between the nodes is relatively close also occurs, when the distance difference between the nodes is relatively small, only one or a part of nodes among the adjacent nodes are selected, and when one or a part of nodes are selected, the selected nodes can be selected according to the zero line current increment value of the nodes, so that the finally selected regulating nodes are more accurate, and three-phase unbalanced regulation can be more effectively carried out. And a node set can be obtained, wherein the nodes are arranged in sequence according to the distance, the distance difference between the adjacent nodes is judged, the node with smaller distance difference is screened out, and the node is determined according to the zero line current increment value of the node under the condition that the distance difference between the adjacent nodes is also small. The position of the selected adjusting node is more accurate through the setting of the multi-layer condition, and the process of selecting the adjusting node is described below.

As an alternative embodiment, when the selection of the adjustment node is performed by the unbalanced power difference between the adjacent nodes, there are two cases, where the first case is a case where the unbalanced power difference between the adjacent nodes in the second node set is greater than or equal to the fifth threshold, that is, a case where the unbalanced power difference between the adjacent nodes in the second node set is greater, in which case the adjustment node set may be directly obtained, and the node with greater unbalanced power in the first node set may be directly selected, that is, the adjustment node set includes the first predetermined number of nodes in the first node set. The second is that when the unbalanced power difference between the adjacent nodes in the second node set is smaller than the fifth threshold, that is, when the unbalanced power difference between the adjacent nodes in the second node set is smaller, the node with the smaller unbalanced power difference between the adjacent nodes in the second node set may be stored in the combined node set for selecting the subsequent adjustment node. The method may further include obtaining a third set of combining nodes including at least one first set of neighboring combining nodes in the second set of nodes each having an unbalanced power difference between neighboring nodes that is less than a fifth threshold. I.e. the third set of combining nodes comprises at least one group of first neighboring combining nodes, and the unbalanced power difference between neighboring nodes in each neighboring combining node is smaller than the fifth threshold. Because the gap is a gap representing the gap between two points, the nodes with smaller gaps are stored as combined nodes, here represented by a third set of combined nodes. It should be noted that, the third set of combined nodes includes at least one first adjacent combined node, and the imbalance difference between adjacent nodes in each adjacent combined node is smaller than a fifth threshold, where the fifth threshold may be set according to practical application requirements and experience, and the first adjacent combined node may be formed by two nodes or may be formed by more nodes. Illustrating: assuming that the fifth threshold is 2, the unbalanced power of the node a is 100, the unbalanced power of the node b is 101, and the unbalanced power of the node c is 102, so that the differences between the node a, the node b and the node c are smaller than the fifth threshold, and therefore, the three nodes are taken as a first adjacent combined node together.

As an alternative embodiment, when the unbalanced power difference between the adjacent nodes is too small, the selection of the adjustment node is performed according to the distance difference between the adjacent nodes, that is, when the second situation exists, the distances between each node in all the first adjacent combination nodes included in the third combination node set and the transformer are calculated, so as to determine the distance difference between the adjacent nodes in each first adjacent combination node. So as to select subsequent adjusting nodes according to the distance difference. Because the nodes are selected according to the distance when the first adjacent combined node is selected, there may be a case that the distance difference between the adjacent nodes is relatively close, so the distance difference between the adjacent nodes in the first adjacent combined node is firstly determined. At this time, there are two cases, the first case is that in the case that the distance differences corresponding to the nodes in the first adjacent combined nodes are all greater than or equal to the sixth threshold, that is, in the case that the distance differences corresponding to the nodes in the first adjacent combined nodes are all great, at this time, the node to be selected is selected from the first adjacent combined nodes according to the distance between the node and the transformer, so as to perform the selection of the subsequent adjustment node. The second is that under the condition that the distance difference corresponding to the nodes in the first adjacent combined nodes is smaller than the sixth threshold, namely, under the condition that the distance difference corresponding to the nodes in the first adjacent combined nodes is not large, in order to better regulate the load, the load is selected according to the current increment value, and the finally selected regulating node is ensured to be more accurate.

As an optional embodiment, the first case is described in an unfolding manner, where in the case where the distance differences corresponding to the nodes in the first adjacent combined nodes are all greater than or equal to the sixth threshold, that is, in the case where the distance differences corresponding to the nodes in all the first adjacent combined nodes in the third combined node set are relatively greater, a fourth node set is obtained, where the fourth node set is a part of the nodes selected from the first adjacent combined nodes according to the distances between the nodes and the transformer, that is, a part of the nodes can be selected according to the distances between the nodes and the transformer as the nodes to be selected, and the node with the greater distance between the node and the transformer is preferentially selected. According to the distance between each node and the transformer, the adjusting node is selected, so that the end node with great influence on the three-phase imbalance can be treated preferentially, and the three-phase load can be adjusted in a better mode. After the selection is completed, the selected partial nodes are stored in a fourth node set, and the nodes in the fourth node set are sequentially arranged according to the unbalanced power, so that the unbalanced power difference between the adjacent nodes in the fourth node set is larger than or equal to a fifth threshold value. Obtaining a node set to be selected, wherein the node set to be selected comprises nodes in a first node set, namely nodes with unbalanced power larger than a fourth threshold value, nodes with unbalanced power differences between adjacent nodes in a second node set larger than or equal to a fifth threshold value, and nodes in a fourth node set, the nodes in the node set to be selected are sequentially arranged according to the unbalanced power, and an adjusting node set is obtained, wherein the adjusting node set comprises a first preset number of nodes in the node set to be selected.

As an optional embodiment, the second case is described in an unfolding manner, where the distance difference corresponding to the nodes in the adjacent combined nodes is smaller than the sixth threshold, that is, the distance difference corresponding to the nodes in the adjacent combined nodes in the third combined node set is smaller than the sixth threshold, a fifth combined node set is selected, where the fifth combined node set includes at least one group of second adjacent combined nodes where the distance differences between the adjacent nodes in the first adjacent combined node are smaller than the sixth threshold, that is, the fifth combined node set includes at least one group of second adjacent combined nodes where the distance differences between the adjacent nodes in the second adjacent combined nodes are smaller than the sixth threshold. In the first adjacent combined nodes, the situation that the distance difference corresponding to the existing nodes of some adjacent combined nodes is smaller than a sixth threshold value exists, and some adjacent combined nodes do not exist, so that the adjacent combined nodes with the situation are selected and marked as second adjacent combined nodes for subsequent processing, and the zero line current increment value at each node in the second adjacent combined nodes is determined. And obtaining a sixth node set, wherein the sixth node set comprises partial nodes selected according to the zero line current increment value of each node in the second adjacent combined node and the distance between each node in the first adjacent combined node and the transformer, and the nodes in the sixth node set are arranged in sequence according to the unbalanced power so that the unbalanced power difference between the adjacent nodes in the sixth node set is larger than or equal to a fifth threshold value. Obtaining a node set to be selected, wherein the node set to be selected comprises nodes in a first node set, namely nodes with unbalanced power larger than a fourth threshold value, nodes with unbalanced power differences between adjacent nodes in a second node set larger than or equal to a fifth threshold value, and nodes in a sixth node set, and obtaining an adjusting node set, wherein the adjusting node set comprises a preset number of nodes in the node set to be selected.

As an alternative embodiment, when the load on each phase of the three-phase line at the adjusting node is redistributed according to a predetermined rule, the method may further include the steps of: and in a preset period, determining the probability that a plurality of nodes are regulating nodes, selecting a preset number of nodes as final regulating nodes according to the probability, and redistributing the loads on each phase of the three-phase line at the final regulating nodes according to a preset rule. The predetermined period may be set according to practical experience and a scene, for example, the period may be one month, and the selection of the adjustment node may be performed. According to the probability that each node in a preset period is selected as the adjusting node, a preset number of nodes with high probability are selected as the final adjusting nodes, and the influence of accidental factors is avoided.

Based on the foregoing embodiment and the optional embodiments, an optional implementation is provided, and a load is taken as an example of a load of a user, and the following description is given.

The low-voltage distribution network adopts a three-phase four-wire system, and the problem of three-phase unbalance caused by uneven load distribution of single-phase loads on three phases is difficult to avoid. Along with the improvement of the living standard of people, the electric power of single-phase users is continuously increased, the power fluctuation is more frequent and remarkable, and especially along with the popularization of electric automobiles, the problem of three-phase imbalance is prominent in some areas where charging piles are connected. The problem is most serious in the low-voltage distribution network in part of areas due to large power supply radius. Thus, low voltage distribution network three-phase imbalance has been a major problem for grid companies. The three-phase imbalance means that the three-phase currents (or voltages) in the power system are not uniform in amplitude, and the amplitude difference exceeds a prescribed range.

The three-phase unbalance brings serious harm to the power system and the users, and is characterized in the following aspects:

(1) Increasing transformer losses: in the state of three-phase unbalance, when the power system operates, the DC resistance loss of the transformer winding can be increased, and the leakage magnetic flux generated by the zero sequence current can cause the increase of eddy current loss on a transformer structural member (such as a clamping piece, a pressing plate, an oil tank and the like).

(2) The operation life of the transformer is reduced: in the state of three-phase unbalance, when the power system operates, the transformer loss increases, so that the winding heats up, the temperature rises, the insulation strength decreases, and the insulation life shortens.

(3) Transformer burnout may result: in the state of three-phase unbalance, when the power system operates, the output force of the transformer is reduced, so that the output capacity can not reach the rated value, the overload capacity of the transformer is reduced, and the transformer can be burnt out under severe conditions, thereby affecting the operation stability and reliability of the power system.

(4) Increase the line power loss: under the unbalanced three-phase state, when the power system operates, three-phase current is asymmetric, loss on a wire can be increased compared with that under the balanced condition, and for a part of regional power grid, the increased loss is larger due to long power supply radius, and the increased line loss continuously brings economic loss to the power grid.

(5) Leading to line voltage anomalies: under the unbalanced three-phase state, when the power system operates, the output voltage of the low-voltage side of the transformer can be offset, overvoltage and low voltage are easily caused in the low-voltage line of the user side, and the normal work of electric equipment is influenced.

In order to solve the above problems, in the related art, the following technical solutions mainly exist for the current three-phase imbalance treatment:

(1) Manually adjusting a wiring management mode: from the economical point of view, the three-phase unbalance management in the related art mainly adopts a low-cost mode of manually adjusting wiring. The adjustment wiring operation is required to perform a pole climbing adjustment service line operation for a distribution transformer area employing overhead lines to adjust the phase to which the single-phase user load is connected.

(2) Installing an electronic three-phase load automatic regulating device: the power electronic type three-phase load automatic regulating device can realize the basic balance of the three-phase current at the outlet of the transformer by installing the power electronic regulating device at the outlet of the transformer.

However, when the above-described method is adopted to solve the problems, the following problems are caused:

(1) The manual adjustment of the wiring management mode cannot adapt to new situations: the manual adjustment wiring is the same that the wire clamp is connected to the replacement wire clamp that needs to step on the pole every time adjust, wastes time and energy, and the unbalanced problem of three-phase takes place in the high temperature weather at night in summer or the low temperature weather at night in winter in addition, step on pole adjustment wiring operation at night have a great deal of problems such as illumination deficiency, operation difficulty, personal safety. However, with the frequent occurrence of extremely hot and extremely cold weather, the continuous improvement of the requirements on the power supply quality, the continuous rise of the labor cost and the requirements on energy conservation and emission reduction, the manual mode is not suitable for new situations.

(2) The control of the power electronic type three-phase load automatic regulating device is incomplete and the economical efficiency is poor: the automatic power electronic three-phase load adjusting device can realize basic balance of three-phase current at the outlet of the transformer, but cannot redistribute the three-phase load and balance the three-phase current on a line, line loss caused by three-phase unbalance still exists, the treatment effect is not thorough, 3% loss of self-adjusting power can be caused by the device, a large amount of noise is generated in the operation process, the manufacturing cost of the device is high, and the treatment economy is poor.

Therefore, it is conceivable to adopt a three-phase load automatic adjustment method of a phase change switch type in which a three-phase load automatic adjustment device of a phase change switch type is generally adopted, and an intelligent phase change terminal is installed at the outlet of a transformer by using the phase change switch to reselect the phase to which a single-phase user is connected, and a plurality of phase change switches are controlled to automatically adjust, so that the redistribution of the single-phase load on three phases is realized, and thus, the three-phase balance is realized, the transformer loss can be effectively reduced, and the line loss can be effectively reduced. In order to better realize the adjustment of the three-phase balance, when the three-phase unbalance is treated by the automatic adjustment method of the three-phase load with the phase change switch, the more the configuration of the phase change switch is, the better the treatment effect is in principle considered from the aspect of the treatment effect, but from the aspect of economy, the more the number of the phase change switches is, the more the input cost is, the longer the time for recovering the cost is, the worse the economy is, and how to obtain a more satisfactory compromise between the treatment effect and the economy is, which is a multi-objective optimization problem in mathematical essence, and the number and the positions of the phase change switches need to be optimally configured. Because the application time of the phase change switch in the three-phase imbalance treatment is not long, the related practice and theoretical research work is less, how to determine the installation positions of the phase change switches and the number of the phase change switches are needed, and the practical guidance scheme with operability is lacking in the selection of the installation positions of the phase change switches. The method for determining the installation position and the number of the phase change switches in the related art needs to acquire complete information of the low-voltage line, namely, information of each load on a node, and also acquires various information including transformer parameters, line parameters, long-time load curves of each single-phase user load and the like, wherein the information cannot be completely acquired, the acquisition cost of the information is relatively high, and the method is difficult to apply to actual three-phase imbalance management work.

In view of this, an alternative embodiment of the present invention provides a technical solution for determining the installation position of a phase change switch with better feasibility and economy, so as to solve the above problems in the automatic adjustment method of a phase change switch type three-phase load in the related art, and the following details of the alternative embodiment of the present invention are described:

1. for a three-phase four-wire low-voltage line, single-phase user loads are intensively connected into one of three phases of the low-voltage line at each node, the centralized connection nodes are usually all towers for overhead low-voltage lines, underground cables are usually low-voltage cable branch boxes, a movable low-voltage monitoring device is arranged in front of the centralized connection points, continuous three-phase voltage data before each node of the low-voltage line and continuous current data of three-phase current and zero line current flowing through the node are obtained, namely all information required for determining the installation position of a phase change switch is obtained through the movable low-voltage monitoring device, the information is obtained from the node, the information is not required to be obtained respectively for each single-phase user load, the obtained information is convenient and fast, the obtained information can be detached for multiple times, and the economy of the obtained information is improved.

Fig. 2 is a schematic diagram of a three-phase four-wire low voltage line connection according to an alternative embodiment of the present invention, as shown in fig. 2: 100 is a transformer, the high voltage is changed into low voltage, the low voltage line adopts three-phase four-wire system, four lines are A, B, C three phase lines and zero line N respectively, A, B, C three-phase voltage is the voltage difference between A, B, C three phase lines and zero line N. 101. 102 is a node for short, where a plurality of single-phase user loads are connected to two single-phase user load concentrated access points on a low-voltage line. Before 101, 102, two sets of mobile low pressure monitoring devices 201 and 202 are installed, respectively. The mobile low-voltage monitoring device 201 is connected to A, B, C three phase lines and a neutral line N through connecting lines 401, 402, 403 and 404 and is used for measuring A, B, C three-phase voltage before the node 101, and current sensors 304, 303, 301 and 302 are used for respectively measuring A, B, C three-phase current and neutral line current flowing through the node 101.

2. Assuming that the line has n nodes in total, n+1 sets of mobile low-voltage monitoring devices are installed, the time of the mobile low-voltage monitoring devices is synchronous, and the total current of three phases in a certain node can be determined through the two sets of mobile low-voltage monitoring devices.

Assume that the A, B, C three-phase total current flowing through the nth node is I _n ^A 、I _n ^B 、I _n ^C A, B, C three phases flowing through the n+1th node have total currents of I _n+1 ^A 、I _n+1 ^B 、I _n+1 ^C Then the total load current I on the three phases in the nth node _n ^AL 、I _n ^BL 、I _n ^CL The method comprises the following steps of:

let the zero line current flowing through the nth node be I _n ^N Zero line current flowing through the n+1th node is I _n+1 ^N Then the zero line current increment I contributed by the nth node _n ^NL The method comprises the following steps:

a, B, C three-phase voltage U of nth node _n ^AN 、U _n ^BN 、U _n ^CN Can be obtained through direct measurement of a movable low-voltage monitoring device, and the specific method is as follows: a, B, C three-phase voltage U of nth node _n ^AN 、U _n ^BN 、U _n ^CN By measuring the voltage U of the A-phase connection 401 of the nth node _n ^A Voltage U of B-connected wiring 402 _n ^B Voltage U of C-connected wiring 404 _n ^C Voltage U of connection 403 to N _n ^N The voltage difference between them is obtained:

3. according to the power of the transformer, the number M of the phase change switches to be installed is determined, the number of the phase change nodes selected afterwards is smaller than or equal to M, the total number of the nodes to be installed of the phase change switches is determined according to the power of the transformer, the difficulty of selecting the installation positions of the phase change switches is reduced, and meanwhile economical efficiency is guaranteed.

4. In days, three-phase imbalance remediation zone selection is performed according to the obtained data as follows:

(1) When flowing through the 1 st node of the line, i.e. the node nearest to the transformer, the three phases A, B, C of the node are subjected to three-phase current I ₁ ^A 、I ₁ ^B 、I ₁ ^C Maximum value of (2)And minimum->The difference between divided by the maximumExceeding the threshold delta _TH And when the phase change switch position determining process is started: />

(2) Finding the A, B, C three-phase voltage U on the line _n ^AN 、U _n ^BN 、U _n ^CN Maximum value of (2)And minimum->The difference between them exceeds a threshold DeltaU _TH Node->

(3) Finding the total load current I on three phases within a node in these nodes _n ^AL 、I _n ^BL 、I _n ^CL Maximum value of (2)And minimum->Nodes with differences exceeding a threshold

(4) The nodes found in the steps (2) and (3) are candidate positions for installing the phase change switch, then the adjusting nodes needing unbalance management are screened out, when the number of the nodes found in the steps (2) and (3) is larger than the preset number, the installation priority is determined according to the following indexes in the candidate positions, and the adjusting nodes are selected:

a) N-th node A, B, C three-phase voltage U _n ^AN 、U _n ^BN 、U _n ^CN Maximum value of (2)And minimum->Difference between them and total load current I on three phases in the nth node _n ^AL 、I _n ^BL 、I _n ^CL Maximum value of (2)And minimum->The product of the differences between them, denoted as the unbalanced power P _b ： The greater the unbalanced power is, the higher the installation priority is, and when the unbalanced power is greater than a certain preset threshold, the node with the greater unbalanced power is directly selected as the adjusting node, and the adjusting node is determined by the unbalanced power, so that the installation position of the phase change switch can be determined, and the nearby adjustment of the three-phase unbalance is realized.

b) The distance from the node to the transformer is higher when unbalanced power approaches, namely, when the unbalanced power difference between the nodes is smaller, the installation priority is higher when the distance from the node to the transformer is longer, the adjusting node is determined according to the distance between the node and the transformer, and the terminal node with great influence on three-phase unbalance is treated preferentially.

c) Under the condition that unbalanced power and the distance from the transformer are close, the node with larger zero line current increment in the node can be preferentially selected as an adjusting node, the adjusting node is determined according to the zero line current increment data in each node, and the node with large zero line current increment which has great influence on three-phase unbalance is preferentially treated.

(5) And selecting M nodes with highest priority as adjusting nodes according to the installation priority, namely, presetting nodes needing to install the phase change switch.

5. Calculating the probability p of the selected regulating node of each node according to the regulating node selection result in a period of time, wherein the probability of the selected regulating node is the number N of times of being selected as the regulating node for each node _n ^s Divided by the total number of days monitored, N _day I.e. p=n _n ^s /N _day . According to the power of the transformer, determining the number M of phase change switchboards M to be installed, namely the number M of regulating nodes needing to redistribute the load, and selecting M of the maximum installation probability p from all nodes The node is used as a node needing to be provided with a phase change switch to redistribute load, the phase change switch is arranged at the position of the adjusting node according to the probability that each node is selected as the adjusting node in a period of time and is used as the basis of the selection of each node as the adjusting node, and the influence of accidental factors is avoided.

By the alternative embodiments, at least the following advantages can be achieved:

(1) By installing a mobile low-voltage monitoring device, the device is mobile rather than fixed, the monitoring can be detached and reused after completion, and the device can acquire three-phase voltage continuously in a period of time of each node of a low-voltage line and current data of each accessed single-phase user at one time, acquire all information required by three-phase unbalance adjustment, realize acquisition of all information required by three-phase unbalance adjustment at lower cost, and have remarkable economic advantage in acquisition of information;

(2) According to the unbalanced power, the distance from the node to the transformer and the zero line current increment in the node, the adjusting node is determined, the adjusting node is further determined, the priority of installing the phase change switches is determined, the installation positions of the phase change switches with the designated number are selected according to the priority, on the premise that the installation economy of the phase change switches is met, the adjacent adjustment of three-phase unbalance is realized, the overall three-phase balance of a low-voltage line can be realized, the three-phase balance on each section of the low-voltage line can be realized, the transformer loss is reduced, and the line loss caused by the three-phase unbalance is greatly reduced.

It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present invention is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present invention. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present invention.

From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising several instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method of the various embodiments of the present invention.

Example 2

According to an embodiment of the present invention, there is also provided an apparatus for implementing the above load adjustment method, and fig. 3 is a block diagram of a load adjustment apparatus according to an embodiment of the present invention, as shown in fig. 3, including: the determining module 31, the first acquiring module 32, the second acquiring module 33 and the distributing module 34 are described in detail below.

A determining module 31, configured to determine three current values and three voltage values corresponding to three phases on the three-phase line at the plurality of nodes; a first obtaining module 32, connected to the determining module 31, for obtaining current differences between maximum current values and minimum current values among three current values corresponding to three phases on the three-phase line at the plurality of nodes, and voltage differences between maximum voltage values and minimum voltage values among the three voltage values; a second obtaining module 33, connected to the first obtaining module 32, for obtaining a set of adjustment nodes, where the set of adjustment nodes includes a predetermined number of nodes whose current difference is greater than a first threshold and whose voltage difference is greater than a second threshold; and the distribution module 34 is connected to the second obtaining module 33, and is configured to redistribute the load on each phase of the three-phase line at each node in the adjustment node set according to a predetermined rule.

Here, the above-mentioned determining module 31, the first obtaining module 32, the second obtaining module 33, and the distributing module 34 correspond to steps S102 to S108 in the implementation of the load adjusting method, and the plurality of modules are the same as the examples and application scenarios implemented by the corresponding steps, but are not limited to those disclosed in the above-mentioned embodiment 1.

Example 3

Embodiments of the present disclosure may provide an electronic device, which may be a terminal or a server. In this embodiment, the electronic device may be any one of a group of computer terminals as one type of terminal. Alternatively, in this embodiment, the terminal may be a terminal device such as a mobile terminal.

Alternatively, in this embodiment, the terminal may be located in at least one network device among a plurality of network devices of the computer network.

Alternatively, fig. 4 is a block diagram illustrating a structure of a terminal according to an exemplary embodiment. As shown in fig. 4, the terminal may include: one or more (only one is shown) processors 41, a memory 42 for storing processor-executable instructions; wherein the processor is configured to execute instructions to implement the load regulation method of any of the above.

The memory may be used to store software programs and modules, such as program instructions/modules corresponding to the load adjustment methods and apparatuses in the embodiments of the present disclosure, and the processor executes the software programs and modules stored in the memory, thereby performing various functional applications and data processing, that is, implementing the load adjustment methods described above. The memory may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory may further include memory remotely located relative to the processor, which may be connected to the computer terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The processor may call the information and the application program stored in the memory through the transmission device to perform the following steps: determining three current values and three voltage values corresponding to three phases on three-phase lines at a plurality of nodes; obtaining current difference values of maximum current values and minimum current values in three current values corresponding to three phases on three-phase lines at a plurality of nodes, and voltage difference values of maximum voltage values and minimum voltage values in three voltage values; acquiring an adjusting node set, wherein the adjusting node set comprises a preset number of nodes, the current difference value of which is larger than a first threshold value and the voltage difference value of which is larger than a second threshold value, in a plurality of nodes; and reallocating the load on each phase of the three-phase line at each node in the regulation node set according to a preset rule.

Optionally, the above processor may further execute program code for: determining three current values and three voltage values corresponding to three phases on three-phase lines at a plurality of nodes comprises: three current values corresponding to three phases on a three-phase line at a preset node are obtained, wherein the preset node is the node closest to the transformer in a plurality of nodes; obtaining a first current difference value between a maximum current value and a minimum current value in three current values corresponding to three phases on a three-phase line at a preset node; acquiring a ratio between the first current difference value and a maximum current value corresponding to a preset node; and under the condition that the ratio is larger than a third threshold value, determining three current values and three voltage values corresponding to three phases on the three-phase line at the plurality of nodes.

Optionally, the above processor may further execute program code for: acquiring a set of adjustment nodes, comprising: obtaining a first node set under the condition that the number of nodes with current difference values larger than a first threshold value and voltage difference values larger than a second threshold value in the plurality of nodes is larger than or equal to a preset number, wherein the first node set comprises nodes with current difference values larger than the first threshold value and voltage difference values larger than the second threshold value in the plurality of nodes; determining unbalanced power corresponding to each node in the first node set, and arranging the nodes in the first node set in sequence according to the unbalanced power; and acquiring a regulating node set in the condition that the number of nodes with unbalanced power larger than a fourth threshold value is larger than or equal to a preset number, wherein the regulating node set comprises the first preset number of nodes in the first node set.

Optionally, the above processor may further execute program code for: under the condition that the number of nodes with unbalanced power larger than a fourth threshold value is smaller than a preset number, a second node set is obtained, wherein the second node set comprises nodes with unbalanced power smaller than or equal to the fourth threshold value in the first node set, and the nodes in the second node set are arranged in sequence according to the unbalanced power; determining an unbalanced power gap between adjacent nodes in the second set of nodes; and under the condition that the unbalanced power difference between the adjacent nodes in the second node set is greater than or equal to a fifth threshold value, acquiring an adjusting node set, wherein the adjusting node set comprises the first preset number of nodes in the first node set.

Optionally, the above processor may further execute program code for: selecting a third combined node set under the condition that the unbalanced power difference between adjacent nodes in the second node set is smaller than a fifth threshold value, wherein the third combined node set comprises at least one group of first adjacent combined nodes, and the unbalanced power difference between the adjacent nodes in the second node set is smaller than the fifth threshold value; determining the distance between each node in the first adjacent combined nodes and the transformer, and arranging the nodes in the first adjacent combined nodes in sequence according to the distance; determining a distance difference between adjacent nodes in the first adjacent combined node; acquiring a node set to be selected according to the distance difference, wherein the nodes in the node set to be selected are arranged in sequence according to the unbalanced power; and acquiring a regulating node set, wherein the regulating node set comprises the first preset number of nodes in the node set to be selected.

Optionally, the above processor may further execute program code for: according to the distance difference, acquiring a node set to be selected, including: under the condition that the distance difference between adjacent nodes in the first adjacent combined nodes is larger than or equal to a sixth threshold value, acquiring a fourth node set, wherein the fourth node set comprises partial nodes selected according to the distance between each node and the transformer in the first adjacent combined nodes, and arranging the nodes in the fourth node set in sequence according to the unbalanced power so that the unbalanced power difference between the adjacent nodes in the fourth node set is larger than or equal to the fifth threshold value; and obtaining a node set to be selected, wherein the node set to be selected comprises nodes in a first node set, nodes with unbalanced power differences between adjacent nodes in a second node set being greater than or equal to a fifth threshold value, and nodes in a fourth node set, and the nodes in the node set to be selected are sequentially arranged according to the unbalanced power.

Optionally, the above processor may further execute program code for: according to the distance difference, acquiring a node set to be selected, including: selecting a fifth combination node set under the condition that the distance difference between adjacent nodes in the first adjacent combination nodes is smaller than a sixth threshold value, wherein the fifth combination node set comprises at least one group of second adjacent combination nodes of which the distance differences between adjacent nodes in the first adjacent combination nodes are smaller than the sixth threshold value; determining zero line current increment values at all nodes in the second adjacent combined nodes, and arranging the nodes in the second adjacent combined nodes in sequence according to the zero line current increment values; obtaining a sixth node set, wherein the sixth node set comprises partial nodes selected according to zero line current increment values of all nodes in a second adjacent combined node and distances between all nodes in a first adjacent combined node and a transformer, and the nodes in the sixth node set are arranged in sequence according to unbalanced power, so that unbalanced power differences between adjacent nodes in the sixth node set are all larger than or equal to a fifth threshold; and obtaining a node set to be selected, wherein the node set to be selected comprises nodes in a first node set, nodes with unbalanced power differences between adjacent nodes in a second node set being greater than or equal to a fifth threshold value, and nodes in a sixth node set, and the nodes in the node set to be selected are arranged in sequence according to the unbalanced power.

Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be implemented by a program for instructing a terminal device to execute in association with hardware, the program may be stored in a computer readable storage medium, and the storage medium may include: flash disk, read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), magnetic or optical disk, and the like.

Example 4

In an exemplary embodiment, there is also provided a computer-readable storage medium comprising instructions that, when executed by a processor of a terminal, enable the terminal to perform the load adjustment method of any one of the above. Alternatively, the computer readable storage medium may be a non-transitory computer readable storage medium, for example, a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

Alternatively, in the present embodiment, the above-described computer-readable storage medium may be used to store the program code executed by the load adjustment method provided in the above-described embodiment.

Alternatively, in this embodiment, the above-mentioned computer-readable storage medium may be located in any one of the computer terminals in the computer terminal group in the computer network, or in any one of the mobile terminals in the mobile terminal group.

Optionally, in the present embodiment, the computer readable storage medium is configured to store program code for performing the steps of: determining three current values and three voltage values corresponding to three phases on three-phase lines at a plurality of nodes; obtaining current difference values of maximum current values and minimum current values in three current values corresponding to three phases on three-phase lines at a plurality of nodes, and voltage difference values of maximum voltage values and minimum voltage values in three voltage values; acquiring an adjusting node set, wherein the adjusting node set comprises a preset number of nodes, the current difference value of which is larger than a first threshold value and the voltage difference value of which is larger than a second threshold value, in a plurality of nodes; and reallocating the load on each phase of the three-phase line at each node in the regulation node set according to a preset rule.

Optionally, in the present embodiment, the computer readable storage medium is configured to store program code for performing the steps of: determining three current values and three voltage values corresponding to three phases on three-phase lines at a plurality of nodes comprises: three current values corresponding to three phases on a three-phase line at a preset node are obtained, wherein the preset node is the node closest to the transformer in a plurality of nodes; obtaining a first current difference value between a maximum current value and a minimum current value in three current values corresponding to three phases on a three-phase line at a preset node; acquiring a ratio between the first current difference value and a maximum current value corresponding to a preset node; and under the condition that the ratio is larger than a third threshold value, determining three current values and three voltage values corresponding to three phases on the three-phase line at the plurality of nodes.

Optionally, in the present embodiment, the computer readable storage medium is configured to store program code for performing the steps of: acquiring a set of adjustment nodes, comprising: obtaining a first node set under the condition that the number of nodes with current difference values larger than a first threshold value and voltage difference values larger than a second threshold value in the plurality of nodes is larger than or equal to a preset number, wherein the first node set comprises nodes with current difference values larger than the first threshold value and voltage difference values larger than the second threshold value in the plurality of nodes; determining unbalanced power corresponding to each node in the first node set, and arranging the nodes in the first node set in sequence according to the unbalanced power; and acquiring a regulating node set in the condition that the number of nodes with unbalanced power larger than a fourth threshold value is larger than or equal to a preset number, wherein the regulating node set comprises the first preset number of nodes in the first node set.

Optionally, in the present embodiment, the computer readable storage medium is configured to store program code for performing the steps of: under the condition that the number of nodes with unbalanced power larger than a fourth threshold value is smaller than a preset number, a second node set is obtained, wherein the second node set comprises nodes with unbalanced power smaller than or equal to the fourth threshold value in the first node set, and the nodes in the second node set are arranged in sequence according to the unbalanced power; determining an unbalanced power gap between adjacent nodes in the second set of nodes; and under the condition that the unbalanced power difference between the adjacent nodes in the second node set is greater than or equal to a fifth threshold value, acquiring an adjusting node set, wherein the adjusting node set comprises the first preset number of nodes in the first node set.

Optionally, in the present embodiment, the computer readable storage medium is configured to store program code for performing the steps of: selecting a third combined node set under the condition that the unbalanced power difference between adjacent nodes in the second node set is smaller than a fifth threshold value, wherein the third combined node set comprises at least one group of first adjacent combined nodes, and the unbalanced power difference between the adjacent nodes in the second node set is smaller than the fifth threshold value; determining the distance between each node in the first adjacent combined nodes and the transformer, and arranging the nodes in the first adjacent combined nodes in sequence according to the distance; determining a distance difference between adjacent nodes in the first adjacent combined node; acquiring a node set to be selected according to the distance difference, wherein the nodes in the node set to be selected are arranged in sequence according to the unbalanced power; and acquiring a regulating node set, wherein the regulating node set comprises the first preset number of nodes in the node set to be selected.

Optionally, in the present embodiment, the computer readable storage medium is configured to store program code for performing the steps of: according to the distance difference, acquiring a node set to be selected, including: under the condition that the distance difference between adjacent nodes in the first adjacent combined nodes is larger than or equal to a sixth threshold value, acquiring a fourth node set, wherein the fourth node set comprises partial nodes selected according to the distance between each node and the transformer in the first adjacent combined nodes, and arranging the nodes in the fourth node set in sequence according to the unbalanced power so that the unbalanced power difference between the adjacent nodes in the fourth node set is larger than or equal to the fifth threshold value; and obtaining a node set to be selected, wherein the node set to be selected comprises nodes in a first node set, nodes with unbalanced power differences between adjacent nodes in a second node set being greater than or equal to a fifth threshold value, and nodes in a fourth node set, and the nodes in the node set to be selected are sequentially arranged according to the unbalanced power.

Optionally, in the present embodiment, the computer readable storage medium is configured to store program code for performing the steps of: according to the distance difference, acquiring a node set to be selected, including: selecting a fifth combination node set under the condition that the distance difference between adjacent nodes in the first adjacent combination nodes is smaller than a sixth threshold value, wherein the fifth combination node set comprises at least one group of second adjacent combination nodes of which the distance differences between adjacent nodes in the first adjacent combination nodes are smaller than the sixth threshold value; determining zero line current increment values at all nodes in the second adjacent combined nodes, and arranging the nodes in the second adjacent combined nodes in sequence according to the zero line current increment values; obtaining a sixth node set, wherein the sixth node set comprises partial nodes selected according to zero line current increment values of all nodes in a second adjacent combined node and distances between all nodes in a first adjacent combined node and a transformer, and the nodes in the sixth node set are arranged in sequence according to unbalanced power, so that unbalanced power differences between adjacent nodes in the sixth node set are all larger than or equal to a fifth threshold; and obtaining a node set to be selected, wherein the node set to be selected comprises nodes in a first node set, nodes with unbalanced power differences between adjacent nodes in a second node set being greater than or equal to a fifth threshold value, and nodes in a sixth node set, and the nodes in the node set to be selected are arranged in sequence according to the unbalanced power.

In an exemplary embodiment, a computer program product is also provided, which, when executed by a processor of an electronic device, enables the electronic device to perform the load adjustment method of any one of the above.

The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.

In the several embodiments provided in the present application, it should be understood that the disclosed technology may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.

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 units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform 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 Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims

1. A load adjustment method, comprising:

determining three current values and three voltage values corresponding to three phases on three-phase lines at a plurality of nodes;

obtaining current difference values of maximum current values and minimum current values in three current values corresponding to three phases on three-phase lines at a plurality of nodes, and voltage difference values of maximum voltage values and minimum voltage values in three voltage values;

acquiring an adjusting node set, wherein the adjusting node set comprises a preset number of nodes, the current difference value of which is larger than a first threshold value and the voltage difference value of which is larger than a second threshold value, in a plurality of nodes;

and reallocating the load on each phase of the three-phase line at each node in the regulation node set according to a preset rule.

2. The method of claim 1, wherein determining three current values and three voltage values corresponding to three phases on a three phase line at a plurality of nodes comprises:

three current values corresponding to three phases on a three-phase line at a preset node are obtained, wherein the preset node is the node closest to the transformer in the plurality of nodes;

Obtaining a first current difference value between a maximum current value and a minimum current value in three current values corresponding to three phases on a three-phase line at the preset node;

acquiring a ratio between the first current difference value and a maximum current value corresponding to the preset node;

and under the condition that the ratio is larger than a third threshold value, determining three current values and three voltage values corresponding to three phases on the three-phase line at the plurality of nodes.

3. The method of claim 1, wherein obtaining the set of adjustment nodes comprises:

obtaining a first node set when the current difference value is greater than a first threshold value and the number of nodes with the voltage difference value greater than a second threshold value is greater than or equal to the preset number in the plurality of nodes, wherein the first node set comprises nodes with the current difference value greater than the first threshold value and the voltage difference value greater than the second threshold value in the plurality of nodes;

determining unbalanced power corresponding to each node in the first node set, and arranging the nodes in the first node set in sequence according to the unbalanced power;

and acquiring the regulating node set under the condition that the number of nodes with unbalanced power larger than a fourth threshold value is larger than or equal to the preset number, wherein the regulating node set comprises the first preset number of nodes in the first node set.

4. A method according to claim 3, comprising:

acquiring a second node set under the condition that the number of nodes with unbalanced power larger than a fourth threshold value is smaller than the preset number, wherein the second node set comprises nodes with unbalanced power smaller than or equal to the fourth threshold value in the first node set, and the nodes in the second node set are arranged in sequence according to the unbalanced power;

determining an unbalanced power gap between adjacent nodes in the second set of nodes;

and acquiring the regulating node set under the condition that the unbalanced power difference between the adjacent nodes in the second node set is larger than or equal to a fifth threshold value, wherein the regulating node set comprises the first preset number of nodes in the first node set.

5. The method according to claim 4, comprising:

selecting a third combined node set under the condition that the unbalanced power difference between the adjacent nodes in the second node set is smaller than a fifth threshold value, wherein the third combined node set comprises at least one group of first adjacent combined nodes of which the unbalanced power difference between the adjacent nodes in the second node set is smaller than the fifth threshold value;

Determining the distance between each node in the first adjacent combined nodes and the transformer, and arranging the nodes in the first adjacent combined nodes in sequence according to the distance;

determining a distance difference between adjacent nodes in the first adjacent combined node;

acquiring a node set to be selected according to the distance difference, wherein the nodes in the node set to be selected are arranged in sequence according to the unbalanced power;

and acquiring the adjusting node set, wherein the adjusting node set comprises the previous preset number of nodes in the node set to be selected.

6. The method of claim 5, wherein obtaining a set of candidate nodes based on the distance difference comprises:

obtaining a fourth node set under the condition that the distance difference between adjacent nodes in the first adjacent combined node is larger than or equal to a sixth threshold value, wherein the fourth node set comprises partial nodes selected according to the distance between each node and the transformer in the first adjacent combined node, and the nodes in the fourth node set are arranged in sequence according to the unbalanced power so that the unbalanced power difference between the adjacent nodes in the fourth node set is larger than or equal to the fifth threshold value;

Obtaining a node set to be selected, wherein the node set to be selected comprises nodes in the first node set, nodes with unbalanced power differences between adjacent nodes in the second node set being greater than or equal to a fifth threshold value, and nodes in the fourth node set, and the nodes in the node set to be selected are sequentially arranged according to the unbalanced power.

7. The method of claim 5, wherein obtaining a set of candidate nodes based on the distance difference comprises:

selecting a fifth combination node set under the condition that the distance difference between adjacent nodes in the first adjacent combination nodes is smaller than a sixth threshold value, wherein the fifth combination node set comprises at least one group of second adjacent combination nodes of which the distance differences between adjacent nodes in the first adjacent combination nodes are smaller than the sixth threshold value;

determining zero line current increment values at all nodes in the second adjacent combined nodes, and arranging the nodes in the second adjacent combined nodes in sequence according to the zero line current increment values;

obtaining a sixth node set, wherein the sixth node set comprises partial nodes selected according to the zero line current increment value of each node in the second adjacent combined node and the distance between each node in the first adjacent combined node and the transformer, and the nodes in the sixth node set are arranged in sequence according to the unbalanced power so that the unbalanced power difference between the adjacent nodes in the sixth node set is greater than or equal to a fifth threshold;

Obtaining a node set to be selected, wherein the node set to be selected comprises nodes in the first node set, nodes with unbalanced power differences between adjacent nodes in the second node set being greater than or equal to a fifth threshold value, and nodes in the sixth node set, and the nodes in the node set to be selected are sequentially arranged according to the unbalanced power.

8. A load adjustment device, comprising:

the determining module is used for determining three current values and three voltage values corresponding to three phases on the three-phase line at the plurality of nodes;

the first acquisition module is used for acquiring current difference values of maximum current values and minimum current values in three current values corresponding to three phases of three-phase lines at the plurality of nodes and voltage difference values of maximum voltage values and minimum voltage values in the three voltage values;

a second acquisition module configured to acquire a set of adjustment nodes, wherein the set of adjustment nodes includes a predetermined number of nodes of the plurality of nodes for which the current difference is greater than a first threshold and the voltage difference is greater than a second threshold;

and the distribution module is used for redistributing the loads on each phase of the three-phase line at each node in the regulation node set according to a preset rule.

9. An electronic device, comprising:

a processor;

a memory for storing the processor-executable instructions;

wherein the processor is configured to execute the instructions to implement the load regulation method of any one of claims 1 to 7.

10. A computer readable storage medium, characterized in that instructions in the computer readable storage medium, when executed by a processor of an electronic device, enable the electronic device to perform the load regulation method of any one of claims 1 to 7.