CN115189355B - Snowflake grid type grid structure construction method and device for three-station six-line mode power distribution network - Google Patents

Abstract

The invention discloses a method and device for constructing a snowflake grid structure of a three-station six-wire distribution network, wherein the method includes: determining a target contact node matching the preset three substations; wherein each of the substations The substation corresponds to two power supply lines; based on the target contact node, the power supply lines of the three substations are connected to obtain the grid connection form corresponding to the three substations; wherein, the grid connection form is a polygonal snowflake Format closed-loop power distribution ring network; based on the grid connection form, construct the distribution network grid of the three substations to obtain the target power distribution ring network, so as to supply power to the target load object through the target power distribution ring network .

Description

A snowflake grid construction method and device for a three-station six-wire distribution network

technical field

The present invention relates to the field of power distribution technology, in particular, to a method and device for constructing a snowflake grid structure of a three-station six-wire distribution network.

Background technique

In the existing power supply mode, users in the power supply area are often supplied with power through substations. For power supply areas with certain power supply reliability requirements, ring network power distribution is often used to supply power to the power supply area. Power distribution, for example, single ring power distribution (also called single ring).

Here, as shown in Figure 1, it is a schematic diagram of the grid structure of the single ring network, wherein, the single ring network includes a plurality of ring network cabinets, it should be understood that the ring network cabinets are used to supply power to users in the power supply area A power distribution device for power distribution, which includes a load switch or a circuit breaker for shutting off the power supply line of the substation. The "N-1 inspection principle" is often adopted when power supply is based on the single ring network, so as to ensure that the load in the single ring network can be smoothly transferred when a fault occurs in the single ring network. However, the load rate of the single ring network often can only reach 50%, resulting in a low utilization rate of power supply resources, and, due to the change of users in the power supply area, the load situation will also change, so the single ring network is often Unreasonable segmentation of grid structure, complex connection, invalid connection, etc., cannot adapt well to changes in load conditions.

Contents of the invention

The present invention provides a snowflake grid construction method and device for a three-station six-wire distribution network.

In the first aspect, the present invention provides a method for constructing a snowflake grid structure of a three-station six-wire distribution network, the method specifically includes:

Determining target contact nodes matching the preset three substations; wherein, each of the substations corresponds to two power supply lines;

Connect the power supply lines of the three substations based on the target contact node to obtain the grid connection form corresponding to the three substations; wherein, the grid connection form is a polygonal closed-loop power distribution ring network;

Based on the grid connection form, the distribution grid of the three substations is constructed to obtain a target power distribution ring network, so as to supply power to target load objects through the target power distribution ring network.

The target contact nodes include inter-station contact nodes and intra-station contact nodes; the determination of target contact nodes matching the three substations includes:

Determining an in-station contact node for each of the substations; wherein, the in-station contact node is a node for contacting the corresponding two-circuit power supply lines of the substation;

determining an inter-station contact node for contacting each of the substations to obtain an inter-station contact node;

The target contact node is determined based on the intra-station contact node and the inter-station contact node.

The above-mentioned target contact nodes include inter-station contact nodes and intra-station contact nodes, so as to realize the connection between the above three substations to form an independent ring-mesh feeder cluster and build a stronger, easier-to-expand, grid-based energy Configure the platform.

The target contact node includes an inter-station contact node and an intra-station contact node; the target contact node is used to contact the power supply lines of the three substations to obtain the grid connection form corresponding to the three substations, including:

Based on the in-station contact node, perform in-station contact for each of the substations to obtain first contact information;

Based on the inter-station contact node, perform inter-station contact for each of the substations to obtain second contact information; wherein the second contact information is used to instruct the power supply line corresponding to each substation to communicate with the other two substations;

Based on the first contact information and the second contact information, grid connection forms corresponding to the three substations are determined.

The above-mentioned target contact nodes include inter-station contact nodes and intra-station contact nodes. Based on the inter-station contact nodes and intra-station contact nodes, the above three substations can be connected to make the division of the determined grid connection form more reasonable.

The method of contacting the power supply lines of the three substations based on the target contact node to obtain the grid connection forms corresponding to the three substations also includes:

determining the target contact node as a polygon vertex;

The polygonal snowflake format closed-loop power distribution ring network is constructed according to the polygonal vertices.

The target power distribution ring network constructed based on the above-mentioned snowflake grid structure meets the "N-1 test principle", and the load rate of the target power distribution ring network can reach 83%, thus achieving a high utilization rate of power supply resources. At the same time, the topological structure is concise and clear, the grid structure is flexible and reliable, and it supports large-scale load transfer, which lays a solid foundation for the function of the grid structure. The concept extends the snowflake shape's characteristics of both rotational symmetry and bilateral symmetry. Here, the snowflake grid structure has the attributes of high inclusiveness and strong adaptability: 1) inclusiveness: it has the characteristics of flexibly accepting distributed power sources, electric vehicles, energy storage, etc. The uncertainty of power generation and consumption behavior at both ends of the user supports the access, withdrawal and interaction of various market entities. Based on the above characteristics and attributes, the snowflake grid structure is specifically manifested in five characteristics: safe and reliable, cost-effective, green and low-carbon, high-quality service, and optimized interaction.

The target load object includes a multi-power source load object; wherein, the multi-power source load object corresponds to a plurality of substations; the power supply to the target load object through the target power distribution ring network includes:

determining a plurality of substations corresponding to the multi-power source load object;

connecting the multi-power source load objects in series in the power supply lines of the multiple substations, and determining any substation in the multiple substations as a target substation, so that the target substation passes through the target power distribution ring network Power is supplied to the multi-source load object.

For the multi-power source load object, the multi-power source load object can be connected in series to multiple inter-station contact nodes to meet the requirements of the multi-power source load object for the power supply demand and improve the power supply stability.

There are multiple target power distribution ring networks, wherein the target power distribution ring network includes a first power distribution ring network and a second power distribution ring network; the method further includes:

determining a first target contact node among the target contact nodes of the first power distribution ring network, and determining a second target contact node among the target contact nodes of the second power distribution ring network;

Based on the first target contact node and the second target contact node, the first power distribution ring network and the second power distribution ring network are connected to obtain a communication channel.

The first power distribution ring network and the second power distribution ring network can be connected through the communication channel, thereby strengthening the communication between multiple power supply areas.

The method further includes: in the case of detecting a load transfer request of the first power distribution ring network, determining whether the second power distribution ring network meets the load transfer requirement;

In the case that the second power distribution ring network meets the load transfer requirement, send a load transfer instruction to the second power distribution ring network, so that the second power distribution ring network can send the second power distribution ring network to the first power distribution ring network through the communication channel. A target load object corresponding to a power distribution ring network supplies power.

When the above-mentioned load transfer requirements are detected, the load transfer and support between multiple target distribution ring networks can be realized through the communication channel, thus adapting to the change of load in urban planning with user migration, reducing grid planning and The cost of grid construction.

The power supply to the target load object through the target power distribution ring network includes:

determining a target current corresponding to the target load object, where the target current includes a direct current or an alternating current;

If the target current does not match the current provided by the target power distribution ring network, adjust the current provided by the target power distribution ring network to the target current, and supply the target current to the target load object.

The AC current can be converted into a DC current through the flexible multi-state switch, and directly supplied to the target load object without connecting a converter to convert the AC current.

In the second aspect, the present invention also provides a grid construction device for a three-station six-wire distribution network, including:

A determination unit, configured to determine target contact nodes matching the preset three substations; wherein, each of the substations corresponds to two power supply lines;

A contact unit, configured to contact the power supply lines of the three substations based on the target contact node, to obtain the grid connection form corresponding to the three substations; wherein, the grid contact form is a polygonal closed-loop power distribution Ring;

The construction unit is configured to construct the distribution network structure of the three substations based on the connection form of the network structure to obtain a target power distribution ring network, so as to supply power to target load objects through the target power distribution ring network.

In a third aspect, the present invention also provides a computer device, including: a processor, a memory, and a bus, the memory stores machine-readable instructions executable by the processor, and when the computer device is running, the processor and The memories communicate with each other through a bus, and when the machine-readable instructions are executed by the processor, the above-mentioned first aspect, or the steps in any possible implementation manner of the first aspect are executed.

In a fourth aspect, the present invention also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the above-mentioned first aspect, or any one of the first aspects steps in a possible implementation.

Advantage and positive effect of the present invention are:

The invention provides a method and device for constructing a snowflake grid frame of a three-station six-wire distribution network. The grid structure of the distribution network can be constructed based on the preset three substations, and the three substations can be connected through the target contact node to obtain a polygonal snowflake-style closed-loop power distribution ring network. Based on the above-mentioned snowflake-style grid structure construction The target power distribution ring network meets the "N-1 test principle", and the load rate of the target power distribution ring network can reach 83%, thus achieving a high utilization rate of power supply resources.

At the same time, the topology structure of the grid structure of the distribution network in the present invention is concise and clear, the grid structure is flexible and reliable, supports large-scale transfer of loads, and consolidates the basis for the function of the grid structure. The concept extends the snowflake shape's characteristics of both rotational symmetry and bilateral symmetry. Here, the snowflake grid structure has the attributes of high inclusiveness and strong adaptability: 1) inclusiveness: it has the characteristics of flexibly accepting distributed power sources, electric vehicles, energy storage, etc. The uncertainty of power generation and consumption behavior at both ends of the user supports the access, withdrawal and interaction of various market entities. Based on the above characteristics and attributes, the snowflake grid structure is specifically manifested in five characteristics: safe and reliable, cost-effective, green and low-carbon, high-quality service, and optimized interaction.

Next, based on the polygonal closed-loop power distribution ring network, the present invention can construct the distribution network frame of the above three substations to obtain the target power distribution ring network. Here, since the target power distribution ring network is connected through multiple target contact nodes, each power supply line in the substation has a reasonable segmentation and connection, which improves the load rate of the target power distribution ring network, thus The utilization rate of power supply resources is improved. At the same time, the self-healing ability of fault automatic detection, isolation, network reconfiguration and restoration of power supply of the target power distribution ring network is improved, and the adaptability to changes in load conditions in the power supply area is improved.

In order to make the above-mentioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present disclosure more clearly, the following will briefly introduce the accompanying drawings used in the embodiments. The accompanying drawings here are incorporated into the specification and constitute a part of the specification. The drawings show the embodiments consistent with the present disclosure, and are used together with the description to explain the technical solutions of the present disclosure. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be regarded as limiting the scope. For those skilled in the art, they can also make From these drawings other related drawings are obtained.

FIG. 1 shows a schematic diagram of a grid structure of a single-ring network provided by an embodiment disclosed in the present invention;

Fig. 2 shows a flow chart of a method for constructing a snowflake grid structure of a three-station six-wire mode distribution network provided by an embodiment disclosed in the present invention;

Fig. 3 shows a schematic diagram of a target power distribution ring network constructed in the grid connection form provided by the disclosed embodiment of the present invention;

Fig. 4 shows the topological diagram of the grid connection form provided by the disclosed embodiment of the present invention;

Fig. 5 shows a schematic diagram of a grid-type power supply structure for multi-area connection provided by an embodiment disclosed in the present invention;

Fig. 6 shows a schematic diagram of a grid construction device for a three-station six-wire distribution network provided by an embodiment disclosed in the present invention;

Fig. 7 shows a schematic diagram of a computer device provided by a disclosed embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only It is a part of the embodiments of the present disclosure, but not all of them. The components of the disclosed embodiments generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed disclosure, but merely represents selected embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative effort shall fall within the protection scope of the present disclosure.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

The term "and/or" in this article only describes an association relationship, which means that there can be three kinds of relationships, for example, A and/or B can mean: there is A alone, A and B exist at the same time, and B exists alone. situation. In addition, the term "at least one" herein means any one of a variety or any combination of at least two of the more, for example, including at least one of A, B, and C, which may mean including from A, Any one or more elements selected from the set formed by B and C.

After research, it is found that in the existing power supply methods, users in the power supply area are often supplied with power through substations. For power supply areas with certain power supply reliability requirements, ring network power distribution is often used to provide power Power supply and distribution are carried out in the power supply area, for example, single-ring network power distribution (also called single-ring network).

Here, as shown in Figure 1, it is a schematic diagram of the grid structure of the single ring network, wherein, the single ring network includes a plurality of ring network cabinets, it should be understood that the ring network cabinets are used to supply power to users in the power supply area A power distribution device for power distribution, which includes a load switch or a circuit breaker for shutting off the power supply line of the substation. The "N-1 inspection principle" is often adopted when power supply is based on the single ring network, so as to ensure that the load in the single ring network can be smoothly transferred when a fault occurs in the single ring network. However, the load rate of the single ring network often can only reach 50%, resulting in a low utilization rate of power supply resources, and, due to the change of users in the power supply area, the load situation will also change, so the single ring network is often Unreasonable segmentation of grid structure, complex connection, invalid connection, etc., cannot adapt well to changes in load conditions.

Based on the above research, the present invention discloses a method and device for constructing a snowflake grid structure of a three-station six-wire distribution network. In the embodiment of the present disclosure, the grid structure of the distribution network can be constructed based on the preset three substations, and the three substations are connected through the target contact node to obtain a polygonal snowflake-style closed-loop power distribution ring network. Next, based on the polygonal closed-loop power distribution ring network, the distribution network structure of the above three substations can be constructed to obtain the target power distribution ring network. Here, since the target power distribution ring network is connected through multiple target contact nodes, each power supply line in the substation has a reasonable segmentation and connection, which improves the load rate of the target power distribution ring network, thus The utilization rate of power supply resources is improved. At the same time, the self-healing ability of fault automatic detection, isolation, network reconfiguration and restoration of power supply of the target power distribution ring network is improved, and the adaptability to changes in load conditions in the power supply area is improved.

In order to facilitate the understanding of this embodiment, first, a method for constructing a snowflake grid structure of a three-station and six-wire distribution network disclosed in the embodiment of the disclosure is introduced in detail. The three-station and six-wire distribution network provided by the embodiment of the disclosure The execution subject of the network frame construction method of the power grid is generally a computer device with a certain computing power. In some possible implementation manners, the grid construction method of the three-station six-wire distribution network can be realized by calling a computer-readable instruction stored in a memory by a processor.

Referring to FIG. 2 , it is a flow chart of a snowflake grid construction method for a three-station six-wire distribution network provided by an embodiment of the present disclosure. The method includes steps S101 to S105:

S101: Determine target contact nodes matching the preset three substations; wherein, each of the substations corresponds to two power supply lines.

In the embodiment of the present disclosure, the above-mentioned substation may be a substation for supplying power to a power supply area. For example, the power supply area may be an urban area, and the power supply area includes multiple users, that is, the following target load objects. Here, each substation corresponds to two power supply lines, and the power supply lines are used to supply power to users in the power supply area. The type of the power supply line can be determined based on the specifications of the above-mentioned substation. For example, if the specification of the substation is a medium-voltage substation (that is, a 35KV substation or a 110KV substation), then the type of the power supply line can be a 10kV cable line.

After the above three preset substations are determined, matching target contact nodes can be determined for the determined three substations, and the target contact nodes can include power distribution devices and ring network units that match the models of the above power supply lines And the distribution station, among them, the ring network node can adopt the ring main unit, box-type substation, power distribution room, etc. It should be understood that users in the power supply area can access the target power distribution ring network composed of these three substations through the target contact node.

In the embodiment of the present disclosure, the above-mentioned target contact nodes may include intra-station contact nodes and inter-station contact nodes, wherein the inter-station contact nodes may be used to connect the above three substations together to form a closed-loop network, and the intra-station contact nodes may connect each The two power supply lines of a substation are connected together. The specific contact methods are as follows, and will not be repeated here.

S103: Connect the power supply lines of the three substations based on the target contact node to obtain grid connection forms corresponding to the three substations; wherein the grid connection form is a polygonal closed-loop power distribution ring network.

In the embodiment of the present disclosure, in addition to the above-mentioned target contact node, the above-mentioned substation may also include an ordinary contact node, wherein the ordinary contact node is serially connected in the power supply line of the substation, and similarly, users in the power supply area can also pass The common contact node is connected to the target power distribution ring network composed of these three substations. It should be understood that, when determining the above grid connection form, the common contact node is connected in series on one edge of the polygonal closed-loop power distribution ring network superior.

S105: Construct the distribution grid of the three substations based on the grid connection form to obtain a target power distribution ring network, so as to supply power to target load objects through the target power distribution ring network.

In the embodiment of the present disclosure, after the target power distribution ring network obtained after constructing the distribution network framework of the above three substations based on the above-mentioned polygonal closed-loop power distribution ring network, the target contact node in the target power distribution ring network Both can be regarded as being powered by any two power supply lines.

，其中，N≥6。也即该目标配电环网的负载率可以达到83%及以上，相比较单环网的50%负载率以及双环网的75%负载率而言，本公开提高了供电资源的利用率。Based on this, after a target contact node fails, the faulty line corresponding to the target contact node can be cut off, and the load borne by the faulty line can be transferred through the power supply lines corresponding to other target contact nodes, thereby Satisfy the "N-1 inspection principle", therefore, the load rate of the target distribution ring network is:

, where N≥6. That is to say, the load rate of the target power distribution ring network can reach 83% or above. Compared with the 50% load rate of the single ring network and the 75% load rate of the double ring network, the disclosure improves the utilization rate of power supply resources.

At the same time, since the above-mentioned target power distribution ring network is a polygonal closed-loop power distribution ring network, each power supply line in the substation has a reasonable segmentation and connection, and each side of the target power distribution ring network can be used to power supply areas. The target load object in the network (that is, the above-mentioned users) supplies power, which improves the self-healing capabilities of automatic fault detection, isolation, network reconfiguration, and power restoration of the target distribution ring network, and improves the ability to respond to changes in load conditions in the power supply area. adaptability.

In an optional implementation manner, the target contact nodes include inter-station contact nodes and intra-station contact nodes. In the above step S101, determining the target contact nodes matching the three substations specifically includes the following process:

S1011: Determine an in-station contact node for each substation; wherein, the in-station contact node is a node for contacting two power supply lines corresponding to the substation;

S1012: Determine an inter-station contact node for contacting each of the substations, and obtain an inter-station contact node;

S1013: Determine the target contact node based on the at least one intra-site contact node and the at least one inter-site contact node.

In the embodiment of the present disclosure, in the process of determining the in-station contact node for each substation, the access mode of the in-station contact node to the power supply line of the substation can be determined first, specifically, the in-station contact node can be a flexible multi-state A switch, the flexible multi-state switch is respectively connected in series with two power supply lines of the substation.

In the process of determining the inter-station contact node used to contact each substation, the inter-station contact node can connect each power supply line of the substation with a power supply line of other substations, so the target contact node can be understood as the The above three substations are connected in series.

In the embodiment of the present disclosure, the above-mentioned target contact nodes include inter-station contact nodes and intra-station contact nodes, so as to realize the connection between the above three substations to form an independent ring-mesh feeder cluster and build a stronger and easier Expanded and gridded energy configuration platform.

In an optional embodiment, the target contact node includes an inter-station contact node and an intra-station contact node. In the above step S103, the power supply lines of the three substations are connected based on the target contact node, and the three substations are obtained. The grid connection form corresponding to each substation includes the following process:

S11: Based on the in-station contact node, perform in-station contact for each of the substations to obtain first contact information;

S12: Based on the inter-station contact node, perform inter-station contact for each of the substations to obtain second contact information; wherein, the second contact information is used to indicate that the power supply line corresponding to each substation communicates with the other two substations connection;

S13: Based on the first contact information and the second contact information, determine grid connection forms corresponding to the three substations.

In the embodiment of the present disclosure, as shown in FIG. 3 , the target power distribution ring network constructed based on the above-mentioned grid connection form, wherein the first contact information includes the following contact information: the contact node A in the station is used to contact the substation A The power supply line "outgoing line a and outgoing line b", the contact node B in the station is used to contact the two power supply lines "outgoing line c and outgoing line d" of substation B, and the contact node C in the station is used to contact the two power supply lines "outgoing line e and Outline f".

In addition, the second contact information includes the following contact information: the inter-station contact node D is used to contact the power supply line "outgoing line a" of substation A and the power supply line "outgoing line c" of substation B, and the inter-station contact node E is used to contact substation A The power supply line "outgoing line b" of substation C and the power supply line "outgoing line e" of substation C, the inter-station contact node F is used to connect the power supply line "outgoing line d" of substation B and the power supply line "outgoing line f" of substation C.

In the process of determining the grid connection forms corresponding to the above three substations based on the first contact information and the second contact information, the above-mentioned inter-station contact nodes and intra-station contact nodes can be connected in series. Specifically, the above-mentioned inter-station contact nodes The substations can be connected based on the above-mentioned intra-station connection nodes. For example, inter-station contact node D can communicate with substation A and substation B based on intra-station contact node A and intra-station contact node B, and inter-station contact node E can communicate with substation A and substation C based on intra-station contact node A and intra-station contact node C For communication, the inter-station contact node F can communicate with the substation B and the substation C based on the intra-station contact node B and the intra-station contact node C.

In the embodiment of the present disclosure, the above-mentioned target contact nodes include inter-station contact nodes and intra-station contact nodes, and the above-mentioned three substations can be connected based on the inter-station contact nodes and intra-station contact nodes, so that the determined grid connection form The segmentation is more reasonable.

In an optional implementation manner, the above step S103, based on the target contact node, connects the power supply lines of the three substations to obtain the grid connection form corresponding to the three substations, which specifically includes the following process:

S21: Determine the target contact node as a polygon vertex;

S22: Construct the polygonal closed-loop power distribution ring network according to the polygonal vertices.

In the embodiment of the present disclosure, as shown in FIG. 4, it is a topological diagram of the above-mentioned grid connection form, wherein, the target contact nodes corresponding to the above three substations include three inter-station contact nodes (the inter-station contact nodes are the inter-station contact nodes in FIG. 4 In the case of solid nodes) and three in-station contact nodes (the in-station contact nodes are hollow nodes in Figure 4), the determined polygonal vertices are 6. Therefore, the closed-loop power distribution ring network constructed based on the polygonal vertices is six At the same time, because the area enclosed by the power supply line is shaped like a snowflake petal, the hexagonal power distribution ring network can also be called a snowflake grid structure.

In the above-mentioned snowflake grid structure, when the power supply line corresponding to any snowflake edge is determined to be a faulty line, the load on the faulty line can be transferred through the power supply lines corresponding to other snowflake edges to meet the " N-1 test principle", therefore, the load rate of the target distribution ring network constructed based on the snowflake grid structure is 83%.

In the embodiment of the present disclosure, the target power distribution ring network constructed based on the above-mentioned snowflake grid structure satisfies the "N-1 test principle", and the load rate of the target power distribution ring network can reach 83%, thus achieving a higher power resource utilization. At the same time, the topological structure is concise and clear, the grid structure is flexible and reliable, and it supports large-scale load transfer, which lays a solid foundation for the function of the grid structure. The concept extends the snowflake shape's characteristics of both rotational symmetry and bilateral symmetry. Here, the snowflake grid structure has the attributes of high inclusiveness and strong adaptability: 1) inclusiveness: it has the characteristics of flexibly accepting distributed power sources, electric vehicles, energy storage, etc. The uncertainty of power generation and consumption behavior at both ends of the user supports the access, withdrawal and interaction of various market entities. Based on the above characteristics and attributes, the snowflake grid structure is specifically manifested in five characteristics: safe and reliable, cost-effective, green and low-carbon, high-quality service, and optimized interaction.

In an optional embodiment, the target load object includes a multi-power source load object, wherein the multi-power source load object corresponds to multiple substations. In the above step S105, power is supplied to the target load object through the target power distribution ring network, Specifically include the following processes:

S1051: Determine multiple substations corresponding to the multiple power source load objects;

S1052: Connect the multiple power supply load objects in series to the power supply lines of the multiple substations, and determine any substation in the multiple substations as a target substation, so that the target substation passes through the target power distribution The ring network supplies power to the multi-power load object.

In the embodiment of the present disclosure, considering that there may be multiple power source load objects in the power supply area corresponding to the target power distribution ring network, the present disclosure also provides a solution for supplying power to the multiple power source load objects. Here, The multi-power supply load object has high requirements on power supply demand and power supply stability.

Specifically, if the above-mentioned multi-power source load object is a distribution substation, firstly, the number of substations corresponding to the distribution substation can be determined based on the number of main transformers contained in the distribution room. For example, the distribution substation contains two The main transformer, then, the number of substations corresponding to the distribution substation can be two. The power supply lines are connected, supply power through any two power supply lines, and determine the remaining two power supply lines as backup power supply lines.

For example, the distribution substation can be connected in series to the inter-station contact node D and the inter-station contact node E, supply power through the above-mentioned power supply lines "line a" and "line b", and connect "line c" and "line e" is determined as the backup power supply line.

In the embodiment of the present disclosure, for a multi-power source load object, the multi-power source load object can be serially connected to multiple inter-station contact nodes to meet the requirements of the multi-power source load object for power supply demand, and improve the Power supply stability.

In an optional embodiment, when the number of the target power distribution ring network is multiple, the target power distribution ring network includes the first power distribution ring network and the second power distribution ring network, as shown in the above-mentioned Figure 2 The corresponding implementation mode also includes the following process:

S1051: Determine a first target contact node among the target contact nodes of the first power distribution ring network, and determine a second target contact node among the target contact nodes of the second power distribution ring network;

S1052: Based on the first target contact node and the second target contact node, communicate the first power distribution ring network and the second power distribution ring network to obtain a communication channel.

In the embodiment of the present disclosure, considering the relatively dense load in the power supply area and the change of the power supply area, only three substations cannot meet the power supply demand and regional development requirements. Therefore, the present disclosure also provides a multi-area communication network A grid-like power supply structure in which multiple regions are connected, each of the above-mentioned snowflake-like grid structures is a power supply unit.

As shown in Figure 5, it is a schematic diagram of the above-mentioned multi-area grid power supply structure. The grid power supply structure includes two power supply units, that is, the first power distribution ring network and the second power distribution ring network, wherein the first power distribution ring network The electric ring network is used to supply power to the power supply area 1, and the second power distribution ring network is used to supply power to the power supply area 2.

In the process of connecting the first power distribution ring network and the second power distribution ring network, the inter-station contact nodes in the first power distribution ring network and the second power distribution ring network can be connected through the communication channel , wherein, the model of the line used in the communication channel may be the same as that of the above-mentioned power supply line.

It should be understood that in actual grid planning, multiple snowflake grid structures can be connected together, so that power resource support and load transfer can be realized between multiple snowflake grid structures. The present disclosure does not specifically limit the number of snowflake grid structures included in the grid grid power supply structure for multi-area connection.

In the embodiment of the present disclosure, the first power distribution ring network and the second power distribution ring network can be connected through the communication channel, so as to strengthen the communication between multiple power supply areas.

In an optional implementation manner, the implementation manner corresponding to the above steps S1071-S1072 also includes the following process:

(1) When a load transfer request of the first power distribution ring network is detected, determine whether the second power distribution ring network meets the load transfer requirement;

(2) When the second power distribution ring network meets the load transfer requirements, send a load transfer instruction to the second power distribution ring network so that the second power distribution ring network passes through the communication channel Supplying power to the target load object corresponding to the first power distribution ring network.

In the embodiment of the present disclosure, the load transfer between multiple power distribution ring networks can be realized based on the above communication channels, thereby strengthening the communication between multiple power supply areas, and further enhancing the power supply reliability and adaptability of the entire grid power supply structure. sex.

Specifically, taking the above-mentioned Figure 5 as an example, the power supply area 1 and the power supply area 2 are urban areas in city A respectively, and the first power distribution ring network is determined based on the above-mentioned power supply area 1, so as to provide users in the power supply area 1 supply power, and determine the second power distribution ring network based on the above power supply area 2, so as to supply power to users in the power supply area 2.

However, as the planning of city A changed, the original power supply area 1 was designated as an industrial area, so that the users in the original power supply area 2 moved to the original power supply area 1, resulting in the current power supply area 2. The load decreases, and the load in the power supply area 1 increases. At this time, the power supply of the first power distribution ring network is insufficient, and the power supply of the second power distribution ring network is redundant.

Based on this, the first power distribution ring network can send a load transfer request to the second power distribution ring network, and if it is determined that the second power distribution ring network can provide enough power supply for the first power distribution ring network, the second The second power distribution ring network meets the load transfer requirements, and instructs the second power distribution ring network to supply power to the target load objects that need to be powered in the first power distribution ring network through the communication channel through the load transfer instruction.

In the embodiment of the present disclosure, when the above-mentioned load transfer requirement is detected, the load transfer and support between multiple target power distribution ring networks can be realized through the communication channel, thereby adapting to the change of load in urban planning with user migration , reducing the cost of grid planning and grid construction.

In an optional implementation manner, the above step S105, providing power to the target load object through the target power distribution ring network, specifically includes the following process:

S31: Determine a target current corresponding to the target load object, where the target current includes a DC current or an AC current;

S32: When the target current does not match the current provided by the target power distribution ring network, adjust the current provided by the target power distribution ring network to the target current, and supply the target current to the Describe the target load object.

In the embodiment of the present disclosure, as shown in FIG. 3 , the target contact node and the common contact node in the target power distribution ring network may include flexible multi-state switches, and when the target load object is powered by the target power distribution ring network In the process, the current provided by the target distribution network can be AC current. When the target current required by the target load object is DC current, the AC current can be converted into DC current through the flexible multi-state switch and directly supplied to target load objects without the need for a converter to convert AC current.

At the same time, the above-mentioned flexible multi-state switch can also realize the power flow control in the target distribution network. Due to the rapid development of distributed power supply, micro-grid and power electronics technology and the operation of the access system, the function of the power distribution system is no longer limited to the distribution of electric energy. Instead of distribution, it integrates various roles such as production, conversion, storage and transaction of electric energy, so it puts forward higher requirements for the controllability of the power flow and the flexibility of the network structure. At the same time, a large number of distributed power sources and power computer equipment are connected to the distribution network, which changes the form of the distribution network from a traditional radial network to a complex network with distributed power sources as the core, resulting in more diverse operating states of the distribution network, thus affecting The adjustment capability and operational flexibility of distribution network power transmission put forward higher requirements. At present, due to various reasons such as control and protection, the distribution network can only adopt closed-loop design and open-loop operation, which has greatly reduced the flexibility of the distribution system operation and seriously restricted the power supply reliability of the system. However, the existing distribution network tie switch can only realize simple breaking, and cannot provide effective flexible adjustment means for power flow control, voltage regulation, operation optimization, etc. These factors have become an important bottleneck restricting the development of distribution network.

In the embodiment of the present disclosure, since the flexible multi-state switch can accurately control the active power and reactive power of the feeders on both sides of the connection, and the device itself based on power electronic technology has real-time power regulation, and the switching action is not affected by With the characteristics of limit and continuous control, the flexible multi-state switch can realize flexible control of power flow regulation and reduce the problem of distribution network voltage exceeding the limit, thereby improving the economy and reliability of distribution network operation and the ability to accommodate distributed power sources.

In addition, due to the continuous improvement of the penetration rate of distributed energy, the problems of power flow optimization and voltage control of the power distribution system have become more prominent, especially the access of intermittent power sources such as wind turbines and photovoltaics, which often leads to large fluctuations in feeder power and voltage fluctuations Problems such as exceeding the limit will lead to a series of problems such as increased system operating loss, reduced operating economy, reduced distributed energy consumption level, and increased system operating risk. cause huge economic losses.

The adjustment method of the traditional distribution network mainly relies on network reconstruction. Considering factors such as switching loss and inrush current, it is impossible for the contact switch to be disconnected frequently. It is difficult for the traditional network reconstruction to achieve real-time adjustment of the distribution system, flexible multi-state The switch has attracted widespread attention due to its powerful real-time power control capability. Applying it to the field of power distribution system operation control will effectively make up for the serious shortage of primary control methods in the power distribution system, and will also significantly improve the operating status of the entire power distribution system. .

To sum up, in the embodiment of the present disclosure, the grid structure of the distribution network can be constructed based on the preset three substations, and the three substations can be connected through the target contact node to obtain a polygonal closed-loop power distribution ring network. Next, based on the polygonal closed-loop power distribution ring network, the distribution network frame of the above three substations can be constructed to obtain the target power distribution ring network. Here, since the target power distribution ring network is connected through multiple target contact nodes, each power supply line in the substation has a reasonable segmentation and connection, which improves the load rate of the target power distribution ring network, thus The utilization rate of power supply resources is improved. At the same time, the self-healing ability of fault automatic detection, isolation, network reconfiguration and restoration of power supply of the target power distribution ring network is improved, and the adaptability to changes in load conditions in the power supply area is improved.

Those skilled in the art can understand that in the above method of specific implementation, the writing order of each step does not mean a strict execution order and constitutes any limitation on the implementation process. The specific execution order of each step should be based on its function and possible The inner logic is OK.

Based on the same inventive concept, embodiments of the present disclosure also provide a grid construction device for a three-station six-wire distribution network corresponding to a grid construction method for a three-station six-wire distribution network. The principle of the device to solve the problem is similar to the grid construction method of the above-mentioned three-station six-wire distribution network in the embodiment of the present disclosure, so the implementation of the device can refer to the implementation of the method, and the repetition will not be repeated.

Referring to FIG. 6, it is a schematic diagram of a grid construction device for a three-station six-wire distribution network provided by an embodiment of the present disclosure. The device includes: a determination unit 61, a contact unit 62, and a construction unit 63; wherein,

A determining unit 61, configured to determine target contact nodes matching the preset three substations; wherein, each of the substations corresponds to two power supply lines;

The liaison unit 62 is configured to connect the power supply lines of the three substations based on the target liaison node to obtain grid connection forms corresponding to the three substations; wherein, the grid connection form is a polygonal closed-loop configuration Electric ring network;

The construction unit 63 is configured to construct the distribution grid of the three substations based on the grid connection form to obtain a target power distribution ring network, so as to supply power to target load objects through the target power distribution ring network.

In the embodiment of the present disclosure, the grid structure of the distribution network can be constructed based on the preset three substations, and the three substations are connected through the target contact node to obtain a polygonal closed-loop power distribution ring network. Next, Based on the polygonal closed-loop power distribution ring network, the distribution network frame of the above three substations can be constructed to obtain the target power distribution ring network. Here, since the target power distribution ring network is connected through multiple target contact nodes, each power supply line in the substation has a reasonable segmentation and connection, which improves the load rate of the target power distribution ring network, thus The utilization rate of power supply resources is improved. At the same time, the self-healing ability of fault automatic detection, isolation, network reconfiguration and restoration of power supply of the target power distribution ring network is improved, and the adaptability to changes in load conditions in the power supply area is improved.

In a possible implementation manner, the target contact node includes an inter-station contact node and an intra-station contact node, and the determining unit 61 is further configured to:

Determining an in-station contact node for each of the substations; wherein, the in-station contact node is a node for contacting the corresponding two-circuit power supply lines of the substation;

determining an inter-station contact node for contacting each of the substations to obtain an inter-station contact node;

The target contact node is determined based on the at least one intra-site contact node and the at least one inter-site contact node.

In a possible implementation manner, the target contact node includes an inter-station contact node and an intra-station contact node, and the contact unit 62 is further configured to:

Based on the in-station contact node, perform in-station contact for each of the substations to obtain first contact information;

Based on the inter-station contact node, perform inter-station contact for each of the substations to obtain second contact information; wherein the second contact information is used to instruct the power supply line corresponding to each substation to communicate with the other two substations;

Based on the first contact information and the second contact information, grid connection forms corresponding to the three substations are determined.

In a possible implementation manner, the contact unit 62 is also used to:

determining the target contact node as a polygon vertex;

The polygonal closed-loop power distribution ring network is constructed according to the polygonal vertices.

In a possible implementation manner, the target load object includes a multi-power source load object, wherein the multi-power source load object corresponds to multiple substations, and the construction unit 63 is further configured to:

determining a plurality of substations corresponding to the multi-power source load object;

connecting the multi-power source load objects in series in the power supply lines of the multiple substations, and determining any substation in the multiple substations as a target substation, so that the target substation passes through the target power distribution ring network Power is supplied to the multi-source load object.

In a possible implementation manner, there are multiple target power distribution ring networks, wherein the target power distribution ring network includes a first power distribution ring network and a second power distribution ring network, and the device also uses At:

determining a first target contact node among the target contact nodes of the first power distribution ring network, and determining a second target contact node among the target contact nodes of the second power distribution ring network;

Based on the first target contact node and the second target contact node, the first power distribution ring network and the second power distribution ring network are connected to obtain a communication channel.

In a possible implementation manner, the device is also used for:

If a load transfer request of the first power distribution ring network is detected, determine whether the second power distribution ring network meets the load transfer requirement;

In the case that the second power distribution ring network meets the load transfer requirement, send a load transfer instruction to the second power distribution ring network, so that the second power distribution ring network can send the second power distribution ring network to the first power distribution ring network through the communication channel. A target load object corresponding to a power distribution ring network supplies power.

In a possible implementation manner, the construction unit 63 is also used for:

determining a target current corresponding to the target load object, where the target current includes a direct current or an alternating current;

If the target current does not match the current provided by the target power distribution ring network, adjust the current provided by the target power distribution ring network to the target current, and supply the target current to the target load object.

For the description of the processing flow of each unit in the device and the interaction flow between each unit, reference may be made to the relevant description in the above method embodiment, and details will not be described here.

Corresponding to the grid construction method of the three-station six-wire distribution network in Figure 2, the embodiment of the present disclosure also provides a computer device 700, as shown in Figure 7, the structure of the computer device 700 provided by the embodiment of the present disclosure Schematic, including:

Processor 71, memory 72, and bus 73; Memory 72 is used for storing execution order, comprises memory 721 and external memory 722; Memory 721 here is also called internal memory, is used for temporarily storing the operation data in processor 71, and with The data exchanged by the external memory 722 such as hard disk, the processor 71 exchanges data with the external memory 722 through the memory 721, when the computer device 700 is running, the processor 71 communicates with the memory 72 through the bus 73, so that The processor 71 executes the following instructions:

Determining target contact nodes matching the preset three substations; wherein, each of the substations corresponds to two power supply lines;

Connect the power supply lines of the three substations based on the target contact node to obtain the grid connection form corresponding to the three substations; wherein, the grid connection form is a polygonal closed-loop power distribution ring network;

Based on the grid connection form, the distribution grid of the three substations is constructed to obtain a target power distribution ring network, so as to supply power to target load objects through the target power distribution ring network.

An embodiment of the present disclosure also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is run by a processor, the three-station six-wire mode power distribution described in the above-mentioned method embodiments is executed. The steps of the net frame construction method. Wherein, the storage medium may be a volatile or non-volatile computer-readable storage medium.

An embodiment of the present disclosure also provides a computer program product, the computer program product carries a program code, and the instructions included in the program code can be used to implement the network architecture of the three-station six-wire mode distribution network described in the above method embodiment For the steps of the construction method, refer to the above-mentioned method embodiments for details, and details are not repeated here.

Wherein, the above-mentioned computer program product may be specifically implemented by means of hardware, software or a combination thereof. In an optional embodiment, the computer program product is embodied as a computer storage medium. In another optional embodiment, the computer program product is embodied as a software product, such as a software development kit (Software Development Kit, SDK), etc. Wait.

Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the above-described system and device can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here. In the several embodiments provided in the present disclosure, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some communication interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium executable by a processor. Based on this understanding, the technical solution of the present disclosure is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in various embodiments of the present disclosure. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, and other media capable of storing program codes.

Finally, it should be noted that: the above-described embodiments are only specific implementations of the present disclosure, used to illustrate the technical solutions of the present disclosure, not to limit them, and the scope of protection of the present disclosure is not limited thereto, although referring to the aforementioned The embodiments have described the present disclosure in detail, and those skilled in the art should understand that any person familiar with the technical field can still modify the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present disclosure Changes can be easily imagined, or equivalent replacements can be made to some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and should be included in the disclosure. within the scope of protection. Therefore, the protection scope of the present disclosure should be defined by the protection scope of the claims.

Claims (9)

1. A snowflake grid type grid frame construction method of a three-station six-line mode power distribution network is characterized by comprising the following steps:

determining target contact nodes matched with three preset transformer substations; each transformer substation corresponds to two power supply lines;

the power supply lines of the three substations are contacted based on the target contact node, and grid contact forms corresponding to the three substations are obtained; wherein the net rack is in a polygonal snowflake format closed-loop power distribution ring network in an interconnection form;

constructing a power distribution network frame for the three substations based on the network frame connection form to obtain a target power distribution ring network so as to supply power to a target load object through the target power distribution ring network,

the power supply to the target load object through the target power distribution ring network includes:

determining a target current corresponding to the target load object, wherein the target current comprises direct current or alternating current;

when the target current is not matched with the current provided by the target distribution looped network, the current provided by the target distribution looped network is adjusted to be the target current, and the target current is supplied to the target load object,

the target connection node and the common connection node in the target power distribution ring network comprise the flexible multi-state switch, in the process of supplying power to the target load object through the target power distribution ring network, the current provided by the target power distribution network is alternating current, and under the condition that the target current required by the target load object is direct current, the alternating current can be converted into the direct current through the flexible multi-state switch and directly supplied to the target load object without being connected with a converter to convert the alternating current.

2. The method of claim 1, wherein the targeted contact nodes include inter-site contact nodes and intra-site contact nodes;

the determining of the target contact node matched with the three substations comprises the following steps:

determining an in-station connection node for each of the substations; the in-station connection node is used for contacting two corresponding power supply lines of the transformer substation;

determining an inter-station contact node for contacting each transformer substation to obtain the inter-station contact node;

determining the target contact node based on the in-station contact node and the inter-station contact node.

3. The method of claim 1, wherein the targeted contact nodes include inter-site contact nodes and intra-site contact nodes;

the target contact node is used for contacting the power supply lines of the three substations to obtain the grid frame contact forms corresponding to the three substations, and the method comprises the following steps:

performing in-station connection on each transformer substation based on the in-station connection nodes to obtain first contact information;

performing inter-station contact on each transformer substation based on the inter-station contact nodes to obtain second contact information; the second connection information is used for indicating the power supply line corresponding to each transformer substation to be connected with other two transformer substations;

and determining the net rack contact forms corresponding to the three substations based on the first contact information and the second contact information.

4. The method of claim 1, wherein the contacting the power supply lines of the three substations based on the target contact node to obtain the grid contact forms corresponding to the three substations, further comprises:

determining the target contact node as a polygon vertex;

and constructing the polygonal snowflake format closed-loop power distribution ring network according to the polygon vertexes.

5. The method of claim 1, wherein the target load object comprises a multiple power supply load object; the multi-power supply load object corresponds to a plurality of substations;

the supplying power to the target load object through the target power distribution ring network includes:

determining a plurality of substations corresponding to the multi-power-supply load objects;

and connecting the multiple power supply load objects in series in the power supply lines of the plurality of transformer substations, and determining any transformer substation in the plurality of transformer substations as a target transformer substation so that the target transformer substation supplies power to the multiple power supply load objects through the target power distribution ring network.

6. The method of claim 1, wherein the number of the target distribution ring networks is plural, wherein the target distribution ring networks include a first distribution ring network and a second distribution ring network;

the method further comprises the following steps:

determining a first target contact node in the target contact nodes of the first distribution ring network, and determining a second target contact node in the target contact nodes of the second distribution ring network;

and based on the first target contact node and the second target contact node, the first power distribution ring network and the second power distribution ring network are contacted to obtain a contact channel.

7. The method of claim 6, further comprising:

under the condition that the load transfer request of the first power distribution ring network is detected, determining whether the second power distribution ring network meets the load transfer requirement;

and under the condition that the second distribution ring network meets the load transfer requirement, sending a load transfer instruction to the second distribution ring network so that the second distribution ring network supplies power to a target load object corresponding to the first distribution ring network through the contact channel.

8. The utility model provides a snowflake form rack of six line mode distribution networks in three stations constructs device which characterized in that includes:

the determining unit is used for determining target contact nodes matched with the three preset transformer substations; each transformer substation corresponds to two power supply lines;

the contact unit is used for contacting the power supply circuits of the three substations based on the target contact node to obtain the network frame contact forms corresponding to the three substations; wherein the net rack is connected with a closed-loop power distribution ring network in a polygonal shape;

a construction unit for constructing the network frame of the power distribution network for the three substations based on the network frame contact form to obtain a target power distribution ring network so as to supply power to a target load object through the target power distribution ring network,

the power supply to the target load object through the target power distribution ring network includes:

determining a target current corresponding to the target load object, wherein the target current comprises a direct current or an alternating current;

when the target current is not matched with the current provided by the target distribution looped network, the current provided by the target distribution looped network is adjusted to be the target current, and the target current is supplied to the target load object,

the target connection node and the common connection node in the target power distribution ring network comprise the flexible multi-state switch, in the process of supplying power to the target load object through the target power distribution ring network, the current provided by the target power distribution network is alternating current, and under the condition that the target current required by the target load object is direct current, the alternating current can be converted into the direct current through the flexible multi-state switch and directly supplied to the target load object without being connected with a converter to convert the alternating current.

9. A computer device, comprising: processor, memory and bus, the memory storing machine readable instructions executable by the processor, the processor and the memory communicating via the bus when a computer device is running, the machine readable instructions when executed by the processor performing the steps of the grid construction method of the power distribution network according to any one of claims 1 to 8.

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