CN115189355B

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

Info

Publication number: CN115189355B
Application number: CN202211093334.9A
Authority: CN
Inventors: 王哲; 王伟臣; 段佳莉; 迟福建; 赵长伟; 施晓辰; 罗凤章; 高宇江; 张章; 李桂鑫; 孙阔; 朱林伟
Original assignee: State Grid Corp of China SGCC; State Grid Tianjin Electric Power Co Ltd; Chengnan Power Supply Co of State Grid Tianjin Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; State Grid Tianjin Electric Power Co Ltd; Chengnan Power Supply Co of State Grid Tianjin Electric Power Co Ltd
Priority date: 2022-09-08
Filing date: 2022-09-08
Publication date: 2022-12-13
Anticipated expiration: 2042-09-08
Also published as: CN115189355A

Abstract

The invention discloses a snowflake grid type network frame construction method and a snowflake grid type network frame construction device for a three-station six-line mode power distribution network, wherein the method comprises 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; and constructing a power distribution network frame of 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.

Description

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

Technical Field

The invention relates to the technical field of power distribution, in particular to a snowflake grid type grid construction method and a snowflake grid type grid construction device for a three-station six-line mode power distribution network.

Background

In the existing power supply mode, users in a power supply area are often supplied with power through a substation, and for a power supply area with a certain power supply reliability requirement, a ring network power distribution mode is often adopted to supply and distribute power to the power supply area, for example, single ring network power distribution (also called single ring network).

Here, as shown in fig. 1, a schematic grid structure of the single ring network is shown, wherein the single ring network includes a plurality of ring main units, it should be understood that the ring main units are power distribution devices for distributing power to users in a power supply area, and the power distribution devices include load switches or circuit breakers for disconnecting a substation power supply line. When power is supplied based on the single-ring network, an N-1 inspection principle is often adopted 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 can only reach 50%, which leads to a low utilization rate of power supply resources, and because the load condition changes due to the change of users in the power supply area, the single-ring network often has the situations of unreasonable grid structure segmentation, complex contact, invalid contact and the like, and cannot adapt to the change of the load condition well.

Disclosure of Invention

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

In a first aspect, the invention provides a snowflake-shaped grid structure construction method for a three-station six-wire mode power distribution network, which specifically comprises 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; the net rack is in a polygonal closed-loop power distribution ring network in a connection mode;

and constructing a power distribution network frame of 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 target contact nodes comprise inter-station contact nodes and intra-station contact nodes; the determining of the target contact node matched with the three transformer 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.

The target contact nodes comprise inter-station contact nodes and intra-station contact nodes, so that the contact among the three substations is realized, an independent ring network-shaped feeder line cluster is formed, and a stronger, easily-expanded and gridded energy configuration platform is built.

The target contact nodes comprise inter-station contact nodes and intra-station contact nodes; the target contact node is used for contacting the power supply lines of the three substations to obtain the network 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.

Above-mentioned target contact node includes contact node and the interior contact node of station between this station, can contact above-mentioned three transformer substations based on contact node and the interior contact node of station between this station to the segmentation of the rack contact form that makes the determination is more reasonable.

The power supply line of the three transformer substations is contacted based on the target contact node to obtain the network frame contact form corresponding to the three transformer substations, and the method further comprises the following steps:

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.

The target power distribution ring network constructed based on the snowflake-shaped net structure meets the requirement of an N-1 inspection principle, and the load rate of the target power distribution ring network can reach 83%, so that the higher power supply resource utilization rate is achieved. Meanwhile, the topological structure is simple and clear, the net rack is flexible and reliable, the load is supported to be transferred in a large range, and the foundation of the function exertion of the net rack structure is compacted. The concept extends the characteristics that the snowflake shape is not only rotationally symmetrical, but also bilaterally symmetrical. Here, the snowflake lattice network structure has the properties of high inclusion and strong adaptability: 1) Inclusion: the system has the characteristics of flexibly accepting access of a distributed power supply, an electric automobile, energy storage and the like to a power grid; 2) Adaptability: the uncertainty of the power supply and the power utilization behaviors of the two ends of the user is matched, and the access, exit and interaction of various market main bodies are supported. Based on the characteristics and attributes, the snowflake-shaped net structure has five characteristics of safety, reliability, economy, high efficiency, greenness, low carbon, high service quality and optimized interaction.

The target load object comprises a multi-power load object; the multi-power supply 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-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.

Aiming at multiple power supply load objects, the requirement of the multiple power supply load objects on the power supply demand can be met in a mode of connecting the multiple power supply load objects in series on a plurality of inter-station contact nodes, and the power supply stability is improved.

The number of the target distribution ring networks is multiple, wherein the target distribution ring network comprises 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 power distribution ring network, and determining a second target contact node in the target contact nodes of the second power 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.

Can connect first distribution looped netowrk and second distribution looped netowrk through the contact passageway to strengthen the contact between a plurality of power supply regions.

The method further comprises the following steps: 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.

Under the condition that the load transfer requirement is detected, the load transfer and support among a plurality of target power distribution looped networks can be realized through the communication channel, so that the change of the load along with the user migration in urban planning is adapted, and the cost of network frame planning and network frame construction is reduced.

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;

and under the condition that the target current is not matched with the current provided by the target distribution looped network, adjusting the current provided by the target distribution looped network into the target current, and supplying the target current to the target load object.

Alternating current can be converted into direct current through the flexible multi-state switch and directly supplied to a target load object without accessing a current transformer to convert the alternating current.

In a second aspect, the present invention further provides a network frame constructing apparatus for a three-station six-wire mode power distribution network, including:

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; the net rack is in a polygonal closed-loop power distribution ring network in a connection mode;

and the construction unit is used for constructing the power distribution network frame of 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.

In a third aspect, the present invention also provides a computer device, comprising: a processor, a memory and a bus, the memory storing machine-readable instructions executable by the processor, the processor and the memory communicating via the bus when the computer device is running, the machine-readable instructions when executed by the processor performing the steps of the first aspect described above, or any possible implementation of the first aspect.

In a fourth aspect, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the steps of the first aspect or any one of the possible implementation manners of the first aspect.

The invention has the advantages and positive effects that:

the invention provides a snowflake grid type grid construction method and a snowflake grid type grid construction device for a three-station six-wire mode power distribution network. The net rack construction of the power distribution network can be carried out based on three preset transformer substations, the three transformer substations are contacted through the target contact node, the polygonal snowflake format closed-loop power distribution ring network is obtained, the target power distribution ring network constructed based on the snowflake format net structure meets the requirement of an N-1 inspection principle, the load rate of the target power distribution ring network can reach 83%, and therefore the high power supply resource utilization rate is achieved.

Meanwhile, the power distribution network frame has a simple and clear topological structure, the network frame is flexible and reliable, the load is supported to be transferred in a large range, and the foundation of the function exertion of the network frame structure is compacted. The concept extends the characteristics that the snowflake shape is not only rotationally symmetrical, but also bilaterally symmetrical. Here, the snowflake lattice network structure has the properties of high inclusion and strong adaptability: 1) Inclusion: the system has the characteristics of flexibly accepting access of a distributed power supply, an electric automobile, energy storage and the like to a power grid; 2) Adaptability: the uncertainty of the power supply and the power utilization behaviors of the two ends of the user is matched, and the access, exit and interaction of various market main bodies are supported. Based on the characteristics and attributes, the snowflake-shaped net structure has five characteristics of safety, reliability, economy, high efficiency, greenness, low carbon, high service quality and optimized interaction.

Then, the invention can construct the power distribution network frame of the three substations based on the polygonal closed-loop power distribution ring network to obtain a target power distribution ring network. Here, because this target distribution looped netowrk is for contacting through a plurality of target contact nodes for every power supply line of transformer substation has all possessed reasonable segmentation and contact, has improved the load factor of this target distribution looped netowrk, thereby has improved the utilization ratio of power supply resource. Meanwhile, the self-healing capabilities of fault automatic detection, isolation, network reconstruction and power restoration of the target power distribution ring network are improved, and the adaptability to load condition changes in a power supply area is improved.

In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required in the embodiments will be briefly described below, and the drawings herein incorporated in and forming a part of the specification illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the technical solutions of the present disclosure. It is to be understood that the following drawings depict only certain embodiments of the disclosure and are therefore not to be considered limiting of its scope, for those skilled in the art to which the disclosure pertains without the benefit of the inventive faculty, and that additional related drawings may be derived therefrom.

Fig. 1 is a schematic diagram illustrating a rack structure of a single ring network according to an embodiment of the present disclosure;

fig. 2 is a flowchart illustrating a snowflake-shaped grid structure constructing method for a three-station six-wire mode power distribution network according to an embodiment of the disclosure;

fig. 3 is a schematic diagram of a target power distribution ring network constructed by the network rack communication form provided by the disclosed embodiment of the invention;

FIG. 4 is a topology diagram illustrating the connectivity of racks provided by the disclosed embodiment of the invention;

FIG. 5 is a schematic diagram of a grid-type power supply structure for multi-zone communication provided by the disclosed embodiments;

fig. 6 is a schematic diagram illustrating a network frame construction apparatus for a three-station six-wire mode power distribution network according to an embodiment of the disclosure;

FIG. 7 is a schematic diagram of a computer device provided by the disclosed embodiments of the invention.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions in the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, not all of the embodiments. The components of the embodiments of the present disclosure, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the disclosure, provided in the accompanying drawings, is not intended to limit the scope of the disclosure, as claimed, but is merely representative of selected embodiments of the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the disclosure without making creative efforts, shall fall within the protection scope of the disclosure.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

The term "and/or" herein merely describes an associative relationship, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" herein means any one of a variety or any combination of at least two of a variety, for example, including at least one of A, B, C, and may mean including any one or more elements selected from the group consisting of A, B and C.

Research shows that in the existing power supply mode, users in a power supply area are often supplied with power through a substation, and for the power supply area with certain power supply reliability requirements, a looped network power distribution mode is often adopted to supply and distribute power to the power supply area, for example, single looped network power distribution (also called single looped network).

Based on the research, the invention discloses a snowflake-shaped grid construction method and a snowflake-shaped grid construction device for a three-station six-line mode power distribution network. In the embodiment of the disclosure, the network frame of the power distribution network can be constructed based on three preset transformer substations, the three transformer substations are contacted through the target contact node, a polygonal snowflake-shaped closed-loop power distribution ring network is obtained, and then the network frame of the power distribution network can be constructed based on the polygonal closed-loop power distribution ring network to the three transformer substations to obtain the target power distribution ring network. Here, because this target distribution looped netowrk is for contacting through a plurality of target contact nodes for every power supply line of transformer substation has all possessed reasonable segmentation and contact, has improved the load factor of this target distribution looped netowrk, thereby has improved the utilization ratio of power supply resource. Meanwhile, the self-healing capabilities of fault automatic detection, isolation, network reconstruction and power restoration of the target power distribution ring network are improved, and the adaptability to load condition changes in a power supply area is improved.

For the convenience of understanding of the present embodiment, first, a snowflake-grid-type grid structure constructing method for a three-station six-wire-pattern power distribution network disclosed in the embodiments of the present disclosure is described in detail, and an execution main body of the grid structure constructing method for the three-station six-wire-pattern power distribution network provided in the embodiments of the present disclosure is generally a computer device with certain computing capability. In some possible implementations, the method for constructing the network frame of the three-station six-wire mode power distribution network can be implemented by a processor calling computer readable instructions stored in a memory.

Referring to fig. 2, a flowchart of a snowflake-shaped grid structure construction method for a three-station six-wire mode power distribution network provided by the embodiment of the present disclosure is shown, where the method includes steps S101 to S105:

s101: determining target contact nodes matched with three preset transformer substations; and each transformer substation corresponds to two power supply lines.

In the embodiment of the present disclosure, the 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 a plurality of users, that is, target load objects described below. Here, each substation corresponds to two circuits of power supply lines for supplying power to users in the power supply area. The model of the power supply line may be determined based on the specification of the substation, for example, if the specification of the substation is a medium voltage substation (i.e., a 35KV substation or a 110KV substation), the model of the power supply line may be 10KV cable lines.

After determining the three preset transformer substations, the matched target contact node can be determined for the three determined transformer substations, the target contact node can comprise a power distribution device, a ring network unit and a power distribution station which are matched with the model of the power supply line, and the ring network node can adopt a ring main unit, a box type transformer substation, a power distribution room and the like. It should be understood that users in the power supply area can access the target distribution ring network consisting of the three substations through the target contact node.

In this disclosure, the target contact node may include an intra-station contact node and an inter-station contact node, where the inter-station contact node may be configured to contact the three substations together to form a closed-loop ring network, and the intra-station contact node may contact two power supply lines of each substation together, where a specific contact manner is as described below and is not described herein again.

S103: 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 connection form is a polygonal closed-loop power distribution ring network.

In the embodiment of the present disclosure, in addition to the target contact node, the substation may further include a common contact node, where the common contact node is connected in series in a power supply line of the substation, and similarly, a user in a power supply area may also access a target power distribution ring network formed by the three substations through the common contact node.

S105: and constructing a power distribution network frame of 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.

In the embodiment of the present disclosure, after the target distribution ring network is obtained after the three substations are subjected to the construction of the distribution network frame based on the polygonal closed-loop distribution ring network, the target contact node in the target distribution ring network can be regarded as being supplied with power by any two power supply lines.

Based on this, after a certain target contact node breaks down, the fault line corresponding to the target contact node can be cut off, and the load borne by the fault line is transferred through the power supply lines corresponding to other target contact nodes, so that the 'N-1 inspection principle' is met, and therefore, the load rate of the target power distribution ring network is as follows:

wherein N is more than or equal to 6. That is, the load factor of the target power distribution ring network can reach 83% or more, and compared with the 50% load factor of a single ring network and the 75% load factor of a double ring network, the utilization rate of power supply resources is improved.

Meanwhile, as the target power distribution ring network is a polygonal closed-loop power distribution ring network, each power supply line of the transformer substation has reasonable segmentation and connection, and a target load object (namely the user) in a power supply area can be supplied with power through each edge of the target power distribution ring network, so that the self-healing capabilities of fault automatic detection, isolation, network reconstruction and power restoration of the target power distribution ring network are improved, and the adaptability to load condition change in the power supply area is improved.

In an optional implementation manner, the target contact nodes include inter-station contact nodes and intra-station contact nodes, and the step S101 of determining the target contact node matched with the three substations specifically includes the following processes:

s1011: 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;

s1012: determining an inter-station contact node for contacting each transformer substation to obtain the inter-station contact node;

s1013: determining the targeted contact node based on the at least one intra-station contact node and the at least one inter-station contact node.

In the embodiment of the present disclosure, in the process of determining the in-station connection node for each substation, an access manner in which the in-station connection node is accessed to a power supply line of the substation may be first determined, and specifically, the in-station connection node may be a flexible multi-state switch, and 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 nodes for contacting the transformer substations, each power supply line of the transformer substation can be contacted with one power supply line of other transformer substations by the inter-station contact nodes, and therefore the target contact node can be understood as connecting the three transformer substations in series.

In the embodiment of the disclosure, the target contact nodes include inter-station contact nodes and intra-station contact nodes, so that contact between the three substations is realized, an independent ring network-shaped feeder line cluster is formed, and a stronger, easily-expandable and gridded energy configuration platform is built.

In an optional embodiment, the target contact nodes include inter-station contact nodes and intra-station contact nodes, and in step S103, the power supply lines of the three substations are contacted based on the target contact nodes to obtain grid contact forms corresponding to the three substations, which specifically includes the following processes:

s11: performing in-station connection on each transformer substation based on the in-station connection nodes to obtain first contact information;

s12: 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;

s13: and determining the net rack contact forms corresponding to the three substations based on the first contact information and the second contact information.

In the embodiment of the present disclosure, as shown in fig. 3, a target power distribution ring network constructed based on the network rack contact form is shown, where the first contact information includes the following contact information: the in-station connection node a is used for contacting two power supply lines of the transformer substation a to be led out a and B, the in-station connection node B is used for contacting two power supply lines of the transformer substation B to be led out C and d, and the in-station connection node C is used for contacting two power supply lines of the transformer substation C to be led out e and f.

Additionally, the second contact information includes the following contact information: the inter-station contact node D is used for contacting a power supply line 'outgoing line a' of the transformer substation A and a power supply line 'outgoing line C' of the transformer substation B, the inter-station contact node E is used for contacting a power supply line 'outgoing line B' of the transformer substation A and a power supply line 'outgoing line E' of the transformer substation C, and the inter-station contact node F is used for contacting a power supply line 'outgoing line D' of the transformer substation B and a power supply line 'outgoing line F' of the transformer substation C.

In the process of determining the network rack contact forms corresponding to the three substations based on the first contact information and the second contact information, the inter-station contact nodes may be connected in series with the in-station contact nodes, and specifically, the inter-station contact nodes may contact the substation based on the in-station contact nodes. For example, the inter-station contact node D may contact the substation a and the substation B based on the intra-station contact node a and the intra-station contact node B, the inter-station contact node E may contact the substation a and the substation C based on the intra-station contact node a and the intra-station contact node C, and the inter-station contact node F may contact the substation B and the substation C based on the intra-station contact node B and the intra-station contact node C.

In this disclosed embodiment, above-mentioned target contact node includes contact node and the in-station contact node between the stations, can be based on contact node and the in-station contact node between the stations, contacts above-mentioned three substations to make the segmentation of the rack contact form of determining more reasonable.

In an optional embodiment, in step S103, the power supply lines of the three substations are contacted based on the target contact node to obtain the rack contact forms corresponding to the three substations, and the method specifically includes the following steps:

s21: determining the target contact node as a polygon vertex;

s22: and constructing the polygonal closed-loop power distribution ring network according to the polygonal vertexes.

In the embodiment of the present disclosure, as shown in fig. 4, a topological graph of the network frame contact form is shown, where in a case where the target contact nodes corresponding to the three substations include three inter-station contact nodes (the inter-station contact nodes are solid nodes in fig. 4) and three intra-station contact nodes (the intra-station contact nodes are hollow nodes in fig. 4), the number of determined polygon vertexes is 6, and therefore, a closed-loop power distribution ring network constructed based on the polygon vertexes is a hexagonal power distribution ring network, and meanwhile, since the shape of the power supply line surrounding area is like a snow petal shape, the hexagonal power distribution ring network may also be referred to as a snowflake network structure.

In the snowflake format net structure, under the condition that the power supply line corresponding to any one of the snow laces is determined as the fault line, the load on the fault line can be transferred through the power supply lines corresponding to other snow laces so as to meet the 'N-1 inspection principle', and therefore, the load rate of the target power distribution looped network constructed on the basis of the snowflake format net structure is 83%.

In the embodiment of the disclosure, the target power distribution ring network constructed based on the snowflake-shaped mesh structure meets the requirement of meeting the 'N-1 inspection principle', and the load rate of the target power distribution ring network can reach 83%, so that a higher power supply resource utilization rate is achieved. Meanwhile, the topological structure is simple and clear, the net rack is flexible and reliable, the load is supported to be transferred in a large range, and the foundation of the function exertion of the net rack structure is compacted. The concept extends the characteristics that the snowflake shape is not only rotationally symmetrical, but also bilaterally symmetrical. Here, the snowflake lattice network structure has the properties of high inclusion and strong adaptability: 1) Inclusion: the system has the characteristics of flexibly accepting access of a distributed power supply, an electric automobile, energy storage and the like to a power grid; 2) Adaptability is as follows: the uncertainty of the power supply and the power utilization behaviors of the two ends of the user is matched, and the access, exit and interaction of various market main bodies are supported. Based on the characteristics and attributes, the snowflake-shaped net structure has five characteristics of safety, reliability, economy, high efficiency, greenness, low carbon, high service quality and optimized interaction.

In an optional embodiment, the target load object includes multiple power supply load objects, where the multiple power supply load objects correspond to multiple substations, and in step S105, the target load object is powered through the target distribution ring network, which specifically includes the following processes:

s1051: determining a plurality of substations corresponding to the multi-power supply load objects;

s1052: 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.

In the embodiment of the disclosure, in consideration of the situation that multiple power supply load objects may occur in a power supply area corresponding to a target power distribution ring network, the disclosure further provides a scheme for supplying power to the multiple power supply load objects, where the multiple power supply load objects have high requirements on power supply demand and power supply stability.

Specifically, if the multi-power-supply load object is a distribution substation, the number of substations corresponding to the distribution substation may be determined based on the number of main transformers included in the distribution room, for example, the distribution substation includes two main transformers, the number of substations corresponding to the distribution substation may be two, and at this time, the distribution substation may be connected in series to any two interstation contact nodes so as to be connected to four power supply lines of two substations, and power is supplied through any two power supply lines, and the remaining two power supply lines are determined as standby power supply lines.

For example, the distribution station may be connected in series to the inter-station contact node D and the inter-station contact node E, and power may be supplied through the above-described power supply lines "line a" and "line b", and "line c" and "line E" may be determined as backup power supply lines.

In the embodiment of the disclosure, for multiple power supply load objects, the requirement of the multiple power supply load objects on the power supply demand can be met in a manner that the multiple power supply load objects are connected in series on the communication nodes among multiple stations, and the power supply stability is improved.

In an optional implementation manner, in a case that the number of the target distribution ring networks is multiple, the target distribution ring network includes a first distribution ring network and a second distribution ring network, and the implementation manner corresponding to fig. 2 further includes the following processes:

s1051: determining a first target contact node in the target contact nodes of the first power distribution ring network, and determining a second target contact node in the target contact nodes of the second power distribution ring network;

s1052: 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.

In the embodiment of the present disclosure, in consideration of the dense load in the power supply area and the transition of the power supply area, the power supply demand and the area development requirement cannot be satisfied only by three substations, and therefore, the present disclosure further provides a grid type power supply structure of multi-area connection, and in the grid type power supply structure of the multi-area connection, each of the above snowflake-shaped grid structures is a power supply unit.

Fig. 5 is a schematic diagram of the grid power supply structure with multi-area connection, where the grid power supply structure includes two power supply units, that is, a first power distribution ring network and a second power distribution ring network, where the first power distribution 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 carrying out contact on the first distribution ring network and the second distribution ring network, inter-station contact nodes in the first distribution ring network and the second distribution ring network can be connected through a contact channel, wherein the model of a line adopted by the contact channel can be the same as that of the power supply line.

It should be understood that, in the actual grid planning, a plurality of snowflake lattice network structures may be linked together, so that the plurality of snowflake lattice network structures can support the power resource and realize the load transfer. The number of the snowflake-shaped mesh structures included in the grid-type power supply structure connected in multiple areas is not particularly limited in the present disclosure.

In the embodiment of the disclosure, the first distribution ring network and the second distribution ring network can be communicated through the communication channel, so that the communication among a plurality of power supply areas is enhanced.

In an optional embodiment, the implementation manner corresponding to the above steps S1071 to S1072 further includes the following processes:

(1) Determining whether the second distribution ring network meets the load transfer requirement or not under the condition that the load transfer request of the first distribution ring network is detected;

(2) 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 communication channel.

In the embodiment of the disclosure, load transfer among a plurality of power distribution ring networks can be realized based on the communication channel, so that communication in a plurality of power supply areas is enhanced, and power supply reliability and adaptability of the whole grid type power supply structure are enhanced.

Specifically, taking the above fig. 5 as an example, the power supply area 1 and the power supply area 2 are urban areas in the city a, a first power distribution ring network is determined based on the power supply area 1 to supply power to the users in the power supply area 1, and a second power distribution ring network is determined based on the power supply area 2 to supply power to the users in the power supply area 2.

However, with the change of the planning of the city a, the original power supply area 1 is divided into industrial areas, so that the users in the original power supply area 2 move to the original power supply area 1, thereby causing the load in the existing power supply area 2 to decrease and the load in the power supply area 1 to increase, at this time, the power supply amount of the first power distribution ring network is insufficient, and the power supply amount of the second power distribution ring network is redundant.

Based on this, first distribution looped netowrk can send the load transfer requirement to second distribution looped netowrk, if it can provide the power supply volume that enough first distribution looped netowrk used to determine second distribution looped netowrk, just can confirm that this second distribution looped netowrk satisfies the load transfer requirement to instruct this second distribution looped netowrk through the above-mentioned contact channel to supply power to the target load object that needs the power supply in the first distribution looped netowrk.

In the embodiment of the present disclosure, under the condition that the load transfer requirement is detected, load transfer and support between multiple target power distribution ring networks can be achieved through the communication channel, so that a change of loads along with user migration in urban planning is adapted, and costs of network rack planning and network rack construction are reduced.

In an optional implementation manner, in the step S105, supplying power to the target load object through the target power distribution ring network specifically includes the following steps:

s31: determining a target current corresponding to the target load object, wherein the target current comprises direct current or alternating current;

s32: and under the condition that the target current is not matched with the current provided by the target distribution looped network, adjusting the current provided by the target distribution looped network into the target current, and supplying the target current to the target load object.

In the embodiment of the present disclosure, as shown in fig. 3, the target interconnection node and the common interconnection node in the target power distribution ring network may include a flexible multi-state switch, and in a process of supplying power to a target load object through the target power distribution ring network, a current provided by the target power distribution network may be an alternating current, and in a case that a target current required by the target load object is a direct current, the flexible multi-state switch may convert the alternating current into the direct current and directly supply the direct current to the target load object, without accessing a converter to convert the alternating current.

Meanwhile, the flexible multi-state switch can also realize the power flow control in a target power distribution network, and due to the rapid development of distributed power supplies, micro-grids and power electronic technologies and the operation of an access system, the functions of the power distribution system are not limited to the distribution of electric energy, but various roles of the production, conversion, storage, transaction and the like of the electric energy are integrated, so that higher requirements are provided for the controllability of the power flow and the flexibility of a network structure. Meanwhile, a large number of distributed power supplies and electric computer equipment are connected into the power distribution network, so that the form of the power distribution network is changed from a traditional radial network to a complex network taking the distributed power supplies as cores, the running state of the power distribution network is more diversified, and higher requirements are provided for the regulating capacity and the running flexibility of power transmission of the power distribution network. At present, due to various reasons such as control protection and the like, a power distribution network only can adopt a closed-loop design and open-loop operation mode, so that the operation flexibility of a power distribution system is greatly reduced, and the power supply reliability of the system is severely restricted. The existing power distribution network connection switch can only realize simple on-off, and cannot provide an effective flexible adjusting means for power flow control, voltage adjustment, operation optimization and the like, and the factors become important bottlenecks restricting the development of the power distribution network.

In the embodiment of the disclosure, the flexible multi-state switch can accurately control the active power and the reactive power of the feeders on two sides connected to the flexible multi-state switch, and the device realized based on the power electronic technology has the characteristics of real-time power regulation, unlimited switching action, continuous control and the like.

In addition, due to the continuous improvement of the permeability of the distributed energy, the problems of power flow optimization, voltage control and the like of a power distribution system are more prominent, particularly, the problems of large fluctuation of feeder power, out-of-limit voltage fluctuation and the like are often caused when intermittent power sources such as fans, photovoltaic power and the like are connected, and further, a series of problems of increased system operation loss, reduced operation economy, reduced distributed energy consumption level, increased system operation risk and the like are caused, even equipment failure caused by overload can cause outage under some conditions, and huge economic loss is caused.

The adjusting means of the traditional power distribution network mainly depends on network reconstruction, factors such as switching loss and impact current are considered, the interconnection switch cannot be frequently switched on and off, the traditional network reconstruction hardly achieves real-time adjustment of the power distribution system, the flexible multi-state switch is widely concerned about with powerful real-time power control capacity, the flexible multi-state switch is applied to the field of operation control of the power distribution system, the defect that one-time control means of the power distribution system is seriously insufficient can be effectively overcome, and the operation state of the whole power distribution system can be obviously improved.

In summary, in the embodiment of the present disclosure, the network frame of the power distribution network may be constructed based on three preset substations, and the three substations are contacted through the target contact node to obtain the polygonal closed-loop power distribution ring network. Here, because this target distribution looped netowrk is for contacting through a plurality of target contact nodes for every power supply line of transformer substation has all possessed reasonable segmentation and contact, has improved the load factor of this target distribution looped netowrk, thereby has improved the utilization ratio of power supply resource. Meanwhile, the self-healing capabilities of fault automatic detection, isolation, network reconstruction and power restoration of the target power distribution ring network are improved, and the adaptability to load condition changes in a power supply area is improved.

It will be understood by those skilled in the art that in the method of the present invention, the order of writing the steps does not imply a strict order of execution and any limitations on the implementation, and the specific order of execution of the steps should be determined by their function and possible inherent logic.

Based on the same inventive concept, the embodiment of the present disclosure further provides a grid construction device of a three-station six-wire mode power distribution network corresponding to the grid construction method of the three-station six-wire mode power distribution network, and as the principle of solving the problem of the device in the embodiment of the present disclosure is similar to the grid construction method of the three-station six-wire mode power distribution network in the embodiment of the present disclosure, the implementation of the device may refer to the implementation of the method, and repeated parts are not described again.

Referring to fig. 6, a schematic diagram of a network frame constructing apparatus for a three-station six-wire mode power distribution network provided in an embodiment of the present disclosure is shown, where the apparatus includes: a determination unit 61, a communication unit 62, a construction unit 63; wherein,

the determining unit 61 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 62 is configured to contact the power supply lines of the three substations based on the target contact node to obtain grid 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;

and the construction unit 63 is configured to construct a power distribution network frame 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.

In the embodiment of the disclosure, the network frame of the power distribution network can be constructed based on three preset transformer substations, the three transformer substations are contacted through the target contact node to obtain a polygonal closed-loop power distribution ring network, and then the network frame of the power distribution network can be constructed based on the polygonal closed-loop power distribution ring network for the three transformer substations to obtain the target power distribution ring network. Here, because this target distribution looped netowrk is for contacting through a plurality of target contact nodes for every power supply line of transformer substation has all possessed reasonable segmentation and contact, has improved the load factor of this target distribution looped netowrk, thereby has improved the utilization ratio of power supply resource. Meanwhile, the self-healing capability of fault automatic detection, isolation, network reconstruction and power restoration of the target power distribution ring network is improved, and the adaptability to load condition change in a power supply area is improved.

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

determining the targeted contact node based on the at least one intra-station contact node and the at least one inter-station contact node.

In one possible embodiment, the target contact nodes include an inter-station contact node and an intra-station contact node, and the contact unit 62 is further configured to:

In one possible embodiment, the contact unit 62 is further configured to:

determining the target contact node as a polygon vertex;

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

In a possible embodiment, the target load object includes multiple power supply load objects, where the multiple power supply load objects correspond to multiple substations, and the building unit 63 is further configured to:

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

In a possible embodiment, the number of the target distribution ring networks is multiple, where the target distribution ring network includes a first distribution ring network and a second distribution ring network, and the apparatus is further configured to:

In one possible embodiment, the apparatus is further configured to:

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;

In a possible embodiment, the building unit 63 is further configured to:

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

The description of the processing flow of each unit in the device and the interaction flow between each unit may refer to the related description in the above method embodiments, and will not be described in detail here.

Corresponding to the method for constructing the network frame of the three-station six-wire mode power distribution network in fig. 2, an embodiment of the present disclosure further provides a computer device 700, and as shown in fig. 7, a schematic structural diagram of the computer device 700 provided in the embodiment of the present disclosure includes:

a processor 71, a memory 72, and a bus 73; the memory 72 is used for storing execution instructions and includes a memory 721 and an external memory 722; the memory 721 is also referred to as an internal memory, and is used for temporarily storing the operation data in the processor 71 and the data exchanged with the external memory 722 such as a hard disk, the processor 71 exchanges data with the external memory 722 through the memory 721, and when the computer device 700 is operated, the processor 71 communicates with the memory 72 through the bus 73, so that the processor 71 executes the following instructions:

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 connected with a closed-loop power distribution ring network in a polygonal shape;

The embodiment of the present disclosure further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method for constructing a grid structure of a three-station six-wire mode power distribution network described in the above method embodiment are executed. The storage medium may be a volatile or non-volatile computer-readable storage medium.

The embodiments of the present disclosure also provide a computer program product, where the computer program product carries a program code, and instructions included in the program code may be used to execute the steps of the method for constructing a grid structure of a three-station six-wire mode power distribution network described in the above method embodiments, which may be referred to specifically for the above method embodiments, and are not described herein again.

The computer program product may be implemented by hardware, software or a combination thereof. In an alternative embodiment, the computer program product is embodied in a computer storage medium, and in another alternative embodiment, the computer program product is embodied in a Software product, such as a Software Development Kit (SDK), or the like.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. In the several embodiments provided in the present disclosure, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present disclosure. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

Finally, it should be noted that: the above-mentioned embodiments are merely specific embodiments of the present disclosure, which are used for illustrating the technical solutions of the present disclosure and not for limiting the same, and the scope of the present disclosure is not limited thereto, and although the present disclosure is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive of the technical solutions described in the foregoing embodiments or equivalent technical features thereof within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present disclosure, and should be construed as being included therein. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

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:

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,

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:

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:

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;

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:

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;

7. The method of claim 6, further comprising:

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 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,

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.