CN115207919A - Grid frame system suitable for rural overhead power distribution network and grid frame construction method - Google Patents
Grid frame system suitable for rural overhead power distribution network and grid frame construction method Download PDFInfo
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- CN115207919A CN115207919A CN202211093091.9A CN202211093091A CN115207919A CN 115207919 A CN115207919 A CN 115207919A CN 202211093091 A CN202211093091 A CN 202211093091A CN 115207919 A CN115207919 A CN 115207919A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
Abstract
The invention discloses a network frame system suitable for a rural overhead power distribution network and a network frame construction method, wherein the network frame system suitable for the rural overhead power distribution network comprises the following components: two substations, a plurality of target ring-off points and overhead lines; the two substations are configured to respectively determine the transmission current and respectively transmit the transmission current to the matched target ring-site through the two corresponding overhead lines; the plurality of target ring network points are configured to connect two overhead lines of each transformer substation, connect the two transformer substations to obtain a target ring network frame, and transmit the acquired transmission current to a first load object in a power supply area according to a first current type; wherein the first current type is a type of current used by the first load object; the overhead line is configured to communicate the plurality of target ring grid points and the two substations based on the target ring grid.
Description
Technical Field
The invention relates to the technical field of power distribution, in particular to a grid system suitable for a rural overhead power distribution network and a grid construction method.
Background
In the existing rural power distribution network frame, the power supply area is usually supplied with power through a single-radiation or single-ring network frame, so that the planning cost and the construction cost of the power distribution network frame are saved.
However, as shown in fig. 1, a single radiation distribution network rack is shown, where a substation a corresponds to an overhead line, and the load rate of the single radiation distribution network rack may reach 100%, but the single radiation distribution network rack does not satisfy the "N-1 inspection principle", and when a fault occurs in the single radiation distribution network rack, the load corresponding to the fault section cannot be transferred, so that the reliability of power supply is low.
As shown in fig. 2, a network frame of a single-ring network distribution network is shown, wherein a substation a and a substation B correspond to a return overhead line respectively, and although the network frame of the single-ring network distribution network satisfies an "N-1 inspection principle", when a fault occurs in the network frame of the single-ring network distribution network, the load corresponding to the fault section can be transferred through the overhead line without the fault, but because the connection of the network frame of the single-ring network distribution network is not reasonable, the load rate of the single-ring network is low, and the utilization rate of power supply resources is low.
Disclosure of Invention
The invention provides a grid system suitable for a rural overhead power distribution network and a grid construction method.
In a first aspect, the present invention provides a grid system suitable for a rural overhead power distribution network, including: two substations, a plurality of target ring-off points and overhead lines;
the two substations are configured to respectively determine the transmission current and respectively transmit the transmission current to the matched target ring-site through the two corresponding overhead lines;
the plurality of target ring network points are configured to connect two overhead lines of each transformer substation, connect the two transformer substations to obtain a target ring network frame, and transmit the acquired transmission current to a first load object in a power supply area according to a first current type; wherein the first current type is a type of current used by the first load object;
the overhead line is configured to communicate the plurality of target ring network points and the two substations based on the target ring network frame.
The plurality of target halftone dots comprising: an inter-station contact ring network point and an intra-station contact ring network point;
the in-station interconnection ring network point is configured to serially connect two loops of overhead lines of each transformer substation so as to establish communication between the two loops of overhead lines of the transformer substation;
and the inter-station contact ring network point is configured to connect four overhead lines corresponding to the two transformer substations in series so as to establish contact between the two transformer substations.
The system further comprises: and the common ring network point is used for being connected in series in the target ring network frame so as to transmit the acquired transmission current to a second load object in a power supply area according to a second current type, wherein the second current type is the type of current used by the second load object.
The target halftone dot includes: a flexible multi-state switch;
the flexible multi-state switch is configured to determine whether the first current type is the same as a current type of the delivered current and to convert the current type of the delivered current to the first current type if the first current type is not the same as the current type of the delivered current.
The common halftone dot comprises: a flexible multi-state switch;
is configured to determine whether the second current type is the same as a current type of the delivered current and to convert the current type of the delivered current to the second current type if the second current type is not the same as the current type of the delivered current.
The target and common halftone dots include at least one of: looped netowrk cabinet, box-type substation and distribution substation.
The system further comprises: communication lines and other ring net racks; the other looped network racks are the same as or different from the target looped network rack in the number of the transformer substations and/or the number of the target looped network points;
the communication line is configured to determine a channel node in the target ring network point of the target ring network frame and the target ring network points of other ring network frames, and determine the communication line based on the channel node to establish communication between the plurality of target ring network frames.
The system further comprises: a multi-power load object;
the multi-power supply load object is configured to determine an inter-station contact ring network point in the target ring network points and establish contact with the inter-station contact ring network point.
In a second aspect, the invention further provides a grid construction method suitable for the rural overhead power distribution network, which comprises the following steps:
respectively determining the transmission current of two substations, and transmitting the transmission current to a plurality of target points of a ring; each transformer substation corresponds to two loops of overhead lines;
on the basis of the target ring network points, performing inter-station contact and intra-station contact on the two transformer substations respectively to obtain a target ring network frame;
based on the target looped network frame, the transmission current is transmitted to a first load object of a power supply area according to a first current type; wherein the first current type is a type of current used by the first load object.
In a third aspect, the present invention further provides a grid structure constructing apparatus suitable for a rural overhead power distribution network, including:
the determining unit is used for respectively determining the transmission currents of the two substations and transmitting the transmission currents to the plurality of target link points; each transformer substation corresponds to two loops of overhead lines;
the contact unit is used for respectively performing inter-station contact and intra-station contact on the two transformer substations based on the target ring network points to obtain a target ring network frame;
the conveying unit is used for conveying the conveying current to a first load object in a power supply area according to a first current type based on the target ring network frame; wherein the first current type is a type of current used by the first load object.
In a fourth aspect, the present invention also provides a computer-readable storage medium, on which a computer program is stored, which computer program, when executed by a processor, performs the steps of the second aspect.
The invention has the advantages and effects that:
the invention provides a grid system suitable for a rural overhead power distribution network and a grid construction method. Aiming at two transformer substations, each transformer substation corresponds to two loops of overhead lines, and inter-station contact and intra-station contact can be respectively carried out on the two loops of overhead lines of the two transformer substations through a plurality of target ring network points to obtain a target ring network frame, and the transmission current is transmitted to a first load object in a power supply area according to a first current type based on the target ring network frame. Here, when this target looped netowrk rack broke down, can amputate the trouble section circuit through the target looped netowrk point, the overhead line that does not break down changes the supply to the load that the trouble section corresponds to satisfy "N-1 inspection principle", simultaneously, be used for the target looped netowrk point to carry out many networking to the target looped netowrk rack, and carried out the station liaison of transformer substation, make the liaison of target looped netowrk rack comparatively reasonable, improved the load factor of target looped netowrk rack, and improved the utilization ratio of power supply resource.
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 appreciated 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 will be able to derive additional related drawings therefrom without the benefit of the inventive faculty.
Fig. 1 is a schematic diagram illustrating a network frame of a single-radiation distribution network according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram illustrating a network frame of a single-ring network distribution network according to an embodiment of the disclosure;
fig. 3 is a schematic diagram illustrating a grid system suitable for a rural overhead power distribution network according to an embodiment of the disclosure;
fig. 4 is a schematic diagram of a target ring network rack provided by the disclosed embodiment of the invention;
fig. 5 shows a topology diagram of a target ring network frame provided by the disclosed embodiment of the invention;
FIG. 6 is a schematic diagram of a grid-type power supply structure for supplying power to rural areas provided by the disclosed embodiments of the invention;
fig. 7 shows a flow chart of a method for constructing a grid structure suitable for a rural overhead power distribution network according to the disclosed embodiment of the invention;
fig. 8 is a schematic diagram illustrating a network frame construction device suitable for a rural overhead power distribution network according to an embodiment of the disclosure;
FIG. 9 shows a schematic diagram of a computer device provided by the disclosed embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of 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 present disclosure, presented in the figures, is not intended to limit the scope of the claimed disclosure, 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 rural power distribution network frame, the power supply area is usually supplied with power through a single-radiation or single-ring network frame, so that the planning cost and the construction cost of the power distribution network frame are saved.
However, as shown in fig. 1, a single radiation distribution network rack is shown, where a substation a corresponds to a return overhead line, and the load rate of the single radiation distribution network rack can reach 100%, but the single radiation distribution network rack does not meet the "N-1 inspection principle", and when a fault occurs in the single radiation distribution network rack, the load corresponding to the fault section cannot be transferred, so that the reliability of power supply is low.
As shown in fig. 2, a single-ring network distribution network frame is shown, wherein a substation a and a substation B correspond to an overhead line respectively, and the single-ring network distribution network frame satisfies an "N-1 inspection principle", and when a fault occurs in the single-ring network distribution network frame, a load corresponding to a fault section can be transferred through an overhead line that does not have the fault, but because the single-ring network distribution network frame is unreasonable in contact, the load rate of the single-ring network is low, and thus the utilization rate of power supply resources is low.
Based on the research, the invention discloses a network frame system suitable for a rural overhead power distribution network and a network frame construction method. Here, when this target looped netowrk rack broke down, can amputate the trouble section circuit through the target looped netowrk point, the overhead line that does not break down changes the supply to the load that the trouble section corresponds to satisfy "N-1 inspection principle", simultaneously, be used for the target looped netowrk point to carry out many networking to the target looped netowrk rack, and carried out the station liaison of transformer substation, make the liaison of target looped netowrk rack comparatively reasonable, improved the load factor of target looped netowrk rack, and improved the utilization ratio of power supply resource.
For the convenience of understanding the present embodiment, a detailed description will be given to a grid system suitable for an overhead power distribution network in a rural area, which is disclosed in the embodiments of the present disclosure.
Referring to fig. 3, a network rack system suitable for a rural overhead power distribution network provided by the embodiment of the present disclosure is shown in fig. 2, and the network rack system suitable for a rural overhead power distribution network includes: two substations 10, a plurality of target ring-off points 20 and an overhead line 30;
the two substations 10 are configured to respectively determine the transmission current, and respectively transmit the transmission current to the matched target ring-out points through the two corresponding overhead lines.
In an embodiment of the present disclosure, the two substations are configured to receive a current generated by a power plant and change the received current into a transmission current, where the current received by the substation may be a direct current, and the determined transmission current may be an alternating current. In particular, the voltage class of the substation may be 10KV, 20KV, 35KV, 66KV, 110KV, etc., and the voltage classes of the two substations may be the same or different.
The plurality of target ring network points 20 are configured to connect two overhead lines of each substation, connect the two substations to obtain a target ring network frame, and transmit the acquired transmission current to a first load object in a power supply area according to a first current type; wherein the first current type is a type of current used by the first load object.
In the embodiment of the present disclosure, as shown in fig. 4, which is a schematic diagram of the target ring network rack, it can be seen from the diagram that the plurality of target ring network points may include an intra-station contact ring network point for contacting two overhead lines of each substation, and an inter-station contact ring network point for contacting the two substations. It should be understood that the target ring network rack may be used to supply power to users in a power supply area, where the users may include users corresponding to the first load object, the current types may include dc current and ac current, and the first current type may be dc current or ac current.
The overhead line 30 is configured to communicate the plurality of target ring network points and the two substations based on the target ring network frame.
In the embodiment of the present disclosure, the overhead line may be a 10KV overhead line, and when the target ring network rack is used to connect a plurality of target ring network points and two substations, a connection manner of the target ring network points may be determined first, and the target ring network points and the substations are connected together based on the connection manner, where the connection manner may include single bus connection, single bus segment connection, and the like. In addition, other connection modes for connecting the target ring-site and the substation may be used, which is not limited in this disclosure.
In the embodiment of the disclosure, for two transformer substations, each transformer substation corresponds to two loops of overhead lines, and inter-station and intra-station contact can be respectively performed on the two loops of overhead lines of the two transformer substations through a plurality of target ring network points to obtain a target ring network rack, and a transmission current is transmitted to a first load object in a power supply area according to a first current type based on the target ring network rack. When the target ring network frame fails, the line of the fault section can be cut off through the target ring network point, and the load corresponding to the fault section is transferred through the overhead line which does not fail, so that the N-1 inspection principle is met, each overhead line has reasonable segmentation and connection, the self-healing capability of automatic fault detection, isolation, network reconstruction and power restoration is realized, the optimal resource allocation and asset efficiency are realized, and the power grid benefit efficiency is fully exerted. Meanwhile, the target ring network frame is reasonably connected, the load rate of the target ring network frame is improved, and the utilization rate of power supply resources is improved.
In an alternative embodiment, the plurality of target halftone dots 20 includes: an inter-station contact ring network point 21 and an intra-station contact ring network point 22;
the in-station interconnection ring network point 21 is configured to serially connect two overhead lines of each transformer substation so as to establish communication between the two overhead lines of the transformer substation;
and the inter-station contact ring network point 22 is configured to serially connect four overhead lines corresponding to the two substations to establish contact between the two substations.
In the embodiment of the present disclosure, two overhead lines of each substation may be connected in series based on the in-station connection ring point. Specifically, as shown in fig. 3, two loops of overhead lines "line a" and "line B" of the substation a may be connected in series through the in-station contact ring network point a, and two loops of overhead lines "line c" and "line d" of the substation B may be connected in series through the in-station contact ring network point B.
Next, can contact four times of overhead lines that correspond above-mentioned two transformer substations based on the contact looped netowrk point between the stations that determine to contact four times of overhead lines through the contact looped netowrk point between the stations and concatenate above-mentioned four times of overhead lines, establish the contact between two transformer substations. Specifically, as shown in fig. 4, the overhead line "line a" of the substation a and the overhead line "line C" of the substation B may be connected based on the inter-station contact ring point C, and the overhead line "line B" of the substation a and the overhead line "line D" of the substation B may be connected based on the inter-station contact ring point D.
Here, as shown in fig. 5, a topology diagram of the target ring network frame is shown, in which the inter-station communication ring network point is a solid vertex, and the intra-station communication ring network point is a hollow vertex. According to the topological graph, the target ring net rack is of a diamond-shaped net structure, and in the diamond-shaped net structure, the target ring net rack of the diamond-shaped net structure can be established by taking a target ring net point as a vertex and taking an overhead line as a side.
In the target ring network frame of the diamond network structure, under the condition that the overhead line corresponding to any one edge is determined as the fault line, the load on the fault line can be transferred through the overhead lines corresponding to other diamond edges so as to meet the N-1 inspection principle, and therefore, the load rate of the target ring network frame of the diamond network structure can be 3/4, namely 75%.
For example, if the fault line is as shown in fig. 4 and 5, the inter-station interconnection ring point C and the intra-station interconnection ring point a may act to cut the fault line, and the load on the fault line is transferred through the remaining overhead lines in the target ring network rack, thereby completing the self-healing of the target network switching rack.
In this disclosed embodiment, above-mentioned target contact node includes contact node and the in-station contact node between the stations, can contact above-mentioned two transformer substations based on contact node and the in-station contact node between these stations to make the segmentation of the rack contact form of determining more reasonable, improved the load factor of target looped netowrk rack, and improved the utilization ratio of power supply resource.
In an optional embodiment, the grid system suitable for the rural overhead power distribution network further includes: and a common ring-out point 40, where the common ring-out point is configured to be connected in series in the target ring network frame, so as to transmit the acquired transmission current to a second load object in a power supply area according to a second current type, where the second current type is a type of current used by the second load object.
In the embodiment of the present disclosure, in order to adapt to load changes caused by user migration in a power supply area, a common ring network point may be connected in series in the target ring network rack, wherein a branch line may be established based on the common ring network point to supply power to users in the power supply area through the branch line, and the branch line may be an overhead line meeting power supply requirements. Here, the second load object may be a new user in the power supply area, and the second current type may be an alternating current and/or a direct current.
In specific implementation, assuming that a sub-region is newly added to the power supply region, a common ring-back point can be accessed to the overhead line corresponding to the sub-region, and power is supplied to users in the sub-region through the common ring-back point. It should be understood that if new subscribers continue to be added to the sub-area, the new subscribers may be connected to the target ring network frame or branch line.
In the embodiment of the present disclosure, a common ring network point may be accessed to the target ring network rack to adapt to the migration of users in a power supply area, so that the target ring network rack has an inclusive property and an adaptive property, where the inclusive property is a characteristic of flexibly accepting access of a distributed power supply, an electric vehicle, energy storage, and the like to a power grid, and the adaptive property is uncertainty of power generation and power utilization behaviors of a matched power supply and two ends of a user, and supports access, exit, and interaction of various market main bodies.
In an alternative embodiment, the target halftone dot 20 includes: a flexible multi-state switch;
the flexible multi-state switch is configured to determine whether the first current type is the same as a current type of the delivered current and to convert the current type of the delivered current to the first current type if the first current type is not the same as the current type of the delivered current.
In this disclosure, the target ring network node may include or be replaced by a flexible multi-state switch, where, when the first current type is different from the current type of the transmission current, the flexible multi-state switch may convert the transmission current, and directly supply the converted first current type to a user, without accessing a converter to convert the type of the transmission current.
For example, the current provided by the substation may be alternating current, and in case the second current type required by the user is direct current, the flexible multi-state switch may convert the alternating current into direct current and supply the direct current to the user, it being understood that in case the first current type required by the user is alternating current, the flexible multi-state switch may also supply the alternating current directly to the user. 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, the factors such as switching loss and impact current are considered, the interconnection switch cannot be frequently switched on and off, the traditional network reconstruction is difficult to achieve real-time adjustment of the power distribution system, the flexible multi-state switch is widely concerned with the powerful real-time power control capability, the flexible multi-state switch is applied to the field of operation control of the power distribution system, the defect that the primary 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 an alternative embodiment, the common looping point 40 includes a flexible multi-state switch;
the flexible multi-state switch is configured to determine whether the second current type is the same as the current type of the delivered current and to convert the current type of the delivered current to the second current type if the second current type is not the same as the current type of the delivered current.
In this disclosure, the common ring network node may include or be replaced by a flexible multi-state switch, where the second load object is a newly added subscriber in the power supply area, and when the second current type is different from the current type of the transmission current, the flexible multi-state switch may convert the transmission current, and directly supply the converted second current type to the newly added subscriber, without accessing a converter to convert the type of the transmission current.
For example, the current provided by the substation may be an alternating current, and in the case that the second current type required by the newly added user is a direct current, the flexible multi-state switch may convert the alternating current into a direct current and supply the direct current to the newly added user. 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 interconnection 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 an alternative embodiment, the target halftone dot 20 and the common halftone dot 40 include at least one of the following: looped netowrk cabinet, box-type substation and distribution substation.
In the embodiment of the disclosure, the ring main unit is a switch cabinet, and includes an electrical device installed in a steel plate metal cabinet body or made into an assembled interval ring main unit, and a core part of the switch cabinet adopts a load switch and a fuse for supplying a transmission current acquired from a target ring main rack to a user and for cutting off a fault current when the target ring main rack has a fault such as a short circuit.
The box-type substation is a compact complete set of distribution equipment which combines a distribution transformer of high-voltage switch equipment, low-voltage switch equipment, electric energy metering equipment, a reactive compensation device and the like in one or more boxes according to a certain wiring scheme, is used for supplying a transmission current acquired from a target ring network frame to a user, and can be used for cutting off fault current when the target ring network frame has faults such as short circuit and the like.
The power distribution station is a high-voltage power distribution device with the functions of opening and closing and distributing electric energy, is used for supplying the transmission current acquired from the target ring network frame to users, and can be used for cutting off fault current when the target ring network frame has faults such as short circuit and the like.
In the embodiment of the present disclosure, the target ring-network point may include a ring main unit, a box-type substation, a distribution station, and the like, so that the application range of the scheme is increased.
In an optional embodiment, the grid system suitable for the rural overhead power distribution network further comprises: communication lines and other ring net racks; the other looped network racks are the same as or different from the target looped network rack in the number of the transformer substations and/or the number of the target looped network points;
the communication line is configured to determine a channel node in a target ring network point of the target ring network frame and target ring network points of other ring network frames, and determine the communication line based on the channel node to establish communication among the plurality of target ring network frames.
In the embodiment of the present disclosure, the other ring network frame may be a ring network frame including a target ring network point, specifically, the other ring network frame may be the same as or different from the target ring network frame, and the number of substations included in the other ring network frame and the number of target ring network points are not limited herein.
It should be understood that, with the development of rural areas and the development of power distribution network planning technology, on the basis of the original ring network frame, the newly added ring network frame often cannot be in contact with the original ring network frame, and the power supply area corresponding to the original ring network frame and the power supply area corresponding to the newly added ring network frame are independent of each other.
On this basis, the present disclosure provides a way of connecting a plurality of ring network racks (i.e. the above-mentioned target ring network rack and other ring network racks) through a connecting line, and the plurality of ring network racks are combined into a grid power supply structure for supplying power to rural areas as shown in fig. 6, where each ring network rack is a power supply unit in the grid power supply structure.
As shown in fig. 6, a power supply area 2 is newly added to the rural area due to the development plan, the original ring network frame is the other ring network frame, the other ring network frame is a dual ring network, the dual ring network is composed of two substations and two target ring network points and is used for supplying power to the power supply area 1, and the newly added ring network frame is the target ring network frame and is used for supplying power to the newly added power supply area 2 in the rural area.
However, with the development of the power supply area 2, the number of users in the power supply area 2 gradually increases, the power supply amount provided by the target ring network rack is insufficient, at this time, the target ring network rack can send a load transfer request to the dual-ring network, and if the power supply amount of the dual-ring network can be supplied to the target ring network rack, the dual-ring network can supply power to the users in the target ring network rack through the connection line between the target ring network rack and the dual-ring network without performing rack planning again.
It should be understood that in actual rack planning, a plurality of power supply units may be connected together, so that the support of power resources and load transfer may be realized among the plurality of power supply units. The number of power supply units included in the grid power supply structure is not particularly limited in the present disclosure.
In this disclosure, the channel node may be an inter-station interconnection ring point in the target ring point, and the interconnection line may be an overhead line.
As can be seen from the above description, in the embodiment of the present disclosure, load transfer and support between the target ring network rack and other ring network racks can be realized through the communication line, so as to meet the development requirement of the power supply area, and reduce the cost of network rack planning and network rack construction.
In an optional embodiment, the above grid system for rural overhead power distribution network further comprises: a multi-power load object 50;
the multi-power supply load object 50 is configured to determine an inter-station contact ring point among the plurality of target ring points, and establish contact with the inter-station contact ring point.
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 ring network rack, 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, the multiple power supply load objects may be connected in series between the inter-station contact ring site C and the inter-station contact ring site D shown in fig. 3, and the multiple power supply load objects may be power distribution stations including two main transformers, so that the power distribution stations may supply power through the overhead lines "line a" and "line C", and use "line b" and "line D" as spare 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 by connecting the multiple power supply load objects in series on a plurality of inter-station contact ring network points, and the power supply stability is improved.
Referring to fig. 7, based on the same inventive concept, an embodiment of the present disclosure further provides a network frame construction method suitable for a rural overhead power distribution network, where the method includes steps S101 to S105:
s101: respectively determining the transmission current of two substations, and transmitting the transmission current to a plurality of target points; wherein, every transformer substation corresponds two overhead lines.
In the embodiment of the present disclosure, the two substations are configured to receive a current generated by a power plant and change the received current into a transmission current, where the current received by the substation may be a direct current, and the determined transmission current may be an alternating current. In particular, the voltage class of the substation may be 10KV, 20KV, 35KV, 66KV, 110KV, etc., and the voltage classes of the two substations may be the same or different. In addition, the overhead line may be a 10KV overhead line.
S103: and respectively performing inter-station contact and intra-station contact on the two transformer substations based on the plurality of target ring network points to obtain the target ring network frame.
In the embodiment of the present disclosure, as shown in fig. 4, which is a schematic diagram of the target ring network rack, it can be seen from the diagram that the plurality of target ring network points may include an intra-station contact ring network point for contacting two overhead lines of each substation, and an inter-station contact ring network point for contacting the two substations. It should be understood that the target ring network rack may be used to supply power to users in a power supply area, where the users may include users corresponding to the first load object, the current types may include dc current and ac current, and the first current type may be dc current or ac current.
S105: based on the target looped network frame, the transmission current is transmitted to a first load object of a power supply area according to a first current type; wherein the first current type is a type of current used by the first load object.
In the embodiment of the present disclosure, when a plurality of target ring-network points and two substations are connected based on the target ring-network frame, a connection manner of the target ring-network points may be first determined, and the target ring-network points and the substations are connected together based on the connection manner, where the connection manner may include single bus connection, single bus segment connection, and the like. In addition, other connection modes for connecting the target ring-out point and the substation together may also be used, which is not limited in this disclosure.
In summary, in the embodiment of the present disclosure, for two transformer substations, each transformer substation corresponds to two loops of overhead lines, and inter-station and intra-station communication may be performed on the two loops of overhead lines of the two transformer substations through a plurality of target ring network points, so as to obtain a target ring network rack, and transmit a transmission current to a first load object in a power supply area according to a first current type based on the target ring network rack. When the target ring network frame fails, the line of the fault section can be cut off through the target ring network point, and the load corresponding to the fault section is transferred through the overhead line which does not fail, so that the N-1 inspection principle is met, each overhead line has reasonable segmentation and connection, the self-healing capability of automatic fault detection, isolation, network reconstruction and power restoration is realized, the optimal resource allocation and asset efficiency are realized, and the power grid benefit efficiency is fully exerted. Meanwhile, the target ring network frame is reasonably connected, the load rate of the target ring network frame is improved, and the utilization rate of power supply resources is improved.
It will be understood by those of skill in the art that in the above method of the present embodiment, the order of writing the steps does not imply a strict order of execution and does not impose any limitations on the implementation, as the order of execution of the steps should be determined by their function and possibly inherent logic.
Based on the same inventive concept, the embodiment of the present disclosure further provides a grid construction device applicable to a rural overhead power distribution network corresponding to the grid construction method applicable to the rural overhead 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 above-mentioned grid construction method applicable to the rural overhead 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. 8, a schematic diagram of a network frame construction device suitable for a rural overhead power distribution network provided in an embodiment of the present disclosure is shown, the device includes: a determination unit 71, a communication unit 72, and a conveyance unit 73; wherein the content of the first and second substances,
a determining unit 71, configured to determine the transmission currents of the two substations, respectively, and transmit the transmission currents to a plurality of target points of the ring; each transformer substation corresponds to two loops of overhead lines;
the contact unit 72 is used for performing inter-station contact and intra-station contact on the two substations respectively based on the plurality of target ring network points to obtain a target ring network frame;
the conveying unit 73 is configured to convey the conveying current to a first load object in a power supply area according to a first current type based on the target ring network frame; wherein the first current type is a type of current used by the first load object.
In the embodiment of the disclosure, for two transformer substations, each transformer substation corresponds to two loops of overhead lines, and inter-station and intra-station contact can be respectively performed on the two loops of overhead lines of the two transformer substations through a plurality of target ring network points to obtain a target ring network rack, and a transmission current is transmitted to a first load object in a power supply area according to a first current type based on the target ring network rack. When the target ring network frame fails, the line of the fault section can be cut off through the target ring network point, and the load corresponding to the fault section is transferred through the overhead line which does not fail, so that the N-1 inspection principle is met, each overhead line has reasonable segmentation and connection, the self-healing capability of automatic fault detection, isolation, network reconstruction and power restoration is realized, the optimal resource allocation and asset efficiency are realized, and the power grid benefit efficiency is fully exerted. Meanwhile, the target ring network frame is reasonably connected, the load rate of the target ring network frame is improved, and the utilization rate of power supply resources is improved.
In one possible embodiment, the plurality of target halftone dots include: the inter-station contact ring network point and the intra-station contact ring network point, the contact unit 72, is further configured to:
connecting the two overhead lines of each transformer substation in series to establish communication between the two overhead lines of the transformer substation;
and connecting the four loops of overhead lines corresponding to the two transformer substations in series to establish communication between the two transformer substations.
In a possible embodiment, the device further comprises: and the common ring network point is used for being connected in series in the target ring network frame so as to transmit the acquired transmission current to a second load object in a power supply area according to a second current type, wherein the second current type is the type of current used by the second load object.
In one possible embodiment, the target halftone dot includes: a flexible multi-state switch; the communication unit 72, further for:
determining whether the first current type is the same as the current type of the transmission current, and converting the current type of the transmission current into the first current type when the first current type is not the same as the current type of the transmission current.
In one possible implementation, the generic ring network point includes: flexible multi-state switch, communication unit 72, further for:
determining whether the second current type is the same as the current type of the delivered current, and converting the current type of the delivered current into the second current type if the second current type is not the same as the current type of the delivered current.
In one possible embodiment, the target and common halftone dots include at least one of: looped netowrk cabinet, box-type substation and distribution substation.
In a possible embodiment, the device further comprises: communication lines and other ring net racks; wherein, the quantity of other looped netowrk net rack for the transformer substation quantity that contains and/or the quantity of target looped netowrk point and the same or different looped netowrk net rack of target looped netowrk net rack, the device still is used for:
and determining channel nodes in the target ring network points of the target ring network frame and the target ring network points of other ring network frames, and determining the contact line based on the channel nodes so as to establish the contact among the plurality of target ring network frames.
In a possible embodiment, the device further comprises: a multi-power source load object, the apparatus further for:
and determining an inter-station contact ring network point in the plurality of target ring network points, and establishing contact with the inter-station contact ring network point.
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 network frame construction method applicable to the rural overhead power distribution network in fig. 8, an embodiment of the present disclosure further provides a computer device 800, and as shown in fig. 9, a schematic structural diagram of the computer device 800 provided in the embodiment of the present disclosure includes:
a processor 81, a memory 82, and a bus 83; the memory 82 is used for storing execution instructions and includes a memory 821 and an external memory 822; the memory 821 herein is also referred to as an internal memory, and is configured to temporarily store operation data in the processor 81 and data exchanged with the external memory 822 such as a hard disk, the processor 81 exchanges data with the external memory 822 through the memory 821, and when the computer apparatus 800 operates, the processor 81 communicates with the memory 82 through the bus 83, so that the processor 81 executes the following instructions:
respectively determining the transmission current of two substations, and transmitting the transmission current to a plurality of target points of a ring; each transformer substation corresponds to two loops of overhead lines;
on the basis of the target ring network points, performing inter-station contact and intra-station contact on the two transformer substations respectively to obtain a target ring network frame;
based on the target looped network frame, the transmission current is transmitted to a first load object of a power supply area according to a first current type; wherein the first current type is a type of current used by the first load object.
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 grid construction method for a rural overhead 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 embodiment of the present disclosure further provides 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 grid construction method for a rural overhead power distribution network described in the above method embodiment, which may be specifically referred to in the above method embodiment 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: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.
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 (10)
1. The utility model provides a rack system suitable for rural overhead power distribution network which characterized in that includes: two substations, a plurality of target ring-off points and overhead lines;
the two substations are configured to respectively determine the transmission current and respectively transmit the transmission current to the matched target ring-site through the two corresponding overhead lines;
the plurality of target ring network points are configured to connect two overhead lines of each transformer substation, connect the two transformer substations to obtain a target ring network frame, and transmit the acquired transmission current to a first load object in a power supply area according to a first current type; wherein the first current type is a type of current used by the first load object;
the overhead line is configured to communicate the plurality of target ring network points and the two substations based on the target ring network frame.
2. The system of claim 1, wherein the plurality of target nexus points comprises: an inter-station contact ring network point and an intra-station contact ring network point;
the in-station interconnection ring network point is configured to serially connect two loops of overhead lines of each transformer substation so as to establish communication between the two loops of overhead lines of the transformer substation;
and the inter-station contact ring network point is configured to connect four overhead lines corresponding to the two transformer substations in series so as to establish contact between the two transformer substations.
3. The system of claim 1, further comprising: and the common ring network point is used for being connected in series in the target ring network frame so as to transmit the acquired transmission current to a second load object in a power supply area according to a second current type, wherein the second current type is the type of current used by the second load object.
4. The system of claim 2, wherein the target halftone dot comprises: a flexible multi-state switch;
the flexible multi-state switch is configured to determine whether the first current type is the same as a current type of the delivered current and to convert the current type of the delivered current to the first current type if the first current type is not the same as the current type of the delivered current.
5. The system of claim 3, wherein the common point-of-presence points comprise: a flexible multi-state switch;
is configured to determine whether the second current type is the same as a current type of the delivered current and to convert the current type of the delivered current to the second current type if the second current type is not the same as the current type of the delivered current.
6. The system according to claim 2 or 3, wherein the target and common halftone dots comprise at least one of: looped netowrk cabinet, box-type substation and distribution substation.
7. The system of claim 1, further comprising: communication lines and other ring net racks; the other looped network racks are the same as or different from the target looped network rack in the number of the transformer substations and/or the number of the target looped network points;
the communication line is configured to determine a channel node in the target ring network point of the target ring network frame and the target ring network points of other ring network frames, and determine the communication line based on the channel node to establish communication between the plurality of target ring network frames.
8. The system of claim 2, further comprising: a multi-power load object;
the multi-power supply load object is configured to determine an inter-station contact ring network point in the target ring network points and establish contact with the inter-station contact ring network point.
9. A network frame construction method suitable for a rural overhead power distribution network is characterized by comprising the following steps:
respectively determining the transmission current of two substations, and transmitting the transmission current to a plurality of target points; each transformer substation corresponds to two loops of overhead lines;
based on the target looped network points, performing inter-station contact and intra-station contact on the two transformer substations respectively to obtain a target looped network frame;
based on the target looped network frame, the transmission current is transmitted to a first load object of a power supply area according to a first current type; wherein the first current type is a type of current used by the first load object.
10. The utility model provides a rack founds device suitable for rural built on stilts distribution network which characterized in that includes:
the system comprises a determining unit, a calculating unit and a calculating unit, wherein the determining unit is used for respectively determining the transmission currents of two substations and transmitting the transmission currents to a plurality of target nodes; each transformer substation corresponds to two loops of overhead lines;
the communication unit is used for performing inter-station communication and intra-station communication on the two transformer substations respectively based on the plurality of target ring network points to obtain a target ring network frame;
the transmission unit is used for transmitting the transmission current to a first load object of a power supply area according to a first current type based on the target ring network frame; wherein the first current type is a type of current used by the first load object.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115856618A (en) * | 2023-03-01 | 2023-03-28 | 国网山西省电力公司电力科学研究院 | Low-voltage switch equipment short circuit testing device and method based on energy storage power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115856618A (en) * | 2023-03-01 | 2023-03-28 | 国网山西省电力公司电力科学研究院 | Low-voltage switch equipment short circuit testing device and method based on energy storage power supply |
| CN115856618B (en) * | 2023-03-01 | 2023-05-02 | 国网山西省电力公司电力科学研究院 | Low-voltage switch equipment short circuit test device and method based on energy storage power supply |
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