Differentiated flexible net rack planning method and system based on high and medium pressure coordination

Abstract

The differentiated flexible net rack planning method based on high and medium pressure coordination comprises the steps of judging whether a to-be-planned area is a city scene or a rural scene, if the to-be-planned area is the city scene, selecting a first net rack structure, and if the to-be-planned area is the rural scene, selecting a second net rack structure; constructing a plurality of alternative planning schemes based on the selected grid structure in combination with the planning requirements of the power distribution network; constructing a target function by taking the minimum annual comprehensive cost of power grid construction as a target; and screening out a scheme with the minimum annual comprehensive cost of power grid construction from the alternative planning schemes through the objective function. According to the design, a high and medium voltage power distribution network coordination strategy of an urban scene and a rural scene is defined, the flexible adjustment capability of the flexible grid structure is fully exerted, and efficient access of emerging flexible resources such as distributed new energy, energy storage equipment and electric vehicles can be adapted.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a differentiated flexible grid planning method based on high and medium voltage coordination. Background Art

[0002] Under the background of new power system, the transformation and upgrading of traditional distribution network to new distribution network has become an inevitable trend. At present, the domestic distribution network still aims to meet the power demand of loads. There is insufficient coordination between high-voltage distribution network and medium-voltage distribution network. The typical grid structure is mainly composed of overhead ties and cable ring networks. The ties and section switches are mainly traditional mechanical switches. The grid flexibility is generally insufficient, and it is difficult to fully adapt to the needs of high-proportion distributed power sources and multiple load access. At the same time, as users have higher and higher requirements for power quality, power supply companies need to consider the coordination of reliability and economy when determining the grid structure to meet the high reliability needs of differentiated users. Therefore, in order to meet these challenges, a differentiated flexible grid planning method based on high and medium voltage coordination is urgently needed to guide the standardized development of distribution networks under the new situation. Summary of the invention

[0003] The purpose of the present invention is to overcome the problems existing in the prior art of insufficient coordination between high-voltage distribution network and medium-voltage distribution network in traditional distribution networks, generally insufficient grid flexibility, and difficulty in fully adapting to the access needs of a high proportion of distributed power sources and multiple loads, and to provide a differentiated flexible grid planning method based on high- and medium-voltage coordination that coordinates reliability and economy.

[0004] To achieve the above objectives, the technical solution of the present invention is:

[0005] In a first aspect, the present invention provides a differentiated flexible grid planning method based on high and medium voltage coordination, the planning method comprising:

[0006] S1. Determine whether the area to be planned is an urban scene or a rural scene. If the area to be planned is an urban scene, select a first grid structure; if the area to be planned is a rural scene, select a second grid structure;

[0007] S2. Based on the selected grid structure and combined with the planning requirements of the distribution network, construct multiple alternative planning schemes;

[0008] S3, constructing an objective function with the goal of minimizing the annual comprehensive cost of power grid construction;

[0009] S4. Through the objective function, select the plan with the lowest annual comprehensive cost of power grid construction from the alternative planning plans.

[0010] In the first grid structure, the high voltage layer adopts a ring network, double radiation or single radiation structure, and the medium voltage layer adopts inter-station interconnection wiring;

[0011] In the second grid structure, the high voltage layer adopts a ring network or a double radial structure, and the medium voltage layer adopts a same-station connection or a single radial connection.

[0012] The first grid structure includes a high voltage layer, a medium voltage trunk layer, and a medium voltage access layer;

[0013] The high-voltage layer of the first grid structure includes two 220KV substations and two 110KV substations. The two 220KV substations are used to receive power from the ultra-high voltage grid and reduce the power from the ultra-high voltage grid to the 110KV level. The two 110KV substations are used to receive power output from the two 220KV substations and reduce the power output from the two 220KV substations to the medium voltage level. The outgoing line sides of the two 110KV substations form two sets of double radial connections respectively.

[0014] The medium-voltage trunk layer of the first grid structure includes two groups of wiring, the two groups of wiring are connected in series between the two 110KV substations to form a ring network structure, each group of wiring includes a dual-port SOP and multiple ring network cabinets, and at least one ring network cabinet is connected in series between the port of the dual-port SOP and the outgoing line side of the 110KV substation through a medium-voltage feeder;

[0015] The medium voltage access layer of the first grid structure includes a DC microgrid, an AC microgrid, photovoltaics, and energy storage connected to the medium voltage backbone layer;

[0016] The second grid structure includes a high voltage layer, a medium voltage trunk layer, and a medium voltage access layer;

[0017] The high-voltage distribution network of the second grid structure includes two 220KV substations and two 110KV substations. The two 220KV substations are used to receive power from the ultra-high voltage grid and reduce the power from the ultra-high voltage grid to the 110KV level. The two 110KV substations are used to receive power output from the two 220KV substations and reduce the power output from the two 220KV substations to the medium voltage level. The outgoing line sides of the two 110KV substations form two sets of double radial connections respectively.

[0018] The medium-voltage trunk layer of the second grid structure includes two groups of wiring, and both ends of each group of wiring are connected to the double-radial wiring on the outgoing line side of a 110KV substation to form a ring network structure. Each group of wiring includes a tie switch, and at least one circuit breaker is connected in series between the two ports of each tie switch and the outgoing line side of the 110KV substation through a medium-voltage feeder. The two ring network structures are connected through a dual-port SOP to achieve disturbance-free load flexible switching;

[0019] The medium voltage access layer of the second grid structure includes photovoltaic, energy storage, wind power, electric vehicle charging load, and AC / DC load connected to the medium voltage trunk layer.

[0020] In the first grid structure, the medium voltage feeder adopts a cable line, and the conductor cross-section of the medium voltage trunk layer line is not less than 300mm 2 , the conductor section of the medium voltage access layer line shall not be less than 150mm 2 , the number of ring main units connected in series in a single group of wiring in the medium voltage trunk layer shall not exceed 6, the ring main unit adopts 2-circuit cable incoming line and 3-4-circuit cable outgoing line, and the incoming and outgoing lines of the ring main unit are equipped with circuit breakers;

[0021] In the second grid structure, the medium voltage feeder adopts an overhead line, and the conductor cross-section of the medium voltage trunk layer line is not less than 240mm 2 , the conductor cross-section of the medium voltage access layer line shall not be less than 120mm 2 The single-group wiring in the medium-voltage trunk layer is divided into N sections by circuit breakers, N≤5, and the number of contact points of the single-group wiring in the medium-voltage trunk layer does not exceed 3.

[0022] In step S3, the objective function is:

[0023]

[0024] Where, C is the annual comprehensive cost; C TZ C is the investment and construction cost; YX C is the operation and maintenance cost; LOSS is the operating loss cost; C GD is the electricity purchase cost; C KKX is the reliability cost; r is the discount rate; n is the depreciation period; ξ 1 is the investment cost per unit length of overhead line; I is the set of overhead lines; L i is the length of the ith overhead line; ξ 2 is the investment cost of cable line per unit length; J is the cable line set; D j is the length of the jth cable line; ξ 3 is the unit capacity SOP investment cost; K is the network SOP switch set; S k is the planned design capacity of the kth SOP; L is the network energy storage set; ξ 4 E is the energy storage investment cost per unit capacity; l Design capacity for the lth energy storage plan; ε 1 is the overhead line operation and maintenance conversion factor; ε 2 is the operation and maintenance conversion factor of the cable line; ε 3 is the operation and maintenance conversion factor of SOP; 4is the operation and maintenance conversion coefficient of energy storage; η is the unit electricity price; M is the set of all lines; P m is the network loss of the mth line; N is the set of network substations; G n is the active power of the nth substation node; O is the set of network load nodes; μ is the unit power shortage cost; E o is the power shortage of the oth load node.

[0025] If the first grid structure is selected in step S1, the SOP capacity of the plurality of alternative planning schemes meets the following conditions:

[0026]

[0027] In the formula, S SOP is the capacity of the dual-port SOP, S Z,SOP is the minimum capacity of the dual-port SOP under normal operation, S G,SOP is the minimum capacity of the dual-port SOP under fault operation, ΔS L is the maximum load difference of the flexible interconnection line, S DG，L is the excess distributed generation capacity of the line, S L1 , S L2 They are the maximum loads that need to be transferred when two lines on the outgoing line side of the 110KV substation in the first grid structure fail;

[0028] If the second grid structure is selected in step S1, the SOP capacity of the plurality of alternative planning schemes meets the following conditions:

[0029]

[0030] In the formula, S SOP is the capacity of the dual-port SOP, S Z,SOP is the minimum capacity of the dual-port SOP under normal operation, S G,SOP is the minimum capacity of the dual-port SOP under fault operation, ΔS L is the maximum load difference of the flexible interconnection line, S DG，L is the excess distributed generation capacity of the line, S L1 , S L2 They are the maximum loads that need to be transferred when the outgoing line of the two 110KV substations in the second grid structure fails.

[0031] The multiple alternative planning schemes meet the following constraints: line flow constraints, node voltage constraints, line current carrying capacity constraints, SOP capacity configuration constraints, distributed power output constraints, and reliability constraints;

[0032] The line power flow constraint is:

[0033]

[0034] Where P i and Q i are the active and reactive injection amounts of node i respectively; j∈i is all nodes directly connected to node i; G ij and B ij are the real and imaginary parts of the node admittance matrix respectively; θ ij is the phase angle difference between nodes i and j; U i is the voltage amplitude of node i;

[0035] The node voltage constraint is:

[0036] U imin <U i <U imax ;

[0037] Where U i is the voltage amplitude at node i, U imin is the minimum voltage amplitude of node i, U imax is the maximum voltage amplitude of node i;

[0038] The line current carrying capacity constraint is:

[0039]

[0040] In the formula, I b is the current on branch b; is the maximum current that branch b can carry;

[0041] The SOP capacity configuration constraints are:

[0042]

[0043] In the formula, S k is the SOP capacity at node k; is the maximum capacity of SOP allowed to be installed at node k;

[0044] The output constraint of the distributed power source is:

[0045]

[0046] In the formula, S DG,k The output of the distributed power source at node k; is the maximum output of the distributed generation allowed to pass through node k;

[0047] The reliability constraints are:

[0048]

[0049] Where SAIDI i is the average power outage time per household at node i; is the maximum value of the average power outage time per household specified at node i.

[0050] In a second aspect, the present invention provides a differentiated flexible grid planning system based on high and medium voltage coordination, comprising:

[0051] A grid structure acquisition module is used to determine whether the area to be planned is a rural scene or an urban scene. If the area to be planned is an urban scene, a first grid structure is selected; if the area to be planned is a rural scene, a second grid structure is selected;

[0052] An alternative scheme building module is used to build multiple alternative planning schemes based on the selected grid structure and the planning requirements of the distribution network;

[0053] An objective function construction module is used to construct an objective function with the goal of minimizing the annual comprehensive cost of power grid construction;

[0054] The optimization module is used to select the plan with the lowest annual comprehensive cost of power grid construction from the alternative planning plans through the objective function.

[0055] In a third aspect, the present invention provides a differentiated flexible grid planning device based on high and medium voltage coordination, the device comprising a memory and a processor, the memory being used to store computer program code and transmit the computer program code to the processor;

[0056] The processor is used to execute the above-mentioned active distribution network flexible grid planning method according to the instructions in the computer program code.

[0057] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the above-mentioned method for planning a flexible grid of an active distribution network.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] 1. In the differentiated flexible grid planning method based on high and medium voltage coordination of the present invention, it is determined whether the area to be planned is an urban scene or a rural scene. According to whether the planning area is an urban scene or a rural scene, different basic grid structures are selected. Based on different basic grid structures, combined with the planning needs of the distribution network, alternative planning schemes are constructed, and the best among the alternative planning schemes is selected to obtain the final grid planning scheme. The above planning method comprehensively considers factors such as safety, reliability and economy, clarifies the coordination strategy of high and medium voltage distribution networks in urban scenes and rural scenes, and on this basis, combined with flexible interconnection equipment and AC and DC technology, respectively proposes differentiated flexible grid structures suitable for urban scenes and rural scenes, which can effectively promote the efficient access of emerging flexible resources such as distributed new energy, energy storage equipment, and electric vehicles. Therefore, this design clarifies the coordination strategy of high and medium voltage distribution networks in urban scenes and rural scenes, and proposes differentiated flexible grid structures suitable for urban scenes and rural scenes, which can effectively promote the efficient access of emerging flexible resources such as distributed new energy, energy storage equipment, and electric vehicles.

[0060] 2. The differentiated flexible grid structure based on high and medium voltage coordination proposed in the differentiated flexible grid planning method based on high and medium voltage coordination of the present invention, compared with the traditional grid structure, combines flexible interconnection equipment and AC and DC technology, gives full play to the flexible adjustment ability of the flexible grid structure, realizes flexible control of the flow between the connected feeders, and effectively promotes the efficient access of emerging flexible resources such as distributed new energy, energy storage equipment, and electric vehicles while comprehensively considering the flexibility, reliability and economy of the power grid. Therefore, the differentiated flexible grid structure based on high and medium voltage coordination proposed in the present invention gives full play to the flexible adjustment ability of the flexible grid structure, and can adapt to the efficient access of emerging flexible resources such as distributed new energy, energy storage equipment, and electric vehicles.

[0061] 3. In the differentiated flexible grid planning method based on high and medium voltage coordination of the present invention, the objective function is set to optimize the planning scheme, and the objective function fully considers the investment and construction cost, power purchase cost, operation and maintenance cost, loss cost, and reliability cost; at the same time, the objective function of this design refines the calculation formula of the line investment cost according to the conductor category, divides it into the overhead line investment cost and the cable line investment cost, and increases the operation and maintenance cost of the overhead line and the cable line. While meeting the load demand, the economy, reliability and safety of the distribution network are fully ensured, and the planning scheme is more comprehensive. Therefore, this design ensures the economy, reliability and safety of the distribution network in all aspects while meeting the load demand, and the planning scheme is more comprehensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a flow chart of a differentiated flexible grid planning method based on high and medium voltage coordination provided by an embodiment of the present invention.

[0063] Figure 2 It is a structural schematic diagram of the first grid structure provided by an embodiment of the present invention.

[0064] Figure 3 It is a structural schematic diagram of a second grid structure provided in an embodiment of the present invention.

[0065] Figure 4 This is a structural diagram of a differentiated flexible grid planning system based on high and medium voltage coordination provided by an embodiment of the present invention.

[0066] Figure 5 It is a schematic diagram of a transition solution for a flexible grid structure suitable for urban scenes provided by an embodiment of the present invention.

[0067] Figure 6 It is a schematic diagram of a transition solution for a flexible grid structure suitable for rural scenarios provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0068] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0069] In the prior art, the domestic distribution network has the problem of insufficient coordination between the high-voltage distribution network and the medium-voltage distribution network, and the general lack of grid flexibility, which makes it difficult to fully adapt to the access requirements of a high proportion of distributed power sources and multiple loads. In order to solve the problems existing in the prior art, the embodiment of the present invention provides a differentiated flexible grid planning method based on high and medium voltage coordination, such as Figure 1 As shown, Figure 1 It is a flow chart of a differentiated flexible grid planning method based on high and medium voltage coordination provided by an embodiment of the present invention, the method comprising steps S1 to S4;

[0070] S1. Determine whether the area to be planned is an urban scene or a rural scene. If the area to be planned is an urban scene, select a first grid structure; if the area to be planned is a rural scene, select a second grid structure;

[0071] In this embodiment, for urban scenarios, the first grid structure is selected, that is, the structure of "high voltage simple / weak-medium voltage strong"; for rural scenarios, the second grid structure is selected, that is, the structure of "high voltage simple-medium voltage simple / weak". Among them, for high-voltage distribution networks, based on the classification of the above-mentioned typical networking forms (i.e., radial, ring and mesh), the ring or mesh networking form plus inter-station chain connection is defined as "strong", the radial networking form plus ring network (single ring or double ring) or double radial connection is defined as "simple", and the radial networking form plus single radial connection is defined as "weak". For medium-voltage distribution networks, the ring or mesh networking form plus the connection with inter-station load transfer capability is defined as "strong" or "simple", the radial networking form plus ring network (self-loop) or double radial connection is defined as "simple"; the radial networking form plus single radial connection is defined as "weak".

[0072] In this embodiment, in the first grid structure, the high voltage layer adopts a ring network, a double-radial or a single-radial structure, and the medium voltage trunk layer adopts an inter-station liaison connection. Specifically, the ring network structure refers to connecting the high voltage distribution lines in a ring structure to form a closed network; the double-radial structure refers to leading two lines from different busbars of the same substation to form a double-radial power supply mode; the single-radial structure refers to the line leading from a substation or switch station to form a radial power supply mode; the inter-station liaison refers to connecting substations through liaison lines to achieve load transfer and improve power supply reliability.

[0073] In the step S1, the first grid structure includes a high voltage layer, a medium voltage trunk layer, and a medium voltage access layer, wherein the medium voltage trunk layer and the medium voltage access layer both belong to the medium voltage layer;

[0074] like Figure 2 As shown, Figure 2 It is a structural schematic diagram of the first grid structure provided by the embodiment of the invention. The high-voltage layer of the first grid structure includes two 220KV substations and two 110KV substations. The two 220KV substations are used to receive power from the ultra-high voltage power grid and reduce the power from the ultra-high voltage power grid to the 110KV level. The two 110KV substations are used to receive power output by the two 220KV substations and reduce the power output by the two 220KV substations to the medium voltage level. The outgoing line sides of the two 110KV substations form two sets of double radial connections respectively;

[0075] The medium-voltage trunk layer of the first grid structure includes two groups of wiring, the two groups of wiring are connected in series between the two 110KV substations, and the two groups of wiring form a ring network structure, each group of wiring includes a medium-voltage feeder connected in series with each other, a dual-port SOP and a plurality of ring network cabinets, and at least one ring network cabinet is connected in series between any port of the dual-port SOP and the outgoing line side of the 110KV substation through a medium-voltage feeder;

[0076] The medium-voltage access layer of the first grid structure includes a DC microgrid, an AC microgrid, photovoltaics, and energy storage connected to the medium-voltage backbone layer. In the medium-voltage access layer of the first grid structure, the DC microgrid and AC microgrid sub-networks are usually connected to the external power grid to obtain the required energy, but when there are emergencies such as main grid failures and natural disasters, they are operated independently off-grid to ensure the continuity and reliability of power supply; photovoltaics, energy storage and other flexible resources are directly connected to the medium-voltage access layer, and these resources are effectively managed and utilized through intelligent control, increasing the grid's ability to accept renewable energy.

[0077] In the first grid structure, the medium voltage feeder adopts a cable line, and the conductor cross-section of the medium voltage trunk layer line is not less than 300mm 2 , the conductor section of the medium voltage access layer line shall not be less than 150mm 2 , the number of ring main units connected in series in a single group of wiring in the medium voltage trunk layer shall not exceed 6, the ring main unit adopts 2-circuit cable incoming line and 3-4-circuit cable outgoing line, and the incoming and outgoing lines of the ring main unit are equipped with circuit breakers;

[0078] In this embodiment, in the second grid structure, the high voltage layer adopts a ring network or a double radial structure, and the medium voltage trunk layer adopts a same-station connection or a single radial connection. Specifically, the same-station connection refers to a multi-segment single connection connection mode, in which each medium voltage overhead line is segmented and connected through adjacent lines.

[0079] In the step S1, the second grid structure includes a high voltage layer, a medium voltage trunk layer, and a medium voltage access layer;

[0080] like Figure 3 As shown, Figure 3 It is a structural schematic diagram of the second grid structure provided by an embodiment of the present invention, wherein the high-voltage distribution network of the second grid structure includes two 220KV substations and two 110KV substations, wherein the two 220KV substations are used to receive power from the ultra-high voltage grid and reduce the power from the ultra-high voltage grid to the 110KV level, and the two 110KV substations are used to receive power output from the two 220KV substations and reduce the power output from the two 220KV substations to the medium voltage level, and the outgoing line sides of the two 110KV substations respectively form two groups of double radial connections;

[0081] The medium-voltage trunk layer of the second grid structure includes two groups of wiring, and both ends of each group of wiring are connected to the double-radial wiring on the outgoing line side of a 110KV substation to form a ring network structure. Each group of wiring includes a medium-voltage feeder, a tie switch and a plurality of circuit breakers connected in series with each other. At least one circuit breaker is connected in series between any port of the tie switch and the outgoing line side of the 110KV substation through the medium-voltage feeder, and the two ring network structures are connected through a dual-port SOP to achieve disturbance-free load flexible switching;

[0082] The medium-voltage access layer of the second grid structure includes photovoltaics, energy storage, wind power, electric vehicle charging loads, and AC / DC loads connected to the medium-voltage backbone layer. In the medium-voltage access layer of the second grid structure, new flexible resources such as photovoltaics, energy storage, electric vehicle charging loads, and wind power are directly connected to the medium-voltage access layer, and effective management and utilization of these distributed energy sources are achieved through intelligent control.

[0083] In the second grid structure, the medium voltage feeder adopts an overhead line, and the conductor cross-section of the medium voltage trunk layer line is not less than 240mm 2 , the conductor cross-section of the medium voltage access layer line shall not be less than 120mm 2 The single-group wiring in the medium-voltage trunk layer is divided into N sections by circuit breakers, N≤5, and the number of contact points of the single-group wiring in the medium-voltage trunk layer does not exceed 3.

[0084] In this embodiment, the number of medium-voltage feeders, ring network rooms, and circuit breakers in the first grid structure and the second grid structure can be increased or decreased in accordance with the planning requirements of the distribution network.

[0085] S2. Based on the selected grid structure and combined with the planning requirements of the distribution network, construct multiple alternative planning schemes.

[0086] Specifically, constructing multiple alternative planning schemes includes the following steps:

[0087] In combination with the planning requirements of the distribution network, the selected grid structure is further refined to obtain alternative planning schemes, which include the topological structure of the distribution network, the length of the line, the wiring mode, the number of ring main units and circuit breakers, the access nodes, the number of SOPs to be added, the access nodes, and the capacity. The alternative schemes can be automatically generated by computer software.

[0088] S3. Considering the impact of large-scale access of distributed new energy, the objective function is constructed with the goal of minimizing the annual comprehensive cost of power grid construction.

[0089] In this embodiment, the objective function is:

[0090]

[0091] Where, C is the annual comprehensive cost; C TZ C is the investment and construction cost; YX C is the operation and maintenance cost; LOSS is the operating loss cost; C GD is the electricity purchase cost; C KKX is the reliability cost; r is the discount rate; n is the depreciation period; ξ 1 is the investment cost per unit length of overhead line; I is the set of overhead lines; L i is the length of the i-th overhead line; ξ 2 is the investment cost of cable line per unit length; J is the cable line collection, and the cable line is a non-overhead line; D j is the length of the jth cable line; ξ 3 is the unit capacity SOP investment cost; K is the network SOP switch set; S k is the planned design capacity of the kth SOP; L is the network energy storage set; ξ 4 E is the energy storage investment cost per unit capacity; l Design capacity for the lth energy storage plan; ε 1 is the overhead line operation and maintenance conversion factor; ε 2 is the operation and maintenance conversion factor of the cable line; ε 3 is the operation and maintenance conversion factor of SOP; 4 is the operation and maintenance conversion coefficient of energy storage; η is the unit electricity price; M is the set of all lines, including overhead lines and cable lines; P m is the network loss of the mth line; N is the set of network substations; G n is the active power of the nth substation node; O is the set of network load nodes; μ is the unit power shortage cost; E i is the power shortage of the oth load node.

[0092] If the first grid structure is selected in step S1, among the multiple alternative planning schemes, the SOP capacity planning meets the following conditions:

[0093]

[0094] In the formula, S SOP is the capacity of the dual-port SOP, S Z,SOP is the minimum capacity of the dual-port SOP under normal operation, S G,SOP is the minimum capacity of the dual-port SOP under fault operation, ΔS L is the maximum load difference of the flexible interconnection line, S DG，L is the excess distributed generation capacity of the line, S L1 , S L2They are the maximum loads that need to be transferred when two lines on the outgoing side of two 110KV substations fail;

[0095] If the second grid structure is selected in step S1, among the multiple alternative planning schemes, the SOP capacity planning meets the following conditions:

[0096]

[0097] In the formula, S SOP is the capacity of the dual-port SOP, S Z,SOP is the minimum capacity of the dual-port SOP under normal operation, S G,SOP is the minimum capacity of the dual-port SOP under fault operation, ΔS L is the maximum load difference of the flexible interconnection line, S DG，L is the excess distributed generation capacity of the line, S L1 , S L2 They are the maximum loads that need to be transferred when the outgoing line of the two 110KV substations fails.

[0098] The multiple alternative planning schemes all meet the following constraints: line flow constraints, node voltage constraints, line current carrying capacity constraints, SOP capacity configuration constraints, distributed power output constraints, and reliability constraints;

[0099] The line power flow constraint is:

[0100]

[0101] Node i is a node in the grid structure, where P i and Q i are the active and reactive injection amounts of node i respectively; j∈i is all nodes directly connected to node i; G ij and B ij are the real and imaginary parts of the node admittance matrix respectively; θ ij is the phase angle difference between nodes i and j; U i is the voltage amplitude at node i. The line flow constraint is the power balance constraint of each node in the distribution network. In the distribution network, the inflow and outflow of active and reactive power at any node are balanced.

[0102] The node voltage constraint is:

[0103] U imin <U i <U imax ;

[0104] Where U i is the voltage amplitude at node i, U imin is the minimum voltage amplitude at node i, U imaxis the maximum voltage amplitude at node i.

[0105] The line current carrying capacity constraint is:

[0106]

[0107] In the formula, I b is the current on branch b; is the maximum current that branch b can carry.

[0108] The SOP capacity configuration constraints are:

[0109]

[0110] In the formula, S k is the SOP capacity at node k; is the maximum capacity of SOP allowed to be installed at node k;

[0111] The output constraint of the distributed power source is:

[0112]

[0113] In the formula, S DG,k The output of the distributed power source at node k; is the maximum output of the distributed generation allowed to pass through node k;

[0114] The reliability constraints are:

[0115]

[0116] Where SAIDI i is the average power outage time per household at node i; is the maximum value of the average power outage time per household specified at node i.

[0117] S4. Using the objective function, select the plan with the lowest annual comprehensive cost of power grid construction from the alternative planning plans. Specifically, the objective function is solved, and according to the solution, the plan that meets the requirements and has the lowest annual comprehensive cost of power grid construction is selected from the alternative planning plans.

[0118] In this embodiment, the scheme with the lowest annual comprehensive cost for grid construction is screened out from the alternative planning schemes through the objective function, including: calculating the annual comprehensive cost of each alternative planning scheme through the objective function, and selecting the one with the lowest annual comprehensive cost from the alternative planning schemes as the final construction plan.

[0119] The present invention replaces the traditional grid structure with flexible interconnection wiring, improves the AC and DC load carrying capacity and flow regulation capability of the grid, and gradually builds a more intelligent, efficient, and reliable differentiated flexible power grid, realizing the flexible transition from traditional distribution networks to active distribution networks, and supporting the high-quality development of new distribution networks.

[0120] In order to achieve the transformation based on the traditional grid structure, for the existing grid structure, the strategy of replacing the traditional tie switch with SOP or installing SOP at the end of the feeder of different single-ring networks can be adopted to transform the existing grid structure. The transformation transition scheme for the existing grid structure includes: a flexible grid structure transition scheme suitable for urban scenarios and the flexible grid structure transition scheme suitable for rural scenarios.

[0121] like Figure 5 As shown, Figure 5 It is a schematic diagram of a transition solution for a flexible grid structure suitable for urban scenarios provided by an embodiment of the present invention. The flexible grid structure transition solution suitable for urban scenarios includes: replacing the interconnecting switch within the single-ring network with a dual-port SOP, transforming the traditional single-ring network wiring into a medium-voltage flexible single-ring network wiring, and the SOP capacity needs to be greater than the maximum load of the single-ring network line, thereby realizing flexible closed-loop operation of the connected feeders and flexible control of the flow, effectively overcoming the step regulation limitations of traditional grid reconstruction.

[0122] like Figure 6 As shown, Figure 6 It is a schematic diagram of a transition scheme for a flexible grid structure suitable for rural scenarios provided by an embodiment of the present invention. The transition scheme for the flexible grid structure suitable for rural scenarios specifically includes: connecting the dual-port SOP port outlets to the feeder ends of different single interconnection lines to form a medium-voltage flexible interconnection connection, and the SOP capacity needs to be greater than 1 / 2 of the maximum load of the single interconnection line. By simultaneously transferring power through the SOP and the traditional interconnection switch, a larger range of interconnection can be achieved with fewer SOPs, maximizing the regulation potential of the SOP in time and space, and expanding the regulation range of the distribution system.

[0123] In summary, the present invention relates to the field of new distribution network planning, and proposes a differentiated flexible grid structure based on high and medium voltage coordination, a planning and construction strategy based on the coordinated development of high and medium voltage power grids, a differentiated grid structure, and a combination of flexible interconnection equipment and AC and DC technologies to improve the reliability, flexibility and economy of the distribution network, and realize the friendly access of distributed new energy, energy storage equipment, electric vehicles, etc., thereby promoting the efficient, orderly and coordinated development of new power system construction and energy green transformation.

[0124] According to the method described in the above embodiment, this embodiment will be further described from the perspective of a differentiated flexible grid planning system based on high and medium voltage coordination. The differentiated flexible grid planning system based on high and medium voltage coordination can be implemented as an independent entity or integrated in an electronic device, such as a terminal. The terminal may include a mobile phone, a tablet computer, etc.

[0125] See also Figure 4 , Figure 4 is a structural diagram of a differentiated flexible grid planning system based on high and medium voltage coordination provided by an embodiment of the present invention, such as Figure 4 As shown, the differentiated flexible grid planning system based on high and medium voltage coordination provided by the embodiment of the present invention includes: a grid structure acquisition module, an alternative solution construction module, an objective function construction module, and an optimization module.

[0126] The grid structure acquisition module is used to determine whether the area to be planned is a rural scene or an urban scene. If the area to be planned is an urban scene, the first grid structure is selected; if the area to be planned is a rural scene, the second grid structure is selected; the grid structure acquisition module is used to execute the step S1;

[0127] In the first grid structure, the high voltage layer adopts a ring network, a double-radial or single-radial structure, and the medium voltage trunk layer adopts inter-station connection wiring; the first grid structure includes a high voltage layer, a medium voltage trunk layer, and a medium voltage access layer;

[0128] The high-voltage layer of the first grid structure includes two 220KV substations and two 110KV substations. The two 220KV substations are used to receive electricity from the ultra-high voltage power grid and reduce the electricity from the ultra-high voltage power grid to the 110KV level. The two 110KV substations are respectively used to receive electricity output by the two 220KV substations and reduce the electricity output by the two 220KV substations to the medium voltage level. The outgoing line sides of the two 110KV substations form two groups of double-radial connections respectively; the medium-voltage trunk layer of the first grid structure includes two groups of connections, and the two groups of connections are connected in series between the two 110KV substations to form a ring network structure. Each group of connections includes a dual-port SOP and several ring network cabinets. At least one ring network cabinet is connected in series between the port of the dual-port SOP and the outgoing line side of the 110KV substation through a medium-voltage feeder; the medium-voltage access layer of the first grid structure includes a DC microgrid, an AC microgrid, photovoltaics, and energy storage connected to the medium-voltage trunk layer. In the first grid structure, the medium voltage feeder adopts a cable line, and the conductor cross-section of the medium voltage trunk layer line is not less than 300mm 2 , the conductor section of the medium voltage access layer line shall not be less than 150mm 2In the medium voltage trunk layer, there are no more than 6 ring main units connected in series in a single group of wiring. The ring main unit adopts 2 cable inputs and 3-4 cable outputs, and the inlet and outlet lines of the ring main unit are both equipped with circuit breakers.

[0129] In the second grid structure, the high voltage layer adopts a ring network or a double radial structure, and the medium voltage trunk layer adopts a same-station connection or a single radial connection; the second grid structure includes a high voltage layer, a medium voltage trunk layer, and a medium voltage access layer;

[0130] The high-voltage distribution network of the second grid structure includes two 220KV substations and two 110KV substations. The two 220KV substations are used to receive electricity from the ultra-high voltage grid and reduce the electricity from the ultra-high voltage grid to the 110KV level. The two 110KV substations are used to receive the electricity output by the two 220KV substations and reduce the electricity output by the two 220KV substations to the medium voltage level. The outgoing line sides of the two 110KV substations form two groups of double radial connections respectively; the medium-voltage trunk layer of the second grid structure includes It includes two groups of wiring, and both ends of each group of wiring are connected to the double radial wiring on the outgoing line side of a 110KV substation to form a ring network structure. The two ring network structures are connected through a dual-port SOP. Each group of wiring includes a connecting switch and several circuit breakers. There is at least one circuit breaker connected in series between the port of the connecting switch and the outgoing line side of the 110KV substation through a medium-voltage feeder; the medium-voltage access layer of the second grid structure includes photovoltaic, energy storage, wind power, electric vehicle charging loads, and AC / DC loads connected to the medium-voltage trunk layer. In the second grid structure, the medium-voltage feeder adopts an overhead line, and the conductor cross-section of the medium-voltage trunk layer line is not less than 240mm 2 , the conductor cross-section of the medium voltage access layer line shall not be less than 120mm 2 The single-group wiring in the medium-voltage trunk layer is divided into N sections by circuit breakers, N≤5, and the number of contact points of the single-group wiring in the medium-voltage trunk layer does not exceed 3.

[0131] The alternative scheme construction module is used to generate multiple alternative planning schemes based on the selected grid structure and the planning requirements of the distribution network; the alternative scheme construction module is used to execute the step S2.

[0132] If the first grid structure is selected in step S1, among the multiple alternative planning schemes, the SOP capacity planning meets the following conditions:

[0133]

[0134] In the formula, S SOP is the capacity of the dual-port SOP, S Z,SOP is the minimum capacity of the dual-port SOP under normal operation, S G,SOP is the minimum capacity of the dual-port SOP under fault operation, ΔSL is the maximum load difference of the flexible interconnection line, S DG，L is the excess distributed generation capacity of the line, S L1 , S L2 They are the maximum loads that need to be transferred when two lines on the outgoing side of two 110KV substations fail;

[0135] If the second grid structure is selected in step S1, among the multiple alternative planning schemes, the SOP capacity planning meets the following conditions:

[0136]

[0137] In the formula, S SOP is the capacity of the dual-port SOP, S Z,SOP is the minimum capacity of the dual-port SOP under normal operation, S G,SOP is the minimum capacity of the dual-port SOP under fault operation, ΔS L is the maximum load difference of the flexible interconnection line, S DG，L is the excess distributed generation capacity of the line, S L1 , S L2 They are the maximum loads that need to be transferred when the outgoing line of the two 110KV substations fails.

[0138] The multiple alternative planning schemes all meet the following constraints: line flow constraints, node voltage constraints, line current carrying capacity constraints, SOP capacity configuration constraints, distributed power output constraints, and reliability constraints;

[0139] The line power flow constraint is:

[0140]

[0141] Where P i and Q i are the active and reactive injection amounts of node i respectively; j∈i is all nodes directly connected to node i; G ij and B ij are the real and imaginary parts of the node admittance matrix respectively; θ ij is the phase angle difference between nodes i and j; U i is the voltage amplitude of node i;

[0142] The node voltage constraint is:

[0143] U imin <U i <U imax ;

[0144] Where U i is the voltage amplitude at node i, U iminis the minimum voltage amplitude of node i, U imax is the maximum voltage amplitude of node i;

[0145] The line current carrying capacity constraint is:

[0146]

[0147] In the formula, I b is the current on branch b; is the maximum current that branch b can carry;

[0148] The SOP capacity configuration constraints are:

[0149]

[0150] In the formula, S k is the SOP capacity at node k; is the maximum capacity of SOP allowed to be installed at node k;

[0151] The output constraint of the distributed power source is:

[0152]

[0153] In the formula, S DG,k The output of the distributed power source at node k; is the maximum output of the distributed generation allowed to pass through node k;

[0154] The reliability constraints are:

[0155]

[0156] Where SAIDI i is the average power outage time per household at node i; is the maximum value of the average power outage time per household specified at node i.

[0157] An objective function construction module is used to construct an objective function with the goal of minimizing the annual comprehensive cost of power grid construction; the objective function construction module is used to execute the step S3;

[0158] The objective function is:

[0159]

[0160] Where, C is the annual comprehensive cost; C TZ C is the investment and construction cost; YX C is the operation and maintenance cost; LOSS is the operating loss cost; C GD is the electricity purchase cost; C KKX is the reliability cost; r is the discount rate; n is the depreciation period; ξ1 is the investment cost per unit length of overhead line; I is the set of overhead lines; L i is the length of the i-th overhead line; ξ 2 is the investment cost of cable line per unit length; J is the cable line set; D j is the length of the jth cable line; ξ 3 is the unit capacity SOP investment cost; K is the network SOP switch set; S k is the planned design capacity of the kth SOP; L is the network energy storage set; ξ 4 E is the energy storage investment cost per unit capacity; l Design capacity for the lth energy storage plan; ε 1 is the overhead line operation and maintenance conversion factor; ε 2 is the operation and maintenance conversion factor of the cable line; ε 3 is the operation and maintenance conversion factor of SOP; 4 is the operation and maintenance conversion coefficient of energy storage; η is the unit electricity price; M is the set of all lines; P m is the network loss of the mth line; N is the set of network substations; G n is the active power of the nth substation node; O is the set of network load nodes; μ is the unit power shortage cost; E o is the power shortage of the oth load node.

[0161] The optimization module is used to select the scheme with the minimum annual comprehensive cost of power grid construction from the alternative planning schemes through the objective function; the optimization module is used to execute the step S4.

[0162] In specific implementation, the above modules can be implemented as independent entities, or can be arbitrarily combined to be implemented as the same entity or several entities.

[0163] An embodiment of the present invention also provides a differentiated flexible grid planning device based on high and medium voltage coordination, the device comprising a processor and a memory, the memory storing a computer program, and the processor being configured to run the computer program to execute the steps in the above-mentioned differentiated flexible grid planning method based on high and medium voltage coordination.

[0164] In addition, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the above-mentioned differentiated flexible grid planning method based on high and medium voltage coordination is implemented.

[0165] Generally speaking, the computer instructions for implementing the method of the present invention may be carried in any combination of one or more computer-readable storage media. Non-transitory computer-readable storage media may include any computer-readable media, except for the signal itself that is temporarily propagating.

[0166] Computer-readable storage media, for example, may be, but are not limited to, electrical, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or devices, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection with one or more conductors, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with a system, device or device for executing instructions.

[0167] One or more programming languages ​​or their combinations can be used to write computer program codes for performing the operation of the present invention. These programming languages ​​include object-oriented programming languages, such as Java, Smalltalk, C++, and also include conventional procedural programming languages, such as C language or similar programming languages. In particular, Python language suitable for neural network calculations and platform frameworks based on TensorFlow, PyTorch, etc. can be used. The program code can be executed completely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on the remote computer, or completely on the remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through various types of networks, including a local area network (LAN) or a wide area network (WAN), or an Internet connection is performed through an Internet service provider.

[0168] Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A differentiated flexible grid planning method based on high and medium voltage coordination is characterized by: The planning method includes: S1. Determine whether the area to be planned is an urban scene or a rural scene. If the area to be planned is an urban scene, select a first grid structure; if the area to be planned is a rural scene, select a second grid structure; S2. Based on the selected grid structure and combined with the planning requirements of the distribution network, construct multiple alternative planning schemes; S3, constructing an objective function with the goal of minimizing the annual comprehensive cost of power grid construction; S4. Through the objective function, select the plan with the lowest annual comprehensive cost of power grid construction from the alternative planning plans.

2. The differentiated flexible grid planning method based on high and medium voltage coordination according to claim 1 is characterized in that: In the first grid structure, the high voltage layer adopts a ring network, double radiation or single radiation structure, and the medium voltage trunk layer adopts inter-station connection; In the second grid structure, the high voltage layer adopts a ring network or a double radial structure, and the medium voltage trunk layer adopts the same station connection or a single radial connection.

3. The differentiated flexible grid planning method based on high and medium voltage coordination according to claim 1 is characterized in that: The first grid structure includes a high voltage layer, a medium voltage trunk layer, and a medium voltage access layer; The high-voltage layer of the first grid structure includes two 220KV substations and two 110KV substations. The two 220KV substations are used to receive power from the ultra-high voltage grid and reduce the power from the ultra-high voltage grid to the 110KV level. The two 110KV substations are used to receive power output from the two 220KV substations and reduce the power output from the two 220KV substations to the medium voltage level. The outgoing line sides of the two 110KV substations form two sets of double radial connections respectively. The medium-voltage trunk layer of the first grid structure includes two groups of wiring, the two groups of wiring are connected in series between the two 110KV substations to form a ring network structure, each group of wiring includes a dual-port SOP and a plurality of ring network cabinets, and at least one ring network cabinet is connected in series between the port of the dual-port SOP and the outgoing line side of the 110KV substation through a medium-voltage feeder; The medium voltage access layer of the first grid structure includes a DC microgrid, an AC microgrid, photovoltaics, and energy storage connected to the medium voltage backbone layer; The second grid structure includes a high voltage layer, a medium voltage trunk layer, and a medium voltage access layer; The high-voltage distribution network of the second grid structure includes two 220KV substations and two 110KV substations. The two 220KV substations are used to receive power from the ultra-high voltage grid and reduce the power from the ultra-high voltage grid to the 110KV level. The two 110KV substations are used to receive power output from the two 220KV substations and reduce the power output from the two 220KV substations to the medium voltage level. The outgoing line sides of the two 110KV substations form two sets of double radial connections respectively. The medium-voltage trunk layer of the second grid structure includes two groups of wiring, and both ends of each group of wiring are connected to the double-radial wiring on the outgoing line side of a 110KV substation to form a ring network structure. The two ring network structures are connected through a dual-port SOP. Each group of wiring includes a tie switch and a plurality of circuit breakers. At least one circuit breaker is connected in series between the port of the tie switch and the outgoing line side of the 110KV substation through a medium-voltage feeder. The medium voltage access layer of the second grid structure includes photovoltaic, energy storage, wind power, electric vehicle charging load, and AC / DC load connected to the medium voltage trunk layer.

4. The differentiated flexible grid planning method based on high and medium voltage coordination according to claim 3 is characterized in that: In the first grid structure, the medium voltage feeder adopts a cable line, and the conductor cross-section of the medium voltage trunk layer line is not less than 300mm 2 , the conductor section of the medium voltage access layer line shall not be less than 150mm 2 , the number of ring main units connected in series in a single group of wiring in the medium voltage trunk layer shall not exceed 6, the ring main unit adopts 2-circuit cable incoming line and 3-4-circuit cable outgoing line, and the incoming and outgoing lines of the ring main unit are equipped with circuit breakers; In the second grid structure, the medium voltage feeder adopts an overhead line, and the conductor cross-section of the medium voltage trunk layer line is not less than 240mm 2 , the conductor cross-section of the medium voltage access layer line shall not be less than 120mm 2 The single-group wiring in the medium-voltage trunk layer is divided into N sections by circuit breakers, N≤5, and the number of contact points of the single-group wiring in the medium-voltage trunk layer does not exceed 3.

5. The differentiated flexible grid planning method based on high and medium voltage coordination according to any one of claims 1 to 4, characterized in that: In step S3, the objective function is: Where, C is the annual comprehensive cost; C TZ C is the investment and construction cost; YX C is the operation and maintenance cost; LOSS is the operating loss cost; C GD is the electricity purchase cost; C KKX is the reliability cost; r is the discount rate; n is the depreciation period; ξ1 is the investment cost per unit length of overhead line; I is the overhead line set; L i is the length of the ith overhead line; ξ2 is the investment cost of the cable line per unit length; J is the set of cable lines; D j is the length of the jth cable line; ξ3 is the unit capacity SOP investment cost; K is the network SOP switch set; S k is the planned design capacity of the kth SOP; L is the network energy storage set; ξ4 is the unit capacity energy storage investment cost; E l Plan and design capacity for the lth energy storage; ε1 is the operation and maintenance conversion factor of overhead lines; ε2 is the operation and maintenance conversion factor of the cable line; ε3 is the operation and maintenance conversion factor of the SOP; ε4 is the operation and maintenance conversion factor of the energy storage; η is the unit electricity price; M is the set of all lines; P m is the network loss of the mth line; N is the set of network substations; G n is the active power of the nth substation node; O is the set of network load nodes; μ is the unit power shortage cost; E o is the power shortage of the oth load node.

6. The differentiated flexible grid planning method based on high and medium voltage coordination according to claim 5 is characterized in that: If the first grid structure is selected in step S1, the SOP capacity of the plurality of alternative planning schemes meets the following conditions: In the formula, S SOP is the capacity of the dual-port SOP, S Z,SOP is the minimum capacity of the dual-port SOP under normal operation, S G,SOP is the minimum capacity of the dual-port SOP under fault operation, ΔS L is the maximum load difference of the flexible interconnection line, S DG，L is the excess distributed generation capacity of the line, S L1 , S L2 They are the maximum loads that need to be transferred when two lines on the outgoing side of two 110KV substations fail; If the second grid structure is selected in step S1, the SOP capacity of the plurality of alternative planning schemes meets the following conditions: In the formula, S SOP is the capacity of the dual-port SOP, S Z,SOP is the minimum capacity of the dual-port SOP under normal operation, S G,SOP is the minimum capacity of the dual-port SOP under fault operation, ΔS L is the maximum load difference of the flexible interconnection line, S DG，L is the excess distributed generation capacity of the line, S L1 , S L2 They are the maximum loads that need to be transferred when the outgoing line of the two 110KV substations fails.

7. The differentiated flexible grid planning method based on high and medium voltage coordination according to claim 6 is characterized in that: The multiple alternative planning schemes meet the following constraints: line flow constraints, node voltage constraints, line current carrying capacity constraints, SOP capacity configuration constraints, distributed power output constraints, and reliability constraints; The line power flow constraint is: Where P i and Q i are the active and reactive injection amounts of node i respectively; j∈i is all nodes directly connected to node i; G ij and B ij are the real and imaginary parts of the node admittance matrix respectively; θ ij is the phase angle difference between nodes i and j; U i is the voltage amplitude of node i; The node voltage constraint is: IN imin <In i <In imax ; Where U i is the voltage amplitude at node i, U imin is the minimum voltage amplitude of node i, U imax is the maximum voltage amplitude of node i; The line current carrying capacity constraint is: In the formula, I b is the current on branch b; is the maximum current that branch b can carry; The SOP capacity configuration constraints are: In the formula, S k is the SOP capacity at node k; is the maximum capacity of SOP allowed to be installed at node k; The output constraint of the distributed power source is: In the formula, S DG,k The output of the distributed power source at node k; is the maximum output of the distributed generation allowed to pass through node k; The reliability constraints are: Where SAIDI i is the average power outage time per household at node i; is the maximum value of the average power outage time per household specified at node i.

8. A differentiated flexible grid planning system based on high and medium voltage coordination is characterized by: include: A grid structure acquisition module is used to determine whether the area to be planned is a rural scene or an urban scene. If the area to be planned is an urban scene, a first grid structure is selected; if the area to be planned is a rural scene, a second grid structure is selected; An alternative scheme building module is used to build multiple alternative planning schemes based on the selected grid structure and the planning requirements of the distribution network; An objective function building module is used to build an objective function with the goal of minimizing the annual comprehensive cost of power grid construction; The optimization module is used to select the plan with the lowest annual comprehensive cost of power grid construction from the alternative planning plans through the objective function.

9. Differentiated flexible grid planning equipment based on high and medium voltage coordination, characterized in that: The method comprises a memory and a processor, wherein the memory is used to store computer program code and transmit the computer program code to the processor; The processor is used to execute the active distribution network flexible grid planning method according to any one of claims 1 to 7 according to the instructions in the computer program code.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for planning a flexible grid of an active power distribution network described in any one of claims 1 to 7 is implemented.

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