A method and system for simplifying a zonal power market point-to-point trading network

Abstract

The application relates to a kind of partition power market point-to-point transaction network simplification method and system, the method comprises: 101, the active power increment of node in power market point-to-point transaction network and the active power increment of branch are used to obtain the power transfer distribution factor of each branch in power market point-to-point transaction network;102, the power market point-to-point transaction network is simplified based on the power transfer distribution factor of each branch in the power market point-to-point transaction network;103, if the simplified power market point-to-point transaction network is connected, then output the simplified power market point-to-point transaction network, otherwise, reduce the power transfer distribution factor of each branch in the power market point-to-point transaction network and return to step 102, the technical scheme provided by the application can make various power transactions faster and more intuitive, can achieve the purpose of effective analysis, meanwhile, can also completely retain transaction information, ensure the high efficiency and accuracy of security check power flow calculation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power automation, in particular to a simplified method and system for point-to-point transaction network of zoned power market. BACKGROUND

[0002] With the continuous development of power market, power transaction is also growing. The result of power transaction must meet the grid safety constraints to be effective. At present, the point-to-point transaction network of zoned power market is used in the domestic power transaction. When the dispatching institution performs safety check, it often faces the problems of too complex grid network, large amount of calculation and difficult transaction network maintenance. Therefore, it is necessary to simplify the full network of grid used for power transaction.

[0003] At present, the commonly used grid network simplification methods include WARD equivalent method, REI equivalent method and electrical dissection method. However, the existing grid network simplification methods require clear division of internal and external regions, while power transaction is not concentrated in the same region, especially the cross-regional power transaction under the zoned market mode, which is spread throughout the grid network, and the region boundary is ambiguous, so it is difficult to clearly divide the internal and external regions. At the same time, the existing grid network simplification methods will aggregate and simplify the treatment of generators, loads and congestion lines involved in price calculation as bidding subjects, which cannot completely retain transaction information, affecting the integrity and correctness of transaction. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to make power transaction more efficient and intuitive, which can effectively analyze and simplify the maintenance of transaction network, and also can completely retain transaction information to ensure the efficiency and accuracy of safety check power flow calculation.

[0005] The purpose of the present application is achieved by using the following technical solutions:

[0006] A simplified method for point-to-point transaction network of zoned power market, the improvement lies in that the method comprises:

[0007] 101. obtaining power transfer distribution factors of each branch in the point-to-point transaction network of power market by using the active power increment of nodes and the active power increment of branches in the point-to-point transaction network of power market;

[0008] 102. simplifying the point-to-point transaction network of power market based on the power transfer distribution factors of each branch in the point-to-point transaction network of power market;

[0009] 103. if the simplified point-to-point transaction network of power market is connected, outputting the simplified point-to-point transaction network of power market, otherwise, reducing the power transfer distribution factors of each branch in the point-to-point transaction network of power market and returning to step 102.

[0010] Preferably, step 101 includes:

[0011] 1011. Determine the active power sensitivity of each node to each branch in the point-to-point trading network of the power market based on the active power increment of the nodes and the active power increment of the branches.

[0012] 1012. Determine the power transfer distribution factor of each branch in the power market point-to-point trading network based on the active power sensitivity of each node to each branch.

[0013] Furthermore, step 1011 includes:

[0014] The active power sensitivity matrix of each node to each branch in the point-to-point electricity market trading network is determined by the following formula.

[0015]

[0016] Where, N l Let be the number of branches in the peer-to-peer electricity market trading network, and n be the number of nodes in the peer-to-peer electricity market trading network. The nth node is the balancing node in the peer-to-peer electricity market trading network. For the (n-1)th node in the electricity market peer-to-peer trading network, the Nth node... l The active power sensitivity of the branch circuit. For the Nth in the peer-to-peer electricity market trading network l The active power increment of the branch, ΔP n-1 This represents the active power increment of the (n-1)th node in the peer-to-peer electricity market trading network.

[0017] Furthermore, step 1012 includes:

[0018] The power transfer distribution factor of the i-th branch in the peer-to-peer electricity market trading network is determined by the following formula.

[0019]

[0020] Among them, S i,p S represents the sensitivity of the p-th node to the i-th branch in a peer-to-peer electricity market trading network. i,q Let be the sensitivity of the q-th node to the i-th branch in the peer-to-peer electricity market trading network, where the p-th node is the generator node in the peer-to-peer electricity market trading network, and the q-th node is the load node in the peer-to-peer electricity market trading network.

[0021] Preferably, step 102 includes:

[0022] If the power transfer distribution factor of the i-th branch in the power market point-to-point transaction network is greater than a preset threshold, the i-th branch in the power market point-to-point transaction network is reserved, otherwise, the i-th branch in the power market point-to-point transaction network is removed.

[0023] Further, the preset threshold is 0.1.

[0024] Preferably, the connectivity of the simplified power market point-to-point transaction network is determined by using a depth-first search algorithm.

[0025] Preferably, the step 103 comprises:

[0026] If a generation node in the node can be connected to a load node by a branch of the simplified power market point-to-point transaction network, the power market point-to-point transaction network is connected, otherwise, the power transfer distribution factor of each branch in the power market point-to-point transaction network is reduced to 50% of the original and the step 102 is returned.

[0027] A partitioned power market point-to-point transaction network simplification system, which is improved in that the system comprises:

[0028] An acquisition unit is configured to acquire the power transfer distribution factor of each branch in the power market point-to-point transaction network by using the active power increment of the node and the active power increment of the branch in the power market point-to-point transaction network;

[0029] A simplification unit is configured to simplify the power market point-to-point transaction network based on the power transfer distribution factor of each branch in the power market point-to-point transaction network;

[0030] A judgment unit is configured to output the simplified power market point-to-point transaction network if the simplified power market point-to-point transaction network is connected, otherwise, reduce the power transfer distribution factor of each branch in the power market point-to-point transaction network and return to the simplification unit.

[0031] Preferably, the acquisition unit comprises:

[0032] A first determination module is configured to determine the active power sensitivity of each node to each branch in the power market point-to-point transaction network according to the active power increment of the node and the active power increment of the branch in the power market point-to-point transaction network;

[0033] A second determination module is configured to determine the power transfer distribution factor of each branch in the power market point-to-point transaction network according to the active power sensitivity of each node to each branch in the power market point-to-point transaction network.

[0034] Compared with the closest prior art, the present application has the beneficial effects that:​

[0035] The technical solution provided by the present application comprises the following steps: 101. obtaining power transfer distribution factors of each branch in the power market point-to-point transaction network by using the active power increment of each node and the active power increment of each branch in the power market point-to-point transaction network; 102. simplifying the power market point-to-point transaction network based on the power transfer distribution factors of each branch in the power market point-to-point transaction network; 103. if the simplified power market point-to-point transaction network is connected, outputting the simplified power market point-to-point transaction network, otherwise, reducing the power transfer distribution factors of each branch in the power market point-to-point transaction network and returning to step 102. Based on the technical solution provided by the present application, the internal and external systems do not need to be distinguished, the transaction information such as market bidding topics and transaction channels is completely reserved, and the branches irrelevant to the transaction can be directly removed in a more intuitive way; meanwhile, the power transfer distribution factor threshold can be automatically adjusted according to the iteration convergence requirement, thereby avoiding repeated adjustment and calculation of the threshold.

[0036] The present application also ensures the connectivity of the simplified transaction network by using the depth-first search algorithm, thereby avoiding manual supplement of branches and verification. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 The present application provides a partitioned power market point-to-point transaction network simplification method.

[0038] Figure 2 The present application provides a power market point-to-point transaction network model diagram.

[0039] Figure 3 The present application provides a depth-first search algorithm search sequence diagram.

[0040] Figure 4 The present application provides a partitioned power market point-to-point transaction network simplification system structure diagram. DETAILED DESCRIPTION

[0041] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0042] To make the purpose, technical solution and advantages of the embodiments of the present application more clear, the technical solution in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0043] The present embodiment provides a partitioned power market point-to-point transaction network simplification method, as shown inFigure 1 As shown, it includes:

[0044] 101. Obtain the power transfer distribution factor of each branch in the point-to-point trading network of the power market by utilizing the active power increment of the nodes and the active power increment of the branches in the point-to-point trading network of the power market.

[0045] 102. The power market peer-to-peer trading network is simplified based on the power transfer distribution factor of each branch in the power market peer-to-peer trading network;

[0046] 103. If the simplified electricity market peer-to-peer trading network is connected, output the simplified electricity market peer-to-peer trading network; otherwise, reduce the power transfer distribution factor of each branch in the electricity market peer-to-peer trading network and return to step 102.

[0047] For example, before step 101, it is also necessary to determine the nodes and lines that must be retained based on the content of point-to-point transactions in the electricity market; wherein, the content of point-to-point transactions in the electricity market includes the grid access points of the power purchaser and the power seller, as well as the electricity volume and price agreed upon by the power purchaser and the power seller.

[0048] For example, such as Figure 2 As shown, generator node G1 is in partition 1, and load node L1 is in partition 2. Generator node G1 and load node L1 enter into a point-to-point power transaction, requiring simplification of the entire network, including partition 1, partition 2, and tie lines. First, based on the content of the point-to-point power market transaction, the nodes that must be retained are generator node G1 and load node L1, and the lines that must be retained are tie line 1 and tie line 2.

[0049] Step 101 specifically includes:

[0050] 1011. Determine the active power sensitivity of each node to each branch in the point-to-point trading network of the power market based on the active power increment of the nodes and the active power increment of the branches.

[0051] For example, based on the DC power flow algorithm, the expression for active power flow is:

[0052] P ij =B ij (θ i -θ j (1)

[0053] In the above formula, i is the first node of the line, j is the last node of the line, and P ij For the active power flow at the beginning of line ij, B ij Let θ be the susceptance of line ij. i Let θ be the phase angle of the bus voltage at end i in line ij.j is the voltage phase angle of the bus at the end j of the line ij;

[0054] The power balance equation of node i is:

[0055]

[0056] In the above formula, P i is the injection power of node i, j is the end node of the line ij, and n is the number of nodes directly connected to node i;

[0057] Substituting formula (1) into formula (2) gives:

[0058]

[0059] In the above formula, is the sum of the susceptance values of all lines directly connected to the node i, and B' ij = -B ij is the negative of the susceptance value of the line ij;

[0060] B' ii and B' ij constitute the diagonal elements and non-diagonal elements in the matrix [B'], and the above formula is true for all nodes except the balancing node, so the power balance equation of the node can be expressed as:

[0061]

[0062] In the above formula, P n-1 is the active injection power of the n-1th node, B' n-1,n-1 is the susceptance between the n-1th node and the n-1th node, θ n-1 is the voltage phase angle of the n-1th node;

[0063] According to formula (1), we have:

[0064]

[0065] where H ij,i = B ij , H ij,j = -B ij , Δθ i is the voltage phase angle increment of the i th node, and Δθ j is the voltage phase angle increment of the j th node.

[0066] Therefore:

[0067] [ΔP l ] = [H] [Δθ] (6)

[0068] In the above formula, [ΔPl [ ] represents the incremental vector of active power in the branch. For the Nth in the peer-to-peer electricity market trading network l The active power increment of the branch, where [Δθ] is the increment vector of the node voltage phase angle. Δθ n-1 Let [H] be the increment of the voltage phase angle at the (n-1)th node, and let [H] be an N-row (n-1)-column matrix. Its element definition H k,i =B ij H k,j =-B ij This means that if a branch number k corresponds to start and end node numbers i and j, then the element in row k, column i of the [H] matrix is ​​equal to the susceptance H of that branch. k,i =B ij For an element in row k and column j equal to the electrical charge of that branch, take the negative sign H. k,j =-B ij The formula does not include the balancing nodes, so its dimension is n-1;

[0069] Linearizing and transforming equation (4) yields:

[0070] [Δθ]=[B'] -1 [ΔP] (7)

[0071] Substituting equation (7) into equation (6), we get:

[0072] [ΔP l ]=[H][B'] -1 [ΔP]

[0073] =[S][ΔP]

[0074] Therefore, the active power sensitivity matrix of the branches in the point-to-point electricity market trading network is determined by the following formula. Right now:,

[0075]

[0076] Where, N l Let be the number of branches in the peer-to-peer electricity market trading network, and n be the number of nodes in the peer-to-peer electricity market trading network. The nth node is the balancing node in the peer-to-peer electricity market trading network. For the (n-1)th node in the electricity market peer-to-peer trading network, the Nth node... l The sensitivity of the branch circuit, For the Nth in the peer-to-peer electricity market trading network l The active power increment of the branch, ΔP n-1an active power increment of the n-1th node in the power market point-to-point transaction network;

[0077] 1012. determining a power transfer distribution factor of each branch in the power market point-to-point transaction network according to the active power sensitivity of each node to each branch in the power market point-to-point transaction network.

[0078] The step 1012 specifically comprises:

[0079] determining the power transfer distribution factor of the ith branch in the power market point-to-point transaction network according to the following formula

[0080]

[0081] wherein S i,p is the sensitivity of the pth node to the ith branch in the power market point-to-point transaction network, S i,q is the sensitivity of the qth node to the ith branch in the power market point-to-point transaction network, the pth node is a power generation node in the power market point-to-point transaction network, and the qth node is a load node in the power market point-to-point transaction network; is a power transfer distribution factor vector of the branch,

[0082] To obtain the power transfer distribution factor of each branch in the power market point-to-point transaction network, it is also necessary to simplify the power market point-to-point transaction network based on the power transfer distribution factor of each branch in the power market point-to-point transaction network. Therefore, the step 102 comprises:

[0083] if the power transfer distribution factor of the ith branch in the power market point-to-point transaction network is greater than a preset threshold, the ith branch in the power market point-to-point transaction network is retained, otherwise, the ith branch in the power market point-to-point transaction network is removed.

[0084] The preset threshold is 0.1.

[0085] After the power market point-to-point transaction network is simplified, it is necessary to determine the connectivity of the simplified power market point-to-point transaction network. Therefore, the step 103 comprises:

[0086] if the power generation node can be connected to the load node by the branch of the simplified power market point-to-point transaction network, the power market point-to-point transaction network is connected, otherwise, the power transfer distribution factor of each branch in the power market point-to-point transaction network is reduced to 50% of the original value and the step 102 is returned.

[0087] ​The connectivity of the simplified point-to-point transaction network is determined by using a depth-first search algorithm. Figure 3 The numbers shown in the figure represent the order in which the vertices are visited by the depth-first search algorithm.

[0088] Based on the same concept as the above method, the application further provides a system for simplifying a point-to-point transaction network in a partitioned electricity market, as shown in the figure. Figure 4 The system comprises:

[0089] An obtaining unit is configured to obtain power transfer distribution factors of branches in the point-to-point transaction network in the electricity market by using active power increments of nodes and active power increments of branches in the point-to-point transaction network in the electricity market.

[0090] A simplifying unit is configured to simplify the point-to-point transaction network in the electricity market based on the power transfer distribution factors of the branches in the point-to-point transaction network in the electricity market.

[0091] A determining unit is configured to output the simplified point-to-point transaction network in the electricity market if the simplified point-to-point transaction network in the electricity market is connected, or to reduce the power transfer distribution factors of the branches in the point-to-point transaction network in the electricity market and return to the simplifying unit.

[0092] The obtaining unit specifically comprises:

[0093] A first determining module is configured to determine active power sensitivities of nodes to branches in the point-to-point transaction network in the electricity market according to active power increments of the nodes and active power increments of the branches in the point-to-point transaction network in the electricity market.

[0094] A second determining module is configured to determine the power transfer distribution factors of the branches in the point-to-point transaction network in the electricity market according to the active power sensitivities of the nodes to the branches in the point-to-point transaction network in the electricity market.

[0095] The first determining module is specifically configured to:

[0096] determine the active power sensitivity matrix of the nodes to the branches in the point-to-point transaction network in the electricity market according to the following formula

[0097]

[0098] wherein N l is the number of branches in the point-to-point transaction network in the electricity market, n is the number of nodes in the point-to-point transaction network in the electricity market, the nth node is a balanced node in the point-to-point transaction network in the electricity market, is the sensitivity of the (n-1)th node to the N l th branch in the point-to-point transaction network in the electricity market, an active power increment of an nth branch in a point-to-point transaction network of a power market l an active power increment of an nth branch in a point-to-point transaction network of a power market n-1 an active power increment of an nth-1 node in a point-to-point transaction network of a power market

[0099] The second determining module is specifically configured to:

[0100] determine a power transfer distribution factor of an ith branch in the point-to-point transaction network of the power market according to the following formula

[0101]

[0102] wherein S i,p is a sensitivity of a pth node to the ith branch in the point-to-point transaction network of the power market, S i,q is a sensitivity of a qth node to the ith branch in the point-to-point transaction network of the power market, the pth node is a power generation node in the point-to-point transaction network of the power market, and the qth node is a load node in the point-to-point transaction network of the power market.

[0103] The simplifying unit is specifically configured to:

[0104] if the power transfer distribution factor of the ith branch in the point-to-point transaction network of the power market is greater than a preset threshold, retain the ith branch in the point-to-point transaction network of the power market, otherwise, eliminate the ith branch in the point-to-point transaction network of the power market.

[0105] The preset threshold is 0.1.

[0106] The judging unit is specifically configured to:

[0107] use a depth-first search algorithm to judge connectivity of the simplified point-to-point transaction network.

[0108] if the power generation node can be connected to the load node by the branch of the simplified point-to-point transaction network of the power market, the point-to-point transaction network of the power market is connected, otherwise, reduce the power transfer distribution factor of each branch in the point-to-point transaction network of the power market to 50% of the original value and return to the simplifying unit.

[0109] Those skilled in the art will understand that embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) having computer-usable program code embodied therein.​

[0110] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0111] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0112] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0113] Finally, it should be noted that the above-mentioned embodiments are merely intended for describing the technical solutions of the present application, but not for limiting thereof. Although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalent replaced without departing from the spirit and scope of the present application, and any modification or equivalent replacement should be covered in the protection scope of the claims of the present application.

Claims

1. A method for simplifying a zonal electricity market point-to-point transaction network, characterized by, The method comprises: (101) obtaining power transfer distribution factors of each branch in the power market point-to-point transaction network by using the active power increment of each node and the active power increment of each branch in the power market point-to-point transaction network; (102) simplifying the power market point-to-point transaction network based on the power transfer distribution factors of each branch in the power market point-to-point transaction network; (103) if the simplified power market point-to-point transaction network is connected, outputting the simplified power market point-to-point transaction network, otherwise, reducing the power transfer distribution factors of each branch in the power market point-to-point transaction network and returning to step 102; The step 101 comprises: (1011) determining the active power sensitivity of each node to each branch in the power market point-to-point transaction network according to the active power increment of each node and the active power increment of each branch in the power market point-to-point transaction network; (1012) determining the power transfer distribution factors of each branch in the power market point-to-point transaction network according to the active power sensitivity of each node to each branch in the power market point-to-point transaction network; The step 1011 comprises: determining the active power sensitivity matrix of each node to each branch in the power market point-to-point transaction network according to the following formula ： wherein N l is the number of branches in the power market point-to-point transaction network, n is the number of nodes in the power market point-to-point transaction network, the nth node is a balancing node in the power market point-to-point transaction network, is the active power increment of the nth branch in the power market point-to-point transaction network, l is the active power sensitivity of the nth branch in the power market point-to-point transaction network, is the active power increment of the nth branch in the power market point-to-point transaction network, l is the active power increment of the nth branch in the power market point-to-point transaction network, n-1 is the active power increment of the nth branch in the power market point-to-point transaction network, The step 1012 comprises: The power transfer distribution factor of the i-th branch in a power market point-to-point transaction network is determined by the following formula ; wherein S i ,p is the sensitivity of the pth node to the ith branch in the power market point-to-point transaction network, S i ,q is the sensitivity of the qth node to the ith branch in the power market point-to-point transaction network, the pth node is a power generation node in the power market point-to-point transaction network, and the qth node is a load node in the power market point-to-point transaction network. Step 102 includes: if the power transfer distribution factor of the i-th branch in the peer-to-peer electricity market trading network is... If the value exceeds the preset threshold, the i-th branch in the peer-to-peer electricity market trading network is retained; otherwise, the i-th branch in the peer-to-peer electricity market trading network is removed. The step 103 comprises: if a power generation node in the node can be connected to a load node by a branch of the simplified power market point-to-point transaction network, the power market point-to-point transaction network is connected, otherwise, reducing a preset threshold of the power transfer distribution factors of each branch in the power market point-to-point transaction network to 50% of the original and returning to step 102.

2. The method of claim 1, wherein, Before the step 101, the method further comprises: determining the nodes and lines that must be retained according to the content of the power market point-to-point transaction.

3. The method of claim 1, wherein, The preset threshold is 0.

1.

4. The method of claim 1, wherein, The connectivity of the simplified point-to-point transaction network is determined by using a depth-first search algorithm.

5. A system for simplifying a zonal electricity market point-to-point trading network for implementing a method for simplifying a zonal electricity market point-to-point trading network according to any one of claims 1 to 4, characterized in that, The system comprises: an obtaining unit, configured to obtain power transfer distribution factors of each branch in the power market point-to-point transaction network by using the active power increment of each node and the active power increment of each branch in the power market point-to-point transaction network; a simplifying unit, configured to simplify the power market point-to-point transaction network based on the power transfer distribution factors of each branch in the power market point-to-point transaction network; a judging unit, configured to if the simplified power market point-to-point transaction network is connected, output the simplified power market point-to-point transaction network, otherwise, reduce the power transfer distribution factors of each branch in the power market point-to-point transaction network and return to the simplifying unit; The obtaining unit comprises: a first determining module, configured to determine the active power sensitivity of each node to each branch in the power market point-to-point transaction network according to the active power increment of each node and the active power increment of each branch in the power market point-to-point transaction network; a second determining module, configured to determine the power transfer distribution factors of each branch in the power market point-to-point transaction network according to the active power sensitivity of each node to each branch in the power market point-to-point transaction network; The first determination module is specifically configured to determine the active power sensitivity matrix of each branch with respect to each node in the power market point-to-point transaction network according to the following formula : wherein N l is the number of branches in the power market point-to-point transaction network, n is the number of nodes in the power market point-to-point transaction network, the nth node is a balancing node in the power market point-to-point transaction network, is the active power increment of the nth branch in the power market point-to-point transaction network, l is the active power sensitivity of the nth branch in the power market point-to-point transaction network, is the active power increment of the nth branch in the power market point-to-point transaction network, l is the active power increment of the nth branch in the power market point-to-point transaction network, n-1 is the active power increment of the nth branch in the power market point-to-point transaction network, The second determining module is specifically configured to determine the power transfer distribution factor of the ith branch in the power market point-to-point transaction network according to the following formula ; wherein S i ,p is the sensitivity of the pth node to the ith branch in the power market point-to-point transaction network, S i ,q is the sensitivity of the qth node to the ith branch in the power market point-to-point transaction network, the pth node is a power generation node in the power market point-to-point transaction network, and the qth node is a load node in the power market point-to-point transaction network. The simplification unit is specifically configured to: if the power transfer distribution factor of the i-th branch in the power market point-to-point transaction network is greater than a preset threshold, retaining the i-th branch in the power market point-to-point transaction network; otherwise, eliminating the i-th branch in the power market point-to-point transaction network. The simplification unit is specifically configured to: if the power transfer distribution factor of the i-th branch in the power market point-to-point transaction network is greater than a preset threshold, retaining the i-th branch in the power market point-to-point transaction network; otherwise, eliminating the i-th branch in the power market point-to-point transaction network. The judging unit is specifically configured to: if a power generation node in the nodes can be connected to a load node by a branch of the simplified power market point-to-point transaction network, the power market point-to-point transaction network is connected, otherwise, a preset threshold of a power transfer distribution factor of each branch in the power market point-to-point transaction network is reduced to 50% of the original, and the simplifying unit is called.

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