A flexible ac-dc conditioning device configuration method and system

Abstract

The application discloses a flexible AC / DC regulating device configuration method and system, which constructs a multi-level power transmission channel comprehensive evaluation system and a configuration scheme set for improving power transmission channel transmission capacity, calculates a bottom index value corresponding to each configuration scheme under the multi-level power transmission channel comprehensive evaluation system, and then calculates and obtains the weight of each bottom index based on the judgment matrix based on the analytic hierarchy process, so as to perform superiority evaluation on different configuration schemes, and select the configuration scheme with the best superiority evaluation result as the flexible AC / DC regulating device configuration scheme. The method can obtain the most optimal configuration scheme through multi-dimensional evaluation related to static stability, dynamic stability and economic benefit, so that the power transmission channel transmission capacity can be improved.

Description

Technical Field

[0001] This invention belongs to the field of power system evaluation technology, and in particular relates to a method and system for configuring a flexible AC / DC regulating device. Background Technology

[0002] With rapid economic and social development, electricity demand in load centers is experiencing massive growth. However, many load centers are concentrated in urban core areas, such as government agencies, hospitals, and schools. These areas face limited land resources, making it impossible to meet the continuously increasing power demand simply by adding more transmission lines. Against this backdrop, improving the transmission capacity of existing transmission channels has become a crucial task in ensuring the security and stability of power supply.

[0003] Flexible AC transmission technology and flexible AC / DC power flow regulation devices, as important components of modern power systems, demonstrate significant advantages in enhancing the transmission capacity of transmission channels. Through flexible power flow regulation and power allocation optimization, flexible devices can improve the static stability and dynamic response capabilities of the power grid, alleviating transmission bottlenecks. Furthermore, these devices can improve the overall system operating efficiency by reducing power losses and optimizing the economics of the transmission network. Therefore, how to scientifically configure these devices to enhance the capacity of transmission sections has become a key area of ​​current research.

[0004] Currently, research on flexible AC / DC power flow regulation devices, both domestically and internationally, mainly focuses on their planning and optimization methods. However, existing research largely focuses on optimizing single indicators (such as static stability or economic efficiency), lacking a systematic evaluation of multi-dimensional comprehensive performance. To comprehensively improve the capacity of power transmission channels, it is urgent to establish a planning method based on a comprehensive evaluation of static stability, dynamic stability, and economic benefits, thereby promoting the further development and application of flexible device configuration technology. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention proposes a method and system for configuring a flexible AC / DC regulating device.

[0006] The technical solution of the present invention is as follows:

[0007] A method for configuring a flexible AC / DC regulating device, wherein the flexible AC / DC regulating device is configured in the transmission channel of a target power grid to improve the transmission capacity of the transmission section, comprising:

[0008] A multi-level comprehensive evaluation system for power transmission channels is constructed to improve the transmission capacity of power transmission channels. The first layer of the multi-level comprehensive evaluation system is a top-level indicator for evaluating the comprehensive performance of the target grid. The second layer includes a first intermediate-level indicator for evaluating the static stability of the target grid, a second intermediate-level indicator for evaluating the dynamic stability of the target grid, and a third intermediate-level indicator for evaluating the economic benefits of the target grid. The third layer includes the bottom-level indicators under each intermediate-level indicator in the second layer.

[0009] Construct a set of configuration schemes that include several configuration schemes of flexible AC / DC regulating devices;

[0010] Under the comprehensive evaluation system of the multi-layer power transmission channel, the underlying index value corresponding to each configuration scheme in the configuration scheme set is calculated based on the simulation operation data of each configuration scheme.

[0011] Based on the analytic hierarchy process, a judgment matrix is ​​constructed for each level, and the weight of each bottom-level indicator is calculated based on the judgment matrix.

[0012] Based on the underlying index values ​​and weights of each configuration scheme, the superiority of the different configuration schemes is evaluated, and the configuration scheme with the best superiority evaluation result is selected as the configuration scheme of the flexible AC / DC regulating device.

[0013] Furthermore, the underlying indicators under the first middle-level indicators include the cross-sectional transmission capacity improvement ratio, the line load margin improvement rate, and the power flow balance improvement rate.

[0014] The underlying indicators under the second middle-level indicators include the reduction rate of transient maximum power angle difference, the improvement rate of transient voltage recovery speed, the improvement rate of transient frequency recovery speed, and the reduction rate of short-circuit current peak value.

[0015] The underlying indicators under the third middle-level indicator include investment costs.

[0016] Furthermore, the expression for the cross-sectional transmission capacity enhancement ratio is:

[0017]

[0018] In the formula, R dmsdrl,i P represents the cross-sectional transmission capacity improvement ratio under the i-th configuration scheme; 2,i P1 represents the transmission capacity of the transmission section under the i-th configuration scheme; P1 represents the transmission capacity of the transmission section before the flexible AC / DC regulating device is configured; m represents the total number of configuration schemes.

[0019] The expression for the line load margin improvement rate is:

[0020]

[0021] In the formula, R xlfzyd,k,i L represents the line load margin improvement rate on the k-th line of the transmission section under the i-th configuration scheme; 1,k,i L 2,k,i P represents the load margin of the k-th line of the transmission section in the i-th configuration scheme before and after the installation of the flexible AC / DC regulating device; lim1,k,i P lim2,k,i P represents the active power transmission limit of the k-th line of the transmission section in the i-th configuration scheme before and after the flexible AC / DC regulating device is configured; c1,k,i P c2,k,i These represent the active power transmitted by the k-th line of the transmission section in the i-th configuration scheme before and after the flexible AC / DC regulating device is configured, respectively; w is the total number of transmission channels in the transmission section.

[0022] The expression for the improvement rate of power flow balance is:

[0023]

[0024] In the formula, R cljhd,i H represents the power flow balance improvement rate under the i-th configuration scheme; PW H represents the weighted power flow entropy; pw1,i H pw2,i These are the weighted power flow entropies before and after configuring the flexible AC / DC regulator in the i-th configuration scheme, respectively; α is a constant coefficient; ω l Load factor μ l The corresponding weighting coefficient; P(l) is the load factor μ l The corresponding probability coefficient; n is the total number of transmission channels in the target grid;

[0025] The expression for the reduction rate of the transient maximum power angle difference is:

[0026]

[0027] In the formula, R ztzdgjc,i δ represents the reduction rate of the transient maximum power angle difference under the i-th configuration scheme; max1,i δ max2,i These represent the maximum transient power angle difference of the i-th configuration scheme before and after configuring the flexible AC / DC regulator;

[0028] The expression for the transient voltage recovery rate improvement is:

[0029]

[0030] In the formula, R ztdyhfsd,i T represents the improvement rate of transient voltage recovery speed under the i-th configuration scheme;ur1,i T ur2,i These are the transient voltage recovery rates of the i-th candidate configuration scheme before and after configuring the flexible AC / DC regulator, i.e., the time required from the start of the fault until the voltage recovers to 90% of the steady-state value before the fault;

[0031] The expression for the transient frequency recovery rate improvement is:

[0032]

[0033] In the formula, R ztplhfsd,i T represents the improvement rate of transient frequency recovery speed under the i-th configuration scheme; fr1,i T fr2,i These are the transient frequency recovery speeds of the i-th configuration scheme before and after configuring the flexible AC / DC regulator, i.e., the time required for the frequency to recover to the steady-state value before the fault from the time of the fault.

[0034] The expression for the short-circuit current peak reduction rate is:

[0035]

[0036] In the formula, R dldlfz,i I represents the rate of reduction of peak short-circuit current under the i-th configuration scheme; max1,i I max2,i These are the peak short-circuit current values ​​before and after configuring the flexible AC / DC regulator for the i-th configuration scheme.

[0037] The expression for the investment cost is:

[0038] C tz,i =C dw,i ·S all,i i = 1, 2, ..., m

[0039] In the formula, C tz,i The investment cost of the i-th configuration option; C dw,i S represents the unit capacity configuration cost under the i-th configuration scheme; all,i Let represent the total capacity of the flexible AC / DC regulating device configured under the i-th configuration scheme.

[0040] Furthermore, the different configuration schemes in the configuration scheme set have different configuration locations, and the configuration scheme set is represented as follows:

[0041] W = (w1, w2, ..., w i ,...,w m )

[0042] In the formula, W represents the set of configuration schemes; w1, w2, ... w i ,…wm These are the 1st, 2nd, ..., ith, ..., mth configuration schemes, where m is the total number of configuration schemes.

[0043] Furthermore, the specific steps for constructing judgment matrices for each level based on the analytic hierarchy process (AHP), and calculating the weight of each bottom-level indicator based on the judgment matrices, include:

[0044] Based on the analytic hierarchy process (AHP), construct judgment matrix B:

[0045]

[0046] In the formula, b pq For mid-level or low-level indicators x p And mid-level or bottom-level indicators x q A scale for the relative importance between them, b pq =f(x) p ,x q When p = q, b pq =1; p≠q, b pq =1 / b qp , b∈[1,Q], q∈[1,Q]; f(x p ,x q ) is x p and x q Between scaling functions;

[0047] Perform a consistency check on the constructed judgment matrix B;

[0048] Calculate the largest eigenvalue and its corresponding eigenvector of the judgment matrix B, and then normalize the eigenvector to obtain the weight vector Z.

[0049] Z = (z1, z2, ..., z d ,…,z Q )

[0050] In the formula, z1, z2, ... z d ,…z Q These are the weights of the 1st, 2nd, ..., dth, ..., Qth intermediate or bottom-level indicators, respectively.

[0051] Furthermore, the specific method for evaluating the superiority of the different configuration schemes includes:

[0052] Based on the sector radar chart method, a sector radar chart is drawn for each configuration scheme. The expression for the representative value of the sector radar chart in the i-th configuration scheme is:

[0053]

[0054] Where, αd,i The included angle is a sector, α d,i This represents the included angle corresponding to the d-th mid-level or bottom-level indicator in the i-th configuration scheme; z d,i This represents the weight coefficient corresponding to the d-th mid-level or bottom-level indicator in the i-th configuration scheme; x d,i Let x be the radius of the sector. d,i S represents the normalized value of the d-th mid-level or bottom-level metric in the i-th configuration scheme; i S is the sum of the areas of the sectors. i This represents the overall level of the top-level or mid-level indicators under the i-th configuration scheme.

[0055] Furthermore, the specific steps for selecting the configuration scheme with the best superiority evaluation result as the configuration scheme for the flexible AC / DC regulating device include:

[0056] For each configuration scheme, the sum of the sector areas in the corresponding sector radar chart is sorted in descending order to form the resulting matrix S, where S = (S sum,1 ,S sum,2 ,...S sum,i ,...S sum,m In the formula, S sum,1 ,S sum,2 ,...S sum,i ,...S sum,m These are the superiority evaluation results of the 1st, 2nd, ..., i-th, ..., m-th configuration schemes, i.e., the top-level index values, and S is... sum,1 The corresponding configuration scheme serves as the configuration scheme for the flexible AC / DC regulating device.

[0057] A flexible AC / DC regulating device configuration system is disclosed, wherein the flexible AC / DC regulating device is configured in the transmission channel of the target power grid to improve the transmission capacity of the transmission section. The system includes a system construction module, an aggregate construction module, an index calculation module, a hierarchical analysis module, and a superiority evaluation module.

[0058] The system construction module is used to construct a multi-level comprehensive evaluation system for power transmission channels aimed at improving the transmission capacity of power transmission channels. The first layer of the multi-level comprehensive evaluation system is a top-level indicator for evaluating the comprehensive performance of the target grid. The second layer includes a first intermediate-level indicator for evaluating the static stability of the target grid, a second intermediate-level indicator for evaluating the dynamic stability of the target grid, and a third intermediate-level indicator for evaluating the economic benefits of the target grid. The third layer includes the bottom-level indicators under each intermediate-level indicator in the second layer.

[0059] The set construction module is used to construct a set of configuration schemes that includes several configuration schemes of flexible AC / DC regulating devices;

[0060] The index calculation module is used to calculate the underlying index value corresponding to each configuration scheme in the configuration scheme set based on the simulation operation data of each configuration scheme under the comprehensive evaluation system of the multi-layer power transmission channel.

[0061] The hierarchical analysis module is used to construct judgment matrices for each level based on the hierarchical analysis method, and to calculate and obtain the weight of each bottom-level indicator based on the judgment matrices.

[0062] The superiority evaluation module is used to evaluate the superiority of different configuration schemes based on the underlying index values ​​and weights of each underlying index corresponding to each configuration scheme, and select the configuration scheme with the best superiority evaluation result as the configuration scheme of the flexible AC / DC regulating device.

[0063] An electronic device includes a memory and a processor, the memory storing a computer program, the processor being configured to invoke and run the computer program stored in the memory to perform the method as described in any of the preceding methods.

[0064] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method described in any of the preceding claims.

[0065] Compared with the prior art, the present invention has the following beneficial effects:

[0066] This invention proposes a method and system for configuring flexible AC / DC regulating devices. The method constructs a multi-level comprehensive evaluation system for power transmission channels and a set of configuration schemes to enhance transmission capacity. Within this multi-level evaluation system, the underlying index values ​​for each configuration scheme are calculated. Then, based on the analytic hierarchy process (AHP) and the judgment matrix, the weights of each underlying index are calculated. This allows for a superiority evaluation of different configuration schemes, and the scheme with the best evaluation result is selected as the flexible AC / DC regulating device configuration. Through multi-dimensional evaluation related to static stability, dynamic stability, and economic benefits, this method can obtain the optimal overall configuration scheme, thereby comprehensively improving the transmission capacity of power transmission channels. Attached Figure Description

[0067] Figure 1 This is a flowchart illustrating the configuration method of the flexible AC / DC regulating device in the embodiment;

[0068] Figure 2 This is a schematic diagram of the hierarchical structure of the comprehensive evaluation system proposed in the embodiment;

[0069] Figure 3 This is a schematic diagram of the sector radar diagram in the embodiment. Detailed Implementation

[0070] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. After reading this invention, any modifications of the invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0071] Example 1:

[0072] This invention provides a method for configuring a flexible AC / DC regulating device, wherein the flexible AC / DC regulating device is configured in the transmission channel of the target power grid to improve the transmission capacity of the transmission section, such as... Figure 1 As shown, the method includes the following specific steps:

[0073] S1. Construct a multi-level comprehensive evaluation system for power transmission channels aimed at improving the transmission capacity of power transmission channels. The first level of the multi-level comprehensive evaluation system for power transmission channels is the top-level indicator used to evaluate the comprehensive performance of the target grid. The second level includes the first intermediate-level indicator used to evaluate the static stability of the target grid, the second intermediate-level indicator used to evaluate the dynamic stability of the target grid, and the third intermediate-level indicator used to evaluate the economic benefits of the target grid. The third level includes the bottom-level indicators under each intermediate-level indicator in the second level.

[0074] S2. Construct a set of configuration schemes that includes several configuration schemes of flexible AC / DC regulating devices;

[0075] S3. Under the comprehensive evaluation system of multi-layer power transmission channels, calculate the underlying index value corresponding to each configuration scheme in the configuration scheme set based on the simulation operation data of each configuration scheme.

[0076] S4. Based on the analytic hierarchy process, construct the judgment matrix for each level, and calculate the weight of each bottom-level indicator based on the judgment matrix.

[0077] S5. Based on the underlying index values ​​and weights of each configuration scheme, evaluate the superiority of different configuration schemes and select the configuration scheme with the best superiority evaluation result as the configuration scheme of the flexible AC / DC regulating device.

[0078] Example 2:

[0079] This embodiment is further designed based on Embodiment 1, as follows: Figure 2 As shown, the underlying indicators under the first middle-level indicator in this example include the cross-sectional transmission capacity improvement ratio, the line load margin improvement rate, and the power flow balance improvement rate.

[0080] The underlying indicators under the second middle-level indicators include the reduction rate of transient maximum power angle difference, the improvement rate of transient voltage recovery speed, the improvement rate of transient frequency recovery speed, and the reduction rate of short-circuit current peak value.

[0081] The underlying indicators under the third middle-level indicators include investment costs.

[0082] Example 3:

[0083] This embodiment, based on Embodiment 2, is further designed in that the expression for the inter-plane transmission capacity enhancement ratio is as follows:

[0084]

[0085] In the formula, R dmsdrl,i P represents the cross-sectional transmission capacity improvement ratio under the i-th configuration scheme; 2,i P1 represents the transmission capacity of the transmission section under the i-th configuration scheme; P1 represents the transmission capacity of the transmission section before the flexible AC / DC regulating device is configured; m represents the total number of configuration schemes.

[0086] The expression for the line load margin improvement rate is:

[0087]

[0088] In the formula, R xlfzyd,k,i L represents the line load margin improvement rate on the k-th line of the transmission section under the i-th configuration scheme; 1,k,i L 2,k,i P represents the load margin of the k-th line of the transmission section in the i-th configuration scheme before and after the installation of the flexible AC / DC regulating device; lim1,k,i P lim2,k,i P represents the active power transmission limit of the k-th line of the transmission section in the i-th configuration scheme before and after the flexible AC / DC regulating device is configured; c1,k,i P c2,k,i These represent the active power transmitted by the k-th line of the transmission section in the i-th configuration scheme before and after the flexible AC / DC regulating device is configured, respectively; w is the total number of transmission channels in the transmission section.

[0089] The expression for the improvement rate of power flow balance is:

[0090]

[0091] In the formula, R cljhd,i H represents the power flow balance improvement rate under the i-th configuration scheme; PW H represents the weighted power flow entropy; pw1,i H pw2,i These are the weighted power flow entropies before and after configuring the flexible AC / DC regulator in the i-th configuration scheme, respectively; α is a constant coefficient; ω l Load factor μ l The corresponding weighting coefficient; P(l) is the load factor μ lThe corresponding probability coefficient; n is the total number of transmission channels in the target grid;

[0092] The expression for the rate of decrease of the transient maximum power angle difference is:

[0093]

[0094] In the formula, R ztzdgjc,i δ represents the reduction rate of the transient maximum power angle difference under the i-th configuration scheme; max1,i δ max2,i These represent the maximum transient power angle difference of the i-th configuration scheme before and after configuring the flexible AC / DC regulator;

[0095] The expression for the transient voltage recovery rate improvement is:

[0096]

[0097] In the formula, R ztdyhfsd,i T represents the improvement rate of transient voltage recovery speed under the i-th configuration scheme; ur1,i T ur2,i These are the transient voltage recovery rates of the i-th candidate configuration scheme before and after configuring the flexible AC / DC regulator, i.e., the time required from the start of the fault until the voltage recovers to 90% of the steady-state value before the fault;

[0098] The expression for the transient frequency recovery rate improvement is:

[0099]

[0100] In the formula, R ztplhfsd,i T represents the improvement rate of transient frequency recovery speed under the i-th configuration scheme; fr1,i T fr2,i These are the transient frequency recovery speeds of the i-th configuration scheme before and after configuring the flexible AC / DC regulator, i.e., the time required for the frequency to recover to the steady-state value before the fault from the time of the fault.

[0101] The expression for the rate of reduction of peak short-circuit current is:

[0102]

[0103] In the formula, R dldlfz,i I represents the rate of reduction of peak short-circuit current under the i-th configuration scheme; max1,i I max2,i These are the peak short-circuit current values ​​before and after configuring the flexible AC / DC regulator for the i-th configuration scheme.

[0104] The expression for investment costs is:

[0105] Ctz,i =C dw,i ·S all,i i = 1, 2, ..., m

[0106] In the formula, C tz,i The investment cost of the i-th configuration option; C dw,i S represents the unit capacity configuration cost under the i-th configuration scheme; all,i Let represent the total capacity of the flexible AC / DC regulating device configured under the i-th configuration scheme.

[0107] Example 4:

[0108] This embodiment, based on Embodiment 1, further designs the configuration schemes by having different configuration locations (i.e., different transmission channels) within the configuration scheme set. The configuration scheme set is represented as follows:

[0109] W = (w1, w2, ..., w i ,…,w m )

[0110] In the formula, W represents the set of configuration schemes; w1, w2, ... w i ,…w m These are the 1st, 2nd, ..., ith, ..., mth configuration schemes, where m is the total number of configuration schemes.

[0111] Example 5:

[0112] This embodiment, based on Embodiment 1, further designs the following steps: In this example, based on the Analytic Hierarchy Process (AHP), a judgment matrix is ​​constructed for each level. Based on the judgment matrix, the specific steps for calculating and obtaining the weight of each bottom-level indicator include:

[0113] Based on the analytic hierarchy process (AHP), construct judgment matrix B:

[0114]

[0115] In the formula, b pq For mid-level or low-level indicators x p And mid-level or bottom-level indicators x q A scale for the relative importance between them, b pq =f(x) p ,x q When p = q, b pq =1; p≠q, b pq =1 / b qp , b∈[1,Q], q∈[1,Q]; f(x p ,x q ) is x p and x q Scale function between; x px q These are indicators at the same level.

[0116] f(x p ,x q The pairwise comparison method and the 1-9 comparison scale were used to determine the values ​​and meanings of the matrix elements, as shown in Table 1.

[0117] Table 1 shows the values ​​and meanings of matrix elements.

[0118]

[0119] The constructed judgment matrix B is subjected to consistency verification. The consistency verification can be performed using the following consistency ratio: when the consistency ratio Y < 0.1, it indicates that the judgment matrix is ​​reasonably constructed; otherwise, the judgment matrix needs to be adjusted to meet the consistency verification. The consistency ratio Y is defined as follows:

[0120]

[0121] Where, λ max Q is the largest eigenvalue of the judgment matrix; Q is the order of the judgment matrix; R1 is the average random consistency index, which is a series of numbers obtained by constructing multiple sample matrices by random methods and then performing a series of calculations. It is only related to the order of the judgment matrix Q. When Q is 1-9, the corresponding R1 is E1, E2, E3, E4, E5, E6, E7, E8, and E9, respectively.

[0122] Calculate the largest eigenvalue of the judgment matrix B and its corresponding eigenvector, and then normalize the eigenvector to obtain the weight vector Z.

[0123] Z = (z1, z2, ... z) d ,…z Q )

[0124] In the formula, z1, z2, ... z d ,...z Q These are the weights of the 1st, 2nd, ..., dth, ..., Qth middle-level or bottom-level indicators, respectively, and the elements in the weight vector Z are the weight coefficients corresponding to each indicator.

[0125] Example 6:

[0126] This embodiment is further designed based on Embodiment 1, as follows: Figure 3 As shown, the specific methods for evaluating the superiority of different configuration schemes in this example include:

[0127] Based on the sector radar chart method, a sector radar chart is drawn for each configuration scheme. The expression for the representative value of the sector radar chart in the i-th configuration scheme is:

[0128]

[0129] Where, α d,i The included angle is a sector, α d,i This represents the included angle corresponding to the d-th mid-level or bottom-level indicator in the i-th configuration scheme; z d,i This represents the weight coefficient corresponding to the d-th mid-level or bottom-level indicator in the i-th configuration scheme; x d,i Let x be the radius of the sector. d,i S represents the normalized value of the d-th mid-level or bottom-level metric in the i-th configuration scheme; i S is the sum of the areas of the sectors. i S represents the overall level of the top-level or mid-level indicator under the i-th configuration scheme. i The larger the value, the higher the overall level of the evaluation object (i.e., top-level or mid-level indicator), and vice versa.

[0130] When calculating the line load margin reduction rate index in the underlying indicators, a representative value of the line load margin reduction rate index can be used as the line load margin reduction rate index. The specific method is as follows:

[0131] Construct the line load margin improvement rate index and arrange it into matrix A1:

[0132]

[0133] In matrix A1, each row represents a planned configuration scheme, and each column represents the load margin improvement rate of each line in the transmission section; the minimum value in each row of matrix A1 is selected to form set A2:

[0134] A2=(R xlfzyd,min,1 R xlfzyd,min,2 …R xlfzyd,min,m ) T

[0135] Among them, R xlfzyd,min,i The element representing the minimum value of the line load margin reduction rate index that can be obtained in this section under the i-th configuration scheme is denoted as the representative value of the line load margin reduction rate index.

[0136] Example 7:

[0137] This embodiment, based on embodiment six, further incorporates the following specific steps for selecting the configuration scheme with the best superiority evaluation result as the configuration scheme for the flexible AC / DC regulating device:

[0138] For each configuration scheme, the sum of the sector areas in the corresponding sector radar chart is sorted in descending order to form the resulting matrix S, where S = (S sum,1 ,S sum,2 ,…Ssum,i ,...S sum,m In the formula, S sum,1 ,S sum,2 ,…S sum,i ,...S sum,m These are the superiority evaluation results of the 1st, 2nd, ..., i-th, ..., m-th configuration schemes, i.e., the top-level index values, and S is... sum,1 The corresponding configuration scheme serves as the configuration scheme for the flexible AC / DC regulating device.

[0139] Example 8:

[0140] This invention discloses a flexible AC / DC regulating device configuration system. The flexible AC / DC regulating device is configured in the transmission channel of the target power grid to improve the transmission capacity of the transmission section. The system includes a system construction module, an aggregate construction module, an index calculation module, a hierarchical analysis module, and a superiority evaluation module.

[0141] The system construction module is used to construct a multi-level comprehensive evaluation system for power transmission channels aimed at improving the transmission capacity of power transmission channels. The first layer of the multi-level comprehensive evaluation system is the top-level indicator for evaluating the comprehensive performance of the target grid. The second layer includes the first intermediate-level indicator for evaluating the static stability of the target grid, the second intermediate-level indicator for evaluating the dynamic stability of the target grid, and the third intermediate-level indicator for evaluating the economic benefits of the target grid. The third layer includes the bottom-level indicators under each intermediate-level indicator in the second layer.

[0142] The collection building module is used to build a collection of configuration schemes that include several configuration schemes of flexible AC / DC regulating devices;

[0143] The index calculation module is used to calculate the underlying index value corresponding to each configuration scheme in the configuration scheme set based on the simulation operation data of each configuration scheme under the comprehensive evaluation system of multi-layer power transmission channels.

[0144] The hierarchical analysis module is used to construct judgment matrices for each level based on the hierarchical analysis method, and to calculate and obtain the weight of each bottom-level indicator based on the judgment matrices.

[0145] The superiority evaluation module is used to evaluate the superiority of different configuration schemes based on the underlying index values ​​and weights of each underlying index, and select the configuration scheme with the best superiority evaluation result as the configuration scheme of the flexible AC / DC regulating device.

[0146] Example 9:

[0147] An electronic device includes a memory and a processor. The memory stores a computer program, and the processor is used to invoke and run the computer program stored in the memory to perform the methods of any of the above embodiments.

[0148] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of any of the above embodiments.

[0149] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for configuring a flexible AC / DC regulating device, wherein the flexible AC / DC regulating device is configured in the transmission channel of a target power grid, characterized in that, include: A multi-level comprehensive evaluation system for power transmission channels is constructed to improve the transmission capacity of power transmission channels. The first layer of the multi-level comprehensive evaluation system is a top-level indicator for evaluating the comprehensive performance of the target grid. The second layer includes a first intermediate-level indicator for evaluating the static stability of the target grid, a second intermediate-level indicator for evaluating the dynamic stability of the target grid, and a third intermediate-level indicator for evaluating the economic benefits of the target grid. The third layer includes the bottom-level indicators under each intermediate-level indicator in the second layer. Construct a set of configuration schemes that include several configuration schemes of flexible AC / DC regulating devices; Under the comprehensive evaluation system of the multi-level power transmission channels, the underlying index value corresponding to each configuration scheme in the set of configuration schemes is calculated based on the simulation operation data of each configuration scheme. Based on the analytic hierarchy process, a judgment matrix is ​​constructed for each level, and the weight of each bottom-level indicator is calculated based on the judgment matrix. Based on the underlying index values ​​and weights of each configuration scheme, the superiority of different configuration schemes is evaluated, and the configuration scheme with the best superiority evaluation result is selected as the configuration scheme of the flexible AC / DC regulating device. The underlying indicators under the first middle-level indicators include the cross-sectional transmission capacity improvement ratio, the line load margin improvement rate, and the power flow balance improvement rate. The underlying indicators under the second middle-level indicators include the reduction rate of transient maximum power angle difference, the improvement rate of transient voltage recovery speed, the improvement rate of transient frequency recovery speed, and the reduction rate of short-circuit current peak value. The underlying indicators under the third middle-level indicator include investment costs; The expression for the cross-sectional transmission capacity enhancement ratio is: In the formula, R dmsdrl,i represents the section transmission capacity improvement ratio under the i-th configuration scheme; P 2,i is the transmission capacity of the transmission section under the i-th configuration scheme; P1 is the transmission capacity of the transmission section before the flexible AC / DC regulating device is configured; and m is the total number of configuration schemes. The expression for the line load margin improvement rate is: In the formula, R xlfzyd,k,i represents the line load margin improvement rate of the kth line of the transmission section under the ith configuration scheme; L 1,k,i , L 2,k,i are the load margins of the kth line of the transmission section in the ith configuration scheme before and after the flexible AC / DC regulating device is configured, respectively; P lim1,k,i , P lim2,k,i are the line transmission active power limits of the kth line of the transmission section in the ith configuration scheme before and after the flexible AC / DC regulating device is configured, respectively; P c1,k,i , P c2,k,i are the line transmission active power of the kth line of the transmission section in the ith configuration scheme when stable before and after the flexible AC / DC regulating device is configured, respectively; w is the total number of transmission channels in the transmission section; The expression for the improvement rate of power flow balance is: In the formula, R cljhd,i H represents the power flow balance improvement rate under the i-th configuration scheme; PW H represents the weighted power flow entropy; pw1,i H pw2,i These are the weighted power flow entropies before and after configuring the flexible AC / DC regulator in the i-th configuration scheme, respectively; α is a constant coefficient; ω l Load factor μ l The corresponding weighting coefficient; P(l) is the load factor μ l The corresponding probability coefficient; n is the total number of transmission channels in the target grid; The expression for the reduction rate of the transient maximum power angle difference is: In the formula, R ztzdgjc,i δ represents the reduction rate of the transient maximum power angle difference under the i-th configuration scheme; max1,i δ max2,i These represent the maximum transient power angle difference of the i-th configuration scheme before and after configuring the flexible AC / DC regulator; The expression for the transient voltage recovery rate improvement is: In the formula, R ztdyhfsd,i T represents the improvement rate of transient voltage recovery speed under the i-th configuration scheme; ur1,i T ur2,i These are the transient voltage recovery rates of the i-th candidate configuration scheme before and after configuring the flexible AC / DC regulator, i.e., the time required from the start of the fault until the voltage recovers to 90% of the steady-state value before the fault; The expression for the transient frequency recovery rate improvement is: In the formula, R ztplhfsd,i T represents the improvement rate of transient frequency recovery speed under the i-th configuration scheme; fr1,i T fr2,i These are the transient frequency recovery speeds of the i-th configuration scheme before and after configuring the flexible AC / DC regulator, i.e., the time required for the frequency to recover to the steady-state value before the fault from the time of the fault. The expression for the short-circuit current peak reduction rate is: In the formula, R dldlfz,i I represents the rate of reduction of peak short-circuit current under the i-th configuration scheme; max1,i I max2,i These are the peak short-circuit current values ​​for the i-th configuration scheme before and after configuring the flexible AC / DC regulator, respectively. The expression for the investment cost is: C tz,i =C dw,i ·S all,i ,i=1,2,...,m In the formula, C tz,i The investment cost of the i-th configuration option; C dw,i S represents the unit capacity configuration cost under the i-th configuration scheme; all,i The total capacity of the flexible AC / DC regulating device configured under the i-th configuration scheme; The specific methods for evaluating the superiority of different configuration schemes include: Based on the sector radar chart method, a sector radar chart is drawn for each configuration scheme. The expression for the representative value of the sector radar chart in the i-th configuration scheme is: Where, α d,i The included angle is a sector, α d,i This represents the included angle corresponding to the d-th mid-level or bottom-level indicator in the i-th configuration scheme; z d,i This represents the weight coefficient corresponding to the d-th mid-level or bottom-level indicator in the i-th configuration scheme; x d,i Let x be the radius of the sector. d,i S represents the normalized value of the d-th mid-level or bottom-level metric in the i-th configuration scheme; i S is the sum of the areas of the sectors. i This represents the overall level of the top-level or mid-level indicators under the i-th configuration scheme; The specific steps for selecting the configuration scheme with the best superiority evaluation result as the configuration scheme of the flexible AC / DC regulation device include: For each configuration scheme, the sum of the sector areas in the corresponding sector radar chart is sorted in descending order to form the resulting matrix S, where S = (S sum,1 ,S sum,2 ,...S sum,i ,...S sum,m In the formula, S sum,1 ,S sum,2 ,...S sum,i ,...S sum,m These are the superiority evaluation results of the 1st, 2nd, ..., i-th, ..., m-th configuration schemes, i.e., the top-level index values, and S is... sum,1 The corresponding configuration scheme serves as the configuration scheme for the flexible AC / DC regulating device.

2. The configuration method of the flexible AC / DC regulating device according to claim 1, characterized in that, The configuration scheme set contains different configuration schemes with different configuration locations, and the configuration scheme set is represented as W = (w1, w2, ..., w i ,...,w m ) In the formula, W represents the set of configuration schemes; w1, w2, ... w i ,...w m These are the 1st, 2nd, ..., ith, ..., mth configuration schemes, where m is the total number of configuration schemes.

3. The configuration method of the flexible AC / DC regulating device according to claim 1, characterized in that, The specific steps for constructing judgment matrices for each level based on the analytic hierarchy process (AHP), and calculating the weight of each bottom-level indicator based on the judgment matrices, include: Based on the analytic hierarchy process (AHP), construct judgment matrix B: In the formula, b pq For mid-level or low-level indicators x p And mid-level or bottom-level indicators x q A scale for the relative importance between them, b pq =f(x) p ,x q When p = q, b pq =1; p≠q, b pq =1 / b qp , b∈[1,Q], q∈[1,Q]; f(x p ,x q ) is x p and x q Between scaling functions; Perform a consistency check on the constructed judgment matrix B; Calculate the largest eigenvalue and its corresponding eigenvector of the judgment matrix B, and then normalize the eigenvector to obtain the weight vector Z. Z=(z1,z2,...,z d ,...,With Q ) In the formula, z1, z2, ... z d ,...z Q These are the weights of the 1st, 2nd, ..., dth, ..., Qth intermediate or bottom-level indicators, respectively.

4. A flexible AC / DC regulating device configuration system applying the flexible AC / DC regulating device configuration method according to any one of claims 1-3, wherein the flexible AC / DC regulating device is configured in the transmission channel of the target grid, characterized in that, It includes a system construction module, a set construction module, an indicator calculation module, an analytic hierarchy process (AHP) module, and a superiority evaluation module; among which, The system construction module is used to construct a multi-level comprehensive evaluation system for power transmission channels aimed at improving the transmission capacity of power transmission channels. The first layer of the multi-level comprehensive evaluation system is a top-level indicator for evaluating the comprehensive performance of the target grid. The second layer includes a first intermediate-level indicator for evaluating the static stability of the target grid, a second intermediate-level indicator for evaluating the dynamic stability of the target grid, and a third intermediate-level indicator for evaluating the economic benefits of the target grid. The third layer includes the bottom-level indicators under each intermediate-level indicator in the second layer. The set construction module is used to construct a set of configuration schemes that includes several configuration schemes of flexible AC / DC regulating devices; The index calculation module is used to calculate the underlying index value corresponding to each configuration scheme in the configuration scheme set based on the simulation operation data of each configuration scheme under the multi-level power transmission channel comprehensive evaluation system. The hierarchical analysis module is used to construct judgment matrices for each level based on the hierarchical analysis method, and to calculate and obtain the weight of each bottom-level indicator based on the judgment matrices. The superiority evaluation module is used to evaluate the superiority of different configuration schemes based on the underlying index values ​​and weights of each underlying index, and select the configuration scheme with the best superiority evaluation result as the configuration scheme of the flexible AC / DC regulating device.

5. An electronic device, characterized in that, The electronic device includes a memory and a processor, the memory storing a computer program, and the processor being used to invoke and run the computer program stored in the memory to perform the method as described in any one of claims 1 to 3.

6. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1 to 3 above.

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