Flexible AC / DC adjusting device configuration method and system

Abstract

The invention discloses a flexible AC / DC adjusting device configuration method and system, and the method comprises the steps: constructing a multi-layer power transmission channel comprehensive evaluation system for improving the transmission capability of a power transmission channel, and a configuration scheme set, calculating a bottom index value corresponding to each configuration scheme under the multi-layer power transmission channel comprehensive evaluation system, and carrying out the calculation of a bottom index value corresponding to each configuration scheme; and then, based on an analytic hierarchy process and the judgment matrix, calculating and obtaining the weight of each underlying index, thereby carrying out superiority evaluation on different configuration schemes, and selecting the configuration scheme with the best superiority evaluation result as the configuration scheme of the flexible AC / DC regulation device. According to the method, through multi-dimensional evaluation related to static stability, dynamic stability and economic benefit, a comprehensive optimal configuration scheme can be obtained, so that the transmission capability of the power transmission channel can be comprehensively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of power system evaluation, and in particular relates to a flexible AC / DC regulation device configuration method and system. Background Art

[0002] With the rapid development of the economy and society, the demand for electricity in load centers has increased massively. However, many load centers are concentrated in urban core areas, such as government agencies, hospitals, and schools. These areas have limited land resources and cannot simply add transmission lines to meet the growing demand for power supply. In this context, improving the transmission capacity of existing transmission channels has become a key task to ensure the safety and stability of power supply.

[0003] As an important part of modern power systems, flexible AC transmission technology and flexible AC / DC power flow regulation devices have shown significant advantages in improving the transmission capacity of transmission channels. Through flexible adjustment of power flow and optimization of power distribution, flexible devices can improve the static stability and dynamic response capabilities of the power grid and alleviate transmission bottlenecks. In addition, these devices can also improve the overall operating efficiency of the system by reducing power loss and optimizing the economic efficiency of the transmission network. Therefore, how to scientifically configure these devices to improve the capacity of the transmission section has become a key area of ​​current research.

[0004] At present, the research on flexible AC and DC power flow regulation devices at home and abroad mainly focuses on their planning and optimization configuration methods. However, most of the existing research stays on the optimization of a single indicator (such as static stability or economy), lacking a systematic evaluation of multi-dimensional comprehensive performance. In order to comprehensively improve the capacity of the transmission channel, it is urgent to establish a planning method based on the comprehensive evaluation of static stability, dynamic stability and economic benefits to promote the further development and application of flexible device configuration technology. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention proposes a flexible AC / DC regulation device configuration method and system.

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

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

[0008] Construct a multi-level transmission channel comprehensive evaluation system for improving the transmission capacity of the transmission channel, wherein the first level of the multi-level transmission channel comprehensive evaluation system is a top-level indicator for evaluating the comprehensive performance of the target grid, the second level includes a first middle-level indicator for evaluating the static stability of the target grid, a second middle-level indicator for evaluating the dynamic stability of the target grid, and a third middle-level indicator for evaluating the economic benefits of the target grid, and the third level includes bottom-level indicators under each middle-level indicator in the second level;

[0009] Constructing a configuration scheme set including several configuration schemes of the flexible AC / DC regulating device;

[0010] Under the multi-layer transmission channel comprehensive evaluation system, the underlying indicator 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 hierarchical analysis method, a judgment matrix of each level is constructed, and based on the judgment matrix, the weight of each bottom-level indicator is calculated;

[0012] Based on the underlying indicator value corresponding to each configuration scheme and the weight of each underlying indicator, 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 regulation device.

[0013] Furthermore, the bottom-level indicators under the first middle-level indicator include the section transmission capacity improvement ratio, the line load margin improvement rate and the power flow balance improvement rate;

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

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

[0016] Furthermore, the expression of the section transmission capacity improvement ratio is:

[0017]

[0018] 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 regulation device is configured; m is the total number of configuration schemes;

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

[0020]

[0021] In the formula, R xlfzyd,k,i represents the line load margin improvement rate on the kth line of the transmission section under the i-th configuration scheme; L 1,k,i , L 2,k,i are the load margins of the kth line of the transmission section in the i-th configuration scheme before and after the flexible AC / DC regulation device is configured; P lim1,k,i , P lim2,k,i are the active power limits of the kth line in the transmission section of the i-th configuration scheme before and after the flexible AC / DC regulation device is configured; P c1,k,i , P c2,k,i are the active power transmitted by the kth line in the transmission section in the i-th configuration scheme before and after the flexible AC / DC regulation device is configured when the line is stable; w is the total number of transmission channels in the transmission section;

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

[0023]

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

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

[0026]

[0027] In the formula, R ztzdgjc,i represents the transient maximum power angle difference reduction rate under the i-th configuration scheme; δ max1,i , δ max2,i are respectively the transient maximum power angle differences of the i-th configuration scheme before and after the configuration of the flexible AC / DC regulation device;

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

[0029]

[0030] In the formula, R ztdyhfsd,i represents the transient voltage recovery speed improvement rate under the i-th configuration scheme; Tur1,i , T ur2,i are the transient voltage recovery speeds of the i-th candidate configuration scheme before and after the flexible AC / DC regulator is configured, i.e., the time required from the moment of the fault to the time when the voltage recovers to 90% of the steady-state value before the fault;

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

[0032]

[0033] In the formula, R ztplhfsd,i represents the transient frequency recovery speed improvement rate under the i-th configuration scheme; T fr1,i , T fr2,i are the transient frequency recovery speeds of the i-th configuration scheme before and after the configuration of the flexible AC / DC regulation device, that is, the time required from the moment of the fault to the frequency recovery to the steady-state value before the fault;

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

[0035]

[0036] In the formula, R dldlfz,i represents the short-circuit current peak reduction rate under the i-th configuration scheme; I max1,i ,I max2,i are respectively the short-circuit current peaks of the i-th configuration scheme before and after the flexible AC / DC regulation device is configured.

[0037] The expression of 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 plan; C dw,i is the unit capacity configuration cost under the i-th configuration scheme; S all,i is the total capacity of the flexible AC / DC regulation device configured under the i-th configuration scheme.

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

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

[0042] Where W is the set of configuration solutions; w1,w2,...w i ,…wm They are the 1st, 2nd, ..., i-th, ..., m-th configuration schemes respectively, and m is the total number of configuration schemes.

[0043] Furthermore, the specific steps of constructing a judgment matrix of each level based on the hierarchical analysis method and calculating the weight of each bottom-level indicator based on the judgment matrix include:

[0044] Based on the hierarchical analysis method, construct the judgment matrix B:

[0045]

[0046] Where b pq is a middle-level indicator or a bottom-level indicator x p and the middle-level or bottom-level indicator x q The relative importance scale between 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 consistency check on the constructed judgment matrix B;

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

[0049] Z=(z1,z2,...,z d ,…,z Q )

[0050] Where z1, z2, … z d ,…z Q They are the weights of the 1st, 2nd, ..., dth, ..., Qth middle-level indicators or bottom-level indicators respectively.

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

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

[0053]

[0054] Among them, αd,i is the fan angle, α d,i represents the angle corresponding to the dth middle-level indicator or bottom-level indicator in the ith configuration scheme; z d,i represents the weight coefficient corresponding to the dth middle-level indicator or bottom-level indicator in the ith configuration scheme; x d,i is the sector radius, x d,i S represents the normalized value of the dth middle-level indicator or bottom-level indicator in the ith configuration scheme; i is the area of ​​the sector, S i It represents the overall level of top-level or middle-level indicators under the i-th configuration scheme.

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

[0056] The sum of the sector areas in the sector radar chart corresponding to each configuration scheme is arranged in descending order to form a result matrix S, S = (S sum,1 ,S sum,2 ,...S sum,i ,...S sum,m ), where S sum,1 ,S sum,2 ,...S sum,i ,...S sum,m are the superiority evaluation results of the 1st, 2nd, ..., i, ..., mth configuration schemes, i.e., the top-level index values. sum,1 The corresponding configuration scheme is used as the configuration scheme of the flexible AC / DC regulation device.

[0057] A flexible AC / DC regulator configuration system, wherein the flexible AC / DC regulator is configured in a transmission channel of a target grid to improve the transmission capacity of a transmission section, comprising a system construction module, a collection construction module, an index calculation module, a hierarchical analysis module and a superiority evaluation module; wherein:

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

[0059] The set construction module is used to construct a configuration scheme set including several configuration schemes of the flexible AC / DC regulation device;

[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 multi-layer transmission channel comprehensive evaluation system;

[0061] The hierarchical analysis module is used to construct a judgment matrix of each level based on the hierarchical analysis method, and calculate the weight of each bottom-level indicator based on the judgment matrix;

[0062] The superiority evaluation module is used to evaluate the superiority of the different configuration schemes based on the underlying indicator value corresponding to each configuration scheme and the weight of each underlying indicator, and select the configuration scheme with the best superiority evaluation result as the configuration scheme of the flexible AC / DC regulation device.

[0063] An electronic device comprises a memory and a processor, wherein the memory stores a computer program, and the processor is used to call and run the computer program stored in the memory to execute any of the methods described above.

[0064] A computer-readable storage medium stores a computer program, wherein the computer program implements the steps of any of the above methods when executed by a processor.

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

[0066] The present invention proposes a method and system for configuring a flexible AC / DC regulating device. The method constructs a multi-level transmission channel comprehensive evaluation system and a configuration scheme set for improving the transmission capacity of the transmission channel. Then, under the multi-level transmission channel comprehensive evaluation system, the underlying index value corresponding to each configuration scheme is calculated. Then, based on the hierarchical analysis method and the judgment matrix, the weight of each underlying index is calculated to evaluate the superiority of different configuration schemes, and the configuration scheme with the best superiority evaluation result is selected as the configuration scheme of the flexible AC / DC regulating device. The method can obtain the most comprehensive configuration scheme through multi-dimensional evaluation related to static stability, dynamic stability and economic efficiency, thereby comprehensively improving the transmission capacity of the transmission channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 It is a flow chart of a method for configuring a flexible AC / DC regulating device in an embodiment;

[0068] Figure 2 Schematic diagram of the hierarchical structure of the comprehensive evaluation system mentioned in the embodiment;

[0069] Figure 3 Schematic diagram of a sector radar chart in an embodiment. DETAILED DESCRIPTION

[0070] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent modifications of the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0071] Embodiment 1:

[0072] A method for configuring a flexible AC / DC regulator of the present invention, wherein the flexible AC / DC regulator is configured in a transmission channel of a target grid to improve the transmission capacity of a transmission section, such as Figure 1 As shown, the method comprises the following specific steps:

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

[0074] S2, constructing a configuration scheme set including several configuration schemes of the flexible AC / DC regulating device;

[0075] S3. Under the multi-layer transmission channel comprehensive evaluation system, the underlying indicator value corresponding to each configuration scheme in the configuration scheme set is calculated based on the simulation operation data of each configuration scheme;

[0076] S4. Based on the hierarchical analysis method, construct the judgment matrix of each level, and calculate the weight of each bottom-level indicator based on the judgment matrix;

[0077] S5. Based on the underlying indicator value corresponding to each configuration scheme and the weight of each underlying indicator, 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 regulation device.

[0078] Embodiment 2:

[0079] This embodiment is further designed on the basis of the first embodiment in that: Figure 2 As shown, the bottom-level indicators under the first middle-level indicator in this example include the section transmission capacity improvement ratio, line load margin improvement rate and power flow balance improvement rate;

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

[0081] The underlying indicators under the 3rd middle level indicators include investment costs.

[0082] Embodiment three:

[0083] This embodiment is further designed on the basis of the second embodiment in that the expression of the section transmission capacity improvement ratio in this embodiment is:

[0084]

[0085] 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 regulation device is configured; m is the total number of configuration schemes;

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

[0087]

[0088] In the formula, R xlfzyd,k,i represents the line load margin improvement rate on the kth line of the transmission section under the i-th configuration scheme; L 1,k,i , L 2,k,i are the load margins of the kth line of the transmission section in the i-th configuration scheme before and after the flexible AC / DC regulation device is configured; P lim1,k,i , P lim2,k,i are the active power limits of the kth line in the transmission section of the i-th configuration scheme before and after the flexible AC / DC regulation device is configured; P c1,k,i , P c2,k,i are the active power transmitted by the kth line in the transmission section in the i-th configuration scheme before and after the flexible AC / DC regulation device is configured when the line is stable; w is the total number of transmission channels in the transmission section;

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

[0090]

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

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

[0093]

[0094] In the formula, R ztzdgjc,i represents the transient maximum power angle difference reduction rate under the i-th configuration scheme; δ max1,i , δ max2,i are respectively the transient maximum power angle differences of the i-th configuration scheme before and after the configuration of the flexible AC / DC regulation device;

[0095] The expression of transient voltage recovery speed improvement rate is:

[0096]

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

[0098] The expression of transient frequency recovery speed improvement rate is:

[0099]

[0100] In the formula, R ztplhfsd,i represents the transient frequency recovery speed improvement rate under the i-th configuration scheme; T fr1,i , T fr2,i are the transient frequency recovery speeds of the i-th configuration scheme before and after the configuration of the flexible AC / DC regulation device, that is, the time required from the moment of the fault to the frequency recovery to the steady-state value before the fault;

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

[0102]

[0103] In the formula, R dldlfz,i represents the short-circuit current peak reduction rate under the i-th configuration scheme; I max1,i ,I max2,i are respectively the short-circuit current peaks of the i-th configuration scheme before and after the flexible AC / DC regulation device is configured.

[0104] The expression of investment cost 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 plan; C dw,i is the unit capacity configuration cost under the i-th configuration scheme; S all,i is the total capacity of the flexible AC / DC regulation device configured under the i-th configuration scheme.

[0107] Embodiment 4:

[0108] This embodiment is further designed on the basis of the first embodiment in that different configuration schemes in the configuration scheme set in this example have different configuration locations, that is, different power transmission channels. The configuration scheme set is represented as

[0109] W=(w1,w2,...,w i ,…,w m )

[0110] Where W is the set of configuration options; w1,w2,…w i ,…w m They are the 1st, 2nd, ..., i-th, ..., m-th configuration schemes respectively, and m is the total number of configuration schemes.

[0111] Embodiment five:

[0112] This embodiment is further designed on the basis of the first embodiment in that, based on the hierarchical analysis method, a judgment matrix of each level is constructed in this embodiment. Based on the judgment matrix, the specific steps of calculating and obtaining the weight of each bottom-level indicator include:

[0113] Based on the hierarchical analysis method, construct the judgment matrix B:

[0114]

[0115] Where b pq is a middle-level indicator or a bottom-level indicator x p and the middle-level or bottom-level indicator x q The relative importance scale between 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 Scaling function between x p、x q are indicators at the same level.

[0116] f(x p ,x q ) was determined using the paired comparison method and the 1-9 comparison scale. The values ​​and meanings of the judgment matrix elements are shown in Table 1.

[0117] Table 1 Judgment matrix element values ​​and meanings

[0118]

[0119] The constructed judgment matrix B is checked for consistency. The consistency check can be performed using the following consistency ratio. That is, when the consistency ratio Y<0.1, it means that the judgment matrix is ​​reasonably constructed. Otherwise, the judgment matrix needs to be adjusted to satisfy the consistency check. The consistency ratio Y is defined as follows:

[0120]

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

[0122] Calculate the maximum eigenvalue of the judgment matrix B and its corresponding eigenvector, and 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 They are the weights of the 1st, 2nd, ..., dth, ..., Qth middle-level indicators or bottom-level indicators respectively. The elements in the weight vector Z are the weight coefficients corresponding to each indicator.

[0125] Embodiment six:

[0126] This embodiment is further designed on the basis of the first embodiment in that: Figure 3 As shown, the specific methods for evaluating the superiority of different configuration schemes in this example include:

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

[0128]

[0129] Among them, α d,i is the fan angle, α d,i represents the angle corresponding to the dth middle-level indicator or bottom-level indicator in the ith configuration scheme; z d,i represents the weight coefficient corresponding to the dth middle-level indicator or bottom-level indicator in the ith configuration scheme; x d,i is the sector radius, x d,i S represents the normalized value of the dth middle-level indicator or bottom-level indicator in the ith configuration scheme; i is the area of ​​the sector, S i represents the overall level of top-level or middle-level indicators under the i-th configuration scheme, S i The larger the value is, the higher the overall level of the evaluation object (i.e., top-level indicators or middle-level indicators), and vice versa.

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

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

[0132]

[0133] Each row in the matrix A1 represents each planning configuration scheme, and each column represents the load margin improvement rate of each line in the transmission section; the minimum value of each row in the matrix A1 is selected to form a 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 the section under the i-th configuration scheme is recorded as the representative value of the line load margin reduction rate index.

[0136] Embodiment seven:

[0137] This embodiment is further designed on the basis of the sixth embodiment in that the specific steps of selecting the configuration scheme with the best superiority evaluation result as the configuration scheme of the flexible AC / DC regulating device in this embodiment include:

[0138] The sum of the sector areas in the sector radar chart corresponding to each configuration scheme is arranged in descending order to form a result matrix S, S = (S sum,1 ,S sum,2 ,…Ssum,i ,...S sum,m ), where S sum,1 ,S sum,2 ,…S sum,i ,...S sum,m are the superiority evaluation results of the 1st, 2nd, ..., i, ..., mth configuration schemes, i.e., the top-level index values. sum,1 The corresponding configuration scheme is used as the configuration scheme of the flexible AC / DC regulation device.

[0139] Embodiment eight:

[0140] A flexible AC / DC regulator configuration system of the present invention, wherein the flexible AC / DC regulator is configured in a transmission channel of a target grid to improve the transmission capacity of a transmission section, comprises a system construction module, a collection construction module, an index calculation module, a hierarchical analysis module and a superiority evaluation module; wherein,

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

[0142] A set construction module, used to construct a configuration scheme set including a plurality of configuration schemes of the flexible AC / DC regulation device;

[0143] An 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-layer transmission channel comprehensive evaluation system;

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

[0145] The superiority evaluation module is used to evaluate the superiority of different configuration schemes based on the underlying indicator value corresponding to each configuration scheme and the weight of each underlying indicator, and select the configuration scheme with the best superiority evaluation result as the configuration scheme of the flexible AC / DC regulation device.

[0146] Embodiment nine:

[0147] An electronic device includes a memory and a processor, wherein the memory stores a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method of any of the above embodiments.

[0148] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of any of the above embodiments are implemented.

[0149] The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A method for configuring a flexible AC / DC regulator, wherein the flexible AC / DC regulator is configured in a power transmission channel of a target grid, characterized in that: include: Construct a multi-level transmission channel comprehensive evaluation system for improving the transmission capacity of the transmission channel, wherein the first level of the multi-level transmission channel comprehensive evaluation system is a top-level indicator for evaluating the comprehensive performance of the target grid, the second level includes a first middle-level indicator for evaluating the static stability of the target grid, a second middle-level indicator for evaluating the dynamic stability of the target grid, and a third middle-level indicator for evaluating the economic benefits of the target grid, and the third level includes bottom-level indicators under each middle-level indicator in the second level; Constructing a configuration scheme set including several configuration schemes of the flexible AC / DC regulating device; Under the multi-layer transmission channel comprehensive evaluation system, the underlying indicator value corresponding to each configuration scheme in the configuration scheme set is calculated based on the simulation operation data of each configuration scheme; Based on the hierarchical analysis method, a judgment matrix of each level is constructed, and based on the judgment matrix, the weight of each bottom-level indicator is calculated; Based on the underlying indicator value corresponding to each configuration scheme and the weight of each underlying indicator, 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 regulation device.

2. The method for configuring a flexible AC / DC regulator according to claim 1, characterized in that: The bottom-level indicators under the first middle-level indicator include the section transmission capacity improvement ratio, line load margin improvement rate and power flow balance improvement rate; The bottom-level indicators under the second middle-level indicators include the transient maximum power angle difference reduction rate, the transient voltage recovery speed improvement rate, the transient frequency recovery speed improvement rate and the short-circuit current peak reduction rate; The bottom-level indicators under the third middle-level indicator include investment costs.

3. The method for configuring a flexible AC / DC regulator according to claim 2, characterized in that: The expression of the section transmission capacity improvement 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 regulation device is configured; m is the total number of configuration schemes; The expression of the line load margin improvement rate is: In the formula, R xlfzyd,k,i represents the line load margin improvement rate on the kth line of the transmission section under the i-th configuration scheme; L 1,k,i , L 2,k,i are the load margins of the kth line of the transmission section in the i-th configuration scheme before and after the flexible AC / DC regulation device is configured; P lim1,k,i , P lim2,k,i are the active power limits of the kth line in the transmission section of the i-th configuration scheme before and after the flexible AC / DC regulation device is configured; P c1,k,i , P c2,k,i are the active power transmitted by the kth line in the transmission section in the i-th configuration scheme before and after the flexible AC / DC regulation device is configured when the line is stable; w is the total number of transmission channels in the transmission section; The expression of the power flow balance improvement rate is: In the formula, R cljhd,i represents the improvement rate of power flow balance under the i-th configuration scheme; H PW represents the weighted power flow entropy; H pw1,i , H pw2,i are the weighted power flow entropies before and after the flexible AC / DC regulation device is configured in the i-th configuration scheme; α is a constant coefficient; ω l is the load factor μ l The corresponding weight coefficient; P(l) is the load rate μ l The corresponding probability coefficient; n is the total number of transmission channels in the target grid; The expression of the transient maximum power angle difference reduction rate is: In the formula, R ztzdgjc,i represents the transient maximum power angle difference reduction rate under the i-th configuration scheme; δ max1,i , δ max2,i are respectively the transient maximum power angle differences of the i-th configuration scheme before and after the configuration of the flexible AC / DC regulation device; The expression of the transient voltage recovery speed improvement rate is: In the formula, R ztdyhfsd,i represents the transient voltage recovery speed improvement rate under the i-th configuration scheme; T ur1,i , T ur2,i are the transient voltage recovery speeds of the i-th candidate configuration scheme before and after the flexible AC / DC regulator is configured, i.e., the time required from the moment of the fault to the time when the voltage recovers to 90% of the steady-state value before the fault; The expression of the transient frequency recovery speed improvement rate is: In the formula, R ztplhfsd,i represents the transient frequency recovery speed improvement rate under the i-th configuration scheme; T fr1,i , T fr2,i are the transient frequency recovery speeds of the i-th configuration scheme before and after the configuration of the flexible AC / DC regulation device, that is, the time required from the moment of the fault to the frequency recovery to the steady-state value before the fault; The expression of the short-circuit current peak reduction rate is: In the formula, R dldlfz,i represents the short-circuit current peak reduction rate under the i-th configuration scheme; I max1,i ,I max2,i are the short-circuit current peaks of the i-th configuration scheme before and after the flexible AC / DC regulator is configured; The expression of 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 plan; C dw,i is the unit capacity configuration cost under the i-th configuration scheme; S all,i is the total capacity of the flexible AC / DC regulation device configured under the i-th configuration scheme.

4. The method for configuring a flexible AC / DC regulator according to claim 1, characterized in that: Different configuration schemes in the configuration scheme set have different configuration locations, and the configuration scheme set is represented as In=(in1,in2,...,in i ,...,In m ) Where W is the set of configuration solutions; w1,w2,...w i ,…w m They are the 1st, 2nd, ..., i-th, ..., m-th configuration schemes respectively, and m is the total number of configuration schemes.

5. The method for configuring a flexible AC / DC regulator according to claim 1, characterized in that: The specific steps of constructing the judgment matrix of each level based on the hierarchical analysis method and calculating the weight of each bottom-level indicator based on the judgment matrix include: Based on the hierarchical analysis method, construct the judgment matrix B: Where b pq is a middle-level indicator or a bottom-level indicator x p and the middle-level or bottom-level indicator x q The relative importance scale between 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 consistency check on the constructed judgment matrix B; Calculate the maximum eigenvalue of the judgment matrix B and its corresponding eigenvector, and normalize the eigenvector to obtain a weight vector Z. Z=(z1,z2,...,z d ,...,With Q ) In the formula, z1,z2,...z d ,...z Q They are the weights of the 1st, 2nd, ..., dth, ..., Qth middle-level indicators or bottom-level indicators respectively.

6. The method for configuring a flexible AC / DC regulator according to claim 1, characterized in that: The specific method for evaluating the superiority of the different configuration schemes includes: Based on the fan radar chart method, a fan radar chart corresponding to each configuration scheme is drawn. The representative value expression of the fan radar chart in the i-th configuration scheme is: Among them, α d,i is the fan angle, α d,i represents the angle corresponding to the dth middle-level indicator or bottom-level indicator in the ith configuration scheme; z d,i represents the weight coefficient corresponding to the dth middle-level indicator or bottom-level indicator in the ith configuration scheme; x d,i is the sector radius, x d,i S represents the normalized value of the dth middle-level indicator or bottom-level indicator in the ith configuration scheme; i is the area of ​​the sector, S i It represents the overall level of top-level or middle-level indicators under the i-th configuration scheme.

7. The method for configuring a flexible AC / DC regulator according to claim 6, characterized in that: The specific steps of selecting the configuration scheme with the best superiority evaluation result as the configuration scheme of the flexible AC / DC regulator include: The sum of the sector areas in the sector radar chart corresponding to each configuration scheme is arranged in descending order to form a result matrix S, S = (S sum,1 ,S sum,2 ,...S sum,i ,...S sum,m ), where S sum,1 ,S sum,2 ,...S sum,i ,...S sum,m are the superiority evaluation results of the 1st, 2nd, ..., i, ..., mth configuration schemes, i.e., the top-level index values. sum,1 The corresponding configuration scheme is used as the configuration scheme of the flexible AC / DC regulation device.

8. A flexible AC / DC regulator configuration system using the flexible AC / DC regulator configuration method according to any one of claims 1 to 7, wherein the flexible AC / DC regulator is configured in a power transmission channel of a target grid, characterized in that: It includes system construction module, set construction module, indicator calculation module, hierarchical analysis module and superiority evaluation module; among them, The system construction module is used to construct a multi-level transmission channel comprehensive evaluation system for improving the transmission capacity of the transmission channel. The first layer of the multi-level transmission channel comprehensive evaluation system is a top-level indicator for evaluating the comprehensive performance of the target grid. The second layer includes a first middle-level indicator for evaluating the static stability of the target grid, a second middle-level indicator for evaluating the dynamic stability of the target grid, and a third middle-level indicator for evaluating the economic benefits of the target grid. The third layer includes bottom-level indicators under each middle-level indicator in the second layer. The set construction module is used to construct a configuration scheme set including several configuration schemes of the flexible AC / DC regulation device; 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-layer transmission channel comprehensive evaluation system; The hierarchical analysis module is used to construct a judgment matrix of each level based on the hierarchical analysis method, and calculate the weight of each bottom-level indicator based on the judgment matrix; The superiority evaluation module is used to evaluate the superiority of the different configuration schemes based on the underlying indicator value corresponding to each configuration scheme and the weight of each underlying indicator, and select the configuration scheme with the best superiority evaluation result as the configuration scheme of the flexible AC / DC regulation device.

9. An electronic device, characterized in that: The electronic device comprises a memory and a processor, wherein the memory stores a computer program, and the processor is configured to call and run the computer program stored in the memory to execute the method according to any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method as claimed in any one of claims 1 to 7 are implemented.

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