Short-circuit current limiter configuration optimization method and system based on sensitivity index

Abstract

The present invention discloses a method and system for optimizing the configuration of a short-circuit current limiter based on a sensitivity index, belonging to the technical field of power transmission systems. The method of the present invention includes: obtaining a first original installation plan F1 of a fault current limiter; generating a second installation plan F2 of a fault current limiter and a third installation plan F3 of a fault current limiter based on the power grid research data; and establishing a short-circuit current limiting scheme evaluation index set W; calculating the index values ​​C corresponding to the first original installation plan F1 of the fault current limiter, the second installation plan F2 of the fault current limiter, and the third installation plan F3 of the fault current limiter, respectively. k ; Select index value C k The highest solution is used as the optimized solution, and the short-circuit current limiter is configured according to the optimized solution. The present invention can significantly reduce the short-circuit current of the site without changing the existing structure of the power grid, thereby ensuring the stable operation of the power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission systems, and more particularly, to a short-circuit current limiter configuration optimization method based on a sensitivity index. Background Art

[0002] my country's power grid is primarily in a transition phase toward a higher-voltage grid. While higher-voltage transmission lines are beginning to emerge, the existing voltage grid remains the primary transmission network. Large-capacity generating units and power plants are directly connected to the higher-voltage grid. Due to the increased use of autotransformers, the higher-voltage transmission network often forms a high- and low-voltage electromagnetic loop with the existing voltage grid. This significantly increases short-circuit current levels in the existing voltage grid, making short-circuit current issues widespread and severe. The rapidly growing load on the receiving-end grid and the densely packed grid structure present a shortage of receiving capacity, yet short-circuit current margins limit expansion. Summary of the Invention

[0003] In response to the above problems, the present invention proposes a short-circuit current limiter configuration optimization method based on sensitivity index, comprising:

[0004] Building power grid research data, obtaining a first fault current limiter original installation plan F1 based on the power grid research data, generating a second fault current limiter installation plan F2 and a third fault current limiter installation plan F3 based on the power grid research data, and establishing a short-circuit current limiting plan evaluation index set W based on a sensitivity index;

[0005] Based on the short-circuit current limiting scheme evaluation index set W, the index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 are calculated. k ;

[0006] Select the index value C in the original installation plan F1 of the first fault current limiter, the second fault current limiter installation plan F2 and the third fault current limiter installation plan F3 k The highest one is taken as the optimized solution, and the short-circuit current limiter is configured according to the optimized solution.

[0007] Optionally, based on the power grid research data, generating a second fault current limiter installation plan F2 and a third fault current limiter installation plan F3 includes:

[0008] Based on the power grid research data, calculate the short-circuit current of the site in the power grid;

[0009] The sites where the short-circuit current exceeds 90% of the rated interrupting capacity are selected to form the short-circuit current exceeding site set S;

[0010] Calculate the short-circuit current composition ratio of all sites in the short-circuit current exceeding site set S, and group the branch lines with the top four contribution ratios into a set T;

[0011] Calculate the short-circuit current contribution index of any branch in the set T to the node in the short-circuit current exceeding site set S, and form the short-circuit current contribution index matrix R;

[0012] Calculate the sensitivity index of the impact of any branch in the set T on the short-circuit current of the node in the short-circuit current exceeding site set S, and form the short-circuit current sensitivity index matrix L;

[0013] Select the site with the largest short-circuit current from the set S of sites with excessive short-circuit current, install a fault current limiter on the branch with the highest corresponding sensitivity index, and adjust the installed capacity;

[0014] removing the branch on which the fault current limiter is installed from the short-circuit current sensitivity index matrix L to adjust the short-circuit current sensitivity index matrix L;

[0015] Based on the adjusted short-circuit current sensitivity index matrix L, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked, and when it is determined that no site exceeds the standard, a second fault current limiter installation plan F2 is generated;

[0016] Select the site with the largest short-circuit current from the set S of sites with excessive short-circuit current, install a fault current limiter on the branch with the highest corresponding contribution index, and adjust the installed capacity;

[0017] The branch on which the fault current limiter is installed is removed from the short-circuit current contribution index matrix R to adjust the short-circuit current contribution index matrix R;

[0018] Based on the adjusted short-circuit current contribution index matrix R, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked. When it is determined that no exceeding site exists, a third fault current limiter installation plan F3 is generated.

[0019] Optionally, based on the adjusted short-circuit current sensitivity index matrix L, the short-circuit current of all sites in the short-circuit current exceeding site set S is checked. If there is a site exceeding the standard, the site with the largest short-circuit current in the short-circuit current exceeding site set S is selected, and the branch with the highest sensitivity index L corresponding to the site is installed with a fault current limiter, and the installation capacity is adjusted again.

[0020] Optionally, based on the adjusted short-circuit current contribution index matrix R, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked. If there is an exceeding site, the site with the largest short-circuit current in the short-circuit current exceeding site set S is selected, and the branch with the highest corresponding contribution index is installed with a fault current limiter, and the installation capacity is adjusted again.

[0021] Optionally, based on the short-circuit current limiting scheme evaluation index set W, the index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 are calculated. k ,include:

[0022] Calculating the values ​​of the elements of the short-circuit current limiting scheme evaluation index set W for the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2, and the third fault current limiter installation scheme F3 to generate a short-circuit current limiting index comparison matrix C;

[0023] Based on the comparison matrix C, the index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 are calculated. k .

[0024] Optionally, the short-circuit current limiting scheme evaluation index set W includes: w1 exceeding the standard site short-circuit current margin index w1, w2 exceeding the standard site regional network loss index w2 and w3 unit capacity cost index w3.

[0025] Optionally, the calculation formula for the short-circuit current margin index w1 of the exceeding-standard site is as follows:

[0026]

[0027] Among them, K SC In order to introduce the short-circuit current margin index of the site with exceeded standards, n1 is the number of sites with exceeded standards, and I RCi is the rated interruption capacity of site i, I SCi is the three-phase short-circuit current value of site i.

[0028] Optionally, the calculation formula for the network loss index w2 of the excessive site area is as follows:

[0029]

[0030] Among them, K CL To introduce the network loss index of the site area where w2 exceeds the standard, n2 is the number of related partitions, ΔP LLi is the active power loss of partition i.

[0031] Optionally, the unit capacity cost indicator w3 is calculated as follows:

[0032]

[0033] Among them, K UC In order to introduce the unit capacity cost indicator w3, n3 is the number of installed fault current limiters, S FiThe capacity of the fault current limiter installed to limit the short-circuit current at station i, C Ti is the corresponding device investment, I Ti is the change in short-circuit current at exceeding-standard site i.

[0034] Optionally, the contrast matrix C formula is as follows:

[0035]

[0036] in, is the element value, n=1,2,3;

[0037] The comparison matrix C is normalized and the calculation formula is as follows:

[0038]

[0039] Based on C ij Determine the index value C K , the calculation formula is as follows:

[0040]

[0041] In another aspect, the present invention further proposes a short-circuit current limiter configuration optimization system based on a sensitivity index, comprising:

[0042] an initialization unit, configured to construct power grid research data, obtain a first fault current limiter original installation plan F1 based on the power grid research data, generate a second fault current limiter installation plan F2 and a third fault current limiter installation plan F3 based on the power grid research data, and establish a short-circuit current limiting plan evaluation index set W based on a sensitivity index;

[0043] A calculation unit is configured to calculate the index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 based on the short-circuit current limiting scheme evaluation index set W. k ;

[0044] The optimization unit is used to select the index value C in the first fault current limiter original installation plan F1, the second fault current limiter installation plan F2 and the third fault current limiter installation plan F3 k The highest one is taken as the optimized solution, and the short-circuit current limiter is configured according to the optimized solution.

[0045] Optionally, based on the power grid research data, generating a second fault current limiter installation plan F2 and a third fault current limiter installation plan F3 includes:

[0046] Based on the power grid research data, calculate the short-circuit current of the site in the power grid;

[0047] The sites where the short-circuit current exceeds 90% of the rated interrupting capacity are selected to form the short-circuit current exceeding site set S;

[0048] Calculate the short-circuit current composition ratio of all sites in the short-circuit current exceeding site set S, and group the branch lines with the top four contribution ratios into a set T;

[0049] Calculate the short-circuit current contribution index of any branch in the set T to the node in the short-circuit current exceeding site set S, and form the short-circuit current contribution index matrix R;

[0050] Calculate the sensitivity index of the impact of any branch in the set T on the short-circuit current of the node in the short-circuit current exceeding site set S, and form the short-circuit current sensitivity index matrix L;

[0051] Select the site with the largest short-circuit current from the set S of sites with excessive short-circuit current, install a fault current limiter on the branch with the highest corresponding sensitivity index, and adjust the installed capacity;

[0052] removing the branch on which the fault current limiter is installed from the short-circuit current sensitivity index matrix L to adjust the short-circuit current sensitivity index matrix L;

[0053] Based on the adjusted short-circuit current sensitivity index matrix L, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked, and when it is determined that no site exceeds the standard, a second fault current limiter installation plan F2 is generated;

[0054] Select the site with the largest short-circuit current from the set S of sites with excessive short-circuit current, install a fault current limiter on the branch with the highest corresponding contribution index, and adjust the installed capacity;

[0055] The branch on which the fault current limiter is installed is removed from the short-circuit current contribution index matrix R to adjust the short-circuit current contribution index matrix R;

[0056] Based on the adjusted short-circuit current contribution index matrix R, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked. When it is determined that no exceeding site exists, a third fault current limiter installation plan F3 is generated.

[0057] Optionally, based on the adjusted short-circuit current sensitivity index matrix L, the short-circuit current of all sites in the short-circuit current exceeding site set S is checked. If there is a site exceeding the standard, the site with the largest short-circuit current in the short-circuit current exceeding site set S is selected, and the branch with the highest sensitivity index L corresponding to the site is installed with a fault current limiter, and the installation capacity is adjusted again.

[0058] Optionally, based on the adjusted short-circuit current contribution index matrix R, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked. If there is an exceeding site, the site with the largest short-circuit current in the short-circuit current exceeding site set S is selected, and the branch with the highest corresponding contribution index is installed with a fault current limiter, and the installation capacity is adjusted again.

[0059] Optionally, based on the short-circuit current limiting scheme evaluation index set W, the index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 are calculated. k ,include:

[0060] Calculating the values ​​of the elements of the short-circuit current limiting scheme evaluation index set W for the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2, and the third fault current limiter installation scheme F3 to generate a short-circuit current limiting index comparison matrix C;

[0061] Based on the comparison matrix C, the index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 are calculated. k .

[0062] Optionally, the short-circuit current limiting scheme evaluation index set W includes: w1 exceeding the standard site short-circuit current margin index w1, w2 exceeding the standard site regional network loss index w2 and w3 unit capacity cost index w3.

[0063] Optionally, the calculation formula for the short-circuit current margin index w1 of the exceeding-standard site is as follows:

[0064]

[0065] Among them, K SC In order to introduce the short-circuit current margin index of the site with exceeded standards, n1 is the number of sites with exceeded standards, and I RCi is the rated interruption capacity of site i, I SCi is the three-phase short-circuit current value of site i.

[0066] Optionally, the calculation formula for the network loss index w2 of the excessive site area is as follows:

[0067]

[0068] Among them, K CL To introduce the network loss index of the site area where w2 exceeds the standard, n2 is the number of related partitions, ΔP LLi is the active power loss of partition i.

[0069] Optionally, the unit capacity cost indicator w3 is calculated as follows:

[0070]

[0071] Among them, K UC In order to introduce the unit capacity cost indicator w3, n3 is the number of installed fault current limiters, S Fi The capacity of the fault current limiter installed to limit the short-circuit current at station i, C Ti is the corresponding device investment, I Ti is the change in short-circuit current at exceeding-standard site i.

[0072] Optionally, the contrast matrix C formula is as follows:

[0073]

[0074] in, is the element value, n=1,2,3;

[0075] The comparison matrix C is normalized and the calculation formula is as follows:

[0076]

[0077] Based on C ij Determine the index value C K , the calculation formula is as follows:

[0078]

[0079] In yet another aspect, the present invention further provides a computing device comprising: one or more processors;

[0080] a processor for executing one or more programs;

[0081] When the one or more programs are executed by the one or more processors, the above-described method is implemented.

[0082] In another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, the method described above is implemented.

[0083] Compared with the prior art, the present invention has the following beneficial effects:

[0084] The present invention provides a short-circuit current limiter configuration optimization method based on sensitivity index, comprising: building power grid research data, obtaining a first fault current limiter original installation plan F1 based on the power grid research data, generating a second fault current limiter installation plan F2 and a third fault current limiter installation plan F3 based on the power grid research data, and establishing a short-circuit current limiting scheme evaluation index set W based on sensitivity index; and calculating the index values ​​C corresponding to the first fault current limiter original installation plan F1, the second fault current limiter installation plan F2, and the third fault current limiter installation plan F3, respectively, based on the short-circuit current limiting scheme evaluation index set W. k ; Select the index value C in the first fault current limiter original installation plan F1, the second fault current limiter installation plan F2 and the third fault current limiter installation plan F3 k The highest one is taken as the optimization scheme, and the short-circuit current limiter is configured according to the optimization scheme. The present invention can significantly reduce the short-circuit current of the site without changing the existing structure of the power grid, thereby ensuring the stable operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0085] Figure 1 is a flow chart of the method of the present invention;

[0086] Figure 2 is a flow chart of an embodiment of the method of the present invention;

[0087] Figure 3 It is a structural diagram of the system of the present invention. DETAILED DESCRIPTION

[0088] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a thorough and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0089] Unless otherwise specified, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it is understood that terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0090] Example 1:

[0091] The present invention proposes a short-circuit current limiter configuration optimization method based on sensitivity index, such as Figure 1 Shown, including:

[0092] Step 1: Build power grid research data, obtain the original installation plan F1 of the first fault current limiter based on the power grid research data, generate the second fault current limiter installation plan F2 and the third fault current limiter installation plan F3 based on the power grid research data, and establish a short-circuit current limiting plan evaluation index set W based on the sensitivity index;

[0093] Step 2: Based on the short-circuit current limiting scheme evaluation index set W, calculate the index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 respectively. k ;

[0094] Step 3: Select the index value C in the first fault current limiter original installation plan F1, the second fault current limiter installation plan F2 and the third fault current limiter installation plan F3. k The highest one is taken as the optimized solution, and the short-circuit current limiter is configured according to the optimized solution.

[0095] Wherein, based on the power grid research data, generating a second fault current limiter installation scheme F2 and a third fault current limiter installation scheme F3 includes:

[0096] Based on the power grid research data, calculate the short-circuit current of the site in the power grid;

[0097] The sites where the short-circuit current exceeds 90% of the rated interrupting capacity are selected to form the short-circuit current exceeding site set S;

[0098] Calculate the short-circuit current composition ratio of all sites in the short-circuit current exceeding site set S, and group the branch lines with the top four contribution ratios into a set T;

[0099] Calculate the short-circuit current contribution index of any branch in the set T to the node in the short-circuit current exceeding site set S, and form the short-circuit current contribution index matrix R;

[0100] Calculate the sensitivity index of the impact of any branch in the set T on the short-circuit current of the node in the short-circuit current exceeding site set S, and form the short-circuit current sensitivity index matrix L;

[0101] Select the site with the largest short-circuit current from the set S of sites with excessive short-circuit current, install a fault current limiter on the branch with the highest corresponding sensitivity index, and adjust the installed capacity;

[0102] removing the branch on which the fault current limiter is installed from the short-circuit current sensitivity index matrix L to adjust the short-circuit current sensitivity index matrix L;

[0103] Based on the adjusted short-circuit current sensitivity index matrix L, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked, and when it is determined that no site exceeds the standard, a second fault current limiter installation plan F2 is generated;

[0104] Select the site with the largest short-circuit current from the set S of sites with excessive short-circuit current, install a fault current limiter on the branch with the highest corresponding contribution index, and adjust the installed capacity;

[0105] The branch on which the fault current limiter is installed is removed from the short-circuit current contribution index matrix R to adjust the short-circuit current contribution index matrix R;

[0106] Based on the adjusted short-circuit current contribution index matrix R, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked. When it is determined that no exceeding site exists, a third fault current limiter installation plan F3 is generated.

[0107] Among them, based on the adjusted short-circuit current sensitivity index matrix L, the short-circuit current of all sites in the short-circuit current exceeding site set S is checked. If there is a site with an exceeding site, the site with the largest short-circuit current in the short-circuit current exceeding site set S is selected, and the branch with the highest sensitivity index L corresponding to the site is installed with a fault current limiter, and the installation capacity is adjusted again.

[0108] Among them, based on the adjusted short-circuit current contribution index matrix R, the short-circuit current of all sites in the short-circuit current exceeding site set S is checked. If there is a site with an exceeding site, the site with the largest short-circuit current in the short-circuit current exceeding site set S is selected, and the branch with the highest corresponding contribution index is installed with a fault current limiter, and the installation capacity is adjusted again.

[0109] Among them, based on the short-circuit current limiting scheme evaluation index set W, the index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 are calculated respectively. k ,include:

[0110] Calculating the values ​​of the elements of the short-circuit current limiting scheme evaluation index set W for the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2, and the third fault current limiter installation scheme F3 to generate a short-circuit current limiting index comparison matrix C;

[0111] Based on the comparison matrix C, the index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 are calculated. k .

[0112] The short-circuit current limiting scheme evaluation index set W includes: the short-circuit current margin index w1 of the site exceeding the standard w1, the regional network loss index w2 of the site exceeding the standard w2, and the unit capacity cost index w3.

[0113] The calculation formula for the short-circuit current margin index w1 of the exceeding-standard site is as follows:

[0114]

[0115] Among them, K SC In order to introduce the short-circuit current margin index of the site with exceeded standards, n1 is the number of sites with exceeded standards, and I RCi is the rated interruption capacity of site i, I SCi is the three-phase short-circuit current value of site i.

[0116] The calculation formula for the network loss index w2 in the excessive site area is as follows:

[0117]

[0118] Among them, K CL To introduce the network loss index of the site area where w2 exceeds the standard, n2 is the number of related partitions, ΔP LLi is the active power loss of partition i.

[0119] The calculation formula of the unit capacity cost indicator w3 is as follows:

[0120]

[0121] Among them, K UC In order to introduce the unit capacity cost indicator w3, n3 is the number of installed fault current limiters, S Fi The capacity of the fault current limiter installed to limit the short-circuit current at station i, C Ti is the corresponding device investment, I Ti is the change in short-circuit current at exceeding-standard site i.

[0122] Among them, the contrast matrix C formula is as follows:

[0123]

[0124] in, is the element value, n=1,2,3;

[0125] The comparison matrix C is normalized and the calculation formula is as follows:

[0126]

[0127] Based on C ij Determine the index value C K, the calculation formula is as follows:

[0128]

[0129] The present invention will be further described below in conjunction with embodiments:

[0130] Example process as shown Figure 2 As shown, specifically including:

[0131] (1) Build power grid research data;

[0132] (2) Calculate the short-circuit current of the stations in the network;

[0133] (3) Select stations whose short-circuit current exceeds 90% of the rated interrupting capacity to form a set S;

[0134] (4) Calculate the short-circuit current composition ratio of all sites in the short-circuit current exceeding site set S, and group the branch lines with the top four contribution ratios into a set T;

[0135] (5) Calculate the short-circuit current contribution index of any branch in the set T to the nodes in the set S, and form the short-circuit current contribution index matrix R;

[0136] (6) Calculate the sensitivity index of the impact of any branch in the set T on the short-circuit current of the node in the set S, and form the short-circuit current sensitivity index matrix L;

[0137] (7) Select the branch with the highest sensitivity index L corresponding to the station with the largest short-circuit current in the set S to install a fault current limiter, and adjust the capacity to the optimal value;

[0138] (8) Remove the branch with the fault current limiter installed in (7) from the matrix L and adjust L;

[0139] (9) Check the short-circuit currents of all sites in the site set S where the short-circuit current exceeds the standard for the fault current limiter scheme again. If there are still sites that exceed the standard, return to (7);

[0140] (10) Generate a fault current limiter installation plan F2;

[0141] (11) Select the branch with the highest contribution index R corresponding to the station with the largest short-circuit current in the set S and install a fault current limiter, and adjust the capacity to the optimal value;

[0142] (12) Remove the branch with the fault current limiter installed in (11) from the matrix R and adjust R;

[0143] (13) Check the short-circuit currents of all sites in the site set S where the short-circuit current exceeds the standard for the fault current limiter scheme again. If there are still sites that exceed the standard, return to (11);

[0144] (14) Generate a fault current limiter installation plan F3;

[0145] (15) Establishing a short-circuit current limiting scheme evaluation index set W;

[0146] (16) Calculate the element values ​​of the short-circuit current limiting scheme evaluation index set W of the original scheme F1, the fault current limiter scheme F2, and the fault current limiter scheme F3 to form a short-circuit current limiting index comparison matrix C;

[0147] (17) Process the data in the index comparison matrix C and finally obtain the index values ​​C corresponding to the original solution F1, the fault current limiter solution F2, and the fault current limiter solution F3. k ;

[0148] (18) The solution with the highest index value is selected as the final recommended short-circuit current limiting solution.

[0149] Wherein, in the step (5): the corresponding element r in the short-circuit current contribution matrix R of the branch ij to the short-circuit current of the node i ij equal:

[0150]

[0151] Where I fij is the three-phase short-circuit current of branch ij, I fi is the three-phase short-circuit current of node i, n is the number of sites in set S, and m is the number of branches in set T.

[0152] The dimension of the formed sensitivity index matrix R is m×n.

[0153] Wherein, in the step (6): the corresponding element l in the sensitivity index matrix L of the influence of the impedance of the branch ij on the short-circuit current of the node i ij equal:

[0154]

[0155] Where I fi is the three-phase short-circuit current at node i, Z ij is the impedance of line ij, n is the number of sites in set S, and m is the number of branches in set T.

[0156] The resistance value of high voltage line is usually much smaller than the reactance value, so the element l ij It can be approximately equal to:

[0157]

[0158] Where I fi is the three-phase short-circuit current of node i, x ij is the reactance of line j.

[0159] The dimension of the formed sensitivity index matrix L is m×n.

[0160] Wherein, in the steps (7) and (11): it is assumed that the initial value of the fault current limiter installed in branch ij is equal to 1 ohm, and the initial per-unit value of the fault current limiter is equal to:

[0161]

[0162] Where x' fij0 is the initial nominal value of the fault current limiter installed on line ij, U iN is the rated voltage of line i, S d is the system capacity.

[0163] Assume the upper limit value of the fault current limiter is x fijmax Equal to 40 ohms, the upper limit value per unit of the fault current limiter is equal to:

[0164]

[0165] Where x' fijmax is the nominal upper limit value of the fault current limiter installed on line ij, U iN is the rated voltage of line i, S d is the system capacity.

[0166] Calculate whether the short-circuit current of node i meets the requirements after installing the fault current limiter. If not, the value of the fault current limiter x fijk equal:

[0167]

[0168] Where x fij(k-1) is the last calculated value of the fault current limiter capacity, x fijmax is the upper limit of the fault current limiter capacity.

[0169] If satisfied, the installed fault current limiter capacity value x fijk equal:

[0170]

[0171] Where x fij0 is the initial value of the fault current limiter, x fij(k-1) This is the last calculated value of the fault current limiter capacity.

[0172] Repeat the above calculation until the following is satisfied:

[0173] |x fijk -x fij(k-1) |≤ε(k≥1) (9)

[0174] In the formula, the value of ε is 0.001.

[0175] The value of the fault current limiter installed on branch ij is equal to:

[0176] x fij =x fijk (10)

[0177] Where x fijk is the final value of the fault current limiter capacity.

[0178] Wherein, in the step (15): the short-circuit current limiting scheme evaluation index set W is introduced, and the calculation formula is:

[0179] W={w1,w2,w3,......w k} (16)

[0180] Where w k They represent different indicators respectively, where w1 is the short-circuit current margin indicator of the exceeding site, w2 is the regional network loss indicator of the exceeding site, and w3 is the unit capacity cost indicator.

[0181] Wherein, in the step (16): the calculation formula for the short-circuit current margin index of the w1 exceeding the standard site is introduced as follows:

[0182]

[0183] Where I RCi is the rated interruption capacity of site i, I SCi is the three-phase short-circuit current value of site i, and n is the number of sites that exceed the standard.

[0184] The network loss index of the w2 exceeding-standard site area is the sum of the network losses of all areas related to the lines with added short-circuit current limiting measures.

[0185]

[0186] Where ΔP LLi is the active power loss of partition i, and m is the number of related partitions.

[0187] The calculation formula for the w3 unit capacity cost indicator is:

[0188]

[0189] Where S Fi The capacity of the fault current limiter installed to limit the short-circuit current at station i, C Ti is the corresponding device investment, I Ti is the change in short-circuit current at exceeding site i, and n is the number of installed fault current limiters.

[0190] Wherein, in the step (10): the short-circuit current limiting scheme F k The comparison matrix C of the evaluation index set is expressed as:

[0191]

[0192] The standardized processing method of the short-circuit current limit evaluation index comparison matrix C is:

[0193]

[0194] Plan F k The corresponding short-circuit current limit evaluation index value C k for:

[0195]

[0196] The following takes a certain power grid as an example to further describe the specific implementation of the present invention in detail.

[0197] The specific implementation includes the following steps:

[0198] Data on typical ways to build power grids.

[0199] Calculate the site short-circuit current. The sites with short-circuit current exceeding 90% of the rated capacity are shown in Table 1. The set of sites with excessive short-circuit current, S, is as follows:

[0200] S=[HJ50 MD50 YZ60]

[0201] The top four branches contributing to the short-circuit current at the site are shown in Table 2. The short-circuit current contributing branch set T is as follows:

[0202]

[0203] Calculate the short-circuit current contribution index of any branch in set T to the nodes in set S, as shown in Table 3. The short-circuit current contribution index matrix R is as follows:

[0204]

[0205] The sensitivity index of the impact of any branch in set T on the short-circuit current of the nodes in set S is calculated, as shown in Table 4. The short-circuit current sensitivity index matrix L is as follows:

[0206]

[0207] The branches HJ50-HH50II and HJ50-HH50I with the highest sensitivity index corresponding to the site HJ50 with the largest short-circuit current in the set S are selected to install fault current limiters. After algorithm iteration, the capacity is adjusted to the optimal value of 14 ohms.

[0208] After installing 14-ohm fault current limiters on HJ50-HH50II and HJ50-HH50I, the short-circuit current of the site exceeding the standard set S was checked, and it was found that the short-circuit current of the MD50 and YZ50 busbars still exceeded the standard.

[0209] The branches MD50-YZ50II and MD50-YZ50I with the highest sensitivity corresponding to the site MD50 with the largest short-circuit current in the set S are selected to install fault current limiters. After algorithm iteration, the capacity is adjusted to the optimal value of 3 ohms.

[0210] After verifying the short-circuit currents of the stations in set S where the short-circuit current exceeds the standard, the HJ50-HH50II and HJ50-HH50I are equipped with 14-ohm fault current limiters, and the MD50-YZ50II and MD50-YZ50I are equipped with 3-ohm fault current limiters, the short-circuit currents of all buses are within the standard. This results in fault current limiter solution F2: 14-ohm fault current limiters are installed on the HJ50-HH50II and HJ50-HH50I, and 3-ohm fault current limiters are installed on the MD50-YZ50II and MD50-YZ50I.

[0211] The branches HJ50-ZX50II and HJ50-ZX50I with the highest contribution index corresponding to the site HJ50 with the largest short-circuit current in the set S are selected to install fault current limiters. After algorithm iteration, the capacity is adjusted to the optimal value of 14 ohms.

[0212] After installing 14-ohm fault current limiters on HJ50-ZX50II and HJ50-ZX50I, the short-circuit current of the site exceeding the standard set S was checked, and it was found that the short-circuit current of the MD50 and YZ50 busbars still exceeded the standard.

[0213] The branches MD50-YZ50II and MD50-YZ50I with the highest contribution index corresponding to the site MD50 with the largest short-circuit current in the set S are selected to install fault current limiters. After algorithm iteration, the capacity is adjusted to the optimal value of 3 ohms.

[0214] After verifying the short-circuit currents of the sites in the set S where the short-circuit current exceeds the standard, the HJ50-ZX50II and HJ50-ZX50I are equipped with 14-ohm fault current limiters, and the MD50-YZ50II and MD50-YZ50I are equipped with 3-ohm fault current limiters, the short-circuit currents of all buses are within the standard. This results in fault current limiter solution F3: 14-ohm fault current limiters are installed on the HJ50-ZX50II and HJ50-ZX50I, and 3-ohm fault current limiters are installed on the MD50-YZ50II and MD50-YZ50I.

[0215] The short-circuit current limiting scheme evaluation index set W is established, and the element values ​​of the index set W of the original scheme F1, the fault current limiter scheme F2, and the fault current limiter scheme F3 are combined to form an index comparison matrix C, as shown below:

[0216]

[0217] Process the data in the index comparison matrix C and finally obtain the index values ​​C corresponding to the original scheme F1, the flexible DC partition scheme F2 and the UPFC partition scheme F3. k .

[0218]

[0219] The calculation results are: C1 = 2.3252, C2 = 2.9936, C3 = 3.0743

[0220] According to the comprehensive evaluation index value C of the short-circuit current limiting scheme k , determine the plan.

[0221] The calculation results show that C3>C2>C1, so F3 is the best and F2 is the second best. Therefore, F3 is recommended: install a 14-ohm fault current limiter on the HJ50-ZX50II and HJ50-ZX50I, and install a 3-ohm fault current limiter on the MD50-YZ50II and MD50-YZ50I.

[0222] Table 1

[0223] Site Name Three-phase short-circuit current Rated interrupting capacity HJ50 61.57 63 MD50 58.3 63 YZ50 57.32 63

[0224] Table 2

[0225]

[0226] Table 3

[0227] Branch name HJ50 MD50 YZ50 HJ50-ZX50 II back 0.158 0 0 HJ50-ZX50 I return 0.158 0 0 HJ50-HH50 II back 0.146 0 0 HJ50-HH50 I return 0.146 0 0 MD50-YZ50 I return 0 0.202 0.214 MD50-YZ50 II back 0 0.202 0.214 MD50-MS50 II back 0 0.136 0 MD50-MS50 I return 0 0.136 0 YZ50-JH50 0 0 0.194 YZ50-HD50 0 0 0.132

[0228] Table 4

[0229] Branch name HJ50 MD50 YZ50 HJ50-ZX50 II back 0.126 0.001 0.001 HJ50-ZX50 I return 0.126 0.001 0.001 HJ50-HH50 II back 0.172 0.001 0.001 HJ50-HH50 I return 0.172 0.001 0.001 MD50-YZ50 I return 0.002 0.253 0.271 MD50-YZ50 II back 0.002 0.253 0.271 MD50-MS50 II back 0.004 0.126 0.055 MD50-MS50 I return 0.004 0.126 0.055 YZ50-JH50 0.001 0.113 0.249 YZ50-HD50 0.001 0.056 0.127

[0230] Example 2:

[0231] The present invention also proposes a short-circuit current limiter configuration optimization system 200 based on sensitivity index, such as Figure 3 Shown, including:

[0232] Initialization unit 201 is used to build power grid research data, obtain a first fault current limiter original installation plan F1 based on the power grid research data, generate a second fault current limiter installation plan F2 and a third fault current limiter installation plan F3 based on the power grid research data, and establish a short-circuit current limiting plan evaluation index set W based on the sensitivity index;

[0233] The calculation unit 202 is configured to calculate the index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 based on the short-circuit current limiting scheme evaluation index set W. k ;

[0234] The optimization unit 203 is configured to select the index value C in the first fault current limiter original installation plan F1, the second fault current limiter installation plan F2 and the third fault current limiter installation plan F3. k The highest one is taken as the optimized solution, and the short-circuit current limiter is configured according to the optimized solution.

[0235] Wherein, based on the power grid research data, generating a second fault current limiter installation scheme F2 and a third fault current limiter installation scheme F3 includes:

[0236] Based on the power grid research data, calculate the short-circuit current of the site in the power grid;

[0237] The sites where the short-circuit current exceeds 90% of the rated interrupting capacity are selected to form the short-circuit current exceeding site set S;

[0238] Calculate the short-circuit current composition ratio of all sites in the short-circuit current exceeding site set S, and group the branch lines with the top four contribution ratios into a set T;

[0239] Calculate the short-circuit current contribution index of any branch in the set T to the node in the short-circuit current exceeding site set S, and form the short-circuit current contribution index matrix R;

[0240] Calculate the sensitivity index of the impact of any branch in the set T on the short-circuit current of the node in the short-circuit current exceeding site set S, and form the short-circuit current sensitivity index matrix L;

[0241] Select the site with the largest short-circuit current from the set S of sites with excessive short-circuit current, install a fault current limiter on the branch with the highest corresponding sensitivity index, and adjust the installed capacity;

[0242] removing the branch on which the fault current limiter is installed from the short-circuit current sensitivity index matrix L to adjust the short-circuit current sensitivity index matrix L;

[0243] Based on the adjusted short-circuit current sensitivity index matrix L, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked, and when it is determined that no site exceeds the standard, a second fault current limiter installation plan F2 is generated;

[0244] Select the site with the largest short-circuit current from the set S of sites with excessive short-circuit current, install a fault current limiter on the branch with the highest corresponding contribution index, and adjust the installed capacity;

[0245] The branch on which the fault current limiter is installed is removed from the short-circuit current contribution index matrix R to adjust the short-circuit current contribution index matrix R;

[0246] Based on the adjusted short-circuit current contribution index matrix R, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked. When it is determined that no exceeding site exists, a third fault current limiter installation plan F3 is generated.

[0247] Among them, based on the adjusted short-circuit current sensitivity index matrix L, the short-circuit current of all sites in the short-circuit current exceeding site set S is checked. If there is a site with an exceeding site, the site with the largest short-circuit current in the short-circuit current exceeding site set S is selected, and the branch with the highest sensitivity index L corresponding to the site is installed with a fault current limiter, and the installation capacity is adjusted again.

[0248] Among them, based on the adjusted short-circuit current contribution index matrix R, the short-circuit current of all sites in the short-circuit current exceeding site set S is checked. If there is a site with an exceeding site, the site with the largest short-circuit current in the short-circuit current exceeding site set S is selected, and the branch with the highest corresponding contribution index is installed with a fault current limiter, and the installation capacity is adjusted again.

[0249] Among them, based on the short-circuit current limiting scheme evaluation index set W, the index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 are calculated respectively. k ,include:

[0250] Calculating the values ​​of the elements of the short-circuit current limiting scheme evaluation index set W for the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2, and the third fault current limiter installation scheme F3 to generate a short-circuit current limiting index comparison matrix C;

[0251] Based on the comparison matrix C, the index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 are calculated. k .

[0252] The short-circuit current limiting scheme evaluation index set W includes: the short-circuit current margin index w1 of the site exceeding the standard w1, the regional network loss index w2 of the site exceeding the standard w2, and the unit capacity cost index w3.

[0253] The calculation formula of the short-circuit current margin index w1 of the w1-exceeding-standard site is as follows:

[0254]

[0255] Among them, K SC In order to introduce the short-circuit current margin index of the site with exceeded standards, n1 is the number of sites with exceeded standards, and I RCi is the rated interruption capacity of site i, I SCi is the three-phase short-circuit current value of site i.

[0256] The calculation formula for the network loss index w2 in the excessive site area is as follows:

[0257]

[0258] Among them, K CL To introduce the network loss index of the site area where w2 exceeds the standard, n2 is the number of related partitions, ΔP LLi is the active power loss of partition i.

[0259] The calculation formula of the unit capacity cost indicator w3 is as follows:

[0260]

[0261] Among them, K UC In order to introduce the unit capacity cost indicator w3, n3 is the number of installed fault current limiters, S Fi The capacity of the fault current limiter installed to limit the short-circuit current at station i, C Ti is the corresponding device investment, I Ti is the change in short-circuit current at exceeding-standard site i.

[0262] Among them, the contrast matrix C formula is as follows:

[0263]

[0264] in, is the element value, n=1,2,3;

[0265] The comparison matrix C is normalized and the calculation formula is as follows:

[0266]

[0267] Based on C ij Determine the index value C K, the calculation formula is as follows:

[0268]

[0269] The present invention addresses the problem of excessive short-circuit current faced by the DC receiving-end power grid. By installing a fault current limiter on the line, the short-circuit current at the site is controlled. Finally, a relatively reasonable solution is selected by comparing the short-circuit current reduction effect and economic efficiency of different solutions. This solution can significantly reduce the short-circuit current at the site without changing the existing structure of the power grid, thereby ensuring the stable operation of the power grid.

[0270] Example 3:

[0271] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc., which is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of the method in the above embodiment.

[0272] Example 4:

[0273] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It can be understood that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space that stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space. These instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiment.

[0274] It will be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention may be implemented in various computer languages, for example, the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0275] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0276] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0277] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0278] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0279] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A short-circuit current limiter configuration optimization method based on sensitivity index, characterized in that: The method comprises: Building power grid research data, obtaining a first fault current limiter original installation plan F1 based on the power grid research data, generating a second fault current limiter installation plan F2 and a third fault current limiter installation plan F3 based on the power grid research data, and establishing a short-circuit current limiting plan evaluation index set W based on a sensitivity index; Based on the short-circuit current limiting scheme evaluation index set W, the index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 are calculated. k ; Select the index value C in the original installation plan F1 of the first fault current limiter, the second fault current limiter installation plan F2 and the third fault current limiter installation plan F3 k The highest one is taken as the optimization solution, and the short-circuit current limiter is configured according to the optimization solution; The generating, based on the power grid research data, a second fault current limiter installation scheme F2 and a third fault current limiter installation scheme F3, comprises: Based on the power grid research data, calculate the short-circuit current of the site in the power grid; The sites where the short-circuit current exceeds 90% of the rated interrupting capacity are selected to form the short-circuit current exceeding site set S; Calculate the short-circuit current composition ratio of all sites in the short-circuit current exceeding site set S, and group the branch lines with the top four contribution ratios into a set T; Calculate the short-circuit current contribution index of any branch in the set T to the node in the short-circuit current exceeding site set S, and form the short-circuit current contribution index matrix R; Calculate the sensitivity index of the impact of any branch in the set T on the short-circuit current of the node in the short-circuit current exceeding site set S, and form the short-circuit current sensitivity index matrix L; Select the site with the largest short-circuit current from the set S of sites with excessive short-circuit current, install a fault current limiter on the branch with the highest corresponding sensitivity index, and adjust the installed capacity; removing the branch on which the fault current limiter is installed from the short-circuit current sensitivity index matrix L to adjust the short-circuit current sensitivity index matrix L; Based on the adjusted short-circuit current sensitivity index matrix L, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked, and when it is determined that no site exceeds the standard, a second fault current limiter installation plan F2 is generated; Select the site with the largest short-circuit current from the set S of sites with excessive short-circuit current, install a fault current limiter on the branch with the highest corresponding contribution index, and adjust the installed capacity; The branch on which the fault current limiter is installed is removed from the short-circuit current contribution index matrix R to adjust the short-circuit current contribution index matrix R; Based on the adjusted short-circuit current contribution index matrix R, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked. When it is determined that no exceeding site exists, a third fault current limiter installation plan F3 is generated.

2. The method according to claim 1, characterized in that Based on the adjusted short-circuit current sensitivity index matrix L, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked. If there is a site with an exceeding short-circuit current, the site with the largest short-circuit current in the short-circuit current exceeding site set S is selected, and the branch with the highest sensitivity index L corresponding to the site is installed with a fault current limiter, and the installation capacity is adjusted again.

3. The method according to claim 1, characterized in that Based on the adjusted short-circuit current contribution index matrix R, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked. If there is a site with an exceeding short-circuit current, the site with the largest short-circuit current in the short-circuit current exceeding site set S is selected, and the branch with the highest corresponding contribution index is installed with a fault current limiter, and the installation capacity is adjusted again.

4. The method according to claim 1, wherein The index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 are calculated based on the short-circuit current limiting scheme evaluation index set W. k ,include: Calculating the values ​​of the elements of the short-circuit current limiting scheme evaluation index set W for the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2, and the third fault current limiter installation scheme F3 to generate a short-circuit current limiting index comparison matrix C; Based on the comparison matrix C, the index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 are calculated. k .

5. The method according to claim 4, characterized in that The short-circuit current limiting scheme evaluation index set W includes: w1 exceeding the standard site short-circuit current margin index w1, w2 exceeding the standard site regional network loss index w2 and w3 unit capacity cost index w3.

6. The method according to claim 5, characterized in that The calculation formula of the short-circuit current margin index w1 of the exceeding-standard site is as follows: Among them, K SC In order to introduce the short-circuit current margin index of the site with exceeded standards, n1 is the number of sites with exceeded standards, and I RCi is the rated interruption capacity of site i, I SCi is the three-phase short-circuit current value of site i.

7. The method according to claim 5, characterized in that The calculation formula for the network loss index w2 of the excessive site area is as follows: Among them, K CL To introduce the network loss index of the site area where w2 exceeds the standard, n2 is the number of related partitions, ΔP LLi is the active power loss of partition i.

8. The method according to claim 5, characterized in that The calculation formula of the unit capacity cost indicator w3 is as follows: Among them, K UC In order to introduce the unit capacity cost indicator w3, n3 is the number of installed fault current limiters, S Fi The capacity of the fault current limiter installed to limit the short-circuit current at station i, C Ti is the corresponding device investment, I Ti is the change in short-circuit current at exceeding-standard site i.

9. The method according to claim 4, characterized in that The contrast matrix C formula is as follows: in, is the element value, n=1,2,3; The comparison matrix C is normalized and the calculation formula is as follows: Based on C ij Determine the index value C K , the calculation formula is as follows:

10. A short-circuit current limiter configuration optimization system based on sensitivity index, characterized in that: The system comprises: an initialization unit, configured to construct power grid research data, obtain a first fault current limiter original installation plan F1 based on the power grid research data, generate a second fault current limiter installation plan F2 and a third fault current limiter installation plan F3 based on the power grid research data, and establish a short-circuit current limiting plan evaluation index set W based on a sensitivity index; A calculation unit is configured to calculate the index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 based on the short-circuit current limiting scheme evaluation index set W. k ; The optimization unit is used to select the index value C in the first fault current limiter original installation plan F1, the second fault current limiter installation plan F2 and the third fault current limiter installation plan F3 k The highest one is taken as the optimization solution, and the short-circuit current limiter is configured according to the optimization solution; The generating, based on the power grid research data, a second fault current limiter installation scheme F2 and a third fault current limiter installation scheme F3, comprises: Based on the power grid research data, calculate the short-circuit current of the site in the power grid; The sites where the short-circuit current exceeds 90% of the rated interrupting capacity are selected to form the short-circuit current exceeding site set S; Calculate the short-circuit current composition ratio of all sites in the short-circuit current exceeding site set S, and group the branch lines with the top four contribution ratios into a set T; Calculate the short-circuit current contribution index of any branch in the set T to the node in the short-circuit current exceeding site set S, and form the short-circuit current contribution index matrix R; Calculate the sensitivity index of the impact of any branch in the set T on the short-circuit current of the node in the short-circuit current exceeding site set S, and form the short-circuit current sensitivity index matrix L; Select the site with the largest short-circuit current from the set S of sites with excessive short-circuit current, install a fault current limiter on the branch with the highest corresponding sensitivity index, and adjust the installed capacity; removing the branch on which the fault current limiter is installed from the short-circuit current sensitivity index matrix L to adjust the short-circuit current sensitivity index matrix L; Based on the adjusted short-circuit current sensitivity index matrix L, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked, and when it is determined that no site exceeds the standard, a second fault current limiter installation plan F2 is generated; Select the site with the largest short-circuit current from the set S of sites with excessive short-circuit current, install a fault current limiter on the branch with the highest corresponding contribution index, and adjust the installed capacity; The branch on which the fault current limiter is installed is removed from the short-circuit current contribution index matrix R to adjust the short-circuit current contribution index matrix R; Based on the adjusted short-circuit current contribution index matrix R, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked. When it is determined that no exceeding site exists, a third fault current limiter installation plan F3 is generated.

11. The system according to claim 10, wherein: Based on the adjusted short-circuit current sensitivity index matrix L, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked. If there is a site with an exceeding short-circuit current, the site with the largest short-circuit current in the short-circuit current exceeding site set S is selected, and the branch with the highest sensitivity index L corresponding to the site is installed with a fault current limiter, and the installation capacity is adjusted again.

12. The system according to claim 10, wherein: Based on the adjusted short-circuit current contribution index matrix R, the short-circuit currents of all sites in the short-circuit current exceeding site set S are checked. If there is a site with an exceeding short-circuit current, the site with the largest short-circuit current in the short-circuit current exceeding site set S is selected, and the branch with the highest corresponding contribution index is installed with a fault current limiter, and the installation capacity is adjusted again.

13. The system according to claim 10, wherein: The index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 are calculated based on the short-circuit current limiting scheme evaluation index set W. k ,include: Calculating the values ​​of the elements of the short-circuit current limiting scheme evaluation index set W for the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2, and the third fault current limiter installation scheme F3 to generate a short-circuit current limiting index comparison matrix C; Based on the comparison matrix C, the index values ​​C corresponding to the first fault current limiter original installation scheme F1, the second fault current limiter installation scheme F2 and the third fault current limiter installation scheme F3 are calculated. k .

14. The system according to claim 13, wherein: The short-circuit current limiting scheme evaluation index set W includes: w1 exceeding the standard site short-circuit current margin index w1, w2 exceeding the standard site regional network loss index w2 and w3 unit capacity cost index w3.

15. The system according to claim 14, wherein: The calculation formula of the short-circuit current margin index w1 of the exceeding-standard site is as follows: Among them, K SC In order to introduce the short-circuit current margin index of the site with exceeded standards, n1 is the number of sites with exceeded standards, and I RCi is the rated interruption capacity of site i, I SCi is the three-phase short-circuit current value of site i.

16. The system according to claim 14, wherein: The calculation formula for the network loss index w2 of the excessive site area is as follows: Among them, K CL To introduce the network loss index of the site area where w2 exceeds the standard, n2 is the number of related partitions, ΔP LLi is the active power loss of partition i.

17. The system according to claim 14, wherein: The calculation formula of the unit capacity cost indicator w3 is as follows: Among them, K UC In order to introduce the unit capacity cost indicator w3, n3 is the number of installed fault current limiters, S Fi The capacity of the fault current limiter installed to limit the short-circuit current at station i, C Ti is the corresponding device investment, I Ti is the change in short-circuit current at exceeding-standard site i.

18. The system according to claim 13, wherein: The contrast matrix C formula is as follows: in, is the element value, n=1,2,3; The comparison matrix C is normalized and the calculation formula is as follows: Based on C ij Determine the index value C K , the calculation formula is as follows:

19. A computer device, characterized in that: include: one or more processors; a processor for executing one or more programs; When the one or more programs are executed by the one or more processors, the method according to any one of claims 1 to 9 is implemented.

20. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed, the method according to any one of claims 1 to 9 is implemented.

Images