CN112328840A - Mining area high-voltage power grid self-adaptive short circuit calculation method based on topology search - Google Patents

Mining area high-voltage power grid self-adaptive short circuit calculation method based on topology search Download PDF

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CN112328840A
CN112328840A CN202011239720.5A CN202011239720A CN112328840A CN 112328840 A CN112328840 A CN 112328840A CN 202011239720 A CN202011239720 A CN 202011239720A CN 112328840 A CN112328840 A CN 112328840A
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靳力
周学华
樊金志
徐志宗
陈军旗
赵喜宾
樊天南
郭传玉
别佳琳
周燕妍
王新良
徐志国
赵伟
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Abstract

The invention discloses a mining area high-voltage power grid self-adaptive short circuit calculation method based on topology search, which belongs to the field of mining area high-voltage power grid self-adaptive short circuit calculation.

Description

Mining area high-voltage power grid self-adaptive short circuit calculation method based on topology search
Technical Field
The invention discloses a mining area high-voltage power grid self-adaptive short circuit calculation method based on topology search, and belongs to the field of mining area high-voltage power grid self-adaptive short circuit calculation.
Background
The original coal mine high-voltage power grid mainly adopts a split operation mode, each section of bus is powered by the same power supply, the power supply structure is more and more complex along with the development of a mining area, and the situation that double power supplies or more power supplies simultaneously supply power for the same bus occurs in the mining area high-voltage power grid; the original self-adaptive short circuit calculation method is no longer suitable for completing the self-adaptive short circuit calculation of the high-voltage power grid of the current mining area, the short circuit current calculation of the high-voltage power grid of the mining area is completed manually, the calculation task is heavy, and the working efficiency is low.
Disclosure of Invention
The invention aims to solve the technical problem of automatic short-circuit current calculation of a high-voltage power grid in a mining area under the condition of simultaneous power supply of multiple power supplies.
In order to achieve the purpose, the technical scheme adopted by the invention is that a mining area high-voltage power grid self-adaptive short circuit calculation method based on topology search comprises the following specific steps:
according to the characteristics of a mining area high-voltage power grid power supply system, the power supply relation among different devices under the condition of single power supply is obtained, in the mining area high-voltage power grid power supply system, all the interconnection switches are in a switching-off state, and other switches are in a switching-on state; the power supply relation analysis comprises the following specific steps:
step 101, numbering each power supply, high-voltage switch (including interconnection switch), bus, transformer and line equipment in a high-voltage power grid of a mining area, wherein the number of each equipment is unique; the device power relationship set DeviceRelationset, set CurretDeviceSet, set needleContinueDealDeviceSet, set DeviceSet, set NewCurretDeviceSet, set TempNeedContinueDealDeviceSet, and set AllDeviceRelationset are all set to null; setting the aggregation Powerset to be empty, and adding all power supplies in a high-voltage power grid of a mining area into the aggregation Powerset; taking out an element from the PowerSet set, and executing step 102;
102, expressing an element taken out from the Powerset by using Power1, and expressing an equipment number corresponding to Power1 by using RefPower 1; adding all high-voltage switches (including tie switches), buses, transformers and lines in the high-voltage power grid of the mining area into a device set, taking one element from the device set, and executing step 103;
step 103, the element extracted from the set Device set is represented by Device1, the Device number of the Device1 is represented by RefDevice1, if the Device1 is a bus, a transformer or a line, step 104 is executed; if the Device1 is a high voltage switch and the switch status is on, execute step 104; if the Device1 is a high voltage switch and the switch status is open, go to step 105;
step 104, if the Device1 is directly connected to Power1, then Device1 is powered by Power1, and elements { RefPower1, RefDevice1, 1} are added in the Device relationship set for powering, indicating that the Device numbered RefDevice1 is powered by the Device numbered RefPower1, and at the same time, adding the Device1 to the set currettdeviceset, and executing step 105; if the Device1 is not directly connected to Power1, add the Device1 to the set needleContinueDealDeviceSet, execute step 105;
step 105, if the set DeviceSet is not empty, taking an element from the set DeviceSet, and executing step 103; if the set DeviceSet is empty, go to step 106;
step 106, searching whether a device with the device type of the bus exists in the set CurretDeviceSet, if so, only reserving the bus device in the set CurretDeviceSet, adding all other devices into the set needlecontinuedelaldevicetset, and simultaneously deleting all elements corresponding to the Power supply relationship between the other devices and the device Power1 in the set DeviceRelationSet, and executing step 107; if no device with the device type as the bus exists in the set CurretDeviceSet, executing step 107;
step 107, if the set CurretDeviceSet is not empty, taking an element from the set CurretDeviceSet, and executing step 108; if the set CurretDeviceSet is empty, go to step 114;
step 108, the element taken out is represented by Device2, the Device number of the Device2 is represented by RefDevice2, one element is taken out from the set needleContinueDealDeviceSet, and step 109 is executed;
step 109, the extracted element is represented by Device3, and the Device number of the Device3 is represented by RefDevice 3; if the Device3 is a bus, transformer or line, go to step 110; if the Device3 is a high voltage switch and the switch status is on, go to step 110; if the Device3 is a high voltage switch and the switch status is open, go to step 111;
step 110, if the Device3 is directly connected to the Device2, then the Device3 is powered by the Device2, and adds the elements { Device2, Device3, 1} in the set Device relationship set, and at the same time, adds the Device3 to the set newcurretdevice set, and execute step 111; if the Device3 is not directly connected to Device2, add the Device3 to the set TempNedContinueDealDeviceSet, execute step 111;
step 111, if the set needleContinueDealDeviceSet is not empty, taking out an element from the set needleContinueDealDeviceSet, and executing step 109; if the set needlecontinueDealDeviceSet is empty, go to step 112;
step 112, adding all elements in the set TempNedContinueDealDeviceSet into the set NedContinueDealDeviceSet, and setting the set TempNedContinueDealDeviceSet to be null; searching whether a Device with the Device type of the bus exists in the set NewCurretDeviceSet, if so, only reserving the bus Device in the set NewCurretDeviceSet, adding all other devices into the set NewCuretDeviceDeviceSet, and deleting all elements corresponding to the power supply relationship between the other devices and the Device2 in the set DeviceRelationset, and executing step 113; if no device with the device type of the bus exists in the set NewCurretDeviceSet, executing step 113;
step 113, adding all elements in the set NewCurretDeviceSet into the set CurretDeviceSet, and setting the set NewCuretDeviceSet to be null; if the set CurretDeviceSet is not empty, taking an element from the set CurretDeviceSet, and executing step 108; if the set curretDeviceSet is empty, add the set DeviceRelationset as an element of the set AllDeviceRelationset to the set AllDeviceRelationset, and set the set DeviceRelationset to empty, perform step 114;
step 114, if the set PowerSet is not empty, taking out an element from the set PowerSet, and executing step 102; if the PowerSet is empty, the power relationship between different devices in the case of any power supply alone is stored in the AllDeviceRelationsET.
According to the power supply relation among different equipment under the single power supply condition that obtains, accomplish the calculation of the self-adaptation short circuit current of different generating lines, although there are a plurality of power in the mining area high voltage electric network, the power that supplies power for same generating line simultaneously generally does not exceed two, therefore at present this patent only considers the condition that the two power supplies at most are same generating line power supply, and concrete step is as follows:
step 201, assume that the set AllDeviceRelationSet includes N elements, each element corresponds to a power supply relationship set between different devices under the condition of single power supply, assume that the device power supply relationship set corresponding to the ith element uses AllDeviceRelationSetiIs shown, its corresponding Power supply is PoweriTo represent；
Step 202, adding all buses in a high-voltage power grid of a mining area into a set BusSet, and taking out one bus from the set BusSet; the initial value of i is set to 1;
in step 203, Bus number extracted from the set BusSet is represented by Bus1, and queue QD is used1、QD2QDT is set to null, the set DuanluDeviceRelationset is set to null, and step 204 is executed;
step 204, extract the ith element AllDeviceRelationset from the set AllDeviceRelationsetiIn the set AllDeviceRelationsetiWhether an element { a, Bus1, 1} for directly supplying power to the Bus with the number of Bus1 exists is searched for (the { a, Bus1, 1} indicates that the equipment with the number of a directly supplies power to the Bus with the number of Bus 1), and if the element exists, the searched equipment power supply relation set AllDeviceRelationsetiAdding into the DuanluDeviceRelationset set; step 205 is executed;
step 205, adding 1 to the numerical value of i; if i > N, the value of j is set to 1, go to step 206; if i is less than or equal to N, re-executing step 204;
step 206, taking out an element from the DuanluDeviceRelationsET set, wherein the taken-out element is represented by DuanluDRSet1, taking out the element for directly supplying power to Bus1 from DuanluDRSet1, and executing step 207;
step 207, the element extracted from the DuanluDRSet1 is represented as { DDR1, DDR2, 1}, that is, the device numbered as DDR1 directly supplies power to the device numbered as DDR 2; the device with device number DDR1 is added directly to the queue QDjPerforming the following steps; if the device with the device number DDR1 is not a power supply, taking out an element directly supplying power to the device with the device number DDR1 from the DuanluDRSet1, and repeatedly executing step 207; if device DDR1 is the power supply, device with device number DDR1 is added directly to queue QDjIn (3), queue QDjDeleting all the high-voltage switches and buses, adding 1 to the value of j, and executing step 208;
step 208, if the set DuanluDeviceRelationset is not empty, execute step 206; if the DuanluDeviceRelationset is empty, go to step 209;
step 209, finally obtaining m queues QDmThe value of m is j-1, wherein m power supplies are used for supplying power to the Bus1 simultaneously, and corresponding impedance per unit values of the m power supplies (generators), transformers and lines existing in the m queues are calculated respectively;
step 210, if m equals 1, queue QDmAll the devices contained in it supply the Bus1 in series as branch 1, for which queue QDmThe impedance per unit values obtained by pre-calculating the medium line, the transformer and the power supply (generator) complete the automatic calculation of the short-circuit current of the Bus1, and step 212 is executed; if m is equal to 2, go to step 211;
step 211, queue m QDsmRespectively from the original queue QDmTaking out the data, adding the data into a queue QDT (QDT) which only stores the equipment with the same equipment number as one element, wherein the equipment in the queue QDT forms a branch 3; since m is equal to 2, the queue QD1The remaining devices in (1) form the branch (1), the Queue (QD)2The remaining devices of (2) constitute branch 2; then, the branch connection condition for supplying power to the Bus1 can be known as follows: firstly, a branch 1 is connected with a branch 2 in parallel, and then power is supplied to a Bus1 in a mode of being connected with a branch 3 in series; according to the distribution coefficient method, the impedance per unit value pre-calculated in the parallel equipment and the impedance per unit value pre-calculated in the series equipment, the automatic calculation of the short-circuit current of the bus can be completed;
step 212, if the set BusSet is not empty, taking out a bus from the set BusSet, and executing step 203; and if the set BusSet is empty, calculating the short-circuit current of all buses of the high-voltage power grid in the mining area.
Preferably, in step 211, the short-circuit current calculation step of the Bus1 is as follows:
step 2111, assuming the pre-calculated per unit value of total impedance of the branch 1 as X1The per unit value of the total impedance of the branch 2 is X2The per unit value of the total impedance of the branch 3 is X3，X1、X2、X3Respectively corresponding to the power supply (generator) and the transformer on the branchThe sum of per unit values of the impedances of the voltage transformer and the line; per unit value of total impedance XzComprises the following steps:
Figure 552960DEST_PATH_IMAGE002
step 2112, calculating the short-circuit current I of the branch 1d-1：
Figure 1258DEST_PATH_IMAGE004
Figure 312154DEST_PATH_IMAGE006
Figure 238522DEST_PATH_IMAGE008
Kfz-1The current branching coefficient is branch 1; xzy-1Transfer reactance for branch 1; i isd-1Short circuit current for branch 1; i isjIs a reference current;
step 2113, calculating the short-circuit current I of the branch 2d-2：
Figure 318473DEST_PATH_IMAGE010
Figure 672094DEST_PATH_IMAGE012
Figure 470286DEST_PATH_IMAGE014
Kfz-2The current branching coefficient is branch 2; xzy-2Transfer reactance for leg 2; i isd-2Short circuit current for branch 2; i isjIs a reference current;
step 2114, the short-circuit current of the Bus1 is Id：
Figure 200345DEST_PATH_IMAGE016
The invention has the following beneficial effects: according to the characteristics of the power supply system of the high-voltage power grid in the mining area, the power supply relation topology analysis model among different devices is constructed, and self-adaptive short circuit calculation is completed aiming at all buses of the high-voltage power grid in the mining area on the basis of the constructed topology analysis model, so that the short circuit calculation efficiency is effectively improved.
Drawings
Fig. 1 is a diagram of a mine high-voltage power grid power supply system.
Detailed Description
Example 1
Obtaining the power supply relation among different devices under the condition of single power supply according to a mining area high-voltage power grid power supply system diagram shown in the attached figure 1, and the method comprises the following specific steps:
step 101, as can be known from the mining area high voltage power grid shown in fig. 1, initially, elements included in the PowerSet set are { P1, P2, P3}, and elements included in the DeviceSet are { S1, S2, S3, S4, S21, S22, S23, S24, S5, S6, S7, S8, S9, S16, S10, S20, S11, S12, S13, S17, S14, S15, T16, T17, T18, L19, L21, B1, B2, B3, B4, B5, B6, B7 };
102, taking out an element from the Powerset to be assumed as P1, wherein the equipment number corresponding to P1 is represented by RefPower 1;
step 103, traversing all elements in the set DeviceSet, wherein only device S3 is directly connected to P1 among the elements taken out from the set DeviceSet, and the switching state of the device S3 is closed, then the device power supply relationship set devicerelatedset = { P1, S3, 1}, set CurretDeviceSet = { S3}, set needlecontinuedealdeviceset = { S1, S2, S4, S21, S22, S23, S24, S5, S6, S7, S8, S9, S16, S10, S20, S11, T11, L11, B11, 11B };
step 104, searching whether a device with the device type of bus exists in the set CurretDeviceSet, if so, only reserving the bus device in the set CurretDeviceSet, adding all other devices into the set needlecontinuedelaldevicetset, and simultaneously deleting all elements corresponding to the power supply relationship between other devices and the device P1 in the set DeviceRelationSet, and executing step 105; if no device with the device type as the bus exists in the set CurretDeviceSet, executing step 105;
step 105, taking an element from the set CurretDeviceSet, wherein the taken device is S3, and the device number of the device S3 is represented by RefDevice 2; traversing elements in the set needlecontueDealDealDeviceSet, wherein only the device B and the device S are directly connected from the elements taken out from the set needleContinueDealDeviceSet, and the switch state of the device S is closed, then the device power supply relationship set DeviceRelationset = { { P, S, 1}, { S, B, 1} }, the set NewCurretDeviceSet = { B }, and the set TempNeedContinueDealDeviceSet = { S, T, L, B };
step 106, after the traversal of the elements in the set needlecontinueDealDeviceSet is completed, adding all elements in the set TempNeedContinueDealDeviceSet into the set needlecontinueDealDeviceSet, and setting the set TempNeedContinueDealDeviceSet to be null;
step 107, adding all elements in the set NewCurretDeviceSet into the set CurretDeviceSet, and setting the set NewCuretDeviceSet to be null; if the set CurretDeviceSet is not empty, topology learning of the power supply relationship is completed according to the power supply relationship analysis step in the invention content aiming at other elements in the set CurretDeviceSet; finally, when the element extracted from the PowerSet is P1, the finally obtained device power supply relationship set includes DeviceRelationSet = { { P1, S3, 1}, { S3, B3, 1}, { B3, S4, 1}, { S4, T16, 1}, { T16, S5, 1}, { S5, B4, 1}, { B4, S23, 1}, { B4, S6, 1}, { B4, S7, 1}, { S23, T17, 1}, { S7, L68672, 1}, { T7, S7, 1}, { L7, S7, 1}, { S7, B7, S7, and S7; adding the obtained power supply relationship set DeviceRelationset into the set AllDeviceRelationset, and then setting the power supply relationship set DeviceRelationset to null;
step 108, as can be seen from the above steps, when the element extracted from the PowerSet is P2, the finally obtained device power supply relationship set is a DeviceRelationSet = { { P2, S1, 1}, { S1, B1, 1}, { B1, S21, 1}, { S21, T17, 1}, { T17, S23, 1}, { S23, B4, 1}, { B4, S5, 1}, { B4, S6, 1}, { B4, S7, 1}, { S5, T16, 1}, { S7, L7, 1}, { T7, S7, 1}, { L7, S7, 1}, { S7, B7, S7, B, S7, and S7; adding the obtained power supply relationship set DeviceRelationset into the set AllDeviceRelationset, and then setting the power supply relationship set DeviceRelationset to null;
step 109, in a case where the element extracted from the set PowerSet is P3, the device power supply relationship set obtained finally includes a DeviceRelationSet = { { P3, S2, 1}, { S2, B2, 1}, { B2, S22, 1}, { S22, T18, 1}, { T18, S24, 1}, { S24, B5, 1}, { B5, S8, 1}, { B5, S9, 1}, { S8, L21, 1}, { L21, S20, 1}, { S20, B7, 1}, { B7, S14, 1}, { B7, S15, 1} }; the obtained power supply relationship set DeviceRelationsET is added to the set AllDeviceRelationsET, and then the power supply relationship set DeviceRelationsET is set to null.
According to the obtained power supply relation among different devices under the condition of single power supply, completing the self-adaptive short-circuit current calculation of different buses; respectively taking a bus B4 and a bus B6 as examples to explain the self-adaptive short-circuit current calculation process;
the self-adaptive short-circuit current calculation process is described by taking a bus B4 as an example, and the specific steps are as follows:
step 201, in the device power supply relationship set corresponding to the power supplies P1, P2 and P3, only the element for supplying power to the bus B4 exists in the device power supply relationship set corresponding to the power supplies P1 and P2;
in step 202, elements directly or indirectly supplying power to the bus B4 in the device power supply relationship set corresponding to the power source P1 are { { P1, S3, 1}, { S3, B3, 1}, { B3, S4, 1}, { S4, T16, 1}, { T16, S5, 1}, { S5, B4, 1}, respectively, and devices supplying power to the bus B4 join in the queue Q1In, queue Q1In the end, only the line, the transformer and the power supply, Q, are reserved1={T16，P1}；
In step 203, elements directly or indirectly supplying power to the bus B4 in the device power supply relationship set corresponding to the power source P2 are { { P2, S1, 1}, { S1, B1, 1}, { B1, S21, 1}, { S21, T17, 1}, { T17, S23, 1}, { S23, B4, 1}, respectively, and devices supplying power to the bus B4 join in the queue Q2In, queue Q2In the end, only the line, the transformer and the power supply, Q, are reserved2={T17，P2}；
Step 204, queue Q1And queue Q2The devices corresponding to different elements supply power to the bus B4 in a parallel mode; the short-circuit current of the bus B4 can be automatically calculated according to the impedance per unit value pre-calculated by the parallel equipment;
the self-adaptive short-circuit current calculation process is described by taking a bus B6 as an example, and the specific steps are as follows:
step 301, in the device power supply relationship set corresponding to the power sources P1, P2, and P3, only the element for supplying power to the bus B6 exists in the device power supply relationship set corresponding to the power sources P1 and P2;
in step 302, elements directly or indirectly supplying power to the bus B6 in the device power supply relationship set corresponding to the power source P1 are { { P1, S3, 1}, { S3, B3, 1}, { B3, S4, 1}, { S4, T16, 1}, { T16, S5, 1}, { S5, B4, 1}, { B4, S7, 1}, { S7, L19, 1}, { L19, S10, 1}, { S10, B6, 1}, respectively, and devices supplying power to the bus B6 join in the queue Q61In, queue Q1In the end, only the line, the transformer and the power supply, Q, are reserved1={P1，T16，L19}；
Step 303, directly or indirectly supplying power to the bus B6 in the device power supply relationship set corresponding to the power source P2The elements are { { P2, S1, 1}, { S1, B1, 1}, { B1, S21, 1}, { S21, T17, 1}, { T17, S23, 1}, { S23, B4, 1}, { B4, S7, 1}, { S7, L19, 1}, { L19, S10, 1}, { S10, B6, 1} } respectively, and equipment for supplying power to the bus B6 is added to the queue Q32In, queue Q2In the end, only the line, the transformer and the power supply, Q, are reserved2={P2，T17，L19}；
Step 304, queue Q1And queue Q2The same element in the queue is L19, queue Q1And queue Q2Different elements in the bus are { P1, T16} and { P2, T17}, respectively, then the branch 1 is formed by connecting the P1 and the T16 in series, the branch 2 is formed by connecting the P2 and the T17 in series, then the branch 1 and the branch 2 are connected with the L19 in series in parallel to supply power to the bus B6, and the short-circuit current of the bus B6 can be automatically calculated according to the pre-calculated device impedance unit value and the series-parallel relation thereof.
For the mining area high-voltage power grid shown in fig. 1, although three power supplies exist, in the power supply system of the mining area high-voltage power grid, all the tie switches are in an open state and other switches are in a close state in a normal operation mode; therefore, in the high-voltage power grid of the mining area shown in the attached figure 1, only two power supplies at most supply power to each section of bus; the invention takes a bus B4 and a bus B6 as examples to illustrate the automatic short-circuit current calculation process of the high-voltage power grid in the mining area, and the calculation processes of the short-circuit of other buses in the high-voltage power grid in the mining area are the same as the calculation processes; therefore, the self-adaptive short circuit calculation method for the high-voltage power grid in the mining area can finish automatic short circuit current calculation, and effectively improves the short circuit calculation efficiency.
The mining area high-voltage power grid self-adaptive short circuit calculation method based on topology search is described in detail above; the principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (3)

1. A mining area high-voltage power grid self-adaptive short circuit calculation method based on topology search is characterized by comprising the following specific steps:
step 1, obtaining power supply relations among different devices under the condition of single power supply according to the characteristics of a mining area high-voltage power grid power supply system, wherein in the mining area high-voltage power grid power supply system, all contact switches are in a switching-off state, and other switches are in a switching-on state; the power supply relation analysis comprises the following specific steps:
step 101, numbering each power supply, high-voltage switch, bus, transformer and line equipment in a high-voltage power grid of a mining area, wherein the number of each equipment is unique; the device power relationship set DeviceRelationset, set CurretDeviceSet, set needleContinueDealDeviceSet, set DeviceSet, set NewCurretDeviceSet, set TempNeedContinueDealDeviceSet, and set AllDeviceRelationset are all set to null; setting the aggregation Powerset to be empty, and adding all power supplies in a high-voltage power grid of a mining area into the aggregation Powerset; taking out an element from the PowerSet set, and executing step 102;
102, expressing an element taken out from the Powerset by using Power1, and expressing an equipment number corresponding to Power1 by using RefPower 1; adding all high-voltage switches, buses, transformers and lines in a high-voltage power grid of a mining area into a device set, taking one element from the device set, and executing step 103;
step 103, if the element extracted from the set Device set is represented by Device1, the Device number of the Device1 is represented by RefDevice1, and the Device1 is a bus, a transformer or a line, then step 104 is executed; if the Device1 is a high-voltage switch and the switch is closed, execute step 104; if the Device1 is a high voltage switch and the switch status is open, go to step 105;
step 104, if the Device1 is directly connected to Power1, then Device1 is powered by Power1, and elements { RefPower1, RefDevice1, 1} are added in the Device relationship set for powering, indicating that the Device numbered RefDevice1 is powered by the Device numbered RefPower1, and at the same time, adding the Device1 to the set currettdeviceset, and executing step 105; if the Device1 is not directly connected to Power1, then add the Device1 to the set needleContinueDealDealDeviceSet, perform step 105;
step 105, if the set DeviceSet is not empty, taking out an element from the set DeviceSet, and executing step 103; if the DeviceSet set is empty, go to step 106;
step 106, searching whether equipment with the equipment type of a bus exists in the set CurretDeviceSet, if equipment with the equipment type of the bus exists, only reserving the bus equipment in the set CurretDeviceSet, adding all other equipment into the set needleContinueDealDeviceSet, and deleting all elements corresponding to the Power supply relation between other equipment and the equipment Power1 in the set DeviceRelationset, and executing step 107; if no device with the device type of bus exists in the set CurretDeviceSet, execute step 107;
step 107, if the set CurretDeviceSet is not empty, taking an element from the set CurretDeviceSet, and executing step 108; if the set CurretDeviceSet is empty, go to step 114;
step 108, the element taken out is represented by Device2, the Device number of the Device2 is represented by RefDevice2, one element is taken out from the set needleContinueDealDeviceSet, and step 109 is executed;
step 109, the extracted element is represented by Device3, and the Device number of the Device3 is represented by RefDevice 3; if the Device3 is a bus, a transformer or a line, execute step 110; if the Device3 is a high-voltage switch and the switch is closed, execute step 110; if the Device3 is a high voltage switch and the switch status is open, go to step 111;
step 110, the Device3 is directly connected to the Device2, then the Device3 is powered by the Device2, the element { Device2, Device3, 1} is added to the set Device relationship set, and at the same time, the Device3 is added to the set new curret Device set, and step 111 is executed; if the Device3 is not directly connected to the Device2, then the Device3 is added to the set TempNedContinueDealDeviceSet, and step 111 is executed;
step 111, if the set needleContinueDealDeviceSet is not empty, taking out an element from the set needleContinueDealDeviceSet, and executing step 109; if the set needlecontinueDealDeviceSet is empty, go to step 112;
step 112, adding all elements in the set TempNedContinueDealDeviceSet into the set NedContinueDealDeviceSet, and setting the set TempNedContinueDealDeviceSet to be null; searching whether equipment with the equipment type of a bus exists in the set NewCurretDeviceSet, if equipment with the equipment type of the bus exists, only reserving the bus equipment in the set NewCurretDeviceSet, simultaneously deleting all elements corresponding to the power supply relation between other equipment and equipment 2 in the set DeviceRelationset, adding all other equipment into the set NewContinueDealDeviceSet, and executing step 113; if no device with the device type of bus exists in the set NewCurretDeviceSet, executing step 113;
step 113, adding all elements in the set NewCurretDeviceSet into the set CurretDeviceSet, and setting the set NewCuretDeviceSet to be null; if the set CurretDeviceSet is not empty, taking an element from the set CurretDeviceSet, and executing step 108; if the set CurretDeviceSet is empty, add the set DeviceRelationSet as an element of the set AllDeviceRelationSet to the set AllDeviceRelationSet, and set the set DeviceRelationSet to be empty, execute step 114;
step 114, if the set PowerSet is not empty, taking out an element from the set PowerSet, and executing step 2; if the set PowerSet is empty, the power supply relationship among different devices under the condition that any power supply supplies power independently is stored in the set AllDeviceRelationsET;
step 2, completing the self-adaptive short-circuit current calculation of different buses according to the obtained power supply relation among different devices under the condition of single power supply, and specifically comprising the following steps:
step 201, assume that the set AllDeviceRelationset includes N elements, each element corresponding to different devices under a single power supplyA power supply relationship set, wherein the power supply relationship set of the device corresponding to the ith element is assumed to use AllDeviceRelationsetiI is more than or equal to 1 and less than or equal to n, and the corresponding Power supply uses PoweriRepresents;
step 202, adding all buses in a high-voltage power grid of a mining area into a set BusSet, and taking out one bus from the set BusSet; the initial value of i is set to 1;
in step 203, Bus number extracted from the set BusSet is represented by Bus1, and queue QD is used1、QD2QDT is set to null, the set DuanluDeviceRelationset is set to null, and step 204 is executed;
step 204, extract the ith element AllDeviceRelationset from the set AllDeviceRelationsetiIn the set AllDeviceRelationsetiIf the element { a, Bus1, 1} for directly supplying power to the Bus with the number of Bus1 exists, the searched equipment power supply relation set AllDeviceRelationset is searched for, and if the element { a, Bus1, 1} indicates that the equipment with the number of a directly supplies power to the Bus with the number of Bus1 exists, and if the element { a, Bus1, 1} indicates that the equipment with the number of a directly supplies power to the Bus with the number of Bus1 exists, the searched equipment power supply relation set AlliAdding into the DuanluDeviceRelationset set; step 205 is executed;
step 205, adding 1 to the numerical value of i; when i > N, the value of j is set to 1, and step 206 is executed; when i is less than or equal to N, re-executing step 204;
step 206, taking out an element from the DuanluDeviceRelationsET set, wherein the taken-out element is represented by DuanluDRSet1, taking out the element for directly supplying power to Bus1 from DuanluDRSet1, and executing step 207;
step 207, the element extracted from the DuanluDRSet1 is represented as { DDR1, DDR2, 1}, that is, the device numbered as DDR1 directly supplies power to the device numbered as DDR 2; the device with device number DDR1 is added directly to the queue QDjPerforming the following steps; when the device with the device number DDR1 is not a power supply, taking out an element for directly supplying power to the device with the device number DDR1 from the DuanluDRSet1, and repeatedly executing step 207; when the device DDR1 is the power supply, the device with the device number DDR1 is directly added to the queue QDjIn (3), queue QDjDeleting all the high-voltage switches and buses, adding 1 to the value of j, and executing step 208;
step 208, if the set DuanluDeviceRelationset is not empty, then step 206 is executed; if the DuanluDeviceRelationset is empty, go to step 209;
step 209, finally obtaining m queues QDmThe value of m is j-1, wherein m is less than or equal to 2, m power supplies are available for supplying power to the Bus1 at the same time, and the corresponding impedance per unit values are calculated respectively for the lines, the transformers and the power supplies which exist in the m queues;
at step 210, when m equals 1, then the queue QDmAll the devices contained in it supply the Bus1 in series as branch 1, for which queue QDmThe impedance per unit values obtained by pre-calculating the medium line, the transformer and the power supply complete the automatic calculation of the short-circuit current of the Bus1, and step 212 is executed; if m is equal to 2, go to step 211;
step 211, queue m QDsmRespectively from the original queue QDmTaking out the data, adding the data into a queue QDT (QDT) which only stores the equipment with the same equipment number as one element, wherein the equipment in the queue QDT forms a branch 3; since m is equal to 2, the queue QD1The remaining devices in (1) form the branch (1), the Queue (QD)2The remaining devices of (2) constitute branch 2; then, the branch connection condition for supplying power to the Bus1 can be known as follows: firstly, a branch 1 is connected with a branch 2 in parallel, and then power is supplied to a Bus1 in a mode of being connected with a branch 3 in series; according to the distribution coefficient method, the impedance per unit value pre-calculated in the parallel equipment and the impedance per unit value pre-calculated in the series equipment, the automatic calculation of the short-circuit current of the bus can be completed;
step 212, if the set BusSet is not empty, taking out a bus from the set BusSet, and executing step 203; and if the set BusSet is empty, calculating the short-circuit current of all buses of the high-voltage power grid in the mining area.
2. The mining area high-voltage power grid adaptive short-circuit calculation method based on topology search is characterized in that in step 211, the short-circuit current calculation step of the Bus1 is as follows:
step 2111, falseThe per unit value of the total impedance of the branch 1 obtained by pre-calculation is determined as X1The per unit value of the total impedance of the branch 2 is X2The per unit value of the total impedance of the branch 3 is X3，X1、X2、X3The sum of per unit values of impedances respectively corresponding to a power supply (a generator), a transformer and a circuit on the branch circuit; per unit value of total impedance XzComprises the following steps:
Figure DEST_PATH_IMAGE002AA
step 2112, calculating the short-circuit current I of the branch 1d-1：
Figure DEST_PATH_IMAGE004AA
Figure DEST_PATH_IMAGE006AA
Figure DEST_PATH_IMAGE008AA
Kfz-1The current branching coefficient is branch 1; xzy-1Transfer reactance for branch 1; i isd-1Short circuit current for branch 1; i isjIs a reference current;
step 2113, calculating the short-circuit current I of the branch 2d-2：
Figure DEST_PATH_IMAGE010AA
Figure DEST_PATH_IMAGE012AA
Figure DEST_PATH_IMAGE014AA
Kfz-2The current branching coefficient is branch 2; xzy-2Transfer reactance for leg 2; i isd-2Short circuit current for branch 2; i isjIs a reference current;
step 2114, the short-circuit current of the Bus1 is Id：
Figure DEST_PATH_IMAGE016AA
。
3. The mining area high-voltage power grid adaptive short circuit calculation method based on topology search according to any one of claims 1 or 2, characterized in that no more than two power supplies are used for supplying power to the same bus simultaneously.
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