Transfer and supply cooperation method for multi-interconnection switch circuit

Abstract

The invention discloses a transfer and supply cooperation method for a multi-interconnection switch line, and relates to the technical field of local feeder automation, and the method comprises the steps: obtaining the topological position information of line switches and interconnection switches based on a line topological graph; the switching time of the line switch is preset based on the topological position information, wherein the switching time comprises delay switching-on time, fault detection time, long delay and short-time locking switching-off time; obtaining the longest branch line in the multiple interconnection switch lines on the two sides connected with the interconnection switches to obtain a first line and a second line respectively; respectively obtaining the maximum fault processing time of the first line and the second line based on the switching time; obtaining the initial transfer time of the interconnection switch based on the maximum fault processing time; and on the basis of the switching time and the initial wheeling time, the interconnection wheeling of the line is executed, and the problem that an existing wheeling matching method of the multi-interconnection switch line lacks a safety action logic and constant value matching strategy is solved.

Description

Technical Field

[0001] This invention relates to the field of local feeder automation technology, and more specifically, to a method for switching and coordinating multiple interconnecting switch lines. Background Technology

[0002] Local feeder automation, as an important power distribution automation technology, offers significant advantages such as low investment cost and rapid implementation, as it can autonomously locate and isolate faulty sections without relying on a master station and communication system. It has become one of the feeder automation models primarily promoted by the State Grid Corporation of China. In this technical system, the tie switch plays a crucial role. A tie switch with automatic closing function can automatically close after a fault is isolated, transferring power to adjacent healthy lines in the non-faulty section, thereby effectively shortening power outage time and improving power supply reliability. In recent years, this technology has been actively promoted and applied throughout China.

[0003] However, current practices and applications are mostly limited to single-tie wiring mode, meaning a faulty line can only obtain backup power from another healthy line through a single tie switch. In this relatively simple structure, the logical coordination between setting parameters and switches is clear, reliably enabling fault handling and load transfer. With users' increasing demands for power supply reliability and the growing complexity of distribution network structures, single-tie wiring mode can no longer meet practical needs, making the development of multi-tie wiring mode an inevitable trend.

[0004] However, in multi-tie switch lines, the operational logic and setting relationships between the various tie switches become extremely complex due to the existence of multiple possible power restoration paths. Improper settings can easily lead to logical conflicts when multiple tie switches operate simultaneously or sequentially, causing operational risks such as power flow reversal and fault closing. Currently, the industry lacks a clear, unified, and effective solution on how to set settings to ensure reliable and orderly coordination among the switches in multi-tie lines. Summary of the Invention

[0005] To address the problem that existing power transfer coordination methods for multi-tie switch lines lack safe operating logic and setting coordination strategies, resulting in the inability to safely and orderly achieve automatic power transfer to non-faulty sections, this invention provides a power transfer coordination method for multi-tie switch lines, the method comprising:

[0006] Obtain a line topology map of the target area, and based on the line topology map, obtain the topological location information of line switches and tie switches, wherein the line switches include sectionalizing switches and branch switches;

[0007] Based on the topological location information, the pre-set voltage delay closing time of the line switch is set. and fault detection time ;

[0008] Based on the aforementioned delayed closing time Obtain the long delay of the circuit switch and short-time blocking tripping time ;

[0009] Obtain the longest branch line among the multiple interconnecting switch lines on both sides connected to the interconnecting switch, and obtain the first line and the second line respectively;

[0010] Based on the aforementioned delayed closing time The fault detection time The long delay and the short-time blocking tripping time The first maximum fault handling time of the first line and the second maximum fault handling time of the second line are obtained respectively.

[0011] Based on the first maximum fault handling time and the second maximum fault handling time, the initial switching time of the interconnection switch is obtained;

[0012] Based on the aforementioned delayed closing time The fault detection time The long delay The short-time blocking tripping time Based on the initial transfer time, the connection transfer of the line is executed.

[0013] The basic principle of this method for setting the transfer time of local tie-type power supply is the basic requirement of local tie-type power supply, that is, when the tie switch loses voltage on one side and there is no residual voltage blocking, it will automatically close after a certain time to restore power supply to the non-faulty section. The key point is to ensure that the sections and the tie can coordinate and cooperate with each tie switch, which is specifically reflected in how to set the closing time with pressure delay, long delay and the transfer time of the tie switch.

[0014] First, the time required for the power transfer itself must be considered, as well as the coordination between the connecting switches (for example, if a fault occurs on the line where substation 1 is located, both LL1 and LL5 can transfer power, but they cannot both be closed). Finally, the power transfer time must be kept as short as possible. To ensure that the power transfer time is within the preset time (e.g., 100 seconds), a short-time blocking and tripping function needs to be set to make the entire operation process end as quickly as possible, and the length and delay should be minimized. The power transfer time is related to the number of sectionalizing switches, so the power transfer time will increase accordingly when the number of switches increases.

[0015] Therefore, considering the above factors and the fact that the switching time depends on the length of the sectionalizing switch, this method first sets the setting value of the sectionalizing switch, and then determines the longest time for handling faults on both sides of the sectionalizing switch based on the sectionalizing switch (this time is related to the number of switches on the line and the automatic closing time), thereby obtaining the initial switching time of the sectionalizing switch. The line switching is then executed according to the above setting value, which can realize the coordination of line switching with multiple sectionalizing switches, improve the safety and orderliness of line switching, and achieve the effect of each sectionalizing switch cooperating with each other to complete the isolation of complex line faults and the self-restoration of power supply to non-faulty lines.

[0016] Furthermore, the pre-set closed-circuit time of the line switch is a pressure-delayed closing time. The specific steps include:

[0017] For the first sectionalizing switch of a multi-connection switch line, obtain the upstream circuit breaker of the sectionalizing switch. If there is no preset level difference in instantaneous overcurrent protection between the sectionalizing switch and the upstream circuit breaker, and the upstream circuit breaker is preset to have one automatic reclosing, then set the voltage-delayed closing time of the first sectionalizing switch. Set as the first preset duration;

[0018] For non-first section switches and branch switches in multi-connection switch lines, the pressure-delayed closing time is mentioned. All are set to the second preset duration;

[0019] Wherein, the first preset duration is longer than the second preset duration.

[0020] Furthermore, the pressure-delayed closing time Greater than the fault detection time .

[0021] Furthermore, the long delay of the circuit switch is obtained. The specific steps include:

[0022] For multi-connection switch lines before power transfer, determine whether the following conditions are met simultaneously:

[0023] Condition 1: Protection level difference is missing;

[0024] Condition 2: The line switch has feeder automation function;

[0025] Condition 3: The line switch has an undervoltage tripping function;

[0026] Condition 4: The circuit breaker has a peer switch;

[0027] If all conditions are met, then obtain the same-level switch of the line switch, obtain the first downstream branch line of the same-level switch, obtain the first number of switches of the first downstream branch line, and based on the first number of switches and the voltage-delayed closing time... Obtain the long delay of the line switch ;

[0028] If not all conditions are met, then the long delay Set to 0.

[0029] Furthermore, the long delay of the line switch is obtained. The first calculation formula is:

[0030] ;

[0031] in, Indicates a long delay. Indicates the number of the first switch. This indicates the closing time when there is a pressure delay.

[0032] Furthermore, the short-time blocking and tripping time of the line switch is obtained. The specific steps include:

[0033] For a line without protection level difference, obtain all second downstream branch lines of the line switch, obtain the number of second switches in the second downstream branch lines, obtain the maximum number of switch levels based on the number of second switches, obtain the target branch based on the maximum number of switch levels, obtain all target switches of the target branch, and determine the voltage-delayed closing time of the target switches. Obtain the short-time blocking tripping time of the line switch. ;

[0034] Obtain the short-time blocking tripping time of the line switch. The second calculation formula is:

[0035] ;

[0036] in, Indicates the short-term blocking tripping time. Indicates the maximum number of switching stages. Indicates the first The voltage-delayed closing time of each target switch Represents an integer greater than or equal to 1.

[0037] Furthermore, the first maximum fault handling time of the first line and the second maximum fault handling time of the second line are obtained based on the first method.

[0038] The first method is:

[0039] Obtain the number of the first switch and the number of the third switches of the first switch in the input line, and base the calculation on the number of the third switches and the long delay of the first switch. With the aforementioned pressure-delayed closing time To obtain the maximum fault handling time;

[0040] The third calculation formula for obtaining the maximum fault handling time is:

[0041] ;

[0042] in, Indicates the maximum fault handling time. Indicates the number of third switches. Indicates the first The voltage-delayed closing time of the first switch Indicates the first The long delay of the first switch, Represents an integer greater than or equal to 1.

[0043] Based on the above-mentioned settings, this method further considers the coordination of tie switches. When a single line fault occurs, the two tie switches related to it will activate the automatic transfer function, but only one tie switch can be closed. Therefore, there must be a priority between the tie switches, that is, there must be a time difference between the transfer times. This time difference must be at least greater than the longest automatic closing time of the switches between the tie switches, that is, the sum of the long and short delays of all switches. This method is more suitable for the transfer coordination of multiple tie switches, further improving the safety and orderliness of line transfer.

[0044] Furthermore, the method also includes:

[0045] Based on the long delay and the aforementioned pressure-delayed closing time Obtain the automatic closing time of the line switch;

[0046] Based on the line topology diagram and the preset rotation direction, a directed graph of the tie switch is obtained, and based on the directed graph and the automatic closing time, the transfer time difference between two adjacent tie switches is obtained.

[0047] The initial transfer time is updated based on the update method to obtain the final transfer time of the contact switch;

[0048] The update method is as follows:

[0049] S1. Obtain an intermediate contact switch based on the minimum value of the initial transfer time;

[0050] S2. Based on the directed graph, obtain the communication switches on both sides adjacent to the middle communication switch to obtain the left communication switch and the right communication switch;

[0051] S3. Based on the initial transfer time, obtain the first time difference between the left and right contact switches and the middle contact switch, respectively, and obtain the new transfer time of the middle contact switch, the left contact switch and the right contact switch based on the first time difference and the transfer time difference.

[0052] S4. Obtain the downstream communication switch adjacent to the right communication switch, update the intermediate communication switch to the downstream communication switch, update the initial transfer time to the new transfer time, delete the new transfer time, return to S2, and continue until the termination condition is met, the iteration ends, and the final transfer time is obtained based on the initial transfer time.

[0053] The fourth calculation formula for obtaining the automatic closing time of the line switch is:

[0054] ;

[0055] in, Indicates a long delay. Indicates the number of the first switch. Indicates the time for closed-circuit operation with pressure delay. Indicates the automatic closing time.

[0056] Furthermore, the termination condition is:

[0057] If the number of the communication switches is even, then the iteration ends when the downstream communication switch in S4 is the intermediate communication switch in S1.

[0058] If the number of the contact switches is odd, the iteration ends when the downstream contact switch in S4 is the left contact switch that first appeared in S2.

[0059] Furthermore, when the downstream contact switch in S4 is the left contact switch that first appeared in S2, the method further includes:

[0060] The left-side contact switch that first appears in S2 is identified as the first contact switch;

[0061] Obtain the connection switches on both sides adjacent to the first connection switch, and obtain the upstream connection switch and the initial connection switch;

[0062] Based on the final transfer time, a second time difference between the first contact switch and the initial contact switch is obtained; based on the second time difference and the transfer time difference, the first latest transfer time of the first contact switch is obtained.

[0063] Based on the final transfer time and the first latest transfer time, a third time difference between the first connecting switch and the upstream connecting switch is obtained. Based on the third time difference and the transfer time difference, a second latest transfer time of the upstream connecting switch is obtained.

[0064] One or more technical solutions provided by this invention have at least the following technical effects or advantages:

[0065] 1. This method first sets the set value of the sectionalizing switch, and then determines the longest time for handling faults on both sides of the connecting switch based on the sectionalizing switch (this time is related to the number of switches on the line and the automatic closing time), thereby obtaining the initial transfer time of the connecting switch. The line transfer is executed according to the above set value, which can realize the coordination of line transfer with multiple connecting switches, improve the safety and orderliness of line transfer, and realize the effect of each connecting switch cooperating with each other to complete the fault isolation of complex lines and the self-restoration of power supply to non-faulty lines.

[0066] 2. This method further considers the coordination of tie switches. When a single line fault occurs, the two tie switches related to it will activate the automatic transfer function, but only one tie switch can be closed. Therefore, there must be a priority between the tie switches, that is, there must be a time difference between the transfer times. This time difference must be at least greater than the longest automatic closing time of the switches between the tie switches, that is, the sum of the long and short delays of all switches. This method is more suitable for the transfer coordination of multiple tie switches, and further improves the safety and orderliness of line transfer. Attached Figure Description

[0067] The accompanying drawings, which are provided to further illustrate embodiments of the invention and constitute a part of this invention, are not intended to limit the scope of the invention.

[0068] Figure 1 This is a flowchart illustrating a power transfer coordination method for a multi-connection switch circuit;

[0069] Figure 2 This is a schematic diagram of the circuit topology of a five-connector switch circuit;

[0070] Figure 3 This is a schematic diagram of the setting value for the sectionalizing switch;

[0071] Figure 4 It is the voltage-delayed closing time of the sectionalizing switch. and long delay A schematic diagram of the fixed value setting;

[0072] Figure 5 This is a schematic diagram showing the initial power transfer time setting of the tie switch;

[0073] Figure 6 This is a schematic diagram showing the setting of the final transfer time of the tie switch;

[0074] Among them, CB1 to CB5 represent different 10kV feeder outgoing circuit breakers with time-delay protection and secondary reclosing function, FD11 to FD52 represent different sectionalizing switches, FZ11 to FZ51 represent different branch switches, and LL1 to LL5 represent different tie switches. All of the above switches are circuit breakers. C is the pressurized delayed closing time, and C is the short-time blocking opening time. For long delay, These represent the time differences between the transfer of power between two adjacent interconnecting switches. These correspond to the automatic transfer times of LL1 to LL5 in sequence. and Both represent the automatic transfer time of LL2. Both represent the automatic transfer time of LL4. . Detailed Implementation

[0075] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other.

[0076] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0077] Example 1

[0078] refer to Figures 1-6 This embodiment provides a method for power transfer coordination of multiple interconnection switch lines, the method comprising:

[0079] refer to Figure 2 Obtain a line topology map of the target area, and obtain the topological location information of line switches and tie switches based on the line topology map. The line switches include sectional switches and branch switches.

[0080] Based on the topological location information, the pre-set voltage delay closing time of the line switch is set. and fault detection time ;

[0081] Based on the aforementioned delayed closing time Obtain the long delay of the circuit switch and short-time blocking tripping time ;

[0082] Obtain the longest branch line among the multiple interconnecting switch lines on both sides connected to the interconnecting switch, and obtain the first line and the second line respectively;

[0083] Based on the aforementioned delayed closing time The fault detection time The long delay and the short-time blocking tripping time The first maximum fault handling time of the first line and the second maximum fault handling time of the second line are obtained respectively.

[0084] Based on the first maximum fault handling time and the second maximum fault handling time, the initial switching time of the interconnection switch is obtained;

[0085] Based on the aforementioned delayed closing time The fault detection time The long delay The short-time blocking tripping time Based on the initial transfer time, the connection transfer of the line is executed.

[0086] Each side of the tie switch has a maximum fault handling time. If the longest branch switch level in a line on one side of the tie switch is N (N includes substation outgoing switches), then the maximum fault handling time = (the total number of fault handling times for those N switches) / (the maximum fault handling time for all N switches). +All of the N switches Take the maximum value from the calculation results on both sides, then the initial transfer time of the tie switch = maximum value + preset margin.

[0087] Among them, reference Figures 3-4 , Figure 3 In the text, S, C, and are not labeled. The corresponding S and C are both 0s. It is standardized to 3s, therefore it is not labeled.

[0088] Among them, the pre-set voltage delay closing time of the line switch is set. The specific steps include:

[0089] For the first sectionalizing switch of a multi-connection switch line, obtain the upstream circuit breaker of the sectionalizing switch. If there is no preset level difference in instantaneous overcurrent protection between the sectionalizing switch and the upstream circuit breaker, and the upstream circuit breaker is preset to have one automatic reclosing, then set the voltage-delayed closing time of the first sectionalizing switch. Set as the first preset duration;

[0090] For the first sectionalizing switch: there is a delay closing time. Related to the circuit breaker (CB): Assuming the CB is a single-closing circuit and the instantaneous overcurrent protection cannot create a reliable level difference with the instantaneous overcurrent protection of the first sectionalizing switch, it can be set as follows: It lasts for 21 seconds.

[0091] For non-first section switches and branch switches in multi-connection switch lines, the pressure-delayed closing time is mentioned. All are set to the second preset duration;

[0092] For non-first sectionalizing switches and branch switches: there is a delay closing time. It can be set directly to 5 seconds.

[0093] Wherein, the first preset duration is longer than the second preset duration. The first preset duration needs to take into account the charging time reserved for the substation to achieve the second reclosing when there is no step difference in line protection, and is generally greater than or equal to 21s. The second preset duration does not need to be considered and can be set to a smaller value, generally greater than or equal to 5s.

[0094] Among them, the closing time with pressure delay Greater than the fault detection time Because the fault handling process for the entire line involves coordination between the switches at different stages, except for the first sectionalizing switch, the other switches... / The times are 5s and 3s respectively, which are actually the front switch. Time and rear switch For example, in a stepless circuit, if the front switch... Time greater than the rear switch This can lead to a situation where, when the downstream switch closes to the fault, the fault trips to the substation, causing the upstream switch to lose power and open again, resulting in incorrect locking of the closing mechanism (locked closing means the automatic closing function is locked and no longer automatically closes; the state is in the open position. The correct procedure is for the switch closest to the fault on the upstream side to lock and close, while other upstream switches are not locked and closed). Therefore, there is a delay in the closing time. It must be greater than the fault detection time. For example, fault detection time. It can be directly set to 3 seconds, which is less than the closing time with pressure delay. .

[0095] Among them, reference Figures 3-4 Obtain the long delay of the circuit switch. The specific steps include:

[0096] For multi-connection switch lines before power transfer, determine whether the following conditions are met simultaneously:

[0097] Condition 1: Protection differential is missing, that is, there is no protection differential (i.e., there is a possibility of over-level tripping).

[0098] Condition 2: The line switch has feeder automation function;

[0099] Condition 3: The line switch has an undervoltage tripping function;

[0100] Condition 4: The circuit breaker has a peer switch;

[0101] If all conditions are met, then obtain the same-level switch of the line switch, obtain the first downstream branch line of the same-level switch, obtain the first number of switches of the first downstream branch line, and based on the first number of switches and the voltage-delayed closing time... Obtain the long delay of the line switch ;

[0102] If not all conditions are met, then the long delay Set to 0.

[0103] Taking the lines of substations 1 and 2 as examples, assuming the protection delays of the switches are identical, there is no protection level difference, and both have feeder automation and undervoltage tripping functions enabled. When a permanent short-circuit fault occurs after FD14, from the perspective of the power supply direction before the transfer, after FD12 recloses, FD13 and FZ11 will simultaneously receive power on the incoming side. Therefore, the equivalent switch of FD13 is FZ11. However, the fault is after FD14, and FD13 and FD14 must close first to isolate the fault. Therefore, FZ11 needs to be set with a long delay to avoid the total closing time of FD13 and FD14, and cannot close simultaneously. Therefore, the long delay of FZ11 is equal to the total closing time of FD13 and FD14. In this scenario, the automatic closing time of FZ11 is... =5+10=15.

[0104] Wherein, the long delay of the line switch is obtained. The first calculation formula is:

[0105] ;

[0106] in, Indicates a long delay. Indicates the number of the first switch. This indicates the closing time when there is a pressure delay.

[0107] Among them, reference Figure 3 Obtain the short-time blocking and tripping time of the line switch. The specific steps include:

[0108] For lines without protection level differences, obtain all second downstream branch lines of the line switches, obtain the number of second switches in the second downstream branch lines, obtain the maximum number of switch levels based on the number of second switches, obtain the target branch based on the maximum number of switch levels, i.e., the line branch with the largest number of switch levels, obtain all target switches of the target branch, and determine the voltage-delayed closing time of the target switches. Obtain the short-time blocking tripping time of the line switch. ;

[0109] Obtain the short-time blocking tripping time of the line switch. The second calculation formula is:

[0110] ;

[0111] in, Indicates the short-term blocking tripping time. Indicates the maximum number of switching stages. Indicates the first The voltage-delayed closing time of each target switch Represents an integer greater than or equal to 1.

[0112] The setting of the short-time blocking tripping time must avoid the sum of the voltage-delayed closing times of the largest branch of all switches downstream of this switch, assuming the maximum number of switch stages in the same branch downstream of this switch is... Then the short-time blocking tripping time = the time after the switch A switch The sum of .

[0113] Among them, the first maximum fault handling time of the first line and the second maximum fault handling time of the second line are obtained based on the first method;

[0114] The first method is:

[0115] Obtain the number of first switches and third switches of the input line (i.e., the first line or the second line), based on the number of third switches and the long delay of the first switches. With the aforementioned pressure-delayed closing time To obtain the maximum fault handling time;

[0116] The third calculation formula for obtaining the maximum fault handling time is:

[0117] ;

[0118] in, Indicates the maximum fault handling time. Indicates the number of third switches. Indicates the first The voltage-delayed closing time of the first switch Indicates the first The long delay of the first switch, Represents an integer greater than or equal to 1.

[0119] The time required to handle faults on both sides of the connecting switch is related to the number of switches on the line and the automatic closing time. The automatic closing time is calculated by taking the number of the longest branch.

[0120] by Figure 4 Taking LL1 as an example: The longest fault handling time corresponding to the left side of the line where LL1 is located is the fault handling time max1 of the entire line after the instantaneous fault occurs after CB1. max1 is the sum of the automatic closing times of the entire feeder from CB1 to FD14, max1 = 2 + 21 + 5 + 10 + 5 = 43s; The longest fault handling time corresponding to the right side of the line where LL1 is located is the fault handling time max2 of the entire line after the instantaneous fault occurs after CB2. max2 is the sum of the automatic closing times of the entire feeder from CB2 to FD22, max2 = 2 + 21 + 10 = 33s. Since max1 > max2, the automatic transfer time of LL1 is... =max1 + 5 (preset margin) = 48s, calculated according to this method. =54s, =54s, =43s, =48s, the calculation result is as follows Figure 5 As shown.

[0121] Interconnecting switch: A switching device used to connect different power supply lines in a dual power distribution system. It is usually installed in the interconnecting cabinet and achieves bidirectional power supply through the upper and lower inlet line design. When one side of the power supply fails, the load can be automatically transferred to the other side of the power supply, thereby improving the reliability of power supply.

[0122] Section switches are automatic switching devices used to isolate sections of a line. They are usually used in conjunction with reclosers or circuit breakers and can automatically trip when there is a loss of voltage or no current, isolating the faulty section to restore power supply.

[0123] Branch switch: A device used for the protection of branch lines and end-user lines. Its main function is to automatically disconnect faults to prevent the power outage area from expanding.

[0124] Pressure-delayed closing time refers to the time interval in a power system during which the automatic reclosing device delays the closing operation after power is restored to the line. It is mainly used to improve system stability and avoid fault current surges.

[0125] Fault detection time refers to the time required from the occurrence of a fault to the detection of the fault by the system or equipment.

[0126] In circuit breakers or power switching, long delay refers to the protection action (such as tripping or power switching) being triggered after a certain time delay when the current exceeds the set value.

[0127] Short-time blocking tripping time refers to the period during which the circuit breaker is unable to perform tripping operation due to the blocking mechanism during a short-term voltage interruption (such as a voltage drop to below 0.1 times the rated voltage for 3 seconds to 1 minute).

[0128] The power transfer time refers to the time from the occurrence of a power outage to the completion of the load switching to the backup power supply through the tie switch, which usually includes fault location, disconnect switch switching and other steps.

[0129] Example 2

[0130] refer to Figures 1-6 Based on Embodiment 1, in this embodiment, the method further includes:

[0131] refer to Figure 6 Based on the aforementioned long delay and the aforementioned pressure-delayed closing time Obtain the automatic closing time of the line switch;

[0132] Based on the line topology diagram and the preset rotation direction, a directed graph of the tie switch is obtained, and based on the directed graph and the automatic closing time, the transfer time difference between two adjacent tie switches is obtained.

[0133] like Figure 6 As shown, for example, if a fault occurs on the line where substation 2 is located, LL1 and LL2 will simultaneously activate their automatic power transfer functions. The longest automatic closing time for the switches between LL1 and LL2 is 5+5+5+5=20s. Considering a time margin of 5s, LL1 and LL2 must coordinate, and the time difference for power transfer should be at least [missing value]. =25s. Calculate the time difference between other switches using this method, such as... Figure 6 shown , , , and .

[0134] The initial transfer time is updated based on the update method to obtain the final transfer time of the contact switch;

[0135] The update method is as follows:

[0136] S1. Obtain an intermediate contact switch based on the minimum value of the initial transfer time;

[0137] S2. Based on the directed graph, obtain the communication switches on both sides adjacent to the middle communication switch to obtain the left communication switch and the right communication switch;

[0138] S3. Based on the initial transfer time, obtain the first time difference between the left and right contact switches and the middle contact switch, respectively, and obtain the new transfer time of the middle contact switch, the left contact switch and the right contact switch based on the first time difference and the transfer time difference.

[0139] S4. Obtain the downstream communication switch adjacent to the right communication switch, update the intermediate communication switch to the downstream communication switch, update the initial transfer time to the new transfer time, delete the new transfer time, return to S2, and continue until the termination condition is met, the iteration ends, and the final transfer time is obtained based on the initial transfer time.

[0140] The fourth calculation formula for obtaining the automatic closing time of the line switch is:

[0141] ;

[0142] in, Indicates a long delay. Indicates the number of the first switch. Indicates the time for closed-circuit operation with pressure delay. Indicates the automatic closing time.

[0143] The termination condition is as follows:

[0144] If the number of the communication switches is even, then the iteration ends when the downstream communication switch in S4 is the intermediate communication switch in S1.

[0145] If the number of the contact switches is odd, the iteration ends when the downstream contact switch in S4 is the left contact switch that first appeared in S2.

[0146] Wherein, when the downstream contact switch in S4 is the left contact switch that first appears in S2, the method further includes:

[0147] The left-side contact switch that first appears in S2 is identified as the first contact switch;

[0148] Obtain the connection switches on both sides adjacent to the first connection switch, and obtain the upstream connection switch and the initial connection switch;

[0149] Based on the final transfer time, a second time difference between the first contact switch and the initial contact switch is obtained; based on the second time difference and the transfer time difference, the first latest transfer time of the first contact switch is obtained.

[0150] Based on the final transfer time and the first latest transfer time, a third time difference between the first connecting switch and the upstream connecting switch is obtained. Based on the third time difference and the transfer time difference, a second latest transfer time of the upstream connecting switch is obtained.

[0151] refer to Figure 6 For example:

[0152] A. Use the switch with the shortest transfer time as the intermediate contact (if there is more than one, it can be randomly selected). Figure 6 The middle switch is LL1, and the connecting switches on the left and right are LL5 and LL2 respectively. The three connecting switches, centered on LL1, have a clockwise (counter-clockwise is also possible, but the direction cannot be changed midway) positional relationship as LL5-LL1-LL2. The switching time of LL1 remains constant. Recalculate the transfer times of LL5 and LL2 (the calculation order is not required), as follows:

[0153] 1) If ,but ;

[0154] 2) If ,but ;

[0155] Similarly,

[0156] 3) If ,but ;

[0157] 4) If ,but ,Right now Figure 6 In ;

[0158] The timeline for this group's data transfer has been updated.

[0159] B. Take the contact switch with the new, unupdated time in a clockwise direction (counterclockwise is also acceptable, but the direction cannot be changed midway once determined), which is LL3. Using LL3 as the middle contact, take the contact switches connected to it on the left and right, which are LL2 and LL4 respectively. Then the positional relationship of the three contacts is LL2-LL3-LL4, and the supply time of LL3 remains unchanged. Recalculate the transfer times of LL2 and LL4 (the calculation order is not required). (This calculation is performed based on the results of step A), and the method is as follows:

[0160] 1) If ,but ;

[0161] 2) If ,but ,Right now Figure 6 In ;

[0162] Similarly,

[0163] 3) If ,but ;

[0164] 4) If ,but ,Right now Figure 6 In ;

[0165] C. Repeat step B until the newly obtained switch is LL1 from step A, then end (this will happen when there are an even number of connections). However, if the encountered switch is not LL1, but the immediately following LL5 (this will happen when there are an odd number of connections), the following should be noted:

[0166] Since the other values ​​are calculated using LL1 as the starting value... The values ​​cannot be changed, therefore, when calculating the time set LL4-LL5-LL1, it is necessary to ensure... Unchanged, increased and The value is calculated as follows:

[0167] Calculation must be performed first Value:

[0168] 1) If ,but ;

[0169] 2) If ,but ,Right now Figure 6 In ;

[0170] Then according to The value, calculate Value:

[0171] 3) If ,but ;

[0172] 4) If ,but ,Right now Figure 6 In ;

[0173] The above method can be used to calculate Figure 5 The total contact transfer time of the line, such as Figure 6 As shown.

[0174] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0175] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A transfer coordination method of a multi-coloied switch circuit, characterized by, The method comprises: obtaining a line topology map of a target area, obtaining topology position information of line switches and tie switches based on the line topology map, the line switches comprising sectional switches and branch switches; The pressure delay closing time of the line switch is preset based on the topological position information and fault detection time ; based on the time to close the circuit breaker acquiring the long time to close the circuit breaker and the short time to open the circuit breaker ; obtaining the longest branch line in two-side multi-tie switch lines connected with the tie switch, and obtaining a first line and a second line respectively; based on the time-to-close and the time-to-close-to-open , the time-to-detect , the long time delay , and the short time delay , a first maximum fault handling time for the first line and a second maximum fault handling time for the second line, respectively. obtaining an initial transfer time of the tie switch based on the first maximum fault processing time and the second maximum fault processing time; based on the time-to-close with pressure , the time-to-detect fault , the long time delay , the short time-to-close open time and the initial time-to-transfer, performing a transfer of a tie line.

2. The transfer coordination method of a multi-contact switching line according to claim 1, characterized in that, Pre-set the line switch pressure time delay closing time The specific steps include: For the first sectional switch of a multi-contactor switch line, an upstream circuit breaker of the sectional switch is acquired, if preset level difference does not exist between the sectional switch and instantaneous trip protection of the upstream circuit breaker, and the upstream circuit breaker is preset with one-time automatic reclosing, the pressure delay closing time of the first sectional switch is set as the first preset time length is set as the first preset time length. For non-first section switches and branch switches in multi-connection switch lines, the pressure-delayed closing time is mentioned. All are set to the second preset duration; wherein the first preset time length is greater than the second preset time length.

3. The method of claim 1, wherein, The closing time of the circuit breaker Greater than the fault detection time .

4. The method of claim 1, wherein, acquiring a long delay of the line switch The specific steps include: For the multi-tie switch line before transfer, it is judged whether the following conditions are met simultaneously: Condition 1: protection level difference is missing; Condition 2: the line switch has feeder automation function; Condition 3: the line switch has loss of voltage tripping function; Condition 4: the line switch has same-level switches; If all conditions are met, then obtain a peer switch of the line switch, obtain a first downstream branch line of the peer switch, obtain a first switch quantity of the first downstream branch line, and obtain a pressure delay closing time based on the first switch quantity and the pressure delay closing time obtain the long delay of the line switch ; If all conditions are not met, the long delay is set to 0.

5. The transfer coordination method of a multi-contact switching line according to claim 4, characterized in that, obtaining the long delay of the line switch The first calculation formula is: ； wherein, represents a long delay, represents a first switch number, represents a pressure delay closing time.

6. The method of claim 1, wherein, Acquisition of the short-circuit opening time of a circuit breaker The specific steps include: For a line without a protection level difference, all second downstream branch lines of the line switch are obtained, a second switch quantity of the second downstream branch line is obtained, a maximum switch level is obtained based on the second switch quantity, a target branch is obtained based on the maximum switch level, all target switches of the target branch are obtained, and a pressurized delay closing time of the target switch is obtained based on the target switch The short-time locking opening time of the line switch is obtained ​ the short-time blocking opening time of the line switch The second calculation formula is: ； wherein, represents a short-time closed-brake time, represents a maximum switching stage number, represents a pressure delay closing time of the target switch, represents an integer greater than or equal to 1.

7. The method of claim 1, wherein, obtaining a first maximum fault processing time of the first line and a second maximum fault processing time of the second line based on a first mode; The first mode is: a first switch of an input line and a third switch quantity of the first switch, based on the third switch quantity and a long delay time of the first switch a pressure delay closing time a maximum fault handling time a third calculation formula for obtaining the maximum fault processing time is: ； wherein, represents the maximum fault handling time, represents the third switch number, represents the pressure closing time of the first switch, represents the long delay of the first switch, represents an integer greater than or equal to 1.

8. The method of claim 1, wherein, The method further comprises: based on the long delay and the pressurized delay closing time obtaining an automatic closing time of the line switch; obtaining a directed graph of the tie switch based on the line topology map and a preset rotation direction, obtaining a transfer time difference between two adjacent tie switches based on the directed graph and the automatic closing time; updating the initial transfer time based on an updating mode to obtain a final transfer time of the tie switch; The updating mode is: S1, obtaining an intermediate tie switch based on the minimum value of the initial transfer time; S2, obtaining a left tie switch and a right tie switch based on the directed graph and the intermediate tie switch adjacent to the intermediate tie switch; S3, obtaining a first time difference between the left tie switch and the right tie switch and the intermediate tie switch based on the initial transfer time respectively, and obtaining a new transfer time of the intermediate tie switch, the left tie switch and the right tie switch based on the first time difference and the transfer time difference; S4, obtaining a downstream tie switch adjacent to the right tie switch, updating the intermediate tie switch to the downstream tie switch, updating the initial transfer time to the new transfer time after deleting the new transfer time, returning to S2 until a termination condition is met, and ending the iteration, and obtaining the final transfer time based on the initial transfer time; a fourth calculation formula for obtaining the automatic closing time of the line switch is: ； wherein, represents a long delay, represents a first number of switches, represents a pressure delay closing time, represents an automatic closing time.

9. The transfer coordination method of a multi-contact switching line according to claim 8, characterized in that, The termination condition is: if the number of tie switches is even, the downstream tie switch in S4 is the intermediate tie switch in S1, and the iteration ends; if the number of tie switches is odd, the downstream tie switch in S4 is the left tie switch first appearing in S2, and the iteration ends.

10. The method of claim 9, wherein, When the downstream tie switch in S4 is the left tie switch first appearing in S2, the method further comprises: obtaining the left tie switch first appearing in S2 as a first tie switch; obtaining an upstream tie switch and an initial tie switch adjacent to the first tie switch; acquire a second time difference between the first tie switch and the initial tie switch based on the final transfer time, acquire a first latest transfer time of the first tie switch based on the second time difference and the transfer time difference; acquire a third time difference between the first tie switch and the upstream tie switch based on the final transfer time and the first latest transfer time, and acquire a second latest transfer time of the upstream tie switch based on the third time difference and the transfer time difference.

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