Self-adaptive spare power automatic switching method and related device

Abstract

The invention relates to the technical field of electric power safety management and control, in particular to an adaptive spare power automatic switching method and related device.The method comprises the steps that the three-phase voltage of a target bus, the voltage of a target power transmission line, the state of a section switch of the target bus and the state of a target line switch of the target power transmission line are obtained; when the three-phase voltage of any target bus is smaller than a first voltage threshold value, the voltage of any target power transmission line is smaller than a first voltage threshold value and the state of the target line switch is tripping, executing segmented spare power automatic switching operation; and when the state of the section switch is the operation state or the maintenance state, whether line spare power automatic switching operation is executed or not is determined according to the three-phase voltage of the target bus and the state of the target line switch, and the technical problems that an existing spare power automatic switching mode is low in efficiency and poor in safety are solved.

Description

Technical Field

[0001] This invention relates to the field of power safety management and control technology, and in particular to an adaptive backup and automatic transfer method and related devices. Background Technology

[0002] Automatic transfer switch (ATS) refers to the process of switching on a backup power source to restore power to the lost busbar when it loses voltage. Taking 110kV ATS as an example, to coordinate with the switching of primary equipment operating modes, it is necessary to frequently engage and disengage the maintenance switchboards of relevant components of the 110kV ATS to ensure its normal operation under different modes. Currently, the engagement and disengagement of ATS maintenance switchboards are mainly carried out by dispatchers or operators according to the requirements of the primary equipment operating mode and based on the equipment's instruction manual and operating procedures. However, this engagement and disengagement method is limited by the skill level and experience of maintenance personnel, resulting in low efficiency and poor safety. Summary of the Invention

[0003] This invention provides an adaptive backup automatic transfer method and related apparatus to solve the technical problems of low efficiency and poor security in existing backup automatic transfer methods.

[0004] This invention provides an adaptive backup and self-start method, comprising:

[0005] Acquire the three-phase voltage of the target bus, the voltage of the target transmission line, the status of the sectionalizing switch of the target bus, and the status of the target line switch of the target transmission line;

[0006] When the three-phase voltage of any of the target busbars is less than a preset first voltage threshold, and the voltage of any of the target transmission lines is less than the first voltage threshold, and the state of the target line switch set on the target transmission line is tripped, the segmented backup automatic transfer operation is executed.

[0007] When the sectionalizing switch is in the running state, and the three-phase voltage of all target buses is less than the first voltage threshold, and the state of all target line switches is tripped, the line backup automatic transfer operation is executed.

[0008] When the sectionalizing switch is in maintenance mode, and the three-phase voltage of any of the target busbars is less than the first voltage threshold, and all the target line switches are in tripped mode, the line backup automatic transfer operation is performed.

[0009] Optionally, before obtaining the three-phase voltage of the target bus and the voltage of the target transmission line, the method further includes:

[0010] Obtain the positions of the line disconnect switches and sectional disconnect switches directly connected to the busbar, and obtain the three-phase voltage of the busbar;

[0011] Determine whether the positions of each line disconnect switch and the section disconnect switch are both in the open position. If so, determine that the busbar is under maintenance; otherwise, determine that the busbar is not under maintenance.

[0012] When it is determined that the busbar is in a non-maintenance state, and the voltage of any phase of the three-phase voltage of the busbar is not less than a preset second voltage threshold, then the busbar is determined to be the target busbar.

[0013] Optionally, before obtaining the three-phase voltage of the target bus and the voltage of the target transmission line, the method further includes:

[0014] Obtain the position of the disconnect switch installed in the transmission line;

[0015] Determine whether the positions of all the disconnect switches on the lines are in the open position. If so, determine that the transmission line is under maintenance; otherwise, determine that the transmission line is not under maintenance.

[0016] Obtain and calculate the active power of the transmission line based on the three-phase current and three-phase voltage of the transmission line;

[0017] Determine whether the active power of the transmission line is greater than zero. If it is, the transmission line is determined to be a load line; otherwise, the transmission line is determined to be a non-load line.

[0018] Obtain the status of the line switch installed on the transmission line;

[0019] When it is determined that the transmission line is in a non-maintenance state, and the state of the line switch of the transmission line is closed, and when it is determined that the transmission line is a non-load line, the transmission line is determined to be the target transmission line.

[0020] Optionally, the step of obtaining the state of the sectionalizing switch of the target bus includes:

[0021] Obtain the positions of the segmented disconnectors located on both sides of the segmented switch;

[0022] Determine whether each of the segmented disconnectors is in the open position. If so, mark the segmented switch as being in maintenance mode; otherwise, mark the segmented switch as being in non-maintenance mode.

[0023] Optionally, the step of obtaining the state of the sectionalizing switch of the target bus further includes:

[0024] Obtain the position of the sectionalizing switch and obtain the three-phase voltage of the busbars on both sides of the sectionalizing switch;

[0025] When the sectionalizing switch is in a non-maintenance state, and any phase voltage of the three-phase voltage of the busbars on both sides of the sectionalizing switch is not less than the second voltage threshold, and the sectionalizing switch is in the closed position, the state of the sectionalizing switch is marked as the operating state.

[0026] Optionally, the method further includes:

[0027] Get the status of the automatic transfer switch pressure plate;

[0028] When the automatic transfer switch is in the activated state, the sectionalizing switch is in the closed position, any phase voltage of the three phases of each bus is not less than the second voltage threshold, and there is at least one target transmission line and at least one standby line in each transmission line, the automatic transfer charging operation is performed.

[0029] Optionally, the method further includes:

[0030] When the automatic transfer switch is in the activated state, the sectionalizing switch is in the open position, the sectionalizing switch is in the non-maintenance state, any phase voltage of the three phases of each bus is not less than the second voltage threshold, and there are at least two target transmission lines in each transmission line, the sectionalizing automatic transfer charging operation is performed.

[0031] Optionally, the step of determining the available backup line includes:

[0032] Obtain the voltage of the transmission line;

[0033] When the circuit breaker of the transmission line is in the closed state, the transmission line is in the non-maintenance state, and the voltage of the transmission line is not less than the second voltage threshold, the transmission line is determined to be a standby line.

[0034] The present invention also provides an adaptive backup and automatic transfer device, the device comprising:

[0035] The first acquisition module is used to acquire the three-phase voltage of the target bus, the voltage of the target transmission line, the status of the sectionalizing switch of the target bus, and the status of the target line switch of the target transmission line.

[0036] The first execution module is used to perform a segmented standby automatic transfer operation when the three-phase voltage of any of the target busbars is less than a preset first voltage threshold, and the voltage of any of the target transmission lines is less than the preset first voltage threshold, and the state of the target line switch set on the target transmission line is tripped.

[0037] The second execution module is used to execute a line backup automatic transfer operation when the state of the sectionalizing switch is running, the three-phase voltage of all the target buses is less than the first voltage threshold, and the state of all the target line switches is tripped.

[0038] The third execution module is used to perform a line backup automatic transfer operation when the state of the sectionalizing switch is under maintenance, the three-phase voltage of any of the target bus is less than the first voltage threshold, and the state of all the target line switches is tripped.

[0039] The present invention also provides an electronic device, the device including a processor and a memory;

[0040] The memory is used to store program code and transmit the program code to the processor;

[0041] The processor is used to execute the method described above according to the instructions in the program code.

[0042] As can be seen from the above technical solutions, the present invention has the following advantages:

[0043] This invention provides an adaptive automatic transfer switch method, comprising: acquiring the three-phase voltage of a target bus, the voltage of a target transmission line, the status of the sectionalizing switch of the target bus, and the status of the target line switch of the target transmission line; performing a sectionalizing automatic transfer switch operation when the three-phase voltage of any of the target buses is less than a preset first voltage threshold, and the voltage of any of the target transmission lines is less than the preset first voltage threshold, and the status of the target line switch set on the target transmission line is tripped; performing a line automatic transfer switch operation when the sectionalizing switch connected to the target bus is in operation, and the three-phase voltage of all the target buses is less than the first voltage threshold, and the status of all the target line switches is tripped; and performing a line automatic transfer switch operation when the sectionalizing switch is in maintenance, and the three-phase voltage of any of the target buses is less than the first voltage threshold, and the status of all the target line switches is tripped.

[0044] In this invention, by monitoring the three-phase voltage of the target busbar and the voltage of the target transmission line in operation, and by monitoring the status of the sectionalizing switch connected to the target busbar and the status of the target line switch located on the target transmission line, the required automatic transfer switch operation is identified and executed based on the three-phase voltage of the target busbar, the voltage of the target transmission line, the status of the sectionalizing switch, and the status of the target line switch. This achieves adaptive execution of the corresponding automatic transfer switch operation according to the operating status of the primary system, solving the technical problems of low efficiency and poor safety in existing automatic transfer switch methods, and improving the efficiency and safety of automatic transfer switch. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 A wiring diagram of the primary circuit of a power system provided in an embodiment of the present invention;

[0047] Figure 2 This is one of the schematic diagrams illustrating the steps of an adaptive backup and automatic switching method provided in an embodiment of the present invention;

[0048] Figure 3 This is a second schematic diagram illustrating the steps of an adaptive backup and automatic switching method provided in an embodiment of the present invention;

[0049] Figure 4 This is the third schematic diagram of the steps of an adaptive backup and automatic switching method provided in an embodiment of the present invention;

[0050] Figure 5 This is the fourth schematic diagram of the steps of an adaptive backup and automatic switching method provided in an embodiment of the present invention;

[0051] Figure 6 This is a schematic diagram of an adaptive backup and automatic switching device provided in an embodiment of the present invention. Detailed Implementation

[0052] In existing automatic transfer switch (ATS) devices (such as 110kV ATS devices), to simplify the device's operating logic, the 110kV ATS devices do not retrieve the position information of disconnectors and grounding switches. This results in the ATS devices being unable to automatically identify the operating status of the switches, requiring manual identification of the primary equipment's operating mode for ATS activation. However, this method is limited by the experience and skill level of maintenance personnel, and may lead to missed or incorrect activations. For example, during line maintenance, the maintenance switch plate for that line needs to be engaged. If this switch plate is not engaged, the ATS may fail to activate due to incorrect mode (e.g., the maintenance switch status is uncertain, possibly intermittently open or closed). Similarly, for load lines, the maintenance switch plate needs to be engaged to prevent accidental disconnection of load lines after ATS activation. If this is not engaged, the ATS device may mistakenly disconnect load lines, and so on. Therefore, the existing ATS methods suffer from inefficiency and safety issues.

[0053] This invention provides an adaptive automatic transfer switch method and related device. By introducing the position information of sectional switches, sectional disconnectors, line switches, and line disconnectors into the 110kV automatic transfer switch device, the operating mode of primary equipment can be automatically identified, thereby automatically judging the maintenance status of each component. This eliminates the need for maintenance personnel to frequently switch the switch on and off for maintenance, solving the technical problems of low efficiency and safety in existing automatic transfer switch methods, and improving the efficiency and safety of automatic transfer switch.

[0054] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0055] This invention provides an adaptive backup and automatic transfer method applied to the primary circuit of a power system. The primary circuit adopts a double-busbar sectionalized connection, comprising two busbars, each connecting to two transmission lines. The two busbars are connected via sectionalizing disconnectors and sectionalizing switches, with each end of the sectionalizing switch connected to a sectionalizing disconnector. Each transmission line is equipped with a line switch, with a line disconnector at each end. Each transmission line is connected to its corresponding busbar through one of these line disconnectors.

[0056] Each transmission line is equipped with a line voltage transformer for collecting voltage data, and each busbar is equipped with a busbar voltage transformer for collecting the three-phase busbar voltage. A line current transformer for collecting current data is installed between the end of each line switch furthest from the busbar and the line disconnector.

[0057] Taking a 110kV primary circuit as an example, its topology is as follows: Figure 1 As shown, Figure 1 In this diagram, 1M and 2M represent busbars, and lines #1, #2, #3, and #4 represent various transmission lines. 1111, 1112, 1113, and 1114 represent line switches installed on each transmission line. 11111, 11114, 11121, 11124, 11132, 11134, 11142, and 11144 represent line disconnectors installed on each transmission line. 10121 and 10122 represent sectionalizing disconnectors connected to each busbar. 1012 is a sectionalizing switch. 1CT, 2CT, 3CT, and 4CT are current transformers installed on each transmission line; #1PT and #2PT are voltage transformers installed on each busbar; and 1TYD, 2TYD, 3TYD, and 4TYD are voltage transformers installed on each transmission line.

[0058] Based on this structural diagram, the input signals that can be connected to the adaptive automatic transfer switch include: the closed positions of line switches 1111, 1112, 1113, and 1114; the closed position of sectionalizing switch 1012; the closed positions of line disconnectors 11111, 11114, 11121, 11124, 11132, 11134, 11142, and 11144; the closed positions of sectionalizing disconnectors 10121 and 10122; the closed positions of line switches 1111, 1112, 1113, and 1114; the status of the maintenance pressure plates for line #1, #2, #3, and #4; the maintenance pressure plates for busbar 1M and busbar 2M; the sectionalizing maintenance pressure plates; the status of the automatic transfer switch pressure plate; external interlocking input signals; and reset input signals.

[0059] Analog quantities that can be connected to the adaptive backup and automatic transfer device include: the three-phase voltage UA of the 1M bus. 1M UB 1M UC 1M The three-phase voltage UA of the 2M busbar 2M UB 2M UC 2M The three-phase currents of line #1 are IA1, IB1, and IC1; the three-phase currents of line #2 are IA2, IB2, and IC2; the three-phase currents of line #3 are IA3, IB3, and IC3; the three-phase currents of line #4 are IA4, IB4, and IC4; and the line voltages of line #1 are Ux1, line #2, line #3, and line #4 are Ux4, where Ux1, Ux2, Ux3, and Ux4 are phase voltages.

[0060] Please see Figure 2 The present invention provides an adaptive backup and automatic switching method, comprising:

[0061] 101. Obtain the three-phase voltage of the target bus, the voltage of the target transmission line, the status of the sectionalizing switch of the target bus, and the status of the target line switch of the target transmission line.

[0062] It should be noted that the target busbar refers to a busbar in operation. The target transmission line refers to a transmission line in operation. The sectionalizing switch of the target busbar refers to the sectionalizing switch connected to the target busbar, for example... Figure 1 The section switch shown in 1012 is an example. The target line switches of the target transmission line refer to the various line switches installed within the target transmission line, in order to... Figure 1 For example, assuming that line #1 is the target transmission line, the target line switch is 1111, and the voltage of the target transmission line is the line voltage Ux1.

[0063] The status of the target line switch includes whether it is tripped or closed.

[0064] The status of the sectionalizing switches of the target transmission line includes maintenance status, non-maintenance status, or operating status.

[0065] In one embodiment, the step of obtaining the state of the sectionalizing switch of the target bus includes:

[0066] S1. Obtain the positions of the sectionalizing disconnectors located on both sides of the sectionalizing switch;

[0067] S2. Determine whether the position of each section disconnect switch is in the open position. If so, mark the section switch status as maintenance status; otherwise, mark the section switch status as non-maintenance status.

[0068] It should be noted that, according to the topology of the primary circuit, each side of the sectionalizing switch is connected to a sectionalizing disconnector. The position of the sectionalizing disconnector includes either the open or closed position.

[0069] If each segment switch is in the open position, it means that the segment switch is under maintenance. Therefore, the state of the segment switch is under maintenance. Otherwise, it means that the segment switch is not under maintenance. Based on this, the state of the segment switch is not under maintenance.

[0070] When the sectionalizing switch is in maintenance mode, its displayed input quantity does not participate in the automatic transfer logic or anomaly judgment.

[0071] In one embodiment, the step of obtaining the state of the sectionalizing switch of the target bus further includes:

[0072] S3. Obtain the position of the sectionalizing switch and the three-phase voltage of the busbars on both sides of the sectionalizing switch.

[0073] It should be noted that the position of the sectionalizing switch includes both the closed and open positions. Based on the topology of the primary circuit, the two sides of the sectionalizing switch are connected to two busbars respectively. This step obtains the three-phase voltage of these two busbars.

[0074] S4. When the sectionalizing switch is in a non-maintenance state, and any phase voltage of the three-phase voltage of the busbars on both sides of the sectionalizing switch is not less than the second voltage threshold, and the sectionalizing switch is in the closed position, the sectionalizing switch is marked as being in operation.

[0075] It should be noted that the second voltage threshold is a voltage threshold value, used as a criterion for determining whether the line is under voltage. When the status of the sectionalizing switch is determined to be non-maintenance state according to S1-S2, it is further determined whether any phase voltage of the three phases of each busbar on both sides of the sectionalizing switch is not less than the second voltage threshold, and whether the position of the sectionalizing switch is closed. If both are true, it indicates that the sectionalizing switch is in the operating state, and the status of the sectionalizing switch is determined to be in the operating state.

[0076] It is understandable that step S3 is not sequential with steps S1-S2; it can be executed before S1-S2 or simultaneously with S1 or S2.

[0077] 102. When the three-phase voltage of any target bus is less than the preset first voltage threshold, and the voltage of any target transmission line is less than the preset first voltage threshold, and the state of the target line switch set on the target transmission line is tripped, the sectional backup automatic transfer operation is executed.

[0078] It should be noted that the first voltage threshold is a no-voltage threshold value, which serves as the criterion for determining whether the line is without voltage.

[0079] When the three-phase voltage of any target bus is less than a preset first voltage threshold Uwy, and the voltage of any target transmission line is less than the first voltage threshold Uwy, and the target line switch in the target transmission line with a voltage less than the first voltage threshold Uwy is in a tripped state, a sectionalized automatic transfer switch operation is executed. The sectionalized automatic transfer switch operation includes:

[0080] The system initiates a delay, and when the delay duration reaches the first preset duration Tt, it activates the automatic transfer switch. After activation, it immediately controls all line switches with voltages below the first voltage threshold to trip. Once all line switches with voltages below the first voltage threshold have tripped, the system initiates the delay again, and when the delay duration reaches the first preset duration Tt, it closes the sectionalizing switch.

[0081] 103. When the sectionalizing switch is in the running state, and the three-phase voltage of all target buses is less than the first voltage threshold, and the switch of all target lines is in the tripped state, the automatic transfer operation of the line backup is executed.

[0082] 104. When the sectionalizing switch is in maintenance mode, and the three-phase voltage of any target bus is less than the first voltage threshold, and all target line switches are in tripped mode, the line backup automatic transfer operation shall be performed.

[0083] It should be noted that the conditions for determining whether to perform automatic transfer operation of the line backup switch vary depending on the state of the sectionalizing switch.

[0084] Specifically, when the sectionalizing switch is in operation, if the three-phase voltages of both target buses are less than the first voltage threshold Uwy, and all target line switches have tripped, a line automatic transfer switch operation is executed. When the sectionalizing switch is under maintenance, if the three-phase voltage of one target bus is less than the first voltage threshold, and all target line switches have tripped, a line automatic transfer switch operation is executed.

[0085] The steps for automatic transfer switching on the backup line include:

[0086] The system initiates a delay, and when the delay duration reaches the preset second duration Tq, it activates the automatic transfer switch and immediately controls all target line switches to trip. After all target line switches have tripped, the system initiates another delay, and when the delay duration reaches the first duration Tt, it closes the line switch of the standby line, thereby enabling the standby line to supply power to the busbar after the voltage loss.

[0087] In practical applications, backup lines can be selected from various transmission lines.

[0088] It is understood that in the automatic transfer switch operation performed in this embodiment, after the automatic transfer switch is activated, all target line switches are immediately controlled to trip, thereby avoiding the situation where the automatic transfer switch closes the faulty line when the backup line is closed if the line switch is not tripped, thus further improving the safety of line operation.

[0089] In this embodiment, by monitoring the three-phase voltage of the target busbar and the voltage of the target transmission line in operation, and monitoring the status of the sectionalizing switch connected to the target busbar and the status of the target line switch set on the target transmission line, the required automatic transfer switch operation is identified and executed based on the three-phase voltage of the target busbar, the voltage of the target transmission line, the status of the sectionalizing switch, and the status of the target line switch. This achieves adaptive execution of the corresponding automatic transfer switch operation according to the operating status of the primary system, solving the technical problems of low efficiency and poor security in existing automatic transfer switch methods, and improving the efficiency and security of automatic transfer switch.

[0090] It is understood that there is no sequential relationship between steps 102 and 104; they can be performed simultaneously or sequentially. This embodiment takes sequential execution as an example.

[0091] In one embodiment, see Figure 3 Before step 101, the adaptive backup and automatic switching method provided in this embodiment of the invention further includes:

[0092] 201. Obtain the positions of the line disconnect switches and sectional disconnect switches directly connected to the busbar, and obtain the three-phase voltage of the busbar.

[0093] It should be noted that in this embodiment, steps 201 to 203 are performed for each bus in the primary circuit. Based on the topology of the primary circuit, the line disconnectors and sectional disconnectors directly connected to the bus can be determined. For example, for bus 1M, the line disconnectors directly connected to bus 1M are 11111 and 11121, and the sectional disconnector connected to bus 1M is 10121. For bus 2M, the line disconnectors directly connected to bus 2M are 11132 and 11142, and the sectional disconnector directly connected to bus 2M is 10122.

[0094] The position of a line disconnect switch includes either the closed or open position. The position of a section disconnect switch also includes either the closed or open position.

[0095] 202. Determine whether the positions of the disconnect switches on each line and the sectional disconnect switches are both in the open position. If so, the busbar is determined to be under maintenance; otherwise, the busbar is determined to be in non-maintenance condition.

[0096] It should be noted that when each line disconnector directly connected to the busbar is in the open position, and the section disconnector directly connected to the busbar is in the open position, it indicates that the busbar is under maintenance; otherwise, the busbar is not under maintenance.

[0097] For example: For busbar 1M, when line disconnectors 11111, 11121 and sectional disconnector 10121 are simultaneously in the open position, busbar 1M is determined to be under maintenance; otherwise, it is in a non-maintenance state. For busbar 2M, when line disconnectors 11132, 11142 and sectional disconnector 10122 are simultaneously in the open position, busbar 1M is determined to be under maintenance; otherwise, it is in a non-maintenance state.

[0098] When the busbar is under maintenance, the electrical quantities it displays are not involved in the automatic transfer switch logic or anomaly detection.

[0099] 203. When it is determined that the busbar is in a non-maintenance state, and the voltage of any phase of the three-phase voltage of the busbar is not less than the preset second voltage threshold, the busbar is determined to be the target busbar.

[0100] It should be noted that after determining that the busbar is in a non-maintenance state through step 202, it is further determined whether the voltage of any one of the three phases of the busbar is not less than the preset second voltage threshold. If so, it means that the busbar is in operation and is determined to be the target busbar. Otherwise, the busbar is not in operation and is not the target busbar.

[0101] As can be seen from the above, based on steps 201 to 203, the target busbar was determined from the primary circuit, providing strong technical support for the subsequent implementation of automatic backup switching.

[0102] In one embodiment, see Figure 4 Before step 101, the adaptive backup and automatic switching method provided in this embodiment of the invention further includes:

[0103] 301. Obtain the position of the line disconnector installed in the transmission line;

[0104] It should be noted that in this embodiment, steps 301 to 306 are performed for each transmission line in the primary circuit. The line disconnectors in the transmission lines can be determined based on the topology of the primary circuit. Each transmission line has two line disconnectors, located at opposite ends of the line switch. For example: for transmission line #1, the line disconnectors are 11111 and 11114; for transmission line #2, the line disconnectors are 11121 and 11124; for transmission line #3, the line disconnectors are 11131 and 11134; and for transmission line #4, the line disconnectors are 11142 and 11144.

[0105] The position of the line disconnect switch includes the closed or open position.

[0106] 302. Determine whether the positions of the disconnect switches on each line are all in the open position. If so, the transmission line is determined to be under maintenance; otherwise, the transmission line is determined to be in non-maintenance condition.

[0107] It should be noted that the system determines whether all disconnectors in the transmission line are in the open position. If so, the transmission line is considered to be under maintenance; otherwise, it is considered to be in non-maintenance condition.

[0108] For example: When both disconnectors 11111 and 11114 on both sides of line switch 1111 in transmission line #1 are simultaneously in the open position, transmission line #1 is determined to be under maintenance. When both disconnectors 11121 and 11124 on both sides of line switch 1112 in transmission line #2 are simultaneously in the open position, transmission line #2 is determined to be under maintenance. When both disconnectors 11131 and 11134 on both sides of line switch 1113 in transmission line #3 are simultaneously in the open position, transmission line #3 is determined to be under maintenance. When both disconnectors 11142 and 11144 on both sides of line switch 1114 in transmission line #4 are simultaneously in the open position, transmission line #4 is determined to be under maintenance.

[0109] When the transmission line is under maintenance, the displayed input and electrical quantities are not involved in the automatic transfer logic and anomaly judgment.

[0110] 303. Obtain and calculate the active power of the transmission line based on the three-phase current and three-phase voltage of the transmission line.

[0111] It should be noted that three-phase current includes phase A current, phase B current, and phase C current. Three-phase voltage includes phase A voltage, phase B voltage, and phase C voltage. The formula for calculating the active power of a transmission line is: Active power = Phase A voltage * Phase A current * Phase A power factor + Phase B voltage * Phase B current * Phase B power factor + Phase C voltage * Phase C current * Phase C power factor.

[0112] For example:

[0113] The active power P1 of transmission line #1 is given by: P1 = UA1 * IA1 * cosφA1 + UB1 * IB1 * cosφB1 + UC1 * IC1 * cosφC1; where cosφA1 is the power factor of phase A, cosφB1 is the power factor of phase B, and cosφC1 is the power factor of phase C; IA1, IB1, and IC1 are the phase A current, phase B current, and phase C current of transmission line #1, respectively; and UA1, UB1, and UC1 are the phase A voltage, phase B voltage, and phase C voltage of transmission line #1, respectively.

[0114] The active power P2 of transmission line #2 is given by: P2 = UA2 * IA2 * cosφA2 + UB2 * IB2 * cosφB2 + UC2 * IC2 * cosφC2; where cosφA2 is the power factor of phase A, cosφB2 is the power factor of phase B, and cosφC2 is the power factor of phase C; IA2, IB2, and IC2 are the phase A current, phase B current, and phase C current of transmission line #2, respectively; and UA2, UB2, and UC2 are the phase A voltage, phase B voltage, and phase C voltage of transmission line #2, respectively.

[0115] The active power P3 of transmission line #3 is given by: P3 = UA3 * IA3 * cosφA3 + UB3 * IB3 * cosφB3 + UC3 * IC3 * cosφC3; where cosφA3 is the power factor of phase A, cosφB3 is the power factor of phase B, and cosφC3 is the power factor of phase C; IA3, IB3, and IC3 are the phase A current, phase B current, and phase C current of transmission line #3, respectively; and UA3, UB3, and UC3 are the phase A voltage, phase B voltage, and phase C voltage of transmission line #3, respectively.

[0116] The active power P4 of transmission line #4 is calculated as follows: P4 = UA4 * IA4 * cosφA4 + UB4 * IB4 * cosφB4 + UC4 * IC4 * cosφC4. Here, cosφA4 represents the power factor of phase A, cosφB4 represents the power factor of phase B, and cosφC4 represents the power factor of phase C. IA4, IB4, and IC4 represent the phase A, phase B, and phase C currents of transmission line #4, respectively; UA4, UB4, and UC4 represent the phase A, phase B, and phase C voltages of transmission line #4, respectively.

[0117] 304. Determine whether the active power of the transmission line is greater than zero. If so, the transmission line is determined to be a load line; otherwise, the transmission line is determined to be a non-load line.

[0118] It should be noted that when the active power of a transmission line is greater than zero, it indicates that the transmission line is a load line, and the displayed input quantity does not participate in the automatic transfer switch logic. When the active power of a transmission line is less than or equal to zero, it indicates that the transmission line is a non-load line.

[0119] For example: When the active power P1 of transmission line #1 is greater than 0, then transmission line #1 is a non-load line. When the active power P2 of transmission line #2 is greater than 0, then transmission line #2 is a non-load line. When the active power P3 of transmission line #3 is greater than 0, then transmission line #3 is a non-load line. When the active power P4 of transmission line #4 is greater than 0, then transmission line #4 is a non-load line.

[0120] 305. Obtain the status of the line switches installed on the transmission line;

[0121] 306. When it is determined that the transmission line is in a non-maintenance state, and the state of the line switch of the transmission line is closed, and it is determined that the transmission line is a non-load line, the transmission line is determined to be the target transmission line.

[0122] It should be noted that when it is determined through steps 301-302 that the transmission line is in a non-maintenance state, and through steps 303-304 that the transmission line is a non-load line, it is further determined whether the status of the line switch in the transmission line is closed. If so, the transmission line is determined to be in operation state, which is the target transmission line.

[0123] Based on steps 301 to 306 above, this embodiment identifies the target transmission line from each transmission line of the primary circuit, providing strong technical support for subsequent identification of automatic transfer switch operations.

[0124] It is understood that steps 301-302, 303 to 304, and 305 are not sequential; they can be performed simultaneously or sequentially. This embodiment uses sequential execution as an example. Steps 301-306 and 201-203 can be performed simultaneously or sequentially, and their order can be set based on actual needs.

[0125] In one embodiment, see Figure 5 Before performing line backup automatic transfer operation or segment backup automatic transfer operation, the adaptive backup automatic transfer method provided in this embodiment of the invention further includes:

[0126] 401. Obtain the status of the backup automatic transfer switch pressure plate.

[0127] It should be noted that the status of the automatic switching function switch includes both the active and inactive states.

[0128] 402. When the standby automatic transfer function pressure plate is in the activated state, the sectionalizing switch is in the closed position, any phase voltage of the three phase voltage of each bus is not less than the second voltage threshold, and there is at least one target transmission line and at least one standby line in each transmission line, the line standby automatic transfer charging operation is performed.

[0129] It should be noted that in this embodiment, the system determines whether the standby automatic transfer function pressure plate is in the activated state, whether the sectionalizing switch is in the closed position, whether any phase voltage in the three phases of each bus in the two bus sections of the primary circuit is not less than the second voltage threshold, and whether there is at least one target transmission line and at least one standby line in each transmission line. If all three determinations are yes, it means that the standby automatic transfer device needs to enter the line standby automatic transfer charging state and perform charging operation.

[0130] It is understandable that the automatic transfer switch enters the automatic transfer charging state and charges itself so that there is sufficient power to perform the automatic transfer operation. Thus, when the automatic transfer operation is required, it will perform the automatic transfer operation to connect the backup power supply to the undervoltage bus and restore power supply.

[0131] In one example, the steps for determining a standby line include:

[0132] S21. Obtain the voltage of the transmission line;

[0133] S22. When the line switch of the transmission line is in the closed state, the transmission line is in the non-maintenance state, and the voltage of the transmission line is not less than the second voltage threshold, the transmission line is determined to be a standby line.

[0134] It should be noted that in this example, steps S21-S22 are performed for each transmission line in the primary circuit to determine the available backup lines from each transmission line. Step S22 can be performed simultaneously with step 306, or before step 306, or after step 306.

[0135] This example determines a transmission line as a standby line by judging whether the line switch of the transmission line is closed, whether the transmission line is in a non-maintenance state, and whether the voltage of the transmission line is not less than a second voltage threshold. If all three judgments are true, the transmission line is determined to be a standby line, thus realizing the determination of a standby line.

[0136] 403. When the automatic transfer switch is in the activated state, the sectionalizing switch is in the open position, the sectionalizing switch is in the non-maintenance state, any phase voltage of the three phases of each bus is not less than the second voltage threshold, and there are at least two target transmission lines in each transmission line, the sectionalizing automatic transfer charging operation is performed.

[0137] It should be noted that in this embodiment, the system determines whether the standby automatic transfer function pressure plate is in the activated state, whether the sectionalizing switch is in the detached position, whether any phase voltage of the three phases of each bus in the two bus sections of the primary circuit is not less than the second voltage threshold, and whether there are two or fewer target transmission lines in each transmission line. If all three determinations are true, it means that the standby automatic transfer device needs to enter the sectional standby automatic transfer charging state and perform charging operation.

[0138] The automatic transfer switch enters the sectional automatic transfer charging state and charges to ensure sufficient power for the sectional automatic transfer operation. Thus, when sectional automatic transfer is required, the operation is performed to restore power supply.

[0139] It is understood that there is no sequential relationship between steps 402 and 403; they can be performed simultaneously or sequentially. This embodiment takes sequential execution as an example.

[0140] See Figure 6 An adaptive backup and automatic switching device provided in this embodiment of the invention includes:

[0141] The first acquisition module 501 is used to acquire the three-phase voltage of the target bus, the voltage of the target transmission line, the status of the sectionalizing switch of the target bus, and the status of the target line switch of the target transmission line.

[0142] The first execution module 502 is used to perform a segmented standby automatic transfer operation when the three-phase voltage of any target bus is less than a preset first voltage threshold, and the voltage of any target transmission line is less than a preset first voltage threshold, and the state of the target line switch set on the target transmission line is tripped.

[0143] The second execution module 503 is used to execute the line backup automatic transfer operation when the sectionalizing switch is in the running state, the three-phase voltage of all target buses is less than the first voltage threshold, and the state of all target line switches is tripped.

[0144] The third execution module 504 is used to perform a line backup automatic transfer operation when the sectionalizing switch is in maintenance state, the three-phase voltage of any target bus is less than the first voltage threshold, and the state of all target line switches is tripped.

[0145] In one embodiment, the apparatus further includes:

[0146] The second acquisition module is used to acquire the position of the line disconnect switch and the section disconnect switch directly connected to the busbar, and to acquire the three-phase voltage of the busbar;

[0147] The first judgment module is used to determine whether the positions of the disconnect switches of each line and the section disconnect switches are both in the open position. If so, the busbar is determined to be in maintenance status; otherwise, the busbar is determined to be in non-maintenance status.

[0148] The second judgment module is used to determine the busbar as the target busbar when the busbar is in a non-maintenance state and the voltage of any phase of the three-phase voltage of the busbar is not less than a preset second voltage threshold.

[0149] In one embodiment, the apparatus further includes:

[0150] The third acquisition module is used to acquire the position of the line disconnectors set in the transmission line;

[0151] The third judgment module is used to determine whether the position of each line disconnect switch is in the open position. If so, the transmission line is determined to be under maintenance; otherwise, the transmission line is determined to be in non-maintenance state.

[0152] The fourth acquisition module is used to acquire and calculate the active power of the transmission line based on the three-phase current and three-phase voltage of the transmission line.

[0153] The fourth judgment module is used to determine whether the active power of the transmission line is greater than zero. If it is, the transmission line is determined to be a load line; otherwise, the transmission line is determined to be a non-load line.

[0154] The fifth acquisition module is used to acquire the status of the line switches installed on the transmission line;

[0155] The fifth judgment module is used to determine the transmission line as the target transmission line when it is determined that the transmission line is in a non-maintenance state, the line switch of the transmission line is in the closed state, and the transmission line is a non-load line.

[0156] In one embodiment, the first acquisition module 501 is specifically used to acquire the positions of the sectionalizing disconnectors located on both sides of the sectionalizing switch; determine whether the positions of each sectionalizing disconnector are all in the sectionalizing position; if so, mark the state of the sectionalizing switch as the maintenance state; otherwise, mark the state of the sectionalizing switch as the non-maintenance state.

[0157] In one embodiment, the first acquisition module 501 is specifically used to acquire the position of the sectionalizing switch and the three-phase voltage of the busbars on both sides of the sectionalizing switch; when the state of the sectionalizing switch is non-maintenance state, and any phase voltage of the three-phase voltage of the busbars on both sides of the sectionalizing switch is not less than the second voltage threshold, and the position of the sectionalizing switch is closed, the state of the sectionalizing switch is marked as running state.

[0158] In one embodiment, the apparatus further includes:

[0159] The sixth acquisition module is used to acquire the status of the backup automatic transfer function pressure plate;

[0160] The fourth execution module is used to perform a line backup automatic transfer charging operation when the backup automatic transfer function pressure plate is in the activated state, the sectionalizing switch is in the closed position, the voltage of any phase of the three-phase voltage of each bus is not less than the second voltage threshold, and there is at least one target transmission line and at least one backup line in each transmission line.

[0161] In one embodiment, the apparatus further includes:

[0162] The fifth execution module is used to perform a sectionalized automatic transfer charging operation when the standby automatic transfer function pressure plate is in the activated state, the sectionalizing switch is in the open position, the sectionalizing switch is in the non-maintenance state, any phase voltage of the three-phase voltage of each bus is not less than the second voltage threshold, and there are at least two target transmission lines in each transmission line.

[0163] In one embodiment, the apparatus further includes:

[0164] The seventh acquisition module is used to acquire the voltage of the transmission line;

[0165] The sixth judgment module is used to determine that a transmission line is a standby line when the status of the line switch of the transmission line is closed, the status of the transmission line is not under maintenance, and the voltage of the transmission line is not less than the second voltage threshold.

[0166] This invention also provides an electronic device, which includes a processor and a memory;

[0167] The memory is used to store program code and transfer the program code to the processor;

[0168] The processor is used to execute the methods of any of the above embodiments according to instructions in the program code.

[0169] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0170] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0171] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0172] Furthermore, in the various embodiments of the present invention, the functional units can be integrated into one processing unit, or each functional unit can be a separate physical entity, or two or more functional units can be integrated into one processing unit. The integrated unit described above can be implemented in hardware or as a software functional unit.

[0173] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0174] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0175] It should also be noted that in the description of this invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0176] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An adaptive backup and automatic switching method, characterized in that, include: Acquire the three-phase voltage of the target bus, the voltage of the target transmission line, the status of the sectionalizing switch of the target bus, and the status of the target line switch of the target transmission line; When the three-phase voltage of any of the target busbars is less than a preset first voltage threshold, and the voltage of any of the target transmission lines is less than the first voltage threshold, and the state of the target line switch set on the target transmission line is tripped, the segmented backup automatic transfer operation is executed. When the sectionalizing switch is in the running state, and the three-phase voltage of all target buses is less than the first voltage threshold, and the state of all target line switches is tripped, the line backup automatic transfer operation is executed. When the sectionalizing switch is in maintenance mode, and the three-phase voltage of any of the target busbars is less than the first voltage threshold, and all the target line switches are in tripped mode, the line backup automatic transfer operation is performed.

2. The method according to claim 1, characterized in that, Before obtaining the three-phase voltage of the target bus and the voltage of the target transmission line, the following steps are also included: Obtain the positions of the line disconnect switches and sectional disconnect switches directly connected to the busbar, and obtain the three-phase voltage of the busbar; Determine whether the positions of each line disconnect switch and the section disconnect switch are both in the open position. If so, determine that the busbar is under maintenance; otherwise, determine that the busbar is not under maintenance. When it is determined that the busbar is in a non-maintenance state, and the voltage of any phase of the three-phase voltage of the busbar is not less than a preset second voltage threshold, then the busbar is determined to be the target busbar.

3. The method according to claim 2, characterized in that, Before obtaining the three-phase voltage of the target bus and the voltage of the target transmission line, the following steps are also included: Obtain the position of the disconnect switch installed in the transmission line; Determine whether the positions of all the disconnect switches on the lines are in the open position. If so, determine that the transmission line is under maintenance; otherwise, determine that the transmission line is not under maintenance. Obtain and calculate the active power of the transmission line based on the three-phase current and three-phase voltage of the transmission line; Determine whether the active power of the transmission line is greater than zero. If it is, the transmission line is determined to be a load line; otherwise, the transmission line is determined to be a non-load line. Obtain the status of the line switch installed on the transmission line; When it is determined that the transmission line is in a non-maintenance state, and the state of the line switch of the transmission line is closed, and when it is determined that the transmission line is a non-load line, the transmission line is determined to be the target transmission line.

4. The method according to claim 2, characterized in that, The steps for obtaining the status of the sectionalizing switch of the target bus include: Obtain the positions of the segmented disconnectors located on both sides of the segmented switch; Determine whether each of the segmented disconnectors is in the open position. If so, mark the segmented switch as being in maintenance mode; otherwise, mark the segmented switch as being in non-maintenance mode.

5. The method according to claim 4, characterized in that, The steps for obtaining the state of the sectionalizing switch of the target busbar also include: Obtain the position of the sectionalizing switch and obtain the three-phase voltage of the busbars on both sides of the sectionalizing switch; When the sectionalizing switch is in a non-maintenance state, and any phase voltage of the three-phase voltage of the busbars on both sides of the sectionalizing switch is not less than the second voltage threshold, and the sectionalizing switch is in the closed position, the state of the sectionalizing switch is marked as the operating state.

6. The method according to claim 2, characterized in that, The method further includes: Get the status of the automatic transfer switch pressure plate; When the automatic transfer switch is in the activated state, the sectionalizing switch is in the closed position, any phase voltage of the three phases of each bus is not less than the second voltage threshold, and there is at least one target transmission line and at least one standby line in each transmission line, the automatic transfer charging operation is performed.

7. The method according to claim 6, characterized in that, The method further includes: When the automatic transfer switch is in the activated state, the sectionalizing switch is in the open position, the sectionalizing switch is in the non-maintenance state, any phase voltage of the three phases of each bus is not less than the second voltage threshold, and there are at least two target transmission lines in each transmission line, the sectionalizing automatic transfer charging operation is performed.

8. The method according to claim 6, characterized in that, The steps for determining which lines are eligible for backup include: Obtain the voltage of the transmission line; When the circuit breaker of the transmission line is in the closed state, the transmission line is in the non-maintenance state, and the voltage of the transmission line is not less than the second voltage threshold, the transmission line is determined to be a standby line.

9. An adaptive backup and automatic switching device, characterized in that, The device includes: The first acquisition module is used to acquire the three-phase voltage of the target bus, the voltage of the target transmission line, the status of the sectionalizing switch of the target bus, and the status of the target line switch of the target transmission line. The first execution module is used to perform a segmented standby automatic transfer operation when the three-phase voltage of any of the target busbars is less than a preset first voltage threshold, and the voltage of any of the target transmission lines is less than the preset first voltage threshold, and the state of the target line switch set on the target transmission line is tripped. The second execution module is used to execute a line backup automatic transfer operation when the state of the sectionalizing switch is running, the three-phase voltage of all the target buses is less than the first voltage threshold, and the state of all the target line switches is tripped. The third execution module is used to perform a line backup automatic transfer operation when the state of the sectionalizing switch is under maintenance, the three-phase voltage of any of the target bus is less than the first voltage threshold, and the state of all the target line switches is tripped.

10. An electronic device, characterized in that, The device includes a processor and a memory; The memory is used to store program code and transmit the program code to the processor; The processor is configured to execute the method as described in any one of claims 1-8 according to instructions in the program code.

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