Low-voltage flexible interconnection system and low-voltage flexible self-healing method

Abstract

The invention provides a low-voltage flexible interconnection system and a low-voltage flexible self-healing method, and the system comprises a sensing and remote control module which is used for collecting the multi-element power grid parameter information and switch position information of a line; a loop closing and opening multi-dimensional fusion decision and control module which is internally provided with a loop closing and opening synchronous compensation mechanism and is used for acquiring multi-element power grid parameter information and switch position information in real time and determining whether a loop closing and opening locking condition is met or not according to the multi-element power grid parameter information and the switch position information; and if the conditions are met, the control module is also used for sending a control instruction to control the first incoming line switch module, the second incoming line switch module or the bus coupler switch module to perform loop closing and opening operation according to a loop closing and opening synchronous compensation mechanism. The automatic loop closing and opening process is achieved, loop current is avoided, at least one path of incoming line supplies power at any moment when loop closing and opening operation is carried out, and voltage loss is avoided.

Description

Technical Field

[0001] This invention relates to the field of multi-source power grids, and more particularly to a low-voltage flexible interconnection system and a low-voltage flexible self-healing method. Background Technology

[0002] Current power switching operations in distribution rooms pose significant risks. For example, manual cold switching can cause power outages for users, while manual hot switching involves long loop closing times, increasing the risk of electrical damage, and lacks automatic transfer switching functionality. Anti-misoperation systems can only perform rigid "yes / no" static interlocking, lacking dynamic early warning and adaptive recovery capabilities for complex operations, making uninterrupted power switching impossible. The absence of intelligent automatic transfer switching means that recovery after a fault relies on manual intervention, resulting in slow response times and an inability to achieve millisecond-level fault isolation and automatic power switching, failing to meet the resilience and self-healing requirements of modern power distribution networks.

[0003] Currently, the automation control schemes for low-voltage flexible interconnection systems suffer from communication and control response delays in various hardware components, as well as limited accuracy in monitoring grid parameters, making it difficult to meet millisecond-level dynamic adjustment requirements. The design of power supply path switching between multiple distribution areas is complex, lacking efficient fault diagnosis and control path solutions. Furthermore, during the "hot switching" process with dual power supply lines, there is often a potential equivalent "circulating voltage source," and the circulating inrush current poses a serious threat to the attenuation characteristics. During the "hot switching" process, circuit protection trips. It is difficult to ensure the power supply quality to users during "hot switching," and to control the circulating current energy during operation without affecting users' power supply needs, ensuring the safety of primary equipment and the safe and stable operation of the power grid.

[0004] Therefore, in order to solve the above-mentioned technical problems existing in traditional manual operation and current automation solutions, this invention provides a low-voltage flexible interconnection system and a low-voltage flexible self-healing method. Summary of the Invention

[0005] To overcome the aforementioned technical deficiencies, the present invention aims to provide a low-voltage flexible interconnection system and a low-voltage flexible self-healing method. By monitoring and integrating multi-dimensional information such as multi-source grid parameters and switch position information through a multi-dimensional fusion decision and control module for loop merging and dismerging, and utilizing a loop merging and dismerging synchronous compensation mechanism, the system achieves zero circulating current during the loop merging and dismerging process. Simultaneously, at least one incoming line is supplying power at any given time during the loop merging and dismerging operation, ensuring no voltage loss and enabling seamless operation with significantly improved performance.

[0006] This invention provides a low-voltage flexible interconnection system, comprising: a first incoming line and a first busbar, and a second incoming line and a second busbar; a first incoming line switch module is provided on the first incoming line, a second incoming line switch module is provided on the second incoming line, and a bus tie switch module is further provided between the first busbar and the second busbar; the device further includes: The sensing and remote control module is communicatively connected to the first incoming line switch module, the second incoming line switch module, and the bus tie switch module, and is used to collect the switch position information and multi-element power grid parameter information of the line; the multi-element power grid parameter information includes the voltage, current, and angle difference of the incoming line, and the voltage, current, and angle difference of the bus line; the switch position information includes the closed position and the tripped position. The multi-dimensional fusion decision and control module for combining and dissolving loops is configured with a synchronization compensation mechanism for combining and dissolving loops; and it is communicatively connected to the sensing and remote sensing module; the synchronization compensation mechanism for combining and dissolving loops represents a compensation mechanism that aligns the actual execution time of loop closing with the actual execution time of loop dissolving; and is used for: The system acquires the multi-element power grid parameter information and the switch position information in real time, and determines whether the combined / disjoint loop blocking condition is met based on the multi-element power grid parameter information and the switch position information; if the condition is met, it is further used for: Based on the aforementioned loop-to-loop synchronization compensation mechanism, control commands are sent to control the first incoming line switch module, the second incoming line switch module, or the bus tie switch module to perform loop-to-loop operation.

[0007] Optionally, the combined loop interlocking conditions include: switch position information, angle difference conditions, incoming line voltage conditions, bus voltage conditions, incoming line current conditions, and interlocking activation conditions.

[0008] Optionally, the ring-merging and ring-unmerging synchronization compensation mechanism includes: a synchronization mechanism that aligns the actual execution time of ring-merging with the actual execution time of ring-unmerging by performing delay compensation on the execution time of ring-merging instructions and ring-unmerging instructions respectively.

[0009] Optionally, the ring-merging and ring-unmerging synchronization compensation mechanism includes: a synchronization mechanism that aligns the actual execution time of ring-merging with the actual execution time of ring-unmerging by separately compensating for the sum of the execution time of the ring-merging instruction and the execution time of the ring-merging action, and by compensating for the sum of the execution time of the ring-unmerging instruction and the execution time of the ring-unmerging action.

[0010] Optionally, a multi-dimensional fusion decision and control module for loop closing and disclosing is used to determine whether loop closing is successful based on switch position information, and to determine whether loop disclosing is successful based on current and / or switch position information; If both the loop merging and demerging operations are successful, then the loop merging and demerging operation is considered successful; otherwise: If the loop unblocking fails, a remedial procedure for re-unblocking or a procedure to unblock the state before the loop unblocking operation is performed.

[0011] Optionally, the multi-dimensional fusion decision and control module for loop unblocking is configured with a current unblocking setpoint, which is used to: determine whether the unblocking condition is met based on the current and the unblocking setpoint when the loop unblocking is determined to be unblocking; If the aforementioned unblocking conditions are met, proceed with the unblocking procedure; Otherwise, a remedial procedure will be initiated, and the loop unblocking operation will be re-executed.

[0012] Optionally, the multi-dimensional fusion decision and control module for the combined and disconnected loops determines whether the disconnection conditions are met based on the current and the disconnection setpoint, including: The obtained current is compared with the current delimitation setpoint. If the current is less than the current delimitation setpoint, the delimitation condition is not met, and the remedial procedure is entered to re-execute the loop delimitation operation. If the current is greater than the current disconnection setpoint, then the disconnection procedure is satisfied and the disconnection procedure is entered.

[0013] Optionally, the multi-dimensional fusion decision and control module for the combined solution loop is also used to enter the disengagement procedure after the remedy fails.

[0014] Optionally, the sensing and remote control module includes: The loop-closing and loop-breaking unit is communicatively connected to the loop-closing and loop-breaking multidimensional fusion decision and control module, the first incoming line switch module, the second incoming line switch module, and the bus tie switch module. It is used to collect and feed back the switch position information of the first incoming line switch module, the second incoming line switch module, and the bus tie switch module to the loop-closing and loop-breaking multidimensional fusion decision and control module, and to control the switch modules to perform loop-closing and loop-breaking operations according to the control instructions of the loop-closing and loop-breaking multidimensional fusion decision and control module. A current detection unit is used to detect the current of the first incoming line, the current of the second incoming line, the current of the first bus line, and the current of the second bus line. A voltage detection unit is used to detect the voltage of the first incoming line, the voltage of the second incoming line, the voltage of the first bus line, and the voltage of the second bus line. The voltage angle difference calculation unit is used to calculate the voltage angle difference based on the line voltage.

[0015] The present invention also provides a low-voltage flexible self-healing method, applied to the low-voltage flexible interconnect system described in any of the preceding claims, the method comprising: The sensing and remote control module collects multi-element power grid parameter information and switch position information of the line; the multi-element power grid parameter information includes the voltage, current and angle difference of the incoming line, and the voltage, current and angle difference of the bus line; the switch position information includes the closed position and the tripped position. The multi-dimensional fusion decision and control module of the combined and disassembled loop acquires the multi-element power grid parameter information and the switch position information in real time, and determines whether the combined and disassembled loop blocking conditions are met based on the multi-element power grid parameter information and the switch position information; If the conditions are met, the multi-dimensional fusion decision and control module for closing and disclosing loops sends control commands to the sensing and remote control module according to the closing and disclosing loop synchronization compensation mechanism to control the first incoming line switch module, the second incoming line switch module, or the bus tie switch module to perform closing and disclosing loop operations; the closing and disclosing loop synchronization compensation mechanism is a compensation mechanism that aligns the actual closing time of the switch with the actual disclosing time.

[0016] Compared with existing technologies, the above technical solution has the following advantages: 1. The low-voltage flexible interconnection system provided by this invention achieves synchronized operation of the merging and disassembling loops by integrating multi-dimensional information such as multi-dimensional power grid parameter information and switch position information, and by using a merging and disassembling loop synchronization compensation mechanism. This ensures that there is no circulating current during the merging and disassembling loop process, and that at least one incoming line is supplying power and there is no voltage loss at any time during the merging and disassembling loop operation.

[0017] 2. This invention avoids the large-amplitude transient impact current generated by the "circulating voltage source", eliminates the harmful effects of the severely affected attenuation characteristics of the impact current, and prevents the circuit protection from tripping during the "hot shutdown" process.

[0018] 3. This invention also establishes a multi-layered protection system for preventing misoperation, including remediation and current disconnection, forming a fully automated safety mechanism. It is a new type of fully automatic intelligent switching flexible self-healing system.

[0019] 4. Achieve one-click sequential control at the millisecond level, shortening the switching operation to within 25ms, and achieving a "zero-perception" power consumption experience for users with the help of a graphical interface and voice guidance operation. Attached Figure Description

[0020] Figure 1 A schematic diagram of a low-voltage flexible interconnection system according to an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a combination-disconnect loop control in a low-voltage flexible interconnect system according to an embodiment of the present invention; Figure 3 A timing diagram for delay compensation of a combined ring synchronization compensation mechanism according to an embodiment of the present invention; Figure 4A schematic diagram illustrating six controllable modes of a low-voltage flexible interconnection system according to an embodiment of the present invention; Figure 5 A schematic flowchart of a low-pressure flexible self-healing method according to an embodiment of the present invention; Figure label: 1-First incoming line switch module; 2-First incoming line; 3-First busbar line; 4-Second incoming line switch module; 5-Second incoming line; 6-Second busbar line; 7-Combined solution loop multidimensional fusion decision and control module; 8-Sensing and remote control module; 9-Bus tie switch module. Detailed Implementation

[0021] The advantages of the present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments.

[0022] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0023] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0024] In the description of this invention, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and 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, and therefore should not be construed as a limitation of this invention.

[0025] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0026] In the following description, suffixes such as "module," "part," or "unit" to indicate elements are used only for the convenience of the description of the invention and have no specific meaning in themselves. Therefore, "module" and "part" can be used interchangeably.

[0027] Figure 1 A low-voltage flexible interconnect system conforming to an embodiment of the present invention is shown. See also... Figure 1 The low-voltage flexible interconnection system includes: The device includes a first incoming line 2 connected to a first busbar 3, a second incoming line 5 connected to a second busbar 6; a first incoming line switch module 1 is provided on the first incoming line 2, a second incoming line switch module 4 is provided on the second incoming line 5, and a bus tie switch module 9 is provided between the first busbar 3 and the second busbar 6; the device further includes a sensing and remote control module 8, which is communicatively connected to the first incoming line switch module 1, the second incoming line switch module 4, and the bus tie switch module 9, and is used to collect the switch position information and multi-element power grid parameter information of the lines; the multi-element power grid parameter information includes the voltage, current, and angle difference of the incoming lines, and the voltage, current, and angle difference of the busbars; the switch position information... The information includes the closed position and the open position; the multi-dimensional fusion decision and control module 7 for closing and opening loops is configured with a closing and opening loop synchronization compensation mechanism; and it is communicatively connected to the sensing and remote sensing module; the closing and opening loop synchronization compensation mechanism is a compensation mechanism that aligns the actual closing time of the switch with the actual opening time of the switch; and it is used to: acquire the multi-element power grid parameter information and the switch position information in real time, and determine whether the closing and opening loop blocking conditions are met based on the multi-element power grid parameter information and the switch position information; if the conditions are met, it is also used to: send control commands to control the first incoming line switch module 1, the second incoming line switch module 4 or the bus tie switch module 9 to perform closing and opening loop operations based on the closing and opening loop synchronization compensation mechanism.

[0028] In this embodiment, the combined loop multidimensional fusion decision and control module 7 is a high-performance three-phase metering chip.

[0029] In the low-voltage flexible interconnection system provided by this invention, not only is the automating of loop closing and disclosing achieved, but also the multi-dimensional fusion decision and control module 7 monitors and utilizes multi-dimensional information such as multi-grid parameter information and switch position information to make decisions on loop closing and disclosing. A synchronous compensation mechanism for loop closing and disclosing is designed to ensure that the actual execution time of loop closing and disclosing is aligned during the loop closing and disclosing process, so that the system does not generate loop current during each loop closing and disclosing process, and at least one incoming line is supplying power and does not lose voltage at any time during the loop closing and disclosing operation.

[0030] In an optional implementation, the closing loop interlocking conditions include: switch position information, angle difference conditions, incoming line voltage conditions, bus voltage conditions, incoming line current conditions, and interlocking activation conditions. By fusing these multi-dimensional interlocking conditions to make decisions on the closing loop, precise automated control of the closing loop is achieved. Specific closing loop interlocking conditions will be described in detail below using Mode 3 as an example; these details will not be elaborated upon here.

[0031] Figure 2 A schematic diagram of a combination-disconnect loop control in a low-voltage flexible interconnect system according to an embodiment of the present invention is shown. (See also...) Figure 2 In one optional embodiment of the present invention, the first incoming line 2 in this system is powered by the main power supply, and the second incoming line 5 is powered by the backup power supply. In another optional embodiment, the second incoming line 5 is powered by the main power supply, and the first incoming line 2 is powered by the backup power supply. The above embodiments of the present invention can realize the mutual switching between the main power supply and the backup power supply.

[0032] In a further optional embodiment, the first incoming line switch module 1, the second incoming line switch module 4, and the bus tie switch module 9 are circuit breakers.

[0033] In an optional embodiment, the sensing and remote control module 8 includes: a loop-closing unit, communicatively connected to the loop-closing multi-dimensional fusion decision and control module 7, the first incoming line switch module 1, the second incoming line switch module 4, and the bus tie switch module 9, for collecting and feeding back the switch position information of the first incoming line switch module 1, the second incoming line switch module 4, and the bus tie switch module 9 to the loop-closing multi-dimensional fusion decision and control module 7, and controlling the switch modules to perform loop-closing and loop-breaking operations according to the control commands of the loop-closing multi-dimensional fusion decision and control module 7; in a specific example, the loop-closing unit is a loop-closing device. A box with a contact symbol represents a circuit breaker, which is grounded. A current detection unit is used to detect the current of the first incoming line 2, the current of the second incoming line 5, the current of the first bus line 3, and the current of the second bus line 6. In a specific example, the current detection unit includes a voltage transformer and a fuse, with the fuse grounded. In the current detection unit, a high-precision current transformer is configured for current monitoring, which can identify leakage current within a dynamic range. A voltage detection unit is used to detect the voltage of the first incoming line 2, the voltage of the second incoming line 5, the voltage of the first bus line 3, and the voltage of the second bus line 6. In a specific example, the voltage detection unit is a current transformer used to measure the three-phase current. A voltage angle difference calculation unit is used to calculate the voltage angle difference based on the line voltages. In a specific and preferred example, the voltage angle difference analysis of the voltage angle difference calculation unit is based on an improved zero-crossing detection algorithm; the connection relationships of each device can all use conventional methods. Any connection method of the dual-power supply system that can achieve the purpose of this invention is within the scope of protection of this invention, and this invention is not limited thereto.

[0034] This invention employs a high-performance three-phase metering chip to accurately acquire power grid parameters, synchronously measuring three-phase voltage / current signals through a high-frequency sampling rate. By real-time monitoring of parameters such as voltage angle difference and current, and using a multi-dimensional criterion fusion mechanism, it predicts overload or voltage instability risks and makes real-time decisions. When the loop-breaking and blocking conditions are detected, such as a voltage drop below the rated value or a phase angle difference exceeding the rated value, the low-voltage switch is triggered to open or close, initiating reactive power compensation or load transfer, thereby achieving effective control of the low-voltage switch.

[0035] In the low-voltage flexible interconnection system provided by this invention, the device circuit also performs signal grounding processing on the two incoming power supplies to obtain accurate voltage difference, with actual acquisition accuracy reaching level 0.5 or higher.

[0036] Figure 3 A timing diagram for delay compensation of a combined ring synchronization compensation mechanism conforming to an embodiment of the present invention is shown. See also... Figure 3Since the execution time of the loop closing instruction and the loop closing instruction differs for different switching modules, in order to align the final actual execution time, in a preferred embodiment, the loop closing and loop closing synchronization compensation mechanism includes: a synchronization mechanism that aligns the actual execution time of the loop closing instruction with the actual execution time of the loop closing instruction by performing delay compensation on the execution time of the loop closing instruction and the execution time of the loop closing instruction respectively.

[0037] This invention, through the configuration of a synchronized compensation mechanism for the closing and disclosing loops, ensures that the final operations of the closing and disclosing loops are executed synchronously. During the "hot switching" process of dual-power-supply lines, it effectively eliminates potential equivalent "circulating current voltage sources," avoids the large-amplitude transient impact current generated by these sources, eliminates the harmful effects of the severely affected attenuation characteristics of the closing current, prevents severe thermal and electrodynamic effects in the electrical circuit, avoids the impact of this closing current on power supply equipment such as transformers, and prevents circuit protection tripping during the "hot switching" process. This ensures the power supply quality for users during "hot switching," does not affect users' power supply needs during operation, controls the circulating current energy during operation, and ensures the safe and stable operation of primary equipment and the power grid.

[0038] To more precisely control the consistency of the actual execution time of the synergistic loop, Figure 3 A timeline diagram for a more preferred compensation mechanism, in Figure 3 In a more preferred embodiment of the present invention, the closing compensation time is further compensated for by a delay based on the mechanical characteristics of the switching modules. That is, considering the difference in the actual closing action time of each switching module after the control command is issued, a delay is made accordingly, thereby more accurately aligning the actual closing and disclosing action times and avoiding transient impact closing current. In this embodiment, as shown... Figure 3 The loop merging and unmerging synchronization compensation mechanism shown includes: a synchronization mechanism that aligns the actual execution time of loop merging with the actual execution time of loop merging and unmerging actions by separately compensating for the sum of the execution times of the loop merging instruction and the loop merging action. Specifically, the horizontal arrow portion shown in the figure represents the delay compensation time for loop merging and unmerging, ensuring that the final actual execution time of loop merging aligns with the actual execution time of loop merging.

[0039] In this further optimized implementation, the low-voltage flexible interconnection system adopts a compensation algorithm that matches the mechanical characteristics of the circuit breaker, eliminating the inconsistency in the final actual action execution time caused by the different execution times of different circuit breakers from the start of command execution to the actual action time of the circuit breaker. This achieves a more accurate and seamless switching process, ultimately enabling dual-power supply users to achieve a power supply effect with zero power outage perception and improving power supply reliability.

[0040] In a specific example of this invention, Table 1 specifies the corresponding delay compensation for each switch module during the switch-loop closing operation. In the delay time settings of a specific system shown in Table 1, the closing compensation time is set to 1~5ms, while the closing delay time is set to 0ms. This precisely aligns with the actual action execution time, ensuring that the closing and closing actions are performed simultaneously. Table 1 is merely an example of delay compensation for a specific device. Specific delay time settings for closing and closing delay compensation times are tested and configured on different devices before the system leaves the factory, and this invention does not impose limitations on these settings.

[0041] Table 1: Delay and Compensation Time for Switch Closing and Unclosing Loop Operations

[0042] Figure 4 The diagram illustrates six controllable modes of a low-voltage flexible interconnect system conforming to an embodiment of the present invention. The present invention can achieve, for example... Figure 4 The diagram shows six operating modes, from Mode 1 to Mode 6. In the following descriptions, T represents disconnection / jump, and H represents merging. For example, in Mode 1: 1T,2H,3H -->1H,2T,3H means: Initial state: #1 disconnected, #2 merged, #3 merged; after merging and unmerging the loop: (#1 merged, #2 disconnected, #3 merged). The meanings of other modes are similar and will not be elaborated further.

[0043] The six modes are as follows: Mode 1 & 2: Initial state is 1T, 2H, 3H (#1 open, #2 closed, #3 closed); Mode 1: 1T,2H,3H --> 1H,2T,3H; Mode 2: 1T,2H,3H --> 1H,2H,3T. Mode 3 & 4: Initial state is 1H, 2T, 3H (#1 closed, #2 open, #3 closed); Mode 3: (1H,2T,3H --> 1T,2H,3H); Mode 4: (1H,2T,3H --> 1H,2H,3T). Pattern 5 & 6: Initial state = 1H, 2H, 3T (#1 closed, #2 closed, #3 closed); Pattern 5: (1H, 2H, 3T --> 1T, 2H, 3H); Pattern 6: (1H, 2H, 3T --> 1T, 2H, 3H).

[0044] In this invention, the low-voltage flexible interconnection system uses a multi-dimensional fusion decision and control module to monitor switch position information, angle difference conditions, incoming line voltage conditions, bus voltage conditions, incoming line current conditions, and other multi-factor fusion lockout conditions in real time. In a dual-power supply system, when a fault is detected in one of the incoming lines causing a power outage, the intelligent switching will immediately initiate an automatic load transfer program and perform fusion lockout operation. This process monitors various parameters in real time and completes the load transfer of the non-faulty line within a specified time. The system, combined with a fusion lockout synchronous compensation mechanism, develops a flexible self-healing system with at least six intelligent switching modes to ensure uninterrupted power supply to critical loads, achieve seamless switching, and ultimately enable dual-power users to achieve a zero-power-outage perception power supply effect, thus improving power supply reliability.

[0045] The low-voltage flexible interconnection system provided by this invention, in addition to achieving high precision, rapid response, no circulating current, and applicability to multi-mode ring-to-ring operation, is also equipped with decision-making functions that can monitor, remedy, and disconnect the ring-to-ring operation process in order to automate the handling of ring-to-ring failure.

[0046] In a further embodiment of the present invention, the multi-dimensional fusion decision and control module for loop closing and disclosing is further configured to determine whether loop closing is successful based on switch position information, and to determine whether loop disclosing is successful based on current and / or switch position information. If both loop closing and disclosing operations are successful, the current loop closing and disclosing operation is considered successful; otherwise, if loop disclosing fails, a remedial procedure for re-disclosing or a reverting procedure to the state before the loop disclosing operation is performed; this achieves monitoring of the success of the loop closing and disclosing process and enables automated remedial or disclosing operations based on the monitoring results. Optionally, the multi-dimensional fusion decision and control module for loop closing and disclosing is configured with a current disclosing setpoint, used to: determine whether the disclosing condition is met based on the current and the disclosing setpoint when the loop disclosing is determined to have failed; if the disclosing condition is met, the disclosing procedure is entered; otherwise, a remedial procedure is entered to re-execute the loop disclosing operation. Further optionally, the multi-dimensional fusion decision and control module for loop unblocking determines whether the unblocking condition is met based on the current and the unblocking setpoint by: comparing the acquired current with the current unblocking setpoint; if the current is less than the current unblocking setpoint, the unblocking condition is not met, and a remedial procedure is entered to re-execute the loop unblocking operation; if the current is greater than the current unblocking setpoint, the unblocking procedure is determined to be met, and the unblocking procedure is entered.

[0047] In a further implementation, the multi-dimensional fusion decision and control module for the combined and disassembled rings is also used to enter the disassembly procedure after the remedy fails, restore the state of the combined and disassembled rings before the failure, and also prove that the combined and disassembled ring operation has failed and provide feedback to the user through the system's display device.

[0048] The low-voltage flexible interconnection system provided by this invention establishes a multi-layered protection system for preventing misoperation, including operation remediation and current splitting, based on the operation of the loop connection and disconnection, forming a fully adaptive safety mechanism.

[0049] exist Figure 2 Based on, combined Figure 4 In a specific example, taking Mode 3 as an example, the process of resolving the loop, as well as the procedures for remediation and separation, will be explained in detail.

[0050] (I) Solution loop procedure: In Mode 3, the position signal of switch #1 is in the closed state, and the position signal of switch #2 is in the open state. The device's action is as follows: close switch #2, and after confirming that switch #2 has successfully closed the loop, open switch #1, i.e., 1H,2T,3H --> 1T,2H,3H; during this process of closing and unclosing the loop, the line and busbar do not lose voltage or power, and no loop current is generated on the busbar.

[0051] Before the closing and opening loop operation, the device determines the interlocking operation conditions for current, voltage, and angle difference (selected in the control word of the setting). The switch position information, angle difference condition, incoming line voltage condition, bus voltage condition, incoming line current condition, and interlocking entry condition are as follows: 2. Angle difference condition: "Angle difference judgment" setting exit does not judge angle difference. Setting exit setting entry: Determine whether the angle difference value meets the range. If it meets the range, it is allowed; if it does not meet the range, the interlocking closing loop "minimum operating angle difference" ≤ voltage angle difference value on both sides of the breaker ≤ "maximum operating angle difference". 3. Incoming Line Voltage Conditions: "Incoming Line 1 Voltage Judgment" and "Incoming Line 2 Voltage Judgment" settings: When enabled / disabled, the incoming line voltage is not judged. When enabled / disabled, the incoming line voltage is judged to meet the voltage condition. If met, it is permissible; otherwise, the interlocking loop is closed. "Voltage Setting Value" ≤ Incoming Line 1 Voltage Value UX1; "Voltage Setting Value" ≤ Incoming Line 1 Voltage Value UX2. 4. Busbar Voltage Conditions: When enabled / disabled, the busbar voltage is not judged. When enabled / disabled, the busbar voltage is judged to meet the voltage condition. If met, it is permissible; otherwise, the interlocking loop is closed. "Voltage Setting Value" ≤ Busbar 1 Voltage Value UAB1 and Busbar 1 Voltage Value UCB1 (both must be met). "Voltage Setting Value" ≤ Busbar 2 Voltage Value UAB2 and Busbar 2 Voltage Value UCB2 (both must be met). 5. Incoming Line Current Conditions: When enabled / disabled, the incoming line current is not judged. Setting the activation / deactivation parameters: Determine if the current of each incoming line meets the current-free / current-free condition. If it does, it is allowed; otherwise, the lockout / unlocking loop is activated. "No Current Setting" ≥ Incoming Line 2 current value IA1, Incoming Line 2 current value IC1 (both must be met simultaneously). "Current-Free Setting" ≤ Incoming Line 1 current value IA2, Incoming Line 1 current value IC2 (both must be met simultaneously). 6. Input Conditions: "Lockout Transfer" = 0, "Mode 3" = 1, "Start" = 1.

[0052] The specific loop closing and opening operation process for Mode 3 is as follows: Operation is performed by operating the input knob; Device startup: When there is a loop closing and opening operation indicator, the device immediately activates the start relay, and the device starts after a delay of 500ms; The #2 switch loop closing operation is performed, and after 20ms, it is confirmed whether the #2 switch is successfully closed. If successful, the #1 switch loop opening operation is performed; After issuing the #1 switch loop opening operation command, the device checks whether the #1 switch is successfully opened. If there is current in the #1 switch before startup, it is determined that the current has changed to no current. If it is initially in a light load state, it is determined whether the position signal is open. If the conditions are met and the voltage is normal, the ΔT setting value is confirmed and the operation is determined to be successful after a delay; The #2 switch loop closing output (circuit breaker closing time (closing pulse width) DHT+5ms) is withdrawn, and the #1 switch loop opening output (circuit breaker opening time (opening pulse width) DFT+5ms) is withdrawn.

[0053] Successful resolution of the chain, recovery and unblocking procedures: Successful operation logic: The criteria for a successful loop closing operation on the loop-closing switch are: the position signal changes to "closed," confirmed for 20ms. If the loop closing switch closes successfully, the loop-opening switch is then opened. The criteria for a successful loop-opening operation on the loop-opening switch are: if the switch had current before startup, it changes from "current-free" to "current-free"; if the switch had no current before startup, the position signal changes to "open." The criteria for a successful loop closing / opening operation are: if the line current before operation is greater than the current setting, the loop closing switch has current and the loop opening switch has no current; if the line current before operation is less than the current setting (i.e., light load condition), the loop closing switch position signal is "closed" and the loop opening switch position signal is "open," the bus voltage is normal, and after a confirmation delay T, the loop closing / opening operation is considered successful.

[0054] Operation failure logic: If the device does not determine success, it enters the operation failure process. The following situations need to be distinguished: If the closing switch fails to close: The confirmation time is the maximum confirmation time setting TPx for the closing switch. The closing output operation of the closing switch is withdrawn, the device reports the operation failure and returns.

[0055] Loop-breaking switch failure: If current is detected in the loop-breaking switch or the position signal is closed, and the confirmation time is the maximum operating time Tpx setpoint of the loop-breaking switch, then the loop-breaking switch is considered to have failed to break the loop. If the current in any line is greater than the current tripping setpoint, the current tripping judgment is entered directly without any remedial action; if the line current is less than the current tripping setpoint, the remedial action state is entered. The device immediately withdraws the loop-breaking output command sent to the loop-breaking switch, and after a waiting time of 100ms, sends the loop-breaking output command to the loop-breaking switch again to perform remedial actions. The device illuminates the operation failure indicator light.

[0056] If the loop-breaking remedial measures fail: the current does not meet the current tripping setting, and the device continues to operate until manually reset. The device's current tripping judgment is based on: the current in any line exceeds the overcurrent tripping current setting, and the confirmation time is the overcurrent tripping time setting. If the current tripping judgment is successful, the device performs the operation to restore the original circuit breaker state, the confirmation time is the set value T, and the device returns.

[0057] Current disconnection logic: The judgment criteria are as follows: When the current of switch #1 or switch #2 exceeds the current Ig setpoint and remains above the current Tg setpoint for a duration of 100ms, the device restores the original circuit breaker state and retracts the output within 100ms; if there is no current overflow, the device remains in a waiting state until any switch or bridge switch is manually disconnected to break the circulating current state, at which point the device can return by manually pressing the reset button on the device; or the device will automatically return after waiting for 15 seconds; after implementing remedial measures, the device detects the execution result of the remedial measures and detects the closed loop switch position signal as open. If the position signal of the loop-opening switch is in the closed position, and after a time delay of a set value T, the remedial measure is considered successful, and the device returns. If a voltage drop is detected after the remedial measure is implemented, the remedial measure failure indicator light will illuminate, and the device will return. The loop-opening / loop-closing output command sent to the loop-opening / loop-closing switch will be withdrawn after 100ms. If a loop-opening / loop-closing operation fails and a non-current-overcurrent-overcurrent-waiting state is formed, and a system short-circuit fault occurs, the device's current-disconnection function can act before the system protection. After the switch is disconnected, the impact of the system fault can be effectively reduced.

[0058] As can be seen from the automated backup and automatic transfer process described above in Mode 3, the low-voltage flexible interconnection system provided by this invention is a fully automatic, novel, intelligent, flexible, and self-healing system. Through a multi-dimensional fusion decision and control module for the closing and disclosing loop, it monitors switch position information, angle difference conditions, and other multi-factor criteria in real time. Combined with a closing and disclosing loop synchronous compensation mechanism, the system achieves a power supply effect with no circulating current during the closing and disclosing loop process and zero power outage perception for users, thus improving power supply reliability. It also includes a closing and disclosing loop monitoring program, capable of monitoring, remediating, and decision-making regarding the closing and disclosing loop operation process.

[0059] Figure 5 A flowchart illustrating a low-voltage flexible self-healing method according to an embodiment of the present invention is shown. This low-voltage flexible self-healing method is applied to the aforementioned low-voltage flexible interconnect system. The method includes steps S1 to S3: S1: The sensing and remote control module collects multi-element power grid parameter information and switch position information of the line; the multi-element power grid parameter information includes the voltage, current and angle difference of the incoming line, and the voltage, current and angle difference of the bus line; the switch position information includes the closed position and the tripped position.

[0060] S2: The multi-dimensional fusion decision and control module of the combined and disconnected loop acquires the multi-element power grid parameter information and the switch position information in real time, and determines whether the combined and disconnected loop blocking conditions are met based on the multi-element power grid parameter information and the switch position information.

[0061] S3: If the conditions are met, the multi-dimensional fusion decision and control module for closing and disclosing loops sends control commands to the sensing and remote control module according to the closing and disclosing loop synchronization compensation mechanism to control the first incoming line switch module, the second incoming line switch module, or the bus tie switch module to perform closing and disclosing loop operations; the closing and disclosing loop synchronization compensation mechanism is a compensation mechanism that aligns the actual closing time of the switch with the actual disclosing time.

[0062] In the low-voltage flexible self-healing method provided by this invention, the decision to merge and dissolve the loop is made by monitoring and using multi-dimensional information such as multi-grid parameter information and switch position information through the multi-dimensional fusion decision and control module. The actual execution time of the loop and the dissolution loop is aligned by the synchronization compensation mechanism of the loop and the dissolution loop, so that the system does not generate loop current during each loop merging and dissolution process, and at least one incoming line is supplying power and does not lose voltage at any time during the loop merging and dissolution operation.

[0063] Furthermore, this invention also features an independent display window, enabling visualization of functions, operations, and results. Through a graphical design, voice prompts are provided throughout the entire operation process, providing staff with an efficient and convenient user experience. This invention innovatively develops millisecond-level one-click sequential control technology, reducing switching operations to less than 25ms, and combined with a graphical interface and voice-guided operation, achieving a "zero-perception" electricity experience for users.

[0064] In a specific feasible example, the visualization panel includes indicator lights for operation, communication, synchronization, abnormality, action, success, failure, and recovery; Operation: Device operation indicator light. It flashes when operating normally and remains on or off when stopped or malfunctioning; Communication: Device communication indicator light with the host computer. It flashes when communication is normal and remains on or off when communication is stopped or malfunctioning; Synchronization: Synchronization communication indicator light for the left and right distributed devices in the primary topology of the intermediate switch device. It remains on when communication is normal and turns off when communication is stopped or malfunctioning; Abnormality: When a board malfunction occurs in the device, the device abnormality indicator light illuminates and the device is locked; Action: Device action indicator light. Normally off; when an output trip occurs, the indicator light stays on. After manual (remote or local) reset, the light goes off. Success: Normally off; the device executes the loop-break mode. If the operation is successful, the indicator light stays on. After manual (remote or local) reset, the light goes off. Failure: Normally off; the device executes the loop-break mode. If the operation is unsuccessful, the indicator light stays on. After manual (remote or local) reset, the light goes off. Remediation: Normally off; the device executes the loop-break mode. If the operation is unsuccessful, the indicator light stays on after entering the remediation logic. After manual (remote or local) reset, the light goes off.

[0065] In summary, this invention employs a three-phase metering chip to collect data on the low-voltage side voltage and current of the transformer in the distribution room, the bus voltage, and remote signaling of each low-voltage switch. It then monitors and utilizes multi-dimensional information, including various grid parameters and switch position information, to make decisions on loop closing and closing, achieving precise control of the low-voltage switches. Combined with a loop closing and closing synchronization compensation mechanism, the actual execution time of loop closing and closing is consistent during the loop closing and closing process, ensuring that at least one incoming line is supplying power at any given time during loop closing and closing operations, preventing voltage loss. Furthermore, this system does not generate loop current during loop closing and closing, thus avoiding severe thermal and electrodynamic effects in the electrical circuits and preventing circuit protection tripping during "hot switching." Ultimately, it enables dual-power supply users to achieve zero-outage perception, improving power supply reliability. This invention solves the problems of power outages caused by traditional manual operations, the electrical damage caused by long loop closing times during manual hot switching, and eliminates the deficiency of lacking automatic transfer switching functionality.

[0066] Furthermore, a multi-layered protection system for preventing misoperation, including remediation and current disconnection, has been established, forming a fully automated safety mechanism. This eliminates the shortcomings of traditional solutions, such as the lack of dynamic early warning and adaptive recovery capabilities for complex operations, the inability to safely perform uninterrupted switching operations, reliance on manual recovery after a fault, slow response speed, inability to achieve millisecond-level fault isolation and automatic power switching, and difficulty in meeting the requirements of modern power distribution networks for resilience and self-healing.

[0067] In the more convenient solution, an innovative millisecond-level one-click sequential control technology has been developed, which shortens the switching operation to less than 25ms. Combined with a graphical interface and voice guidance operation, it realizes a "zero-perception" experience for users of electricity.

[0068] As can be seen, this invention is a novel, fully automated, intelligent, flexible self-healing system that is fast, safe, user-unobtrusive, and has a self-activation function. It is a groundbreaking innovative solution in this field.

[0069] It should be noted that the embodiments of the present invention have better implementability and are not intended to limit the present invention in any way. Any person skilled in the art may use the above-disclosed technical content to change or modify it into equivalent effective embodiments. However, any modifications or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A low-voltage flexible interconnection system, characterized in that, include: A first incoming line is connected to a first busbar, and a second incoming line is connected to a second busbar; a first incoming line switch module is provided on the first incoming line, a second incoming line switch module is provided on the second incoming line, and a bus tie switch module is also provided between the first busbar and the second busbar; the device further includes: The sensing and remote control module is communicatively connected to the first incoming line switch module, the second incoming line switch module, and the bus tie switch module, and is used to collect the switch position information and multi-element power grid parameter information of the line; the multi-element power grid parameter information includes the voltage, current, and angle difference of the incoming line, and the voltage, current, and angle difference of the bus line; the switch position information includes the closed position and the tripped position. The multi-dimensional fusion decision and control module for combining and dissolving loops is configured with a synchronization compensation mechanism for combining and dissolving loops; and it is communicatively connected to the sensing and remote sensing module; the synchronization compensation mechanism for combining and dissolving loops represents a compensation mechanism that aligns the actual execution time of loop closing with the actual execution time of loop dissolving; and is used for: The system acquires the multi-element power grid parameter information and the switch position information in real time, and determines whether the combined / disjoint loop blocking condition is met based on the multi-element power grid parameter information and the switch position information; if the condition is met, it is further used for: Based on the aforementioned loop-to-loop synchronization compensation mechanism, control commands are sent to control the first incoming line switch module, the second incoming line switch module, or the bus tie switch module to perform loop-to-loop operation.

2. The low-voltage flexible interconnection system as described in claim 1, characterized in that, The combined and unlinked interlocking conditions include: switch position information, angle difference conditions, incoming line voltage conditions, bus voltage conditions, incoming line current conditions, and interlocking activation conditions.

3. The low-voltage flexible interconnection system as described in claim 1, characterized in that, The ring-merging and ring-dissolving synchronization compensation mechanism includes a synchronization mechanism that aligns the actual execution time of the ring-merging instruction with the actual execution time of the ring-dissolving instruction by performing delay compensation on the execution time of the ring-merging instruction and the ring-dissolving instruction respectively.

4. The low-voltage flexible interconnection system as described in claim 1 or 3, characterized in that, The ring-merging and ring-unmerging synchronization compensation mechanism includes: a synchronization mechanism that compensates for the delay of the sum of the ring-merging instruction execution time and the ring-merging action execution time, and compensates for the delay of the sum of the ring-unmerging instruction execution time and the ring-unmerging action execution time, so that the actual execution time of the ring-merging and the actual execution time of the ring-unmerging are aligned.

5. The low-voltage flexible interconnection system as described in claim 1, characterized in that, The multi-dimensional fusion decision and control module for loop closing and disclosing is used to determine whether loop closing is successful based on switch position information, and to determine whether loop disclosing is successful based on current and / or switch position information; If both the loop merging and unmerging operations are successful, then the loop merging and unmerging operation is considered successful. otherwise: If the loop unblocking operation fails, a remedial procedure for re-unblocking or a procedure to unblock the state before the loop unblocking operation is performed.

6. The low-voltage flexible interconnection system as described in claim 5, characterized in that, The multi-dimensional fusion decision and control module for loop unblocking stores current unblocking setpoints, which are used to: determine whether the unblocking conditions are met based on the current and the unblocking setpoints when the loop unblocking is determined to fail. If the aforementioned unblocking conditions are met, proceed with the unblocking procedure; Otherwise, a remedial procedure will be initiated, and the loop unblocking operation will be re-executed.

7. The low-voltage flexible interconnection system as described in claim 6, characterized in that, The multi-dimensional fusion decision and control module for loop unblocking is used to compare the acquired current with the current unblocking setpoint. If the current is less than the current unblocking setpoint, it is determined that the unblocking condition is not met, and a remedial procedure is entered to re-execute the loop unblocking operation. If the current is greater than the current unblocking setpoint, it is determined that the unblocking procedure is met, and the unblocking procedure is entered.

8. The low-voltage flexible interconnection system as described in claim 6, characterized in that, The multi-dimensional fusion decision and control module for the combined and disassembled loop is also used to enter the disassembled procedure after the remedy fails.

9. The low-voltage flexible interconnection system as described in claim 1, characterized in that, The sensing and remote control module includes: The loop-closing and loop-breaking unit is communicatively connected to the loop-closing and loop-breaking multidimensional fusion decision and control module, the first incoming line switch module, the second incoming line switch module, and the bus tie switch module. It is used to collect and feed back the switch position information of the first incoming line switch module, the second incoming line switch module, and the bus tie switch module to the loop-closing and loop-breaking multidimensional fusion decision and control module, and to control the switch modules to perform loop-closing and loop-breaking operations according to the control instructions of the loop-closing and loop-breaking multidimensional fusion decision and control module. A current detection unit is used to detect the current of the first incoming line, the current of the second incoming line, the current of the first bus line, and the current of the second bus line. A voltage detection unit is used to detect the voltage of the first incoming line, the voltage of the second incoming line, the voltage of the first bus line, and the voltage of the second bus line. The voltage angle difference calculation unit is used to calculate the voltage angle difference based on the line voltage.

10. A low-pressure flexible self-healing method, characterized in that, Applied to the low-voltage flexible interconnect system according to any one of claims 1-9, the method comprises: The sensing and remote control module collects multi-element power grid parameter information and switch position information of the line; the multi-element power grid parameter information includes the voltage, current and angle difference of the incoming line, and the voltage, current and angle difference of the bus line; the switch position information includes the closed position and the tripped position. The multi-dimensional fusion decision and control module of the combined and disassembled loop acquires the multi-element power grid parameter information and the switch position information in real time, and determines whether the combined and disassembled loop blocking conditions are met based on the multi-element power grid parameter information and the switch position information; If the conditions are met, the multi-dimensional fusion decision and control module for closing and disclosing loops sends control commands to the sensing and remote control module according to the closing and disclosing loop synchronization compensation mechanism to control the first incoming line switch module, the second incoming line switch module, or the bus tie switch module to perform closing and disclosing loop operations; the closing and disclosing loop synchronization compensation mechanism is a compensation mechanism that aligns the actual closing time of the switch with the actual disclosing time.

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