An online dynamic phase sequence distribution control method for a spliced multi-metering box

Abstract

The present application relates to the technical field of control method, disclose a kind of online dynamic phase sequence distribution control method of spliced multi-table position metering box, the method comprises: the three-phase incoming line current of each splicing module in spliced multi-table position metering box is collected, and the cascade topological relationship between each splicing module is obtained;According to the cascade topological relationship, along the electrical communication direction of the busbar connection terminal, the splicing module with consistent and continuous phase sequence conduction direction is classified as the same phase sequence conduction chain segment, to obtain the busbar connection point sequence in chain segment;The phase difference distribution of the three-phase incoming line current on the two sides of each busbar connection point in the busbar connection point sequence in chain segment is counted, and the phase sequence rotation direction of each phase sequence conduction chain segment is determined according to the phase difference distribution, the present application can solve the problem that traditional method only pays attention to the correctness of phase sequence of total end, cannot perceive the phase sequence deviation state at each cascade connection point.

Description

Technical Field

[0001] This invention relates to the field of control method technology, and in particular to an online dynamic phase sequence allocation control method for a spliced ​​multi-position metering box. Background Technology

[0002] Modular multi-position metering boxes, with their modular design, flexible expansion, and ease of on-site maintenance, have been widely used in centralized meter reading and energy metering in low-voltage distribution networks. These boxes achieve electrical cascading between modules via busbar connection terminals. The correctness of the three-phase incoming phase sequence directly affects the accuracy of energy metering and the reliability of power supply. Currently, phase sequence management for metering boxes mainly relies on manual phase checking and adjustment during the installation and commissioning phases; that is, when a phase sequence error is found, it is corrected by manually swapping the wiring positions. While a few metering boxes with automatic phase-switching functions can achieve phase switching, their control logic is mostly designed for a single meter position or independent load branch, lacking a systematic consideration of the cascading conduction characteristics of the busbars in the modular structure.

[0003] However, existing phase sequence control methods have significant drawbacks when dealing with the complex topology of multi-position metering boxes. First, the busbar connection terminals inside the multi-position metering box form a multi-cascade topology along the electrical connection direction. Phase sequence errors will accumulate and amplify step by step during the cascading transmission process. Traditional methods only focus on the phase sequence correctness of the incoming line terminal and cannot detect the phase sequence deviation at the connection points of each cascade.

[0004] Secondly, the loads of each splicing module have dynamic time-varying characteristics. The imbalance of the three-phase incoming current changes in real time with the user's electricity consumption behavior. However, the existing manual adjustment or preset automatic phase switching strategies lack dynamic closed-loop regulation capabilities based on real-time current feedback.

[0005] More importantly, when the phase sequence adjustment of a certain cascade node fails to achieve the expected results, the traditional method lacks a directional correction mechanism for subsequent cascade nodes, resulting in low adjustment efficiency or even causing new phase sequence disorder.

[0006] Therefore, there is an urgent need for a control method that can sense the three-phase current distribution of each node in real time and dynamically allocate the phase sequence based on the cascaded topology of splicing modules, so as to solve the phase sequence balance problem of spliced ​​multi-position metering boxes. Summary of the Invention

[0007] This invention provides an online dynamic phase sequence allocation control method for a spliced ​​multi-position metering box, the main purpose of which is to address the problems mentioned in the background art above.

[0008] To achieve the above objectives, the present invention provides an online dynamic phase sequence allocation control method for a modular multi-position metering box, comprising: S1. Collect the three-phase incoming current of each splicing module in the splicing multi-position metering box, and obtain the cascade topology relationship of the busbar connection terminals between each splicing module; S2. According to the cascade topology, along the electrical connection direction of the busbar connection terminals, the splicing modules with the same and continuous phase sequence conduction direction are divided into the same phase sequence conduction chain segment to obtain the busbar connection point sequence within the chain segment; S3. Statistically analyze the phase difference distribution of the three-phase incoming current on both sides of each busbar connection point in the busbar connection point sequence within the chain segment, determine the phase sequence switching direction of each phase sequence conduction chain segment based on the phase difference distribution, and generate the phase sequence adjustment sequence of each phase sequence conduction chain segment based on the phase sequence switching direction. S4. According to the phase sequence adjustment sequence, perform phase sequence rotation on the busbar connection points in each phase sequence conduction chain segment in sequence, and after each rotation, check whether the three-phase incoming current on both sides of the corresponding busbar connection point has been restored to three-phase symmetry. S5. When it is detected that the three-phase incoming current of the splicing modules on both sides of the busbar connection point has not been restored to three-phase symmetry, locate the cascade position of the splicing module that has not been restored to three-phase symmetry in the phase sequence conduction chain segment, and reverse the phase sequence rotation direction of each busbar connection point after the busbar connection point in the phase sequence adjustment sequence according to the cascade position. S6. When the three-phase incoming current of the splicing modules on both sides of each busbar connection point in all phase sequence conduction chain segments is restored to three-phase symmetry, the phase sequence status of each busbar connection point is locked, and an online dynamic phase sequence allocation control command is generated.

[0009] Preferably, the step of collecting the three-phase incoming current of each splicing module in the spliced ​​multi-position metering box and obtaining the cascade topology relationship of the busbar connection terminals between each splicing module includes: The power frequency electromagnetic induction of the three-phase incoming circuit corresponding to each splicing module in the spliced ​​multi-position metering box is collected to obtain the three-phase incoming current of the splicing module. Low-voltage DC conduction excitation detection is performed on the busbar connection terminals between each of the splicing modules to obtain the conduction state of each of the busbar connection terminals and the splicing module number on both sides corresponding to the conduction state; Based on the conduction state and the splicing module numbers on both sides, the cascading order of the busbar connection terminals is arranged in the direction of electrical connection to obtain a cascading topology.

[0010] Preferably, the step of grouping the splicing modules with consistent and continuous phase sequence conduction directions along the electrical connection direction of the busbar connection terminals into the same phase sequence conduction chain segment to obtain the busbar connection point sequence within the chain segment includes: Determine the electrical connection direction corresponding to the busbar connection terminals in the cascaded topology; The three-phase wiring arrangement of each busbar connection terminal is sequentially detected along the electrical connection direction to obtain the phase sequence conduction direction indicator; Based on the phase sequence conduction direction identifier and the cascade topology, the phase sequence conduction direction consistency of adjacent splicing modules is compared to obtain the splicing module grouping result; The chain segment boundaries of the grouping results of the splicing module are delineated to obtain the phase sequence transmission chain segments; Based on the cascaded topology, the busbar connection terminals within the phase sequence conduction chain segment are electrically connected and sorted to obtain the busbar connection point sequence within the chain segment.

[0011] Preferably, the step of statistically analyzing the phase-to-phase difference distribution of the three-phase incoming currents on both sides of each busbar connection point in the busbar connection point sequence within the chain segment includes: Extract the phase-to-phase angle of the three-phase incoming current on both sides of the busbar connection point in the busbar connection point sequence within the chain segment to obtain the phase-to-phase offset. Based on the phase offset, the phase compensation difference of the three-phase incoming current on both sides of the busbar connection point is calculated to obtain the phase compensation phase current deviation. Combining the phase compensation phase-to-phase current deviation and the arrangement order of the busbar connection point sequence within the chain segment, the cumulative deviation of the busbar connection points along the cascade direction is statistically analyzed to obtain the cascade cumulative phase-to-phase deviation. Based on the cascaded cumulative phase-to-phase deviation and the phase-to-phase offset, the phase sequence conduction chain segments are subjected to difference interval merging statistics to obtain the phase-to-phase difference distribution of the phase sequence conduction chain segments.

[0012] Preferably, the step of generating the phase sequence adjustment sequence for each of the phase sequence conduction chain segments in the phase sequence rotation direction includes: The phase sequence rotation direction and the sequence of busbar connection points within the chain segment are mapped point by point to obtain the target phase sequence arrangement of the busbar connection points; Based on the sequence of mother row connection points within the chain segment, the execution order of each mother row connection point is arranged in a cascade order to obtain the cascade execution order of each mother row connection point. Combining the cascaded execution order and the target phase sequence arrangement, the phase sequence rotation operation of the busbar connection point is encapsulated to obtain the phase sequence rotation operation instruction of the busbar connection point; Based on the phase sequence rotation operation command, the adjustment command sequence of each phase sequence conduction chain segment is arranged to obtain the phase sequence adjustment sequence of each phase sequence conduction chain segment.

[0013] Preferably, the step of sequentially performing phase sequence rotation on the busbar connection points within each phase sequence conduction chain segment according to the phase sequence adjustment sequence, and detecting whether the three-phase incoming currents on both sides of the corresponding busbar connection point have recovered three-phase symmetry after each rotation, includes: According to the phase sequence adjustment sequence, the busbar connection points in each phase sequence transmission chain segment are rotated to obtain the phase sequence state after rotation; The three-phase incoming current after the phase sequence state after the rotation is re-acquired to obtain the rotation three-phase incoming current; Based on the alternating three-phase incoming current, determine whether the three-phase symmetry is restored on both sides of the busbar connection point.

[0014] Preferably, when it is detected that the three-phase incoming current of the splicing modules on both sides of the busbar connection point has not recovered three-phase symmetry, locating the cascaded position of the splicing module that has not recovered three-phase symmetry in the phase sequence conduction chain segment includes: Based on whether the three-phase symmetry is restored, the busbar connection points that have not been restored are filtered out to obtain the busbar connection points that have not been restored. Based on the busbar connection point sequence within the chain segment, the splicing modules on both sides of the unrecovered busbar connection point are identified to obtain the unrecovered splicing module; By using the cascade topology, the cascade sequence number of the unrestored splicing modules is located to obtain the cascade position.

[0015] Preferably, the step of reversing the phase sequence rotation direction of each busbar connection point after the cascaded position in the phase sequence adjustment sequence includes: Based on the cascaded position, the set of busbar connection points to be corrected in the phase sequence adjustment sequence is extracted, and the current phase sequence rotation direction of the set of busbar connection points to be corrected is extracted. The current phase sequence rotation direction is reversed and corrected to obtain the corrected phase sequence rotation direction; In conjunction with the corrected phase sequence rotation direction, the phase sequence adjustment sequence is updated by covering the phase sequence rotation direction to obtain the corrected phase sequence rotation direction.

[0016] Preferably, the step of locking the current phase sequence status of each of the busbar connection points and generating an online dynamic phase sequence allocation control command includes: Read the current phase sequence state of each busbar connection point within the phase sequence conduction chain segment, and write-protect lock the current phase sequence state to obtain the locked phase sequence state; Based on the locked phase sequence state and the cascaded topology, the phase sequence allocation instruction is encoded for the busbar connection point to obtain the phase sequence allocation control code; The phase sequence allocation control code is encapsulated and sent to the phase sequence transmission chain segment to obtain online dynamic phase sequence allocation control instructions.

[0017] Preferably, the step of obtaining the online dynamic phase sequence allocation control command further includes: Extract a preset standard instruction library, and remove abnormal instructions from the online dynamic phase sequence allocation control instructions according to the standard instruction library.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention achieves comprehensive perception of the complex electrical structure inside the metering box by collecting the three-phase incoming current of each splicing module and obtaining the cascaded topology of the busbar connection terminals. By grouping splicing modules with consistent phase sequence conduction directions along the electrical connection direction into the same phase sequence conduction chain segment and constructing the busbar connection point sequence within the chain segment, the global phase sequence optimization problem is decomposed into the orderly control of several local chain segments. This avoids the oscillation risk caused by blindly and uniformly adjusting the entire metering box. By determining the phase sequence rotation direction based on the phase difference distribution of the three-phase incoming current on both sides of each busbar connection point, the adjustment strategy is directly derived from real-time imbalance data rather than relying on empirical presets, thereby improving the pertinence and effectiveness of phase sequence allocation.

[0019] This invention establishes a control link of rotation, detection, correction, and locking. After performing phase sequence rotation, it detects in real time whether the current on both sides of the busbar connection point has recovered three-phase symmetry. If it has not recovered, it accurately locates the cascade position of the substandard splicing module in the chain segment and corrects the rotation direction of all subsequent busbar connection points based on this. It also significantly improves the adjustment success rate under complex load conditions through adaptive reverse error correction. When all nodes in all chain segments have recovered three-phase symmetry, it locks the phase sequence state and generates online dynamic allocation control commands. At the same time, it eliminates abnormal commands through a standard command library, ensuring the safety and reliability of the control output. It realizes full-process automation from topology perception, chain segment division, difference-guided rotation, real-time closed-loop feedback to intelligent correction and locking. It solves the problems of phase sequence error accumulation and dynamic load imbalance in spliced ​​metering boxes during cascade transmission, and provides an efficient and robust intelligent phase sequence management method for modular metering equipment in low-voltage distribution networks. Attached Figure Description

[0020] Figure 1 This is a flowchart illustrating an online dynamic phase sequence allocation control method for a spliced ​​multi-position metering box according to an embodiment of the present invention. The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] This application provides an online dynamic phase sequence allocation control method for a modular multi-position metering box. The executing entity of this method includes, but is not limited to, at least one of the following electronic devices that can be configured to execute the method provided in this application: a server, a terminal, etc. In other words, the online dynamic phase sequence allocation control method for the modular multi-position metering box can be executed by software or hardware installed on a terminal device or a server device. The server includes, but is not limited to, a single server, a server cluster, a cloud server, or a cloud server cluster. The server can be an independent server or a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery networks, and big data and artificial intelligence platforms.

[0023] Reference Figure 1 The diagram shown is a flowchart illustrating an online dynamic phase sequence allocation control method for a modular multi-position metering box according to an embodiment of the present invention. In this embodiment, the online dynamic phase sequence allocation control method for the modular multi-position metering box includes: S1. Collect the three-phase incoming current of each splicing module in the splicing multi-position metering box, and obtain the cascade topology relationship of the busbar connection terminals between each splicing module; In this embodiment, the acquisition of the three-phase incoming current of each splicing module in the spliced ​​multi-position metering box, and the acquisition of the cascade topology relationship of the busbar connection terminals between each splicing module, includes: The power frequency electromagnetic induction of the three-phase incoming circuit corresponding to each splicing module in the spliced ​​multi-position metering box is collected to obtain the three-phase incoming current of the splicing module. Low-voltage DC conduction excitation detection is performed on the busbar connection terminals between each of the splicing modules to obtain the conduction state of each of the busbar connection terminals and the splicing module number on both sides corresponding to the conduction state; Based on the conduction state and the splicing module numbers on both sides, the cascading order of the busbar connection terminals is arranged in the direction of electrical connection to obtain a cascading topology.

[0024] Specifically, the modular multi-position metering box is a modular energy metering device used in low-voltage power distribution networks. It is composed of multiple independent splicing modules combined through internal electrical connections and is used to centrally install electricity meters and distribute electrical energy.

[0025] The splicing module is the basic functional unit that constitutes the splicing multi-position metering box. Each module contains an independent three-phase incoming circuit and a corresponding power metering component, and can be connected to the load individually.

[0026] The three-phase incoming current refers to the real-time current signal flowing through the three-phase power input circuit (phase A, phase B, and phase C) of the splicing module, which is the core physical quantity that needs to be collected in this step.

[0027] Three-phase incoming circuit: The electrical circuit channel inside the splicing module used to introduce external three-phase power, including A, B, and C three-phase conductors and corresponding connection terminals.

[0028] Specifically, power frequency electromagnetic induction refers to the use of an alternating magnetic field generated by an industrial frequency alternating current to induce a secondary signal in a detection coil that is proportional to the primary current through the principle of electromagnetic induction, which is used for non-contact current measurement.

[0029] Busbar connection terminals are metal conductive connection components used to achieve electrical cascading between splicing modules. They are located on the splicing side of the modules and serve as the physical interface for transmitting three-phase power from the upper-level module to the lower-level module.

[0030] Low-voltage DC conduction excitation detection is an electrical connection status detection method. It determines whether the connection terminal is in an electrical conduction state by applying a DC voltage signal lower than the safe voltage across the two ends of the busbar connection terminal and detecting whether current flows through the circuit.

[0031] The continuity status refers to the electrical connectivity result exhibited by the busbar connection terminals under low-voltage DC continuity excitation detection, i.e., whether it is conducting or not conducting, and is used to identify whether there is an actual electrical connection between two splicing modules.

[0032] Specifically, the splicing module number is a unique identifier assigned to each splicing module in the splicing multi-position metering box, used to distinguish and locate different modules in the system.

[0033] Electrical connection direction refers to the actual conduction direction of three-phase power supply between busbar connection terminals, that is, from the busbar connection terminals of the upper-level splicing module to the busbar connection terminals of the lower-level splicing module.

[0034] The cascading order is the result of arranging each splicing module sequentially along the power conduction path based on the conduction status and electrical connection direction of the busbar connection terminals.

[0035] The cascaded topology reflects the complete mapping relationship of the electrical connection structure and power conduction path formed between all splicing modules inside the spliced ​​multi-position metering box through busbar connection terminals.

[0036] In detail, the corresponding induced signal is obtained in each phase input circuit using the principle of power frequency electromagnetic induction. After conditioning and conversion, the signal is output as a usable three-phase input current value. Continuity detection is performed on the busbar connection terminals between the splicing modules. A low-voltage DC conduction excitation method is used, applying a low-voltage DC signal to both ends of each busbar connection terminal. The actual conduction state of each busbar connection terminal is determined by detecting whether the signal circuit forms a complete electrical path. During the detection process, the splicing module numbers on both sides corresponding to the conduction state are recorded simultaneously.

[0037] Then, the actual connection relationship between the splicing modules is determined based on whether the connection terminals of each busbar are conductive. The electrical connection direction is then determined by combining the relative positions of the power input side and the load side. Based on this direction, each splicing module is arranged sequentially from the power input end to the end load, thereby constructing a cascade topology relationship of the electrical connection path between each splicing module inside the metering box.

[0038] S2. According to the cascade topology, along the electrical connection direction of the busbar connection terminals, the splicing modules with the same and continuous phase sequence conduction direction are divided into the same phase sequence conduction chain segment to obtain the busbar connection point sequence within the chain segment; In this embodiment, the step of grouping the splicing modules with consistent and continuous phase sequence conduction directions along the electrical connection direction of the busbar connection terminals into the same phase sequence conduction chain segment to obtain the busbar connection point sequence within the chain segment includes: Determine the electrical connection direction corresponding to the busbar connection terminals in the cascaded topology; The three-phase wiring arrangement of each busbar connection terminal is sequentially detected along the electrical connection direction to obtain the phase sequence conduction direction indicator; Based on the phase sequence conduction direction identifier and the cascade topology, the phase sequence conduction direction consistency of adjacent splicing modules is compared to obtain the splicing module grouping result; The chain segment boundaries of the grouping results of the splicing module are delineated to obtain the phase sequence transmission chain segments; Based on the cascaded topology, the busbar connection terminals within the phase sequence conduction chain segment are electrically connected and sorted to obtain the busbar connection point sequence within the chain segment.

[0039] Specifically, the electrical connection direction refers to the actual conduction direction of the three-phase power supply between the busbar connection terminals, that is, the direction from the busbar connection terminals of the upper-level splicing module to the busbar connection terminals of the lower-level splicing module. This direction points from the power supply input side to the load side and is determined by the relative position of the splicing module numbers on both sides of the busbar connection terminals in the cascaded topology.

[0040] The three-phase wiring sequence refers to the actual arrangement order of the three phase lines (A-phase, B-phase, and C-phase) at the busbar connection terminals in physical space.

[0041] The phase sequence conduction direction indicator is used to mark the phase sequence arrangement characteristics of the busbar connection terminals in the power conduction direction. Specifically, it is a specific rule in which the three-phase wiring arrangement at the connection terminal follows the electrical connection direction, such as forward or reverse sequence.

[0042] Specifically, the grouping results of splicing modules are based on the consistency comparison of the phase sequence conduction direction markings of adjacent splicing modules at the busbar connection terminals. Continuous splicing modules with consistent phase sequence conduction directions are grouped into the same group.

[0043] The segment boundary refers to the dividing position between two adjacent splicing modules in the splicing module grouping result where the phase sequence conduction direction changes. It is used to define the start and end of different phase sequence conduction segments.

[0044] A phase sequence transmission chain segment is an electrical segment composed of several spliced ​​modules with the same and continuous phase sequence transmission direction. Within the same chain segment, the phase sequence transmission direction markings of all busbar connection terminals are consistent, and the power phase sequence follows the same arrangement rule when transmitted along the chain segment.

[0045] The busbar connection point sequence is an ordered list obtained by sorting all busbar connection terminals in the phase sequence conduction chain segment according to the electrical connection direction. It reflects the cascading order of each busbar connection point in the chain segment.

[0046] In detail, based on the established cascade topology, starting from the initial splicing module on the power feed side, the power conduction direction of each busbar connection terminal is determined step by step along the electrical connection direction corresponding to the busbar connection terminal.

[0047] The actual physical arrangement order of the three phase lines (A, B, and C) at each busbar connection terminal is collected, and a corresponding phase sequence conduction direction identifier is generated based on this arrangement order. Subsequently, based on the phase sequence conduction direction identifiers corresponding to each busbar connection terminal and the connection relationship of adjacent splicing modules in the cascade topology, a step-by-step comparison is performed on the splicing modules that are adjacent along the electrical connection direction to determine whether their phase sequence conduction direction identifiers at the busbar connection terminals are consistent. Based on the comparison results, consecutive splicing modules with consistent phase sequence conduction direction identifiers are grouped into the same group, thus completing the generation of splicing module grouping results.

[0048] Identify the turning point where the phase sequence conduction direction indicator changes between two adjacent groups in the grouping results, determine the position as the chain segment boundary, and divide the entire cascaded topology into multiple independent phase sequence conduction chain segments using the chain segment boundary as the dividing point.

[0049] Finally, for each phase sequence conduction chain segment, the busbar connection terminals inside the chain segment are electrically connected and sorted along the electrical connection direction according to the cascade topology relationship. The busbar connection terminals inside the chain segment are arranged into an ordered queue according to the actual order of power conduction from front to back, and finally the busbar connection point sequence reflecting the front-to-back order of the connection points inside each chain segment is obtained.

[0050] S3. Statistically analyze the phase difference distribution of the three-phase incoming current on both sides of each busbar connection point in the busbar connection point sequence within the chain segment, determine the phase sequence switching direction of each phase sequence conduction chain segment based on the phase difference distribution, and generate the phase sequence adjustment sequence of each phase sequence conduction chain segment based on the phase sequence switching direction. In this embodiment, the step of statistically analyzing the phase-to-phase difference distribution of the three-phase incoming currents on both sides of each busbar connection point in the busbar connection point sequence within the chain segment includes: Extract the phase-to-phase angle of the three-phase incoming current on both sides of the busbar connection point in the busbar connection point sequence within the chain segment to obtain the phase-to-phase offset. Based on the phase offset, the phase compensation difference of the three-phase incoming current on both sides of the busbar connection point is calculated to obtain the phase compensation phase current deviation. Combining the phase compensation phase-to-phase current deviation and the arrangement order of the busbar connection point sequence within the chain segment, the cumulative deviation of the busbar connection points along the cascade direction is statistically analyzed to obtain the cascade cumulative phase-to-phase deviation. Based on the cascaded cumulative phase-to-phase deviation and the phase-to-phase offset, the phase sequence conduction chain segments are subjected to difference interval merging statistics to obtain the phase-to-phase difference distribution of the phase sequence conduction chain segments.

[0051] Specifically, the phase angle refers to the phase difference between any two phases in a three-phase alternating current, used to describe the relative offset of the two-phase current waveforms on the time axis.

[0052] The phase offset between phases is obtained by extracting the phase angle between corresponding phases in the three-phase incoming current of the splicing modules on both sides of the busbar connection point, and thus obtaining the specific phase difference data.

[0053] Phase compensation difference calculation is the process of aligning and compensating the three-phase incoming currents on both sides of the busbar connection point in the phase dimension based on the obtained phase offset, and then calculating the difference between the currents on both sides.

[0054] Phase compensation phase-to-phase current deviation is the current deviation value obtained after phase compensation difference calculation. It reflects the actual difference between the three-phase incoming currents on both sides of the busbar connection point after eliminating the influence of phase offset.

[0055] Specifically, the cascading direction refers to the forward and backward conduction path determined by the electrical connection direction of the busbar connection terminals, that is, the step-by-step transmission direction from the power supply input side to the end load side.

[0056] Deviation conduction accumulation refers to the process of accumulating the phase compensation phase current deviation at each busbar connection point in sequence along the cascade direction, according to the arrangement of the busbar connection point sequence.

[0057] The result obtained after the cascaded cumulative phase deviation is carried out by the deviation propagation and accumulation operation reflects the comprehensive value of the deviations of each point along the cascade direction at the busbar connection point.

[0058] Specifically, difference interval merging statistics refers to the process of classifying, merging, and summarizing all busbar connection points within the phase sequence transmission chain segment according to the magnitude range of the deviation values, based on two dimensions: cascaded cumulative phase deviation and phase offset.

[0059] The phase difference distribution is the result obtained after merging and statistically analyzing the difference intervals, reflecting the distribution of each busbar connection point in the phase sequence transmission chain segment in different deviation intervals.

[0060] In detail, taking the busbar connection point sequence within the phase sequence transmission chain segment as the operation path, at each busbar connection point, the phase angles of each phase of the three-phase incoming current of the upstream splicing module and the phase angles of each phase of the three-phase incoming current of the downstream splicing module are obtained. The phase offset of the busbar connection point is obtained by comparing the difference between the corresponding phase angles on both sides.

[0061] After aligning the relative positions of the currents on both sides in the phase dimension based on the phase offset, the difference between the current values ​​on both sides is calculated phase by phase to obtain the phase compensation phase current deviation of each busbar connection point.

[0062] Subsequently, based on the order of the busbar connection points, the deviation propagation and accumulation are performed point by point along the cascade direction starting from the beginning of the chain segment. The phase compensation phase-to-phase current deviation of the current busbar connection point is superimposed with the accumulated value transmitted from upstream to form the cascaded accumulated phase-to-phase deviation at that point, and continues to be transmitted to the next stage until the cumulative calculation of all busbar connection points in the chain segment is completed.

[0063] Based on the two dimensions of cascaded cumulative phase deviation and phase offset of each busbar connection point, all busbar connection points in the chain segment are divided into different numerical intervals according to the magnitude of the cascaded cumulative phase deviation and phase offset. Connection points falling into the same interval are merged and summarized for statistical analysis, and finally, the phase difference distribution reflecting the overall deviation status of the phase sequence transmission chain segment is generated.

[0064] In this embodiment, generating the phase sequence adjustment sequence for each phase sequence conduction chain segment in the phase sequence rotation direction includes: The phase sequence rotation direction and the sequence of busbar connection points within the chain segment are mapped point by point to obtain the target phase sequence arrangement of the busbar connection points; Based on the sequence of mother row connection points within the chain segment, the execution order of each mother row connection point is arranged in a cascade order to obtain the cascade execution order of each mother row connection point. Combining the cascaded execution order and the target phase sequence arrangement, the phase sequence rotation operation of the busbar connection point is encapsulated to obtain the phase sequence rotation operation instruction of the busbar connection point; Based on the phase sequence rotation operation command, the adjustment command sequence of each phase sequence conduction chain segment is arranged to obtain the phase sequence adjustment sequence of each phase sequence conduction chain segment.

[0065] Specifically, the target phase sequence arrangement refers to the final phase arrangement state that the three phases at the busbar connection point should present after the phase sequence rotation operation is performed on the busbar connection point.

[0066] The cascade execution order is based on the arrangement of the busbar connection point sequence, which determines the execution order of each busbar connection point in the phase sequence transmission chain segment, and thus determines the point-by-point implementation order of the phase sequence rotation operation in the cascade direction.

[0067] Phase sequence rotation operation encapsulation is the process of integrating the execution position information of the busbar connection point, the target phase sequence arrangement information, and the corresponding phase sequence rotation direction information into an executable operation unit.

[0068] Specifically, the phase sequence rotation operation instruction is an executable operation unit generated after the phase sequence rotation operation is encapsulated. This instruction contains all the information required to perform the phase sequence rotation operation at the corresponding busbar connection point.

[0069] Specifically, adjusting the instruction sequence arrangement refers to the process of arranging and combining the phase sequence rotation operation instructions corresponding to all busbar connection points within the phase sequence transmission chain segment in an orderly manner according to the cascading execution order.

[0070] The phase sequence adjustment sequence is a complete instruction queue generated after the adjustment instruction sequence is arranged. It contains a set of phase sequence rotation operation instructions arranged in the order of execution of all busbar connection points in the phase sequence transmission chain segment.

[0071] In detail, based on the phase sequence rotation direction of the phase sequence transmission chain segment, and combined with the busbar connection point sequence of the chain segment, the phase sequence arrangement mapping is performed point by point along the sequence. Specifically, for each busbar connection point in the busbar connection point sequence, the current phase arrangement state of the connection point is converted into the rotated phase arrangement state according to the phase cyclic shift method specified by the corresponding phase sequence rotation direction, thereby generating the target phase sequence arrangement of each busbar connection point.

[0072] Then, according to the sequential position relationship from the beginning to the end of the busbar connection point sequence, each busbar connection point is assigned a sequence number for performing phase sequence rotation operations within the chain segment, forming a cascaded execution order of each busbar connection point. The cascaded execution order of each busbar connection point and the target phase sequence arrangement are integrated, and a phase sequence rotation operation encapsulation operation is performed. That is, for each busbar connection point, its corresponding execution order position, target phase sequence arrangement content, and phase sequence rotation direction information are combined into a complete phase sequence rotation operation instruction, so that each instruction can independently and completely describe the rotation operation content to be performed at that connection point.

[0073] Finally, within the phase sequence transmission chain segment, based on the cascade execution order, the phase sequence rotation operation instructions for all busbar connection points within the chain segment are arranged into an adjustment instruction sequence. Each instruction is arranged and combined in ascending order of execution to ultimately generate the phase sequence adjustment sequence.

[0074] S4. According to the phase sequence adjustment sequence, perform phase sequence rotation on the busbar connection points in each phase sequence conduction chain segment in sequence, and after each rotation, check whether the three-phase incoming current on both sides of the corresponding busbar connection point has been restored to three-phase symmetry. In this embodiment, the step of sequentially performing phase sequence rotation on the busbar connection points within each phase sequence conduction chain segment according to the phase sequence adjustment sequence, and detecting whether the three-phase incoming currents on both sides of the corresponding busbar connection point have recovered three-phase symmetry after each rotation, includes: According to the phase sequence adjustment sequence, the busbar connection points in each phase sequence transmission chain segment are rotated to obtain the phase sequence state after rotation; The three-phase incoming current after the phase sequence state after the rotation is re-acquired to obtain the rotation three-phase incoming current; Based on the alternating three-phase incoming current, determine whether the three-phase symmetry is restored on both sides of the busbar connection point.

[0075] Specifically, phase sequence switching refers to the operation of switching the phases of the three-phase power supply wiring at the busbar connection point. Specifically, it involves adjusting each phase conductor from its current connection position to the connection position corresponding to the target phase sequence arrangement according to the phase sequence switching direction.

[0076] The phase sequence status after rotation refers to the actual phase arrangement of phases A, B, and C at the busbar connection point after the phase sequence rotation operation is completed.

[0077] The alternating three-phase incoming current is the three-phase incoming current data of the splicing modules on both sides of the busbar connection point that is re-acquired after the phase sequence alternation is completed at the busbar connection point.

[0078] Three-phase symmetry refers to the balanced operating state of a three-phase AC system when the current amplitudes of phases A, B, and C are equal and their phases differ by 120 degrees. In this state, the three-phase current values ​​are balanced with each other.

[0079] In detail, based on the phase sequence adjustment sequence of the phase sequence transmission chain segment, the phase sequence rotation is performed sequentially on the busbar connection points within the chain segment according to the cascade execution order arranged in the sequence. That is, for the busbar connection point that is currently in turn, according to the phase sequence rotation direction and target phase sequence arrangement specified in its phase sequence rotation operation instruction, the three-phase conductors at the connection point are switched from the current phase connection relationship to the phase connection relationship corresponding to the target phase sequence arrangement by controlling the internal phase line switching execution unit. After the phase sequence switching of the connection point is completed, the phase sequence state after the rotation is recorded.

[0080] Next, using the same power frequency electromagnetic induction detection method, detection was performed on the upstream splicing module side and the downstream splicing module side of the connection point before the phase sequence switching operation, respectively, to obtain the three-phase incoming current value after the switching operation was completed, which was used as the switching three-phase incoming current.

[0081] The three-phase symmetry judgment is performed based on the alternating three-phase incoming current on both sides of the busbar connection point. This involves comparing the three-phase current values ​​on the upstream splicing module side with the three-phase current values ​​on the downstream splicing module side one by one to check whether the currents of each phase and the corresponding currents on both sides have reached a state of mutual balance. Based on the comparison results, a judgment is made on whether the three-phase symmetry on both sides of the busbar connection point has been restored.

[0082] After determining the current busbar connection point, the above-mentioned rotation, acquisition, and determination are performed on the next busbar connection point in the chain segment according to the phase sequence adjustment sequence, until all busbar connection points in the phase sequence transmission chain segment have been processed.

[0083] S5. When it is detected that the three-phase incoming current of the splicing modules on both sides of the busbar connection point has not been restored to three-phase symmetry, locate the cascade position of the splicing module that has not been restored to three-phase symmetry in the phase sequence conduction chain segment, and reverse the phase sequence rotation direction of each busbar connection point after the busbar connection point in the phase sequence adjustment sequence according to the cascade position. In this embodiment, when it is detected that the three-phase incoming current of the splicing modules on both sides of the busbar connection point has not recovered three-phase symmetry, locating the cascaded position of the splicing module that has not recovered three-phase symmetry in the phase sequence conduction chain segment includes: Based on whether the three-phase symmetry is restored, the busbar connection points that have not been restored are filtered out to obtain the busbar connection points that have not been restored. Based on the busbar connection point sequence within the chain segment, the splicing modules on both sides of the unrecovered busbar connection point are identified to obtain the unrecovered splicing module; By using the cascade topology, the cascade sequence number of the unrestored splicing modules is located to obtain the cascade position.

[0084] Specifically, the cascade sequence number is a sequence number assigned to each splicing module in the cascade topology. This sequence number increases along the direction of electrical connection and is used to identify the relative position of the splicing module in the entire cascade path.

[0085] The cascade position is the actual cascade sequence number of the unrestored splicing module in the phase sequence conduction chain segment, reflecting the specific position of the module along the electrical connection direction within the chain segment.

[0086] In detail, the filtering is performed on all busbar connection points within the phase sequence transmission chain segment based on the judgment result of whether the three-phase symmetry of each busbar connection point is restored. Specifically, the judgment result corresponding to each busbar connection point is checked one by one, and the busbar connection points marked as not restoring three-phase symmetry are extracted to form a set of busbar connection points that have not been restored.

[0087] Subsequently, using the busbar connection point sequence within the chain segment as a reference, the splicing modules on both sides of each unrecovered busbar connection point are identified. That is, based on the position information corresponding to the connection point in the busbar connection point sequence, the preceding splicing module is located upstream and the following splicing module is located downstream along the cascading direction. The splicing module numbers connected to both sides of the connection point are determined through the sequence mapping relationship, thereby obtaining the set of unrecovered splicing modules.

[0088] Finally, based on the cascade topology, the cascade sequence number is used to locate the unrestored splicing modules. That is, in the established cascade topology, the sequence number corresponding to the splicing module is searched in the order from front to back according to the electrical connection direction. The sequence number is determined as the cascade position of the module in the phase sequence conduction chain segment, thus completing the accurate location of the unrestored splicing modules.

[0089] In this embodiment, the phase sequence rotation direction of each busbar connection point after the busbar connection point in the phase sequence adjustment sequence is reversed according to the cascade position.

[0090] Specifically, the phase sequence rotation direction refers to the rotation path followed when performing phase switching operations on the busbar connection point within the phase sequence transmission chain segment to improve the three-phase imbalance. It is specifically manifested as a cyclic shifting mode of phases, such as phase A being replaced by phase B, phase B being replaced by phase C, and phase C being replaced by phase A.

[0091] In detail, the cascade position is used as the starting point for the correction operation. Based on the cascade position, the range to be corrected is extracted in the phase sequence adjustment sequence. That is, the busbar connection point corresponding to the cascade position is found in the phase sequence adjustment sequence, and all busbar connection point instructions after the connection point are extracted to form a set of busbar connection points to be corrected. At the same time, the phase sequence rotation direction of each busbar connection point is read one by one from the instruction set.

[0092] Next, the phase sequence rotation direction is reversed for each busbar connection point in the extracted set of busbar connection points to be corrected. Specifically, the phase cyclic shift method specified by the current phase sequence rotation direction is changed to the opposite cyclic shift method. That is, if the current direction is a clockwise cyclic shift from phase A to phase B, from phase B to phase C, and from phase C to phase A, the corrected direction becomes a counterclockwise cyclic shift from phase A to phase C, from phase C to phase B, and from phase B to phase A. The direction of all connection points in the set of busbar connection points to be corrected is reversed one by one to obtain the corrected phase sequence rotation direction corresponding to each connection point.

[0093] Simultaneously, with the correction of the phase sequence rotation direction as the update content, a cover update is performed on the phase sequence adjustment sequence. That is, the original phase sequence rotation direction of each busbar connection point in the set of busbar connection points to be corrected in the phase sequence adjustment sequence is replaced one by one with the corresponding corrected phase sequence rotation direction, while the content of other positions remains unchanged. After completing the reverse correction of the phase sequence rotation direction of each busbar connection point after the busbar connection point, the correction is performed on the phase sequence rotation direction of each busbar connection point.

[0094] S6. When the three-phase incoming current of the splicing modules on both sides of each busbar connection point in all phase sequence conduction chain segments is restored to three-phase symmetry, the phase sequence status of each busbar connection point is locked, and an online dynamic phase sequence allocation control command is generated.

[0095] In this embodiment, locking the current phase sequence status of each of the busbar connection points and generating online dynamic phase sequence allocation control commands includes: Read the current phase sequence state of each busbar connection point within the phase sequence conduction chain segment, and write-protect lock the current phase sequence state to obtain the locked phase sequence state; Based on the locked phase sequence state and the cascaded topology, the phase sequence allocation instruction is encoded for the busbar connection point to obtain the phase sequence allocation control code; The phase sequence allocation control code is encapsulated and sent to the phase sequence transmission chain segment to obtain online dynamic phase sequence allocation control instructions.

[0096] Specifically, write protection locking applies write protection measures to the phase sequence state of the busbar connection point to prevent any unauthorized write or modification actions, ensuring that the state will not be changed by other processes or unexpected events after locking.

[0097] The locked phase sequence state is the phase sequence state at the busbar connection point that is fixed and protected after a write-protection locking operation. This state is the locked phase sequence state.

[0098] Phase sequence allocation instruction encoding is the process of converting the locked phase sequence status information of the busbar connection point and the position information in the cascaded topology into a specific format encoding.

[0099] The phase sequence allocation control code is generated after the phase sequence allocation instruction encoding operation and contains the phase sequence allocation information of the busbar connection point.

[0100] Encapsulation and delivery is the process of packaging the generated phase sequence allocation control code into a transmittable and identifiable data frame and sending it to the corresponding target device through a communication link.

[0101] The online dynamic phase sequence allocation control command is the final control command formed after encapsulation and issuance. This command contains the phase sequence allocation information of each busbar connection point in all phase sequence conduction chain segments.

[0102] In detail, after confirming that the three-phase incoming current of the splicing modules on both sides of each busbar connection point in all phase sequence conduction chain segments has been restored to three-phase symmetry, the current three-phase arrangement status of each busbar connection point in each phase sequence conduction chain segment is read one by one, and all the read status information is collected and summarized. On this basis, write protection locking is performed on the current phase sequence status of each busbar connection point. By writing to the protection flag or setting the lock flag in the status register, the status can be prevented from being modified in subsequent operations, thus obtaining the lock phase sequence status of each connection point.

[0103] Then, using the locked phase sequence status and cascaded topology of each busbar connection point as the data source, the phase arrangement information of each connection point described by the locked phase sequence status is associated and combined with the corresponding busbar connection point position information in the cascaded topology. This information is then converted into a structured phase sequence allocation control code according to a predetermined encoding format, so that the encoded content can completely and uniquely describe the allocation configuration of each busbar connection point.

[0104] Finally, the encoded content is packaged into data frames according to the requirements of the communication protocol. After adding the target address and verification information, the encapsulated data is sent to the execution unit in the corresponding phase sequence transmission chain through the communication network. Each execution unit receives and parses the data and maintains the corresponding phase sequence state according to the instruction content, and finally forms and outputs the online dynamic phase sequence allocation control instruction.

[0105] In this embodiment, the step of obtaining the online dynamic phase sequence allocation control command further includes: Extract a preset standard instruction library, and remove abnormal instructions from the online dynamic phase sequence allocation control instructions according to the standard instruction library.

[0106] Specifically, the standard instruction library is a set of instruction specifications that are pre-configured and stored in the system. This library contains all the format requirements, value range limits, and structural specifications of legal phase sequence allocation control instructions, serving as a reference benchmark for determining whether an instruction is valid.

[0107] In detail, the standard instruction library is extracted from the designated storage area within the system, that is, the standard instruction library data that has been pre-configured and stored in this area is completely read out and used as a reference benchmark for subsequent comparison and screening operations.

[0108] Based on the extracted standard instruction library, the content and format of each instruction are compared with the legal specifications in the standard instruction library item by item to check for any format mismatch, incomplete structure, parameters exceeding the allowable range, or inconsistencies with the standard instruction library specifications. For abnormal instructions that are determined to be non-compliant with the specifications during the comparison process, they are deleted from the online dynamic phase sequence allocation control instructions, and only the legal instructions that pass the comparison are retained.

[0109] In the several embodiments provided by this invention, it should be understood that the disclosed methods and systems can be implemented in other ways. For example, the system embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and other division methods may be used in actual implementation.

[0110] The modules described as separate components may or may not be physically separate. The components shown as modules 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 modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0111] Furthermore, the functional modules in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in the form of hardware plus software functional modules.

[0112] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0113] The embodiments of this application can acquire and process relevant data based on artificial intelligence technology. Artificial intelligence is the theory, method, technology, and application system that uses digital computers or machines controlled by digital computers to simulate, extend, and expand human intelligence, perceive the environment, acquire knowledge, and use that knowledge to obtain optimal results.

[0114] Finally, it should be noted that 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 preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for online dynamic phase sequence allocation control of a modular multi-position metering box, characterized in that, The method includes: S1. Collect the three-phase incoming current of each splicing module in the splicing multi-position metering box, and obtain the cascade topology relationship of the busbar connection terminals between each splicing module; S2. According to the cascade topology, along the electrical connection direction of the busbar connection terminals, the splicing modules with the same and continuous phase sequence conduction direction are divided into the same phase sequence conduction chain segment to obtain the busbar connection point sequence within the chain segment; S3. Statistically analyze the phase difference distribution of the three-phase incoming current on both sides of each busbar connection point in the busbar connection point sequence within the chain segment, determine the phase sequence switching direction of each phase sequence conduction chain segment based on the phase difference distribution, and generate the phase sequence adjustment sequence of each phase sequence conduction chain segment based on the phase sequence switching direction. S4. According to the phase sequence adjustment sequence, perform phase sequence rotation on the busbar connection points in each phase sequence conduction chain segment in sequence, and after each rotation, check whether the three-phase incoming current on both sides of the corresponding busbar connection point has been restored to three-phase symmetry. S5. When it is detected that the three-phase incoming current of the splicing modules on both sides of the busbar connection point has not been restored to three-phase symmetry, locate the cascade position of the splicing module that has not been restored to three-phase symmetry in the phase sequence conduction chain segment, and reverse the phase sequence rotation direction of each busbar connection point after the busbar connection point in the phase sequence adjustment sequence according to the cascade position. S6. When the three-phase incoming current of the splicing modules on both sides of each busbar connection point in all phase sequence conduction chain segments is restored to three-phase symmetry, the phase sequence status of each busbar connection point is locked, and an online dynamic phase sequence allocation control command is generated.

2. The online dynamic phase sequence allocation control method for a spliced ​​multi-position metering box as described in claim 1, characterized in that, The method of collecting the three-phase incoming current of each splicing module in the spliced ​​multi-position metering box and obtaining the cascade topology relationship of the busbar connection terminals between each splicing module includes: The power frequency electromagnetic induction of the three-phase incoming circuit corresponding to each splicing module in the spliced ​​multi-position metering box is collected to obtain the three-phase incoming current of the splicing module; Low-voltage DC conduction excitation detection is performed on the busbar connection terminals between each of the splicing modules to obtain the conduction state of each of the busbar connection terminals and the splicing module number on both sides corresponding to the conduction state; Based on the conduction state and the splicing module numbers on both sides, the cascading order of the busbar connection terminals is arranged in the direction of electrical connection to obtain a cascading topology.

3. The online dynamic phase sequence allocation control method for a spliced ​​multi-position metering box as described in claim 1, characterized in that, The method of grouping the splicing modules with consistent and continuous phase sequence conduction directions along the electrical connection direction of the busbar connection terminals into the same phase sequence conduction chain segment to obtain the busbar connection point sequence within the chain segment includes: Determine the electrical connection direction corresponding to the busbar connection terminals in the cascaded topology; The three-phase wiring arrangement of each busbar connection terminal is sequentially detected along the electrical connection direction to obtain the phase sequence conduction direction indicator; Based on the phase sequence conduction direction identifier and the cascade topology, the phase sequence conduction direction consistency of adjacent splicing modules is compared to obtain the splicing module grouping result; The chain segment boundaries of the grouping results of the splicing module are delineated to obtain the phase sequence transmission chain segments; Based on the cascaded topology, the busbar connection terminals within the phase sequence conduction chain segment are electrically connected and sorted to obtain the busbar connection point sequence within the chain segment.

4. The online dynamic phase sequence allocation control method for a spliced ​​multi-position metering box as described in claim 3, characterized in that, The statistical analysis of the phase-to-phase difference distribution of the three-phase incoming current on both sides of each busbar connection point in the busbar connection point sequence within the chain segment includes: Extract the phase-to-phase angle of the three-phase incoming current on both sides of the busbar connection point in the busbar connection point sequence within the chain segment to obtain the phase-to-phase offset. Based on the phase offset, the phase compensation difference of the three-phase incoming current on both sides of the busbar connection point is calculated to obtain the phase compensation phase current deviation. Combining the phase compensation phase-to-phase current deviation and the arrangement order of the busbar connection point sequence within the chain segment, the cumulative deviation of the busbar connection points along the cascade direction is statistically analyzed to obtain the cascade cumulative phase-to-phase deviation. Based on the cascaded cumulative phase-to-phase deviation and the phase-to-phase offset, the phase sequence conduction chain segments are subjected to difference interval merging statistics to obtain the phase-to-phase difference distribution of the phase sequence conduction chain segments.

5. The online dynamic phase sequence allocation control method for a spliced ​​multi-position metering box as described in claim 1, characterized in that, The step of generating the phase sequence adjustment sequence for each phase sequence conduction chain segment in the phase sequence rotation direction includes: The phase sequence rotation direction and the sequence of busbar connection points within the chain segment are mapped point by point to obtain the target phase sequence arrangement of the busbar connection points; Based on the sequence of busbar connection points within the chain segment, the execution order of each busbar connection point is arranged in a cascade order to obtain the cascade execution order of each busbar connection point. Combining the cascaded execution order and the target phase sequence arrangement, the phase sequence rotation operation of the busbar connection point is encapsulated to obtain the phase sequence rotation operation instruction of the busbar connection point; Based on the phase sequence rotation operation command, the adjustment command sequence of each phase sequence conduction chain segment is arranged to obtain the phase sequence adjustment sequence of each phase sequence conduction chain segment.

6. The online dynamic phase sequence allocation control method for a spliced ​​multi-position metering box as described in claim 5, characterized in that, The step of performing phase sequence rotation on the busbar connection points within each phase sequence conduction chain segment according to the phase sequence adjustment sequence, and detecting whether the three-phase incoming current on both sides of the corresponding busbar connection point has returned to three-phase symmetry after each rotation, includes: According to the phase sequence adjustment sequence, the busbar connection points in each phase sequence transmission chain segment are rotated to obtain the phase sequence state after rotation; The three-phase incoming current after the phase sequence state after the rotation is re-acquired to obtain the rotation three-phase incoming current; Based on the alternating three-phase incoming current, determine whether the three-phase symmetry is restored on both sides of the busbar connection point.

7. The online dynamic phase sequence allocation control method for a spliced ​​multi-position metering box as described in claim 1, characterized in that, When it is detected that the three-phase incoming current of the splicing modules on both sides of the busbar connection point has not returned to three-phase symmetry, the location of the cascaded position of the splicing module that has not returned to three-phase symmetry in the phase sequence conduction chain segment includes: Based on whether the three-phase symmetry is restored, the busbar connection points that have not been restored are filtered out to obtain the busbar connection points that have not been restored. Based on the busbar connection point sequence within the chain segment, the splicing modules on both sides of the unrecovered busbar connection point are identified to obtain the unrecovered splicing module; By using the cascade topology, the cascade sequence number of the unrestored splicing modules is located to obtain the cascade position.

8. The online dynamic phase sequence allocation control method for a spliced ​​multi-position metering box as described in claim 7, characterized in that, The step of reversing the phase sequence rotation direction of each busbar connection point after the cascaded position in the phase sequence adjustment sequence includes: Based on the cascaded position, the set of busbar connection points to be corrected in the phase sequence adjustment sequence is extracted, and the current phase sequence rotation direction of the set of busbar connection points to be corrected is extracted. The current phase sequence rotation direction is reversed and corrected to obtain the corrected phase sequence rotation direction; In conjunction with the corrected phase sequence rotation direction, the phase sequence adjustment sequence is updated by covering the phase sequence rotation direction to obtain the corrected phase sequence rotation direction.

9. The online dynamic phase sequence allocation control method for a spliced ​​multi-position metering box as described in claim 1, characterized in that, The step of locking the phase sequence status of each of the busbar connection points and generating online dynamic phase sequence allocation control commands includes: Read the current phase sequence state of each busbar connection point within the phase sequence conduction chain segment, and write-protect lock the current phase sequence state to obtain the locked phase sequence state; Based on the locked phase sequence state and the cascaded topology, the phase sequence allocation instruction is encoded for the busbar connection point to obtain the phase sequence allocation control code; The phase sequence allocation control code is encapsulated and sent to the phase sequence transmission chain segment to obtain online dynamic phase sequence allocation control instructions.

10. The online dynamic phase sequence allocation control method for a spliced ​​multi-position metering box as described in claim 1, characterized in that, The step of obtaining the online dynamic phase sequence allocation control command further includes: Extract a preset standard instruction library, and remove abnormal instructions from the online dynamic phase sequence allocation control instructions based on the standard instruction library.

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