An industrial internet-based remote operation and maintenance method and system for charging stations

Abstract

The present application relates to the technical field of maintenance and repair operation management, and discloses a charging station remote operation and maintenance method and system based on an industrial internet, comprising the following steps: obtaining a link section table and operation messages in a station, aligning the operation messages according to time to obtain operation time slices, attributing interface current to power distribution branches and charging piles, calculating link current differences and screening abnormal candidate sections in combination with environmental temperature, determining cable aging or node contact poor boundaries according to pressure drop, temperature rise and alarm codes, and generating branch disconnection or power reduction control instructions. The present application unifies power supply and power receiving nodes, rated current, pressure drop threshold and temperature rise threshold to the electrical topology in the station through the link section table, makes multiple source operation messages cross and verify in the same time slice, first compresses the investigation range according to dynamic current deviation, then distinguishes fault properties according to pressure drop and temperature rise, improves remote positioning accuracy, reduces unified shutdown and artificial inspection dependence, and guarantees charging continuity.

Description

Technical Field

[0001] This invention relates to the field of maintenance, repair, operation and management technology, and in particular to a method and system for remote operation and maintenance of charging stations based on the Industrial Internet. Background Technology

[0002] The field of maintenance, repair, and operation management technology involves a computerized management system for equipment operating status, maintenance records, work order flow, and operating parameters. This typically includes the reading, writing, and retrieval of data objects such as equipment ledgers, status data, maintenance records, and task rules between servers, databases, and clients. Traditional remote operation and maintenance methods for charging stations based on the Industrial Internet involve connecting charging piles, power distribution equipment, metering devices, and station control terminals to an Industrial Internet platform. Field data acquisition devices then collect voltage, current, temperature, alarm codes, and operating logs, which are uploaded to the operation and maintenance server via a gateway. The server then remotely monitors the charging station equipment, registers faults, dispatches maintenance tasks, and archives maintenance records based on equipment number, fault type, maintenance plan, and work order status.

[0003] Traditional remote operation and maintenance revolves around monitoring, registration, dispatching, and archiving based on equipment number, fault type, maintenance plan, and work order status. On-site voltage, current, temperature, alarm codes, and logs are mostly used for post-event recording after being uploaded through the gateway. There is a lack of hierarchical electrical relationship mapping between inbound lines, interfaces, branches, and charging piles within the station. It is difficult to cross-verify current difference, voltage drop, temperature rise, and alarms within the same time frame. Fault location tends to remain at the equipment level or alarm level. The boundary between cable aging and abnormal node contact is unclear. Handling instructions tend to be uniform shutdown or manual inspection, which affects charging continuity and maintenance efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a remote operation and maintenance method and system for charging stations based on the Industrial Internet. By associating the electrical topology, operation messages, time slice alignment, current difference, voltage drop, temperature rise and alarm codes within the station, the abnormal location and fault boundary of the charging station link segment are remotely determined, and a branch disconnection or power reduction control command is generated based on the determination result, so as to meet the technical requirements of link-level location, fault nature differentiation and continuous control in the remote operation and maintenance of charging stations.

[0005] To achieve the above objectives, this invention provides a remote operation and maintenance method for charging stations based on the Industrial Internet, comprising the following steps: The system obtains the in-station link segment table and operation messages. The in-station link segment table records the power supply and receiving nodes, the rated current limit, the allowable voltage drop threshold, and the allowable temperature rise threshold. The operation messages carry the voltage and current of the incoming line and interface, the switch status, the pile body temperature, the alarm code, and the message time.

[0006] Based on the message time, the running message is time-delay aligned and assigned to the running time slice. The interface current is assigned to the power distribution branch and charging pile according to the in-station link segment table, generating a hierarchical operating status.

[0007] For each link segment in the graded operation state, the difference between the metered current and the lower-level current is calculated and compared with the allowable current deviation threshold dynamically generated based on the ambient temperature to determine the candidate segment for current anomaly.

[0008] The link voltage drop is obtained by calculating the voltage between the upper and lower levels of the candidate current anomaly segment, and the pile body temperature rise is obtained by calculating the temperature difference between adjacent time slices. When the link voltage drop is greater than the allowable voltage drop threshold and the pile body temperature rise is lower than the allowable temperature rise threshold, the fault boundary is determined to be cable aging. When the link voltage drop is not greater than the allowable voltage drop threshold and the pile body temperature rise is greater than the allowable temperature rise threshold and is accompanied by the alarm code, the fault boundary is determined to be poor node contact.

[0009] Based on the fault boundary generation instructions, when it is determined that the cable is aging, a branch disconnection instruction is generated; when it is determined that the node has poor contact, a charging pile control instruction with reduced power is generated first.

[0010] Further, when obtaining the intra-station link segment table and the operation message, the intra-station link segment table generated by the station-level power distribution topology configuration table is obtained, and the corresponding records between the power supply and receiving nodes, the rated current upper limit, the allowable voltage drop threshold, and the allowable temperature rise threshold in the intra-station link segment table are parsed. A link segment identifier is established according to the connection direction between the power supply side node and the power receiving side node in the power supply and receiving nodes. The operation message uploaded by the incoming line metering interface, the branch switch interface, and the charging pile interface is obtained. According to the link segment identifier, the voltage, the current, the switch status, the pile body temperature, the alarm code, and the message time in the operation message are written into the corresponding link segment record to generate a link message record.

[0011] As a further limitation on the link message record generation process, the device address, interface number, and message time in the running message are read. The device address and interface number are used together as the message attribution field, and the message attribution field is matched with the link segment identifier. When the message attribution field matches the link segment identifier, the incoming line voltage, incoming line current, interface voltage, interface current, switch status, pile temperature, and alarm code are written into the same link segment record. When the message attribution field does not match the link segment identifier, the running message is written into the message queue to be verified, and an attribution verification result is generated.

[0012] Further, when generating the hierarchical operation state, the message time and reception time of the same acquisition interface in continuous messages are obtained, the transmission delay of the message time relative to the reception time is calculated, and the message time is corrected according to the delay compensation value corresponding to the acquisition interface to obtain the aligned message time; the operation messages whose aligned message times fall within the same wide range are grouped into the same operation time slice, and according to the power supply and receiving node relationship in the in-station link segment table, the interface current is mapped to the distribution branch node and the charging pile node respectively to generate the hierarchical operation state.

[0013] Further, when determining the candidate segment for current anomaly, the metering current and the lower-level node current of each link segment within the same runtime time slice are obtained. The interface currents belonging to the lower level of the same link segment are filtered according to the power supply and receiving node relationship in the in-station link segment table, and the filtered interface currents are summed to obtain the lower-level current sum value. The difference between the metering current and the lower-level current sum value is calculated to obtain the link current difference value. The ambient temperature is obtained, and the corresponding allowable current deviation threshold is called according to the temperature range to which the ambient temperature belongs. When the link current difference value is greater than the allowable current deviation threshold value, the corresponding link segment is determined as the candidate segment for current anomaly.

[0014] As an additional constraint for dynamically generating the allowable current deviation threshold, the rated current upper limit, the ambient temperature, and the temperature range threshold table corresponding to the link segment are obtained. The temperature correction level is determined based on the temperature range hit by the ambient temperature, and the deviation correction ratio corresponding to the temperature correction level is read. The rated current upper limit and the deviation correction ratio are multiplied to calculate the temperature correction deviation amount. The temperature correction deviation amount is superimposed with the preset basic deviation amount, and the superposition result is subjected to upper limit capping processing to generate the allowable current deviation threshold.

[0015] Further, when determining the fault boundary, the voltage of the upper-level node and the voltage of the lower-level node within the same operating time slice of the candidate current anomaly segment are obtained. Based on the power supply and receiving node directions in the in-station link segment table, the voltage drop of the upper-level node relative to the lower-level node voltage is calculated to obtain the link voltage drop. The temperature of the charging pile corresponding to the candidate current anomaly segment in adjacent operating time slices is obtained. The temperature increase of the charging pile in the later operating time slice relative to the charging pile in the previous operating time slice is calculated to obtain the heating amount of the charging pile. The link voltage drop, the heating amount of the charging pile, the allowable voltage drop threshold, the allowable temperature rise threshold, and the alarm code are combined and compared to determine the fault boundary.

[0016] Furthermore, when generating instructions based on the fault boundary, the candidate current anomaly segment, link segment, and switch state corresponding to the fault boundary are obtained. The target branch switch and target charging pile are determined according to the power supply and receiving node relationship in the in-station link segment table, and the target branch switch and target charging pile are written into the control object record. When the fault boundary is cable aging and the switch state is closed, a branch disconnection instruction carrying the target branch switch is generated. When the fault boundary is poor node contact, a charging pile control instruction carrying the target charging pile with reduced power is generated, and a control instruction set is output.

[0017] As a further limitation of the process of generating the charging pile control command for power reduction, the interface current, the upper limit of the rated current, the pile body temperature rise, and the alarm code corresponding to the target charging pile are obtained. The power reduction level is determined based on the degree to which the pile body temperature rise exceeds the allowable temperature rise threshold, and the power reduction level is increased when the alarm code hits the contact alarm code table. The allowable output current of the target charging pile is reduced according to the power reduction level to obtain the reduced allowable output current, and the reduced allowable output current is compared with the preset minimum holding current. When the reduced allowable output current is not lower than the preset minimum holding current, the charging pile control command for power reduction is generated.

[0018] The present invention also provides a remote operation and maintenance system for charging stations based on the Industrial Internet, which is used to implement the above method, including a data acquisition module, a timing alignment and status classification module, a current anomaly coarse screening module, a cross diagnosis and boundary determination module, and a flexible control command generation module.

[0019] The data acquisition module acquires the in-station link segment table and operation messages. The in-station link segment table records the power supply and receiving nodes, rated current upper limit, allowable voltage drop threshold, and allowable temperature rise threshold. The operation messages carry the voltage and current of the incoming line and interface, switch status, pile temperature, alarm code, and message time. The timing alignment and status classification module performs time delay alignment on the operation messages based on the message time and assigns them to the operation time slice. It assigns the interface current to the distribution branch and charging pile according to the in-station link segment table, generating a graded operation status. The current anomaly coarse screening module calculates the link current difference between the metered current and the lower-level current for each link segment in the graded operation status, and compares it with the allowable current deviation threshold dynamically generated based on the ambient temperature to determine the current anomaly candidate segment. The cross-diagnosis and boundary determination module calculates the link voltage drop between the upper and lower levels of the current anomaly candidate segment to obtain the pile temperature rise by comparing the temperature difference between adjacent time slices. It then determines the fault boundary based on the link voltage drop, the pile temperature rise, the allowable voltage drop threshold, the allowable temperature rise threshold, and the alarm code. The flexible control command generation module is used to generate commands based on the fault boundary, generate a branch disconnect command when the cable is determined to be aging, and prioritize generating a charging pile control command with reduced power when the node has poor contact.

[0020] The present invention has the following beneficial effects: 1. This invention establishes operational constraints between power supply and receiving nodes, rated current, voltage drop threshold, and temperature rise threshold through a link segment table, aligns operational messages into time slices according to message time, and assigns interface current to distribution branches and charging piles, so that the electrical topology within the station and the real-time load are on the same judgment basis. 2. This invention calculates the difference between the metered current and the total current of the next link segment in each link segment, and forms a dynamic deviation boundary by combining the ambient temperature. This can first narrow down the abnormal range, and then perform cross-diagnosis using link voltage drop, pile body temperature rise and alarm codes to distinguish cable aging and poor node contact to the executable fault boundary. 3. This invention triggers branch disconnection or power reduction control separately by fault boundaries, enabling remote handling to shift from unified shutdown to hierarchical control, reducing the scope of false shutdowns, improving the targeting of handling, and ensuring the continuity of charging station operation and maintenance efficiency. Attached Figure Description

[0021] Figure 1 This is a flowchart of the main process for remote operation and maintenance of charging stations according to the present invention; Figure 2 A partial flowchart for generating the link segment table and link message records of this invention; Figure 3 A data flow diagram is generated for the message delay alignment and hierarchical operation status of this invention; Figure 4This is the logic diagram for processing current anomaly candidate segments and allowable current deviation thresholds in this invention; Figure 5 This invention generates a feedback closed-loop diagram for fault boundary determination and control command generation. Detailed Implementation

[0022] The technical solutions described in this invention are further explained below with reference to embodiments. The in-station link segment table, operation messages, operation time slices, graded operation states, link current difference, allowable current deviation threshold, current anomaly candidate segments, link voltage drop, pile body temperature rise, fault boundaries, branch disconnection commands, and power reduction charging pile control commands involved in the following embodiments are all based on the technical solutions described in the protection scope text and application documents. The in-station link segment table is used to characterize the electrical topology relationship between power supply and receiving nodes within the charging station. The operation messages are used to carry the voltage and current of the incoming line and interface, switch status, pile body temperature, alarm codes, and message time. In the following embodiments, parameters such as message time, reception time, aligned message time, ambient temperature, rated current upper limit, allowable voltage drop threshold, allowable temperature rise threshold, temperature range threshold table, deviation correction ratio, preset basic deviation amount, and preset minimum holding current are all obtained or configured within the scope supported by the application documents, without introducing undisclosed values, formulas, or experimental data. This invention does not provide verifiable existing drawings; subsequent drawings are from... Figure 1 The starting number is used to illustrate the process, data flow, logical judgment, interface call, and feedback loop in the embodiments.

[0023] Example 1: Please refer to Figures 1 to 5 This embodiment provides a remote operation and maintenance method for charging stations based on the Industrial Internet. The method uses an in-station link segment table as the electrical topology basis and operation messages as the source of operational status. Operation messages from the incoming metering interface, branch switch interface, and charging pile interface are grouped into the same operational time slice, forming a hierarchical operational status among link segments, distribution branches, and charging piles within the same time slice. Subsequently, by comparing the link current difference with an allowable current deviation threshold dynamically generated based on ambient temperature, candidate segments for current anomalies are first identified. Then, the fault boundary is determined by combining link voltage drop, pile temperature rise, and alarm codes. Finally, a branch disconnection command or a charging pile power reduction control command is generated according to the fault boundary. This method includes five main steps, S1 to S5.

[0024] S1, obtain the intra-site link segment table and operation messages.

[0025] In S1, the executing entity obtains the intra-station link segment table generated from the station-level power distribution topology configuration table. The intra-station link segment table records at least the power supply and receiving nodes, the rated current upper limit, the allowable voltage drop threshold, and the allowable temperature rise threshold. The power supply and receiving nodes include the power supply side node and the power receiving side node. The connection direction between the power supply side node and the power receiving side node is used to determine the electrical direction of the link segment. The rated current upper limit is used to generate the allowable current deviation threshold later. The allowable voltage drop threshold is used to determine whether the link voltage drop exceeds the allowable range later. The allowable temperature rise threshold is used to determine whether the pile body temperature rise exceeds the allowable range later.

[0026] S111: Read the corresponding records of each power supply side node and power receiving side node in the station-level power distribution topology configuration table, and retain the rated current upper limit, allowable voltage drop threshold, and allowable temperature rise threshold in each corresponding record, so that the topology objects and judgment parameters of the same link segment are established in the same record. After this correspondence is formed, subsequent judgments of current, voltage drop, and temperature rise can be traced back to the same link segment record. For example, in the topology record of "400V low-voltage bus side - No. 1 DC charging pile incoming line side", the system extracts and binds the configuration data: rated current upper limit is 250A, allowable voltage drop threshold is 12.0V, and allowable temperature rise threshold is 2.5℃ / min.

[0027] S112, establish link segment identifiers based on the connection direction between the power supply side node and the power receiving side node. The link segment identifier is used for attribution matching during runtime message writing and for subsequent calculation of link current difference and link voltage drop according to the hierarchical node relationship. The generation of the link segment identifier does not change the connection relationship between the power supply and receiving nodes; its function is to convert the station's electrical topology into link segment objects that can be matched and invoked by message fields.

[0028] S113: Obtain operation messages uploaded from the incoming line metering interface, branch switch interface, and charging pile interface. The operation messages carry the voltage and current of the incoming line and interfaces, switch status, charging pile temperature, alarm code, and message time. The incoming line metering interface provides the voltage and current status of the incoming line, the branch switch interface provides the branch switch status and corresponding electrical quantities, and the charging pile interface provides the interface voltage, interface current, charging pile temperature, alarm code, and message time. The operation messages uploaded by each interface participate in subsequent delay alignment based on message time; the order of reception is not directly used as the basis for assigning operation time slices.

[0029] S114: Read the device address, interface number, and message time from the operation message. Use the device address and interface number together as the message attribution field, and match the message attribution field with the link segment identifier. When the message attribution field matches the link segment identifier, write the incoming line voltage, incoming line current, interface voltage, interface current, switch status, pile temperature, and alarm code into the same link segment record to generate a link message record. When the message attribution field does not match the link segment identifier, write the corresponding operation message into the message queue to be verified, and generate an attribution verification result. The message queue to be verified is used to isolate operation messages that cannot be assigned to the link segment table within the station, so that messages that have not been assigned do not participate in the subsequent calculation of link current difference, link voltage drop, and pile temperature rise.

[0030] S2 aligns the operation messages with time delay based on the message time and assigns them to the operation time slice. According to the in-station link segment table, the interface current is assigned to the power distribution branch and the charging pile, and a hierarchical operation status is generated.

[0031] In S2, the execution entity does not directly generate the running status according to the order in which running messages arrive at the server or platform. Instead, it first calculates the transmission delay based on the message time and reception time of consecutive messages from the same acquisition interface, and then corrects the message time according to the delay compensation value corresponding to the acquisition interface to obtain the aligned message time. The aligned message time is used to group messages uploaded from different interfaces into the same running time slice, so that the running data of the incoming line, branch line, and charging pile interfaces can be compared under the same time base.

[0032] S211: For consecutive messages from the same acquisition interface, read the message time and reception time of each running message to determine the transmission delay relative to the reception time. The transmission delay describes the time difference between the transmission of a running message from the acquisition interface to the receiving end. This difference is used to correct for time offsets caused by different transmission paths or upload timings between different interfaces. Assuming a frame of a message uploaded from a charging pile interface carries a message time of 10:15:00.120, and the system records a reception time of 10:15:00.165, the initially calculated single transmission delay is 45ms.

[0033] S212, the message time is corrected according to the latency compensation value corresponding to the acquisition interface to obtain the aligned message time. The latency compensation value corresponds to the acquisition interface, and the corrected aligned message time still maintains the correspondence with the message source. If the running message lacks the message time, reception time, or interface attribution field, making it impossible to complete the alignment, the corresponding message will not enter the state generation process of the same running time slice, and can remain in the pending verification message queue or not participate in subsequent anomaly judgment. In the above scenario, if the system sets the acquisition interface latency compensation value to 45ms based on the historical message average, the offset of the message time is corrected, and its aligned message time is anchored to the time axis of 10:15:00.165.

[0034] S213 groups running messages whose alignment message times fall within the same time slice width into the same running time slice. Within the running time slice, incoming line voltage, incoming line current, interface voltage, interface current, switch status, pile temperature, and alarm codes retain their corresponding link segment identifiers and acquisition interface sources. For the same type of message field repeatedly entering the same link segment record, the field status corresponding to the current running time slice can be retained based on the matching relationship between the message's belonging field and the alignment message time, avoiding data from different time slices being mixed in the same judgment process. In applications, the running time slice width is typically set to 500ms to balance the real-time performance of industrial field control with the tolerance for message acquisition jitter.

[0035] S214: Based on the power supply and receiving node relationships in the in-station link segment table, the interface current is mapped to the distribution branch node and charging pile node respectively, generating a hierarchical operating status. The hierarchical operating status includes at least the correspondence between the link segment and its lower-level interface current, the correspondence between the distribution branch node and its lower-level charging pile node, and the voltage, current, switch status, pile temperature, and alarm code status of each link segment within the same operating time slice. This hierarchical operating status serves as the input to S3, enabling subsequent link current differences to be summed based on the interface current of the lower-level side of the same link segment.

[0036] S3, for each link segment in the hierarchical operation state, calculates the link current difference between the metered current and the lower-level current, and compares it with the allowable current deviation threshold dynamically generated based on the ambient temperature to determine the candidate segment for current anomaly.

[0037] In S3, the executing entity uses the hierarchical operating status within the same runtime slice as the processing object, obtaining the metered current and the lower-level node current for each link segment. The metered current comes from the metering side or incoming side current field of the corresponding link segment, and the lower-level node current comes from the interface current of the lower-level side belonging to the same link segment in the link segment table within the station. The executing entity first sums the lower-level interface currents to obtain the lower-level current total value, and then calculates the difference between the metered current and the lower-level current total value to obtain the link current difference.

[0038] S311: Obtain the metering current and downstream node current of each link segment within the same runtime time slice, and filter the interface currents belonging to the downstream side of the same link segment according to the power supply and receiving node relationship in the in-site link segment table. During the filtering, the link segment identifier is used as the affiliation boundary, and the connection direction between the power supply side node and the power receiving side node is used as the basis for determining the superior and subordinate levels. Interface currents not affixed to the downstream side of the link segment are not included in the downstream current total of the link segment.

[0039] S312, the filtered interface currents are summed to obtain the next-level total current value. The next-level total current value and the metered current of the corresponding link segment are within the same runtime time slice, and both have completed message time alignment. Therefore, the difference between the metered current and the next-level total current value can be used to characterize the current balance status of the same link segment within that runtime time slice.

[0040] S313: Calculate the difference between the metered current and the sum of the downstream currents to obtain the link current difference. This link current difference serves as an intermediate result for the initial anomaly screening and is output to the allowable current deviation threshold comparison stage. If the corresponding link segment lacks metered current or downstream interface current, preventing the formation of the link current difference, then that link segment will not be included in the current anomaly candidate segment determination within the current runtime time slice. The relevant missing status can be retained in the link message record or attribution verification result.

[0041] S314: Obtain the ambient temperature, the upper limit of the rated current corresponding to the link segment, and the temperature range threshold table. Determine the temperature correction level based on the temperature range matched by the ambient temperature, and read the deviation correction ratio corresponding to the temperature correction level. The ambient temperature is used to reflect the impact of the current operating conditions on the allowable range of current deviation. The temperature range threshold table is used to define the correspondence between the ambient temperature and the temperature correction level. The deviation correction ratio is used to convert the upper limit of the rated current into the temperature correction deviation amount.

[0042] S315 calculates the temperature correction deviation by multiplying the rated current upper limit by the deviation correction ratio. This temperature correction deviation is then added to a preset base deviation, and the result is capped to generate an allowable current deviation threshold. This allowable current deviation threshold corresponds to the link segment and the current ambient temperature, preventing mismatches in judgment boundaries caused by using a fixed deviation threshold under different ambient temperature conditions.

[0043] In this step, the dynamic deviation correction formula used by the system to calculate the allowable current deviation threshold is: ; in, This represents the allowable current deviation threshold generated through dynamic calculation; This represents the preset baseline deviation used to compensate for the inherent errors of the measuring equipment; Represents the upper limit of the rated current of the target link segment; The deviation correction ratio represents the temperature correction level and is used to reflect the nonlinear effects of increased cable leakage current and thermal drift of current transformers caused by high temperatures. This represents the upper limit threshold under absolute safety constraints; To select the smaller function, the upper limit of the corresponding execution is capped.

[0044] In the operational scenario, assuming the incoming line metering current of a certain branch is 246A, and the combined downstream current of two connected charging piles is 235A, the difference between the two is calculated to be 11A. At this time, the ambient temperature reported by the meteorological interface is 38℃, falling within the advanced temperature correction range of [35℃, 45℃]. The system then looks up the deviation correction ratio from the table. It is 2.5%. Preset basic deviation. The rated current is 3.0A, corresponding to the upper limit of the rated current of the link. It is 250A, with an upper limit cap. Set the current to 10A. Substitute the parameters into the formula to calculate: Temperature correction deviation amount is Added to the basic deviation, we get ; Since 9.25A does not exceed the capped value of 10A, the system will... It has been determined to be 9.25A.

[0045] In step S316, the link current difference is compared with the allowable current deviation threshold. When the link current difference is greater than the allowable current deviation threshold, the corresponding link segment is identified as a candidate segment for current anomaly; when the link current difference is not greater than the allowable current deviation threshold, the corresponding link segment is not considered a candidate segment for current anomaly in the current running time slice and proceeds to step S4. The candidate segment for current anomaly serves as input for subsequent cross-diagnostics, used to limit the processing range of link voltage drop, pile body temperature rise, and alarm code combination comparison. Based on the above data calculation results, since the calculated link current difference (11A) is clearly greater than the allowable current deviation threshold (9.25A), and this difference exceeds the normal temperature drift range, the system immediately identifies the corresponding link segment as a candidate segment for current anomaly and sends it to subsequent steps.

[0046] S4, calculate the voltage drop of the link between the upper and lower levels of the candidate current anomaly segment, and obtain the pile body temperature rise by measuring the temperature difference between adjacent time slices, and determine the fault boundary.

[0047] In S4, the execution entity only performs cross-diagnosis on the current anomaly candidate segments output from S3. For each current anomaly candidate segment, the voltage of the upper-level node and the voltage of the lower-level node within the same operating time slice are first obtained. Then, based on the power supply and receiving node directions in the in-station link segment table, the voltage drop of the upper-level node relative to the lower-level node voltage is calculated to obtain the link voltage drop. Simultaneously, the pile temperature of the charging pile corresponding to the current anomaly candidate segment in adjacent operating time slices is obtained, and the temperature increase of the pile temperature in the later operating time slice relative to the previous operating time slice is calculated to obtain the pile temperature rise.

[0048] S411: Obtain the voltage of the upstream node and the voltage of the downstream node within the same runtime time slice for the candidate current anomaly segment. Both the upstream and downstream node voltages are derived from the runtime messages recorded for the corresponding link segment and correspond to the current runtime time slice. If either the upstream or downstream node voltage is missing, link voltage drop determination is not performed to avoid forming fault boundaries with incomplete voltage fields.

[0049] S412, based on the power supply and receiving node directions in the intra-station link segment table, calculate the voltage drop of the upstream node relative to the downstream node voltage to obtain the link voltage drop. The link voltage drop and the allowable voltage drop threshold belong to the same link segment for judgment; the comparison between the two is used to identify the voltage drop status of the link segment during electrical transmission. For example, in the link identified as a candidate segment for current anomaly, the system extracts the current upstream distribution cabinet node voltage as 395.2V and the downstream charging pile incoming line node voltage as 379.8V from the home message, calculating the current link voltage drop to be 15.4V.

[0050] S413: Obtain the pile temperature of the charging pile corresponding to the current anomaly candidate segment within the adjacent operating time slot, calculate the temperature increase of the pile body temperature in the later operating time slot relative to the pile body temperature in the previous operating time slot, and obtain the pile body temperature rise. The determination of adjacent operating time slots is based on the alignment message time and slot width range. If the corresponding pile body temperature is missing in the previous or subsequent operating time slot, the pile body temperature rise will not be generated based on this incomplete temperature sequence.

[0051] S414 combines and compares the link voltage drop, pile temperature rise, allowable voltage drop threshold, allowable temperature rise threshold, and alarm code. When the link voltage drop is greater than the allowable voltage drop threshold and the pile temperature rise is less than the allowable temperature rise threshold, the fault boundary is determined to be cable aging. This judgment path uses the current abnormality candidate segment as the pre-input, uses the link voltage drop exceeding the allowable voltage drop threshold as the judgment condition for electrical transmission abnormality, and uses the pile temperature rise not exceeding the allowable temperature rise threshold as the boundary distinction condition. Continuing with the above voltage drop data, the preset allowable voltage drop threshold for this link is 12.0V. At this time, the link voltage drop (15.4V) is significantly greater than the allowable voltage drop threshold. At the same time, the system retrieves the average pile temperature data in adjacent operating time slices at 1-minute intervals. The previous time slice is 43.1℃ and the next time slice is 44.3℃. The calculated pile temperature rise is only 1.2℃ / min, which is far lower than the preset allowable temperature rise threshold (2.5℃ / min). This combination of high voltage drop and low terminal heating indicates that the additional energy loss and impedance increase are evenly distributed along the line rather than concentrated at the endpoints, thus allowing the system to accurately determine the fault boundary as cable aging.

[0052] S415: When the link voltage drop is not greater than the allowable voltage drop threshold and the pile temperature rise is greater than the allowable temperature rise threshold, accompanied by an alarm code, the fault boundary is determined to be poor node contact. This determination path uses the pile temperature rise exceeding the allowable temperature rise threshold and the presence of an alarm code as combined conditions, and uses the link voltage drop not exceeding the allowable voltage drop threshold as a condition to distinguish it from the cable aging boundary. If the link voltage drop, pile temperature rise, and alarm code do not meet any of the above combined conditions, the corresponding current abnormality candidate segment can remain in an undefined boundary state, and no branch disconnection command or power reduction charging pile control command will be directly output.

[0053] S5 generates instructions based on fault boundaries. When it is determined that the cable is aging, a branch disconnection instruction is generated. When it is determined that the node has poor contact, a charging pile control instruction with reduced power is generated first.

[0054] In S5, the executing entity uses the fault boundary obtained in S4 as input, and determines the control object by combining the current anomaly candidate segment, link segment, and switch status. For cable aging boundaries, the control object is the target branch switch; for poor node contact boundaries, the control object is the target charging pile. Both the target branch switch and the target charging pile are determined based on the power supply and receiving node relationship in the in-station link segment table and written into the control object record.

[0055] S511: Obtain the candidate current anomaly segment, link segment, and switch status corresponding to the fault boundary. Determine the target branch switch and target charging pile based on the power supply and receiving node relationship in the link segment table within the station. The target branch switch corresponds to the branch switch object where the abnormal link segment is located, and the target charging pile corresponds to the charging pile object to which the lower-level side or related node of the abnormal link segment belongs. The control object record is used to store the correspondence between the fault boundary, target branch switch, target charging pile, and switch status.

[0056] S512: When the fault boundary is cable aging and the switch is in the closed state, a branch disconnect command carrying the target branch switch is generated. The output object of the branch disconnect command is the target branch switch, and the command is entered into the control command set after generation. If the switch is not in the closed state, the disconnect control output of the same branch will not be generated repeatedly to avoid inconsistency between the controlled object record and the actual switch state.

[0057] S513: When the fault boundary is poor node contact, acquire the interface current, rated current upper limit, pile body temperature rise, and alarm code corresponding to the target charging pile. Determine the power reduction level based on the degree to which the pile body temperature rise exceeds the allowable temperature rise threshold. If the alarm code matches the contact-related alarm code table, increase the power reduction level. The power reduction level is used to determine the extent of reduction in the allowable output current of the target charging pile, and its input sources include the pile body temperature rise, the allowable temperature rise threshold, and the alarm code match status.

[0058] S514: Based on the power reduction level, the allowable output current of the target charging pile is reduced to obtain the reduced allowable output current, and the reduced allowable output current is compared with the preset minimum holding current. When the reduced allowable output current is not lower than the preset minimum holding current, a power reduction charging pile control command is generated. This command carries the target charging pile and the reduced allowable output current and enters the control command set. When the reduced allowable output current is lower than the preset minimum holding current, the power reduction control result for maintaining output is not generated based on the reduced allowable output current, so as to avoid the control output falling below the holding boundary supported by the application materials.

[0059] The power reduction flexible control strategy based on this feedback adjustment process adopts the following industrial control thermal response degradation formula: ; in, This represents the reduced allowable output current command value generated; This represents the preset minimum holding current set to prevent the charging process from being completely interrupted; This represents the original rated current limit of the target charging station; This represents the derating ratio coefficient (unit: A / (℃ / min)) mapped from the power reduction level. When the detected alarm code matches the contact alarm code table, this coefficient will be dynamically increased to implement a more severe punitive derating. This represents the temperature rise of the pile body calculated from the current actual measurements. This represents the allowable temperature rise threshold configured within the station; The function compares the reduced allowable output current with the preset minimum holding current and clamps it accordingly.

[0060] For example, the upper limit of the rated current for a target charging station. 250A, permissible temperature rise threshold The set temperature is 2.5℃ / min, with a preset minimum holding current. It is 80A.

[0061] When the system detects the temperature rise of the pile body at this time When the temperature suddenly increased to 4.5℃ / min, it exceeded the limit by 2.0℃ / min. Simultaneously, because the operation message carried the connector temperature warning alarm code "ERR-012" and matched the contact alarm code table, the system immediately adjusted the derating ratio. The penalty is increased from 15A / (℃ / min) under the standard strategy to 40A / (℃ / min) at the lower penalty level. Substituting into the downgrade formula, the calculation is as follows: The current reduction required is ; The theoretical value of the reduced allowable output current is ; The output is 170A, which is not lower than the set minimum maintenance boundary of 80A. Based on this, the system can legally generate a power reduction control command with a limited output of 170A.

[0062] S515 outputs a control command set. This set includes at least branch disconnection commands for cable aging boundaries, or power reduction commands for charging piles due to poor node contact boundaries. The receiving object of the control command set is the control object corresponding to the target branch switch or the target charging pile. After output, the control object's response to the corresponding control commands can be observed through the switch status, the target charging pile's allowed output current status, and the interface current, pile temperature, and alarm code status in subsequent operation messages. These observations do not introduce additional experimental data and are only used to illustrate the verifiable engineering status after command output.

[0063] Through the above steps S1 to S5, this embodiment forms a continuous processing chain from the input of the in-station link segment table and operation message, to the allocation of operation time slices, generation of hierarchical operation status, determination of current anomaly candidate segments, fault boundary judgment, and output of control command sets. Link segment identifiers are used to unify message allocation and link segment boundaries; operation time slices are used to unify the time base of multi-source messages; the current deviation threshold is dynamically generated according to ambient temperature and the upper limit of rated current; link voltage drop, pile body temperature rise, and alarm codes are used to distinguish between cable aging and poor node contact within the current anomaly candidate segment range; and branch disconnection commands and power reduction charging pile control commands correspond to control outputs for different fault boundaries.

[0064] Example 2: Please refer to Figure 1 and Figure 5 This embodiment provides a remote operation and maintenance system for charging stations based on the Industrial Internet. The difference between this embodiment and Embodiment 1 is that this embodiment uses system modules as the carrier objects to implement the data acquisition, timing alignment, state classification, current anomaly screening, cross-diagnosis, boundary determination, and control command generation processes in the method described in Embodiment 1; its input is still the in-station link segment table and operation messages, and its output is still the branch disconnection command or the charging pile control command with reduced power.

[0065] The system in this embodiment includes a data acquisition module, a timing alignment and status classification module, a current anomaly coarse screening module, a cross-diagnosis and boundary determination module, and a flexible control command generation module. The data acquisition module acquires the in-station link segment table and operation messages. The in-station link segment table records the power supply and receiving nodes, rated current upper limit, allowable voltage drop threshold, and allowable temperature rise threshold; the operation messages carry the voltage and current of the incoming line and interface, switch status, pile temperature, alarm code, and message time. The data acquisition module receives the in-station link segment table generated from the station-level power distribution topology configuration table and receives operation messages uploaded from the incoming line metering interface, branch switch interface, and charging pile interface. The data acquisition module forms a message attribution field according to the device address and interface number, and matches the message attribution field with the link segment identifier; operation messages that match the link segment identifier are written to the corresponding link segment record, and operation messages that do not match are written to the pending verification message queue and an attribution verification result is generated.

[0066] The timing alignment and status classification module receives link message records output by the data acquisition module. This module reads the message time and reception time from consecutive messages on the same acquisition interface to determine the transmission delay. It then corrects the message time based on the delay compensation value corresponding to the acquisition interface to obtain the aligned message time. The timing alignment and status classification module groups running messages whose aligned message times fall within the same wide range into the same running time slice. Based on the power supply and receiving node relationships in the site link segment table, it maps the interface current to the distribution branch node and charging pile node respectively, generating a graded operating status. The graded operating status is output to the current anomaly coarse screening module.

[0067] The current anomaly coarse screening module receives the hierarchical operating status, obtains the metered current and the current of the lower-level nodes for each link segment, and filters the interface currents belonging to the lower-level side of the same link segment according to the power supply and receiving node relationship. This module sums the filtered interface currents to obtain the lower-level current total value, and then calculates the difference between the metered current and the lower-level current total value to obtain the link current difference. The current anomaly coarse screening module also receives ambient temperature, rated current upper limit, and a temperature range threshold table. Based on the temperature range matched by the ambient temperature, it determines the temperature correction level, reads the deviation correction ratio corresponding to the temperature correction level, and generates an allowable current deviation threshold based on the rated current upper limit, deviation correction ratio, preset basic deviation amount, and upper limit capping. When the link current difference exceeds the allowable current deviation threshold, the current anomaly coarse screening module outputs current anomaly candidate segments to the cross-diagnosis and boundary determination module.

[0068] The cross-diagnosis and boundary determination module receives candidate current anomalies and obtains the voltage of the upstream and downstream nodes of the candidate current anomaly within the same operating time slice. Based on the power supply and receiving node directions in the in-station link segment table, it calculates the link voltage drop. This module also obtains the pile temperature of the corresponding charging pile within adjacent operating time slices, calculating the pile temperature rise. The cross-diagnosis and boundary determination module combines and compares the link voltage drop, pile temperature rise, allowable voltage drop threshold, allowable temperature rise threshold, and alarm code: if the link voltage drop is greater than the allowable voltage drop threshold and the pile temperature rise is less than the allowable temperature rise threshold, the output fault boundary is cable aging; if the link voltage drop is not greater than the allowable voltage drop threshold and the pile temperature rise is greater than the allowable temperature rise threshold, accompanied by an alarm code, the output fault boundary is poor node contact. Candidate current anomalies that do not meet the boundary combination conditions do not directly trigger control command output.

[0069] The flexible control command generation module receives the fault boundary output from the cross-diagnosis and boundary determination module, and receives the corresponding current anomaly candidate segment, link segment, and switch status. This module determines the target branch switch and target charging pile based on the power supply and receiving node relationship in the in-station link segment table and writes it into the control object record. When the fault boundary is cable aging and the switch status is closed, the flexible control command generation module generates a branch disconnect command carrying the target branch switch; when the fault boundary is poor node contact, the flexible control command generation module determines the power reduction level based on the interface current, rated current upper limit, pile body temperature rise, and alarm code of the target charging pile, and increases the power reduction level when the alarm code matches the contact-type alarm code table. The flexible control command generation module reduces the allowable output current of the target charging pile according to the power reduction level, obtaining the reduced allowable output current; when the reduced allowable output current is not lower than the preset minimum holding current, a power reduction charging pile control command is generated. Thus, a module collaboration chain is formed between system modules, from operation message input, time slice status generation, anomaly candidate segment output, fault boundary determination to control command set output.

[0070] The above embodiments are used to illustrate the implementable methods of the technical solutions described in this invention. The processes, field states, processing order, judgment conditions, parameter sources, module collaboration, and correspondences of controlled objects in each embodiment should be understood based on the technical solutions and application materials described in the application documents. Without departing from the scope supported by the technical solutions and application materials described in this invention, any equivalent substitutions, equivalent modifications, equivalent combinations, order adjustments, module correspondence replacements, equivalent changes in field names, equivalent acceptance of the executing entity, or equivalent changes in the carrier form that can be conceived by those skilled in the art should fall within the protection scope of this patent; however, it may not be extended to undescribed protected subjects, nor may the substantive correspondences of the technical objects be changed through name changes.

Claims

1. A method for remote operation and maintenance of charging stations based on the Industrial Internet, characterized in that, The method includes: Obtain the in-station link segment table and operation messages. The in-station link segment table records the power supply and receiving nodes, the rated current limit, the allowable voltage drop threshold, and the allowable temperature rise threshold. The operation messages carry the voltage and current of the incoming line and interface, the switch status, the pile body temperature, the alarm code, and the message time. Based on the message time, the running message is time-delay aligned and assigned to the running time slice. The interface current is assigned to the power distribution branch and charging pile according to the in-station link segment table to generate a hierarchical operating status. For each link segment in the graded operation state, calculate the link current difference between the metered current and the lower level current, and compare it with the allowable current deviation threshold dynamically generated based on the ambient temperature to determine the candidate segment for current anomaly. The link voltage drop is obtained by calculating the voltage between the upper and lower levels of the candidate current anomaly segment, and the pile body temperature rise is obtained by calculating the temperature difference between adjacent time slots. When the link voltage drop is greater than the allowable voltage drop threshold and the pile body temperature rise is less than the allowable temperature rise threshold, the fault boundary is determined to be cable aging. When the link voltage drop is not greater than the allowable voltage drop threshold and the pile body temperature rise is greater than the allowable temperature rise threshold and is accompanied by the alarm code, the fault boundary is determined to be poor node contact. Based on the fault boundary generation instructions, when it is determined that the cable is aging, a branch disconnection instruction is generated; when it is determined that the node has poor contact, a charging pile control instruction with reduced power is generated first.

2. The method according to claim 1, characterized in that, The steps for obtaining the intra-site link segment table and the running message include: Obtain the intra-station link segment table generated from the station-level power distribution topology configuration table, parse the corresponding records between the power supply and receiving nodes, the rated current upper limit, the allowable voltage drop threshold and the allowable temperature rise threshold in the intra-station link segment table, and establish link segment identifiers according to the connection direction between the power supply side node and the power receiving side node in the power supply and receiving nodes; The operation messages uploaded by the incoming metering interface, branch switch interface and charging pile interface are obtained. Based on the link segment identifier, the voltage, current, switch status, pile temperature, alarm code and message time in the operation messages are written into the corresponding link segment record to generate a link message record.

3. The method according to claim 2, characterized in that, The process of generating the link message record includes: Read the device address, interface number, and message time from the running message; use the device address and interface number together as the message attribution field; and match the message attribution field with the link segment identifier. When the message attribution field matches the link segment identifier, the incoming line voltage, incoming line current, interface voltage, interface current, switch status, pile temperature, and alarm code are written into the same link segment record. When the message attribution field does not match the link segment identifier, the running message is written into the message queue to be verified, and an attribution verification result is generated.

4. The method according to claim 1, characterized in that, The steps for generating the hierarchical operating status include: Obtain the message time and reception time of the same acquisition interface in consecutive messages, calculate the transmission delay of the message time relative to the reception time, and correct the message time according to the delay compensation value corresponding to the acquisition interface to obtain the aligned message time; The running messages whose time falls within the same wide range are grouped into the same running time slice, and the interface current is mapped to the power distribution branch node and the charging pile node respectively according to the power supply and receiving node relationship in the in-station link segment table to generate the hierarchical operation status.

5. The method according to claim 1, characterized in that, The steps for determining the candidate segments of the current anomaly include: The metering current and the lower-level node current of each link segment within the same running time slice are obtained. The interface currents belonging to the lower level side of the same link segment are filtered according to the power supply and receiving node relationship in the in-station link segment table. The filtered interface currents are summed to obtain the total value of the lower-level current. The difference between the metered current and the total value of the lower-level current is calculated to obtain the link current difference. The ambient temperature is obtained and the corresponding allowable current deviation threshold is called according to the temperature range to which the ambient temperature belongs. When the link current difference is greater than the allowable current deviation threshold, the corresponding link segment is determined as the current abnormality candidate segment.

6. The method according to claim 5, characterized in that, The dynamic generation process of the allowable current deviation threshold includes: Obtain the rated current upper limit, ambient temperature and temperature range threshold table corresponding to the link segment, determine the temperature correction level based on the temperature range hit by the ambient temperature, and read the deviation correction ratio corresponding to the temperature correction level; The temperature correction deviation is calculated by multiplying the upper limit of the rated current by the deviation correction ratio. The temperature correction deviation is then superimposed with the preset basic deviation, and the superposition result is subjected to upper limit capping to generate the allowable current deviation threshold.

7. The method according to claim 1, characterized in that, The steps of calculating the voltage drop across the link between the candidate current anomaly segments, obtaining the link voltage drop, and determining the temperature rise of the pile body by calculating the temperature difference between adjacent time slices, and determining the fault boundary, include: The voltage of the upstream node and the voltage of the downstream node within the same running time slice of the current anomaly candidate segment are obtained. Based on the power supply and receiving node direction in the in-station link segment table, the voltage drop of the upstream node relative to the voltage of the downstream node is calculated to obtain the link voltage drop. The charging pile temperature corresponding to the candidate current anomaly segment is obtained in adjacent operating time slots. The temperature increase of the charging pile temperature in the later operating time slot relative to the temperature of the charging pile in the previous operating time slot is calculated to obtain the charging pile temperature rise. The link voltage drop, the charging pile temperature rise, the allowable voltage drop threshold, the allowable temperature rise threshold and the alarm code are combined and compared to determine the fault boundary.

8. The method according to claim 1, characterized in that, The steps for generating instructions based on the fault boundary include: Obtain the current anomaly candidate segment, link segment and switch status corresponding to the fault boundary, determine the target branch switch and target charging pile according to the power supply and receiving node relationship in the in-station link segment table, and write the target branch switch and target charging pile into the control object record; When the fault boundary is that the cable is aging and the switch is in a closed state, a branch disconnection command carrying the target branch switch is generated. When the fault boundary is that the node has poor contact, a charging pile control command carrying the power reduction of the target charging pile is generated, and a control command set is output.

9. The method according to claim 8, characterized in that, The process of generating the reduced-power charging pile control command includes: The interface current, the upper limit of the rated current, the temperature rise of the pile body and the alarm code corresponding to the target charging pile are obtained. The power reduction level is determined according to the degree to which the temperature rise of the pile body exceeds the allowable temperature rise threshold. The power reduction level is increased when the alarm code hits the contact alarm code table. The allowable output current of the target charging pile is reduced according to the power reduction level to obtain the reduced allowable output current. The reduced allowable output current is then compared with a preset minimum sustaining current. When the reduced allowable output current is not lower than the preset minimum sustaining current, the charging pile control command for power reduction is generated.

10. The method according to claim 1, characterized in that, The system is used to implement the method according to any one of claims 1-9, comprising: The data acquisition module acquires the in-station link segment table and operation messages. The in-station link segment table records the power supply and receiving nodes, the rated current limit, the allowable voltage drop threshold, and the allowable temperature rise threshold. The operation messages carry the voltage and current of the incoming line and interface, the switch status, the pile body temperature, the alarm code, and the message time. The timing alignment and status classification module performs time delay alignment on the running message based on the message time and classifies it into the running time slice. It assigns the interface current to the power distribution branch and charging pile according to the in-station link segment table and generates a hierarchical operating status. The current anomaly screening module calculates the link current difference between the metered current and the lower-level current for each link segment in the graded operation state, and compares it with the allowable current deviation threshold dynamically generated based on the ambient temperature to determine the candidate current anomaly segment. The cross-diagnosis and boundary determination module calculates the link voltage drop and the temperature difference between adjacent time slots to obtain the pile body temperature rise of the upstream and downstream voltages of the candidate current anomaly segment. When the link voltage drop is greater than the allowable voltage drop threshold and the pile body temperature rise is lower than the allowable temperature rise threshold, the fault boundary is determined to be cable aging. When the link voltage drop is not greater than the allowable voltage drop threshold and the pile body temperature rise is greater than the allowable temperature rise threshold and is accompanied by the alarm code, the fault boundary is determined to be poor node contact. The flexible control command generation module generates commands based on the fault boundaries. When the cable is determined to be aging, a branch disconnection command is generated. When the node has poor contact, a power reduction charging pile control command is generated first.

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