Method for studying, judging and verifying power failure and power recovery of low-voltage transformer area

Abstract

The invention relates to the technical field of power failure first-aid repair, in particular to a research, judgment and verification method for power failure and power recovery of a low-voltage transformer area. The research and judgment method provided by the invention is applied to repair of power failure and power recovery of the HPLC low-voltage transformer area, and comprises the following steps: research and judgment of power failure of the low-voltage transformer area and research and judgment of power recovery of the low-voltage transformer area. The verification method provided by the invention passes through transformer area and ammeter cross verification, and comprises the following steps: verification of power failure of a low-voltage transformer area and verification of power restoration of the low-voltage transformer area. Different electric energy meter rated voltages and judgment thresholds are set, and the power failure state is accurately judged through the interrogation voltage; power failure and power recovery are confirmed from local and overall multiple dimensions by utilizing cross validation of a transformer area and an electric meter, and misjudgment is reduced; after the power failure condition is accurately judged, accurate information is provided for first-aid repair personnel in time, and the on-site investigation time is shortened; a delay reporting mechanism is set, information interference is avoided, accurate judgment is ensured, and first-aid repair resources are reasonably allocated; an original passive mode is changed into an active mode, and power failure and power recovery conditions are actively researched and judged.

Description

Technical Field

[0001] This invention relates to the field of power outage repair technology, specifically to a method for judging and verifying power outages and power restoration in low-voltage distribution areas. Background Technology

[0002] In the area of ​​low-voltage distribution area power outage and restoration emergency repair, existing assessment and verification methods have significant shortcomings. Taking the low-voltage power grid emergency repair and maintenance management method and system combining real-time power outage and restoration information, provided in Chinese Patent Publication No. CN113793232A, as an example, traditional methods lack precise criteria for judging power outage status, relying heavily on single indicators or simple rules, making it difficult to distinguish between genuine power outages and abnormal data interference, leading to frequent misjudgments. For instance, in judging power meter outages, the lack of reasonable threshold values ​​for different rated voltages means that the measured voltage results cannot accurately reflect the power outage status, affecting emergency repair decisions.

[0003] In terms of overall assessment, the lack of multi-dimensional verification from the local to the overall situation makes it difficult to fully and accurately confirm the power outage and restoration status based on a single device or partial data, which can easily lead to improper allocation of emergency repair resources. Moreover, the traditional method of passively waiting for information to be reported cannot proactively assess the situation, resulting in time-consuming on-site investigations and low emergency repair efficiency. At the same time, the lack of effective delayed reporting and deduplication rules in information processing leads to duplicate and invalid information interfering with the judgment, reducing the accuracy and timeliness of the assessment, and causing inconvenience to the emergency repair work. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for judging and verifying the restoration of power outages in low-voltage distribution areas.

[0005] The technical solution adopted in this invention is as follows: A method for assessing the restoration of power after a power outage in a low-pressure HPLC system, applied to emergency repairs of power outages in low-pressure HPLC systems, includes the following steps: S1. Low-voltage transformer area power outage assessment, including: S11. The main station receives the terminal's proactive reporting, which is divided into the following situations: Scenario 1: For a single terminal in a specific area, the main station receives a power outage event proactively reported by the terminal. Scenario 2: For a single area with multiple terminals, the main station simultaneously receives terminal power outage events actively reported by multiple terminals under the area, and performs data sampling and measurement of the A-phase voltage of some energy meters under the terminals that have not reported terminal power outage events, and makes a power outage judgment based on the sampling results; S12. For power outage events reported multiple times by the terminal within 1 hour, the master station only processes the first reported power outage event. S13. The main station determines whether there is a marketing process in progress on the terminal on the same day. If so, the power outage event of the terminal is discarded. S14. The master station determines whether the time of the terminal power outage event is valid. If it is invalid, the event is discarded. S15. The main station calls for the A-phase voltage of the terminal or the A-phase voltage of the main meter, and makes a preliminary determination of the power outage based on the call results. S16. The main station delays reporting for 2 minutes, waits for the terminal power-on event, and continues the process based on the waiting result. S17. For HPLC low-pressure stations, simultaneously verify whether there is a power outage event of electricity meters, and combine the power outage events of terminals and electricity meters to determine the power outage of the station: if the terminal determines that there is a power outage, and several electricity meters under all corresponding terminals in the station also determine that there is a power outage, then the master station determines that the station is in power outage. The master station encapsulates the power outage event information of the terminal, saves the power outage event information to the database, and pushes it to the external system. S2, Low-voltage distribution area power restoration assessment, including: S21. When the main station marks the power outage unit and the corresponding substation-level terminal reports a power-back event, and the power restoration time is valid, the substation is deemed to have been restored. S22. Based on the archives, determine whether there are distributed photovoltaic systems under the transformer area, and make a power restoration assessment accordingly; S23. If the power restoration time is invalid and no other power outage events have been reported, the voltage of phase A of the main meter in the distribution area shall be measured to determine the power restoration status. S24. If the transformer substations of the transformer substation marked as having a power outage do not report a power restoration event, but the electricity meter and smart metering switch report a valid power restoration event, the transformer substation is deemed to have been restored. S25. If no power restoration alarm event is reported by the substation-level terminals and meters of the substation marked as a power outage unit by the main station, but the number of users reporting load in the substation exceeds 30%, the substation is judged to be restored: the power restoration event information and the closing status of the switch and inverter after the power meter are saved to the database and pushed to the external system.

[0006] This technical solution constructs a multi-dimensional, multi-layered information interaction and logical judgment mechanism to achieve accurate assessment of power outages and restorations in low-voltage distribution areas. This enables more efficient guidance for power outage and restoration repairs in low-voltage distribution areas, improving repair efficiency and quality, and reducing delays and resource waste caused by inaccurate power outage and restoration assessments. Specifically, in terms of power outage assessment, it first receives information proactively reported by terminals, adopting different processing methods for different terminal configurations. For example, if one terminal in one distribution area directly receives the report, while if multiple terminals in one distribution area have data from the unreported terminals' electricity meters, it conducts data sampling to assist in the assessment. Simultaneously, it deduplicates multiple reported power outage events, judging whether the terminal has a marketing process in progress and whether the power outage event time is valid to filter valid information. It also conducts preliminary identification by sampling the voltage of the terminal or the main meter's A phase, delaying the reporting and waiting for the terminal to power up. For HPLC low-voltage distribution areas, it simultaneously verifies the electricity meter power outage event, comprehensively assesses the power outage situation of the distribution area based on the terminal and electricity meter power outage information, and finally encapsulates and saves the power outage event information to the database and pushes it to external systems. In terms of power restoration assessment, the system comprehensively judges the power restoration status of the transformer substation based on various conditions, including the validity of power restoration events reported by the substation-level terminals and the time of power restoration, the status of distributed photovoltaic systems in the archives, the voltage of phase A of the main meter of the transformer substation, the valid power restoration events reported by the electricity meters and smart meter switches, and the proportion of users reporting power restoration events from the load of the transformer substation. The system also saves the power restoration event information and the closing status of related equipment to the database and pushes them to external systems.

[0007] In addition, the method for judging the power outage and restoration of low-voltage distribution areas proposed above according to the present invention also allows for the following additional technical features: According to one embodiment of the present invention, in case two of S11, the rated voltage of the lower part of the terminal energy meter is 220V and the judgment threshold is set to 132V, the rated voltage of the energy meter is 100V and the judgment threshold is set to 60V; the recall result is divided into two types: no return value or voltage value is 0V, or return value is greater than 0V and less than 132V.

[0008] This technical solution determines the power outage status of equipment based on the measured voltage by setting the rated voltage and judgment threshold of different energy meters. This avoids misjudgments caused by a single judgment standard and significantly improves the accuracy of power outage assessment in low-voltage distribution areas. After accurately determining the power outage situation, it can provide timely and accurate information to repair personnel, reducing unnecessary on-site investigation time and thus improving the efficiency of power outage repair in low-voltage distribution areas. It also avoids the waste of repair resources caused by misjudgments, rationally allocates human and material resources, makes repair work more efficient and orderly, and reduces repair costs.

[0009] According to one embodiment of the present invention, during the 2-minute delay period of the master station reporting in S16, only power-on events reported by the same terminal are judged. If a power-on event of any identical terminal under the same station area is received, the corresponding terminal power-off event is discarded.

[0010] This technical solution sets up a 2-minute delay reporting mechanism. During this period, the main station focuses on processing power-on events reported by the same terminal, avoiding interference from a large number of different terminal power-on event information in a short period of time. Through this specific time window and filtering rules, the judgment of terminal power-off events is more accurate, reducing misjudgments.

[0011] According to an embodiment of the present invention, in the synchronous verification of whether there is a power outage event of the electricity meter in S17, the power outage judgment includes: calling the voltage of phase A of the electricity meter. If the call result has no return value or the voltage value is 0V, or the return value is greater than 0V and less than 132V, then the electricity meter is determined to be out of power.

[0012] In this technical solution, the electricity meter is a key device for measuring electricity consumption data. Its normal operation affects electricity billing, electricity consumption analysis, etc. By synchronously verifying the electricity meter's power outage event, the voltage of phase A is measured, and different voltage conditions are used as the basis for judgment. No return value indicates a communication failure or the electricity meter is shut down. A voltage of 0V directly indicates no power, while a voltage value between 0V and 132V means that it is in an abnormally low voltage state. Based on the above, it is possible to accurately determine whether the electricity meter is out of power.

[0013] According to one embodiment of the present invention, the distributed photovoltaic system in S22 is divided into the following cases: Scenario 1: If the power generation current of the distributed photovoltaic system is greater than or equal to 0.1A, then the multi-function switch is considered to have been successfully restored to power. Scenario 2: If the power generation current of the distributed photovoltaic is less than 0.1A, it will be compared with the standard distributed photovoltaic power generation efficiency. If the power generation efficiency of the household is 10% lower than that of the standard comparison household, it will be determined that the multi-function switch after the table failed to close, or the customer failed to close the simulated islanding switch, or the undervoltage disconnect switch was activated without manual closing.

[0014] In this technical solution, the power generation current is an important indicator reflecting the working status of the distributed photovoltaic power generation system during operation. When the power generation current reaches a certain threshold (≥0.1A), it indicates that the system has sufficient current output, and the power restoration can be preliminarily determined to be successful. When the power generation current is too small (<0.1A), by comparing it with the standard power generation efficiency, it is possible to analyze whether there are problems such as switch closing failure, simulated islanding closing failure, or undervoltage disconnection switch action without manual closing, so as to achieve accurate assessment of the operating status of the distributed photovoltaic system.

[0015] According to an embodiment of the present invention, in S1 and S2, the judgment method further includes a deduplication rule: if the main station receives a terminal power-on event, an energy meter power-on event, reported data collection data or energy data within 5 minutes, it performs corresponding deduplication processing.

[0016] This technical solution uses a 5-minute time window to deduplicat specific data received by the main station, ensuring data accuracy and uniqueness. This allows for more precise analysis of the power system and avoids misjudgments caused by duplicate data.

[0017] To achieve the above objectives, the present invention also provides a verification method for power restoration in low-voltage distribution areas after a power outage.

[0018] A verification method for power restoration in a low-voltage distribution area after a power outage, through cross-verification of the distribution area and the electricity meter, includes the following steps: S3. Verification of Low-Voltage Distribution Area Power Outage: Through cross-verification of power outage events, after the main station receives the power outage event reported by the terminal, it simultaneously triggers the following verification: For terminals that have not reported a power outage event, the A-phase voltage of their associated meters is measured. If the measurement result has no return value or the voltage value is 0V, or the return value is greater than 0V and less than 132V, the power outage of the meter is confirmed to be valid; if all terminals associated with the meters in the distribution area are out of power, the power outage event of the distribution area is confirmed to be valid. S4. Verification of Low-Voltage Distribution Area Power Restoration: Through cross-verification of meter power restoration events, after the main station receives the distribution area power restoration event reported by the terminal, it synchronously triggers the following verification: If the terminal power restoration time is valid, and the A-phase voltage of all meters under the distribution area is tested, if the test result has no return value or the voltage value is 0V, or the return value is greater than 0V and less than 132V, then the meter power restoration is confirmed to be valid; if ≥80% of the meters under the distribution area are restored and the load is restored to more than 30% of the level before the power outage, then the distribution area power restoration is confirmed to be valid.

[0019] This technical solution employs cross-verification between transformer substations and meters. After the main station receives a report of a power outage and restoration event from the terminal, it performs relevant tests and comprehensive judgments on the meters to accurately confirm the power outage and restoration status of the meters and transformer substations. Specifically, by constructing a collaborative verification system between the main station, terminals, and meters, and using the meter voltage status as the core judgment criterion, it achieves accurate verification of low-voltage transformer substation power outage and restoration events. When the main station receives a report of a transformer substation power outage event from the terminal, on the one hand, for terminals that did not report a power outage event, it tests the A-phase voltage of their associated meters. Based on the voltage having no return value, being 0V, or falling within the abnormal range of 0-132V, it confirms that the meter power outage is valid, verifying the power outage situation from the local meter status. On the other hand, when the transformer substation... When all connected meters of the substation are de-energized, the power outage event of the substation is confirmed as valid from an overall perspective. During the power restoration verification, after the main station receives the power restoration event reported by the terminal, it first determines the validity of the terminal's power restoration time, and then measures the A-phase voltage of all meters in the substation. Based on the voltage situation, the power restoration of the meters is confirmed as valid. At the same time, combined with the two conditions that ≥80% of the meters in the substation are restored to power and the load is restored to more than 30% of the level before the power outage, the power restoration of the substation is confirmed as valid from both the individual meter and overall substation perspectives to ensure the accuracy of the verification results.

[0020] According to an embodiment of the present invention, in step S3, when cross-validating the power outage event of the electricity meter, the following situations are excluded: the electricity meter repeatedly reports the power outage event within 1 hour; the time of the power outage event of the electricity meter is not on the same day or the time difference with the current time is greater than 1 hour; the electricity meter communication is interrupted but the voltage is normal.

[0021] This technical solution filters and excludes power outage events reported by electricity meters by setting a series of conditions. First, it checks whether the meter repeatedly reports a power outage event within one hour; if so, it excludes it. Next, it determines whether the power outage event occurred on the same day and the time difference from the current time is ≤1 hour; if not, it excludes the event. Finally, it checks whether the voltage is normal when the meter communication is interrupted; if normal, it excludes the event. Through these three layers of filtering, truly valid power outage events are retained, enabling the master station to determine the power outage situation in low-voltage distribution areas based on accurate data.

[0022] According to one embodiment of the present invention, in step S4, when cross-verifying the power restoration event of the electricity meter, if the terminal does not report a power restoration event, but the electricity meter or smart metering switch reports a power restoration event, then the electricity meter time shall be used as the standard; if the proportion of restored electricity meters is less than 80% or the load has not been restored, then the partial power restoration is confirmed to be effective, and the status of the remaining electricity meters needs to be checked.

[0023] This technical solution uses meter readings as the standard to avoid misjudgments of power restoration time due to terminals not reporting. Based on the power restoration ratio and load stratification, it accurately identifies partial power restoration and improves the overall accuracy of the assessment. When the power restoration ratio is less than 80% or the load has not been restored, the partial power restoration is confirmed as effective, and the status of the remaining meters is checked. By stratifying the power restoration event from two dimensions—the overall power restoration ratio and the load recovery status—it can accurately grasp the overall power restoration situation and promptly identify partial power restoration problems.

[0024] According to one embodiment of the present invention, S4 further allows for verification of distributed photovoltaic power restoration by detecting the power generation current of the associated distributed photovoltaic meter: if the current is ≥0.1A, the switch after the meter is confirmed to be successfully closed; if the current is <0.1A and the power generation efficiency is 10% lower than the standard, the closing is determined to be a failure and an alarm is generated.

[0025] This technical solution verifies the power generation by measuring the current of the electricity meter connected to the distributed photovoltaic system. First, a condition of current ≥ 0.1A is set. If this condition is met, the switch after the meter is confirmed to have closed successfully, as the presence of current indicates that the photovoltaic power generation system is normally connected to the circuit. If the current < 0.1A, the power generation efficiency is further checked to see if it is 10% lower than the standard. If this condition is met, the switch is considered to have failed to close and an alarm is generated. By using power generation efficiency as an auxiliary indicator, the failure to close can be identified more accurately, avoiding misjudgments due to accidental factors, thus achieving accurate verification of the distributed photovoltaic power restoration status.

[0026] Compared with the prior art, the present invention has the following advantages: (1) Improve the accuracy of judgment: Set different rated voltages and judgment thresholds for different electricity meters, and accurately judge the power outage status by calling the voltage; use cross-verification of transformer areas and electricity meters to confirm the power outage and restoration from multiple dimensions, both local and overall, to reduce misjudgment; (2) Improve emergency repair efficiency: After accurately judging the power outage situation, provide accurate information to the emergency repair personnel in a timely manner to reduce the time for on-site investigation; set up a delayed reporting mechanism to avoid information interference, ensure accurate judgment, and rationally allocate emergency repair resources; (3) Enhance service quality and efficiency: Change the original passive mode to an active mode, actively assess the power outage and restoration situation; verify the power restoration of distributed photovoltaic power, accurately assess its operating status, ensure users' electricity supply, and improve user satisfaction. Attached Figure Description

[0027] Figure 1 This is a flowchart illustrating the principle of the present invention.

[0028] Figure 2 This is a flowchart illustrating the power outage assessment method of this invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1 like Figure 1 As shown, this embodiment provides a method for assessing the restoration of power after a power outage in a low-pressure HPLC system, applicable to emergency repairs of power outages in low-pressure HPLC systems. The method includes the following steps: S1, Low-voltage distribution area power outage assessment, such as Figure 2 As shown, it includes: S11. The main station receives the terminal's proactive reporting, which is divided into the following situations: Scenario 1: For a single terminal in a specific area, the main station receives a power outage event proactively reported by the terminal. Scenario 2: For a single area with multiple terminals, the main station simultaneously receives terminal power outage events actively reported by multiple terminals under the area, and performs data sampling and measurement of the A-phase voltage of some energy meters under the terminals that have not reported terminal power outage events, and makes a power outage judgment based on the sampling results; S12. For power outage events reported multiple times by the terminal within 1 hour, the master station only processes the first reported power outage event. S13. The main station determines whether there is a marketing process in progress on the terminal on the same day. If so, the power outage event of the terminal is discarded. S14. The master station determines whether the time of the terminal power outage event is valid. If it is invalid, the event is discarded. S15. The main station calls for the A-phase voltage of the terminal or the A-phase voltage of the main meter, and makes a preliminary determination of the power outage based on the call results. S16. The main station delays reporting for 2 minutes, waits for the terminal power-on event, and continues the process based on the waiting result. S17. For HPLC low-pressure stations, simultaneously verify whether there is a power outage event of electricity meters, and combine the power outage events of terminals and electricity meters to determine the power outage of the station: if the terminal determines that there is a power outage, and several electricity meters under all corresponding terminals in the station also determine that there is a power outage, then the master station determines that the station is in power outage. The master station encapsulates the power outage event information of the terminal, saves the power outage event information to the database, and pushes it to the external system. S2, Low-voltage distribution area power restoration assessment, including: S21. When the main station marks the power outage unit and the corresponding substation-level terminal reports a power-back event, and the power restoration time is valid, the substation is deemed to have been restored. S22. Based on the archives, determine whether there are distributed photovoltaic systems under the transformer area, and make a power restoration assessment accordingly; S23. If the power restoration time is invalid and no other power outage events have been reported, the voltage of phase A of the main meter in the distribution area shall be measured to determine the power restoration status. S24. If the transformer substations of the transformer substation marked as having a power outage do not report a power restoration event, but the electricity meter and smart metering switch report a valid power restoration event, the transformer substation is deemed to have been restored. S25. If no power restoration alarm event is reported by the substation-level terminals and meters of the substation marked as a power outage unit by the main station, but the number of users reporting load in the substation exceeds 30%, the substation is judged to be restored: the power restoration event information and the closing status of the switch and inverter after the power meter are saved to the database and pushed to the external system.

[0031] This technical solution constructs a multi-dimensional, multi-layered information interaction and logical judgment mechanism to achieve accurate assessment of power outages and restorations in low-voltage distribution areas. This enables more efficient guidance for power outage and restoration repairs in low-voltage distribution areas, improving repair efficiency and quality, and reducing delays and resource waste caused by inaccurate power outage and restoration assessments. Specifically, in terms of power outage assessment, it first receives information proactively reported by terminals, adopting different processing methods for different terminal configurations. For example, if one terminal in one distribution area directly receives the report, while if multiple terminals in one distribution area have data from the unreported terminals' electricity meters, it conducts data sampling to assist in the assessment. Simultaneously, it deduplicates multiple reported power outage events, judging whether the terminal has a marketing process in progress and whether the power outage event time is valid to filter valid information. It also conducts preliminary identification by sampling the voltage of the terminal or the main meter's A phase, delaying the reporting and waiting for the terminal to power up. For HPLC low-voltage distribution areas, it simultaneously verifies the electricity meter power outage event, comprehensively assesses the power outage situation of the distribution area based on the terminal and electricity meter power outage information, and finally encapsulates and saves the power outage event information to the database and pushes it to external systems. In terms of power restoration assessment, the system comprehensively judges the power restoration status of the transformer substation based on various conditions, including the validity of power restoration events reported by the substation-level terminals and the time of power restoration, the status of distributed photovoltaic systems in the archives, the voltage of phase A of the main meter of the transformer substation, the valid power restoration events reported by the electricity meters and smart meter switches, and the proportion of users reporting power restoration events from the load of the transformer substation. The system also saves the power restoration event information and the closing status of related equipment to the database and pushes them to external systems.

[0032] In addition, the method for judging the power outage and restoration of low-voltage distribution areas proposed above according to the present invention also allows for the following additional technical features: According to one embodiment of the present invention, in case two of S11, the rated voltage of the lower part of the terminal energy meter is 220V and the judgment threshold is set to 132V, the rated voltage of the energy meter is 100V and the judgment threshold is set to 60V; the recall result is divided into two types: no return value or voltage value is 0V, or return value is greater than 0V and less than 132V.

[0033] This technical solution determines the power outage status of equipment based on the measured voltage by setting the rated voltage and judgment threshold of different energy meters. This avoids misjudgments caused by a single judgment standard and significantly improves the accuracy of power outage assessment in low-voltage distribution areas. After accurately determining the power outage situation, it can provide timely and accurate information to repair personnel, reducing unnecessary on-site investigation time and thus improving the efficiency of power outage repair in low-voltage distribution areas. It also avoids the waste of repair resources caused by misjudgments, rationally allocates human and material resources, makes repair work more efficient and orderly, and reduces repair costs.

[0034] According to one embodiment of the present invention, during the 2-minute delay period of the master station reporting in S16, only power-on events reported by the same terminal are judged. If a power-on event of any identical terminal under the same station area is received, the corresponding terminal power-off event is discarded.

[0035] This technical solution sets up a 2-minute delay reporting mechanism. During this period, the main station focuses on processing power-on events reported by the same terminal, avoiding interference from a large number of different terminal power-on event information in a short period of time. Through this specific time window and filtering rules, the judgment of terminal power-off events is more accurate, reducing misjudgments.

[0036] According to an embodiment of the present invention, in the synchronous verification of whether there is a power outage event of the electricity meter in S17, the power outage judgment includes: calling the voltage of phase A of the electricity meter. If the call result has no return value or the voltage value is 0V, or the return value is greater than 0V and less than 132V, then the electricity meter is determined to be out of power.

[0037] In this technical solution, the electricity meter is a key device for measuring electricity consumption data. Its normal operation affects electricity billing, electricity consumption analysis, etc. By synchronously verifying the electricity meter's power outage event, the voltage of phase A is measured, and different voltage conditions are used as the basis for judgment. No return value indicates a communication failure or the electricity meter is shut down. A voltage of 0V directly indicates no power, while a voltage value between 0V and 132V means that it is in an abnormally low voltage state. Based on the above, it is possible to accurately determine whether the electricity meter is out of power.

[0038] According to one embodiment of the present invention, the distributed photovoltaic system in S22 is divided into the following cases: Scenario 1: If the power generation current of the distributed photovoltaic system is greater than or equal to 0.1A, then the multi-function switch is considered to have been successfully restored to power. Scenario 2: If the power generation current of the distributed photovoltaic is less than 0.1A, it will be compared with the standard distributed photovoltaic power generation efficiency. If the power generation efficiency of the household is 10% lower than that of the standard comparison household, it will be determined that the multi-function switch after the table failed to close, or the customer failed to close the simulated islanding switch, or the undervoltage disconnect switch was activated without manual closing.

[0039] In this technical solution, the power generation current is an important indicator reflecting the working status of the distributed photovoltaic power generation system during operation. When the power generation current reaches a certain threshold (≥0.1A), it indicates that the system has sufficient current output, and the power restoration can be preliminarily determined to be successful. When the power generation current is too small (<0.1A), by comparing it with the standard power generation efficiency, it is possible to analyze whether there are problems such as switch closing failure, simulated islanding closing failure, or undervoltage disconnection switch action without manual closing, so as to achieve accurate assessment of the operating status of the distributed photovoltaic system.

[0040] According to an embodiment of the present invention, in S1 and S2, the judgment method further includes a deduplication rule: if the main station receives a terminal power-on event, an energy meter power-on event, reported data collection data or energy data within 5 minutes, it performs corresponding deduplication processing.

[0041] This technical solution uses a 5-minute time window to deduplicat specific data received by the main station, ensuring data accuracy and uniqueness. This allows for more precise analysis of the power system and avoids misjudgments caused by duplicate data.

[0042] Example 2 Based on Example 1, such as Figure 1 As shown, this embodiment provides a verification method for power restoration in a low-voltage distribution area after a power outage. The method involves cross-verification of the distribution area and the electricity meter, and includes the following steps: S3. Verification of Low-Voltage Distribution Area Power Outage: Through cross-verification of power outage events, after the main station receives the power outage event reported by the terminal, it simultaneously triggers the following verification: For terminals that have not reported a power outage event, the A-phase voltage of their associated meters is measured. If the measurement result has no return value or the voltage value is 0V, or the return value is greater than 0V and less than 132V, the power outage of the meter is confirmed to be valid; if all terminals associated with the meters in the distribution area are out of power, the power outage event of the distribution area is confirmed to be valid. S4. Verification of Low-Voltage Distribution Area Power Restoration: Through cross-verification of meter power restoration events, after the main station receives the distribution area power restoration event reported by the terminal, it synchronously triggers the following verification: If the terminal power restoration time is valid, and the A-phase voltage of all meters under the distribution area is tested, if the test result has no return value or the voltage value is 0V, or the return value is greater than 0V and less than 132V, then the meter power restoration is confirmed to be valid; if ≥80% of the meters under the distribution area are restored and the load is restored to more than 30% of the level before the power outage, then the distribution area power restoration is confirmed to be valid.

[0043] This technical solution employs cross-verification between transformer substations and meters. After the main station receives a report of a power outage and restoration event from the terminal, it performs relevant tests and comprehensive judgments on the meters to accurately confirm the power outage and restoration status of the meters and transformer substations. Specifically, by constructing a collaborative verification system between the main station, terminals, and meters, and using the meter voltage status as the core judgment criterion, it achieves accurate verification of low-voltage transformer substation power outage and restoration events. When the main station receives a report of a transformer substation power outage event from the terminal, on the one hand, for terminals that did not report a power outage event, it tests the A-phase voltage of their associated meters. Based on the voltage having no return value, being 0V, or falling within the abnormal range of 0-132V, it confirms that the meter power outage is valid, verifying the power outage situation from the local meter status. On the other hand, when the transformer substation... When all connected meters of the substation are de-energized, the power outage event of the substation is confirmed as valid from an overall perspective. During the power restoration verification, after the main station receives the power restoration event reported by the terminal, it first determines the validity of the terminal's power restoration time, and then measures the A-phase voltage of all meters in the substation. Based on the voltage situation, the power restoration of the meters is confirmed as valid. At the same time, combined with the two conditions that ≥80% of the meters in the substation are restored to power and the load is restored to more than 30% of the level before the power outage, the power restoration of the substation is confirmed as valid from both the individual meter and overall substation perspectives to ensure the accuracy of the verification results.

[0044] According to an embodiment of the present invention, in step S3, when cross-validating the power outage event of the electricity meter, the following situations are excluded: the electricity meter repeatedly reports the power outage event within 1 hour; the time of the power outage event of the electricity meter is not on the same day or the time difference with the current time is greater than 1 hour; the electricity meter communication is interrupted but the voltage is normal.

[0045] This technical solution filters and excludes power outage events reported by electricity meters by setting a series of conditions. First, it checks whether the meter repeatedly reports a power outage event within one hour; if so, it excludes it. Next, it determines whether the power outage event occurred on the same day and the time difference from the current time is ≤1 hour; if not, it excludes the event. Finally, it checks whether the voltage is normal when the meter communication is interrupted; if normal, it excludes the event. Through these three layers of filtering, truly valid power outage events are retained, enabling the master station to determine the power outage situation in low-voltage distribution areas based on accurate data.

[0046] According to one embodiment of the present invention, in step S4, when cross-verifying the power restoration event of the electricity meter, if the terminal does not report a power restoration event, but the electricity meter or smart metering switch reports a power restoration event, then the electricity meter time shall be used as the standard; if the proportion of restored electricity meters is less than 80% or the load has not been restored, then the partial power restoration is confirmed to be effective, and the status of the remaining electricity meters needs to be checked.

[0047] This technical solution uses meter readings as the standard to avoid misjudgments of power restoration time due to terminals not reporting. Based on the power restoration ratio and load stratification, it accurately identifies partial power restoration and improves the overall accuracy of the assessment. When the power restoration ratio is less than 80% or the load has not been restored, the partial power restoration is confirmed as effective, and the status of the remaining meters is checked. By stratifying the power restoration event from two dimensions—the overall power restoration ratio and the load recovery status—it can accurately grasp the overall power restoration situation and promptly identify partial power restoration problems.

[0048] According to one embodiment of the present invention, S4 further allows for verification of distributed photovoltaic power restoration by detecting the power generation current of the associated distributed photovoltaic meter: if the current is ≥0.1A, the switch after the meter is confirmed to be successfully closed; if the current is <0.1A and the power generation efficiency is 10% lower than the standard, the closing is determined to be a failure and an alarm is generated.

[0049] This technical solution verifies the power generation by measuring the current of the electricity meter connected to the distributed photovoltaic system. First, a condition of current ≥ 0.1A is set. If this condition is met, the switch after the meter is confirmed to have closed successfully, as the presence of current indicates that the photovoltaic power generation system is normally connected to the circuit. If the current < 0.1A, the power generation efficiency is further checked to see if it is 10% lower than the standard. If this condition is met, the switch is considered to have failed to close and an alarm is generated. By using power generation efficiency as an auxiliary indicator, the failure to close can be identified more accurately, avoiding misjudgments due to accidental factors, thus achieving accurate verification of the distributed photovoltaic power restoration status.

[0050] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the invention should also be covered within the protection scope of the invention. Therefore, the protection scope of the invention should be determined by the scope of the claims.

Claims

1. A low-voltage area power outage and power restoration judgment method applied to HPLC low-voltage area power outage and power restoration repair, characterized in that, Comprise the following steps: S1, low-voltage area power failure research, including: S11, the main station receives the terminal active report, divided into the following cases: Case one, for a terminal in a district, the main station receives the terminal active report of the terminal power failure event; Case two, for a plurality of terminals in a district, the main station simultaneously receives a plurality of terminals in the district active report of the terminal power failure event, and carries out data investigation A phase voltage on the terminal under the terminal which does not report the terminal power failure event, and carries out power failure research according to the investigation result; S12, for the terminal 1 times within a time period, the main station only handles the first report of the power failure event; S13, the main station judges whether there is marketing in the way process for the terminal on the same day, if there is, the terminal power failure event is discarded; S14, the main station judges whether the terminal power failure event occurrence time is valid, if not, the event is discarded; S15, the main station investigates the terminal acquisition A phase voltage or total meter A phase voltage, and preliminarily determines the power failure according to the investigation result; S16, the main station delays 2 minutes to report, waits for the terminal power-on event, and carries out continuous process according to the waiting result; S17, for HPLC low-voltage area, whether there is a power failure event of electric energy meter is verified synchronously, and the terminal and electric energy meter power failure event are comprehensively judged for the area power failure: if the terminal is judged to be power failure, and a plurality of electric meters under the corresponding terminal of the area are also judged to be power failure, the main station judges that the area is power failure, then the main station packages the terminal power failure event information, saves the power failure event information to the database, and pushes to the external system; S2, low-voltage area power recovery research, including: S21, the main station marks the terminal under the power failure unit of the area to report the power recovery event, and judges the area power recovery when the power recovery time is valid; S22, according to the file, whether there is distributed photovoltaic under the area is judged, and the power recovery is judged accordingly; S23, if the power recovery time is invalid and no other power failure event is reported, the A phase voltage of the total meter of the area is investigated to judge the power recovery; S24, the main station marks the terminal under the power failure unit of the area to report the power recovery event, and judges the area power recovery when the electric energy meter and the intelligent metering switch report valid power recovery events; S25, the main station marks the terminal under the power failure unit of the area and the meter to report the power recovery alarm event, but the load under the area reports more than 30% of the users, and judges the area power recovery: saves the power recovery event information and the electric energy meter table switch, inverter closing to the database, and pushes to the external system.

2. The method for judging power outages and restorations in low-voltage distribution areas as described in claim 1, characterized in that, In the case two of S11, the rated voltage of the electric energy meter under the terminal is 220V, and the determination threshold is 132V, the rated voltage of the electric energy meter is 100V, and the determination threshold is 60V; The investigation result is divided into two kinds: no return value or voltage value is 0V, or return value is greater than 0V and less than 132V.

3. The method for judging power outages and restorations in low-voltage distribution areas as described in claim 1, characterized in that, During the main station delay 2 minutes of S16, only the power-on event of the same terminal is judged, if the power-on event of any same terminal under the area is received, the corresponding terminal power failure event is discarded.

4. The method for judging power outages and restorations in low-voltage distribution areas as described in claim 2, characterized in that, In the synchronous verification of whether there is a power outage event of the electricity meter in S17, the power outage judgment includes: calling the voltage of phase A of the electricity meter. If the call result has no return value or the voltage value is 0V, or the return value is greater than 0V and less than 132V, then the electricity meter is determined to be out of power.

5. The method for judging power outages and restorations in low-voltage distribution areas as described in claim 1, characterized in that, In the distributed photovoltaic system of S22, the following situations apply: Scenario 1: If the power generation current of the distributed photovoltaic system is greater than or equal to 0.1A, then the multi-function switch is considered to have been successfully restored to power. Scenario 2: If the power generation current of the distributed photovoltaic is less than 0.1A, it will be compared with the standard distributed photovoltaic power generation efficiency. If the power generation efficiency of the household is 10% lower than that of the standard comparison household, it will be determined that the multi-function switch after the table failed to close, or the customer failed to close the simulated islanding switch, or the undervoltage disconnect switch was activated without manual closing.

6. The method for judging power outages and restorations in low-voltage distribution areas as described in claim 1, characterized in that, In S1 and S2, the judgment method also includes deduplication rules: if the main station receives a terminal power-on event, an electricity meter power-on event, a reported data collection data or electricity data within 5 minutes, it will perform corresponding deduplication processing.

7. A verification method for low-voltage transformer area power failure and power restoration, using the judgment method for low-voltage transformer area power failure and power restoration according to any one of claims 1-6, through transformer area and meter cross verification, characterized in that, Includes the following steps: S3. Verification of Low-Voltage Distribution Area Power Outage: Through cross-verification of power outage events, after the main station receives the power outage event reported by the terminal, it simultaneously triggers the following verification: For terminals that have not reported a power outage event, the A-phase voltage of their associated meters is measured. If the measurement result has no return value or the voltage value is 0V, or the return value is greater than 0V and less than 132V, the power outage of the meter is confirmed to be valid; if all terminals associated with the meters in the distribution area are out of power, the power outage event of the distribution area is confirmed to be valid. S4. Verification of Low-Voltage Distribution Area Power Restoration: Through cross-verification of meter power restoration events, after the main station receives the distribution area power restoration event reported by the terminal, it synchronously triggers the following verification: If the terminal power restoration time is valid, and the A-phase voltage of all meters under the distribution area is tested, if the test result has no return value or the voltage value is 0V, or the return value is greater than 0V and less than 132V, then the meter power restoration is confirmed to be valid; if ≥80% of the meters under the distribution area are restored and the load is restored to more than 30% of the level before the power outage, then the distribution area power restoration is confirmed to be valid.

8. The verification method for low-voltage transformer area power failure and power restoration according to claim 7, characterized in that, In S3, when cross-validating power outage events through the meter, the following situations are excluded: the meter repeatedly reports a power outage event within 1 hour; the time of the power outage event is not on the same day or the time difference with the current time is greater than 1 hour; the meter communication is interrupted but the voltage is normal.

9. The method for verifying the power restoration of low-voltage transformer area outage according to claim 7, characterized in that, In S4, when cross-verifying the power restoration event of the electricity meter, if the terminal does not report a power restoration event, but the electricity meter or smart meter switch reports a power restoration event, then the electricity meter time shall prevail; if the proportion of restored electricity meters is less than 80% or the load has not been restored, then the partial power restoration is confirmed to be effective, and the status of the remaining electricity meters needs to be checked.

10. The method for verifying the power restoration of low-voltage transformer area outage according to claim 7, characterized in that, The S4 also allows for verification of distributed photovoltaic power restoration by detecting the power generation current of the associated distributed photovoltaic meter: if the current is ≥0.1A, the switch after the meter is confirmed to be successfully closed; if the current is <0.1A and the power generation efficiency is 10% lower than the standard, the closing is determined to be a failure and an alarm is generated.

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