Distributed power supply access unit fault analysis method

Abstract

The invention relates to the technical field of distributed power supply fault judgment, in particular to a distributed power supply access unit fault analysis method, which comprises a working condition comparison module, a fault analysis module and a data processing module. The working condition comparison module periodically obtains working condition parameters of the distributed power supply access unit and updates the obtained data in real time; the fault analysis module comprises a plurality of fault models, a parameter fault threshold value and a duration out-of-limit threshold value of a corresponding working condition are set in each fault model, and when the equipment working condition exceeds the parameter fault threshold value and the duration exceeds the out-of-limit duration threshold value, fault occurrence is judged, a fault occurrence event is recorded, and the event is added into a processing queue of the data processing module; and the data processing module packages, stores and frames the fault event, and uploads the fault event to uplink equipment for processing. Only whether the working condition parameters are out of limit or not is judged in each period, the continuous out-of-limit time is recorded on the premise that the working condition parameters are out of limit, and the fault occurrence event can be accurately judged under the condition of low occupancy rate.

Description

Technical Field

[0001] The invention relates to the technical field of distributed power supply fault judgment, and in particular to a distributed power supply access unit fault analysis method. Background Art

[0002] Distributed power sources are often used to solve the problem of unstable working conditions such as the main body voltage. The distributed power access unit is required to have its own fault analysis function. The current commonly used solution is to use a polling algorithm to repeatedly compare the parameter threshold and the current working condition. However, this method has the following disadvantages: repeated comparisons can only record the current working instantaneous value, and cannot stably record the fault maintenance state, and the recorded value cannot accurately reflect the equipment operation status; repeated comparisons will cause high CPU occupancy of the equipment; multiple polling comparisons are prone to false alarms, resulting in multiple fault records, and the recorded occurrence time is not accurate enough. Summary of the invention

[0003] The present invention aims to solve the above problems and provides a method for analyzing faults of a distributed power supply access unit. The technical solution adopted is as follows: A method for analyzing faults of a distributed power access unit comprises a working condition comparison module, a fault analysis module and a data processing module; the working condition comparison module periodically obtains working condition parameters of the distributed power access unit and updates the obtained data in real time; the fault analysis module comprises a plurality of fault models, each fault model is provided with a parameter fault threshold and a time-limit crossing threshold of a corresponding working condition, when the equipment working condition exceeds the parameter fault threshold and the duration of maintaining the current limit-crossing working condition exceeds the limit-crossing time-limit threshold, it is determined that a fault has occurred, the fault occurrence event is recorded, and the event is added to a processing queue of a data processing module; the data processing module packages, stores and frames the fault events in the processing queue according to the event type, and uploads them to an uplink device for processing.

[0004] On the basis of the above scheme, the working condition comparison module adopts the cross-collection chip to exchange data. The working process of the working condition comparison module includes the following steps: A1. Obtain the model of the metering chip and use different communication protocols according to the model; A2. The cross-collection metering chip obtains the operating condition data from each access unit of the distributed power source and distinguishes the operating condition data according to its category; A3. Store the working condition data acquired in the same collection cycle in a unified manner; A4. The operating data in step A3 is read by the fault analysis module; A5. The operating condition data acquired in the next collection cycle is stored in an overwritten manner to complete the data update.

[0005] Preferably, the workflow of the fault analysis module includes: B1. Read the working condition data collected by the working condition acquisition module; B2. According to the fault model, determine whether the corresponding fault parameter threshold exists. If not, it indicates that the setting is not completed. At this time, an error is reported to the upstream device and the analysis is terminated; B3. According to the fault model, read the operating data obtained in step B1 that is the same type as the fault parameter threshold; B4. Compare the operating condition data read in step B3 with the fault parameter threshold to determine whether a fault has occurred; if no fault has occurred, the fault record flag is cleared and the operating condition analysis of this cycle is terminated. If a fault has occurred, the time when the operating condition parameter occurs is read and the operating condition parameter in subsequent cycles is compared with the fault parameter threshold; B5. Record the continuous duration of the operating condition data exceeding the parameter fault threshold, and compare the duration with the duration exceeding the limit threshold; if the duration does not exceed the exceeding limit duration, it is considered that the equipment exceeds the limit instantaneously and the fault has not occurred; if the duration is greater than or equal to the exceeding limit duration, it is considered that a fault has occurred and the fault occurrence event is recorded; B6. Add the fault event recorded in step B5 to the processing queue of the data processing module.

[0006] Preferably, the workflow of the data processing module includes the following steps: C1. Read the entry of the fault event from the pending queue. If there is no pending entry, end the analysis; C2. Use a circular storage method to record pending items; C3. Package the fault event content according to the event type; C4. Write the fault event to the storage address; C5. Frame the fault event content; C6. Pull down the fault event reporting pin; C7. Report events to uplink devices via carrier waves.

[0007] On the basis of the above scheme, the ring storage method includes: C2-1. Get the storage quantity of the current event and determine whether it is the maximum number that can be stored; C2-2. If the result of the determination in step C2-1 is no, the latest free position is used as the storage location of the entry to be processed; C2-3. If the judgment result of step C2-1 is yes, the earliest record position is used as the storage position of the entry to be processed.

[0008] Preferably, the fault model includes an overvoltage / undervoltage model and an overload / underload model, the operating condition data corresponding to the overvoltage / undervoltage model is voltage, and the operating condition data corresponding to the overload / underload model is current or power.

[0009] Based on the above solution, the fault model also includes a power outage model, and the operating data of the power outage model are voltage and current.

[0010] The beneficial effects of the present invention are: 1. Use periodic data query to ensure the real-time and accuracy of working condition data; in each cycle, only determine whether the working condition parameters are out of limit, and if so, record the continuous out-of-limit time. It is considered a fault only when the out-of-limit time is exceeded. In the case of low occupancy, it can stably record the maintenance status and time of the fault, and will not make multiple false alarms for the same fault, accurately determine the occurrence of the fault, and effectively avoid false alarms or repeated reports; 2. Adopt multiple fault models according to actual needs, and make comprehensive judgments through different working condition indicators and their combinations, which can meet the requirements of various types of fault analysis and have high judgment accuracy; 3. Use a circular storage method to temporarily store data to ensure that the data meets the storage entries and avoids the loss of faulty data, while effectively preventing data accumulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 : Overall analysis flow chart of the present invention; Figure 2 : Flow chart of the working condition acquisition module of the present invention; Figure 3 : Workflow diagram of the fault analysis module of the present invention; Figure 4 : Data processing module workflow diagram of the present invention. DETAILED DESCRIPTION

[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: like Figures 1 to 4 As shown, a method for analyzing faults of a distributed power supply access unit includes a working condition comparison module, a fault analysis module and a data processing module.

[0013] like Figure 2 As shown, the working condition comparison module periodically obtains the working condition data of the distributed power access unit and updates the obtained data in real time. Specifically, the working condition comparison module uses the exchange data acquisition chip to exchange data. The working process of the working condition comparison module includes the following steps: A1. Obtain the model of the metering chip and use different communication protocols according to the model; A2. The cross-collection metering chip obtains the operating condition data from each access unit of the distributed power source and distinguishes the operating condition data according to its category; A3. The working condition data acquired in the same collection cycle are stored uniformly, so that the fault analysis module can find the storage address and read the data; A4. The operating data in step A3 is read by the fault analysis module; A5. The operating condition data acquired in the next collection cycle is stored in an overwritten manner to complete the data update.

[0014] The fault analysis module contains multiple fault models. Each fault model has a parameter fault threshold and a time-limit threshold for the corresponding working condition. If the equipment working condition exceeds the parameter fault threshold and the duration of the current limit-limit working condition exceeds the time-limit threshold, a fault is determined to have occurred, the fault occurrence event is recorded, and the event is added to the processing queue of the data processing module.

[0015] Specifically, the fault model includes an overvoltage / undervoltage model and an overload / underload model, the operating condition data corresponding to the overvoltage / undervoltage model is voltage, and the operating condition data corresponding to the overload / underload model is current or power. The fault model also includes a power outage model, and the operating condition data of the power outage model are voltage and current. At the same time, the over-limit time threshold corresponding to the power outage model is less than the over-limit time threshold of the overvoltage / undervoltage model and the overload / underload model.

[0016] like Figure 3 As shown, the workflow of the fault analysis module includes: B1. Read the working condition data collected by the working condition acquisition module; B2. According to the fault model, determine whether the corresponding fault parameter threshold exists. If not, it indicates that the setting is not completed. At this time, an error is reported to the upstream device and the analysis is terminated; B3. According to the fault model, read the operating parameters of the same type as the fault parameter threshold in the operating condition data obtained in step B1; B4. Compare the operating data read in step B3 with the fault parameter threshold to determine whether a fault has occurred; if no fault has occurred, the fault record flag is cleared and the operating condition analysis of this cycle is terminated. If a fault has occurred, the time when the operating data occurred is read and the operating data of the corresponding access unit in the subsequent cycle is compared with the fault parameter threshold; B5. Record the continuous duration that the operating condition parameter exceeds the parameter fault threshold, and compare the duration with the duration over-limit threshold; if the duration does not exceed the over-limit duration, it is considered that the device is instantaneously over-limited and cannot maintain the specified pulse width, and the fault has not occurred; if the duration is greater than or equal to the over-limit duration, it is considered that a fault has occurred, and the fault occurrence event is recorded; B6. Add the fault event recorded in step B5 to the processing queue of the data processing module.

[0017] The data processing module packages, stores and frames the fault events in the processing queue according to the event type, and uploads them to the uplink device for processing. Figure 4 As shown, the workflow of the data processing module includes the following steps: C1. Read the entry of the fault event from the pending queue. If there is no pending entry, end the analysis; C2. Using the circular storage method to record the items to be processed can not only meet the needs of data temporary storage, but also avoid data accumulation; The ring storage method includes: C2-1. Get the storage quantity of the current event and determine whether it is the maximum number that can be stored; C2-2. If the result of the determination in step C2-1 is no, the latest free position is used as the storage location of the entry to be processed; C2-3. If the result of the determination in step C2-1 is yes, the earliest recorded position is used as the storage position of the entry to be processed; C3. Package the fault event content according to the event type; for example, the formats and contents of parameters such as voltage, current, and time are different, so it is necessary to distinguish whether the fault belongs to overvoltage / undervoltage, overload / underload, etc. according to the fault event type, and set the data saving format according to the specific event type to facilitate data storage; C4. Write the fault event to the storage address; C5. Frame the fault event content; C6. Pull down the fault event reporting pin; C7. Report events to uplink devices via carrier waves.

[0018] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments, and any changes or modifications made based on the present invention belong to the scope of protection claimed by the present invention.

Claims

1. A method for analyzing faults of a distributed power supply access unit, characterized in that: It includes a working condition comparison module, a fault analysis module and a data processing module; the working condition comparison module periodically obtains the working condition parameters of the distributed power access unit and updates the obtained data in real time; the fault analysis module includes multiple fault models, each fault model has a parameter fault threshold and a time-limit threshold of the corresponding working condition, and when the equipment working condition exceeds the parameter fault threshold and the duration of maintaining the current limit-limit working condition exceeds the limit-limit threshold, it is determined that a fault has occurred, the fault occurrence event is recorded, and the event is added to the processing queue of the data processing module; The data processing module packages, stores and frames the fault events in the processing queue according to the event type, and uploads them to the uplink device for processing.

2. A method for analyzing a fault of a distributed power supply access unit according to claim 1, characterized in that: The working condition comparison module uses the cross-collection chip to exchange data. The working condition comparison module includes the following steps: A1. Obtain the model of the metering chip and use different communication protocols according to the model; A2. The cross-collection metering chip obtains the operating condition data from each access unit of the distributed power source and distinguishes the operating condition data according to its category; A3. Store the working condition data acquired in the same collection cycle in a unified manner; A4. The operating data in step A3 is read by the fault analysis module; A5. The operating condition data acquired in the next collection cycle is stored in an overwritten manner to complete the data update.

3. A method for analyzing a fault of a distributed power supply access unit according to claim 1, characterized in that: The workflow of the fault analysis module includes: B1. Read the working condition data collected by the working condition acquisition module; B2. According to the fault model, determine whether the corresponding fault parameter threshold exists. If not, it indicates that the setting is not completed. At this time, an error is reported to the upstream device and the analysis is terminated; B3. According to the fault model, read the operating data obtained in step B1 that is the same type as the fault parameter threshold; B4. Compare the operating data read in step B3 with the fault parameter threshold to determine whether a fault has occurred; if no fault has occurred, the fault record flag is cleared and the operating condition analysis of this cycle is terminated. If a fault has occurred, the time when the operating condition parameter occurs is read and the operating data in subsequent cycles is compared with the fault parameter threshold; B5. Record the continuous duration of the operating condition data exceeding the parameter fault threshold, and compare the duration with the duration exceeding threshold; If the duration does not exceed the over-limit duration, it is considered that the device has exceeded the limit instantaneously and the fault has not occurred; if the duration is greater than or equal to the over-limit duration, it is considered that a fault has occurred and the fault occurrence event is recorded; B6. Add the fault event recorded in step B5 to the processing queue of the data processing module.

4. A method for analyzing a fault of a distributed power supply access unit according to claim 1, characterized in that: The workflow of the data processing module includes the following steps: C1. Read the entry of the fault event from the pending queue. If there is no pending entry, end the analysis; C2. Use a circular storage method to record pending items; C3. Package the fault event content according to the event type; C4. Write the fault event to the storage address; C5. Frame the fault event content; C6. Pull down the fault event reporting pin; C7. Report events to uplink devices via carrier waves.

5. A method for analyzing faults of a distributed power supply access unit according to claim 4, characterized in that: The ring storage method includes: C2-1. Get the storage quantity of the current event and determine whether it is the maximum number that can be stored; C2-2. If the result of the determination in step C2-1 is no, the latest free position is used as the storage location of the entry to be processed; C2-3. If the judgment result of step C2-1 is yes, the earliest record position is used as the storage position of the entry to be processed.

6. A method for analyzing faults of a distributed power supply access unit according to claim 1, characterized in that: The fault model includes an overvoltage / undervoltage model and an overload / underload model. The operating condition data corresponding to the overvoltage / undervoltage model is voltage, and the operating condition data corresponding to the overload / underload model is current or power.

7. A method for analyzing a fault of a distributed power supply access unit according to claim 6, characterized in that: The fault model also includes a power outage model, and the operating condition data of the power outage model are voltage and current.

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