Street light flicker detection method based on single lamp controller

Abstract

This invention discloses a street light flicker detection method based on a single-lamp controller, comprising: detecting street light fault flicker or mains power supply on / off frequency through the single-lamp controller; detecting whether the street light connected to the single-lamp controller is experiencing fault flicker or a start-stop flicker fault; and, after detecting a fault flicker, issuing an alarm through the street light system platform; or, after detecting a start-stop flicker fault, further determining through the street light system platform whether the start-stop flicker is caused by a fault in the power supply branch cable, and issuing an alarm if the start-stop flicker is determined to be caused by a fault in the power supply branch cable. This achieves specialized flicker detection for street light fixtures and, while detecting, can distinguish whether the cause of the street light flicker is a fault in the street light fixture or a fault in the power supply cable, thus improving fault location efficiency.

Description

Technical Field

[0001] This invention relates to the field of street light detection technology, and more specifically, to a street light flicker detection method based on a single-lamp controller. Background Technology

[0002] With the rapid development of urbanization and the continuous expansion of urban scale, streetlights, as a key infrastructure for urban nighttime lighting, are increasing in number, forming a vast and complex lighting network. The stable operation of streetlights plays a crucial role in ensuring nighttime traffic safety, maintaining nighttime public order, and improving the quality of nighttime life.

[0003] Currently, street light flickering has become a prominent issue affecting lighting safety. In terms of the scope and severity of the impact, it can be mainly divided into two categories: one is individual flickering, usually caused by aging street light driver power supplies or poor contact. Although this type of fault only affects a single lamp, if it is not addressed for a long time, the fault will gradually worsen, reducing the brightness of local lighting and posing potential safety hazards to pedestrians and non-motorized vehicles traveling at night. The other category is mass flickering, mostly caused by aging cables, loose connectors, or precursors to short circuits. This type of fault can cause dozens or even hundreds of street lights under the same power cable to flicker simultaneously, not only causing a large-scale decline in lighting quality, but also the strong visual flicker can interfere with drivers' vision. In key sections such as urban main roads, bridges, and tunnels, it can easily lead to rear-end collisions, scrapes, and other traffic accidents. If not dealt with in time, it may lead to mass safety incidents and seriously threaten public safety.

[0004] Currently, urban street lighting networks generally use single-lamp controllers as the final monitoring node. Their hardware form is mostly a small embedded terminal placed in the maintenance port of the lamp post. It has the core capability to collect the electrical parameters of the lamp (such as power, current, etc.) and communicate with the control center. It has gradually replaced traditional manual inspections and become the core equipment for intelligent lighting operation and maintenance, providing a hardware foundation for street lamp fault detection. However, existing single-lamp controllers can only collect basic electrical parameters and monitor routine faults (such as abnormal lamp extinguishing, over / under voltage), and do not yet have the specialized detection capability for streetlight flickering faults. Specifically, existing technology (application number 201420724314.1, application date: 2014.11.26) discloses an automatic fault detection, analysis, and repair warning LED streetlight, comprising: the LED streetlight connected to the mains circuit, wherein the automatic fault detection, analysis, and repair warning LED streetlight includes an LED streetlight head, a first detection device, and a second detection device; the LED streetlight head is connected to the mains circuit; a solar panel is installed behind the LED streetlight head, and the LED streetlight head contains a lithium battery, a detection and analysis device, an alarm device, and an analysis result storage device; the solar panel is connected to the alarm device, and the daily... The system simultaneously stores electricity and powers the alarm device. The detection and analysis device is connected to the analysis result storage device, and the lithium battery is connected to both the detection and analysis device and the analysis result storage device. The first detection device includes a first current detector, a second voltage detector, a temperature detector, and a drive power detector. The test port of the first detection device is connected to the LED street light head, and the information output terminal of the first detection device is connected to the detection and analysis device. The second detection device includes a second current detector and a second voltage detector. The test port of the second detection device is connected to the mains circuit, and the information output terminal of the second detection device is connected to the detection and analysis device. The detection and analysis device is connected to the analysis result storage device, and the analysis result storage device is connected to the alarm device. The alarm device sounds an alarm based on the alarm information transmitted from the analysis result storage device. In other words, the existing technology can obtain detection information such as street light operating voltage, street light current, mains voltage, and mains current through the first and second detection devices. Based on the detection information, it can analyze whether there is a fault in the street light. However, it cannot determine whether the street light flickering is caused by a problem with the street light itself or by a problem with the power supply cable, resulting in low efficiency in locating the cause of the street light flickering fault.

[0005] Therefore, how to detect whether streetlights are flickering and, when such flickering is detected, determine the type of cause of the flickering has become an urgent technical problem to be solved. Summary of the Invention

[0006] In view of this, the present invention provides a street light flicker detection method based on a single-lamp controller, used to detect whether a street light flickers and, when a flickering problem is detected, to determine the category of the cause of the street light flicker, including:

[0007] A single-lamp controller is configured, comprising a mains signal detection module, an AC parameter acquisition module, a communication module, and a microprocessor. The microprocessor is electrically connected to the mains signal detection module, the AC parameter acquisition module, and the communication module, respectively. The mains signal detection module is electrically connected to the power supply cable, the AC parameter acquisition module is electrically connected to the street lamp, and the communication module is communicatively connected to the street lamp system platform.

[0008] When the single-lamp controller is activated, the mains signal detection module acquires the mains voltage of the power supply cable in real time and transmits it to the microprocessor in real time.

[0009] The microprocessor receives the mains voltage in real time and determines whether the mains power supply is normal by comparing the mains voltage with the power outage voltage threshold.

[0010] If the mains power supply is normal, the street light fault flickering detection process begins, including: the microprocessor transmitting a working signal to the AC power parameter acquisition module; the AC power parameter acquisition module receiving the working signal and acquiring the active power data of the street light fixture every preset time interval and transmitting it to the microprocessor; the microprocessor receiving the active power data in real time and updating the sliding window as it receives the active power data using a sliding window mechanism to obtain the active power data sequence corresponding to the updated sliding window; calculating the coefficient of variation corresponding to the updated sliding window based on the active power data sequence; monitoring the number of times the coefficient of variation corresponding to the updated sliding window is greater than a preset variation threshold; when the number of times the coefficient of variation corresponding to the updated sliding window is greater than or equal to a preset judgment threshold, the street light fixture is judged to be fault flickering, a timestamp is generated, and the street light fault flickering detection ends.

[0011] If the mains power supply is abnormal, the system enters the mains power supply on / off frequency detection phase, which includes: the single-lamp controller further includes a backup power module electrically connected to the mains signal detection module, the AC parameter acquisition module, the communication module, and the microprocessor respectively; the backup power module provides power to the mains signal detection module, the AC parameter acquisition module, the communication module, and the microprocessor; the microprocessor continuously receives the mains voltage in real time and monitors the number of times the mains voltage is greater than the maximum power-on voltage threshold within a preset period starting from the moment the mains fault flicker judgment begins; when the number of times the mains voltage is greater than the maximum power-on voltage threshold is greater than or equal to the on / off frequency threshold, it is determined that the street lamp has an on / off flickering fault and the timestamp is generated, thus ending the mains power supply on / off frequency detection phase;

[0012] The microprocessor includes a unique identifier corresponding to the street light fixture. When the microprocessor determines that the street light fixture is experiencing a faulty flashing or a faulty start-stop flashing, the microprocessor generates flashing alarm data by using the unique identifier, the faulty flashing, and the timestamp corresponding to the faulty flashing. Alternatively, the microprocessor generates flashing alarm data by using the unique identifier, the faulty flashing, and the time corresponding to the faulty flashing. The flashing alarm data is then transmitted to the street light system platform via the communication module.

[0013] The street light system platform stores a street light power supply topology database. The platform receives the flashing alarm data, determines the corresponding power supply branch of the street light fixture in the power supply topology database based on the unique identifier of the flashing alarm data, and stores the flashing alarm data as alarm data in the alarm database of the power supply branch. It then acquires all alarm data from the alarm database and, based on all the alarm data in the alarm database, counts the number of street light poles reporting flashing faults and the number of street light poles reporting start-stop flashing faults within a preset time window before receiving the flashing alarm data. When a street light fault is reported... When the number of light poles reporting flashing faults is greater than 0, and the number of light poles reporting the start-stop flashing fault of the street light fixture is equal to 0, an individual light pole flashing alarm is generated based on the received flashing alarm data; when the number of light poles reporting the start-stop flashing fault of the street light fixture is greater than 0, and the number of light poles reporting the start-stop flashing fault of the street light fixture is greater than 0 but less than half the number of light poles in the power supply branch, the individual light pole flashing alarm is generated based on the received flashing alarm data, and the start-stop flashing is marked as important; when the number of light poles reporting the start-stop flashing fault of the street light fixture is greater than or equal to half the number of light poles in the power supply branch, it is determined that the start-stop flashing is caused by a power supply branch cable fault, and a power supply branch alarm is generated.

[0014] Optionally, the microprocessor receives the mains voltage in real time and determines whether the mains power supply is normal based on the mains voltage, including:

[0015] When the mains voltage is lower than the power outage voltage threshold, it is determined that the mains power supply is abnormal.

[0016] When the microprocessor receives the mains voltage at the current moment, and the mains voltage received within a preset time range before the current moment is greater than a preset mains threshold, it determines that the mains power supply at the current moment is normal.

[0017] Optionally, after entering the street light fault flicker detection, the method further includes:

[0018] The microprocessor keeps running and receives the mains voltage in real time, and determines whether the mains power supply is normal based on the mains voltage.

[0019] When the mains power supply is abnormal, the street light fault flashing detection is stopped, the flashing alarm data is generated, or the flashing alarm data is transmitted to the street light system platform via the communication module, and the mains power supply on / off frequency detection is initiated.

[0020] Optionally, the step of calculating the coefficient of variation corresponding to the updated sliding window based on the updated active power data sequence is performed in the following manner:

[0021] The updated average active power value corresponding to the sliding window is calculated based on the updated active power data sequence corresponding to the sliding window.

[0022] The updated standard deviation of active power corresponding to the sliding window is calculated based on the updated active power data sequence corresponding to the sliding window and the updated active power average value corresponding to the sliding window.

[0023] The coefficient of variation corresponding to the updated sliding window is calculated based on the average active power value and the standard deviation of active power corresponding to the updated sliding window.

[0024] Optionally, the number of times the coefficient of variation corresponding to the sliding window updated in real time is greater than a preset mutation threshold further includes:

[0025] When the number of times the coefficient of variation corresponding to the updated sliding window is greater than the preset variation threshold is less than the preset judgment threshold, it is determined that there is currently no flickering, and the street light fault flickering detection continues to run.

[0026] Optionally, after detecting the frequency of mains power supply on / off, the method further includes:

[0027] The microprocessor obtains the moment when the circuit voltage of the connected street light fixture is first greater than or equal to the preset re-brightening voltage via the AC parameter acquisition module.

[0028] The time period from the moment the mains power fault flickering judgment is entered to the moment when the circuit voltage of the street light fixture first exceeds or equals the preset relighting voltage is taken as the preset period.

[0029] Optionally, the number of times the mains voltage exceeds the maximum on-state voltage threshold within a preset period starting from the moment the mains power fault flickering judgment is detected further includes:

[0030] When the number of times the mains voltage exceeds the maximum power-on voltage threshold is less than the on / off frequency threshold, the single-lamp controller enters a low-power sleep state, waits for the mains voltage to restart the single-lamp controller, and then the microprocessor receives the mains voltage in real time and determines whether the mains power supply is normal based on the mains voltage.

[0031] Optionally, the step of statistically analyzing all the alarm data in the alarm database to count the number of streetlight poles reporting flashing faults and the number of streetlight poles reporting start-stop flashing faults within a preset time window before receiving the flashing alarm data includes:

[0032] Iterate through all the alarm data in the alarm database and filter out the alarm data whose timestamp is within the preset time window before the time when the flashing alarm data is received;

[0033] The selected alarm data is iterated through, and the number of alarm data including those indicating flashing streetlight malfunction is counted as the number of light poles reporting flashing streetlight malfunction. The number of alarm data including those indicating on-off flashing streetlight malfunction is counted as the number of light poles reporting on-off flashing streetlight malfunction.

[0034] Optionally, the backup power module's runtime minus the preset period is greater than or equal to 30 seconds.

[0035] Compared with the prior art, the street light flicker detection method based on a single-lamp controller provided by the present invention achieves at least the following beneficial effects:

[0036] 1. The street light flickering detection method based on a single-lamp controller provided by this invention detects street light fault flickering or mains power supply on / off frequency through a single-lamp controller. It detects whether the street light connected to the single-lamp controller is experiencing fault flickering or a start-stop flickering fault. After detecting a fault flickering street light, an alarm is triggered through the street light system platform. Alternatively, after detecting a start-stop flickering fault, the street light system platform further determines whether the start-stop flickering is caused by a fault in the power supply branch cable. If the start-stop flickering is indeed caused by a fault in the power supply branch cable, an alarm is triggered. This achieves specialized flickering detection for street light fixtures and, while detecting the flickering, can distinguish whether the cause is a fault in the street light fixture or a fault in the power supply cable, thus improving fault location efficiency.

[0037] 2. The street light flicker detection method based on a single lamp controller provided by the present invention combines the single lamp controller with the street light power supply topology database for correlation analysis to increase the judgment of start-stop flickering caused by power supply branch cable faults. No additional equipment is required, making the method provided by the present invention low in usage and maintenance costs and highly universal.

[0038] 3. The street light flicker detection method based on a single lamp controller provided by this invention calculates the coefficient of variation for judging the flicker of street light fixtures during street light fault flicker detection, monitors the number of times the mains voltage exceeds the maximum on-state voltage threshold during mains power supply on / off frequency detection, and sets a differentiated detection algorithm according to the two causes of street light fixture flicker, thereby achieving accurate detection and rapid response of street light fixtures.

[0039] Of course, any product implementing this invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0040] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0041] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0042] Figure 1 This is a schematic flowchart of a street light flicker detection method based on a single-lamp controller provided by the present invention.

[0043] Figure 2 This is a schematic diagram of a street light flicker detection system based on a single-lamp controller.

[0044] Figure 3 This is a schematic diagram of a single-lamp controller.

[0045] Figure 4 This is another schematic flowchart of the street light flicker detection method based on a single-lamp controller provided by the present invention.

[0046] Figure 5 This is another flowchart illustrating the street light flicker detection method based on a single-lamp controller provided by the present invention.

[0047] In the diagram: 1. Single lamp controller; 11. Mains signal detection module; 12. AC power parameter acquisition module; 13. Microprocessor; 14. Backup power module; 15. Communication module; 2. Power supply cable; 3. Street lamp fixture. Detailed Implementation

[0048] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0049] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0050] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0051] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0052] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0053] Example 1

[0054] Reference Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic flowchart of a street light flicker detection method based on a single-lamp controller provided by the present invention. Figure 2 This is a schematic diagram of a street light flicker detection system based on a single-lamp controller. Figure 3 This is a schematic diagram of a single-lamp controller, illustrating a specific embodiment of the street light flicker detection method based on a single-lamp controller provided by the present invention, including:

[0055] S101: Configure a single lamp controller 1. The single lamp controller 1 includes a mains signal detection module 11, an AC parameter acquisition module 12, a communication module 15, and a microprocessor 13. The microprocessor 13 is electrically connected to the mains signal detection module 11, the AC parameter acquisition module 12, and the communication module 15, respectively. The mains signal detection module 11 is electrically connected to the power supply cable 2, the AC parameter acquisition module 12 is electrically connected to the street lamp 3, and the communication module 15 is communicatively connected to the street lamp system platform 4.

[0056] S102: Start the single lamp controller 1, and the mains signal detection module 11 obtains the mains voltage of the power supply cable 2 in real time and transmits it to the microprocessor 13 in real time;

[0057] S103: Microprocessor 13 receives the mains voltage in real time and determines whether the mains power supply is normal by comparing the mains voltage with the power outage voltage threshold.

[0058] S1041: If the mains power supply is normal, enter the street light fault flicker detection, including: the microprocessor 13 transmits a working signal to the AC power parameter acquisition module 12, the AC power parameter acquisition module 12 receives the working signal, and collects the active power data of the street light fixture 3 every preset time period and transmits it to the microprocessor 13; the microprocessor 13 receives the active power data in real time, and updates the sliding window when receiving the active power data using a sliding window mechanism to obtain the active power data sequence corresponding to the updated sliding window; calculates the coefficient of variation corresponding to the updated sliding window based on the active power data sequence corresponding to the updated sliding window; monitors in real time the number of times the coefficient of variation corresponding to the updated sliding window is greater than the preset variation threshold, and when the number of times the coefficient of variation corresponding to the updated sliding window is greater than or equal to the preset judgment threshold, it is judged as a street light fixture fault flicker and a timestamp is generated, and the street light fault flicker detection ends;

[0059] S1042: If the mains power supply is abnormal, the mains power supply on / off frequency detection is initiated, including: the single lamp controller 1 also includes a backup power module 14 that is electrically connected to the mains signal detection module 11, the AC parameter acquisition module 12, the communication module 15 and the microprocessor 13 respectively. The backup power module 14 provides power to the mains signal detection module 11, the AC parameter acquisition module 12, the communication module 15 and the microprocessor 13. The microprocessor 13 keeps receiving the mains voltage in real time and monitors the number of times the mains voltage is greater than the maximum on-state voltage threshold within a preset period from the time when the mains fault flicker judgment is initiated. When the number of times the mains voltage is greater than the maximum on-state voltage threshold is greater than or equal to the on / off frequency threshold, it is determined to be a street lamp start-stop flickering fault and a timestamp is generated, and the mains power supply on / off frequency detection ends.

[0060] S105: The microprocessor 13 includes a unique identifier for the corresponding street light fixture 3. When the microprocessor 13 determines that the street light fixture is malfunctioning and flashing or that the street light fixture is malfunctioning and flashing during start-stop operation, the microprocessor 13 generates flashing alarm data by using the unique identifier, the street light fixture malfunctioning and flashing, and the timestamp corresponding to the street light fixture malfunctioning and flashing. Alternatively, the microprocessor 13 generates flashing alarm data by using the unique identifier, the street light fixture malfunctioning and flashing during start-stop operation, and the timestamp corresponding to the street light fixture malfunctioning and flashing. The flashing alarm data is then transmitted to the street light system platform 4 via the communication module 15.

[0061] S106: The street light system platform 4 stores a street light power supply topology database. The street light system platform 4 receives flashing alarm data, determines the corresponding street light fixture 3's power supply branch in the street light power supply topology database based on the unique identifier of the flashing alarm data, and stores the flashing alarm data as alarm data in the alarm database of the power supply branch; it acquires all alarm data from the alarm database, and based on all alarm data in the alarm database, it counts the number of light poles reporting street light fixture flashing faults and the number of light poles reporting street light fixture start-stop flashing faults within a preset time window before receiving the flashing alarm data; when a street light fixture flashing fault is reported... When the number of light poles is greater than 0, and the number of light poles reporting street light fixture start-stop flashing faults is equal to 0, an individual light pole flashing alarm is generated based on the received flashing alarm data; when the number of light poles reporting street light fixture fault flashing is greater than 0, and the number of light poles reporting street light fixture start-stop flashing faults is greater than 0 but less than half the number of light poles in the power supply branch, an individual light pole flashing alarm is generated based on the received flashing alarm data, and the start-stop flashing is marked for attention; when the number of light poles reporting street light fixture start-stop flashing faults is greater than or equal to half the number of light poles in the power supply branch, it is determined that the start-stop flashing is caused by a power supply branch cable fault, and a power supply branch alarm is generated.

[0062] It should be noted that the single-lamp controller 1 can also be called a street light controller, and an existing structure can be used. In step S101, after the mains signal detection module 11 is electrically connected to the power supply cable 2, the single-lamp controller 1 powers on to complete self-test and basic parameter loading, including the initialization process such as functional verification of the mains signal detection module 11, AC power parameter acquisition module 12, communication module 15, and backup power module 14, to ensure that each module is in normal working condition, and enters the real-time monitoring stage after initialization is completed. In step S102, after the single-lamp controller 1 is started, the mains signal detection module 11 obtains the voltage status of the power supply cable 2 in real time, that is... Figure 2 middle Regarding voltage changes, in this embodiment, the voltage detection range of the mains power signal detection module 11 covers AC0V to AC265V. In step S1041, the street light fault flicker detection targets flickering scenarios caused by abnormalities in the street light fixture 3 itself when the mains power supply is continuously and stably supplied. Specifically, this includes unstable light emission caused by aging and light decay of the light source of the street light fixture 3, excessive ripple of the driving power supply included in the street light fixture 3, output voltage / current fluctuations, or mismatch between the street light fixture 3 and the driving power supply. Through the AC parameter acquisition module 12 built into the single lamp controller 1 (acquiring power, current, and other data), the period of "electrical parameter fluctuation (corresponding to the brightness change of the street light fixture 3)" is used as the statistical object, and the density of fluctuation events is used as the judgment criterion to identify the street light flickering under normal mains power supply conditions. In step S1042, the mains power supply on / off frequency detection targets the scenario of "frequent mains power supply voltage on / off" caused by line faults such as loose power cable 2, joint oxidation, and partial short circuit. The backup power module 14 ensures that the single-lamp controller 1 can continue to operate even when the mains power supply is interrupted. The complete on / off cycle from "voltage drop (streetlight 3 goes out) to voltage rise (streetlight 3 lights up)" is used as the statistical object, and the density of mains power on / off events is used as the judgment criterion to accurately identify low-frequency flickering of the streetlight caused by power supply interruption (covering the frequency range of 0.5Hz to 5Hz that is clearly perceptible to the human eye). In step S105, when the microprocessor 13 determines that the streetlight is flickering due to a fault or a start-stop flickering fault, it immediately activates the communication module 15 to transmit the unique identifier of the corresponding streetlight 3, the flickering type, and the fault occurrence timestamp to the streetlight system platform 4 in real time. The unique identifier can be a number, used by the system platform to locate a specific street light fixture 3. The fault type is either a street light fixture flickering fault or a street light fixture start-stop flickering fault. The communication method between the communication module 15 and the street light system platform 4 can be selected from mainstream IoT communication protocols such as LoRa, NB-IoT, and 4G. The specific method can be adapted according to the actual scenario, and this embodiment does not impose specific restrictions on it. In step S106, the street light system platform 4 receives flickering alarm data in real time, associates it with its internal street light power supply topology database through the unique identifier, and obtains the basic information of the power supply branch to which the street light pole belongs. The basic information may include the total number of street light fixtures 3 in the power supply branch, cable number, and topology node, forming a dataset containing "pole number, fault type, timestamp, and power supply branch". The associated dataset is grouped according to "power supply branch", focusing on the cluster feature analysis of the two types of flickering faults, and quickly determining whether the cause of the flickering of the street light fixture 3 is a fault of the street light fixture 3 or a fault of the power supply cable 2.

[0063] Understandably, by using the single-lamp controller 1 to detect streetlight flickering or mains power supply on / off frequency, the system can detect whether the streetlight 3 connected to the single-lamp controller 1 is experiencing flickering due to a fault or a start-stop flickering fault. Upon detecting a flickering fault in streetlight 3, an alarm is triggered via the streetlight system platform 4. Alternatively, after detecting a start-stop flickering fault, the streetlight system platform 4 can further determine whether the start-stop flickering is caused by a fault in the power supply branch cable, and trigger an alarm if the power supply branch cable fault is confirmed. This achieves specialized flicker detection for streetlight 3, and simultaneously distinguishes whether the flickering is caused by a fault in streetlight 3 or a fault in the power supply cable 2, improving fault location efficiency. By combining the single-lamp controller 1 with streetlight power supply topology database correlation analysis to enhance the judgment of start-stop flickering caused by power supply branch cable faults, no additional equipment deployment is required, making the method provided by this invention low in usage and maintenance costs and highly universal. When detecting flickering in streetlights, the coefficient of variation is calculated to determine the flickering of streetlight fixtures. When detecting the frequency of mains power supply on / off, the number of times the mains voltage exceeds the maximum on-voltage threshold is monitored. Differentiated detection algorithms are set according to the two causes of flickering in streetlight fixture 3, thereby achieving accurate detection and rapid response of streetlight fixture 3.

[0064] Example 2

[0065] Reference Figure 4 and Figure 5 , Figure 4 This is another schematic flowchart of the street light flicker detection method based on a single-lamp controller provided by the present invention. Figure 5 This is another flowchart illustrating a street light flicker detection method based on a single-lamp controller provided by the present invention, used to explain another embodiment of the street light flicker detection method based on a single-lamp controller provided by the present invention, including:

[0066] S201: Configure a single lamp controller. The single lamp controller includes a mains signal detection module, an AC parameter acquisition module, a communication module, and a microprocessor. The microprocessor is electrically connected to the mains signal detection module, the AC parameter acquisition module, and the communication module, respectively. The mains signal detection module is electrically connected to the power supply cable, the AC parameter acquisition module is electrically connected to the street lamp, and the communication module is connected to the street lamp system platform.

[0067] S202: Start the single lamp controller. The mains signal detection module obtains the mains voltage of the power supply cable in real time and transmits it to the microprocessor in real time.

[0068] S203: The microprocessor receives the mains voltage in real time and determines whether the mains power supply is normal by comparing the mains voltage with the power outage voltage threshold, including:

[0069] S2031: When the mains voltage is lower than the power outage voltage threshold, it is determined that the mains power supply is abnormal;

[0070] S2032: When the microprocessor receives the mains voltage at the current moment, and the mains voltage received within a preset time range before the current moment is greater than the preset mains threshold, it is determined that the mains power supply at the current moment is normal.

[0071] S2041: If the mains power supply is normal, enter the street light fault flicker detection process, including: the microprocessor transmits a working signal to the AC power parameter acquisition module; the AC power parameter acquisition module receives the working signal, acquires the active power data of the street light fixture every preset time period, and transmits it to the microprocessor; the microprocessor receives the active power data in real time, and updates the sliding window when receiving active power data using a sliding window mechanism to obtain the active power data sequence corresponding to the updated sliding window; calculates the coefficient of variation corresponding to the updated sliding window based on the active power data sequence corresponding to the updated sliding window; monitors in real time the number of times the coefficient of variation corresponding to the updated sliding window is greater than the preset variation threshold; when the number of times the coefficient of variation corresponding to the updated sliding window is greater than the preset variation threshold is less than the preset judgment threshold, it is determined that there is currently no flickering, and the street light fault flicker detection continues to run; when the number of times the coefficient of variation corresponding to the updated sliding window is greater than or equal to the preset variation threshold, it is determined that the street light fixture is fault flickering and a timestamp is generated, ending the street light fault flicker detection;

[0072] S2042: If the mains power supply is abnormal, the system enters the mains power supply on / off frequency detection phase. This includes: the single-lamp controller also includes a backup power module electrically connected to the mains signal detection module, AC parameter acquisition module, communication module, and microprocessor. The backup power module provides power to the mains signal detection module, AC parameter acquisition module, communication module, and microprocessor. The microprocessor continuously receives the mains voltage in real time and monitors the number of times the mains voltage exceeds the maximum on-state voltage threshold within a preset period starting from the moment the mains fault flickering judgment begins. When the number of times the mains voltage exceeds the maximum on-state voltage threshold is less than the on / off frequency threshold, the single-lamp controller enters a low-power sleep state, waiting for the mains voltage to restart. The microprocessor then receives the mains voltage in real time and determines whether the mains power supply is normal based on the mains voltage. When the number of times the mains voltage exceeds the maximum on-state voltage threshold is greater than or equal to the on / off frequency threshold, a streetlight start-stop flickering fault is determined, a timestamp is generated, and the mains power supply on / off frequency detection ends.

[0073] S205: The microprocessor includes the unique identifier of the corresponding street light fixture. When the microprocessor determines that the street light fixture is malfunctioning and flashing or is experiencing a start-stop type flashing fault, the microprocessor generates flashing alarm data by using the unique identifier, the street light fixture malfunctioning and flashing, and the timestamp corresponding to the street light fixture malfunctioning and flashing. Alternatively, the microprocessor generates flashing alarm data by using the unique identifier, the street light fixture start-stop type flashing fault, and the timestamp corresponding to the street light fixture start-stop type flashing fault. The flashing alarm data is then transmitted to the street light system platform via the communication module.

[0074] S206: The street light system platform stores a street light power supply topology database. Upon receiving flickering alarm data, the platform determines the corresponding street light fixture's power supply branch in the power supply topology database based on the unique identifier of the flickering alarm data, and stores the flickering alarm data as alarm data in the alarm database of that power supply branch. It then retrieves all alarm data from the alarm database and, based on all alarm data in the alarm database, counts the number of street light poles reporting flickering faults and the number of street light poles reporting start-stop flickering faults within a preset time window before the moment the flickering alarm data was received. This includes: traversing all alarm data in the alarm database and filtering out alarm data with timestamps within the preset time window before the moment the flickering alarm data was received; traversing the filtered alarm data and counting the number of alarm data including those with flickering faults in street light fixtures as the reported alarm data. The number of streetlights experiencing flashing malfunctions is counted, including the number of alarm data related to on-off flashing malfunctions. This count is used to determine the number of streetlights reporting on-off flashing malfunctions. When the number of reported flashing malfunctions is greater than 0 and the number of reported on-off flashing malfunctions is equal to 0, an individual streetlight flashing alarm is generated based on the received flashing alarm data. When the number of reported flashing malfunctions is greater than 0 and the number of reported on-off flashing malfunctions is greater than 0 but less than half the number of streetlights in the power supply branch, an individual streetlight flashing alarm is generated based on the received flashing alarm data, and the on-off flashing malfunction is marked for attention. When the number of reported on-off flashing malfunctions is greater than or equal to half the number of streetlights in the power supply branch, it is determined that the on-off flashing is caused by a power supply branch cable fault, and a power supply branch alarm is generated.

[0075] It should be noted that in this embodiment, the power-off voltage threshold in step S2031 is 30V. When the mains voltage is less than 30V, the street light fixture and its driver power supply stop working, the street light fixture goes out, and it is determined that the mains power supply is abnormal. In this embodiment, in step S2032, the preset time range is 5 seconds, and the preset mains voltage threshold is AC80V. If the received mains voltage is consistently greater than 80V within the first 5 seconds of the current moment, it is determined that the mains power supply at the current moment is normal. The preset mains voltage threshold can be flexibly adjusted according to the minimum supply voltage required for the street light fixture to trigger lighting. The preset time range and power-off voltage threshold can also be adjusted according to actual conditions. This embodiment does not impose specific limitations on these aspects.

[0076] In step S2041, a sliding window mechanism is used to update the sliding window when receiving active power data, resulting in the active power data sequence corresponding to the updated sliding window, including: the window length of the sliding window is... The preset time period is The number of sampling points within the sliding window is The sliding step size is The data within the sliding window is dynamically updated according to the "first-in, first-out" principle, ensuring that the sliding window always contains... One continuous sampling point; Initial stage: Before data collection Using 10 sampling points, a sliding window of the first complete data is constructed to form the initial active power data sequence. Sliding phase: after each sampling interval One new active power data point was collected. At the same time, remove the oldest active power data in the sliding window. The active power data sequence within the sliding window is updated to With each subsequent slide, the active power data sequence is synchronously updated to... , And so on; continuous output: During the sliding process, each time the sliding window is updated, the complete active power data sequence within the current sliding window is output, providing real-time data support for subsequent coefficient of variation calculation. The coefficient of variation corresponding to the updated sliding window is calculated based on the active power data sequence corresponding to the updated sliding window, as follows:

[0077] The average active power value corresponding to the updated sliding window is calculated based on the active power data sequence corresponding to the updated sliding window, as follows:

[0078] ;

[0079] in, The average active power corresponding to the updated sliding window. The active power data sequence corresponding to the updated sliding window is the first... One active power data;

[0080] The standard deviation of active power corresponding to the updated sliding window is calculated based on the active power data sequence and the average active power value corresponding to the updated sliding window, as follows:

[0081] ;

[0082] in, The standard deviation of active power corresponding to the updated sliding window;

[0083] The coefficient of variation for the updated sliding window is calculated based on the average active power and the standard deviation of active power corresponding to the updated sliding window, as follows:

[0084] ;

[0085] in, This represents the coefficient of variation corresponding to the updated sliding window.

[0086] In step S2041, based on the real-time variation coefficient of the output sliding window, the street light fixture's flickering fault is accurately identified through the judgment logic of "real-time threshold comparison + window over-limit counting". The core is to utilize the dynamic characteristic of the sliding window's "forward and backward" movement, ensuring that the counter always reflects the over-limit characteristics within the current window. This guarantees sensitive detection of continuous flickering faults while filtering out occasional interference through multi-frequency statistical analysis. Specifically, a preset variation threshold is used. The preset value is 0.1 to 0.3, with a default value of 0.2 in this embodiment. This is a dimensionless index, suitable for the power fluctuation characteristics of lamps across the entire power range; a preset judgment threshold is also included. Preset 0.6 Up to 0.8 In this embodiment, the default value is 0.7. , refers to the current sliding window ( The active power data corresponds to In the next judgment) The minimum cumulative number of times the limit is exceeded is used to distinguish between "intermittent interference" and "continuous flickering". The single-lamp controller updates according to the sliding window's update rhythm (every interval). The following logic is followed to ensure that the counter is strictly bound to the current sliding window data: The real-time variation coefficient of the current sliding window is updated each time. The single-lamp controller immediately matches the preset variation threshold. Compare and output the result of a single judgment: If Marked as "single instance of exceeding limit"; if Marked as "Single Normal"; the single-lamp controller has a built-in "Window Over-Limit Counter". Its value is strictly equal to the value within the current sliding window. The total number of "single exceedance" entries in the judgment results corresponding to each active power data point is updated according to the following rules: When a new active power data point is added to the sliding window, if the judgment corresponding to that data point is "single exceedance", then... When a historical active power data point is removed from the sliding window, if the corresponding active power data point is classified as "single-time exceedance," then... If the newly added / removed active power data is determined to be "single normal", then It remains unchanged because the window always contains One active power data point, therefore The range of values ​​is Reflecting the current situation Number of times exceeding the limit within seconds. Real-time fault determination: each time. After the update, the single-lamp controller will immediately adjust the position of the light each time the window is swiped. and Comparison: If If the flickering is determined to be due to a malfunction in the streetlights, it can also be referred to as "regular streetlight flickering"; if The window was determined to be "flicker-free" and continued to update as it slid across the window. And monitoring. After entering the street light fault flicker detection, it also includes: the microprocessor keeps running to receive the mains voltage in real time, and determines whether the mains power supply is normal based on the mains voltage; when the mains power supply is abnormal, the street light fault flicker detection is stopped, flicker alarm data is generated or the flicker alarm data is transmitted to the street light system platform via the communication module, and the mains power supply on / off frequency detection is entered.

[0087] In step S2042, the normal operating voltage of the streetlight fixture is typically greater than or equal to AC80V, the lower limit of the input voltage of the streetlight fixture's drive power supply is generally greater than or equal to AC100V, and the lower limit of the operating voltage of the main circuit of the single-lamp controller is generally greater than or equal to AC60V. When the mains voltage drops from the normal operating range (AC180V to AC265V) to the power-off voltage threshold, the streetlight fixture, drive power supply, and main functional module of the single-lamp controller all stop operating due to the voltage being lower than the operating lower limit. The streetlight fixture immediately goes out, and the backup power module in the single-lamp controller supplies power to the core circuit modules such as the mains signal detection module, AC power parameter acquisition module, communication module, and microprocessor. The microprocessor obtains the moment when the loop voltage of the connected streetlight fixture first exceeds or equals the preset re-brightening voltage through the AC power parameter acquisition module; the time period from the moment of entering the mains fault flashing judgment to the moment when the loop voltage of the streetlight fixture first exceeds or equals the preset re-brightening voltage is used as the preset period. The backup power module's runtime minus the preset period is greater than or equal to 30 seconds to ensure that the equipment does not reset during the entire process from the initial sudden drop trigger to the final judgment and alarm. In this embodiment, the maximum on-state voltage threshold is AC100V, and the on / off frequency threshold is... The number of times is 3. During the period when the standby power module is supplying power, the single-lamp controller uses "first reduction" as the timing start point to capture and count the complete cycle from "power outage to power on," corresponding to one flashing cycle from "off to on" of the lamp. Load power outages do not affect the mains power on / off monitoring. Within a preset period starting from the moment the mains power fault flashing judgment is entered, the number of times the mains voltage exceeds the maximum on-state voltage threshold is recorded. At this time, the frequency is in the low-frequency range that is "easily noticeable and causes discomfort" to the human eye. Frequent switching on and off will inevitably cause the streetlights to flicker on and off, which is judged as a "streetlight flickering fault". If the mains voltage exceeds the maximum on-state voltage threshold a certain number of times... When the power supply is restored, the device enters a low-power sleep state and waits for the mains power to be restored before restarting monitoring.

[0088] It is understood that the threshold in this embodiment can be adjusted according to the actual situation, and this embodiment does not impose specific limitations on it. In this embodiment, through dimensionless analysis of the power variation coefficient, the magnitude difference of different power lamps from 30W to 300W is separated, realizing standardized detection across the entire power range without the need for parameter adjustment for each scenario. By using a single lamp controller to detect street lamp fault flickering or mains power supply on / off frequency, the system can detect whether the street lamp connected to the single lamp controller is experiencing a street lamp fault flickering or a street lamp start-stop flickering fault. After detecting a street lamp fault flickering, an alarm is triggered through the street lamp system platform. Alternatively, after detecting a street lamp start-stop flickering fault, the street lamp system platform can further determine whether the start-stop flickering is caused by a power supply branch cable fault, and an alarm is triggered if the start-stop flickering is caused by a power supply branch cable fault. This achieves specialized flicker detection for street lamps and can distinguish whether the cause of the street lamp flickering is a street lamp fault or a power supply cable fault, improving fault location efficiency. By combining a single-lamp controller with a streetlight power supply topology database for correlation analysis, the method enhances the ability to detect start-stop flickering caused by power supply branch cable faults. This eliminates the need for additional equipment deployment, resulting in low usage and maintenance costs and broad applicability. During streetlight flicker detection, a coefficient of variation is calculated for fault identification. In mains power supply on / off frequency detection, the number of times the mains voltage exceeds the maximum on-state voltage threshold is monitored. Differential detection algorithms are set based on the two causes of streetlight flickering, thereby achieving accurate detection and rapid response for streetlights.

[0089] As can be seen from the above embodiments, the street light flicker detection method based on a single-lamp controller provided by the present invention achieves at least the following beneficial effects:

[0090] 1. The street light flickering detection method based on a single-lamp controller provided by this invention detects street light fault flickering or mains power supply on / off frequency through a single-lamp controller. It detects whether the street light connected to the single-lamp controller is experiencing fault flickering or a start-stop flickering fault. After detecting a fault flickering street light, an alarm is triggered through the street light system platform. Alternatively, after detecting a start-stop flickering fault, the street light system platform further determines whether the start-stop flickering is caused by a fault in the power supply branch cable. If the start-stop flickering is indeed caused by a fault in the power supply branch cable, an alarm is triggered. This achieves specialized flickering detection for street light fixtures and, while detecting the flickering, can distinguish whether the cause is a fault in the street light fixture or a fault in the power supply cable, thus improving fault location efficiency.

[0091] 2. The street light flicker detection method based on a single lamp controller provided by the present invention combines the single lamp controller with the street light power supply topology database for correlation analysis to increase the judgment of start-stop flickering caused by power supply branch cable faults. No additional equipment is required, making the method provided by the present invention low in usage and maintenance costs and highly universal.

[0092] 3. The street light flicker detection method based on a single lamp controller provided by this invention calculates the coefficient of variation for judging the flicker of street light fixtures during street light fault flicker detection, monitors the number of times the mains voltage exceeds the maximum on-state voltage threshold during mains power supply on / off frequency detection, and sets a differentiated detection algorithm according to the two causes of street light fixture flicker, thereby achieving accurate detection and rapid response of street light fixtures.

[0093] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A street light flicker detection method based on a single-lamp controller, characterized in that, include: A single-lamp controller is configured, comprising a mains signal detection module, an AC parameter acquisition module, a communication module, and a microprocessor. The microprocessor is electrically connected to the mains signal detection module, the AC parameter acquisition module, and the communication module, respectively. The mains signal detection module is electrically connected to the power supply cable, the AC parameter acquisition module is electrically connected to the street lamp, and the communication module is communicatively connected to the street lamp system platform. When the single-lamp controller is activated, the mains signal detection module acquires the mains voltage of the power supply cable in real time and transmits it to the microprocessor in real time. The microprocessor receives the mains voltage in real time and determines whether the mains power supply is normal by comparing the mains voltage with the power outage voltage threshold. If the mains power supply is normal, the street light fault flickering detection process begins, including: the microprocessor transmitting a working signal to the AC power parameter acquisition module; the AC power parameter acquisition module receiving the working signal and acquiring the active power data of the street light fixture every preset time interval and transmitting it to the microprocessor; the microprocessor receiving the active power data in real time and updating the sliding window as it receives the active power data using a sliding window mechanism to obtain the active power data sequence corresponding to the updated sliding window; calculating the coefficient of variation corresponding to the updated sliding window based on the active power data sequence; monitoring the number of times the coefficient of variation corresponding to the updated sliding window is greater than a preset variation threshold; when the number of times the coefficient of variation corresponding to the updated sliding window is greater than or equal to a preset judgment threshold, the street light fixture is judged to be fault flickering, a timestamp is generated, and the street light fault flickering detection ends. If the mains power supply is abnormal, the system enters the mains power supply on / off frequency detection phase, which includes: the single-lamp controller further includes a backup power module electrically connected to the mains signal detection module, the AC parameter acquisition module, the communication module, and the microprocessor respectively; the backup power module provides power to the mains signal detection module, the AC parameter acquisition module, the communication module, and the microprocessor; the microprocessor continuously receives the mains voltage in real time and monitors the number of times the mains voltage is greater than the maximum power-on voltage threshold within a preset period starting from the moment the mains fault flicker judgment begins; when the number of times the mains voltage is greater than the maximum power-on voltage threshold is greater than or equal to the on / off frequency threshold, it is determined that the street lamp has an on / off flickering fault and the timestamp is generated, thus ending the mains power supply on / off frequency detection phase; The microprocessor includes a unique identifier corresponding to the street light fixture. When the microprocessor determines that the street light fixture is experiencing a faulty flashing or a faulty start-stop flashing, the microprocessor generates flashing alarm data by using the unique identifier, the faulty flashing, and the timestamp corresponding to the faulty flashing. Alternatively, the microprocessor generates flashing alarm data by using the unique identifier, the faulty flashing, and the time corresponding to the faulty flashing. The flashing alarm data is then transmitted to the street light system platform via the communication module. The street light system platform stores a street light power supply topology database. The platform receives the flashing alarm data, determines the corresponding power supply branch of the street light fixture in the power supply topology database based on the unique identifier of the flashing alarm data, and stores the flashing alarm data as alarm data in the alarm database of the power supply branch. It then acquires all alarm data from the alarm database and, based on all the alarm data in the alarm database, counts the number of street light poles reporting flashing faults and the number of street light poles reporting start-stop flashing faults within a preset time window before receiving the flashing alarm data. When a street light fault is reported... When the number of light poles reporting flashing faults is greater than 0, and the number of light poles reporting the start-stop flashing fault of the street light fixture is equal to 0, an individual light pole flashing alarm is generated based on the received flashing alarm data; when the number of light poles reporting the start-stop flashing fault of the street light fixture is greater than 0, and the number of light poles reporting the start-stop flashing fault of the street light fixture is greater than 0 but less than half the number of light poles in the power supply branch, the individual light pole flashing alarm is generated based on the received flashing alarm data, and the start-stop flashing is marked as important; when the number of light poles reporting the start-stop flashing fault of the street light fixture is greater than or equal to half the number of light poles in the power supply branch, it is determined that the start-stop flashing is caused by a power supply branch cable fault, and a power supply branch alarm is generated.

2. The street light flicker detection method based on a single-lamp controller according to claim 1, characterized in that, The microprocessor receives the mains voltage in real time and determines whether the mains power supply is normal based on the mains voltage, including: When the mains voltage is lower than the power outage voltage threshold, it is determined that the mains power supply is abnormal. When the microprocessor receives the mains voltage at the current moment, and the mains voltage received within a preset time range before the current moment is greater than a preset mains threshold, it determines that the mains power supply at the current moment is normal.

3. The street light flicker detection method based on a single-lamp controller according to claim 1, characterized in that, After entering the street light malfunction flashing detection, the following is also included: The microprocessor keeps running and receives the mains voltage in real time, and determines whether the mains power supply is normal based on the mains voltage. When the mains power supply is abnormal, the street light fault flashing detection is stopped, the flashing alarm data is generated, or the flashing alarm data is transmitted to the street light system platform via the communication module, and the mains power supply on / off frequency detection is initiated.

4. The street light flicker detection method based on a single-lamp controller according to claim 1, characterized in that, The step of calculating the coefficient of variation corresponding to the updated sliding window based on the active power data sequence corresponding to the updated sliding window is performed in the following manner: The updated average active power value corresponding to the sliding window is calculated based on the updated active power data sequence corresponding to the sliding window. The updated standard deviation of active power corresponding to the sliding window is calculated based on the updated active power data sequence corresponding to the sliding window and the updated active power average value corresponding to the sliding window. The coefficient of variation corresponding to the updated sliding window is calculated based on the average active power value and the standard deviation of active power corresponding to the updated sliding window.

5. The street light flickering detection method based on a single-lamp controller according to claim 1, characterized in that, The number of times the coefficient of variation corresponding to the sliding window updated in real time is greater than a preset mutation threshold also includes: When the number of times the coefficient of variation corresponding to the updated sliding window is greater than the preset variation threshold is less than the preset judgment threshold, it is determined that there is currently no flickering, and the street light fault flickering detection continues to run.

6. The street light flickering detection method based on a single-lamp controller according to claim 1, characterized in that, After the detection of the frequency of mains power supply on / off, the following is also included: The microprocessor obtains the moment when the circuit voltage of the connected street light fixture is first greater than or equal to the preset re-brightening voltage via the AC parameter acquisition module. The time period from the moment the mains power fault flickering judgment is entered to the moment when the circuit voltage of the street light fixture first exceeds or equals the preset relighting voltage is taken as the preset period.

7. The street light flicker detection method based on a single-lamp controller according to claim 1, characterized in that, The number of times the mains voltage exceeds the maximum on-state voltage threshold within a preset period starting from the moment the mains power fault flickering judgment is detected also includes: When the number of times the mains voltage exceeds the maximum power-on voltage threshold is less than the on / off frequency threshold, the single-lamp controller enters a low-power sleep state, waits for the mains voltage to restart the single-lamp controller, and then the microprocessor receives the mains voltage in real time and determines whether the mains power supply is normal based on the mains voltage.

8. The street light flicker detection method based on a single-lamp controller according to claim 1, characterized in that, The step of statistically analyzing all alarm data in the alarm database within a preset time window before receiving the flashing alarm data, and reporting the number of streetlights with flashing malfunctions and the number of streetlights with on-off flashing malfunctions, includes: Iterate through all the alarm data in the alarm database and filter out the alarm data whose timestamp is within the preset time window before the time when the flashing alarm data is received; The selected alarm data is iterated through, and the number of alarm data including those indicating flashing streetlight malfunction is counted as the number of light poles reporting flashing streetlight malfunction. The number of alarm data including those indicating on-off flashing streetlight malfunction is counted as the number of light poles reporting on-off flashing streetlight malfunction.

9. The street light flicker detection method based on a single-lamp controller according to claim 6, characterized in that, The backup power module's runtime minus the preset period is greater than or equal to 30 seconds.

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