Real-time monitoring method and system of platform door power supply system

Abstract

The invention discloses a real-time monitoring method and system for a platform door power supply system, and the method comprises the steps: collecting the voltage, temperature and internal resistance of the platform door power supply system, diagnosing whether the platform door power supply system breaks down or not according to a set threshold value, and transmitting alarm information when the voltage, temperature and internal resistance are not within the threshold value range; on the basis of real-time monitoring and response to system state changes, the voltage and temperature acquisition frequency is intelligently adjusted, it is ensured that the acquisition density is improved when equipment is abnormal, and the acquisition frequency is reduced when the equipment is stable so as to save resources. And timely data acquisition of the power supply system is considered, and resource waste caused by too high acquisition frequency or occupation of system resources of the monitoring and diagnosis system due to invalid data analysis of data generated by fixed acquisition frequency is avoided.

Description

Technical Field

[0001] The present invention relates to the field of rail transit automation, and in particular to a real-time monitoring method and system for a platform door power supply system. Background Art

[0002] Platform doors are the main equipment for people to enter and exit subway vehicles. They require uninterrupted power supply. If the power system fails, it is easy to cause abnormal operation of the subway line and even threaten the safety of passengers. How to know the power system failure in real time and guide the maintenance of the power system has become an important research topic.

[0003] The existing power supply system collects battery voltage, temperature and other indicators at a fixed frequency. This simple and crude method either results in a large amount of invalid data that increases the pressure of data analysis, or in an emergency where sufficient data cannot be collected in time for analysis. At the same time, due to geographical restrictions, station personnel cannot understand the current operating status of the power supply system in real time. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a real-time monitoring method and system for a platform door power supply system that can intelligently adjust the power supply system acquisition frequency, to ensure that the acquisition density is increased when the equipment is abnormal, and the acquisition frequency is reduced to save resources when the equipment is stable.

[0005] Technical solution: The real-time monitoring method of the platform door power supply system of the present invention collects the voltage of the platform door power supply system, diagnoses whether the platform door power supply system is faulty according to a set threshold, and issues an alarm message when the voltage is not within the threshold range;

[0006] Voltage acquisition frequency f sample，V According to the current voltage V(t) and voltage change rate V'(t) of the platform door power supply system, set:

[0007]

[0008] Among them, [V min ,V nom ] is the safe operating range of voltage, V warn,l is the lower limit alarm voltage, V warn,l is the upper limit alarm voltage, f avg，V is a constant, k is a proportional constant, f min，V and f max，V They are the lowest and highest voltage acquisition frequencies that are set respectively.

[0009] Furthermore, in the safe operating range of the voltage, V min =μ-q·σ, V nom=μ+q·σ; where μ is the voltage mean value calculated by collecting voltage N times, σ is the voltage standard deviation calculated by collecting voltage N times, and q is a constant;

[0010] After each acquisition of the voltage of the platform door power supply system, the safe operating range is updated.

[0011] Furthermore, the platform door power supply system includes a battery, and the voltage is collected N times in a floating charge state of the battery to calculate a voltage mean and a voltage standard deviation.

[0012] Furthermore, the method also includes collecting the temperature of the platform door power supply system, diagnosing whether the platform door power supply system is faulty according to a set threshold, and issuing an alarm message when the temperature is not within the threshold range.

[0013] Furthermore, the temperature sampling frequency f sample，T for:

[0014]

[0015] Among them, f min，T and f max，T are the lowest temperature sampling frequency and the highest temperature sampling frequency respectively, and M is the sampling factor.

[0016] Furthermore, the method also includes collecting the internal resistance of the platform door power supply system, diagnosing whether the platform door power supply system is faulty according to a set threshold value, and issuing an alarm message when the internal resistance is not within the threshold range.

[0017] The real-time monitoring system of the platform door power supply system of the present invention comprises:

[0018] A collection unit, used to collect the voltage of the platform door power supply system;

[0019] A diagnostic unit, used to diagnose whether the platform door power supply system is faulty according to a set threshold value, and to issue an alarm message when the voltage is not within its threshold range;

[0020] The frequency modulation unit is used to adjust the sampling frequency, the voltage acquisition frequency f sample，V According to the current voltage V(t) and voltage change rate V'(t) of the platform door power supply system, set:

[0021]

[0022] Among them, [V min ,V nom ] is the safe operating range of voltage, V warn,l is the lower limit alarm voltage, V warn,u is the upper limit alarm voltage, f avg，V is a constant, k is a proportional constant, f min，Vand f max，V They are the lowest and highest voltage acquisition frequencies that are set respectively.

[0023] Furthermore, the acquisition unit is also used to collect the temperature and internal resistance of the platform door power supply system;

[0024] The diagnostic unit is also used to diagnose whether the platform door power supply system is faulty according to the set temperature threshold and internal resistance threshold, and issue an alarm message when the temperature or internal resistance is not within the threshold range;

[0025] The frequency modulation unit also includes updating the safe working range after collecting the voltage of the platform door power supply system each time; in the safe working range of the voltage, V min =μ-q·σ, V nom =μ+q·σ; where μ is the voltage mean value calculated by collecting voltage N times, σ is the voltage standard deviation calculated by collecting voltage N times, and q is a constant;

[0026] The temperature sampling frequency f sample，T for:

[0027]

[0028] Among them, f min，T and f max，T are the lowest temperature sampling frequency and the highest temperature sampling frequency respectively, and M is the sampling factor.

[0029] The electronic device described in the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded into the processor, the real-time monitoring method of the platform door power supply system is implemented.

[0030] The computer-readable storage medium of the present invention stores a computer program, and is characterized in that when the computer program is executed by a processor, the real-time monitoring method of the platform door power supply system is implemented.

[0031] Beneficial effects: Compared with the prior art, the advantages of the present invention are: (1) The present invention intelligently adjusts the voltage acquisition frequency according to the battery voltage and voltage change rate, ensuring that the acquisition density is increased when the data changes significantly, and the acquisition frequency is reduced to save resources when the data is stable. It takes into account the timely data acquisition of the power supply system and avoids the waste of resources caused by too high an acquisition frequency or the invalid data analysis of the data generated by the fixed acquisition frequency occupying the system resources of the monitoring and diagnosis system. (2) The present invention intelligently adjusts the threshold of the stable working voltage of the battery, determines a dynamic threshold through statistical analysis, more accurately reflects the actual condition of the battery, and better adapts to the operating state of the battery under different conditions. (3) The present invention intelligently adjusts the temperature acquisition frequency to ensure that the signal details can be accurately captured and the monitoring requirements can be met even in the case of low-frequency changes. (4) The present invention breaks through the geographical location restrictions, so that users who access the service can understand the real-time status of the power supply system at the first time, so that they can discover and deal with problems in a timely manner. Through this system, the power supply system can be unattended, reducing the cost of subway operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a flow chart of the real-time monitoring method of the present invention;

[0033] Figure 2 A voltage threshold update flow chart of an embodiment of the present invention;

[0034] Figure 3 Schematic diagram of a voltage acquisition piecewise function according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0036] like Figure 1 The figure shows a schematic diagram of the real-time monitoring method of the present invention, which includes three parts: a platform door power supply system, a collection system, and a monitoring and diagnosis system. The platform door power supply system is generally composed of a driving power supply and a control power supply, wherein the driving power supply supplies power to the platform door drive, and the control power supply supplies power to the platform door controller, sensor, signal processor and other electronic devices. The collection system includes an acquisition module and a data processing module; the monitoring and diagnosis system includes a device gateway, an analysis and diagnosis module, an application service and a NAT service. The analysis and diagnosis module includes an intelligent frequency modulation unit and an intelligent diagnosis unit. The collection system and the monitoring and diagnosis system transmit data via the TCP / IP protocol.

[0037] The method of the present invention comprises the following steps:

[0038] 1. Collection stage:

[0039] S1: The acquisition system transmits the voltage, temperature, internal resistance and ambient temperature data of the battery pack in the platform door power supply system to the data processing module through the acquisition module.

[0040] S2: After receiving the voltage, temperature, internal resistance and ambient temperature data, the data processing module encapsulates the data and transmits it to the monitoring and diagnosis system.

[0041] S3: The device gateway receives data from the collection system through a reliable communication strategy, parses the data according to a private protocol, and transmits it to the application service.

[0042] S4: The application service stores the power supply data and triggers intelligent diagnosis.

[0043] 2. Intelligent diagnosis stage:

[0044] S5: After receiving the battery data from the application service, the analysis and diagnosis module performs threshold diagnosis on the voltage, temperature, internal resistance and ambient temperature.

[0045] S6: Perform threshold diagnosis on the battery internal resistance. The internal resistance is generally between 2 and 3 milliohms (mΩ). The internal resistance of a healthy 12V lead-acid battery can be lower than 25mΩ. The internal resistance is related to the brand and capacity of the battery. The parameters here can be set in combination with the specific battery. If it exceeds the range, an abnormal internal resistance value warning is issued. Since the internal resistance of the battery changes little in a short period of time, the internal resistance collection period of this embodiment is set to once a day, and there is no need to adjust the collection frequency of the internal resistance.

[0046] S7: Perform threshold diagnosis on ambient temperature and battery temperature. The temperature threshold is set to 25℃±5℃. When the temperature is not within the threshold range, a temperature alarm is issued. After threshold diagnosis, intelligent frequency modulation is triggered.

[0047] S8: The voltage is also diagnosed by threshold value. The voltage threshold value needs to be set differently in combination with the battery status parameters. The battery status can be divided into fully charged state, static state, use state, charging process state, and floating charge state. The initial threshold values ​​of each state are shown in the table:

[0048] Table 1

[0049] Battery Status Minimum voltage (V) Maximum voltage(V) Fully charged 12.9 14.4 Static state 12.6 12.8 Use Status 10.5 12 Charging process status 14.4 15 Float charge status 13.2 13.8

[0050] After collecting battery voltage data for a period of time in the floating charge state, outliers and invalid data are removed through data preprocessing, and the mean (μ) and standard deviation (σ) of the voltage data are calculated. The formula is as follows

[0051]

[0052] Among them, V iRepresents the voltage value measured for the i-th time, and N represents the total number of samples. A dynamic threshold is set based on statistics, using the mean plus or minus several times the standard deviation as the threshold. The formula is as follows:

[0053] V min =μ-q·σ, V nom =μ+q·σ;

[0054] Where q is a constant, usually 2 or 3, which means that the threshold will be set at q standard deviations above or below the mean.

[0055] A new threshold is calculated immediately after each voltage data update, and the new threshold is used as the safe working voltage parameter of intelligent frequency modulation. Figure 2 shown.

[0056] 3. Intelligent frequency modulation stage:

[0057] S9: According to the temperature diagnosis results, the sampling factor is adjusted according to the acquisition formula to generate a new acquisition frequency. The specific temperature intelligent adjustment acquisition frequency is described as follows:

[0058] There is an impact between the ambient temperature and the battery temperature, so an interval sampling strategy is adopted. For the battery of an uninterruptible power supply (UPS) or backup power supply, the temperature sampling frequency may not need to be so high. The default setting is once every 5 minutes. Formula example:

[0059]

[0060] where f sample，T is the number of temperature sampling times within 5 minutes, f max，T The maximum frequency of temperature acquisition is 60, that is, the acquisition is performed once every 10 seconds at most; M is the sampling factor during signal processing, which is between 2 and 30 to ensure that the signal details can be accurately captured; f min，T is the minimum allowed sampling frequency, ensuring that monitoring requirements can be met even in low-frequency changes. Here it is 1. The initial sampling factor M is 30. When a temperature alarm occurs, the sampling factor will be changed to 15. If the alarm still occurs, the sampling factor is 5, and the alarm is finally changed to 2. Therefore, when the alarm continues to occur, it will eventually take 75s+25s+10s=110s, that is, it will take 110 seconds to adjust the sampling frequency from once every 5 minutes to once every 10 seconds. Similarly, when the temperature returns to normal, it will take 110 seconds to return to the minimum sampling frequency.

[0061] S10: Voltage acquisition needs to be combined with the battery status. As the battery in the platform door power supply system, its main function is UPS uninterruptible power supply. The battery is usually in floating charge state. The calculation formula is as follows:

[0062]

[0063] This formula is a piecewise function f(V(t), V'(t)), and the acquisition frequency depends on the current battery voltage V(t) and the voltage change rate V'(t), where f sample，V is the number of voltage sampling times within 1 minute, as shown in the schematic diagram Figure 3 shown.

[0064] If the battery voltage V(t) is within the safe operating range, that is, V min and V nom The acquisition frequency is f min，V , f min，V Set to 1, V min and V nom The voltage range during floating charge is set to an initial value of 13.2V to 13.8V, and is adjusted accordingly according to the dynamic threshold in step S8.

[0065] If the battery voltage V(t) is less than or equal to the lower limit warning voltage V warn,l Or greater than or equal to the upper line alarm voltage V warn,u , the acquisition frequency is f max，V , f max，V Set to 60, V warn，l Set to 10.5V, V warn，u Set to 14.4V.

[0066] In all other cases, the acquisition frequency is f avg，V +k·|V'(t)|, where k is a proportional constant and V'(t) is the voltage change rate. The greater the voltage change rate, the higher the sampling frequency. avg，V It is set to 30, and the specific value of k needs to be determined according to the specific battery model, usage environment and performance of the monitoring system to find the best balance point. In this embodiment, it is set to 30.

[0067] S11: The new collection frequency provides services through the application service to transmit data to the device gateway.

[0068] S12: The device gateway packages the data and transmits it to the data processing module of the acquisition system.

[0069] S13: The data processing module adjusts the data acquisition frequency of the acquisition module to complete the entire intelligent frequency modulation process.

[0070] The real-time monitoring system of the platform door power supply system of the present invention comprises:

[0071] A collection unit, used to collect the voltage of the platform door power supply system;

[0072] A diagnostic unit, used to diagnose whether the platform door power supply system is faulty according to a set threshold value, and to issue an alarm message when the voltage is not within its threshold range;

[0073] The frequency modulation unit is used to adjust the sampling frequency, the voltage acquisition frequency f sample，V According to the current voltage V(t) and voltage change rate V'(t) of the platform door power supply system, set:

[0074]

[0075] Among them, [V min ,V nom ] is the safe operating range of voltage, V warn,l is the lower limit alarm voltage, V warn,u is the upper limit alarm voltage, f avg，V is a constant, k is a proportional constant, f min，V and f max，V They are the lowest and highest voltage acquisition frequencies that are set respectively.

[0076] The electronic device described in the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded into the processor, the real-time monitoring method of the platform door power supply system is implemented.

[0077] The computer-readable storage medium of the present invention stores a computer program, and is characterized in that when the computer program is executed by a processor, the real-time monitoring method of the platform door power supply system is implemented.

[0078] The computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, flash memory, or any other medium that can be used to store the desired program code in the form of instructions or data structures and that can be accessed by a computer.

[0079] The processor is used to execute the computer program stored in the memory to implement each step of the method involved in the above embodiment.

Claims

1. A real-time monitoring method for a platform door power supply system, characterized in that: Collect the voltage of the platform door power supply system, diagnose whether the platform door power supply system is faulty according to the set threshold, and issue an alarm message when the voltage is not within the threshold range; Voltage acquisition frequency f sample，V According to the current voltage V(t) and voltage change rate V'(t) of the platform door power supply system, set: Among them, [V min ,V nom ] is the safe operating range of voltage, V warn,l is the lower limit alarm voltage, V warn,u is the upper limit alarm voltage, f avg，V is a constant, k is a proportional constant, f min，V and f max，V They are the lowest and highest voltage acquisition frequencies that are set respectively.

2. The real-time monitoring method of the platform door power supply system according to claim 1 is characterized in that: In the safe operating range of the voltage, V min =μ-q·σ, V nom =μ+q·σ; Where μ is the voltage mean calculated by collecting voltage N times, σ is the voltage standard deviation calculated by collecting voltage N times, and q is a constant; After each acquisition of the voltage of the platform door power supply system, the safe operating range is updated.

3. The real-time monitoring method of the platform door power supply system according to claim 2, characterized in that: The platform door power supply system includes a battery, and the voltage is collected N times in a floating charge state of the battery to calculate a voltage mean and a voltage standard deviation.

4. The real-time monitoring method of the platform door power supply system according to claim 1, characterized in that: The method further includes collecting the temperature of the platform door power supply system, diagnosing whether the platform door power supply system is faulty according to a set threshold value, and issuing an alarm message when the temperature is not within the threshold range.

5. The real-time monitoring method of the platform door power supply system according to claim 4, characterized in that: The temperature sampling frequency f sample，T for: Among them, f min，T and f max，T are the lowest temperature sampling frequency and the highest temperature sampling frequency respectively, and M is the sampling factor.

6. The real-time monitoring method of the platform door power supply system according to claim 1, characterized in that: The method further includes collecting the internal resistance of the platform door power supply system, diagnosing whether the platform door power supply system is faulty according to a set threshold value, and issuing an alarm message when the internal resistance is not within the threshold range.

7. A real-time monitoring system for a platform door power supply system, characterized in that: include: A collection unit, used to collect the voltage of the platform door power supply system; A diagnostic unit, used to diagnose whether the platform door power supply system is faulty according to a set threshold value, and to issue an alarm message when the voltage is not within its threshold range; The frequency modulation unit is used to adjust the sampling frequency, the voltage acquisition frequency f sample，V According to the current voltage V(t) and voltage change rate V'(t) of the platform door power supply system, set: Among them, [V min ,V nom ] is the safe operating range of voltage, V warn,l is the lower limit alarm voltage, V warn,u is the upper limit alarm voltage, f avg，V is a constant, k is a proportional constant, f min，V and f max，V They are the lowest and highest voltage acquisition frequencies that are set respectively.

8. The real-time monitoring system for platform door power supply system according to claim 7, characterized in that: The acquisition unit is also used to collect the temperature and internal resistance of the platform door power supply system; The diagnostic unit is also used to diagnose whether the platform door power supply system is faulty according to the set temperature threshold and internal resistance threshold, and issue an alarm message when the temperature or internal resistance is not within the threshold range; The frequency modulation unit also includes, after each acquisition of the voltage of the platform door power supply system, updating the safe working range; in the safe working range of the voltage, V min =μ-q·σ, V nom =μ+q·σ; where μ is the voltage mean value calculated by collecting voltage N times, σ is the voltage standard deviation calculated by collecting voltage N times, and q is a constant; The temperature sampling frequency f sample，T for: Among them, f min，T and f max，T are the lowest temperature sampling frequency and the highest temperature sampling frequency respectively, and M is the sampling factor.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the computer program is loaded into the processor, the real-time monitoring method of the platform door power supply system according to any one of claims 1-6 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by the processor, the real-time monitoring method of the platform door power supply system according to any one of claims 1-6 is implemented.

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