An abnormal heat dissipation warning system for urban rail braking energy feedback devices

Abstract

The present invention proposes a heat dissipation abnormality warning system for an urban rail brake energy feedback device, which relates to the technical field of heat dissipation abnormality warning for a brake energy feedback device. The system monitors and collects data on the temperature at the air inlet where the brake energy feedback device is located, the wind speed at the air inlet, the current in the fan circuit, the blade speed on the fan, the temperature of the heat dissipation substrate of the brake energy feedback device, the temperature at the air outlet, and the wind speed at the air outlet in real time. The system performs all-round monitoring and analysis from the perspectives of the air inlet, the air duct, the fan itself, the heat dissipation substrate itself, and the air outlet. The collected data is transmitted to an early warning display platform, which is used to analyze the heat dissipation abnormality of the urban rail brake energy feedback device and provide an early warning display of the heat dissipation abnormality, thereby ensuring that operation and maintenance personnel can control the heat dissipation of the brake energy feedback device in real time, avoiding the occurrence of machine explosion due to heat dissipation abnormality when the brake energy feedback device is working, and ensuring the safety and stability of equipment operation.

Description

Technical Field

[0001] The present invention relates to the technical field of abnormal heat dissipation of a brake energy feedback device, and more particularly to an abnormal heat dissipation warning system for a brake energy feedback device of an urban rail transit. Background Art

[0002] In increasingly busy urban traffic, urban rail, with its advantages of large passenger capacity, high efficiency, and green energy conservation, has gradually become the primary solution to traffic congestion. To maintain its high speed and efficiency, urban rail trains must frequently accelerate and decelerate between short-distance urban rail stations. This deceleration and braking generates considerable energy. Braking energy regeneration devices can recycle this energy for reuse, making them a powerful aid in building green and energy-efficient urban rail.

[0003] A braking energy regeneration device absorbs regenerative braking energy from urban rail vehicles, converting it into AC power with the same frequency and phase as the grid voltage when it cannot be consumed by other vehicles or equipment. This device can handle regenerative energy while stabilizing the DC traction grid voltage. The core of a braking energy regeneration device is the high-power IGBT. Due to its operating characteristics, IGBTs generate significant heat. This accumulation of heat in a short period of time can damage the IGBT itself and even cause it to explode. Therefore, heat dissipation is a key research topic in energy regeneration device research.

[0004] The current mainstream IGBT cooling method primarily involves mounting the IGBT on a heat sink substrate and using a fan to cool and dissipate heat. For example, a prior art cooling system for the power module of a subway brake energy feedback device has been proposed. The system includes an IGBT power module, an NTC thermistor for measuring the temperature of the IGBT power module, a wind speed measurement device installed in the IGBT power module's cooling duct, a cooling fan installed in the cooling duct, and a current measurement device installed in the cooling fan circuit to measure the fan circuit current. Based on this composition, this solution can quickly detect various abnormalities in the power module cooling fan system and promptly upload them to the control system within milliseconds. The control system then issues an IGBT pulse blocking command, shutting down the IGBT and thus preventing the risk of explosion of the IGBT power module. The energy feedback device's operating cycle is directly related to the operation of the vehicles on the line. It generally starts operating when the contact line voltage reaches a certain threshold before the urban rail vehicle brakes before entering the station and stops operating when the contact line voltage drops, resulting in intermittent, cyclical operation. This operating condition causes the IGBT to reach megawatt-level power in a very short period of time. In other words, the IGBT temperature will rise rapidly within a very short period of time. Because it is an intermittent working mode, and considering the green and energy-saving design starting point of the energy feedback device, the cooling fan is often set to run at high power only when the IGBT is working. However, the staff has a blind spot in monitoring the changes in the temperature information of the cooling working condition. If the heat dissipation is abnormal, it may cause the risk of explosion of the IGBT power module, which is not conducive to ensuring the safety and stability of the equipment.

[0005] Furthermore, because PM10 dust and other pollutants are often present in substations, dust screens are installed at the air inlets of the fan ducts to prevent dust from entering the equipment. The performance of the energy-feedback device's heat dissipation system is directly related to the operating conditions of the IGBT module. Therefore, monitoring and analyzing the heat dissipation conditions can effectively reduce the risk of explosions. Summary of the Invention

[0006] To address the current problem of lack of real-time online monitoring and analysis of the heat dissipation conditions of energy feedback devices, the present invention proposes an urban rail brake energy feedback device heat dissipation anomaly warning system. This system analyzes possible anomalies in the heat dissipation of the urban rail brake energy feedback device based on temperature information, reminding operation and maintenance personnel to inspect and replace the equipment in a timely manner, avoiding the risk of explosion of the brake energy feedback device IGBT power module due to heat dissipation anomalies, and ensuring the safety and stability of equipment operation.

[0007] In order to achieve the above technical effects, the technical solutions of the present invention are as follows:

[0008] An urban rail braking energy feedback device heat dissipation abnormality warning system includes: an air inlet measurement and processing unit, a fan measurement and processing unit, a temperature measurement and processing unit provided on a heat dissipation substrate of the braking energy feedback device, an air outlet measurement and processing unit, a data collection unit, and a warning display platform;

[0009] The air inlet measurement and processing unit is used to measure and process the temperature at the air inlet and the wind speed at the air inlet; the fan measurement and processing unit is used to measure and process the current in the fan circuit and the blade speed on the fan; the temperature measurement and processing unit is used to measure and process the temperature of the heat dissipation substrate of the braking energy feedback device; the air outlet measurement and processing unit is used to measure and process the temperature at the air outlet and the wind speed at the air outlet; the data collection unit collects the temperature at the air inlet, the wind speed at the air inlet, the current in the fan circuit, the blade speed on the fan, the temperature of the heat dissipation substrate of the braking energy feedback device, the temperature at the air outlet and the wind speed at the air outlet, and transmits it to the early warning display platform. The early warning display platform analyzes the abnormal heat dissipation of the urban rail braking energy feedback device based on the received information, and displays an early warning of the abnormal heat dissipation.

[0010] This technical solution targets brake energy feedback devices equipped with fans and heat dissipation substrates. It can monitor and collect data online in real time on the temperature at the air inlet where the brake energy feedback device is located, the wind speed at the air inlet, the current in the fan circuit, the blade speed on the fan, the temperature of the heat dissipation substrate of the brake energy feedback device, the temperature at the air outlet, and the wind speed at the air outlet. It conducts comprehensive monitoring and analysis from the perspectives of the air inlet, air duct, fan itself, heat dissipation substrate itself, and air outlet. The collected data is transmitted to an early warning display platform, which is used to analyze abnormal heat dissipation conditions of the urban rail brake energy feedback device and display early warnings for abnormal heat dissipation conditions. The early warnings include abnormal air inlet ambient temperature, filter blockage warnings, abnormal aging warnings of the heat dissipation fan, abnormal air outlet warnings, heat dissipation substrate warnings, and abnormal temperature rise warnings of the brake energy feedback device. This ensures that operation and maintenance personnel can control the heat dissipation conditions of the brake energy feedback device in real time, avoid the occurrence of machine explosions due to abnormal heat dissipation when the brake energy feedback device is working, and ensure the safety and stability of equipment operation. This improves the efficiency of operation and maintenance management.

[0011] Preferably, the system also includes a communication unit, which receives the temperature at the air inlet, the wind speed at the air inlet, the current in the fan circuit, the blade speed on the fan, the temperature of the heat dissipation substrate of the braking energy feedback device, the temperature at the air outlet and the wind speed information data at the air outlet transmitted by the data collection unit, and then transmits the information to the early warning display platform.

[0012] Preferably, the early warning display platform is provided with an analysis and processing server and a display unit. The analysis and processing server analyzes and processes the received data information of the temperature at the air inlet, the wind speed at the air inlet, the current in the fan circuit, the blade speed on the fan, the temperature of the heat dissipation substrate of the braking energy feedback device, the temperature at the air outlet and the wind speed at the air outlet, and obtains the abnormal heat dissipation condition of the urban rail braking energy feedback device, and issues an early warning of the abnormal heat dissipation condition, which is transmitted to the display unit.

[0013] Preferably, the air inlet measurement processing unit includes:

[0014] A first temperature measurement and processing device installed at the air inlet, the first temperature measurement and processing device measures the current at different temperatures at the air inlet and processes the current into corresponding air inlet temperature data;

[0015] The first wind speed measurement and processing device is installed at the air inlet, and measures the wind pressure at the air inlet and processes the wind pressure into corresponding air inlet wind speed data.

[0016] Here, the first temperature measurement and processing device essentially includes a temperature measurement device and a temperature processing device. The temperature measurement device and the temperature processing device are used in conjunction with each other. When measuring the temperature, the temperature measurement device obtains the current at different temperatures at the air inlet, and then converts the current into corresponding air inlet temperature data through the temperature processing device; the first wind speed measurement and processing device essentially includes a wind speed measurement device and a wind speed processing device. The wind speed measurement device and the wind speed processing device are used in conjunction with each other. When measuring the temperature, the wind speed measurement device obtains the wind pressure at the air inlet, and the wind speed processing device processes the wind pressure into corresponding air inlet wind speed data.

[0017] Preferably, the wind turbine measurement processing unit includes:

[0018] A current measuring device, used to measure current data in a fan circuit of a fan installed at an air inlet;

[0019] The blade speed measuring device is used to measure the blade speed data of the fan installed at the air inlet.

[0020] Preferably, it is assumed that there are N substations equipped with braking energy feedback devices on the urban rail line, and the analysis and processing server of the early warning display platform receives the air inlet temperature data of different braking energy feedback devices of N substations, which is expressed as {T in1 ,T in2 ,…,T inN}, do the following:

[0021] S101. Set the air inlet temperature difference threshold to T in_max , let the air inlet temperature of the i-th braking energy feedback device in N substations be expressed as Tini , i=1,2,…,N, the mean inlet temperature is T in_avg ;

[0022] S102. The air inlet temperature T of the i-th braking energy feedback device is ini and the average inlet temperature T in_avg Make comparisons;

[0023] S103. If T ini -T in_avg ﹥T in_max , then the ambient temperature of the air inlet of the i-th braking energy feedback device is abnormal, and the analysis and processing server transmits the abnormal ambient temperature of the air inlet of the i-th braking energy feedback device to the display unit for early warning; if T ini -T in_avg ≤T in_max , return to S102.

[0024] Here, based on the temperature conditions at the air inlet, possible heat dissipation anomalies at the air inlet where the brake energy feedback device is located are analyzed, and the anomalies are transmitted to the display unit for early warning.

[0025] Preferably, the analysis and processing server of the early warning display platform receives the wind speed data of the air inlet measured and processed by the first wind speed measurement and processing device as WS1, and the current data in the fan circuit measured by the current measurement device as I raf The blade speed data measured by the blade speed measuring device is R ev ;

[0026] The analysis and processing server converts the current data I raf Convert to the corresponding wind speed WS2, that is, first calculate the fan power through the current data, then calculate the fan speed through the fan power, and then convert the speed into wind speed WS2, which is the wind speed corresponding to the existing current data when the air duct is normal; the analysis and processing server converts the blade speed data R ev Convert to the corresponding wind speed WS3, which is the wind speed corresponding to the fan blade speed when the air duct is normal, and then perform the following operations:

[0027] S201. The wind speed WS2 and wind speed WS3 are compared with the wind speed data WS1;

[0028] S202. If WS3≥WS1 or WS2≥WS1, the air duct has a cooling filter clogged, the analysis and processing server will issue a filter clogging warning and transmit the warning information to the display unit; otherwise, the air duct is operating normally, and step S203 is executed;

[0029] S203. Determine whether WS2 is greater than WS3. If so, the fan itself has defects. The analysis server will issue an abnormal aging fault warning of the fan and transmit the warning information to the display unit; otherwise, return to step S201.

[0030] Here, WS3 represents the wind speed corresponding to the fan blade speed when the air duct is normal, WS2 represents the wind speed corresponding to the existing current data when the air duct is normal, and WS1 represents the actual wind speed collected. Based on the wind speed, it is judged whether there are any abnormalities in the cooling fan and air duct used for the braking energy feedback device. If there are any abnormalities, a filter blockage warning and a fan abnormal aging failure warning will be issued to remind the operation and maintenance personnel to replace them in time, thereby further improving the reliability of equipment operation.

[0031] Preferably, the air outlet measurement processing unit includes:

[0032] A second temperature measurement and processing device installed at the air outlet measures the current at different temperatures at the air outlet and processes the current into corresponding temperature data;

[0033] The second wind speed measuring device is installed at the air outlet, and the second wind speed measurement and processing device measures the wind pressure at the air outlet and processes the wind pressure into corresponding wind speed data.

[0034] Preferably, it is assumed that there are N substations equipped with braking energy feedback devices on the urban rail line, and the analysis and processing server of the early warning display platform receives the outlet temperature data of different braking energy feedback devices of N substations, which is expressed as {T out1 ,T out2 ,…,T outN}, the received outlet wind speed data is WS4, perform the following operations:

[0035] S301. Set the outlet temperature difference threshold to T out_max , the wind speed difference threshold is WS out_max , let the outlet temperature of the i-th braking energy feedback device in N substations be expressed as T outi , i=1,2,…,N, the average outlet temperature is T out_avg ;

[0036] S302. The outlet temperature T of the i-th braking energy feedback device outi and the average outlet temperature T out_avg , compare wind speed WS3 with WS4;

[0037] S303. If T outi -T out_avg ﹥T out_max And the wind speed corresponding to the blade speed data is WS3-WS4>WS out_max, the ambient temperature of the air outlet of the i-th braking energy feedback device is abnormal and there is a possibility of blockage. The analysis and processing server transmits the abnormal ambient temperature and the possibility of blockage of the air outlet of the i-th braking energy feedback device to the display unit for early warning; otherwise, return to S302.

[0038] Here, the possible heat dissipation anomaly at the air outlet where the brake energy feedback device is located is analyzed based on the temperature and wind speed at the air outlet, and the anomaly is transmitted to the display unit for early warning.

[0039] Preferably, the temperature measurement processing unit provided on the heat dissipation substrate of the braking energy feedback device collects the temperature simulation data T on the heat dissipation substrate of the braking energy feedback device. igbt and its corresponding time point t igbt , uploaded to the early warning display platform through the data collection unit, the analysis and processing server of the early warning display platform converts the temperature simulation data T igbt and its corresponding time point t igbt Fit the temperature rise curve of the heat dissipation substrate of the braking energy feedback device and extract the fastest temperature rise rate in the temperature rise curve, that is, the maximum slope of the temperature rise curve Slope igbt_max The maximum value of the preset slope max For comparison, if Slope igbt_max ≤Slope max , the temperature rise of the heat dissipation substrate of the braking energy feedback device is normal; otherwise, the analysis and processing server transmits the result that there is an abnormality in the heat dissipation substrate of the braking energy feedback device or the braking energy feedback device itself to the display unit for early warning.

[0040] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0041] The present invention proposes a heat dissipation abnormality warning system for an urban rail brake energy feedback device, which monitors and collects data on the temperature at the air inlet where the brake energy feedback device is located, the wind speed at the air inlet, the current in the fan circuit, the blade speed on the fan, the temperature of the heat dissipation substrate of the brake energy feedback device, the temperature at the air outlet, and the wind speed at the air outlet in real time. It performs all-round monitoring and analysis from the perspectives of the air inlet, the air duct, the fan itself, the heat dissipation substrate itself, and the air outlet. The collected data is transmitted to an early warning display platform, which is used to analyze the heat dissipation abnormality of the urban rail brake energy feedback device and provide an early warning display of the heat dissipation abnormality, thereby ensuring that operation and maintenance personnel can control the heat dissipation of the brake energy feedback device in real time, avoiding the occurrence of machine explosion caused by heat dissipation abnormality when the brake energy feedback device is working, ensuring the safety and stability of equipment operation, and improving the efficiency of operation and maintenance management. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1A schematic diagram showing the structure of the abnormal heat dissipation warning system for the urban rail braking energy feedback device proposed in Example 1 of the present invention;

[0043] Figure 2 A schematic diagram showing a process for analyzing and processing a server to provide an early warning of heat dissipation anomalies at an air inlet, as proposed in Embodiment 2 of the present invention;

[0044] Figure 3 A schematic diagram showing a flow chart of analyzing and processing the server for heat dissipation abnormality warning for the air duct and the fan itself, as proposed in Example 2 of the present invention;

[0045] Figure 4 A schematic diagram showing a process of analyzing and processing a server to provide an early warning of abnormal heat dissipation at an air outlet, as proposed in Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0046] The accompanying drawings are for illustrative purposes only and are not to be construed as limiting this patent;

[0047] In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the actual size;

[0048] It is understandable to those skilled in the art that descriptions of certain well-known contents may be omitted in the drawings.

[0049] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0050] The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent;

[0051] Example 1

[0052] like Figure 1 As shown, this embodiment proposes a heat dissipation abnormality warning system for urban rail braking energy feedback device, see Figure 1 The system includes: an air inlet measurement and processing unit, a fan measurement and processing unit, a temperature measurement and processing unit located on a heat dissipation substrate of a braking energy feedback device, an air outlet measurement and processing unit, a data collection unit, and an early warning display platform;

[0053] Among them, the air inlet measurement processing unit is used to measure the temperature and wind speed at the air inlet; the fan measurement processing unit is used to measure the current in the fan circuit and the blade speed on the fan; the temperature measurement processing unit is used to measure the temperature of the heat dissipation substrate of the braking energy feedback device; the air outlet measurement processing unit is used to measure the temperature and wind speed at the air outlet;

[0054] like Figure 1As shown, structurally, the input end of the data collection unit is respectively connected to the air inlet measurement processing unit, the fan measurement processing unit, the temperature measurement processing unit provided on the heat dissipation substrate of the braking energy feedback device, and the air outlet measurement processing unit, and the temperature at the air inlet, the wind speed at the air inlet, the current in the fan circuit, the blade speed on the fan, the temperature of the heat dissipation substrate of the braking energy feedback device, the temperature at the air outlet and the wind speed at the air outlet are collected. The system also includes a communication unit, and the output end of the data collection unit is connected to the communication unit. The communication unit receives the information data of the temperature at the air inlet, the wind speed at the air inlet, the current in the fan circuit, the blade speed on the fan, the temperature of the heat dissipation substrate of the braking energy feedback device, the temperature at the air outlet and the wind speed at the air outlet transmitted by the output end of the data collection unit, and then transmits the information to the early warning display platform. The early warning display platform analyzes the abnormal heat dissipation of the urban rail braking energy feedback device according to the received information, and displays the abnormal heat dissipation.

[0055] like Figure 1 As shown, the early warning display platform is provided with an analysis and processing server and a display unit. The analysis and processing server analyzes and processes the received data information of the temperature at the air inlet, the wind speed at the air inlet, the current in the fan circuit, the blade speed on the fan, the temperature of the heat dissipation substrate of the braking energy feedback device, the temperature at the air outlet and the wind speed at the air outlet, and obtains the abnormal heat dissipation condition of the urban rail braking energy feedback device, and issues an early warning of the abnormal heat dissipation condition, which is transmitted to the display unit.

[0056] In this embodiment, the heat dissipation substrate of the brake energy regeneration device is the IGBT module heat sink. This embodiment, for a brake energy regeneration device equipped with a fan and a heat dissipation substrate, can monitor and aggregate data online in real time: the temperature at the air inlet where the brake energy regeneration device is located, the wind speed at the air inlet, the current in the fan circuit, the fan blade speed, the temperature of the brake energy regeneration device's heat dissipation substrate, the temperature at the air outlet, and the wind speed at the air outlet. Comprehensive monitoring and analysis is performed from the perspectives of the air inlet, air duct, fan itself, heat dissipation substrate itself, and air outlet. The aggregated data is transmitted to an early warning display platform, which analyzes abnormal heat dissipation conditions of the urban rail brake energy regeneration device and displays early warnings of these conditions. These warnings include abnormal air inlet ambient temperature, filter blockage, abnormal cooling fan aging, air outlet abnormality, heat dissipation substrate warning, and abnormal temperature rise of the brake energy regeneration device. This ensures that operation and maintenance personnel can monitor the heat dissipation of the brake energy regeneration device in real time, preventing the brake energy regeneration device from experiencing a heat dissipation failure, thereby ensuring safe and stable equipment operation. This improves operation and maintenance management efficiency.

[0057] Example 2

[0058] In this embodiment, the air inlet measurement processing unit includes:

[0059] A first temperature measurement and processing device installed at the air inlet, the first temperature measurement and processing device measures the current at different temperatures at the air inlet and processes the current into corresponding air inlet temperature data;

[0060] The first wind speed measurement and processing device is installed at the air inlet, and measures the wind pressure at the air inlet and processes the wind pressure into corresponding air inlet wind speed data.

[0061] The first temperature measurement and processing device essentially includes a temperature measurement device and a temperature processing device. The temperature measurement device and the temperature processing device are used in conjunction with each other. When measuring the temperature, the temperature measurement device obtains the current at different temperatures at the air inlet, and then converts the current into corresponding air inlet temperature data through the temperature processing device; the first wind speed measurement and processing device essentially includes a wind speed measurement device and a wind speed processing device. The wind speed measurement device and the wind speed processing device are used in conjunction with each other. When measuring the temperature, the wind speed measurement device obtains the wind pressure at the air inlet, and the wind speed processing device processes the wind pressure into corresponding air inlet wind speed data.

[0062] In this embodiment, the wind turbine measurement processing unit includes:

[0063] A current measuring device, used to measure current data in a fan circuit of a fan installed at an air inlet;

[0064] The blade speed measuring device is used to measure the blade speed data of the fan installed at the air inlet.

[0065] Combining the functions of the air outlet measurement and processing unit and the fan measurement and processing unit, the analysis and processing server analyzes the possible heat dissipation anomalies at the air inlet where the braking energy feedback device is located based on the temperature conditions at the air inlet, and transmits the anomalies to the display unit for early warning.

[0066] Assume that there are N substations equipped with braking energy feedback devices on the urban rail line. The analysis and processing server of the early warning display platform receives the air inlet temperature data of different braking energy feedback devices of N substations, which is expressed as {T in1 ,T in2 ,…,T inN}, execute as Figure 2 The following operations are shown:

[0067] S101. Set the air inlet temperature difference threshold to T in_max , let the air inlet temperature of the i-th braking energy feedback device in N substations be expressed as T ini , i=1,2,…,N, the mean inlet temperature is T in_avg ;

[0068] S102. The air inlet temperature T of the i-th braking energy feedback device is ini and the average inlet temperature T in_avg Make comparisons;

[0069] S103. If T ini -T in_avg ﹥T in_max , then the ambient temperature of the air inlet of the i-th braking energy feedback device is abnormal, and the analysis and processing server transmits the abnormal ambient temperature of the air inlet of the i-th braking energy feedback device to the display unit for early warning; if T ini -T in_avg ≤T in_max , return to S102.

[0070] Assume that the wind speed data of the air inlet measured and processed by the first wind speed measurement and processing device received by the analysis and processing server of the early warning display platform is WS1, and the current data in the fan circuit measured by the current measurement device is I raf The blade speed data measured by the blade speed measuring device is R ev ;

[0071] The analysis and processing server converts the current data I raf Convert to the corresponding wind speed WS2, that is, first calculate the fan power through the current data, then calculate the fan speed through the fan power, and then convert the speed into wind speed WS2, which is the wind speed corresponding to the existing current data when the air duct is normal; the analysis and processing server converts the blade speed data R ev Converted to the corresponding wind speed WS3, which is the wind speed corresponding to the fan blade speed when the air duct is normal. According to the wind speed, it is judged whether there is any abnormality in the cooling fan and the air duct used for the brake energy feedback device. If it is abnormal, a filter blockage warning and a fan abnormal aging fault warning are issued, and the execution Figure 3 The following operations are shown:

[0072] S201. The wind speed WS2 and wind speed WS3 are compared with the wind speed data WS1;

[0073] S202. If WS3≥WS1 or WS2≥WS1, the air duct has a cooling filter clogged, the analysis and processing server will issue a filter clogging warning and transmit the warning information to the display unit; otherwise, the air duct is operating normally, and step S203 is executed;

[0074] S203. Determine whether WS2 is greater than WS3. If so, the fan itself has defects. The analysis server will issue an abnormal aging fault warning of the fan and transmit the warning information to the display unit; otherwise, return to step S201.

[0075] When the early warning display platform discovers the situation proposed in this embodiment, the early warning information and the reasons for the possible temperature anomaly are immediately displayed on the display screen.

[0076] Example 3

[0077] In this embodiment, the air outlet measurement processing unit includes:

[0078] A second temperature measurement and processing device installed at the air outlet measures the current at different temperatures at the air outlet and processes the current into corresponding temperature data;

[0079] The second wind speed measuring device is installed at the air outlet, and the second wind speed measurement and processing device measures the wind pressure at the air outlet and processes the wind pressure into corresponding wind speed data.

[0080] like Figure 4 As shown in the figure, suppose there are N substations equipped with braking energy feedback devices on the urban rail line. The analysis and processing server of the early warning display platform receives the outlet temperature data of different braking energy feedback devices of N substations, which is expressed as {T out1 ,T out2 ,…,T outN}, the received outlet wind speed data is WS4, perform the following operations:

[0081] S301. Set the outlet temperature difference threshold to T out_max , the wind speed difference threshold is WS out_max , let the outlet temperature of the i-th braking energy feedback device in N substations be expressed as T outi , i=1,2,…,N, the average outlet temperature is T out_avg ;

[0082] S302. The outlet temperature T of the i-th braking energy feedback device outi and the average outlet temperature T in_avg , compare wind speed WS3 with WS4;

[0083] S303. If T outi -T out_avg ﹥T out_max And the wind speed corresponding to the blade speed data is WS3-WS4>WS out_max , the ambient temperature of the air outlet of the i-th braking energy feedback device is abnormal and there is a possibility of blockage. The analysis and processing server transmits the abnormal ambient temperature and the possibility of blockage of the air outlet of the i-th braking energy feedback device to the display unit for early warning; otherwise, return to S302.

[0084] This embodiment analyzes the possible heat dissipation anomaly at the air outlet where the brake energy feedback device is located based on the temperature and wind speed at the air outlet, and transmits the anomaly to the display unit for early warning.

[0085] When the early warning display platform discovers the situation proposed in this embodiment, the early warning information and the reasons for the possible temperature anomaly are immediately displayed on the display screen.

[0086] Example 4

[0087] In this embodiment, the heat dissipation substrate of the braking energy feedback device is an IGBT module heat sink, and the temperature measurement processing unit provided on the heat dissipation substrate of the braking energy feedback device collects the temperature simulation data T on the heat dissipation substrate of the braking energy feedback device. igbt and its corresponding time point t igbt , uploaded to the early warning display platform through the data collection unit, the analysis and processing server of the early warning display platform converts the temperature simulation data T igbt and its corresponding time point t igbt Fit the temperature rise curve of the heat dissipation substrate of the braking energy feedback device and extract the fastest temperature rise rate in the temperature rise curve, that is, the maximum slope of the temperature rise curve Slope igbt_max The maximum value of the preset slope max For comparison, if Slope igbt_max ≤Slope max , the temperature rise of the heat dissipation substrate of the braking energy feedback device is normal; otherwise, the analysis and processing server transmits the result that there is an abnormality in the heat dissipation substrate of the braking energy feedback device or the braking energy feedback device itself to the display unit for early warning.

[0088] When the early warning display platform discovers the situation proposed in this embodiment, the early warning information and the reasons for the possible temperature anomaly are immediately displayed on the display screen.

[0089] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An urban rail braking energy feedback device heat dissipation abnormality warning system, characterized in that: include: An air inlet measurement and processing unit, a fan measurement and processing unit, a temperature measurement and processing unit located on a heat dissipation substrate of a braking energy feedback device, an air outlet measurement and processing unit, a data collection unit, and an early warning display platform; the early warning display platform is provided with an analysis and processing server and a display unit; The air inlet measurement and processing unit is used to measure and process the temperature at the air inlet and the wind speed at the air inlet; the fan measurement and processing unit is used to measure and process the current in the fan circuit and the blade speed on the fan; the temperature measurement and processing unit is used to measure and process the temperature of the heat dissipation substrate of the braking energy feedback device; the air outlet measurement and processing unit is used to measure and process the temperature at the air outlet and the wind speed at the air outlet; the data collection unit collects the data information of the temperature at the air inlet, the wind speed at the air inlet, the current in the fan circuit, the blade speed on the fan, the temperature of the heat dissipation substrate of the braking energy feedback device, the temperature at the air outlet and the wind speed at the air outlet, and transmits it to the early warning display platform, which analyzes the abnormal heat dissipation of the urban rail braking energy feedback device based on the received information and displays the abnormal heat dissipation. The temperature measurement processing unit provided on the heat dissipation substrate of the braking energy feedback device collects the temperature simulation data T on the heat dissipation substrate of the braking energy feedback device. igbt and its corresponding time point t igbt , uploaded to the early warning display platform through the data collection unit, the analysis and processing server of the early warning display platform converts the temperature simulation data T igbt and its corresponding time point t igbt Fit the temperature rise curve of the heat dissipation substrate of the braking energy feedback device and extract the fastest temperature rise rate in the temperature rise curve, that is, the maximum slope of the temperature rise curve Slope igbt_max The maximum value of the preset slope max For comparison, if Slope igbt_max ≤Slope max , the temperature rise of the heat dissipation substrate of the braking energy feedback device is normal; otherwise, the analysis and processing server transmits the result that there is an abnormality in the heat dissipation substrate of the braking energy feedback device or the braking energy feedback device itself to the display unit for early warning.

2. The urban rail braking energy feedback device heat dissipation abnormality warning system according to claim 1 is characterized in that: The system also includes a communication unit, which receives the temperature at the air inlet, the wind speed at the air inlet, the current in the fan circuit, the blade speed on the fan, the temperature of the heat dissipation substrate of the braking energy feedback device, the temperature at the air outlet and the wind speed at the air outlet transmitted by the data collection unit, and then transmits the information to the early warning display platform.

3. The urban rail braking energy feedback device heat dissipation abnormality warning system according to claim 1 is characterized in that: The analysis and processing server analyzes and processes the received data information on the temperature at the air inlet, the wind speed at the air inlet, the current in the fan circuit, the blade speed on the fan, the temperature of the heat dissipation substrate of the braking energy feedback device, the temperature at the air outlet and the wind speed at the air outlet, and obtains the abnormal heat dissipation condition of the urban rail braking energy feedback device, and issues an early warning of the abnormal heat dissipation condition, which is then transmitted to the display unit.

4. The urban rail braking energy feedback device heat dissipation abnormality warning system according to claim 3 is characterized in that: The air inlet measurement processing unit includes: A first temperature measurement and processing device installed at the air inlet, the first temperature measurement and processing device measures the current at different temperatures at the air inlet and processes the current into corresponding air inlet temperature data; The first wind speed measurement and processing device is installed at the air inlet, and measures the wind pressure at the air inlet and processes the wind pressure into corresponding air inlet wind speed data.

5. The urban rail braking energy feedback device heat dissipation abnormality warning system according to claim 4 is characterized in that: The wind turbine measurement processing unit includes: A current measuring device, used to measure current data in a fan circuit of a fan installed at an air inlet; The blade speed measuring device is used to measure the blade speed data of the fan installed at the air inlet.

6. The urban rail braking energy feedback device heat dissipation abnormality warning system according to claim 4 is characterized in that: Assume that there are N substations equipped with braking energy feedback devices on the urban rail line. The analysis and processing server of the early warning display platform receives the air inlet temperature data of different braking energy feedback devices of N substations, which is expressed as {T in1 ,T in2 ,…,T inN }, do the following: S101. Set the air inlet temperature difference threshold to T in_max , let the air inlet temperature of the i-th braking energy feedback device in N substations be expressed as T ini , i=1,2,…,N, the mean inlet temperature is T in_avg ; S102. The air inlet temperature T of the i-th braking energy feedback device is ini and the average inlet temperature T in_avg Make comparisons; S103. If T ini -T in_avg ﹥T in_max , then the ambient temperature of the air inlet of the i-th braking energy feedback device is abnormal, and the analysis and processing server transmits the abnormal ambient temperature of the air inlet of the i-th braking energy feedback device to the display unit for early warning; if T ini -T in_avg ≤T in_max , return to S102.

7. The urban rail braking energy feedback device heat dissipation abnormality warning system according to claim 5 is characterized in that: Assume that the wind speed data of the air inlet measured and processed by the first wind speed measurement and processing device received by the analysis and processing server of the early warning display platform is WS1, and the current data in the fan circuit measured by the current measurement device is I raf The blade speed data measured by the blade speed measuring device is R ev ; The analysis and processing server converts the current data I raf Convert to the corresponding wind speed WS2, that is, first calculate the fan power through the current data, then calculate the fan speed through the fan power, and then convert the speed into wind speed WS2, which is the wind speed corresponding to the existing current data when the air duct is normal; The analysis and processing server converts the blade speed data R ev Convert to the corresponding wind speed WS3, which is the wind speed corresponding to the fan blade speed when the air duct is normal, and then perform the following operations: S201. The wind speed WS2 and wind speed WS3 are compared with the wind speed data WS1; S202. If WS3≥WS1 or WS2≥WS1, the air duct has a cooling filter clogged, the analysis and processing server will issue a filter clogging warning and transmit the warning information to the display unit; otherwise, the air duct is operating normally, and step S203 is executed; S203 determines whether WS2 is greater than WS3. If so, the fan itself has defects. The analysis server will issue an abnormal aging fault warning of the fan and transmit the warning information to the display unit. Otherwise, return to step S201.

8. The urban rail braking energy feedback device heat dissipation abnormality warning system according to claim 7 is characterized in that: The air outlet measurement processing unit includes: A second temperature measurement and processing device installed at the air outlet measures the current at different temperatures at the air outlet and processes the current into corresponding temperature data; The second wind speed measuring device is installed at the air outlet, and the second wind speed measurement and processing device measures the wind pressure at the air outlet and processes the wind pressure into corresponding wind speed data.

9. The urban rail braking energy feedback device heat dissipation abnormality warning system according to claim 8 is characterized in that: Assume that there are N substations equipped with braking energy feedback devices on the urban rail line. The analysis and processing server of the early warning display platform receives the outlet temperature data of different braking energy feedback devices of N substations, which is expressed as {T out1 ,T out2 ,…,T outN }, the received outlet wind speed data is WS4, perform the following operations: S301. Set the outlet temperature difference threshold to T out_max , the wind speed difference threshold is WS out_max , let the outlet temperature of the i-th braking energy feedback device in N substations be expressed as T outi , i=1,2,…,N, the average outlet temperature is T out_avg ; S302. The outlet temperature T of the i-th braking energy feedback device outi and the average outlet temperature T out_avg , compare wind speed WS3 with WS4; S303. If T outi -T out_avg ﹥T out_max And the wind speed corresponding to the blade speed data is WS3-WS4>WS out_max , then the ambient temperature of the air outlet of the i-th brake energy regenerative device is abnormal and there is a possibility of blockage, the analysis and processing server transmits the abnormal ambient temperature of the air outlet of the i-th brake energy regenerative device and the possibility of blockage to the display unit for early warning; Otherwise, return to S302.

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