Real-time temperature measurement system for air-cooled generator bearing

Abstract

The invention relates to the technical field of generator bearing temperature monitoring, in particular to a real-time temperature measurement system for an air-cooled generator bearing, which comprises a first temperature measurement module, a second temperature measurement module, a temperature control module and a temperature control module, the first image data is used for representing temperature distribution characteristics of the air-cooled generator bearing; the second temperature measurement module is configured to collect second image data of a second temperature measurement point according to a second preset frequency, and the second image data are used for representing temperature distribution characteristics of the air-cooled generator rotor; the third temperature measurement module is configured to collect temperature data of a third temperature measurement point according to a preset frequency 3, and the temperature curve graph is used for representing temperature distribution characteristics of a cooling medium of the air-cooled generator; and the processing module comprises a data acquisition module and a temperature monitoring module and is used for acquiring the first image data, the second image data and the third image data in real time.

Description

Technical Field

[0001] The invention relates to the technical field of generator bearing temperature monitoring, and in particular to a real-time temperature measurement system for an air-cooled generator bearing. Background Art

[0002] Air cooling is also called air cooling. The existing cooling methods for large hydro-turbine generators include air cooling, water cooling and evaporative cooling. Among them, air cooling is a mainstream cooling method due to its simple structure. There are two types of air cooling methods: self-circulating ventilation cooling and forced ventilation cooling. Self-circulating ventilation cooling uses the components of the generator itself to drive air flow. The rotor arm of the generator is a plate-like structure, and multiple arms are arranged radially along the main shaft of the generator, also known as the bracket sub-plate. When the motor rotates, the bracket sub-plate drives the air to flow toward the yoke like the blades of a centrifugal fan, forming a rotor radial fan. Due to the obstruction of the annular end faces on both sides of the bracket web, the airflow can only enter the yoke ventilation gap, and then enter the stator core ventilation gap through the gap between the rotor poles, and finally reach the space of the base. The heat is taken away where the airflow passes, realizing the cooling of the rotor yoke, pole coil, stator winding, and stator core. The airflow can be cooled by setting an air cooler.

[0003] Bearings are an important part of air-cooled generators. Taking an umbrella-shaped hydro-turbine generator as an example, there are upper guide bearings, lower guide bearings and thrust bearings. The upper guide bearing is installed on the upper part of the rotor, and the lower guide bearing and thrust bearing are installed on the lower part of the rotor. In order to ensure that the bearings operate within the specified temperature range, a cooler is usually installed in the lubricating oil tank of the bearing.

[0004] In the prior art, only a resistive temperature sensor is installed in each bearing shell to monitor the bearing shell temperature. The measurement point is single and cannot meet the monitoring of the temperature of each part of the bearing. Because there is heat conduction between the various structures of the bearing, if a certain structure has a heat conduction problem, it will affect the heat dissipation effect of the entire bearing. At the same time, there is also heat conduction between the bearing and the generator main shaft and the connecting structure installed on the main shaft. The heat of the generator rotor will also be transmitted to the corresponding structure of the bearing, causing abnormal bearing temperature. Therefore, it is necessary to study the influence of the temperature of other parts such as the generator rotor on the bearing temperature. Summary of the invention

[0005] The present invention can monitor the temperature of each component structure of the generator bearing in real time. At the same time, it establishes the connection between the temperature distribution of the generator rotor and the bearing temperature, determines which part of the temperature has the greatest impact on the bearing temperature, and preferentially adjusts the temperature of the corresponding area to achieve the effect of indirectly reducing the bearing temperature, providing a new strategy for the thermal management of the generator.

[0006] The technical solution proposed by the present invention is: a real-time temperature measurement system for air-cooled generator bearings, comprising: A first temperature measurement module, wherein the first temperature measurement module is configured to collect first image data of a first temperature measurement point at a preset frequency, wherein the first image data is used to represent temperature distribution characteristics of a bearing of an air-cooled generator; A second temperature measurement module, wherein the second temperature measurement module is configured to collect second image data of a second temperature measurement point at a preset frequency 2, wherein the second image data is used to represent temperature distribution characteristics of a rotor of an air-cooled generator; a third temperature measurement module, wherein the third temperature measurement module is configured to collect temperature data of a third temperature measurement point at a preset frequency three and draw a temperature curve graph, wherein the temperature curve graph is used to represent the temperature distribution characteristics of the cooling medium of the air-cooled generator; A processing module, the processing module includes a data acquisition module and a temperature monitoring module, the data acquisition module is connected to the first temperature measurement module, the second temperature measurement module and the third temperature measurement module respectively, and is used to obtain the first image data, the second image data and the third image data in real time; A temperature monitoring model is provided in the temperature monitoring module, and the temperature monitoring model is used to establish the relationship between the temperature distribution characteristics of the air-cooled generator bearing, the temperature distribution characteristics of the air-cooled generator cooling medium and the temperature distribution characteristics of the air-cooled generator rotor, so as to analyze the temperature factors affecting the air-cooled generator bearing and assist in the thermal management of the generator.

[0007] Preferably, the first temperature measurement module is configured to collect first image data of the first temperature measurement point at a preset frequency, including: Obtaining a preset frequency one, the first temperature measurement module obtaining an infrared thermal image of the air-cooled generator bearing within a preset time period according to the preset frequency one, wherein the infrared thermal image includes one or more of an upper guide bearing infrared thermal image, a lower guide bearing infrared thermal image, and a thrust bearing infrared thermal image; Preprocessing the infrared thermal image of the upper guide bearing, the infrared thermal image of the lower guide bearing or the infrared thermal image of the thrust bearing respectively to form an infrared thermal image set of the upper guide bearing, an infrared thermal image set of the lower guide bearing and an infrared thermal image set of the thrust bearing; The first image data includes one or more of an upper guide bearing infrared thermal image set, a lower guide bearing infrared thermal image set, and a thrust bearing infrared thermal image set.

[0008] Preferably, the second temperature measurement module is configured to collect second image data of the second temperature measurement point at a preset frequency 2, including: The preset frequency 2 is obtained, and the second temperature measurement module obtains the infrared thermal image of the rotor and the stator of the air-cooled generator within the preset time period according to the preset frequency 2; Preprocess the infrared thermal images of the rotor and stator of the air-cooled generator to form a rotor and stator thermal image set; The second image data includes a set of rotor and stator thermal images.

[0009] Preferably, the third temperature measurement module is configured to collect temperature data of the third temperature measurement point at a preset frequency and draw a temperature curve graph, including the following steps: The preset frequency three is obtained, and the third temperature measurement module obtains the temperature data of the cooling medium one inside the air-cooled generator and the temperature data of the cooling medium two inside the bearing according to the preset frequency three; After preprocessing the temperature data of cooling medium 1, a cooling medium temperature time series is formed. ,in, , respectively, indicating the time To time In the time period The temperature value of medium 1 at a position, , ; After preprocessing the temperature data of the second cooling medium inside the bearing, the second cooling medium temperature time series is formed. ,in Respectively indicate at time To time In the time period The temperature value of cooling medium 2 at a position, ; According to the medium-temperature time series, the medium- Temperature variation curve at each position; Draw the temperature time series of medium 2 according to the temperature of medium 2 in the Temperature variation curve at each location.

[0010] Preferably, the temperature monitoring model is used to establish the relationship between the temperature distribution characteristics of the air-cooled generator bearing, the temperature distribution characteristics of the air-cooled generator cooling medium and the temperature distribution characteristics of the air-cooled generator rotor, comprising the following steps: Acquire the temperature distribution characteristics of the air-cooled fan bearing to form a temperature distribution characteristic set 1; Acquire the temperature distribution characteristics of the cooling medium of the air-cooled generator to form a second temperature distribution characteristic set; Acquire the temperature distribution characteristics of the air-cooled generator rotor to form a temperature distribution characteristic set three; The elements in the temperature distribution feature set 1, the temperature distribution feature set 2 and the temperature distribution feature set 3 are input as input variables into the temperature monitoring model; The degree of influence of the temperature distribution characteristics of the cooling medium of the output air-cooled generator on the temperature distribution characteristics of the air-cooled generator bearings; The degree of influence of the temperature distribution characteristics of the output air-cooled generator rotor on the temperature distribution characteristics of the air-cooled generator bearing.

[0011] Preferably, the step of obtaining the temperature distribution characteristics of the air-cooled fan bearing to form a temperature distribution characteristic set 1 comprises the following steps: Acquire the infrared thermal image of the bearing of the air-cooled generator within a preset time period according to a preset acquisition frequency, and pre-process the infrared thermal image of the bearing; The preprocessed bearing infrared thermal image is divided into foreground and background according to a preset threshold; Based on the gradient information, the bearing infrared thermal image is segmented into different areas; Cluster the pixels into different regions, each region represents a temperature range; Associating each region with a corresponding component structure of the bearing; Extract the temperature features in each area to form a temperature feature value set and a temperature change feature vector set; The temperature characteristic value set is ,in, Indicates the type Bearing No. The temperature feature set of each region; Respectively The moment type is Bearing No. The average, maximum and minimum temperatures of each region; The temperature change feature vector set is ,in, Indicates bearing From the infrared thermal image of Area to The temperature change vector set of the region, , Indicates bearing The total number of constituent structures; express At the moment, the bearing Infrared thermal image of Area to The temperature change vector of the region; , They respectively represent the starting point and end point of the preset time period; the temperature characteristic value set and the temperature change characteristic vector set constitute the temperature distribution characteristic value set 1.

[0012] Preferably, the step of obtaining the temperature distribution characteristics of the cooling medium of the air-cooled generator to form a second temperature distribution characteristic set comprises the following steps: Get the air temperature change curve, extract the temperature characteristic value from the air change curve, and form a cooling medium temperature distribution characteristic set ,in Indicated in The characteristic set of the temperature value of cooling medium 2 at time, Respectively expressed in The air temperature at position 1, position 2, and position 3 at the moment; Get the coolant temperature change curve Figure 1 , from the coolant temperature change curve Figure 1 Extract temperature characteristic value 2 to form cooling medium temperature characteristic set 1 ,in Indicated in The temperature characteristic set of cooling medium 2 at time 1, Respectively The time represents the temperature value of the cooling medium 2 at the injection end 1 and the outflow end 1; Get the coolant temperature change curve Figure 2 , from the coolant temperature change curve Figure 2 Extract temperature characteristic value 3 to form cooling medium temperature characteristic set 2 ,in Indicated in The second temperature characteristic set of cooling medium at time 2, Respectively expressed in Temperature values ​​of cooling medium 2 at injection end 2 and outflow end 2 at the moment; The temperature characteristic set 1 of cooling medium 2 and the temperature characteristic set 2 of cooling medium 2 are combined to form the temperature characteristic distribution set of cooling medium 2. ; The temperature distribution feature set of cooling medium 1 and the temperature distribution feature set of cooling medium 2 are combined to form the temperature distribution feature set of cooling medium .

[0013] Preferably, the step of obtaining the temperature distribution characteristics of the air-cooled generator rotor to form a temperature distribution characteristic set three comprises the following steps: Acquire infrared thermal images of the rotor and the stator, and pre-process the infrared thermal images of the rotor and the stator; The pre-processed infrared thermal images of the rotor and stator are divided into foreground and background according to a preset threshold; Based on the gradient information, the infrared thermal images of the rotor and stator are divided into different areas; Cluster the pixels into different regions, each region represents a temperature range; Associate each region with a stator and rotor; The temperature features of each area are extracted to form the temperature distribution feature set three.

[0014] Preferably, the temperature distribution feature set three is ; in, represents the temperature feature set of the stator, ; Respectively The average temperature, maximum temperature and minimum temperature of the corresponding area of ​​the stator at the moment; represents the temperature characteristic set of the rotor, , Respectively The average temperature, maximum temperature and minimum temperature of the corresponding area of ​​the rotor at the moment.

[0015] Preferably, the temperature monitoring model is a random forest model; The degree of influence of the temperature distribution characteristics of the cooling medium of the output air-cooled generator on the temperature distribution characteristics of the bearing of the air-cooled generator comprises the following steps: Obtaining temperature distribution feature set 1, temperature distribution feature set 2, and temperature distribution feature set 3; Use the trained temperature monitoring model to analyze temperature distribution feature set 1 and temperature distribution feature set 2; From the temperature detection model, extract the importance score of each feature value in the temperature distribution feature set 2, and arrange them in ascending order to form an importance score sequence 1; According to the importance score sequence pair, the influence degree of the temperature of different inflow end and outflow end of cooling medium one and the temperature of different positions of cooling medium two on the bearing temperature is judged; The degree of influence of the temperature distribution characteristics of the output air-cooled generator rotor on the temperature distribution characteristics of the air-cooled generator bearing comprises the following steps: Use the trained temperature monitoring model to analyze temperature distribution feature set 1 and temperature distribution feature set 3; From the temperature detection model, extract the importance score of each feature value in the temperature distribution feature set 3, and arrange them in ascending order to form the importance score sequence 2; According to the importance score sequence two pairs, the influence of the rotor temperature and stator temperature of the air-cooled generator on the bearing temperature is judged.

[0016] Beneficial effects of the present invention: 1. The present invention sets a plurality of first temperature measuring points, and uses an infrared thermal imaging device to obtain infrared thermal images of the component structures of each bearing of the air-cooled generator. Based on the analysis of the infrared thermal images, the temperature data of each component structure of the bearing can be obtained, which is convenient for understanding the temperature distribution of each bearing and provides comprehensive data for subsequent analysis.

[0017] 2. The present invention sets a plurality of second temperature measuring points, and can monitor the temperature of the air-cooled fan rotor and stator by acquiring corresponding infrared thermal images; at the same time, a plurality of third temperature measuring points are set, and the temperature data of the cooling medium in the cooler of each bearing oil tank of the air-cooled generator is acquired by temperature sensors. The temperature monitoring model is used to analyze the temperature of the air-cooled generator rotor and stator, and the influence of the cooling medium temperature on the bearing temperature, to determine which part of the temperature data should be adjusted first. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a structural block diagram of a real-time temperature measurement system for air-cooled generator bearings.

[0019] Figure 2 A flow chart of a method for establishing a relationship between the temperature distribution characteristics of a cooling medium, the temperature distribution characteristics of a rotor, and the temperature distribution characteristics of a bearing for the present invention. DETAILED DESCRIPTION

[0020] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0021] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0022] refer to Figure 1 The technical solution provided by the present invention is: a real-time temperature measurement system for air-cooled generator bearings, comprising: The first temperature measurement module is configured to collect first image data of a first temperature measurement point at a preset frequency, wherein the first image data is used to represent the temperature distribution characteristics of the air-cooled generator bearing, specifically: Select multiple first temperature measurement points on the upper guide bearing oil tank and the upper and side surfaces of the thrust bearing oil tank of the air-cooled generator; An infrared thermal imaging device is set at each temperature measuring point, and the infrared thermal imaging device obtains an infrared thermal image of the bearing at a preset frequency; the infrared thermal image includes an infrared thermal image of the upper guide bearing, an infrared thermal image of the lower guide bearing and an infrared thermal image of the thrust bearing.

[0023] The infrared thermal image of the upper guide bearing, the infrared thermal image of the lower guide bearing or the infrared thermal image of the thrust bearing are preprocessed respectively to form an infrared thermal image set of the upper guide bearing, the infrared thermal image set of the lower guide bearing and the infrared thermal image set of the thrust bearing; the first image data includes the infrared thermal image set of the upper guide bearing, the infrared thermal image set of the lower guide bearing and the infrared thermal image set of the thrust bearing.

[0024] The second temperature measurement module is configured to collect second image data of the second temperature measurement point according to a preset frequency 2, and the second image data is used to represent the temperature distribution characteristics of the air-cooled generator rotor. Specifically: A plurality of second temperature measurement points are selected at the lower part of the upper frame of the air-cooled generator. A second infrared imaging device is arranged at each second temperature measurement point, and the second infrared imaging device obtains infrared thermal images of the rotor and stator of the generator at a preset frequency.

[0025] The infrared thermal images of the rotor and stator of the air-cooled generator are preprocessed to form a set of thermal images of the rotor and stator; the second image data includes the set of thermal images of the rotor and stator.

[0026] The third temperature measurement module is configured to collect temperature data of the third temperature measurement point at a preset frequency and draw a temperature curve diagram, which is used to represent the temperature distribution characteristics of the cooling medium of the air-cooled generator. Specifically: Select multiple third temperature measurement points at the lower part of the upper frame of the air-cooled generator and in the inlets and outlets of several coolers; A temperature sensor is arranged at each third temperature measuring point, and the temperature sensor collects air temperature data inside the wind hood wall of the air-cooled generator, coolant temperature data one at the inlet of the cooler, and coolant temperature data two at the outlet of the cooler within a preset time period at a preset frequency three; After preprocessing the air temperature data within the preset time period, a cooling medium (air) temperature time series is formed. ,in, , respectively, indicating the time To time In the time period The temperature value of medium 1 at a position, , .

[0027] After preprocessing the temperature data of the second cooling medium inside the bearing within the preset time period, the second cooling medium temperature time series is formed. ,in Respectively indicate at time To time In the time period The temperature value of cooling medium 2 at a position; In this embodiment, the bearings of the air-cooled generator include an upper guide bearing, a lower guide bearing and a thrust bearing, and the cooling medium of the bearings is a coolant, wherein the upper guide bearing, the lower guide bearing and the thrust bearing are all immersed in corresponding lubricating liquid tanks. In order to maintain the temperature of the lubricating liquid, a cooler is installed in each lubricating liquid tank to cool the lubricating liquid. Each cooler shares a coolant supply system. The cooling medium 2 in this article refers to the coolant in the cooler. The cooling medium 2 temperature time series includes the temperature of the coolant at the injection end 1 and the outflow end 1 of the cooler corresponding to the upper guide bearing and the temperature of the coolant at the injection end 2 and the outflow end 2 of the cooler corresponding to the lower guide bearing.

[0028] According to the medium-temperature time series, the medium- The temperature variation curve at the position (injection end 1, outflow end 1); Draw the temperature variation curve of medium 2 at the first position according to the temperature time series of medium 2; Temperature variation curve at two positions (injection end 2, outflow end 2).

[0029] A processing module, the processing module includes a data acquisition module and a temperature monitoring module, the data acquisition module is connected to the first temperature measurement module, the second temperature measurement module and the third temperature measurement module respectively, and is used to obtain the first image data, the second image data and the third image data in real time; refer to Figure 2 The temperature monitoring module is provided with a temperature monitoring model, and the temperature monitoring model is used to establish the relationship between the temperature distribution characteristics of the air-cooled generator bearing, the temperature distribution characteristics of the air-cooled generator cooling medium and the temperature distribution characteristics of the air-cooled generator rotor, including the following steps: The temperature distribution characteristics of the air-cooled fan bearing are obtained to form a temperature distribution characteristic set 1. Specifically: Acquire the infrared thermal image of the bearing of the air-cooled generator within a preset time period according to a preset acquisition frequency, and pre-process the infrared thermal image of the bearing; The preprocessed bearing infrared thermal image is divided into foreground and background according to a preset threshold; Based on the gradient information, the bearing infrared thermal image is segmented into different areas; Cluster the pixels into different regions, each region represents a temperature range; Associating each region with a corresponding component structure of the bearing; Extract the temperature features in each area to form a temperature feature value set and a temperature change feature vector set; The temperature characteristic value set is ,in, Indicates the type Bearing No. The temperature feature set of each region; Respectively The moment type is Bearing No. The average, maximum and minimum temperatures of each region; The temperature change feature vector set is ,in, Indicates bearing From the infrared thermal image of Area to The temperature change vector set of the region, , Indicates bearing The total number of constituent structures; express At the moment, the bearing Infrared thermal image of Area to The temperature change vector of the region; , They respectively represent the starting point and end point of the preset time period; the temperature characteristic value set and the temperature change characteristic vector set constitute the temperature distribution characteristic value set 1.

[0030] The temperature distribution characteristics of the cooling medium of the air-cooled generator are obtained to form a temperature distribution characteristic set 2. Specifically, the temperature distribution characteristic value 1 is extracted from the air temperature change curve to form a cooling medium temperature distribution characteristic set 1. ,in Indicated in The characteristic set of the temperature value of cooling medium 2 at time, Respectively expressed in The air temperature at position 1, position 2, and position 3 at the moment; Get the coolant temperature change curve Figure 1 , from the coolant temperature change curve Figure 1 Extract temperature characteristic value 2 to form cooling medium temperature characteristic set 1 ,in Indicated in The temperature characteristic set of cooling medium 2 at time 1, Respectively The time represents the temperature value of the cooling medium 2 at the injection end 1 and the outflow end 1; Get the coolant temperature change curve Figure 2 , from the coolant temperature change curve Figure 2 Extract temperature characteristic value 3 to form cooling medium temperature characteristic set 2 ,in Indicated in The second temperature characteristic set of cooling medium at time 2, Respectively expressed in Temperature values ​​of cooling medium 2 at injection end 2 and outflow end 2 at the moment; The temperature characteristic set 1 of cooling medium 2 and the temperature characteristic set 2 of cooling medium 2 are combined to form the temperature characteristic distribution set of cooling medium 2. ; The temperature distribution feature set of cooling medium 1 and the temperature distribution feature set of cooling medium 2 are combined to form the temperature distribution feature set of cooling medium .

[0031] The temperature distribution characteristics of the air-cooled generator rotor are obtained to form the temperature distribution characteristic set 3. Specifically: Acquire infrared thermal images of the rotor and the stator, and pre-process the infrared thermal images of the rotor and the stator; The pre-processed infrared thermal images of the rotor and stator are divided into foreground and background according to a preset threshold; Based on the gradient information, the infrared thermal images of the rotor and stator are divided into different regions; the pixels are clustered into different regions, each region represents a temperature range; each region is associated with the stator and rotor; the temperature features of each region are extracted to form a temperature distribution feature set. ;in, represents the temperature feature set of the stator, ; Respectively The average temperature, maximum temperature and minimum temperature of the corresponding area of ​​the stator at the moment; represents the temperature characteristic set of the rotor, , Respectively The average temperature, maximum temperature and minimum temperature of the corresponding area of ​​the rotor at the moment.

[0032] The temperature monitoring model is a random forest regression model, which uses the elements in the temperature distribution feature set 1, the temperature distribution feature set 2 and the temperature distribution feature set 3 as input variables and inputs them into the temperature monitoring model to output the influence of the temperature distribution characteristics of the cooling medium of the air-cooled generator on the temperature distribution characteristics of the air-cooled generator bearing; and comprises the following steps: The trained temperature monitoring model is used to analyze the temperature distribution feature set 1 and the temperature distribution feature set 2. In this embodiment, the temperature of the cooling medium injection end is used as the input variable, and the temperature of different components of the bearing is used as the output variable; the temperature detection model is used to predict the temperature of different positions of the bearing; Taking the upper guide bearing as an example, the upper guide bearing includes (according to the distance from the generator main shaft): the upper guide bearing seat, the upper guide bearing support bolt, the tray and the upper guide bearing bushing, wherein the upper guide bearing bushing is in direct contact with the sliding rotor (shaft collar) and is a direct friction part. The infrared thermal image of the generator bearing includes the infrared thermal image of the upper guide bearing, the infrared thermal image of the lower guide bearing and the thrust bearing (the lower guide bearing and the thrust bearing are located inside the thrust bearing oil tank), so the infrared thermal image of the upper guide bearing component structure can be obtained from the infrared thermal image of the upper guide bearing, so that the temperature data of each component structure of the upper guide bearing can be obtained. Similarly, the infrared thermal image of the lower guide bearing can be obtained at multiple first temperature measurement points of the sealing cover on the upper part of the thrust bearing oil tank, and the infrared thermal image of the thrust bearing component structure can be obtained from the first temperature measurement point on the side of the thrust bearing oil tank. According to the analysis of the infrared thermal image, the temperature data of each component structure of the lower guide bearing and the temperature data of each component structure of the thrust bearing can be obtained.

[0033] According to the feature importance scores provided by the temperature detection model, the feature values ​​in the second temperature distribution feature set are sorted to find the features that have the greatest impact on the bearing temperature.

[0034] The influence of the temperature distribution characteristics of the output air-cooled generator rotor on the temperature distribution characteristics of the air-cooled generator bearing. Specifically: From the temperature detection model, extract the importance score of each feature value in the temperature distribution feature set 2, and arrange them in ascending order to form an importance score sequence 1; According to the importance score sequence pair, the influence degree of the temperature of different inflow end and outflow end of cooling medium one and the temperature of different positions of cooling medium two on the bearing temperature is judged; Use the trained temperature monitoring model to analyze temperature distribution feature set 1 and temperature distribution feature set 3; From the temperature detection model, extract the importance score of each feature value in the temperature distribution feature set 3, and arrange them in ascending order to form the importance score sequence 2; According to the importance score sequence, the influence of the rotor temperature and stator temperature of the air-cooled generator on the bearing temperature is judged. In order to analyze the temperature factors affecting the bearing of the air-cooled generator, corresponding cooling measures are taken (such as reducing the coolant temperature, reducing the temperature of the air in the wind shield wall of the air-cooled generator, adjusting the heat dissipation structure of the air cooler, etc.), while adjusting the corresponding structure or reducing the temperature of the area, directly or indirectly reduce the bearing temperature. Bearing temperature control is an important part of the thermal management of the generator. The temperature of the generator rotor, stator, and cooling medium (air and coolant) is detected, and the temperature connection between them is established. The bearing temperature can be indirectly adjusted by adjusting the temperature of the air in the generator rotor area.

[0035] The embodiments disclosed in the present invention, the process described above with reference to the flowchart can be implemented as a computer software program. The embodiments disclosed in the present invention include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part, and / or installed from a removable medium. When the computer program is executed by the central processing unit (CPU), the above-mentioned functions defined in the method of the present application are executed. It should be noted that the above-mentioned computer-readable medium of the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium can be, for example, but not limited to, a system, device or device of an electrical, magnetic, optical, electromagnetic, infrared segment, or semiconductor, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to, an electrical connection with one or more wire segments, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In the present application, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, electrical wire, optical cable, RF, etc., or any suitable combination of the foregoing.

[0036] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present invention. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0037] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments. Without departing from the principles, the implementation methods of the present invention may be deformed or modified in any way.

Claims

1. A real-time temperature measurement system for air-cooled generator bearings, characterized in that: include: A first temperature measurement module, wherein the first temperature measurement module is configured to collect first image data of a first temperature measurement point at a preset frequency, wherein the first image data is used to represent temperature distribution characteristics of a bearing of an air-cooled generator; A second temperature measurement module, wherein the second temperature measurement module is configured to collect second image data of a second temperature measurement point at a preset frequency 2, wherein the second image data is used to represent temperature distribution characteristics of a rotor of an air-cooled generator; a third temperature measurement module, wherein the third temperature measurement module is configured to collect temperature data of a third temperature measurement point at a preset frequency three and draw a temperature curve graph, wherein the temperature curve graph is used to represent the temperature distribution characteristics of the cooling medium of the air-cooled generator; A processing module, the processing module includes a data acquisition module and a temperature monitoring module, the data acquisition module is connected to the first temperature measurement module, the second temperature measurement module and the third temperature measurement module respectively, and is used to obtain the first image data, the second image data and the third image data in real time; A temperature monitoring model is provided in the temperature monitoring module, and the temperature monitoring model is used to establish the relationship between the temperature distribution characteristics of the air-cooled generator bearing, the temperature distribution characteristics of the air-cooled generator cooling medium and the temperature distribution characteristics of the air-cooled generator rotor, so as to analyze the temperature factors affecting the air-cooled generator bearing and assist in the thermal management of the generator.

2. The real-time temperature measurement system for air-cooled generator bearings according to claim 1 is characterized in that: The first temperature measurement module is configured to collect first image data of a first temperature measurement point at a preset frequency, including: Obtaining a preset frequency one, the first temperature measurement module obtaining an infrared thermal image of the air-cooled generator bearing within a preset time period according to the preset frequency one, wherein the infrared thermal image includes one or more of an upper guide bearing infrared thermal image, a lower guide bearing infrared thermal image, and a thrust bearing infrared thermal image; Preprocessing the infrared thermal image of the upper guide bearing, the infrared thermal image of the lower guide bearing or the infrared thermal image of the thrust bearing respectively to form an infrared thermal image set of the upper guide bearing, an infrared thermal image set of the lower guide bearing and an infrared thermal image set of the thrust bearing; The first image data includes one or more of an upper guide bearing infrared thermal image set, a lower guide bearing infrared thermal image set, and a thrust bearing infrared thermal image set.

3. The real-time temperature measurement system for air-cooled generator bearings according to claim 1 is characterized in that: The second temperature measurement module is configured to collect second image data of a second temperature measurement point at a preset frequency 2, including: The preset frequency 2 is obtained, and the second temperature measurement module obtains the infrared thermal image of the rotor and the stator of the air-cooled generator within the preset time period according to the preset frequency 2; Preprocess the infrared thermal images of the rotor and stator of the air-cooled generator to form a rotor and stator thermal image set; The second image data includes a set of rotor and stator thermal images.

4. The real-time temperature measurement system for air-cooled generator bearings according to claim 1 is characterized in that: The third temperature measurement module is configured to collect temperature data of the third temperature measurement point at a preset frequency and draw a temperature curve graph, including the following steps: The preset frequency three is obtained, and the third temperature measurement module obtains the temperature data of the cooling medium one inside the air-cooled generator and the temperature data of the cooling medium two inside the bearing according to the preset frequency three; After preprocessing the temperature data of cooling medium 1, a cooling medium temperature time series is formed. ,in, , respectively, indicating the time To time In the time period The temperature value of medium 1 at a position, , ; After preprocessing the temperature data of the second cooling medium inside the bearing, the second cooling medium temperature time series is formed. ,in Respectively indicate at time To time In the time period The temperature value of cooling medium 2 at a position, ; According to the medium-temperature time series, the medium- Temperature variation curve at each position; Draw the temperature time series of medium 2 according to the temperature of medium 2 in the Temperature variation curve at each location.

5. The real-time temperature measurement system for air-cooled generator bearings according to claim 4 is characterized in that: The temperature monitoring model is used to establish the relationship between the temperature distribution characteristics of the air-cooled generator bearing, the temperature distribution characteristics of the air-cooled generator cooling medium and the temperature distribution characteristics of the air-cooled generator rotor, and includes the following steps: Acquire the temperature distribution characteristics of the air-cooled fan bearing to form a temperature distribution characteristic set 1; Acquire the temperature distribution characteristics of the cooling medium of the air-cooled generator to form a second temperature distribution characteristic set; Acquire the temperature distribution characteristics of the air-cooled generator rotor to form a temperature distribution characteristic set three; The elements in the temperature distribution feature set 1, the temperature distribution feature set 2 and the temperature distribution feature set 3 are input as input variables into the temperature monitoring model; The degree of influence of the temperature distribution characteristics of the cooling medium of the output air-cooled generator on the temperature distribution characteristics of the air-cooled generator bearings; The degree of influence of the temperature distribution characteristics of the output air-cooled generator rotor on the temperature distribution characteristics of the air-cooled generator bearing.

6. The real-time temperature measurement system for air-cooled generator bearings according to claim 5 is characterized in that: The step of obtaining the temperature distribution characteristics of the air-cooled fan bearing to form a temperature distribution characteristic set 1 comprises the following steps: Acquire the infrared thermal image of the bearing of the air-cooled generator within a preset time period according to a preset acquisition frequency, and pre-process the infrared thermal image of the bearing; The preprocessed bearing infrared thermal image is divided into foreground and background according to a preset threshold; Based on the gradient information, the bearing infrared thermal image is segmented into different areas; Cluster the pixels into different regions, each region represents a temperature range; Associating each region with a corresponding component structure of the bearing; Extract the temperature features in each area to form a temperature feature value set and a temperature change feature vector set; The temperature characteristic value set is ,in, Indicates the type Bearing No. The temperature feature set of each region; Respectively The moment type is Bearing No. The average, maximum and minimum temperatures of each region; The temperature change feature vector set is ,in, Indicates bearing From the infrared thermal image of Area to The temperature change vector set of the region, , Indicates bearing The total number of constituent structures; express At the moment, the bearing Infrared thermal image of Area to The temperature change vector of the region; , They respectively represent the starting point and end point of the preset time period; the temperature characteristic value set and the temperature change characteristic vector set constitute the temperature distribution characteristic value set 1.

7. The real-time temperature measurement system for air-cooled generator bearings according to claim 1 is characterized in that: The step of obtaining the temperature distribution characteristics of the cooling medium of the air-cooled generator to form a second temperature distribution characteristic set includes the following steps: Get the air temperature change curve, extract the temperature characteristic value from the air change curve, and form a cooling medium temperature distribution characteristic set ,in Indicated in The characteristic set of the temperature value of cooling medium 2 at time, Respectively expressed in The air temperature at position 1, position 2, and position 3 at the moment; Get the coolant temperature change curve graph 1, extract the temperature characteristic value 2 from the coolant temperature change curve graph 1, and form the cooling medium temperature characteristic set 1 ,in Indicated in The temperature characteristic set of cooling medium 2 at time 1, Respectively The time represents the temperature value of the cooling medium 2 at the injection end 1 and the outflow end 1; Get the coolant temperature change curve 2, extract the temperature characteristic value 3 from the coolant temperature change curve 2, and form the cooling medium temperature characteristic set 2 ,in Indicated in The second temperature characteristic set of cooling medium at time 2, Respectively expressed in Temperature values ​​of cooling medium 2 at injection end 2 and outflow end 2 at the moment; The temperature characteristic set 1 of cooling medium 2 and the temperature characteristic set 2 of cooling medium 2 are combined to form the temperature characteristic distribution set of cooling medium 2. ; The temperature distribution feature set of cooling medium 1 and the temperature distribution feature set of cooling medium 2 are combined to form the temperature distribution feature set of cooling medium .

8. The real-time temperature measurement system for air-cooled generator bearings according to claim 7 is characterized in that: The step of obtaining the temperature distribution characteristics of the air-cooled generator rotor to form a temperature distribution characteristic set 3 comprises the following steps: Acquire infrared thermal images of the rotor and the stator, and pre-process the infrared thermal images of the rotor and the stator; The pre-processed infrared thermal images of the rotor and stator are divided into foreground and background according to a preset threshold; Based on the gradient information, the infrared thermal images of the rotor and stator are divided into different areas; Cluster the pixels into different regions, each region represents a temperature range; Associate each region with a stator and rotor; The temperature features of each area are extracted to form the temperature distribution feature set three.

9. The real-time temperature measurement system for air-cooled generator bearings according to claim 1, characterized in that: The temperature distribution feature set three is ; in, represents the temperature feature set of the stator, ; Respectively The average temperature, maximum temperature and minimum temperature of the corresponding area of ​​the stator at the moment; represents the temperature characteristic set of the rotor, , Respectively The average temperature, maximum temperature and minimum temperature of the corresponding area of ​​the rotor at the moment.

10. The real-time temperature measurement system for air-cooled generator bearings according to claim 1, characterized in that: The temperature monitoring model is a random forest model; The degree of influence of the temperature distribution characteristics of the cooling medium of the output air-cooled generator on the temperature distribution characteristics of the bearing of the air-cooled generator comprises the following steps: Obtaining temperature distribution feature set 1, temperature distribution feature set 2, and temperature distribution feature set 3; Use the trained temperature monitoring model to analyze temperature distribution feature set 1 and temperature distribution feature set 2; From the temperature detection model, extract the importance score of each feature value in the temperature distribution feature set 2, and arrange them in ascending order to form an importance score sequence 1; According to the importance score sequence pair, the influence degree of the temperature of different inflow end and outflow end of cooling medium one and the temperature of different positions of cooling medium two on the bearing temperature is judged; The degree of influence of the temperature distribution characteristics of the output air-cooled generator rotor on the temperature distribution characteristics of the air-cooled generator bearing comprises the following steps: Use the trained temperature monitoring model to analyze temperature distribution feature set 1 and temperature distribution feature set 3; From the temperature detection model, extract the importance score of each feature value in the temperature distribution feature set 3, and arrange them in ascending order to form the importance score sequence 2; According to the importance score sequence two pairs, the influence of the rotor temperature and stator temperature of the air-cooled generator on the bearing temperature is judged.

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