Wind power generation system and generator temperature rise warning method and storage medium

Abstract

The present invention discloses a wind power generation system and a method for early warning of the temperature rise of its generator, and a storage medium thereof. The method comprises: when a temperature rise abnormality of a generator of a wind turbine in the wind power generation system is detected based on a preset detection model, obtaining the front-end temperature and rear-end temperature of the main shaft corresponding to the abnormality within the abnormal period; generating a front-end and rear-end temperature difference time series diagram, a front-end thermal comparison diagram, and a rear-end thermal comparison diagram based on the front-end and rear-end temperatures; determining a risk value and reference maintenance measures based on the front-end and rear-end temperature difference time series diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram; obtaining historical early warning information corresponding to the abnormality, and generating the historical early warning information together with the risk value and the reference maintenance measures into early warning information, and performing an early warning of the abnormal temperature rise of the generator based on the early warning information. In this way, an early warning of the abnormal temperature rise of the generator is achieved through the early warning information, and maintenance is made more convenient, thereby improving maintenance efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a wind power generation system and a method for early warning of temperature rise of a generator thereof, and a storage medium. Background Art

[0002] Wind power generation is gaining increasing attention due to its clean, environmentally friendly, and renewable nature. Its basic operating principle is that wind turbines convert wind energy into mechanical energy, which is then converted into electrical energy by generators and output to the power grid. A wind power generation system primarily consists of multiple wind turbines, including a rotor, main shaft, gearbox, generator, and supporting tower. The rotors are equipped with blades, which, when rotated by the wind, convert wind energy into mechanical energy.

[0003] Wind turbine power generation is closely tied to the proper functioning of its various internal components, such as the generator and main shaft. However, certain anomalies are inevitable, such as excessive generator temperature rise and improper main shaft lubrication. Currently, there's no early warning mechanism for these abnormalities. Maintenance personnel only initiate repairs when abnormal generator temperature rise causes the wind turbine to malfunction, failing to provide early warning. Furthermore, maintenance personnel cannot directly determine the cause of the abnormality, requiring them to test each component individually. This makes maintenance difficult and inefficient. Summary of the Invention

[0004] The main purpose of the present invention is to provide a wind power generation system and a method for warning the temperature rise of its generator, as well as a storage medium, aiming to solve the technical problems in the existing technology that the wind power generation system lacks an early warning mechanism for the temperature rise of the generator, which makes early warning of abnormal temperature rise impossible, and leads to maintenance difficulties and low maintenance efficiency.

[0005] To achieve the above object, the present invention provides an early warning method for temperature rise of a generator in a wind power generation system, the early warning method comprising:

[0006] When a temperature rise abnormality is detected in a generator of any wind turbine in the wind power generation system based on a preset detection model, the front-end temperature and the rear-end temperature of the main shaft corresponding to the abnormal temperature rise of the generator are obtained during the abnormal period;

[0007] Generate a front-end and rear-end temperature difference time sequence diagram, a front-end thermal comparison diagram, and a rear-end thermal comparison diagram according to the front-end temperature and the rear-end temperature;

[0008] Determining the risk value and reference maintenance measures corresponding to the abnormal temperature rise of the generator based on the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram;

[0009] Acquire historical warning information corresponding to the abnormal temperature rise of the generator, generate warning information by combining the historical warning information, the risk value and reference maintenance measures, and issue a warning of the abnormal temperature rise of the generator based on the warning information.

[0010] Optionally, the step of generating a front-end and rear-end temperature difference timing diagram, a front-end thermal comparison diagram, and a rear-end thermal comparison diagram respectively according to the front-end temperature and the rear-end temperature includes:

[0011] Generating the front-end temperature and the back-end temperature into a temperature difference time series curve, and obtaining a historical temperature difference time series curve generated based on the front-end historical temperature data and the back-end historical temperature data;

[0012] Generate the front-end and rear-end temperature difference timing diagram based on the temperature difference timing curve and the historical temperature difference timing curve based on a preset timing diagram template;

[0013] Obtaining the rotational speed of the main shaft during the abnormal period, and the reference rotational speed, front-end reference temperature, and rear-end reference temperature of the main shaft of a wind turbine in a generator in the wind power generation system that does not have abnormal temperature rise during the abnormal period;

[0014] The front-end thermal comparison diagram and the rear-end thermal comparison diagram are generated according to the reference rotational speed, the front-end reference temperature and the rear-end reference temperature, and the rotational speed, the front-end temperature and the rear-end temperature.

[0015] Optionally, the step of generating the front-end thermal comparison map and the rear-end thermal comparison map according to the reference speed, the front-end reference temperature and the rear-end reference temperature, and the front-end temperature and the rear-end temperature includes:

[0016] generating a front-end reference thermal map by using the reference speed and the front-end reference temperature, and adding the front-end temperature to the front-end reference thermal map according to a corresponding relationship between the speed and the reference speed to generate the front-end thermal comparison map;

[0017] The reference speed and the rear-end reference temperature are generated as a rear-end reference thermal map, and according to the corresponding relationship between the speed and the reference speed, the rear-end temperature is added to the rear-end reference thermal map to generate the rear-end thermal comparison map.

[0018] Optionally, the step of determining a risk value and reference maintenance measures corresponding to the abnormal temperature rise of the generator based on the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram includes:

[0019] Verify the authenticity of the abnormal temperature rise of the generator based on the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram;

[0020] If the authenticity of the abnormal temperature rise of the generator is verified, a first risk value, a second risk value, and a third risk value are generated respectively according to the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram, and a first maintenance measure, a second maintenance measure, and a third maintenance measure are generated respectively;

[0021] The risk value and the reference maintenance measure are determined according to the first risk value, the second risk value, the third risk value, and the first maintenance measure, the second maintenance measure, and the third maintenance measure.

[0022] Optionally, the step of verifying the authenticity of the abnormal temperature rise of the generator according to the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram includes:

[0023] Obtaining the median of the temperature difference timing curve in the front-end and rear-end temperature difference timing diagram and the reference median of the historical temperature difference timing curve;

[0024] Generating a median deviation from the median and a reference median, and determining whether the median deviation is abnormal;

[0025] Determine whether the front end temperature of the spindle is abnormal relative to the front end reference temperature of the front end thermal comparison diagram in the area with the same rotational speed value in the front end thermal comparison diagram;

[0026] Determine whether the rear end temperature of the spindle is abnormal relative to the rear end reference temperature of the rear end thermal comparison diagram in the region with the same rotational speed value in the rear end thermal comparison diagram;

[0027] If the median deviation is abnormal, and / or the front end temperature of the main shaft is abnormal relative to the front end reference temperature, and / or the rear end temperature of the main shaft is abnormal relative to the rear end reference temperature, then the authenticity of the generator temperature rise abnormality is determined to be verified.

[0028] Optionally, the step of determining the risk value and the reference maintenance measure according to the first risk value, the second risk value, the third risk value, and the first maintenance measure, the second maintenance measure, and the third maintenance measure includes:

[0029] comparing the first risk value, the second risk value, and the third risk value, and determining a maximum value as the risk value;

[0030] Perform a union operation on the first maintenance measure, the second maintenance measure, and the third maintenance measure, and obtain a union operation result as the reference maintenance measure.

[0031] Optionally, the step of generating a first risk value, a second risk value, and a third risk value respectively according to the front-end and rear-end temperature difference time series diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram includes:

[0032] Comparing the median deviation in the front-end and rear-end temperature difference time series diagram with each first preset numerical interval, determining a first target numerical interval in which the median deviation is located, and determining the first risk value based on a first preset risk value corresponding to the first target numerical interval;

[0033] determining a front average difference in the front end temperature of the spindle relative to the front end reference temperature, comparing the front average difference with each second preset numerical interval, determining a second target numerical interval within which the front average difference falls, and determining a second risk value based on a second preset risk value corresponding to the second target numerical interval;

[0034] Determine the rear end average difference size of the rear end temperature of the spindle relative to the rear end reference temperature, and compare the rear end average difference size with each third preset numerical interval to determine the third target numerical interval in which the rear end average difference size is located, and determine the third risk value based on the third preset risk value corresponding to the third target numerical interval.

[0035] Optionally, the reference maintenance measures include at least detecting the operating status of the temperature sensor corresponding to the main shaft, detecting the operating status of the cooling fan of the generator with abnormal temperature, detecting whether there is any operating abnormality in the main bearing corresponding to the main shaft, and detecting whether there is any lubrication abnormality in the main bearing.

[0036] Furthermore, to achieve the above-mentioned object, the present invention also provides a wind power generation system, comprising: a memory, a processor, a communication bus, and a control program stored in the memory:

[0037] The communication bus is used to realize the connection and communication between the processor and the memory;

[0038] The processor is used to execute the control program to implement the steps of the above-mentioned method for early warning of temperature rise of a generator in a wind power generation system.

[0039] Furthermore, to achieve the above-mentioned purpose, the present invention also provides a storage medium having a control program stored thereon, which, when executed by a processor, implements the steps of the above-mentioned method for warning temperature rise of a generator in a wind power generation system.

[0040] The wind power generation system and its generator temperature rise early warning method and storage medium of the present invention are provided with a preset detection model. When the preset detection model detects an abnormal temperature rise in the generator of any wind turbine in the wind power generation system, the front-end and rear-end temperatures of the main shaft of the wind turbine containing the abnormal temperature rise are obtained during the abnormal period. Based on the obtained front-end and rear-end temperatures, a front-end and rear-end temperature difference time series diagram, a front-end and rear-end thermal comparison diagram, and a rear-end thermal comparison diagram are generated. Simultaneously, based on the front-end and rear-end temperature difference time series diagram, the front-end and rear-end thermal comparison diagrams, a risk value and reference maintenance measures for the generator experiencing the abnormal temperature rise are determined. The risk value reflects the degree of abnormality in the generator temperature rise, and the reference maintenance measures reflect possible maintenance measures for the generator experiencing the abnormal temperature rise. Subsequently, historical early warning information for the generator experiencing the abnormal temperature rise is obtained, and this historical early warning information, the risk value, and the reference maintenance measures are collectively generated as early warning information output for providing an early warning for the generator experiencing the abnormal temperature rise. This allows early warning of potential generator anomalies, preventing the operator from noticing the anomaly until after the wind turbine fails to generate power due to abnormal temperature rise. Furthermore, maintenance personnel can identify the cause of the anomaly and the corresponding repair measures by viewing the reference repair measures in the warning information. This helps to quickly eliminate the cause of the anomaly, making maintenance more convenient and significantly improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a flow chart of a first embodiment of a method for early warning of temperature rise of a generator in a wind power generation system according to the present invention;

[0042] Figure 2 A timing diagram of the front-end and rear-end temperature differences generated by an embodiment of a method for early warning of temperature rise of a generator in a wind power generation system according to the present invention;

[0043] Figure 3 A front-end thermal comparison diagram generated by an embodiment of a method for early warning of temperature rise of a generator in a wind power generation system according to the present invention;

[0044] Figure 4 A back-end thermal comparison diagram generated by an embodiment of a method for early warning of temperature rise of a generator in a wind power generation system according to the present invention;

[0045] Figure 5 This is a flow chart of a second embodiment of a method for early warning of temperature rise of a generator in a wind power generation system according to the present invention;

[0046] Figure 6 This is a schematic diagram of the structure of the hardware operating environment involved in an embodiment of the wind power generation system of the present invention.

[0047] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0048] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0049] The present invention provides a method for early warning of temperature rise of generators in a wind power generation system. Figure 1 , Figure 1 This is a flow chart of a first embodiment of a method for early warning of temperature rise of a generator in a wind power generation system according to the present invention.

[0050] The present invention provides an embodiment of a method for early warning of temperature rise of a generator in a wind power generation system. It should be noted that although the flowchart shows a logical sequence, in some cases, the steps shown or described may be performed in a different order. Specifically, the method for early warning of temperature rise of a generator in a wind power generation system in this embodiment includes:

[0051] Step S10, when it is detected based on the preset detection model that the temperature rise of the generator of any wind turbine in the wind power generation system is abnormal, obtaining the front-end temperature and the rear-end temperature of the main shaft corresponding to the abnormal temperature rise of the generator during the abnormal period;

[0052] The wind power generation system of this embodiment includes multiple wind turbines, each of which comprises at least a rotor, a main shaft, a gearbox, a generator, and a supporting tower. The main shaft is equipped with a main bearing, while the rotor comprises at least blades, a hub, bearings, and a rotor. The blades, in response to wind, generate torque that rotates the shaft, converting the rotor into mechanical energy. This mechanical energy is then transmitted to the generator via a transmission device, including a gearbox, coupling, and bearings, which converts it into alternating current (AC) through electromagnetic induction.

[0053] This generator temperature rise warning method can be applied to the entire wind power generation system, and can also be applied to each wind turbine in the wind power generation system. The wind power generation system must be provided with a control device for controlling the orderly operation of each component to achieve wind power generation. The control device can be a centralized overall control or a distributed overall plus local control. For the former, the generator temperature rise warning method is applied to the overall control device, that is, the system control device. For the latter, the generator temperature rise warning method can be applied to both the overall control device and the local control device, that is, the control device of each wind turbine. This embodiment is preferably described by taking the system control device as an example.

[0054] Furthermore, to monitor the operating conditions of various components in the wind turbine, multiple detection models are pre-set. For example, detection models for main bearing lubrication, generator temperature rise, and power curves can be set. Different types of detection models can also be set for anemometers, gearboxes, etc. In this embodiment, various detection models can be unified into a pre-set detection model. Of course, each detection model can also be separated and multiple detection models can be set.

[0055] Furthermore, the preset detection model is pre-trained to generate reference data reflecting normal generator temperature rise. This reference data can be used to monitor the normality of the generator temperature rise in real time. When an abnormal temperature rise is detected in a wind turbine in a wind power generation system, indicating a possible problem with the generator temperature rise, a verification mechanism is provided to ensure the accuracy of the detection by combining the temperature difference between the front and rear ends of the main shaft, thermal maps, etc. To achieve this, it is necessary to obtain the temperature value of the main shaft in the wind turbine where the generator with the abnormal temperature rise is located during the abnormal period. The obtained temperature value includes the front temperature of the main shaft front end and the rear temperature of the main shaft rear end.

[0056] Step S20, generating a front-end and rear-end temperature difference timing diagram, a front-end thermal comparison diagram, and a rear-end thermal comparison diagram respectively according to the front-end temperature and the rear-end temperature;

[0057] Furthermore, a difference calculation is performed between the obtained front-end temperature and the rear-end temperature, and a front-end and rear-end temperature time series diagram is generated based on the difference calculation result. At the same time, a front-end thermal comparison diagram is generated based on the front-end temperature, and a rear-end thermal comparison diagram is generated based on the rear-end temperature. Specifically, the steps of generating the front-end and rear-end temperature difference time series diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram based on the front-end temperature and the rear-end temperature, respectively, include:

[0058] Step S21, generating a temperature difference time series curve based on the front-end temperature and the back-end temperature, and obtaining a historical temperature difference time series curve generated based on the front-end historical temperature data and the back-end historical temperature data;

[0059] Step S22, generating the front-end and rear-end temperature difference timing diagram based on the temperature difference timing curve and the historical temperature difference timing curve based on a preset timing diagram template;

[0060] Step S23, obtaining the rotational speed of the main shaft during the abnormal period, and the reference rotational speed, front-end reference temperature, and rear-end reference temperature of the main shaft of the wind turbine in the wind power generation system where the generator without abnormal temperature rise is located during the abnormal period;

[0061] Step S24 , generating the front-end thermal comparison diagram and the rear-end thermal comparison diagram according to the reference speed, the front-end reference temperature, and the rear-end reference temperature, as well as the speed, the front-end temperature, and the rear-end temperature.

[0062] Furthermore, the front-end temperature and the rear-end temperature obtained at the same time point during the abnormal period are subjected to a difference operation to obtain the difference operation results of each time point during the abnormal period, and the temperature difference timing curve corresponding to the abnormal period is formed by the difference operation results of each time point. At the same time, the front-end historical temperature data and the rear-end historical temperature data of the main shaft when the generator heated up normally in the past are obtained, and the front-end historical temperature data and the rear-end historical temperature data are subjected to a difference operation to obtain a historical temperature difference timing curve. In addition, a preset timing diagram template for generating a timing diagram is pre-set, and the formed temperature difference timing curve and the historical temperature difference timing curve are added to the preset timing diagram template to generate a front-end and rear-end temperature difference timing diagram to reflect the change in the front-end and rear-end temperature difference. For details, see Figure 2 As shown, curve No. 4 is the abnormal temperature difference time series curve generated on April 20, 2020, and curves No. 1, 2, and 3 are the normal historical temperature difference time series curves on August 31, 2019, September 30, 2019, and November 2019, respectively. These curves are jointly generated to form the front-end and back-end temperature difference time series diagram.

[0063] Furthermore, the front-end thermal comparison diagram is a comparison of the front-end temperatures of different main shafts at the same speed, and the rear-end thermal comparison diagram is a comparison of the rear-end temperatures of different main shafts at the same speed. The speed of the fan main shaft of the generator with abnormal temperature rise is obtained during the abnormal period. At the same time, the speed of the fan main shaft of other generators without abnormal temperature rise is obtained during the abnormal period as the reference speed, and the front-end temperature and rear-end reference temperature of this type of main shaft are obtained as the front-end reference temperature and rear-end reference temperature respectively. Then, a front-end thermal comparison diagram is generated based on the reference speed, the front-end reference temperature, the speed and the front-end temperature, and a rear-end thermal comparison diagram is generated based on the reference speed, the rear-end reference temperature, the speed and the rear-end temperature. Wherein, the steps of generating the front-end thermal comparison diagram and the rear-end thermal comparison diagram based on the reference speed, the front-end reference temperature and the rear-end reference temperature, as well as the front-end temperature and the rear-end temperature include:

[0064] Step S241, generating a front-end reference thermodynamic map using the reference speed and the front-end reference temperature, and adding the front-end temperature to the front-end reference thermodynamic map based on the corresponding relationship between the speed and the reference speed to generate the front-end thermodynamic comparison map;

[0065] In step S242, the reference speed and the rear-end reference temperature are generated into a rear-end reference thermal map, and according to the correspondence between the speed and the reference speed, the rear-end temperature is added to the rear-end reference thermal map to generate the rear-end thermal comparison map.

[0066] Furthermore, the reference speed and the front-end reference temperature are first generated as a front-end reference thermal map, and the front-end reference temperature of each main shaft is matched to the corresponding reference speed value or interval according to the reference speed value from small to large, or the reference speed is divided into multiple intervals from small to large, to generate a front-end reference thermal map. Then, according to the correspondence between the speed and the reference speed, the front-end temperature is added to the front-end reference thermal map to generate a front-end thermal comparison map. For example, the divided speed intervals include 0-10, 10-12, 12-14, etc., then the front-end reference temperatures of each main shaft in this type of interval are arranged in the order of the intervals to obtain a front-end reference thermal map. Then, the front-end temperature corresponding to the main shaft in the fan where the generator with abnormal temperature rise is located in each speed interval is determined, and each corresponding front-end temperature is added to each speed interval of the front-end reference thermal map to generate a front-end thermal comparison map. For details, see Figure 3 As shown, the generators in fans 69, 56, 50, and 47 did not experience abnormal temperature rise. The front-end reference temperatures at their respective main shaft speeds of 0-10, 10-12, 12-14, and 14-16 were generated as front-end reference thermal maps. The generator in fan 48 experienced an abnormal temperature rise. The front-end temperatures at its main shaft speeds of 0-10, 10-12, 12-14, and 14-16 were added to the front-end reference thermal map to generate a front-end thermal comparison map.

[0067] Furthermore, for the rear-end thermal comparison diagram, the reference speed and the rear-end reference temperature are first generated as a rear-end reference thermal diagram, and the corresponding rear-end reference temperature of each main shaft is matched to the corresponding reference speed value or interval according to the reference speed value from small to large, or the reference speed is divided into multiple intervals from small to large, to generate a rear-end reference thermal diagram. Then, according to the correspondence between the speed and the reference speed, the rear-end temperature is added to the rear-end reference thermal diagram to generate a rear-end thermal comparison diagram. For example, the divided speed intervals include 0-10, 10-12, 12-14, etc., then the rear-end reference temperatures of each main shaft in this type of interval are arranged in the order of the intervals to obtain a rear-end reference thermal diagram. Then, the rear-end temperature corresponding to the main shaft in the fan where the generator with abnormal temperature rise is located in each speed interval is determined, and each corresponding rear-end temperature is added to each speed interval of the rear-end reference thermal diagram to generate a rear-end thermal comparison diagram. For details, see Figure 4 As shown in the figure, the generators in fans 69, 56, 50, and 47 did not experience abnormal temperature rise. The rear-end reference temperatures of their respective main shafts at speeds of 0-10, 10-12, 12-14, and 14-16 were generated as the rear-end reference thermal map. The generator in fan 48 experienced abnormal temperature rise. The rear-end temperatures of its main shaft at speeds of 0-10, 10-12, 12-14, and 14-16 were added to the rear-end reference thermal map to generate a rear-end thermal comparison map. For details, see Figure 4 .

[0068] Step S30, determining a risk value and reference maintenance measures corresponding to the abnormal temperature rise of the generator based on the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram;

[0069] Understandably, the severity of a generator temperature rise anomaly will have different impacts on wind turbine power generation. Some anomalies may have more severe impacts on the wind turbine, such as directly causing it to shut down, while others may have less severe effects. Therefore, to determine the severity of a generator temperature rise anomaly, after confirming that the generator exhibiting an abnormal temperature rise, as monitored by the preset detection model, is indeed abnormal based on the front-end and rear-end temperature difference time series diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram, a risk value is then determined for the generator exhibiting an abnormal temperature rise, reflecting the severity of the risk. Furthermore, a warning level can be determined based on the risk value. A correspondence between the risk value range and the warning level can be pre-set. For example, a risk value range of 0-1 can be set, where 0-0.3 corresponds to a low warning level, 0.31-0.7 corresponds to a medium warning level, and 0.71-1 corresponds to a high warning level. After determining the risk value, the corresponding warning level can be determined based on the risk value range.

[0070] Furthermore, corresponding maintenance measures can be set in advance for various fault anomalies. The possible anomalies can be determined by the front-end and rear-end temperature difference time series diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram. Then, the corresponding maintenance measures can be found as reference maintenance measures, so that maintenance personnel can quickly and accurately repair the generator with abnormal temperature rise through the reference maintenance measures. Among them, the reference maintenance measures determined by the preset maintenance measures at least include detecting the operation status of the temperature sensor corresponding to the main shaft to determine whether there is a temperature sensor failure; detecting the operation status of the cooling fan of the generator with abnormal temperature, such as whether it is in normal operation; detecting whether the main bearing corresponding to the main shaft has an operation anomaly, such as whether there is grease leakage or corrosion on the main bearing surface, whether there is abnormal noise from the main bearing, whether there is excessive waste oil between the main bearing and the brake disc and in the generator oil collection device; and detecting whether there is lubrication anomaly of the main bearing, such as whether the oil level is too low, whether the lubricating oil pipe joint is leaking, whether the lubricating oil pipe is leaking, whether there is surface cracking or embrittlement, whether the lubricating oil pump is working properly, and whether each lubrication point is supplying oil normally.

[0071] Step S40: acquiring historical warning information corresponding to the abnormal temperature rise of the generator, generating warning information from the historical warning information, the risk value and reference maintenance measures, and issuing a warning of the abnormal temperature rise of the generator based on the warning information.

[0072] Furthermore, the generator in the same wind turbine may have multiple abnormal temperature rises, and an early warning will be issued before each abnormal temperature rise. For a new early warning, a mechanism is set up to combine all previous warnings into early warning information, so as to comprehensively reflect the abnormal lubrication of the generator in the wind turbine. Specifically, the historical early warning information of the generator that currently has abnormal lubrication is obtained. The historical early warning information may include the number of previous warnings and the warning level. For example, the warning level includes high, medium and low levels. The number of previous warnings for the temperature rise of this generator is 8 times, including 3 high-level warnings, 3 medium-level warnings and 2 low-level warnings. At the same time, the historical early warning information can also include the specific description of the previous warnings and the time of the warning, as well as the warning curve. The warning curve is a curve generated by the number of historical warnings, the warning level and the warning time, which is convenient for maintenance personnel to view the overall warning situation of the temperature rise of the generator.

[0073] Furthermore, the acquired historical warning information is combined with risk values ​​and reference maintenance measures to generate warning information. A pre-set template for generating warning information is provided. By adding various pieces of information from the historical warning information, risk values, and reference maintenance measures to the corresponding positions in the template, a warning message is generated. This warning information is then output to the wind turbine system's monitoring center or to a maintenance personnel's smart terminal connected to the wind turbine system for early warning. This allows maintenance personnel to review the warning information and promptly repair any generators experiencing lubrication anomalies based on the warning information.

[0074] Understandably, after maintenance personnel inspect a generator experiencing an abnormal temperature rise based on the warning information, the generator's temperature rise returns to normal. The warning anomaly is resolved and becomes a historical warning, requiring an update of the historical warning information. Specifically, a pre-set detection model analyzes the data from the generator currently experiencing an abnormal temperature rise, which was inspected by the maintenance personnel, to determine whether the generator is still experiencing an abnormal temperature rise. If not, the detected anomaly has been resolved, and a warning cancellation message is output. Simultaneously, the historical warning information is updated based on the latest warning information to facilitate maintenance and inspection of the generator experiencing the next abnormal temperature rise.

[0075] The present invention provides a method for early warning of generator temperature rise in a wind turbine system. When the preset detection model detects an abnormal temperature rise in any wind turbine in the wind turbine system, the method obtains the front-end and rear-end temperatures of the main shaft of the turbine containing the abnormally rising generator during the abnormal period. Based on the obtained front-end and rear-end temperatures, a front-end and rear-end temperature difference time series diagram, a front-end and rear-end thermal comparison diagram, and a rear-end thermal comparison diagram are generated. Simultaneously, based on the front-end and rear-end temperature difference time series diagram, the front-end and rear-end thermal comparison diagrams, the method determines a risk value and reference maintenance measures for the abnormally rising generator. The risk value reflects the degree of abnormality in the generator temperature rise, while the reference maintenance measures reflect potential maintenance measures for the abnormally rising generator. Subsequently, historical early warning information for the abnormally rising generator is obtained, and this historical warning information, the risk value, and the reference maintenance measures are collectively generated as early warning information output for providing early warning of the abnormally rising generator. This allows early warning of potential generator anomalies, preventing the operator from noticing the anomaly until after the wind turbine fails to generate power due to abnormal temperature rise. Furthermore, maintenance personnel can identify the cause of the anomaly and the corresponding repair measures by viewing the reference repair measures in the warning information. This helps to quickly eliminate the cause of the anomaly, making maintenance more convenient and significantly improving efficiency.

[0076] Further, please refer to Figure 5 Based on the first embodiment of the early warning method for temperature rise of a generator in a wind power generation system of the present invention, a second embodiment of the early warning method for temperature rise of a generator in a wind power generation system of the present invention is proposed.

[0077] The second embodiment of the method for early warning of temperature rise of a generator in a wind power generation system differs from the first embodiment of the method for early warning of temperature rise of a generator in a wind power generation system in that the step of determining a risk value and reference maintenance measures corresponding to the abnormal generator temperature rise based on the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram comprises:

[0078] Step S31, verifying the authenticity of the abnormal temperature rise of the generator based on the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram;

[0079] In this embodiment, the abnormality of the front-end and rear-end temperature difference timing diagram, the abnormality of the front-end thermal comparison diagram, and the abnormality of the rear-end thermal comparison diagram can all be used to reflect the severity of the abnormal temperature rise of the generator, and can also verify the accuracy of the monitoring of the preset detection model. Specifically, first verify the authenticity of the abnormal temperature rise of the generator based on the front-end and rear-end temperature difference timing diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram. If there is an abnormality in the front-end and rear-end temperature difference timing diagram, the front-end thermal comparison diagram, or the rear-end thermal comparison diagram, it can be determined that the temperature rise of the generator is indeed abnormal. Among them, the step of verifying the authenticity of the abnormal temperature rise of the generator based on the front-end and rear-end temperature difference timing diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram includes:

[0080] Step a1, obtaining the median of the temperature difference time series curve in the front-end and rear-end temperature difference time series diagram and the reference median of the historical temperature difference time series curve;

[0081] Step a2, generating a median deviation from the median and the reference median, and determining whether the median deviation is abnormal;

[0082] Step a3, determining whether the front end temperature of the spindle in the region with the same rotational speed value in the front end thermal comparison diagram is abnormal relative to the front end reference temperature of the front end thermal comparison diagram;

[0083] Step a4, determining whether there is an abnormality in the rear end temperature of the spindle relative to the rear end reference temperature of the rear end thermal comparison diagram in the area with the same rotational speed value in the rear end thermal comparison diagram.

[0084] Furthermore, the temperature difference timing curve and the historical temperature difference timing curve that form the front-end and rear-end temperature difference timing diagram respectively contain a median and a reference median. The median and the reference median are identified, and the difference between the two times is taken to generate a median deviation. The median deviation identifies the degree to which the median deviates from the reference median. In order to reflect the magnitude of the deviation, a deviation threshold can be set in advance. The generated median deviation is compared with the deviation threshold. If the median deviation is greater than the deviation threshold, it means that the median of the temperature difference timing curve deviates from the reference median of the historical temperature difference timing curve to a large extent, and it is determined that there is an abnormality in the median deviation. Otherwise, it means that the degree of deviation is not large, and there is no abnormality in the median deviation. In this way, the determination of whether there is an abnormality in the median deviation is achieved. If the deviation threshold is set to 0.5, for Figure 2 The front-end and rear-end temperature difference timing diagram shown has a reference median of 1.8 determined by the historical temperature difference timing curve, and a median determined by the temperature difference timing curve of -1, resulting in a median deviation of 2.8, indicating that the median deviation is abnormal.

[0085] Furthermore, the abnormality determination method for the front-end thermal comparison diagram and the rear-end thermal comparison diagram is consistent, and the front-end thermal comparison diagram is used as an example for explanation. Specifically, the front-end temperature of the main shaft corresponding to the generator without temperature rise abnormality is used as the front-end reference temperature in the front-end thermal comparison diagram, and the front-end temperature of the main shaft corresponding to the generator with temperature rise abnormality is compared with the front-end reference temperature at the same speed value or speed value range to determine whether the front-end temperature of the main shaft is abnormal relative to the front-end reference temperature. For example, see Figure 3 The front-end thermal comparison chart is a bar chart. Each bar in the chart represents the main shaft of a fan. The bars are divided into multiple intervals according to their height. Each interval represents a speed value or speed interval. The front-end temperature can be represented within the interval. By comparing the front-end temperatures between the bars in the same interval, it can be determined whether the front-end temperature of the main shaft is abnormal relative to the front-end reference temperature. In addition, to facilitate inspection by maintenance personnel, color blocks can also be used to represent the temperature of the interval. Different color blocks represent different temperatures. The color differences between the bars in the same interval can be used to intuitively display the front-end temperature differences. If the difference between the front-end temperature of the main shaft and the front-end reference temperature is large, it can be determined that the front-end temperature of the main shaft is abnormal relative to the front-end reference temperature. Otherwise, there is no abnormality. The size of the difference can be pre-determined by a preset threshold. A difference calculation is performed between the front-end temperature and the front-end reference temperature. If the result of the calculation is greater than the preset threshold, it means that the difference is large; otherwise, the difference is small.

[0086] Furthermore, if it is determined that there is an abnormality in the median deviation generated by the front-end and rear-end temperature difference timing diagram, or there is an abnormality in the front-end temperature of the main shaft in the front-end thermal comparison diagram relative to the front-end reference temperature, or there is an abnormality in the rear-end temperature of the main shaft in the rear-end thermal comparison diagram relative to the rear-end reference temperature, then it is indicated that there is indeed an abnormality in the temperature rise of the generator, and therefore the authenticity verification of the abnormality of the generator temperature rise is judged to have passed. On the contrary, if there is no abnormality in the median deviation, there is no abnormality in the front-end temperature of the main shaft in the front-end thermal comparison diagram relative to the front-end reference temperature, and there is no abnormality in the rear-end temperature of the main shaft in the rear-end thermal comparison diagram relative to the rear-end reference temperature, then there is no abnormality in the generator temperature rise, and therefore the authenticity verification of the abnormality of the generator temperature rise is judged to have failed, which further indicates that the detection of the preset detection model that monitors the abnormality of the generator temperature rise is inaccurate, and thus a prompt message for optimizing the preset detection model is output, and the accuracy of its detection is improved by optimizing the preset detection model.

[0087] Step S32: If the authenticity of the abnormal temperature rise of the generator is verified, a first risk value, a second risk value, and a third risk value are generated according to the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram, and a first maintenance measure, a second maintenance measure, and a third maintenance measure are generated respectively;

[0088] Step S33: determining the risk value and the reference maintenance measure according to the first risk value, the second risk value, the third risk value, and the first maintenance measure, the second maintenance measure, and the third maintenance measure.

[0089] Furthermore, for generators whose temperature rise anomalies are verified, a first risk value and a first maintenance measure are generated based on the front-end and rear-end temperature difference time series diagram. The risk value corresponding to the front-end and rear-end temperature difference time series diagram reflects the degree of abnormality in the generator temperature rise and possible maintenance measures. Simultaneously, a second risk value and a second maintenance measure are generated based on the front-end thermal comparison diagram. The risk value corresponding to the front-end thermal comparison diagram reflects the degree of abnormality in the generator temperature rise and possible maintenance measures. Furthermore, a third risk value and a third maintenance measure are generated based on the rear-end thermal comparison diagram. The risk value corresponding to the rear-end thermal comparison diagram reflects the degree of abnormality in the generator temperature rise and possible maintenance measures.

[0090] Furthermore, because the risks represented by the first risk value, the second risk value, and the third risk value are different, it is necessary to determine an overall risk value based on the three. At the same time, the maintenance methods represented by the first maintenance measure, the second maintenance measure, and the third maintenance measure are also different, and it is also necessary to determine an overall reference maintenance measure based on the three. Specifically, the steps of determining the risk value and the reference maintenance measure based on the first risk value, the second risk value, the third risk value, and the first maintenance measure, the second maintenance measure, and the third maintenance measure include:

[0091] Step b1, comparing the first risk value, the second risk value, and the third risk value, and determining the maximum value as the risk value;

[0092] Step b2: performing a union operation on the first maintenance measure, the second maintenance measure, and the third maintenance measure, and obtaining a union operation result as the reference maintenance measure.

[0093] Furthermore, the first, second, and third risk values ​​each represent different levels of risk, with larger values ​​indicating greater risk. Therefore, the first, second, and third risk values ​​can be compared to determine the largest overall risk value. The first, second, and third maintenance measures represent the repair methods for possible faults. To ensure comprehensiveness, the first, second, and third maintenance measures are combined to form a union, resulting in a comprehensive reference maintenance measure.

[0094] This embodiment establishes a verification mechanism for abnormal generator temperature rise based on the front-end and rear-end temperature difference time series diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram, thereby enhancing the accuracy of the predictive detection model. Furthermore, for any verified generator temperature rise anomalies, the front-end and rear-end temperature difference time series diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram determine an overall risk value to accurately reflect the risk of the generator experiencing abnormal temperature rise. Comprehensive reference maintenance measures are also determined for maintenance personnel to quickly eliminate the anomaly and proceed with repairs.

[0095] Furthermore, based on the first or second embodiment of the method for early warning of temperature rise of a generator in a wind power generation system of the present invention, a third embodiment of the method for early warning of temperature rise of a generator in a wind power generation system of the present invention is proposed.

[0096] The third embodiment of the method for early warning of temperature rise of a generator in a wind power generation system differs from the first or second embodiment of the method for early warning of temperature rise of a generator in a wind power generation system in that the steps of respectively generating a first risk value, a second risk value, and a third risk value based on the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram include:

[0097] Step S321: Compare the median deviation in the front-end and rear-end temperature difference time series diagram with each first preset numerical interval to determine the first target numerical interval in which the median deviation is located, and determine the first risk value based on the first preset risk value corresponding to the first target numerical interval;

[0098] Step S322: determining a front-end average difference between the front-end temperature of the spindle and the front-end reference temperature, comparing the front-end average difference with each second preset numerical interval, determining a second target numerical interval within which the front-end average difference falls, and determining a second risk value based on a second preset risk value corresponding to the second target numerical interval;

[0099] Step S323, determine the rear end average difference size of the rear end temperature of the spindle relative to the rear end reference temperature, and compare the rear end average difference size with each third preset numerical interval, determine the third target numerical interval in which the rear end average difference size is located, and determine the third risk value based on the third preset risk value corresponding to the third target numerical interval.

[0100] After verifying that the generator does have an abnormal temperature rise, this embodiment generates risk values ​​that reflect the degree of impact of the abnormal generator temperature rise on the normal operation of the wind turbine based on the front-end and rear-end temperature difference time series diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram. Among them, for the front-end and rear-end temperature difference time series diagram, the greater the deviation between the median and the median generated by the reference median, the higher the degree of abnormality in the generator temperature rise. For the front-end thermal comparison diagram, the greater the difference between the front-end temperature of the main shaft and the front-end reference temperature, the higher the degree of abnormality in the generator temperature rise. For the rear-end thermal comparison diagram, the greater the difference between the rear-end temperature of the main shaft and the rear-end reference temperature, the higher the degree of abnormality in the generator temperature rise.

[0101] Furthermore, for the front-end and rear-end temperature difference timing diagram, a plurality of first preset numerical intervals are pre-set, and different first preset numerical intervals correspond to different first preset risk values, reflecting different risk levels. The larger the boundary value of the first preset numerical interval, the larger the corresponding first preset risk value, and the higher the risk level represented. The median deviation generated by the median and the reference median in the front-end and rear-end temperature difference timing diagram is compared with each first preset numerical interval, and the first preset numerical interval in which the median deviation falls is determined as the first target numerical interval. Then, based on the correspondence between each first preset numerical interval and each first preset risk value, the first preset risk value corresponding to the first target numerical interval is determined. The first preset risk value is the first risk value corresponding to the front-end and rear-end temperature difference timing diagram, indicating the level of risk reflected by the front-end and rear-end temperature difference timing diagram for a generator with abnormal temperature rise.

[0102] Furthermore, because the front-end thermal comparison map contains multiple front-end temperatures of the fan main shaft, i.e., multiple front-end reference temperatures, there are also multiple front-end differences between the main shaft front-end temperature and the front-end reference temperature. To accurately reflect the magnitude of these differences, these multiple front-end differences are generated as a front-end average value, which is used as the front-end average difference between the main shaft front-end temperature and the front-end reference temperature. Similarly, the front-end thermal comparison map is pre-set with multiple second preset numerical intervals. Different second preset numerical intervals correspond to different second preset risk values, reflecting different risk levels. Larger boundary values ​​in the second preset numerical intervals correspond to larger second preset risk values, indicating a higher risk level. The front-end average difference is compared with each second preset numerical interval, and the second preset numerical interval within which the front-end average difference falls is determined as the second target numerical interval. Based on the correspondence between each second preset numerical interval and each second preset risk value, the second preset risk value corresponding to the second target numerical interval is determined. This second preset risk value is then the second risk value corresponding to the front-end thermal comparison map, indicating the risk level of the generator experiencing abnormal temperature rise as reflected by the front-end thermal comparison map.

[0103] Similarly, the rear-end thermal comparison map contains multiple rear-end temperatures of the fan main shaft, i.e., multiple rear-end reference temperatures. Consequently, there are multiple rear-end differences between the rear-end shaft temperature and the rear-end reference temperature. To accurately reflect the magnitude of these differences, these multiple rear-end differences are generated as a rear-end average value, which is used as the rear-end average difference between the rear-end shaft temperature and the rear-end reference temperature. Similarly, the rear-end thermal comparison map is pre-set with multiple third preset numerical intervals. Different third preset numerical intervals correspond to different third preset risk values, reflecting different risk levels. Larger boundary values ​​within the third preset numerical intervals correspond to larger third preset risk values, indicating a higher risk level. The rear-end average difference is compared with each third preset numerical interval, and the third preset numerical interval within which the rear-end average difference falls is determined as the third target numerical interval. Based on the correspondence between each third preset numerical interval and each third preset risk value, the third preset risk value corresponding to the third target numerical interval is determined. This third preset risk value is then used as the third risk value for the rear-end thermal comparison map, indicating the risk level of the generator experiencing abnormal temperature rise as reflected by the rear-end thermal comparison map.

[0104] This embodiment determines respective risk values ​​for the front and rear shield temperature difference timing diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram, indicating the level of risk of a generator with abnormal temperature rise as reflected by the front-end and rear-end temperature difference timing diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram, respectively. This makes the risk value ultimately determined by the three more accurate, accurately reflects the level of risk, and thereby improves the accuracy of the generator temperature rise abnormality warning.

[0105] In addition, an embodiment of the present invention also provides a wind power generation system. Figure 6 , Figure 6 It is a structural diagram of the equipment hardware operating environment involved in the embodiment of the wind power generation system of the present invention.

[0106] like Figure 6 As shown, the wind power generation system may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the user interface 1003 may optionally include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may optionally be a storage device independent of the aforementioned processor 1001.

[0107] Those skilled in the art will understand that Figure 6 The hardware structure of the wind power generation system shown in the figure does not constitute a limitation on the wind power generation system, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0108] like Figure 6 As shown, the memory 1005, which is a readable storage medium, may include an operating system, a network communication module, a user interface module, and a control program. The operating system is a program that manages and controls the wind power generation system and software resources, and supports the operation of the network communication module, the user interface module, the control program, and other programs or software. The network communication module is used to manage and control the network interface 1004; and the user interface module is used to manage and control the user interface 1003.

[0109] exist Figure 6 In the hardware structure of the wind power generation system shown, the network interface 1004 is mainly used to connect to the backend server and communicate data with the backend server; the user interface 1003 is mainly used to connect to the client (user end) and communicate data with the client; the processor 1001 can call the control program stored in the memory 1005 and perform the following operations:

[0110] When a temperature rise abnormality is detected in a generator of any wind turbine in the wind power generation system based on a preset detection model, the front-end temperature and the rear-end temperature of the main shaft corresponding to the abnormal temperature rise of the generator are obtained during the abnormal period;

[0111] Generate a front-end and rear-end temperature difference time sequence diagram, a front-end thermal comparison diagram, and a rear-end thermal comparison diagram according to the front-end temperature and the rear-end temperature;

[0112] Determining the risk value and reference maintenance measures corresponding to the abnormal temperature rise of the generator based on the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram;

[0113] Acquire historical warning information corresponding to the abnormal temperature rise of the generator, generate warning information by combining the historical warning information, the risk value and reference maintenance measures, and issue a warning of the abnormal temperature rise of the generator based on the warning information.

[0114] Furthermore, the steps of generating a front-end and rear-end temperature difference timing diagram, a front-end thermal comparison diagram, and a rear-end thermal comparison diagram respectively according to the front-end temperature and the rear-end temperature include:

[0115] Generating the front-end temperature and the back-end temperature into a temperature difference time series curve, and obtaining a historical temperature difference time series curve generated based on the front-end historical temperature data and the back-end historical temperature data;

[0116] Generate the front-end and rear-end temperature difference timing diagram based on the temperature difference timing curve and the historical temperature difference timing curve based on a preset timing diagram template;

[0117] Obtaining the rotational speed of the main shaft during the abnormal period, and the reference rotational speed, front-end reference temperature, and rear-end reference temperature of the main shaft of a wind turbine in a generator in the wind power generation system that does not have abnormal temperature rise during the abnormal period;

[0118] The front-end thermal comparison diagram and the rear-end thermal comparison diagram are generated according to the reference rotational speed, the front-end reference temperature and the rear-end reference temperature, and the rotational speed, the front-end temperature and the rear-end temperature.

[0119] Furthermore, the step of generating the front-end thermal comparison map and the rear-end thermal comparison map according to the reference speed, the front-end reference temperature and the rear-end reference temperature, and the front-end temperature and the rear-end temperature includes:

[0120] generating a front-end reference thermal map by using the reference speed and the front-end reference temperature, and adding the front-end temperature to the front-end reference thermal map according to a corresponding relationship between the speed and the reference speed to generate the front-end thermal comparison map;

[0121] The reference speed and the rear-end reference temperature are generated as a rear-end reference thermal map, and according to the corresponding relationship between the speed and the reference speed, the rear-end temperature is added to the rear-end reference thermal map to generate the rear-end thermal comparison map.

[0122] Furthermore, the step of determining the risk value and reference maintenance measures corresponding to the abnormal temperature rise of the generator based on the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram includes:

[0123] Verify the authenticity of the abnormal temperature rise of the generator based on the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram;

[0124] If the authenticity of the abnormal temperature rise of the generator is verified, a first risk value, a second risk value, and a third risk value are generated respectively according to the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram, and a first maintenance measure, a second maintenance measure, and a third maintenance measure are generated respectively;

[0125] The risk value and the reference maintenance measure are determined according to the first risk value, the second risk value, the third risk value, and the first maintenance measure, the second maintenance measure, and the third maintenance measure.

[0126] Furthermore, the step of verifying the authenticity of the abnormal temperature rise of the generator based on the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram includes:

[0127] Obtaining the median of the temperature difference timing curve in the front-end and rear-end temperature difference timing diagram and the reference median of the historical temperature difference timing curve;

[0128] Generating a median deviation from the median and a reference median, and determining whether the median deviation is abnormal;

[0129] Determine whether the front end temperature of the spindle is abnormal relative to the front end reference temperature of the front end thermal comparison diagram in the area with the same rotational speed value in the front end thermal comparison diagram;

[0130] Determine whether the rear end temperature of the spindle is abnormal relative to the rear end reference temperature of the rear end thermal comparison diagram in the region with the same rotational speed value in the rear end thermal comparison diagram;

[0131] If the median deviation is abnormal, and / or the front end temperature of the main shaft is abnormal relative to the front end reference temperature, and / or the rear end temperature of the main shaft is abnormal relative to the rear end reference temperature, then the authenticity of the generator temperature rise abnormality is determined to be verified.

[0132] Furthermore, the step of determining the risk value and the reference maintenance measure based on the first risk value, the second risk value, the third risk value, and the first maintenance measure, the second maintenance measure, and the third maintenance measure includes:

[0133] comparing the first risk value, the second risk value, and the third risk value, and determining a maximum value as the risk value;

[0134] Perform a union operation on the first maintenance measure, the second maintenance measure, and the third maintenance measure, and obtain a union operation result as the reference maintenance measure.

[0135] Furthermore, the step of generating a first risk value, a second risk value, and a third risk value respectively according to the front-end and rear-end temperature difference timing diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram includes:

[0136] Comparing the median deviation in the front-end and rear-end temperature difference time series diagram with each first preset numerical interval, determining a first target numerical interval in which the median deviation is located, and determining the first risk value based on a first preset risk value corresponding to the first target numerical interval;

[0137] determining a front average difference in the front end temperature of the spindle relative to the front end reference temperature, comparing the front average difference with each second preset numerical interval, determining a second target numerical interval within which the front average difference falls, and determining a second risk value based on a second preset risk value corresponding to the second target numerical interval;

[0138] Determine the rear end average difference size of the rear end temperature of the spindle relative to the rear end reference temperature, and compare the rear end average difference size with each third preset numerical interval to determine the third target numerical interval in which the rear end average difference size is located, and determine the third risk value based on the third preset risk value corresponding to the third target numerical interval.

[0139] Furthermore, the reference maintenance measures at least include detecting the operating status of the temperature sensor corresponding to the main shaft, detecting the operating status of the cooling fan of the generator with abnormal temperature, detecting whether there is any operating abnormality in the main bearing corresponding to the main shaft, and detecting whether there is any lubrication abnormality in the main bearing.

[0140] The specific implementation of the wind power generation system of the present invention is basically the same as the embodiments of the early warning method for temperature rise of the generator in the wind power generation system described above, and will not be described in detail here.

[0141] An embodiment of the present invention further provides a storage medium having a control program stored thereon, which, when executed by a processor, implements the steps of the above-mentioned method for early warning of temperature rise of a generator in a wind power generation system.

[0142] The storage medium of the present invention may be a computer-readable storage medium, and its specific implementation is substantially the same as the embodiments of the above-mentioned method for early warning of temperature rise of a generator in a wind power generation system, and will not be described in detail here.

[0143] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of the present invention, or directly or indirectly used in other related technical fields, all fall within the protection of the present invention.

Claims

1. A method for early warning of generator temperature rise in a wind power generation system, characterized in that: The early warning method includes: When a temperature rise abnormality is detected in a generator of any wind turbine in the wind power generation system based on a preset detection model, the front-end temperature and the rear-end temperature of the main shaft corresponding to the abnormal temperature rise of the generator are obtained during the abnormal period; Generate a front-end and rear-end temperature difference time sequence diagram, a front-end thermal comparison diagram, and a rear-end thermal comparison diagram according to the front-end temperature and the rear-end temperature; Determining the risk value and reference maintenance measures corresponding to the abnormal temperature rise of the generator based on the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram; Acquire historical warning information corresponding to the abnormal temperature rise of the generator, generate warning information by combining the historical warning information, the risk value, and reference maintenance measures, and issue a warning of the abnormal temperature rise of the generator based on the warning information; The step of determining the risk value and reference maintenance measures corresponding to the abnormal temperature rise of the generator based on the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram includes: Verify the authenticity of the abnormal temperature rise of the generator based on the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram; If the authenticity of the abnormal temperature rise of the generator is verified, a first risk value, a second risk value, and a third risk value are generated respectively according to the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram, and a first maintenance measure, a second maintenance measure, and a third maintenance measure are generated respectively; Determining the risk value and the reference maintenance measure according to the first risk value, the second risk value, the third risk value, and the first maintenance measure, the second maintenance measure, and the third maintenance measure; The step of verifying the authenticity of the abnormal temperature rise of the generator based on the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram includes: Obtaining the median of the temperature difference timing curve in the front-end and rear-end temperature difference timing diagram and the reference median of the historical temperature difference timing curve; Generating a median deviation from the median and a reference median, and determining whether the median deviation is abnormal; Determine whether the front end temperature of the spindle is abnormal relative to the front end reference temperature of the front end thermal comparison diagram in the area with the same rotational speed value in the front end thermal comparison diagram; Determine whether the rear end temperature of the spindle is abnormal relative to the rear end reference temperature of the rear end thermal comparison diagram in the region with the same rotational speed value in the rear end thermal comparison diagram; If the median deviation is abnormal, and / or the front end temperature of the main shaft is abnormal relative to the front end reference temperature, and / or the rear end temperature of the main shaft is abnormal relative to the rear end reference temperature, then the authenticity of the generator temperature rise abnormality is determined to be verified.

2. The early warning method according to claim 1, characterized in that: The step of generating a front-end and rear-end temperature difference timing diagram, a front-end thermal comparison diagram, and a rear-end thermal comparison diagram according to the front-end temperature and the rear-end temperature respectively comprises: Generating the front-end temperature and the back-end temperature into a temperature difference time series curve, and obtaining a historical temperature difference time series curve generated based on the front-end historical temperature data and the back-end historical temperature data; Generate the front-end and rear-end temperature difference timing diagram based on the temperature difference timing curve and the historical temperature difference timing curve based on a preset timing diagram template; Obtaining the rotational speed of the main shaft during the abnormal period, and the reference rotational speed, front-end reference temperature, and rear-end reference temperature of the main shaft of a wind turbine in a generator in the wind power generation system that does not have abnormal temperature rise during the abnormal period; The front-end thermal comparison diagram and the rear-end thermal comparison diagram are generated according to the reference rotational speed, the front-end reference temperature and the rear-end reference temperature, and the rotational speed, the front-end temperature and the rear-end temperature.

3. The early warning method according to claim 2, characterized in that: The step of generating the front-end thermal comparison map and the rear-end thermal comparison map according to the reference speed, the front-end reference temperature and the rear-end reference temperature, and the front-end temperature and the rear-end temperature includes: generating a front-end reference thermal map by using the reference speed and the front-end reference temperature, and adding the front-end temperature to the front-end reference thermal map according to a corresponding relationship between the speed and the reference speed to generate the front-end thermal comparison map; The reference speed and the rear-end reference temperature are generated as a rear-end reference thermal map, and according to the corresponding relationship between the speed and the reference speed, the rear-end temperature is added to the rear-end reference thermal map to generate the rear-end thermal comparison map.

4. The early warning method according to claim 1, wherein: The step of determining the risk value and the reference maintenance measure according to the first risk value, the second risk value, the third risk value, and the first maintenance measure, the second maintenance measure, and the third maintenance measure includes: comparing the first risk value, the second risk value, and the third risk value, and determining a maximum value as the risk value; Perform a union operation on the first maintenance measure, the second maintenance measure, and the third maintenance measure, and obtain a union operation result as the reference maintenance measure.

5. The early warning method according to claim 1, characterized in that: The step of generating a first risk value, a second risk value, and a third risk value respectively according to the front-end and rear-end temperature difference time sequence diagram, the front-end thermal comparison diagram, and the rear-end thermal comparison diagram includes: Comparing the median deviation in the front-end and rear-end temperature difference time series diagram with each first preset numerical interval, determining a first target numerical interval in which the median deviation is located, and determining the first risk value based on a first preset risk value corresponding to the first target numerical interval; determining a front average difference in the front end temperature of the spindle relative to the front end reference temperature, comparing the front average difference with each second preset numerical interval, determining a second target numerical interval within which the front average difference falls, and determining a second risk value based on a second preset risk value corresponding to the second target numerical interval; Determine the rear end average difference size of the rear end temperature of the spindle relative to the rear end reference temperature, and compare the rear end average difference size with each third preset numerical interval to determine the third target numerical interval in which the rear end average difference size is located, and determine the third risk value based on the third preset risk value corresponding to the third target numerical interval.

6. The early warning method according to any one of claims 1 to 5, characterized in that: The reference maintenance measures at least include detecting the operating status of the temperature sensor corresponding to the main shaft, detecting the operating status of the cooling fan of the generator with abnormal temperature, detecting whether the main bearing corresponding to the main shaft has operating abnormalities, and detecting whether the main bearing has lubrication abnormalities.

7. A wind power generation system, characterized in that: The wind power generation system includes: a memory, a processor, a communication bus, and a control program stored in the memory: The communication bus is used to realize the connection and communication between the processor and the memory; The processor is configured to execute the control program to implement the steps of the method for early warning of temperature rise of a generator in a wind power generation system according to any one of claims 1 to 5.

8. A storage medium, characterized in that: The storage medium stores a control program, which, when executed by the processor, implements the steps of the method for early warning of temperature rise of a generator in a wind power generation system according to any one of claims 1 to 5.

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