WO2024152467A1 - 一种双馈异步风力发电机轴承电腐蚀故障检测方法及系统 - Google Patents

一种双馈异步风力发电机轴承电腐蚀故障检测方法及系统 Download PDF

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Publication number
WO2024152467A1
WO2024152467A1 PCT/CN2023/090675 CN2023090675W WO2024152467A1 WO 2024152467 A1 WO2024152467 A1 WO 2024152467A1 CN 2023090675 W CN2023090675 W CN 2023090675W WO 2024152467 A1 WO2024152467 A1 WO 2024152467A1
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Prior art keywords
generator
shaft
bearing
current density
conductivity
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English (en)
French (fr)
Inventor
马勇
李冲
邓巍
那红宇
郭靖
张长安
张轶东
魏海锋
范玄方
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G01M13/04—Bearings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G01M13/04—Bearings
    • G01M13/045—Acoustic or vibration analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • the present disclosure relates to the field of wind power generation equipment fault diagnosis, and in particular to a double-fed asynchronous wind generator bearing electrical corrosion fault detection method and system, electronic equipment, readable storage medium, computer program product and computer program.
  • DFIG Doubly Fed Induction Generator
  • Wind turbines are installed at high altitudes, with complex operating environments and frequent failures. Their maintenance and repair are complex and costly. Bearing failures account for a large proportion of wind turbine failures.
  • the causes of bearing damage include poor lubrication, shaft current corrosion, load oscillation, etc. Most of the causes of bearing failure can be avoided through certain maintenance methods and status monitoring operations, but bearing damage caused by shaft current cannot be eliminated by similar methods.
  • Shaft current is also called bearing electrical corrosion.
  • the common-mode voltage generated by the converter switch power supply in the doubly-fed asynchronous wind turbine system is the root cause of the shaft current problem, and the coupling capacitor inside the generator provides a low-impedance path for the conduction of the common-mode voltage.
  • the rotor side is connected to the converter, which will generate a high-frequency pulse common-mode voltage between the rotor winding and the ground.
  • the rotor of the doubly-fed asynchronous wind turbine is a wound rotor structure. There are four conductors inside the generator: stator winding, rotor winding, stator core and rotor core.
  • the CMS (Content Management System) vibration monitoring system is mainly used to analyze the state of the doubly fed wind turbine bearings in operation.
  • the measurement position is located on the housing of two bearings in accordance with the requirements of VID 3834 "Measurement and evaluation of mechanical vibration of wind turbines and their components", which is divided into three directions: axial, radial and vertical.
  • the vibration acceleration of 10-5000Hz and the effective value of acceleration of 10-1000Hz are measured, and the fault characteristic frequency is extracted by spectrum and envelope analysis of the data to evaluate the bearing status.
  • the bearing fault can be preliminarily analyzed by comparing the fault characteristic frequency unique to the corresponding bearing model with the extracted fault characteristic frequency. However, it cannot explain the cause of the fault of the component.
  • the main method to determine the cause of bearing failure is to disassemble the bearings of the doubly-fed asynchronous wind turbine and perform bearing failure analysis, including damage trace comparison, electron microscope observation, etc., which is expensive and time-consuming, and is not conducive to the timely adjustment of the production and operation plan of the wind farm, and brings hidden dangers to the safe operation of the wind turbine.
  • the present invention provides a method and system for detecting electrical corrosion faults in the bearings of a doubly-fed asynchronous wind turbine generator, an electronic device, a readable storage medium, a computer program product and a computer program, so as to at least solve the technical problems that the cost and cycle of determining the cause of the bearing fault are high, which is not conducive to the timely adjustment of the production and operation plan of the wind farm, and at the same time brings hidden dangers to the safe operation of the wind turbine.
  • the first embodiment of the present disclosure provides a method for detecting electrical corrosion faults of bearings of a doubly-fed asynchronous wind turbine generator, the method comprising:
  • the CMS vibration monitoring system monitors the operating status of the double-fed asynchronous wind turbine generator bearings in real time
  • a high internal resistance millivoltmeter is used to measure the shaft voltage of the generator, and an eddy current conductivity meter is used to measure the shaft conductivity of the generator;
  • Whether the generator has a bearing electrical corrosion failure is determined based on the shaft current density of the generator shaft.
  • the method further includes: based on the vibration frequency of the generator bearing being greater than a preset alarm threshold, the CMS vibration monitoring system issues an early warning.
  • the positive electrode of the high internal resistance millivoltmeter is connected to the surface of the drive end shaft of the generator through a measuring carbon brush, and the negative electrode of the high internal resistance millivoltmeter is grounded through a grounding cable.
  • the measuring carbon brush is mounted on the bearing outer cover of the generator through a mounting bracket;
  • the number of carbon brushes to be measured is N, and N is an integer greater than or equal to 1.
  • the eddy current conductivity meter measures the conductivity of the shaft of the generator when the generator is stopped
  • the high internal resistance millivoltmeter measures the shaft voltage of the generator when the generator is in a grid-connected state.
  • judging whether the generator has a bearing electrical corrosion failure based on the shaft current density of the generator shaft includes:
  • the second aspect of the present disclosure provides a double-fed asynchronous wind generator bearing electrical corrosion fault detection system, the system comprising:
  • Monitoring module used to monitor the operating status of the bearings of the double-fed asynchronous wind turbine generator in real time through the CMS vibration monitoring system
  • a determination module configured to determine a shaft current density of a rotating shaft of the generator according to a shaft voltage and a rotating shaft conductivity of the generator
  • the judgment module is used to judge whether the generator has a bearing electrical corrosion fault based on the shaft current density of the generator shaft.
  • system further comprises:
  • the early warning module is used for the CMS vibration monitoring system to issue an early warning based on the vibration frequency of the generator bearing being greater than a preset alarm threshold.
  • the positive electrode of the high internal resistance millivoltmeter is connected to the surface of the drive end shaft of the generator through a measuring carbon brush, and the negative electrode of the high internal resistance millivoltmeter is grounded through a grounding cable.
  • An embodiment of the third aspect of the present disclosure proposes an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method for detecting electrical corrosion faults of bearings of a doubly-fed asynchronous wind generator according to any embodiment of the first aspect of the present disclosure.
  • the fourth aspect embodiment of the present disclosure proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable the computer to execute the method for detecting electrical corrosion faults of bearings of a doubly-fed asynchronous wind generator according to any embodiment of the first aspect of the present disclosure.
  • the sixth aspect of the present disclosure proposes a computer program, including a computer program code, which, when executed on a computer, enables the computer to execute a method for detecting electrical corrosion faults in a bearing of a doubly-fed asynchronous wind turbine generator as in any one of the first aspects of the present disclosure.
  • the present disclosure proposes a method and system for detecting electrical corrosion faults in the bearings of a doubly-fed asynchronous wind turbine generator, the method comprising: monitoring the operating status of the bearings of the doubly-fed asynchronous wind turbine generator in real time through a CMS vibration monitoring system; based on the vibration frequency of the generator bearing being greater than a preset alarm threshold, measuring the shaft voltage of the generator using a high internal resistance millivoltmeter, and measuring the shaft conductivity of the generator using an eddy current conductivity meter; determining the shaft current density of the generator shaft according to the shaft voltage and shaft conductivity of the generator; and judging whether the generator has electrical corrosion faults in the bearings based on the shaft current density of the generator shaft.
  • the technical solution proposed in the present disclosure can more conveniently realize the diagnosis of shaft current corrosion faults in the bearings of wind turbine generators, facilitate the wind farm to adjust the production and operation plan, promptly deal with hidden faults of the unit, and ensure the safe operation of the wind turbine unit.
  • FIG1 is a flow chart of a method for detecting electrical corrosion faults in a bearing of a doubly-fed asynchronous wind turbine generator according to an embodiment of the present disclosure
  • FIG2 is a schematic diagram of shaft voltage measurement according to an embodiment of the present disclosure
  • FIG3 is a schematic diagram of shaft current density measurement according to an embodiment of the present disclosure.
  • FIG4 is a detailed flow chart of a method for detecting electrical corrosion faults of a bearing of a doubly-fed asynchronous wind turbine generator according to an embodiment of the present disclosure
  • FIG5 is a first structural diagram of a doubly-fed asynchronous wind generator bearing electrical corrosion fault detection system provided according to an embodiment of the present disclosure
  • FIG6 is a second structural diagram of a doubly-fed asynchronous wind generator bearing electrical corrosion fault detection system provided according to an embodiment of the present disclosure.
  • the disclosed embodiment proposes a method and system for detecting electrical corrosion faults in the bearings of a doubly-fed asynchronous wind turbine generator, an electronic device, a readable storage medium, a computer program product, and a computer program.
  • the method comprises: monitoring the operating state of the bearings of the doubly-fed asynchronous wind turbine generator in real time through a CMS vibration monitoring system; When the alarm threshold is set, the shaft voltage of the generator is measured by a high internal resistance millivoltmeter, and the shaft conductivity of the generator is measured by an eddy current conductivity meter; the shaft current density of the generator shaft is determined according to the shaft voltage and shaft conductivity of the generator; and whether the generator has a bearing electrical corrosion failure is determined based on the shaft current density of the generator shaft.
  • the technical solution proposed in the embodiment of the present disclosure can more conveniently realize the diagnosis of the shaft current corrosion failure of the wind turbine bearing, facilitate the wind farm to adjust the production and operation plan, promptly deal with the hidden dangers of the unit failure, and ensure the safe operation of the wind turbine unit.
  • FIG1 is a flow chart of a method for detecting electrical corrosion faults in a bearing of a doubly-fed asynchronous wind turbine generator according to an embodiment of the present disclosure. As shown in FIG1 , the method includes steps 1 to 4.
  • Step 1 Monitor the operating status of the doubly-fed asynchronous wind turbine generator bearings in real time through the CMS vibration monitoring system.
  • Step 2 When the vibration frequency of the generator bearing is greater than a preset alarm threshold, a high internal resistance millivoltmeter is used to measure the shaft voltage of the generator, and an eddy current conductivity meter is used to measure the shaft conductivity of the generator.
  • the step 2 also includes: when the vibration frequency of the generator bearing is greater than a preset alarm threshold, the CMS vibration monitoring system issues an early warning.
  • the positive electrode of the high internal resistance millivoltmeter is connected to the surface of the drive end shaft of the generator through a measuring carbon brush, and the negative electrode of the high internal resistance millivoltmeter is grounded through a grounding cable;
  • the measuring carbon brush is installed on the bearing outer cover of the generator through a mounting bracket, and the number of the measuring carbon brushes is N, where N is an integer greater than or equal to 1.
  • the eddy current conductivity meter measures the conductivity of the shaft of the generator when the generator is stopped
  • the high internal resistance millivoltmeter measures the shaft voltage of the generator when the generator is in a grid-connected state.
  • the high internal resistance millivoltmeter connects the positive electrode of the millivoltmeter to the surface of the generator drive end shaft through the measuring carbon brush. It is necessary to ensure that the measuring carbon brush is in full contact with the shaft surface, and the contact area is not less than 85%; the measuring carbon brush is installed on the generator bearing cover through the mounting bracket. To improve the measurement accuracy, multiple measuring carbon brushes can be installed when the installation conditions permit; the negative electrode of the millivoltmeter is grounded through the grounding cable to form a shaft voltage measurement circuit.
  • the conductivity of the generator shaft is directly measured by an eddy current conductivity meter, and the measuring instrument and measurement method shall comply with the provisions of GB/T 35392-2017.
  • Step 3 determining the shaft current density of the generator shaft according to the shaft voltage and shaft conductivity of the generator.
  • J is the shaft current density of the generator shaft
  • U is the shaft voltage of the generator
  • ⁇ is the shaft conductivity of the generator.
  • E is the electric field strength
  • J is the current density
  • ⁇ is the conductivity
  • Step 4 determine whether the generator has a bearing electrical corrosion failure based on the shaft current density of the generator shaft.
  • step 4 includes:
  • the electrical corrosion failure of the bearing is related to the current density of the bearing contact point, that is, the current passing through the bearing divided by the total contact area between the rolling element and the inner ring or outer ring raceway, which is related to the bearing model and operating conditions.
  • the operating conditions of the bearing are affected by multiple parameters such as load, working clearance, and thickness of the lubricating oil film, and it is difficult to calculate accurately. According to the actual engineering experience currently available, when the shaft current density passing through the bearing is less than 0.1A/ mm2 , it will not cause damage to the bearing; when the shaft current density passing through the bearing is greater than 1A/ mm2 , obvious potential grooves will appear in the bearing.
  • the wind turbine bearing and the shaft are interference fit.
  • the generator bearing vibration exceeds the fault alarm threshold and the shaft current density passing through the generator shaft exceeds a certain threshold, it can be judged that the generator bearing has a shaft current corrosion fault.
  • Step S1 monitor the operating status of the generator bearing through the CMS vibration monitoring system. When the vibration of the generator bearing exceeds the set alarm threshold, the CMS system issues an early warning.
  • Step S2 After the CMS system issues an early warning for the vibration of the generator bearing, an eddy current conductivity meter is used to measure the conductivity of the generator shaft in a shutdown state.
  • Step S3 after the CMS system issues an early warning for the generator bearing vibration, the generator shaft voltage is measured when the generator is in a grid-connected state.
  • Step S4 analyzing and calculating the measurement results obtained in steps S2 and S3 to obtain the shaft current density of the generator shaft.
  • Step S5 When the shaft current density calculated in step S4 exceeds the set threshold, it is determined that the generator bearing has a shaft current corrosion failure, and the bearing is replaced.
  • the present embodiment proposes a method for detecting electrical corrosion faults in the bearings of a doubly-fed asynchronous wind turbine generator, which performs vibration monitoring and analysis on the bearings of the wind turbine generator to determine whether the bearings of the generator generator are faulty; when the bearings of the generator generator are faulty, the shaft current density passing through the shaft voltage and conductivity is measured and calculated; based on the shaft current density passing through the shaft of the generator, it is determined whether the bearings of the generator generator are faulty due to shaft current corrosion.
  • This makes it easier to diagnose shaft current corrosion faults in the bearings of wind turbine generators, facilitates the wind farm to adjust its production and operation plan, and promptly handles hidden faults of the unit to ensure the safe operation of the wind turbine unit.
  • FIG5 is a structural diagram of a doubly-fed asynchronous wind generator bearing electrical corrosion fault detection system provided according to an embodiment of the present disclosure. As shown in FIG5 , the system includes a monitoring module 100 , a measuring module 200 , a determining module 300 , and a judging module 400 .
  • the monitoring module 100 is used to monitor the operating status of the bearings of the double-fed asynchronous wind turbine generator in real time through the CMS vibration monitoring system.
  • the measuring module 200 is used to measure the shaft voltage of the generator using a high internal resistance millivoltmeter and measure the shaft conductivity of the generator using an eddy current conductivity meter when the vibration frequency of the generator bearing is greater than a preset alarm threshold.
  • the determination module 300 is used to determine the shaft current density of the generator shaft according to the shaft voltage and shaft conductivity of the generator.
  • the judgment module 400 is used to judge whether the generator has a bearing electrical corrosion fault based on the shaft current density of the generator shaft.
  • the system further includes an early warning module 500 .
  • the early warning module 500 is used for the CMS vibration monitoring system to issue an early warning when the vibration frequency of the generator bearing is greater than a preset alarm threshold.
  • the positive electrode of the high internal resistance millivoltmeter is connected to the surface of the drive end shaft of the generator through a measuring carbon brush, and the negative electrode of the high internal resistance millivoltmeter is grounded through a grounding cable.
  • the measuring carbon brush is mounted on the bearing outer cover of the generator through a mounting bracket;
  • the number of carbon brushes to be measured is N, and N is an integer greater than or equal to 1.
  • the eddy current conductivity meter measures the conductivity of the shaft of the generator when the generator is stopped
  • the high internal resistance millivoltmeter measures the shaft voltage of the generator when the generator is in a grid-connected state.
  • J is the shaft current density of the generator shaft
  • U is the shaft voltage of the generator
  • ⁇ is the shaft conductivity of the generator.
  • the determination module 400 is specifically used for:
  • the doubly-fed asynchronous wind turbine bearing electrical corrosion fault detection system proposed in this embodiment can more conveniently realize the diagnosis of wind turbine bearing shaft current corrosion fault, facilitate the wind farm to adjust the production and operation plan, promptly deal with the hidden dangers of unit faults, and ensure the safe operation of the wind turbine.
  • the embodiments of the present disclosure also propose an electronic device, comprising at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method for detecting electrical corrosion faults of bearings of a doubly-fed asynchronous wind generator as shown in any embodiment of the present disclosure.
  • the embodiments of the present disclosure also propose a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable a computer to implement a method for detecting electrical corrosion faults in bearings of a doubly-fed asynchronous wind generator as shown in any embodiment of the present disclosure.
  • the embodiments of the present disclosure also propose a computer program, which includes computer program code.
  • the computer program code runs on a computer, the computer executes the method for detecting electrical corrosion faults of bearings of a doubly-fed asynchronous wind turbine generator shown in any embodiment of the present disclosure.
  • the present disclosure further proposes a computer program product.
  • the instruction processor in the computer program product is executed, the method for detecting electrical corrosion faults of the bearings of the doubly-fed asynchronous wind turbine generator proposed in the above embodiments of the present disclosure is executed.
  • Any process or method description described in the flowchart or otherwise herein may be understood to represent a module, segment or portion of code including one or more executable instructions for implementing the steps of a custom logic function or process, and the scope of the preferred embodiment of the present disclosure includes additional implementations, which may not be in the order shown or discussed, This includes executing functions in a substantially simultaneous manner or in a reverse order according to the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

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Abstract

提供了一种双馈异步风力发电机轴承电腐蚀故障检测方法及系统、电子设备、可读存储介质、计算机程序产品和计算机程序。所述方法包括：通过CMS振动监测系统实时监测双馈异步风力发电机轴承的运行状态；基于所述发电机轴承的振动频率大于预设的报警阈值，利用高内阻毫伏表测量所述发电机的轴电压，利用涡流电导率仪测量所述发电机的转轴电导率；根据所述发电机的轴电压和转轴电导率确定所述发电机转轴的轴电流密度；基于所述述发电机转轴的轴电流密度判断所述发电机是否发生轴承电腐蚀故障。

Description

一种双馈异步风力发电机轴承电腐蚀故障检测方法及系统
相关申请的交叉引用
本申请要求在2023年01月16日在中国提交的中国专利申请号2023100676742的优先权，其全部内容通过引用并入本文。
技术领域
本公开涉及风力发电设备故障诊断领域，具体涉及一种双馈异步风力发电机轴承电腐蚀故障检测方法及系统、电子设备、可读存储介质、计算机程序产品和计算机程序。
背景技术
双馈异步风力发电机(Doubly Fed Induction Generator,DFIG)是目前风力发电系统中的主流机型之一，具有变流器容量小、体积小、成本低、效率高等优点，受到众多风电设备制造商、运营商的青睐。
风力发电机安装于高空，运行环境复杂，故障多发，其维护和检修复杂且费用高昂。轴承故障在风力发电机故障中占有很大比例。而引起轴承损坏的原因包括润滑不良、轴电流腐蚀、负载振荡等。大部分轴承失效的原因可以通过一定的维护手段和状态监控操作得以避免，而轴电流引起的轴承损害却不能采取类似方法来消除。轴电流也称为轴承电腐蚀，当轴承内、外滚道之间的轴承电压超过其润滑油膜阈值电压而发生击穿时，会产生放电电流。瞬间放电释放的热量会造成润滑脂成分变性、恶化并使轴承表面产生坑蚀，逐渐引起轴承失效。
随着双馈异步风力发电机的广泛应用，其轴电流问题也不断出现。双馈异步风力发电机系统中变流器开关供电所产生的共模电压是轴电流问题的根源，而发电机内部存在的耦合电容为共模电压的传导提供了低阻抗通路。双馈异步风力发电机运行时转子侧接变流器，会在转子绕组和地之间产生高频脉冲共模电压。双馈异步风力发电机转子为绕线式转子结构，发电机内部存在定子绕组、转子绕组、定子铁心和转子铁心四个导体，各导体间都存在电容耦合。转子侧共模电压经过电容耦合产生轴电压。另一方面定子绕组通过变压器接网侧变流器时也会在定子绕组上产生共模电压。定子侧共模电压也会在电容耦合作用下产生轴电压。
相关技术中主要通过CMS(Content Management System)振动监测系统对运行中的双馈风力发电机轴承进行状态分析，其测量位置依照VID 3834《风力发电机及其组件机械振动的测量和评估》的要求位于两处轴承的壳体之上，分为轴向、径向、垂直三个方向分别 测取10～5000Hz的振动加速度、10～1000Hz的加速度有效值，通过对数据进行频谱、包络分析，提取故障特征频率，对轴承状态进行评估。当振动加速度、速度有效值超过VID 3834标准规定的限值，结合相应型号轴承所特有的故障特征频率与所提取的故障特征频率比对结果，可对轴承故障进行初步分析。但是无法说明该部件产生故障的原因。
目前，主要通过对双馈异步风力发电机轴承进行拆解进行轴承失效分析来判断轴承故障产生原因。包括损伤痕迹对照、电子显微镜观察等手段，费用高、周期长，不利于风电场及时调整生产运行计划，给风电机组的安全运行带来隐患。
发明内容
本公开提供一种双馈异步风力发电机轴承电腐蚀故障检测方法及系统、电子设备、可读存储介质、计算机程序产品和计算机程序，以至少解决在判断轴承故障产生原因时费用高、周期长，不利于风电场及时调整生产运行计划，同时给风电机组的安全运行带来隐患的技术问题。
本公开第一方面实施例提出一种双馈异步风力发电机轴承电腐蚀故障检测方法，所述方法包括：
通过CMS振动监测系统实时监测双馈异步风力发电机轴承的运行状态；
基于所述发电机轴承的振动频率大于预设的报警阈值，利用高内阻毫伏表测量所述发电机的轴电压，利用涡流电导率仪测量所述发电机的转轴电导率；
根据所述发电机的轴电压和转轴电导率确定所述发电机转轴的轴电流密度；
基于所述述发电机转轴的轴电流密度判断所述发电机是否发生轴承电腐蚀故障。
在一些实施例中，所述方法还包括：基于所述发电机轴承的振动频率大于预设的报警阈值，所述CMS振动监测系统发出预警。
在一些实施例中，所述高内阻毫伏表的测量正极通过测量碳刷连接至所述发电机的驱动端转轴表面，所述高内阻毫伏表的测量负极通过接地线缆接地。
在一些实施例中，所述测量碳刷通过安装支架安装于所述发电机的轴承外盖上；
其中，测量碳刷的个数为N，N为大于等于1的整数。
在一些实施例中，所述涡流电导率仪在所述发电机停止状态下测量发电机的转轴电导率；
所述高内阻毫伏表在所述发电机并网状态下测量发电机的轴电压。
在一些实施例中，所述发电机转轴的轴电流密度的计算式如下：
J＝Uσ/l
式中，J为发电机转轴的轴电流密度，U为发电机的轴电压，σ为发电机的转轴电导率。
在一些实施例中，所述基于所述述发电机转轴的轴电流密度判断所述发电机是否发生轴承电腐蚀故障，包括：
基于所述发电机转轴的轴电流密度大于预设的轴电流密度阈值，判定所述发电机发生轴承电腐蚀故障，否则，所述发电机未发生轴承电腐蚀故障。
本公开第二方面实施例提出一种双馈异步风力发电机轴承电腐蚀故障检测系统，所述系统包括：
监测模块，用于通过CMS振动监测系统实时监测双馈异步风力发电机轴承的运行状态；
测量模块，用于基于所述发电机轴承的振动频率大于预设的报警阈值，利用高内阻毫伏表测量所述发电机的轴电压，利用涡流电导率仪测量所述发电机的转轴电导率；
确定模块，用于根据所述发电机的轴电压和转轴电导率确定所述发电机转轴的轴电流密度；
判断模块，用于基于所述述发电机转轴的轴电流密度判断所述发电机是否发生轴承电腐蚀故障。
在一些实施例中，所述系统还包括：
预警模块，用于基于所述发电机轴承的振动频率大于预设的报警阈值，所述CMS振动监测系统发出预警。
在一些实施例中，所述高内阻毫伏表的测量正极通过测量碳刷连接至所述发电机的驱动端转轴表面，所述高内阻毫伏表的测量负极通过接地线缆接地。
本公开第三方面实施例提出了一种电子设备，包括：至少一个处理器；以及与所述至少一个处理器通信连接的存储器；其中，所述存储器存储有可被所述至少一个处理器执行的指令，所述指令被所述至少一个处理器执行，以使所述至少一个处理器能够执行本公开第一方面任一实施例的双馈异步风力发电机轴承电腐蚀故障检测方法。
本公开第四方面实施例提出了一种存储有计算机指令的非瞬时计算机可读存储介质，所述计算机指令用于使所述计算机执行本公开第一方面任一实施例的双馈异步风力发电机轴承电腐蚀故障检测方法。
本公开第五方面实施例提出了提出了一种计算机程序产品，包括计算机程序，所述计算机程序在被处理器执行时用于实现如本公开第一方面任一实施例的双馈异步风力发电机轴承电腐蚀故障检测方法。
本公开第六方面实施例提出了提出了一种计算机程序，包括计算机程序代码，当所述计算机程序代码在计算机上运行时，以使得计算机执行如本公开第一方面任一实施例的双馈异步风力发电机轴承电腐蚀故障检测方法。本公开的实施例提供的技术方案至少带来以下有益效果：
本公开提出了一种双馈异步风力发电机轴承电腐蚀故障检测方法及系统，所述方法包括：通过CMS振动监测系统实时监测双馈异步风力发电机轴承的运行状态；基于所述发电机轴承的振动频率大于预设的报警阈值，利用高内阻毫伏表测量所述发电机的轴电压，利用涡流电导率仪测量所述发电机的转轴电导率；根据所述发电机的轴电压和转轴电导率确定所述发电机转轴的轴电流密度；基于所述述发电机转轴的轴电流密度判断所述发电机是否发生轴承电腐蚀故障。本公开提出的技术方案，可较为便利的实现风力发电机轴承轴电流腐蚀故障的诊断，便于风电场调整生产运行计划，及时对机组故障隐患进行处理，保障风电机组安全运行。
本公开附加的方面以及优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本公开的实践了解到。
附图说明
本公开上述的和/或附加的方面以及优点从下面结合附图对实施例的描述中将变得明显和容易理解，其中：
图1为根据本公开一个实施例提供的一种双馈异步风力发电机轴承电腐蚀故障检测方法的流程图；
图2为根据本公开一个实施例提供的轴电压测量示意图；
图3为根据本公开一个实施例提供的轴电流密度测量示意图；
图4为根据本公开一个实施例提供的一种双馈异步风力发电机轴承电腐蚀故障检测方法的详细流程图；
图5为根据本公开一个实施例提供的一种双馈异步风力发电机轴承电腐蚀故障检测系统的第一种结构图；
图6为根据本公开一个实施例提供的一种双馈异步风力发电机轴承电腐蚀故障检测系统的第二种结构图。
具体实施方式
下面详细描述本公开的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本公开，而不能理解为对本公开的限制。
本公开实施例提出了一种双馈异步风力发电机轴承电腐蚀故障检测方法及系统、电子设备、可读存储介质、计算机程序产品和计算机程序。所述方法包括：通过CMS振动监测系统实时监测双馈异步风力发电机轴承的运行状态；当所述发电机轴承的振动频率大于预 设的报警阈值时，利用高内阻毫伏表测量所述发电机的轴电压，利用涡流电导率仪测量所述发电机的转轴电导率；根据所述发电机的轴电压和转轴电导率确定所述发电机转轴的轴电流密度；基于所述述发电机转轴的轴电流密度判断所述发电机是否发生轴承电腐蚀故障。本公开实施例提出的技术方案，可较为便利的实现风力发电机轴承轴电流腐蚀故障的诊断，便于风电场调整生产运行计划，及时对机组故障隐患进行处理，保障风电机组安全运行。
下面参考附图描述本公开实施例的一种双馈异步风力发电机轴承电腐蚀故障检测方法及系统。
实施例一
图1为根据本公开一个实施例提供的一种双馈异步风力发电机轴承电腐蚀故障检测方法的流程图，如图1所示，所述方法包括步骤1至步骤4。
步骤1，通过CMS振动监测系统实时监测双馈异步风力发电机轴承的运行状态。
步骤2，当所述发电机轴承的振动频率大于预设的报警阈值时，利用高内阻毫伏表测量所述发电机的轴电压，利用涡流电导率仪测量所述发电机的转轴电导率。
在本公开实施例中，所述步骤2还包括：当所述发电机轴承的振动频率大于预设的报警阈值时，所述CMS振动监测系统发出预警。
在一些实施例中，如图2所示，所述高内阻毫伏表的测量正极通过测量碳刷连接至所述发电机的驱动端转轴表面，所述高内阻毫伏表的测量负极通过接地线缆接地；
其中，所述测量碳刷通过安装支架安装于所述发电机的轴承外盖上，且测量碳刷的个数为N，N为大于等于1的整数。
在本公开实施例中，如图3所示，所述涡流电导率仪在所述发电机停止状态下测量发电机的转轴电导率；
所述高内阻毫伏表在所述发电机并网状态下测量发电机的轴电压。
需要说明的是，所述高内阻毫伏表，将毫伏表测量正极通过测量碳刷连接至发电机驱动端转轴表面，需保证测量碳刷与转轴表面充分接触，接触面积不小于85％；测量碳刷通过安装支架安装于发电机轴承外盖，为提高测量准确性，安装条件允许时可安装多个测量碳刷；毫伏表测量负极通过接地线缆接地，构成轴电压测量回路。发电机转轴的电导率通过涡流电导率仪直接测量，测量仪器及测量方法应符合GB/T 35392-2017的规定。
步骤3，根据所述发电机的轴电压和转轴电导率确定所述发电机转轴的轴电流密度。
在本公开实施例中，所述发电机转轴的轴电流密度的计算式如下：
J＝Uσ/l
式中，J为发电机转轴的轴电流密度，U为发电机的轴电压，σ为发电机的转轴电导率。
需要说明的是，启动风力发电机组，同时测量并记录发电机轴电压U，电流密度时常可以近似为与电场成正比，以方程表达为J＝σE；
其中，E是电场强度，J是电流密度，σ是电导率。
由欧姆定律可知电阻R＝ρL/S；其中,R是电阻,L是物体长度，S是物体的截面面积，ρ是电阻率。根据欧姆定律，电压U等于电流I乘以电阻：U＝IR，所以U＝I*ρL/S。电场与电压的关系为E＝Z*U/L，其中Z是电流方向，所以，E＝Z*ρI/S＝ρJ，电导率为电阻率的倒数，σ＝1/ρ，电流密度与电场的关系为J＝σE，而电压U＝El，所以J＝Uσ/l，其中U为测量得到的发电机轴电压，σ为测量得到的发电机转轴电导率。
步骤4，基于所述述发电机转轴的轴电流密度判断所述发电机是否发生轴承电腐蚀故障。
在本公开实施例中，所述步骤4包括：
当所述发电机转轴的轴电流密度大于预设的轴电流密度阈值时，判定所述发电机发生轴承电腐蚀故障，否则，所述发电机未发生轴承电腐蚀故障。
需要说明的是，由于轴承电腐蚀故障与轴承接触点的电流密度有关，也就是通过轴承的电流除以滚动体与内圈或者外圈滚道的全部接触面积，这与轴承的型号与运行工况有关。而轴承的运行工况受到载荷、工作游隙、润滑油膜的厚度等多个参数影响，很难准确计算。根据目前已掌握的实际工程经验，通过轴承的轴电流密度小于0.1A/mm2时，不会对轴承造成损伤；而当通过轴承的轴电流密度大于1A/mm2时，轴承内容就会出现明显的电势沟痕。
风力发电机轴承与转轴为过盈配合，当发电机转轴通过轴电流密度较大时，意味着发电机轴承也承受着一定的轴电流冲击。所以当发电机轴承振动超过故障报警阈值，且发电机转轴所通过的轴电流密度超过一定阈值时，可判断发电机轴承发生轴电流腐蚀故障。
为了更加清楚地说明本公开实施例的一种双馈异步风力发电机轴承电腐蚀故障检测方法的实现流程，下面以一个具体的方法实施例进行详细说明，如图4所示，包括步骤S1至S5。
步骤S1，通过CMS振动监测系统对发电机轴承运行状态进行监测，当发电机轴承振动超过设定报警阈值时，CMS系统发出预警。
步骤S2，当CMS系统发出针对发电机轴承振动的预警后，在停机转态下使用涡流电导率仪测量发电机转轴电导率。
步骤S3，当CMS系统发出针对发电机轴承振动的预警后，在发电机并网状态下测量发电机轴电压。
步骤S4，对步骤S2、S3测量所得的结果进行分析计算，得到发电机转轴轴电流密度。
步骤S5，当步骤S4计算所得到的的轴电流密度超过设定的阈值时，判定发电机轴承发生轴电流腐蚀故障，对轴承进行更换处理。
综上所述，本实施例提出的一种双馈异步风力发电机轴承电腐蚀故障检测方法，对风力发电机轴承进行振动监测分析，以判断发电机轴承是否存在故障；当发电机轴承存在故障时，通过轴电压及电导率测量并计算得到发电机转轴所通过的轴电流密度；根据发电机转轴所通过的轴电流密度，判断发电机轴承是否存在轴电流腐蚀故障。由此可较为便利的实现风力发电机轴承轴电流腐蚀故障的诊断，便于风电场调整生产运行计划，及时对机组故障隐患进行处理，保障风电机组安全运行。
实施例二
图5为根据本公开一个实施例提供的一种双馈异步风力发电机轴承电腐蚀故障检测系统的结构图，如图5所示，所述系统包括监测模块100、测量模块200、确定模块300、判断模块400。
监测模块100，用于通过CMS振动监测系统实时监测双馈异步风力发电机轴承的运行状态。
测量模块200，用于当所述发电机轴承的振动频率大于预设的报警阈值时，利用高内阻毫伏表测量所述发电机的轴电压，利用涡流电导率仪测量所述发电机的转轴电导率。
确定模块300，用于根据所述发电机的轴电压和转轴电导率确定所述发电机转轴的轴电流密度。
判断模块400，用于基于所述述发电机转轴的轴电流密度判断所述发电机是否发生轴承电腐蚀故障。
在本公开实施例中，如图6所示，所述系统还包括预警模块500。
预警模块500，用于当所述发电机轴承的振动频率大于预设的报警阈值时，所述CMS振动监测系统发出预警。
在一些实施例中，所述高内阻毫伏表的测量正极通过测量碳刷连接至所述发电机的驱动端转轴表面，所述高内阻毫伏表的测量负极通过接地线缆接地。
其中，所述测量碳刷通过安装支架安装于所述发电机的轴承外盖上；
其中，测量碳刷的个数为N，N为大于等于1的整数。
在本公开实施例中，所述涡流电导率仪在所述发电机停止状态下测量发电机的转轴电导率；
所述高内阻毫伏表在所述发电机并网状态下测量发电机的轴电压。
在本公开实施例中，所述发电机转轴的轴电流密度的计算式如下：
J＝Uσ/l
式中，J为发电机转轴的轴电流密度，U为发电机的轴电压，σ为发电机的转轴电导率。
在本公开实施例中，所述判断模块400具体用于：
当所述发电机转轴的轴电流密度大于预设的轴电流密度阈值时，判定所述发电机发生轴承电腐蚀故障，否则，所述发电机未发生轴承电腐蚀故障。
综上所述，本实施例提出的本一种双馈异步风力发电机轴承电腐蚀故障检测系统，可较为便利的实现风力发电机轴承轴电流腐蚀故障的诊断，便于风电场调整生产运行计划，及时对机组故障隐患进行处理，保障风电机组安全运行。
为了实现上述实施例，本公开实施例还提出一种电子设备，包括至少一个处理器；以及与所述至少一个处理器通信连接的存储器；其中，所述存储器存储有可被所述至少一个处理器执行的指令，所述指令被所述至少一个处理器执行，以使所述至少一个处理器能够执行本公开任一实施例所示的双馈异步风力发电机轴承电腐蚀故障检测方法。
为了实现上述实施例，本公开实施例还提出一种存储有计算机指令的非瞬时计算机可读存储介质，其中，计算机指令用于使计算机实现如本公开任一实施例所示的双馈异步风力发电机轴承电腐蚀故障检测方法。
为了实现上述实施例，本公开实施例还提出一种计算机程序，该计算机程序包括计算机程序代码，当该计算机程序代码在计算机上运行时，使得计算机执行本公开任一实施例所示的双馈异步风力发电机轴承电腐蚀故障检测方法。
为了实现上述实施例，本公开还提出一种计算机程序产品，当计算机程序产品中的指令处理器执行时，执行如本公开前述实施例提出的双馈异步风力发电机轴承电腐蚀故障检测方法。
需要说明的是，前述对方法、系统实施例的解释说明也适用于上述实施例的电子设备、计算机可读存储介质、计算机程序产品和计算机程序，此处不再赘述。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本公开的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
流程图中或在此以其他方式描述的任何过程或方法描述可以被理解为，表示包括一个或更多个用于实现定制逻辑功能或过程的步骤的可执行指令的代码的模块、片段或部分，并且本公开的优选实施方式的范围包括另外的实现，其中可以不按所示出或讨论的顺序， 包括根据所涉及的功能按基本同时的方式或按相反的顺序，来执行功能，这应被本公开的实施例所属技术领域的技术人员所理解。
尽管上面已经示出和描述了本公开的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本公开的限制，本领域的普通技术人员在本公开的范围内可以对上述实施例进行变化、修改、替换和变型。
本公开所有实施例均可以单独被执行，也可以与其他实施例相结合被执行，均视为本公开要求的保护范围。

Claims (14)

  1. 一种双馈异步风力发电机轴承电腐蚀故障检测方法，其特征在于，所述方法包括：
    通过CMS振动监测系统实时监测双馈异步风力发电机轴承的运行状态；
    基于所述发电机轴承的振动频率大于预设的报警阈值，利用高内阻毫伏表测量所述发电机的轴电压，利用涡流电导率仪测量所述发电机的转轴电导率；
    根据所述发电机的轴电压和转轴电导率确定所述发电机转轴的轴电流密度；
    基于所述述发电机转轴的轴电流密度判断所述发电机是否发生轴承电腐蚀故障。
  2. 如权利要求1所述的方法，其特征在于，所述方法还包括：基于所述发电机轴承的振动频率大于预设的报警阈值，所述CMS振动监测系统发出预警。
  3. 如权利要求1或2所述的方法，其特征在于，所述高内阻毫伏表的测量正极通过测量碳刷连接至所述发电机的驱动端转轴表面，所述高内阻毫伏表的测量负极通过接地线缆接地。
  4. 如权利要求3所述的方法，其特征在于，所述测量碳刷通过安装支架安装于所述发电机的轴承外盖上；
    其中，测量碳刷的个数为N，N为大于等于1的整数。
  5. 如权利要求1至4中任一项所述的方法，其特征在于，所述涡流电导率仪在所述发电机停止状态下测量发电机的转轴电导率；
    所述高内阻毫伏表在所述发电机并网状态下测量发电机的轴电压。
  6. 如权利要求1至5中任一项所述的方法，其特征在于，所述发电机转轴的轴电流密度的计算式如下：
    J＝Uσ/l
    式中，J为发电机转轴的轴电流密度，U为发电机的轴电压，σ为发电机的转轴电导率。
  7. 如权利要求1至6中任一项所述的方法，其特征在于，所述基于所述述发电机转轴的轴电流密度判断所述发电机是否发生轴承电腐蚀故障，包括：
    基于所述发电机转轴的轴电流密度大于预设的轴电流密度阈值，判定所述发电机发生轴承电腐蚀故障，否则，所述发电机未发生轴承电腐蚀故障。
  8. 一种双馈异步风力发电机轴承电腐蚀故障检测系统，其特征在于，所述系统包括：
    监测模块，用于通过CMS振动监测系统实时监测双馈异步风力发电机轴承的运行状态；
    测量模块，用于基于所述发电机轴承的振动频率大于预设的报警阈值，利用高内阻毫伏表测量所述发电机的轴电压，利用涡流电导率仪测量所述发电机的转轴电导率；
    确定模块，用于根据所述发电机的轴电压和转轴电导率确定所述发电机转轴的轴电流密度；
    判断模块，用于基于所述述发电机转轴的轴电流密度判断所述发电机是否发生轴承电腐蚀故障。
  9. 如权利要求8所述的系统，其特征在于，所述系统还包括：
    预警模块，用于基于所述发电机轴承的振动频率大于预设的报警阈值，所述CMS振动监测系统发出预警。
  10. 如权利要求8或9所述的系统，其特征在于，所述高内阻毫伏表的测量正极通过测量碳刷连接至所述发电机的驱动端转轴表面，所述高内阻毫伏表的测量负极通过接地线缆接地。
  11. 一种存储有计算机指令的非瞬时计算机可读存储介质，其中，所述计算机指令用于使所述计算机执行根据权利要求1至7中任一项所述的方法。
  12. 一种电子设备，包括：
    至少一个处理器；以及
    与所述至少一个处理器通信连接的存储器；其中，
    所述存储器存储有可被所述至少一个处理器执行的指令，所述指令被所述至少一个处理器执行，以使所述至少一个处理器能够执行权利要求1至7中任一项所述的方法。
  13. 一种计算机程序产品，包括计算机程序，所述计算机程序在被处理器执行时实现根据权利要求1至7中任一项所述的方法。
  14. 一种计算机程序，其特征在于，所述计算机程序包括计算机程序代码，当所述计算机程序代码在计算机上运行时，以使得计算机执行如权利要求1至7中任一项所述的方法。
PCT/CN2023/090675 2023-01-16 2023-04-25 一种双馈异步风力发电机轴承电腐蚀故障检测方法及系统 Ceased WO2024152467A1 (zh)

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