A wind power variable pitch system

Abstract

The present application relates to the technical field of wind power generator, particularly relates to a wind power generation variable pitch system. Including: fan monitoring unit, the fan monitoring unit is used for real-time monitoring the vibration data, the inclination data and the rotating speed signal data of the transmission chain and the cabin base of wind turbine generator system;Fault judgment unit, the fault judgment unit is used for judging whether the wind turbine generator system is failure according to vibration data, inclination data and rotating speed signal data;Alarm unit, the alarm unit is used for when the wind turbine generator system is failure, real-time output alarm signal.The present application collects various data of wind turbine generator system through various sensors installed on the unit, carries out auxiliary abnormal diagnosis through fault judgment unit and triggers automatic alarm, discovers hidden danger in the first time, effectively makes equipment manager real-time, accurately grasps the equipment operating state, improves the stability of equipment operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power generators, in particular to a wind power generation variable pitch system. BACKGROUND

[0002] The variable pitch system is an important component of the wind power generator set, which mainly adjusts the included angle between the blades and the wind direction according to the size of the wind speed to realize that the wind wheel has a constant speed of the wind power generator, and at the same time, the aerodynamic principle can make the blade 90° parallel to the wind direction to make the fan aerodynamic stop. Whether the variable pitch system can normally run directly affects the safety and stability of the unit, and plays a crucial role in the safe operation of the unit.

[0003] However, in the prior art, since part of the wind turbine is not equipped with a vibration detection system when it leaves the factory, the destructive wind speed period of the wind farm is long, the impact and damage of the large parts of the wind turbine are large, which can cause great safety hazards to the transmission chain of the wind turbine, and the monitoring of the abnormal working state of each part of the wind turbine and the fault determination are not accurate, which is not conducive to the accurate master of the running state of the wind power generator set, therefore, how to provide a wind power generation variable pitch system is a technical problem that the person skilled in the art needs to solve. SUMMARY

[0004] The purpose of the present application is to provide a wind power generation variable pitch system, which collects various data of the wind power generator set through various sensors installed on the unit, assists in abnormal diagnosis through the fault judgment unit and triggers automatic alarm, discovers hidden troubles in the first time, so that the equipment management personnel can master the equipment operation state in real time and accurately, improve the enterprise equipment management level, achieve pre-prevention, pre-inspection and maintenance, and ensure the safe, reliable and stable operation of production. With the help of intelligent alarm strategy, the running abnormal state of the unit can be discovered in time.

[0005] The present application improves the problem in the prior art that part of the wind turbine is not equipped with a vibration detection system when it leaves the factory, which can cause long destructive wind speed period of the wind farm, large impact and damage of the large parts of the wind turbine, and great safety hazards to the transmission chain of the wind turbine, the present application collects the vibration signals of the transmission chain and the vibration signal collector of the nacelle base through various vibration sensors installed on the unit, triggers automatic alarm through the auxiliary diagnosis function between the system units, so that the equipment management personnel can master the equipment operation state in real time and accurately, and ensure the safe, reliable and stable operation of production.

[0006] The application improves the prior art, which has the problem that the monitoring of abnormal working states generated by each component of the fan and the fault determination are not accurate, which is not conducive to the accurate grasping of the running state of the wind turbine generator set. The application draws time domain waveform graphs, frequency spectrum graphs and trend graphs according to vibration data, inclination data and rotation speed signal data, determines the fault type of the wind turbine generator set according to the drawn graphs, determines different fault levels according to different fault parameters, facilitates data analysis and fault diagnosis, and improves the accuracy of fault determination.

[0007] In order to achieve the above-mentioned purpose, the application provides the following technical scheme:

[0008] A wind power generation variable pitch system comprises:

[0009] A fan monitoring unit is configured to monitor vibration data, inclination data and rotation speed signal data of a transmission chain and a nacelle base of the wind turbine generator set in real time.

[0010] A fault determination unit is configured to determine whether the wind turbine generator set has a fault according to the vibration data, the inclination data and the rotation speed signal data.

[0011] An alarm unit is configured to output an alarm signal in real time when the wind turbine generator set has a fault.

[0012] In some embodiments of the application, the fan monitoring unit is further configured to draw time domain waveform graphs, frequency spectrum graphs and trend graphs according to the vibration data, the inclination data and the rotation speed signal data.

[0013] The fault determination unit is provided with a database, wherein the database is preconfigured with fault time domain waveform graphs, fault frequency spectrum graphs and fault trend graphs corresponding to fault types of the fan, and the fault determination unit is further configured to determine the fault type of the wind turbine generator set according to the time domain waveform graphs, the frequency spectrum graphs and the trend graphs when the wind turbine generator set has a fault.

[0014] In some embodiments of the application, the fault determination unit is provided with a preset vibration data matrix T0 and a preset fault level matrix A, wherein A(A1, A2, A3, A4) is set for the preset fault level matrix A, wherein A1 is a first preset fault level, A2 is a second preset fault level, A3 is a third preset fault level, A4 is a fourth preset fault level, and A1

[0015] For the preset vibration data matrix T0, set T0 (T01, T02, T03, T04), wherein T01 is the first preset vibration data, T02 is the second preset vibration data, T03 is the third preset vibration data, and T04 is the fourth preset vibration data, and T01 < T02 < T03 < T04;

[0016] The fault judging unit is configured to select a corresponding fault level as the alarm signal output by the alarm unit in real time according to the relationship between the vibration data P and the preset vibration data matrix T0;

[0017] When P < T01, the first preset fault level A1 is selected as the alarm signal output by the alarm unit in real time;

[0018] When T01 ≤ P < T02, the second preset fault level A2 is selected as the alarm signal output by the alarm unit in real time;

[0019] When T02 ≤ P < T03, the third preset fault level A3 is selected as the alarm signal output by the alarm unit in real time;

[0020] When T03 ≤ P < T04, the fourth preset fault level A4 is selected as the alarm signal output by the alarm unit in real time.

[0021] In some embodiments of the present application, a preset inclination data matrix Y0 is further set in the fault judging unit, set Y0 (Y01, Y02, Y03, Y04), wherein Y01 is the first preset inclination data, Y02 is the second preset inclination data, Y03 is the third preset inclination data, and Y04 is the fourth preset inclination data, and Y01 < Y02 < Y03 < Y04;

[0022] The fault judging unit is configured to select a corresponding fault level as the alarm signal output by the alarm unit in real time according to the relationship between the inclination data Q and the preset inclination data matrix Y0;

[0023] When Q < Y01, the first preset fault level B1 is selected as the alarm signal output by the alarm unit in real time;

[0024] When Y01 ≤ Q < Y02, the second preset fault level B2 is selected as the alarm signal output by the alarm unit in real time;

[0025] When Y02 ≤ Q < Y03, the third preset fault level B3 is selected as the alarm signal output by the alarm unit in real time;

[0026] When Y03 ≤ Q < Y04, the fourth preset fault level B4 is selected as the alarm signal output by the alarm unit in real time.

[0027] In some embodiments of the present application, a preset rotating speed signal data matrix I0 is further set in the fault judging unit, I0 (I01, I02, I03, I04) is set, wherein I01 is a first preset rotating speed signal data, I02 is a second preset rotating speed signal data, I03 is a third preset rotating speed signal data, and I04 is a fourth preset rotating speed signal data, and I01

[0028] The fault judging unit is used to select a corresponding fault level as an alarm signal output by the alarm unit in real time according to the relationship between the rotating speed signal data W and the preset rotating speed signal data matrix I0;

[0029] When W

[0030] When I01

[0031] When I02

[0032] When I03

[0033] In some embodiments of the present application, further comprising:

[0034] A central display unit is used to display the vibration data, the inclination data and the rotating speed signal data of the transmission chain and the nacelle base of the wind turbine in real time;

[0035] A man-machine interface is arranged in the central display unit, and the man-machine interface is used to display the alarm signal and the fault type.

[0036] In some embodiments of the present application, further comprising:

[0037] A remote data terminal is wirelessly connected with the wind turbine monitoring unit and the fault judging unit, and the remote data terminal is used to remotely acquire the vibration data, the inclination data and the rotating speed signal data of the transmission chain and the nacelle base of the wind turbine and acquire whether the wind turbine has a fault.

[0038] In some embodiments of the present application, the wind turbine monitoring unit and the fault judging unit support data transmission to the remote data terminal through a standard MODBUS TCP / IP or a standard IEC104 communication protocol.

[0039] In some embodiments of the present application, further comprising:

[0040] A fan bearing database is arranged with bearing databases of a plurality of bearings in the wind turbine generator, the fan bearing database is used to automatically generate a transmission system diagram according to the wind turbine generator, and the fan bearing database is also used to automatically calculate gear meshing frequencies of the bearings of the wind turbine generator according to the transmission system diagram, and the gear meshing frequencies of the bearings are output in a WORD format.

[0041] In some embodiments of the present application, the fan monitoring unit comprises a low-frequency vibration acceleration sensor, a wide-frequency vibration acceleration sensor, a rotating speed sensor, an inclination sensor and a dual-axis low-frequency acceleration sensor.

[0042] The wind power variable pitch system has the beneficial effects that:

[0043] The present application collects and uploads vibration signals of a transmission chain and a nacelle base through various vibration sensors installed on the unit, determines an abnormal working state through an auxiliary diagnosis function and triggers automatic alarm to find hidden dangers at the first time, and timely informs the on-site and remote control center through wireless transmission, so that the equipment managers can master the equipment operation state in real time and accurately, improve the enterprise equipment management level, realize the pre-prevention and pre-inspection, and ensure the safe, reliable and stable operation of production. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 It is a structural block diagram of the wind power variable pitch system in the embodiments of the present application. DETAILED DESCRIPTION

[0045] The specific embodiments of the present application will be further described in detail below in combination with the drawings and embodiments. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0046] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0047] The terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an indicated number of technical features. Thus, features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0048] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In the prior art, since part of the fan is not equipped with a vibration detection system when it leaves the factory, the destructive wind speed period of the wind farm is long, the impact and damage of the fan main parts are large, which can cause great safety hazards to the fan transmission chain, and the monitoring of the abnormal working state of each part of the fan and the fault determination are not accurate, which is not conducive to the accurate master of the running state of the wind turbine generator set and other problems.

[0050] Therefore, the present application provides a wind power variable pitch system, which collects various data of the wind turbine generator set through various sensors installed on the unit, performs auxiliary abnormal diagnosis through a fault judgment unit and triggers automatic alarm, discovers hidden troubles in the first time, enables equipment managers to master the equipment running state in real time and accurately, improves the enterprise equipment management level, realizes pre-prevention, pre-inspection and maintenance, and ensures the safe, reliable and stable operation of production. With the help of intelligent alarm strategy, the running abnormal state of the unit can be discovered in time.

[0051] Referring to Figure 1 The disclosed embodiments of the present application provide a wind power variable pitch system, which comprises:

[0052] A fan monitoring unit is used to monitor the vibration data, the inclination data and the rotating speed signal data of the transmission chain and the nacelle base of the wind turbine generator set in real time.

[0053] A fault judgment unit is used to judge whether the wind turbine generator set has a fault according to the vibration data, the inclination data and the rotating speed signal data.

[0054] An alarm unit is used to output an alarm signal in real time when the wind turbine generator set has a fault.

[0055] In an embodiment of the present application, the fan monitoring unit is further configured to draw time-domain waveform graphs, frequency spectrum graphs and trend graphs according to the vibration data, the inclination data and the rotating speed signal data;

[0056] The fault judging unit is provided with a database, in which are preset fault time-domain waveform graphs, fault frequency spectrum graphs and fault trend graphs corresponding to the fan fault types, and the fault judging unit is further configured to judge the fault type of the wind turbine generator set according to the time-domain waveform graphs, the frequency spectrum graphs and the trend graphs when the wind turbine generator set is in fault.

[0057] In an embodiment of the present application, the fault judging unit is provided with a preset vibration data matrix T0 and a preset fault level matrix A, and for the preset fault level matrix A, A (A1, A2, A3, A4) is set, wherein A1 is a first preset fault level, A2 is a second preset fault level, A3 is a third preset fault level, and A4 is a fourth preset fault level, and A1

[0058] For the preset vibration data matrix T0, T0 (T01, T02, T03, T04) is set, wherein T01 is a first preset vibration data, T02 is a second preset vibration data, T03 is a third preset vibration data, and T04 is a fourth preset vibration data, and T01

[0059] The fault judging unit is configured to select a corresponding fault level as an alarm signal output by the alarm unit in real time according to the relationship between the vibration data P and the preset vibration data matrix T0;

[0060] When P

[0061] When T01≤P

[0062] When T02≤P

[0063] When T03≤P

[0064] In an embodiment of the present application, the fault judging unit is further provided with a preset inclination data matrix Y0, and Y0 (Y01, Y02, Y03, Y04) is set, wherein Y01 is a first preset inclination data, Y02 is a second preset inclination data, Y03 is a third preset inclination data, and Y04 is a fourth preset inclination data, and Y01

[0065] The fault judging unit is configured to select a corresponding fault level as an alarm signal output by the alarm unit in real time according to a relationship between the inclination data Q and the preset inclination data matrix Y0;

[0066] When Q < Y01, a first preset fault level B1 is selected as the alarm signal output by the alarm unit in real time;

[0067] When Y01≤Q < Y02, a second preset fault level B2 is selected as the alarm signal output by the alarm unit in real time;

[0068] When Y02≤Q < Y03, a third preset fault level B3 is selected as the alarm signal output by the alarm unit in real time;

[0069] When Y03≤Q < Y04, a fourth preset fault level B4 is selected as the alarm signal output by the alarm unit in real time.

[0070] In an embodiment of the present application, the fault judging unit is further provided with a preset rotating speed signal data matrix I0, which is set as I0 (I01, I02, I03, I04), wherein I01 is a first preset rotating speed signal data, I02 is a second preset rotating speed signal data, I03 is a third preset rotating speed signal data, and I04 is a fourth preset rotating speed signal data, and I01 < I02 < I03 < I04;

[0071] The fault judging unit is configured to select a corresponding fault level as an alarm signal output by the alarm unit in real time according to a relationship between the rotating speed signal data W and the preset rotating speed signal data matrix I0;

[0072] When W < I01, a fourth preset fault level C4 is selected as the alarm signal output by the alarm unit in real time;

[0073] When I01≤W < I02, a third preset fault level C3 is selected as the alarm signal output by the alarm unit in real time;

[0074] When I02≤W < I03, a second preset fault level C2 is selected as the alarm signal output by the alarm unit in real time;

[0075] When I03≤W < I04, a first preset fault level C1 is selected as the alarm signal output by the alarm unit in real time.

[0076] In an embodiment of the present application, the fault judging unit is further provided with a preset rotating speed signal data matrix I0, which is set as I0 (I01, I02, I03, I04), wherein I01 is a first preset rotating speed signal data, I02 is a second preset rotating speed signal data, I03 is a third preset rotating speed signal data, and I04 is a fourth preset rotating speed signal data, and I01 < I02 < I03 < I04;

[0077] The central display unit is configured to display vibration data, inclination data and rotating speed signal data of the transmission chain and the nacelle base of the wind turbine in real time;

[0078] The central display unit is provided with a man-machine interaction interface, and the man-machine interaction interface is used for displaying an alarm signal and a fault type.

[0079] In one specific embodiment of the present application, the system further comprises:

[0080] The remote data terminal is wirelessly connected with the fan monitoring unit and the fault judging unit, and is used for remotely acquiring vibration data, inclination data and rotating speed signal data of the transmission chain and the nacelle base of the wind turbine generator and acquiring whether the wind turbine generator has a fault.

[0081] In one specific embodiment of the present application, the fan monitoring unit and the fault judging unit support data transmission to the remote data terminal through a standard MODBUS TCP / IP or a standard IEC104 communication protocol.

[0082] In one specific embodiment of the present application, the system further comprises:

[0083] The fan bearing database is provided with a bearing database of a plurality of bearings in the wind turbine generator, and is used for automatically generating a transmission system diagram according to the wind turbine generator, and automatically calculating gear meshing frequencies of the bearings of the wind turbine generator according to the transmission system diagram, and outputting the gear meshing frequencies of the bearings in a WORD format.

[0084] In one specific embodiment of the present application, the fan monitoring unit comprises a low-frequency vibration acceleration sensor, a general-frequency vibration acceleration sensor, a rotating speed sensor, an inclination sensor and a double-shaft low-frequency acceleration sensor.

[0085] According to the first technical concept of the present application, the vibration signals of the transmission chain and the nacelle base are collected by various vibration sensors installed on the unit, and automatic alarm is triggered through the auxiliary diagnosis function between the system units, so that the equipment managers can master the equipment operation state in real time and accurately, and the safe, reliable and stable operation of production is ensured.

[0086] According to the second technical concept of the present application, time-domain waveform graphs, frequency spectrum graphs and trend graphs are drawn according to the vibration data, the inclination data and the rotating speed signal data, the fault type of the wind turbine generator is judged according to the drawn graphs, different fault levels are determined according to different fault parameters, data analysis and fault diagnosis are facilitated, and the accuracy of fault determination is improved.

[0087] In summary, the wind turbine condition monitoring system is through various sensing elements online monitoring the vibration, inclination, rotating speed signal of the transmission chain, nacelle base and other key components of the wind turbine, analyzing and diagnosing the health status of each component of the wind turbine, identifying the fault type, fault degree and accurately positioning the fault component, predicting failure, the system of the application can monitor the running state of the transmission chain, nacelle base and other important components of the wind turbine, can find the early signs of failure, and make accurate judgment and conclusion on the fault component, fault type, severity and development trend, can optimize the maintenance work of the user, reduce unexpected downtime and reduce unpredictable cost.

[0088] The above description is only one embodiment of the application, but cannot limit the scope of the application, any structural changes made according to the application, as long as the essence of the application is not lost, should be considered to fall within the scope of the application.

[0089] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process and related description of the system described above can refer to the corresponding process in the foregoing method embodiments, which will not be described here.

[0090] It should be noted that the system provided by the above embodiments is only exemplified by the division of the above functional modules, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the modules or steps in the embodiments of the application are further decomposed or combined, for example, the modules of the above embodiments can be combined into one module, or can be further split into multiple sub-modules to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the application are only for distinguishing the modules and steps, and should not be considered as an improper limitation of the application.

[0091] Those skilled in the art should be aware that the modules, method steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware, computer software or combination of the two. The programs corresponding to the software modules and method steps can be placed in random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, register, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. In order to clearly illustrate the interchangeability of electronic hardware and software, the composition and steps of each example have been described generally in the above description. Whether the functions are executed by electronic hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the application.

[0092] The term "comprising" or any other similar word is intended to encompass the inclusion of one or more steps, features, or elements but not to the exclusion of any other steps, features, or elements. The term "comprising" therefore indicates that the inclusion of one or more steps, features, or elements is not a limitation on other steps, features, or elements that can be included.

[0093] The technical solutions of the present application have been described above in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after these changes or replacements will all fall within the protection scope of the present application.

[0094] The above description is only for the preferred embodiments of the present application and is not intended to limit the protection scope of the present application.

Claims

1. A wind power variable pitch system, characterized in that, The wind turbine monitoring system comprises: a wind turbine monitoring unit for monitoring vibration data, inclination data and rotation speed signal data of a drive chain and a nacelle base of a wind turbine in real time; a fault judging unit for judging whether the wind turbine has a fault according to the vibration data, the inclination data and the rotation speed signal data; an alarm unit for outputting an alarm signal in real time when the wind turbine has a fault; the wind turbine monitoring unit is further configured to draw a time-domain waveform diagram, a frequency spectrum diagram and a trend diagram according to the vibration data, the inclination data and the rotation speed signal data; the fault judging unit is provided with a database, the database is pre-stored with fault time-domain waveform diagrams, fault frequency spectrum diagrams and fault trend diagrams corresponding to fault types of the wind turbine, and the fault judging unit is further configured to judge a fault type of the wind turbine according to the time-domain waveform diagram, the frequency spectrum diagram and the trend diagram when the wind turbine has a fault; the fault judging unit is provided with a preset vibration data matrix T0 and a preset fault level matrix A, for the preset fault level matrix A, A(A1, A2, A3, A4) is set, wherein A1 is a first preset fault level, A2 is a second preset fault level, A3 is a third preset fault level, and A4 is a fourth preset fault level, and A1 for the preset vibration data matrix T0, T0(T01, T02, T03, T04) is set, wherein T01 is a first preset vibration data, T02 is a second preset vibration data, T03 is a third preset vibration data, and T04 is a fourth preset vibration data, and T01 the fault judging unit is configured to select a corresponding fault level as the alarm signal output by the alarm unit in real time according to a relationship between vibration data P and the preset vibration data matrix T0; when P when T01≤P when T02≤P when T03≤P when T03≤P 2. The wind power variable pitch system according to claim 1, wherein the fault judging unit is further provided with a preset inclination data matrix Y0, Y0(Y01, Y02, Y03, Y04) is set, wherein Y01 is a first preset inclination data, Y02 is a second preset inclination data, Y03 is a third preset inclination data, and Y04 is a fourth preset inclination data, and Y01 the fault judging unit is configured to select a corresponding fault level as the alarm signal output by the alarm unit in real time according to a relationship between inclination data Q and the preset inclination data matrix Y0; When Q < Y01, the first preset fault level B1 is selected as the alarm signal output by the alarm unit in real time; When Y01≤Q < Y02, the second preset fault level B2 is selected as the alarm signal output by the alarm unit in real time; When Y02≤Q < Y03, the third preset fault level B3 is selected as the alarm signal output by the alarm unit in real time; When Y03≤Q < Y04, the fourth preset fault level B4 is selected as the alarm signal output by the alarm unit in real time.

3. The wind power generation variable pitch system according to claim 2, wherein, a preset rotating speed signal data matrix I0 is further set in the fault judging unit, and I0 (I01, I02, I03, I04) is set, wherein I01 is a first preset rotating speed signal data, I02 is a second preset rotating speed signal data, I03 is a third preset rotating speed signal data, and I04 is a fourth preset rotating speed signal data, and I01 < I02 < I03 < I04; the fault judging unit is used to select a corresponding fault level as the alarm signal output by the alarm unit in real time according to the relationship between the rotating speed signal data W and the preset rotating speed signal data matrix I0; When W < I01, the fourth preset fault level C4 is selected as the alarm signal output by the alarm unit in real time; When I01≤W < I02, the third preset fault level C3 is selected as the alarm signal output by the alarm unit in real time; When I02≤W < I03, the second preset fault level C2 is selected as the alarm signal output by the alarm unit in real time; When I03≤W < I04, the first preset fault level C1 is selected as the alarm signal output by the alarm unit in real time.

4. The wind power variable pitch system of claim 1, wherein, Further comprising: a central display unit, which is used to display the vibration data, the inclination data and the rotating speed signal data of the transmission chain and the nacelle base of the wind turbine in real time; a man-machine interface is arranged in the central display unit, and the man-machine interface is used to display the alarm signal and the fault type.

5. The wind power variable pitch system of claim 1, wherein, Further comprising: a remote data terminal, which is wirelessly connected with the wind turbine monitoring unit and the fault judging unit, and is used to remotely acquire the vibration data, the inclination data and the rotating speed signal data of the transmission chain and the nacelle base of the wind turbine and acquire whether the wind turbine has a fault.

6. The wind power generation variable pitch system according to claim 5, wherein, the wind turbine monitoring unit and the fault judging unit support data transmission to the remote data terminal through a standard MODBUS TCP / IP or a standard IEC104 communication protocol.

7. The wind power variable pitch system of claim 1, wherein, Further comprising: The fan bearing database is arranged with bearing databases of several bearings in the wind turbine generator, and is used to automatically generate a transmission system diagram of the wind turbine generator, and is also used to automatically calculate gear meshing frequencies of the bearings of the wind turbine generator according to the transmission system diagram, and output the gear meshing frequencies of the bearings in WORD format.

8. The wind power generation variable-pitch system according to claim 1, characterized in that, The fan monitoring unit comprises a low-frequency vibration acceleration sensor, a pass-frequency vibration acceleration sensor, a rotating speed sensor, an inclination sensor and a double-shaft low-frequency acceleration sensor.

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