A wind turbine generator set drive shaft torsional vibration protection device and method

Abstract

The present application relates to the technical field of wind turbine, and discloses a wind turbine transmission shaft torsional vibration protection device and method, the protection device, including transmission shaft system, the measuring device installed at the front end of the transmission shaft system and the rear end of the transmission shaft system, the measuring device includes zero position pulse detector, the zero position pulse detector is used to measure the zero position pulse time of the front end of the transmission shaft system or the zero position pulse time of the rear end of the transmission shaft system.The present application solves the problems of the prior art, such as the transmission shaft system is easy to twist and vibrate, and the operation safety of the unit is seriously affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind turbine generator system, in particular to a wind turbine generator system transmission shaft torsional vibration protection device and method. BACKGROUND

[0002] With the development of wind power technology and market demand, the capacity of wind turbine generator system is getting larger and larger, and the blade is getting longer and longer. In addition, domestic wind power begins to be on-grid at a flat price. In order to reduce the cost of the unit and respond to the challenge of wind power on-grid at a flat price, through optimization design, the weight and stiffness of the blade are continuously reduced, resulting in larger deformation of the blade. At the same time, in order to respond to the price rise of copper, rare earth and other raw materials, wind turbine generator system uses double-fed or half-direct-driven transmission structure with longer transmission shaft system. The large deformation of the blade and the longer transmission shaft system can easily cause torsional vibration of the transmission shaft system, which seriously affects the safe operation of the unit. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the present application provides a wind turbine generator system transmission shaft torsional vibration protection device and method, which solves the problems of the prior art that the transmission shaft system is easy to torsional vibration and seriously affects the safe operation of the unit.

[0004] The technical scheme adopted by the present application to solve the above problems is:

[0005] A wind turbine generator system transmission shaft torsional vibration protection device, comprising a transmission shaft system, a measuring device installed at the front end of the transmission shaft system and the rear end of the transmission shaft system, the measuring device comprising a zero pulse detector, the zero pulse detector being used to measure the zero pulse time at the front end of the transmission shaft system or the zero pulse time at the rear end of the transmission shaft system.

[0006] As a preferred technical scheme, the transmission shaft system comprises a gear box, a main shaft connected to the front end of the gear box, and a coupling connected to the rear end of the gear box, and the zero pulse detector is installed on the main shaft and the coupling respectively.

[0007] As a preferred technical scheme, the transmission shaft system comprises a wind wheel connected to the end of the main shaft away from the gear box, and a generator connected to the end of the coupling away from the gear box.

[0008] As a preferred technical scheme, the measuring device further comprises a speed sensor, the speed sensor being used to measure the speed at the front end of the transmission shaft system or the speed at the rear end of the transmission shaft system.

[0009] A wind turbine generator system transmission shaft torsional vibration protection method, using the wind turbine generator system transmission shaft torsional vibration protection device, comprising the following steps:

[0010] S1, acquiring the rotational speeds ω1 and ω2 of the two ends of the transmission shaft system by using a rotational speed sensor, and acquiring the zero position time T1 and T2 of each rotation of the two ends of the transmission shaft system by using a zero position pulse detector; wherein ω1 is the rotational speed of the front end of the transmission shaft system, ω2 is the rotational speed of the rear end of the transmission shaft system, T1 is the zero position pulse time of the front end of the transmission shaft system, and T2 is the zero position pulse time of the rear end of the transmission shaft system;

[0011] S2, calculating the input torque of the entire transmission shaft system according to the rotational speeds ω1 and ω2 of the two ends of the transmission shaft system, and the calculation formula is:

[0012]

[0013] wherein Q in is the input torque of the transmission shaft system, and J is the equivalent rotational inertia of the transmission shaft system;

[0014] and;

[0015] calculating the relative torsion angle of the front end and the rear end of the transmission shaft according to the zero position time T1 and T2 of each rotation of the two ends of the transmission shaft system, and the calculation formula is:

[0016] ΔT=T2-T1 (2),

[0017] Δψ=ΔT×ω2 (3);

[0018] wherein ΔT is the zero position pulse time difference between the front end of the transmission shaft system and the rear end of the transmission shaft system, and Δψ is the relative torsion angle between the front end of the transmission shaft system and the rear end of the transmission shaft system;

[0019] S3, setting the maximum allowable input torque of the transmission shaft system as Q max and the maximum allowable relative torsion angle of the transmission shaft system as ψ max , and setting the protection logic of the wind turbine generator system for power reduction operation or shutdown.

[0020] As a preferred technical solution, in step S3, it is set that: if Q in >f1×Q max , the wind turbine generator system is operated in power reduction mode; wherein the range of f1 is [0.8, 1.1].

[0021] As a preferred technical solution, in step S3, it is set that: if Δψ>f1×ψ max , the wind turbine generator system is operated in power reduction mode.

[0022] As a preferred technical solution, in step S3, it is set that: if Q in >f2×Q max , the wind turbine generator system is shut down; wherein the range of f2 is [0.9, 1.2].

[0023] As a preferred technical solution, in step S3, it is set that: if Δψ>f2×ψ max When this happens, the wind turbine generators will shut down.

[0024] As a preferred technical solution, f1 is 0.8 and f2 is 0.9.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] (1) The present invention solves the problems of easy torsional vibration of the transmission shaft system and serious impact on the safe operation of the unit in the prior art;

[0027] (2) The present invention can detect whether the transmission shaft system is torsional vibration in real time, protect the safe operation of the unit, thereby reducing the design cost, and the technical solution is easy to apply in engineering.

[0028] (3) This invention directly measures the rotational speed and zero-position phase difference between the front and rear ends of the transmission shaft system, and can directly and accurately obtain torsional vibration information. It is easy to implement, low in cost, and easy to promote and apply in batches.

[0029] (4) The protection parameters of this invention are set directly based on design constraints, with clear and explicit physical meaning, avoiding repeated debugging and testing, and are applicable to different models. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a torsional vibration protection device for the drive shaft of a wind turbine generator set according to the present invention;

[0031] Figure 2 This is a schematic diagram of the installation of the zero-position pulse detection device of the present invention;

[0032] Figure 3 This is a schematic diagram illustrating the time difference calculation of the present invention;

[0033] Figure 4 This is a control flowchart of an embodiment of a wind turbine generator drive shaft torsional vibration protection method according to the present invention.

[0034] The attached diagram shows the following components and their corresponding names: 1. Measuring device, 2. Gearbox, 3. Main shaft, 4. Coupling, 5. Wind turbine, 6. Generator. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0036] Example 1

[0037] like Figures 1 to 4As shown, a torsional vibration protection device for a wind turbine generator drive shaft includes a drive shaft system and a measuring device 1 installed at the front end and rear end of the drive shaft system. The measuring device 1 includes a zero-position pulse detector, which is used to measure the zero-position pulse time at the front end or the zero-position pulse time at the rear end of the drive shaft system.

[0038] As a preferred technical solution, the transmission shaft system includes a gearbox 2, a main shaft 3 connected to the front end of the gearbox 2, and a coupling 4 connected to the rear end of the gearbox 2. The zero-position pulse detector is respectively installed on the main shaft 3 and the coupling 4.

[0039] As a preferred technical solution, the transmission shaft system includes a wind turbine 5 connected to the end of the main shaft 3 away from the gearbox 2, and a generator 6 connected to the end of the coupling 4 away from the gearbox 2.

[0040] As a preferred technical solution, the measuring device 1 further includes a speed sensor, which is used to measure the speed at the front end of the transmission shaft or the speed at the rear end of the transmission shaft.

[0041] A method for protecting the torsional vibration of a wind turbine generator drive shaft, utilizing the aforementioned wind turbine generator drive shaft torsional vibration protection device, includes the following steps:

[0042] S1, using a speed sensor to obtain the speeds ω1 and ω2 at both ends of the transmission shaft system; and using a zero-position pulse detector to obtain the zero-position time T1 and T2 for each revolution of the transmission shaft system; where ω1 is the speed at the front end of the transmission shaft system, ω2 is the speed at the rear end of the transmission shaft system, T1 is the time of the zero-position pulse at the front end of the transmission shaft system, and T2 is the time of the zero-position pulse at the rear end of the transmission shaft system.

[0043] S2, based on the rotational speeds ω1 and ω2 at both ends of the transmission shaft system, calculate the input torque of the entire transmission shaft system. The calculation formula is as follows:

[0044]

[0045] Among them, Q in Let J be the input torque of the transmission shaft system, and J be the equivalent moment of inertia of the transmission shaft system.

[0046] as well as;

[0047] Based on the zero-position times T1 and T2 of each revolution at both ends of the drive shaft system, calculate the relative torsional angle between the front and rear ends of the drive shaft. The calculation formula is as follows:

[0048] ΔT=T2-T1 (2),

[0049] Δψ=ΔT×ω2 (3);

[0050] Where ΔT is the zero-position pulse time difference between the front end and the rear end of the transmission shaft system, and Δψ is the relative torsional angle between the front end and the rear end of the transmission shaft system.

[0051] S3, set the maximum allowable input torque of the transmission shaft system to Q. max The maximum permissible relative torsional angle of the transmission shaft system is ψ. max Configure protection logic to control the wind turbine generator to operate at reduced power or shut down.

[0052] As a preferred technical solution, in step S3, it is set that: if Q in >f1×Q max If the wind turbine generator operates at reduced power, the range of f1 is [0.8, 1.1].

[0053] As a preferred technical solution, in step S3, it is set that: if Δψ>f1×ψ max If so, the wind turbine generator will operate at reduced power.

[0054] As a preferred technical solution, in step S3, it is set that: if Q in >f2×Q max If the wind turbine generator stops, the range of f2 is [0.9, 1.2].

[0055] As a preferred technical solution, in step S3, it is set that: if Δψ>f2×ψ max When this happens, the wind turbine generators will shut down.

[0056] As a preferred technical solution, f1 is 0.8 and f2 is 0.9.

[0057] Through the technical solution of Embodiment 1, this invention solves the problems of easy torsional vibration of the transmission shaft system and serious impact on the operational safety of the unit in the prior art; this invention can detect whether the transmission shaft is torsional, protect the operational safety of the unit, and reduce design costs, and this technical solution is easy to apply in engineering; this invention directly measures the rotational speed and zero-position phase difference of the front and rear ends of the transmission shaft system, and can directly and accurately obtain torsional vibration information, which is easy to implement, low in cost, and easy to promote and apply in batches; the protection parameters of this invention are set directly according to the design constraints, with clear and explicit physical meaning, avoiding repeated debugging and testing, and are applicable to different models.

[0058] Example 2

[0059] like Figures 1 to 4 As shown, as a further optimization of Embodiment 1, this embodiment includes all the technical features of Embodiment 1. In addition, this embodiment also includes the following technical features:

[0060] This invention proposes a method for protecting the torsional vibration of the drive shaft of a wind turbine generator set, which can detect the torsional vibration of the drive shaft in real time and protect the safe operation of the generator set.

[0061] When using it, follow these steps:

[0062] The first step is to install speed sensors at the front and rear ends of the drive shaft system to obtain the speeds ω1 and ω2 at both ends of the drive shaft system, where ω1 is the speed at the front end of the drive shaft system and ω2 is the speed at the rear end of the drive shaft system.

[0063] The second step is to install zero-position pulse detectors at the front and rear ends of the transmission shaft system to obtain the zero-position time T1 and T2 of each revolution of the transmission shaft system, where T1 is the time when the zero-position pulse is detected at the front end of the transmission shaft system and T2 is the time when the zero-position pulse is detected at the rear end of the transmission shaft system.

[0064] The third step is to calculate the inertial torque based on the rotational speeds at both ends of the transmission shaft system, thus obtaining the input torque of the entire transmission shaft system:

[0065]

[0066] Among them: Q in J is the input torque of the transmission shaft system, and J is the equivalent moment of inertia of the transmission shaft system.

[0067] Fourth step, order

[0068] ΔT=T2-T1 (2);

[0069] Where: ΔT is the zero-position pulse time difference between the front and rear ends of the transmission shaft system. The time difference is calculated using high-frequency counting pulses, counting the number of counting pulses between two zero-position pulses. See Appendix. Figure 2 ;

[0070] Again

[0071] Δψ=ΔT×ω2 (3);

[0072] Then Δψ is the relative torsional angle between the front and rear ends of the transmission shaft system;

[0073] Fifth, the maximum permissible input torque of the drive shaft system is Q. max The maximum permissible relative torsional angle between the front and rear ends of the drive shaft system is ψ. max Therefore, the following protection logic is designed:

[0074] 1. When the input torque Q of the transmission shaft system in >f1×Q max Or Δψ>f1×ψ max When necessary, reduce power operation;

[0075] 2. When the input torque Q of the transmission shaft system in >f2×Q max Or Δψ>f2×ψ max In such cases, a rapid shutdown should be initiated.

[0076] Typically, f1 is set to 0.8 and f2 to 0.9, but these values ​​can be adjusted based on the actual operating conditions on site.

[0077] The beneficial technical effects of this application are:

[0078] It can detect whether torsional vibration occurs in the transmission shaft system in real time, protect the safe operation of the unit, thereby reducing design costs, and this technical solution is easy to apply in engineering.

[0079] As described above, the present invention can be implemented well.

[0080] All features disclosed in all embodiments of this specification, or steps in all methods or processes implied in the disclosure, may be combined and / or extended or replaced in any way, except for mutually exclusive features and / or steps.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Based on the technical essence of the present invention, any simple modifications, equivalent substitutions, and improvements made to the above embodiments within the spirit and principles of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for protecting the torsional vibration of a wind turbine generator drive shaft, characterized in that, A torsional vibration protection device for a wind turbine generator drive shaft is provided. The device includes a drive shaft system and a measuring device (1) installed at the front end and the rear end of the drive shaft system. The measuring device (1) includes a zero-position pulse detector, which is used to measure the zero-position pulse time at the front end and the zero-position pulse time at the rear end of the drive shaft system. This method Includes the following steps: S1, using a speed sensor to obtain the speed at both ends of the transmission shaft system. and And; using a zero-position pulse detector to obtain the zero-position time per revolution at both ends of the transmission shaft system. and ;in, It is the rotational speed of the front end of the drive shaft system. It refers to the rotational speed at the rear end of the drive shaft system. It is the time of the zero-position pulse at the front end of the drive shaft system. It is the time of the zero-position pulse at the rear end of the drive shaft system; S2, based on the rotational speed at both ends of the transmission shaft system. and The input torque of the entire transmission shaft system is calculated using the following formula: （1）； in, This refers to the input torque of the transmission shaft system. This is the equivalent moment of inertia of the transmission shaft system; as well as; Based on the zero-position time of each revolution at both ends of the transmission shaft system and Calculate the relative torsional angle between the front and rear ends of the drive shaft using the following formula: （2）， （3）； in, This represents the zero-position pulse time difference between the front and rear ends of the drive shaft system. The relative torsional angle between the front end and the rear end of the drive shaft system; S3 sets the maximum permissible input torque of the drive shaft system to... and the maximum permissible relative torsional angle of the transmission shaft system is Set up protection logic to control the wind turbine generator to operate at reduced power or shut down; in step S3, set: if Then the wind turbine generator will operate at reduced power; where; if Then the wind turbine generator will operate at reduced power; setting: if If the wind turbine generator stops, then the wind turbine generator will shut down; if When this happens, the wind turbine generators will shut down; It is 0.

8. It is 0.

9.

2. The method for torsional vibration protection of a wind turbine generator drive shaft according to claim 1, characterized in that, The transmission shaft system includes a gearbox (2), a main shaft (3) connected to the front end of the gearbox (2), and a coupling (4) connected to the rear end of the gearbox (2). The zero-position pulse detector is installed on the main shaft (3) and the coupling (4) respectively.

3. The method for torsional vibration protection of the drive shaft of a wind turbine generator set according to claim 2, characterized in that, The transmission shaft system includes a wind turbine (5) connected to the end of the main shaft (3) away from the gearbox (2) and a generator (6) connected to the end of the coupling (4) away from the gearbox (2).

4. A method for protecting the torsional vibration of a wind turbine generator drive shaft according to any one of claims 1 to 3, characterized in that, The measuring device (1) further includes a speed sensor, which is used to measure the speed at the front end of the transmission shaft and the speed at the rear end of the transmission shaft.

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