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Wind power generation apparatus

A technology for wind power generation devices and generators, which is applied to wind turbine components, wind energy power generation, wind turbines, etc., can solve the problem that it is difficult to reduce torque fluctuations, and achieve the effect of reducing mechanical loads.

Inactive Publication Date: 2013-07-17
SUMITOMO HEAVY IND LTD
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Problems solved by technology

[0006] However, the pitch control has a limit on the speed at which the wind turbine blades can be moved, and it is difficult to alleviate torque fluctuations caused by the wind turbine blades receiving wind (for example, torque fluctuations caused by sudden wind speed changes, or caused by the rotation of wind turbine blades). aerodynamic torque variation caused by

Method used

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Experimental program
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no. 1 Embodiment approach ）

[0035] figure 1 It is a side view of the wind power generator 1 according to the first embodiment. The wind power generator 1 includes a strut 2 erected on a base 6 , a nacelle 3 provided on the upper end of the strut 2 , and a rotor head 4 rotatably assembled with respect to the nacelle 3 . A plurality of (for example, three) windmill blades (also called windmill wings) 5 are installed on the rotor head 4 . The wind power generator 1 is a so-called constant speed wind turbine, and is configured such that after the rotation speed of the wind turbine blades 5 reaches a predetermined rated rotation speed, the wind turbine blades 5 rotate at the rated rotation speed.

[0036] FIGS. 2( a ) and ( b ) are diagrams showing variations in torque generated by wind turbine blade 5 receiving wind. Figure 2(a) is the frequency spectrum of the torque, and Figure 2(b) is the time series data of the torque. By analyzing the torque data represented by FIGS. 2( a ) and ( b ), the present inv...

no. 2 Embodiment approach ）

[0090] In the first embodiment, the case where the wind power generator 1 is a wind turbine operated at a constant speed has been described. The wind power generator according to the second embodiment is a so-called variable-speed operation wind turbine, and is configured such that the rotation speed of the wind turbine blade 5 changes due to wind speed or the like during normal operation.

[0091] Figure 9 It is a graph showing the relationship between the natural vibration frequency of the power transmission system and the rigidity of the torque arm obtained by a simulation test. Such as Figure 9 As shown, the natural vibration frequency of the power transmission system largely depends on the rigidity of the torque arm. Therefore, by changing the rigidity of the torque arm, the natural vibration frequency can be controlled more precisely.

[0092] Figure 10 is an exemplary Campbell diagram for torque in a wind power plant. Figure 10 Especially the picture about the ...

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Abstract

The invention provides a wind power generation apparatus which can reduce mechanical loads of key components caused by variation of torque generated by windmill blades blown by wind. According to the wind power generation, a generator (20) converts the torque generated by windmill blades (5) blown by wind. The wind power generation apparatus has a power transmission system which transmits power to the generator (20) from the windmill blades (5), a first alleviation mechanism which alleviates torque variation generated by wind shear in the torque variation applied to the power transmission system, and a second alleviation mechanism which alleviates torque variation caused by non-wind shear in the torque variation applied to the power transmission system.

Description

technical field [0001] The invention relates to a wind power generating device which converts the torque generated by wind turbine blades into electric power by using a generator. Background technique [0002] Demand for environment-friendly green energy is increasing due to the improvement of environmental awareness in recent years. As one of the energy sources representing such green energy, there is wind power generation. In wind power generation, wind power is converted into torque, and the torque is used to generate power, so the load on the environment is small (for example, refer to Patent Document 1). [0003] A wind power generator is usually installed in a natural environment, and is basically driven by irregular wind energy. Therefore, a large fluctuation of torque is applied to the components of the wind power generator. Such torque fluctuations may shorten the life of components of the wind power generator. [0004] Shock mitigation has therefore been achieve...

Claims

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Application Information

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IPC IPC(8): F03D9/00F03D11/02F03D11/00F03D7/04
CPCY02E10/72
Inventor 冈田真三杉山文乃佐藤泰正
Owner SUMITOMO HEAVY IND LTD
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