| In the coastal area of Southeast China typhoon prone natural conditions, the control of small wind turbine requirements put forward higher requirements. Due to the fickleness of natural wind conditions, under the condition of the wind speed violent or dramatic changes in wind direction, the traditional control mode is extremely easy to lead to a small wind turbine blade is damaged, or the rotor speed is too high, resulting in wind turbine burned. In view of the existing technology in response to the typhoon and other extreme weather defects and deficiencies, this topic will refer to the relevant standards to develop a safe, efficient new wind turbine has the control function of the umbrella.Umbrella mechanism is a complicated control mechanism, involving many aspects of theoretical knowledge. This paper design as an example of 5 k W umbrella mechanism,introduced the umbrella structure calculation of adjusting mechanism and system building,the late umbrella adjusting mechanism reliability and control performance of the bench test and wind tunnel test.First of all, analyze the umbrella adjusting mechanism of control theory, the power values are calculated under different wind turbines contraction Angle. Introduce umbrella adjusting mechanism of the main structure, on the basis of the design parameters of wind turbines with umbrella, refer to the standard GB/T 17646-2013 umbrella of normal load,wind turbines and umbrella adjusting mechanism for the analysis of specific load.According to calculate, check the strength and fatigue life cycle checking.Secondly, the analysis control system of the umbrella regulator, calculate the umbrella adjusting mechanism of action travel is 224 mm, the action Angle range of 0 ° to 60 °.According to the calculated maximum thrust required to umbrella regulator action 33 k N,design of electric putter thrust for 40 k N, meet the power needs of the adjusting mechanism for the umbrella. According to the umbrella regulator control strategy, choose corresponding electronic components, structures, umbrella adjusting mechanism of the control system.Finally, the test bench simulation speed regulating mechanism of 404 r/min, it can guarantee the normal work of the umbrella mechanism. On the properties of umbrella regulator control in wind tunnel test, the test data showed that umbrella the output power ofwind turbine in wind speed 13.5 m/s- 17 m/s range, output power "avalanche" phenomenon, analyzing the causes of mainly because of the change in the contraction of rotor Angle led to wind flow on the blade to lateral sliding, causing the instantaneous power decreases. In wind tunnel test, the umbrella wind turbines in the Angle of 47 ° of contraction, the tension of the pneumatic pressure and centrifugal force balance, the control values consistent with the theoretical value, the other Angle control, need to be revised.Umbrella mechanism is a new type of small wind turbine control mode, there is no corresponding design standard and design experience can be used as the basis. This design presents an umbrella design theory and method of adjusting mechanism, although there are some problems to be solved in the process of design, but still can offer good reference for designers. |
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