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Wind turbine blade fatigue life real-time monitoring method

A technology for wind turbine blades and fatigue life, applied in the field of monitoring, can solve the problems of complex operation, inconvenient maintenance, and low measurement accuracy.

Inactive Publication Date: 2013-04-24
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

On the one hand, due to the randomness and uncontrollability of wind speed, it is very difficult to measure wind speed, and the measurement accuracy is not high, which leads to large errors in the final calculated fatigue life; on the other hand, this method requires the installation of a large number of sensors, not only The operation is complicated, and it is not easy to maintain, and the monitoring cost is high

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  • Wind turbine blade fatigue life real-time monitoring method

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Embodiment Construction

[0050] Momentum theory is a classic aerodynamic theory of wind turbines. The role of the wind wheel is to convert the kinetic energy of the wind into mechanical energy. According to the Betz theory, under ideal circumstances, the Bernoulli equation is applied and the axial induction factor is considered , The wind wheel can absorb up to 59.3% of wind energy. According to the leaf element theory, the wind turbine blade is divided into many micro-segments along the span direction. These micro-segments are called leaf elements, and it is believed that the flow on each leaf element does not interfere with each other. The load distribution on wind turbine blades is very complicated. Under the same wind speed, at different leaf elements of the blade, the axial induction factor Circumferential Inducer , Inflow angle ,Angle of attack , Pitch angle , Relative wind speed The other parameters are different; under different wind speeds, the parameters of each leaf element of the bla...

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Abstract

Provided is a wind turbine blade fatigue life real-time monitoring method. The wind turbine blade fatigue life real-time monitoring method real time measures output power, rotating speed and pitch angle of a wind wheel, and reversely pushes out relative wind speed of a random blade element of the blade according to monitoring data, and then apply blade element-momentum (BEM) principle to calculate loading impacted on each blade element, and then calculate loading of the whole blade through integration, form stress spectrum, and eventually use rain-flow counting method to count stress cycle times and accordingly conduct life loss calculation, and obtain fatigue life of wind turbine blade. The power of the wind turbine acts as a monitoring quantity, wind turbine blade fatigue life is obtained by theoretical calculation. The wind turbine blade fatigue life real-time monitoring method has the advantages that not only accuracy of measured data and reliability of monitoring results are guaranteed, but also the whole monitoring process relies on the existing system, and no large quantity sensor is needed to be additionally install. The wind turbine blade fatigue life real-time monitoring method has the advantages of being convenient in implement, low in monitoring cost and the like. The real-time monitoring method of wind turbine blade fatigue life is an ideal method of analyzing and evaluating wind turbine operating safety.

Description

Technical field [0001] The invention relates to a method for on-line monitoring the fatigue life of a wind turbine blade by measuring power, rotation speed and pitch angle, and belongs to the technical field of monitoring. Background technique [0002] In the past ten years, the wind power industry has developed rapidly, the total installed capacity has risen sharply, and the power of wind turbines has continued to increase. Now 1~2MW wind turbines have become the mainstream models in the market, and 3MW and 5MW wind turbines have been put into operation. The size of the wind turbine impeller increased from 40 meters to more than 100 meters. The wind turbine blade is the core component of the wind turbine, and its safety and reliability are the decisive factors to ensure the normal and stable operation of the wind turbine. The loads that cause damage to wind turbine blades can be divided into two categories: extreme loads and fatigue loads. Extreme load refers to the load actin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00
Inventor 安利强孙少华赵鹤翔葛永庆
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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