Calculation method for vibration state of wind turbine generator system tower based on modal superposition method

Abstract

The invention discloses a calculation method for the vibration state of a wind turbine generator system tower based on a modal superposition method. The calculation method comprises the steps of firstly, establishing a finite element model of a tower; then, calculating with a finite element method to obtain a truncation modal matrix of the tower, and calculating according to real-time vibration values of monitoring points to obtain a vibration principal coordinate vector of the tower; and finally, calculating with a modal superposition method to obtain the real-time vibration state of the whole tower. According to the method, the vibration state of the whole tower can be obtained through quick calculation according to the real-time vibration values of finite vibration monitoring points ofthe tower; and the calculation method has the characteristics of high calculation accuracy and speed, and the requirements of real-time online calculation can be met.

Description

Technical field [0001] The invention belongs to the technical field of measurement, and particularly relates to a method for calculating the vibration state of a wind turbine tower. Background technique [0002] Wind power generation has the advantages of good economic benefits, cleanliness, and pollution-free, and is currently one of the most promising renewable energy sources. In recent years, technological advances in wind turbines have reduced the cost of wind power generation and have also promoted the rapid development of wind power projects. So far, the diameter of the impeller and the height of the tower have been increased from tens of meters to more than 120m. The wind power tower is a highly flexible structure and the working conditions are harsh. In addition to supporting the weight of the wind turbine, the tower must also bear the blow to the wind turbine and tower. The wind pressure and the dynamic load during the operation of the wind turbine will directly affect ...

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Problems solved by technology

[0003] The finite element transient simulation is one of the effective methods to study the vibration characteristics of the whole tower under the fluctuating wind load and other external excitations. However, this method has the problems of large amount of calculation and low calculation efficiency.

The vibration state of the tower is affected by many uncertain factors, which makes it difficult to guarantee the reliability of the analysis results obtained by the data-driven method

Real-time monitoring of tower vibration by arranging ultra-low frequency acceleration sensors on the tower can avoid problems such as low computational efficiency caused by finite element transient simulation and unreliable analysis results obtained by data-driven methods. However, this method can only get The vibration value of a limited number of monitoring points on the tower cannot realize the monitoring and analysis of the vibration state of the entire tower

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