Experimental investigation and simulation on vibration of wind turbine in cooling system of wind power generation

Abstract

With the promotion of technology and policy, wind power generation is developing towards large-scale and offshore. Due to the great amount of heat and high maintenance cost, higher requirements are put forward for the cooling system, among which the vibration is particularly important. In this paper, the vibration problem of the wind turbine in the generator cooling system is studied. The vibration experiment is carried out and found that the vibration can be effectively controlled only when the motor frequency is dynamically balanced in all the range; Strengthening the connection between the wind turbine and the bracket, the vibration velocity is reduced from 48.1mm/s to 12.4mm/s; The frequency corresponding to the peak vibration velocity is changed at the same time; According to the modal analysis, the range of the natural frequency of the wind turbine coincides with that of the motor frequency, causing the resonance. In the structural design of the wind turbine, the coincidence of natural frequency and motor frequency should be avoided; The simulation results are in agreement with experimental results. This two methods can effectively solve the vibration problem.