An environmental load prediction method and vibration pre-control system for offshore wind turbines

Abstract

The invention discloses an environmental load prediction method and a vibration pre-control system for an offshore wind turbine, including an offshore wind turbine structure, a wind speed measurement device fixedly connected to the wind turbine structure, a magnetorheological damper array, a wave height measurement device, Flow velocity measurement device, structural vibration control terminal; the structural vibration control terminal will carry out empirical mode decomposition and autoregressive sliding average model construction on the real-time data measured by wind speed measurement device, wave height measurement device and flow velocity measurement device, and realize the wind speed measurement , wave height, and flow velocity load prediction, and then combined with the digital twin model to output the control force of the magneto-rheological damper array, the multi-frequency vibration control of the offshore power unit structure is realized. The invention can obtain the influence of the load before the load acts on the structure, realize the advance control of the structure vibration, further avoid the transient maximum response generated by the structure, and reduce the damage of the structure and the mechanical device.

Description

technical field [0001] The invention relates to the field of offshore wind power development, in particular to an environmental load prediction method and a vibration pre-control system for an offshore wind turbine. Background technique [0002] The offshore wind turbine structure is a multi-subsystem combined engineering equipment, including the upper wind turbine, the middle wind turbine tower, the lower structure foundation (fixed foundation, floating foundation) and other auxiliary components. These subsystems have different dynamic properties, bear different loads in their work, and there is an inseparable coupling relationship between them. [0003] The structure of offshore wind turbines has been subjected to a variety of complex random loads during the service period, including wind, waves, currents, ice, tides, ship berthing, etc. In particular, the structure of fixed offshore wind turbines will be affected by earthquakes, while floating offshore wind turbines Stru...

AI Technical Summary

Problems solved by technology

This control method can indeed achieve the purpose of multi-frequency control to a certain extent. The neural network and fuzzy control program solve the problem that the nonlinear physical model of the magnetorheological fluid is difficult to establish to a certain extent, but the control based on the real-time monitoring signal of the structural response It is a kind of hysteresis control. In the face of sudden extreme loads, it is very likely that the structure has suffered damage and damage before the device gives control instructions.

For offshore wind turbines, low-altitude jets, turbulence, thunderstorms, storm surges, deformed waves, and focused waves are all typical harsh short-term loads. The instantaneous extreme response of the structure is not uncommon, and hysteresis control is often difficult to control these sudden extreme loads.

In addition, it is difficult to install the sensors used to monitor real-time responses in actual projects, especially in the underwater part of the structure. Some sensors pre-installed in docks and factories are also very easy to be damaged during towing and construction. For example, damage and fall-off due to impact during piling operation of wind turbine foundation

Images