Environmental load prediction method and vibration pre-control system for offshore wind turbine generator

Abstract

The invention discloses an environmental load prediction method and a vibration pre-control system for an offshore wind turbine generator. The vibration pre-control system for the offshore wind turbine generator comprises an offshore wind turbine generator structure, and a wind speed measuring device, a magneto-rheological damper array, a wave height measuring device, a flow velocity measuring device and a structure vibration control terminal which are fixedly connected with the offshore wind turbine generator structure respectively, wherein the structure vibration control terminal carries outempirical mode decomposition and autoregressive moving average model construction on real-time data measured by the wind speed measuring device, the wave height measuring device and the flow velocitymeasuring device, so that load prediction of the wind speed, the wave height and the flow velocity is achieved, a control force of the magneto-rheological damper array is output in combination with adigital twin model, and the multi-frequency vibration control of the offshore wind turbine generator structure is realized. According to the environmental load prediction method and the vibration pre-control system for the offshore wind turbine generator provided by the invention, the load influence can be obtained before the load acts on the structure, so that advanced control over structure vibration is achieved, then transient great response generated by the structure is avoided, and damage to the structure and a mechanical device is reduced.

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 structural foundation (fixed foundation, floating foundation) and other auxiliary components. These subsystems have different dynamic properties, bear different loads during work, and have an inseparable coupling relationship among them. [0003] The offshore wind turbine structure has been subjected to a variety of complex random loads during its service, including wind, waves, currents, ice, tides, ship berthing, etc. In particular, the fixed offshore wind turbine structure will be affected by earthquakes, and the floating offshore wind turbine The structure is subject ...

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

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