Offshore wind turbine non-contact impeller rotating speed monitoring method based on underwater sound signals

Abstract

The invention discloses an offshore wind turbine non-contact impeller rotating speed monitoring method based on underwater sound signals, and relates to the technical field of wind power. A hydrophoneis used for collecting offshore wind turbine operation period underwater noise close to a wind turbine in real time, a stochastic resonance method is used for extracting the line spectrum frequency of the operation period underwater noise, and then the frequency is used for inverting the impeller rotating speed of the wind turbine. And compared with a preset threshold value, when it is found thatthe rotating speed of the impeller is abnormal, the system gives an alarm and stops the running of the draught fan so as to guarantee the safety of the wind turbine. A monitoring instrument does notneed to be installed on a rotating shaft or other firmware of the wind turbine, the risks caused by abrasion, falling and the like due to the fact that an existing monitoring instrument needs to makedirect contact with the wind turbine for a long time are avoided, and the impeller rotating speed can be effectively monitored; the real-time changes of underwater noise in the offshore wind farm operation period can be tracked and monitored, key parameters are provided for the influence evaluation of marine environment noise, and the method has the advantages of being simple, low in cost, convenient to arrange and the like.

Description

technical field [0001] The invention relates to the technical field of wind power, in particular to a non-contact impeller speed monitoring method of an offshore fan based on an underwater acoustic signal. Background technique [0002] With the depletion of fossil energy and the advocacy of the concept of sustainable development, green and clean wind power has developed rapidly. Compared with onshore wind energy, offshore wind energy has the advantages of high wind speed, high wind power density, and does not occupy onshore land, which makes the center of gravity of wind power generation shift from land to sea. In current wind power generators, variable-speed and variable-pitch wind power generators are commonly used. ([1] Chen Xuefeng, Guo Yanjie, Xu Caibin, Shang Hongbing. A Review of Wind Power Equipment Fault Diagnosis and Health Monitoring [J]. China Mechanical Engineering, 2020, 31(02): 175-189.) Under certain circumstances, the speed of the wind turbine can be adjus...

AI Technical Summary

Problems solved by technology

However, the background noise of the ocean is complex, and the noise of wind and waves, tidal currents, and distant ship noise are all relatively large. During the operation period, the underwater acoustic signal is often covered by the background noise of the ocean, and the line spectrum frequency is not obvious.

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