摘要
海缆作为连接海上风电场和陆上集中控制中心的“纽带”,承担着整个风电场的电力传输和通信任务。本文以实时监测海缆运行状态、提高海缆故障诊断效果为目标,构建计及复杂海洋环境适应性的海缆敷设故障特征提取模型。本文基于复杂海洋环境对海缆敷设的影响,分析布里渊频移与电缆温度、应变的关系,构建三者之间的线性方程;结合拉曼散射信号的温度响应特性,通过确定海缆温度区分应变的变化范围;采用小波六层分解法实现监测到布里渊频移信号的软阈值去噪,选用消失矩大的小波基检测去噪信号的奇异点;按频域从低到高进行小波三层分解;经小波系数重组后,建立海缆敷设故障特征提取模型,求解各频域信号的能量、标准差特征向量,实现海缆敷设故障特征提取。实验结果表明:布里渊频移与电缆应变、温度呈线性关系;去噪后信号波形平滑、故障特征保留完好,该模型可提取不同故障的故障特征,故障特征提取效果突出。本研究为保证海缆运行状态的稳定性和适应性提供一种切实可行的方法。
As the"link"connecting offshore wind farm and onshore centralized control center,submarine cable undertakes the power transmission and communication tasks of the whole wind farm.Aiming at real-time monitoring the operation status of submarine cable and improving the effect of submarine cable fault diagnosis,a submarine cable laying fault feature extraction model considering the adaptability of complex marine environment is constructed.Based on the influence of complex marine environment on submarine cable laying,the rela-tionship between Brillouin frequency shift and cable temperature and strain is analyzed,and the linear equation between them is construct-ed;Combined with the temperature response characteristics of Raman scattering signal,the variation range of strain is distinguished by de-termining the submarine cable temperature;The wavelet six layer decomposition method is used to realize the soft threshold denoising of the monitored Brillouin frequency shift signal,and the wavelet base with large vanishing moment is selected to detect the singular points of the denoised signal;Wavelet three-level decomposition from low to high in frequency domain;After the reorganization of wavelet coefficients,the submarine cable laying fault feature extraction model is established,and the energy and standard deviation feature vectors of each fre-quency domain signal are solved to realize the submarine cable laying fault feature extraction.The experimental results show that the Bril-louin frequency shift has a linear relationship with cable strain and temperature;After denoising,the signal waveform is smooth and the fault features are well preserved.The model can extract the fault features of different faults,and the effect of fault feature extraction is outstand-ing.It provides a practical method to ensure the stability and adaptability of submarine cable operation state.
作者
刘黎
王勇
桑清城
位一鸣
LIU Li;WANG Yong;SANG Qingcheng;WEI Yiming(State Grid Zhejiang Electric Power Company Zhoushan Power Supply Company,Zhoushan 316021,China)
出处
《海洋技术学报》
2022年第2期103-109,共7页
Journal of Ocean Technology
基金
国家重点研发计划资助项目(2017YFF0206401)。
关键词
海洋环境
海缆敷设
故障特征
布里渊频移
实时监测
特征向量
marine environment
submarine cable laying
fault characteristics
brillouin frequency shift
real time monitoring
feature vector
