| 引用本文: | 徐志钮,胡宇航,赵丽娟,樊明月,郭文翰,覃华.基于单斜坡法的光电复合海缆温度、应变快速测量方法[J].电力自动化设备,2020,40(5): |
| XU Zhiniu,HU Yuhang,ZHAO Lijuan,FAN Mingyue,GUO Wenhan,QIN Hua.Rapid temperature and strain measurement method for optic-electric composite submarine cable based on slope-assisted method[J].Electric Power Automation Equipment,2020,40(5): |
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| 摘要: |
| 介绍了海缆监测的必要性和基于光纤分布式传感的高压光电复合海缆在线监测系统。为了提高基于布里渊散射的海缆温度、应变测量的实时性，介绍了单斜坡法的原理并将其引入海缆在线监测方法中。给出了基于洛伦兹模型时单斜坡法布里渊频移的计算公式。基于数值产生不同信噪比的布里渊谱和实测裸光纤/海缆复合光纤的布里渊谱。比较了单斜坡法和基于扫频方式的谱拟合法的准确性和实时性，重点研究了布里渊谱不同信噪比和光纤沿线布里渊频移不同程度波动情况下工作点的选择问题。结果表明：单斜坡法可使布里渊谱测量时间减少到原来的几十分之一甚至更小，同时布里渊频移误差仅小幅增加。用于海缆温度和应变监测时单斜坡法工作点建议选择为光纤沿线布里渊频移的均值减去一半的线宽，所确定的工作点对不同信噪比和光纤/海缆复合光纤沿线布里渊频移常见程度波动情况均具有不错的适应性。 |
| 关键词: 海缆 光纤分布式传感 温度和应变 单斜坡法 在线监测 |
| DOI：10.16081/j.epae.202005005 |
| 分类号:P756.1 |
| 基金项目:国家自然科学基金资助项目(51607066,61377088)；中央高校基本科研业务费专项资金资助项目(2020YJ005,2019-MS090,2019MS085)；河北省自然科学基金资助项目(E2019-502177) |
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| Rapid temperature and strain measurement method for optic-electric composite submarine cable based on slope-assisted method |
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XU Zhiniu1, HU Yuhang1, ZHAO Lijuan1, FAN Mingyue1, GUO Wenhan1, QIN Hua2
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1.School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China;2.Grid Planning & Research Center, Guangxi Power Grid Corporation, Nanning 530000, China
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| Abstract: |
| The necessity of submarine cable monitoring and the on-line monitoring system of high voltage optic-electric composite submarine cable based on distributed optical fiber sensing technology are introduced. The principle of slope-assisted method is introduced and applied to the on-line monitoring of submarine cable in order to improve the real-time performance of temperature and strain measurement of submarine cable based on Brillouin scattering. The formula for calculating the Brillouin frequency shift of the slope-assisted method based on Lorentzian model is given, then the Brillouin spectrum with different values of SNR(Signal Noise Ratio) and the Brillouin spectrum of bare optical fiber/submarine cable composite optical fiber are numerically generated and measured. Then, the accuracy and real-time performance are compared between slope-assisted method and spectrum fitting method based on frequency sweeping, and the selection of probe frequency for varying degrees of fluctuation of Brillouin frequency shift along the fiber and SNR of Brillouin spectrum is emphatically studied. The result shows that the measurement time of Brillouin spectrum can be reduced by a few tens of times or even shorter by slope-assisted method, and the measurement error of Brillouin frequency shift only slightly increases. It is recommended to choose the average Brillouin frequency shift along optical fiber minus half of the linewidth as the probe frequency when slope-assisted method is applied to monitoring the temperature and strain of submarine cables, which has good adaptability to different values of SNR of Brillouin spectra and common fluctuation of Brillouin frequency shift along optical fiber/submarine cable composite optical fiber. |
| Key words: submarine cable distributed optical fiber sensing temperature and strain slope-assisted method on-line monitoring |
