Analysis And Suppression Of Non-reciprocity Error Of Reflective Fiber Optic Voltage Sensor

As a new type of power system detection device,optical voltage sensor has the advantages of high voltage resistance,no magnetic saturation and high safety,which is the development trend of voltage sensor in the future.Complex and changeable application scenarios require it to have good environmental adaptability.However,the system output errors caused by temperature,vibration and manufacturing process seriously affect the long-term operation accuracy and stability of optical voltage sensor,and hinder its practical process.Therefore,the study of system environmental adaptability under different physical field disturbances is an important part of the engineering application of fiber optic voltage sensor.This project takes reflective converse piezoelectric fiber optic voltage sensor as the research object and aims to improve the system accuracy and stability under complex environment.It mainly researches the following contents.Firstly,based on the converse piezoelectric effect,polarization optics and other theoretical basis,the working principle and voltage sensitive mechanism analysis of the reflected fiber optic voltage sensor system are introduced in detail.The mathematical model of the reflected fiber optic voltage sensor system is established by Jones matrix method.On this basis,the mathematical model of non-reciprocity error is investigated.Based on the elasto-optical effect and thermo-optical effect of optical fiber and thermal expansion and elastic deformation(generalized hooke's law)of quartz crystal,and combined with the finite element method numerical simulation analysis method,the temperature field and stress field of the sensing head are analyzed.The temperature birefringence property of polarization-maintaining fiber and the deformation law of quartz crystal are studied.The effects on the nonreciprocity error of the system under the full temperature range(-40 ? +85,1/min)and different vibration amplitudes(1g?10g)are obtained,respectively.Secondly,in this paper,the influence of different fiber lengths and quartz crystal parameters(height,radius)on the output accuracy of the system is analyzed in detail,which provides a reliable reference for the structural optimization design of the sensing head.Finally,Based on the analysis of the non-reciprocity error of the system,this paper finds that the temperature change is the main influencing factor.Therefore,from the perspective of fiber,a fiber optic voltage sensor based on polarization-maintaining photonic crystal fiber is proposed.From the perspective of error compensation,a temperature compensation scheme based on the least square method is proposed.The simulation results verify the rationality and effectiveness of the two error suppression methods,which can greatly improve the accuracy and stability of the fiber optic voltage sensor system.The research of this project provides a reliable theoretical basis for solving the bottleneck problem of environmental adaptability of converse piezoelectric fiber optic voltage sensor.It provides new research ideas and methods for promoting its development,which is of great significance for the safe operation of power system.