光学电压互感器谐波测量影响因素及分析  

Influencing Factors and Analysis of Harmonic Measurement of Optical Voltage Transformer

作　　者：王宇航 刘有为 WANG Yuhang;LIU Youwei(College of Electric and Electronic Engineering,North China Electric Power University,Beijing 102206,China;China Electric Power Research Institute,Beijing 100192,China)

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]中国电力科学研究院有限公司,北京100192

出　　处：《自动化仪表》2021年第6期14-18,共5页Process Automation Instrumentation

基　　金：国家电网公司科技基金资助项目(JS71-17-003)。

摘　　要：随着新能源、直流电网的快速发展及变频用电技术的兴起,电网谐波问题日趋凸显,严重影响电能质量。电网谐波测量对谐波治理、区分用户谐波责任极为重要。传统电磁式电压互感器存在线性饱和,高次谐波测量能力有限。光学电压互感器(OVT)体积小、质量轻、频率响应范围宽、无饱和现象、抗电磁干扰性能佳,在谐波测量领域具有优势。针对电网中谐波占比小、谐波小信号测量误差的情况,对光学电压互感器传变特性进行了研究,建立了光学电压互感器的仿真模型。通过仿真和试验,分析了采样速率、量化误差、噪声以及频谱泄漏问题,对谐波测量准确的影响。此外,发现OVT的噪声会随着温度的升高出现明显的高频畸变和低频畸变现象。所提出的滤波方式,能够在不牺牲带宽的前提下有效抑制噪声的影响。With the rapid development of new energy,DC grid and variable-frequency technology,the problem of harmonic in power grid is increasingly severe to affect power quality.Harmonic measurement of power grid is very important to harmonic control and distinguishing responsibility users.However,the traditional electromagnetic voltage transformer presents linear saturation and limited high-order harmonic measurement ability.Optical voltage transformer(OVT)has advantages of small volume,light weight,wide frequency response range,no saturation phenomenon and good anti-electromagnetic interference performance.So it’s suitable for harmonic measurement.Aiming at the situation of small harmonic proportion and small signal measurement error in power grid,the transmission characteristics of optical voltage transformer are studied,and the simulation model of optical voltage transformer is established.Besides that,the OVT noise along with rising temperature appears distortion of high-frequency and low-frequency.The porposed method can suppress the phenomenon without bandwidth loss.

关 键 词：智能电网 光学电压互感器 谐波测量 噪声 量化误差 滤波 频谱泄漏 幅频特性 

分 类 号：TH-39[机械工程]