摘要
为准确测量介质损耗角,克服基波频率波动、采样率不同、模数转换器位数变化及噪声干扰等因素影响,提出一种基于时域采样序列重构的介质损耗角测量方法。通过对原始采样序列进行移频滤波实现对基波频率的准确估计,结合估计基波频率和三次样条插值方法实现实际电压和电流采样序列的重构,通过对重构后的电压和电流采样序列分别进行快速傅里叶变换实现介质损耗角的准确求取。仿真结果表明所提算法能够实现对介质损耗角的准确测量且不受非同步采样限制和噪声的影响。实际构建的硬件测试平台验证了该算法的准确性。
In order to measure dielectric loss angle(DLA)accurately,and overcome the defects caused by fundamental frequency fluctuation,sampling rate,word length of the analog-to-digital converter,and noise,a dielectric loss angle measurement algorithm based on sequence reconstruction is proposed in this paper.Firstly,the fundamental frequency is estimated accurately through frequency shifting and filtering on the original sampling sequence.Then,the sampling sequence of actual voltage and current is reconstructed by combining the estimated frequency and cubic spline interpolation method.Finally,the fast Fourier transform of the reconstructed voltage and current sampling sequence is implemented to obtain the dielectric loss angle accurately.Simulation results show that the new algorithm proposed in this paper can accurately measure the dielectric loss angle,which is not affected by the limit of asynchronous sampling and the influence of noise.The practical experiments using the hardware test platform verified the accuracy and effectiveness of the new algorithm.
作者
王永
滕召胜
李建闽
唐求
成达
Wang Yong;Teng Zhaosheng;Li Jianmin;Tang Qiu;Cheng Da(College of Electrical and Information Engineering Hunan University Changsha 410082 China;China Electric Power Research Institute Beijing 100192 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2018年第23期5607-5615,共9页
Transactions of China Electrotechnical Society
基金
国家自然科学基金面上项目资助(51377049)
关键词
介质损耗角
移频
滤波
快速傅里叶变换
三次样条插值
Dielectric loss
frequency shifting
filtering
fast Fourier transform
cubic spline interpolation
作者简介
王永,男,1979年生,博士研究生,研究方向为电力信号分析、信息融合与智能信息处理。E-mail:wangyong1179@163.com;滕召胜,男,1963年生,教授,博士生导师,研究方向为电气测量技术及智能信息处理技术。E-mail:tengzs@126.com(通信作者)。
