基于小波和改进相关分析的介损测量方法
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摘要
相关函数法用于介损在线测量时,电网频率波动及存在高次谐波等因素严重影响了基波相位测量的准确度。为了提高相关函数介损在线测量的准确度,文中首先对这种方法存在的问题进行了简要分析,在此基础上提出了对传统相关函数法进行改进的措施,其主要思想是对采样频率和数值积分方法进行修正和改善,并利用小波分析这一优良的时频分析工具提取基波信号。仿真分析和实践表明,改进方法较原有相关函数法在测量准确度上有较大的提高。
When the correlation function algorithm is used to measure the dielectric loss, the measurement accuracy of fundamental wave can be badly affected by the fluctuation of system frequency and disturbance from harmonic and so on. To increase the on-line measurement accuracy, the problem that may debase the accuracy is studied firstly, then the approaches for improving the traditional correlation function method are put forward, with the main idea of improving and modifying the sampling frequency and numeric integral method. In addition, the wavelet analysis is used to distill the fundamental wave. Simulation and practical results verify the higher accuracy of the improved method.
When the correlation function algorithm is used to measure the dielectric loss, the measurement accuracy of fundamental wave can be badly affected by the fluctuation of system frequency and disturbance from harmonic and so on. To increase the on-line measurement accuracy, the problem that may debase the accuracy is studied firstly, then the approaches for improving the traditional correlation function method are put forward, with the main idea of improving and modifying the sampling frequency and numeric integral method. In addition, the wavelet analysis is used to distill the fundamental wave. Simulation and practical results verify the higher accuracy of the improved method.
引文
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[8]李庆扬,王能超,易大义．数值分析．北京:清华大学出版社, 2001． LI Qing-yang, WANG Neng-chao, YI Da-yi. Numerical Analysis. Beijing: Tsinghua University Press, 2001.
[2]柴旭峥,文习山,关根志,等．绝缘在线监测采样数据的两种预处 理算法．高电压技术,2002,28(9):26-27． CHAI Xu-zheng, WEN Xi-shan, GUAN Gen-zhi et al. Study on Algorithm Used to Preprocess the Sampling Data in Insulation On-line Monitoring. High Voltage Engineering, 2002, 28(9): 26-27.
[3]卢文祥,杜润生．机械工程测试·信息·信号分析．武汉:华中科 技大学出版社,1999． LU Wen-xiang, DU Run-sheng. Measurement Information Signal Analysis in Mechanical Engineering. Wuhan: HUST Press, 1999.
[4]郑治真,沈萍,杨选辉,等．小波变换及其MATLAB工具的应 用．北京:地震出版社,2001． ZHENG Zhi-zhen, SHEN Ping, YANG Xuan-hui et al. Wavelet Transforms and Their Application with MATLAB Tools. Beijing: Earthquake Press, 2001.
[5]王建赜,纪延超,冉启文,等．新小波的构造及其在电力系统中的 应用．电力系统及其自动化学报,1999,11(3):74-79． WANG Jian-ze, JI Yan-chao, RAN Qi-wen et al. New Wavelet Construction and Application in Power System. Proceedings of the EPSA, 1999, 11(3): 74-79.
[6]磨少清,李啸骢．一种高精度的改进傅里叶测频算法．电力系统 自动化,2003,27(12):48-49． MO Shao-qing, LI Xiao-cong. An Improved High-accuracy Algorithm for Frequency Measuring Based on Fourier Transform. Automation of Electric Power Systems, 2003, 27(12):48-49.
[7]王楠,律方成,梁英．基于修正理想采样频率的谐波分析法在介 损在线测量中的应用．电测与仪表,2003,40(7):12-15． WANG Nan, LU Fang-cheng, LIANG Ying. Application of Harmonics Analysis Approach Based on Modified Ideal Sampling Frequency in Online Measuring tan δ. Electrical Measurement & Instrumentation, 2003, 40(7):12-15.
[8]李庆扬,王能超,易大义．数值分析．北京:清华大学出版社, 2001． LI Qing-yang, WANG Neng-chao, YI Da-yi. Numerical Analysis. Beijing: Tsinghua University Press, 2001.
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