基于经验小波变换的畸变信号电量计量研究  

Research on Electric Quantity Measurement of the Distorted Signal Based on Empirical Wavelet Transform

作　　者：冯昆 徐天奇 李琰 王兴明 朱梦梦 FENG Kun;XU Tianqi;LI Yan;WANG Xingming;ZHU Mengmeng(The Key Laboratory of Cyber-Physical Power System of Yunnan Colleges and Universities,Yunnan Minzu University,Kunming 650504;Nanjing Hongyi Electrical Automation Co.,Ltd.,Nanjing 210039;Power Science Research Institute of Yunnan Power Grid Co.,Ltd.,Kunming 650217)

机构地区：[1]云南省高校电力信息物理融合系统重点实验室(云南民族大学),昆明650504 [2]南京弘毅电气自动化有限公司,南京210039 [3]云南电网有限责任公司电力科学研究院,昆明650217

出　　处：《计算机与数字工程》2023年第10期2224-2230,2262,共8页Computer & Digital Engineering

基　　金：国家自然科学基金项目(编号:62062068,61761049)资助。

摘　　要：随着非线性负荷大量接入电网,电网信号畸变严重,传统电量计量方法暴露出诸多问题。针对电网非平稳畸变信号的电量计量,提出一种基于经验小波变换的电量计量方法,能很大程度规避经验模态分解的模态混叠现象。构造电网典型稳态和时变电压、电流波形,利用经验小波变换分解、重构基波分量和畸变分量,计算畸变信号功率,并与经验模态分解、小波变换对比,经验小波变换自适应能力强、谐波分解准确、畸变信号还原度高、功率计量相对误差小,在电能测量领域有显著优势。With the extensive use of nonlinear loads in the power grid,the power grid signals are seriously distorted,and many problems are exposed in the traditional electricity measurement methods.Aiming at the electricity metering of non-stationary distorted signals in power grid,a new electricity metering method based on empirical wavelet transform is proposed,which can avoid the mode mixing phenomenon of empirical mode decomposition to a great extent.The typical steady-state and time-varying current and voltage waveforms are constructed.The empirical wavelet transform method is used to decompose and reconstructs the fundamental component,and the distortion component,respectively,and the distorted signal power is calculated.Compared with the empirical mode decomposition method and wavelet transform method,the empirical wavelet transform method has a robust adaptive ability,accurate harmonic decomposition,a high degree of distortion signal reduction,and a small relative error of power measurement.It has a significant advantage in the field of electric power measurement.

关 键 词：经验小波变换 小波变换 经验模态分解 非线性负荷 畸变信号 电量计量 

分 类 号：TM933[电气工程—电力电子与电力传动]