基于部分重构辛几何模态分解的光伏直流电能质量去噪  

PV-DC energy quality denoising based on partially reconstructed symplectic geometric mode decomposition

作　　者：朱宪宇 熊婕 刘良江 李庆先 左从瑞 刘青 ZHU Xianyu;XIONG Jie;LIU Liangjiang;LI Qingxian;ZUO Congrui;LIU Qing(Hunan Institute of Metrology and Testing,Changsha 410014,China)

机构地区：[1]湖南省计量检测研究院,湖南长沙410014

出　　处：《电气应用》2024年第6期95-102,共8页Electrotechnical Application

基　　金：长沙市杰出创新青年培养计划(kq2106086)资助项目。

摘　　要：光伏直流系统中纹波、突变和噪声等扰动影响电能质量评估准确度,为克服传统辛几何模态分解(SGMD)存在计算效率随着数据量增加迅速降低以及重构时无效辛几何初始单分量影响分解准确性的问题,提出了基于部分重构辛几何模态分解(PRSGMD)的光伏直流电能信号去噪方法。PRSGMD利用复合多尺度模糊熵(CMFE)能够克服光伏直流电信号初始单分量相似性度量突变的不足,构建了正则化复合多尺度模糊熵(RCMFE)算子,评估各初始单分量重构后的复杂度并约束残余量能量最小,结合部分重构阈值指标筛选出部分显著初始单分量进行重构,从而有效提升分解效率并避免微弱无效初始单分量影响分解准确度。仿真和实验分析结果表明,PRSGMD能有效滤除噪声并分离光伏直流电信号中的复合扰动。Disturbances such as ripple,mutation and noise in PV-DC system affect the accuracy of power quality assessment.In order to overcome the problem that the calculation efficiency of traditional Symplectic Geometry Mode Decomposition(SGMD)decreases rapidly with the increase of data volume,and the initial single component of invalid symplectic geometry affects the accuracy of decomposition during reconstruction.A Partial Reconstruction Symplectic Geometry Mode Decomposition(PRSGMD)method for PV-DC energy quality signal denoising is proposed.PRSGMD uses the advantage that Composite Multiscale Fuzzy Entropy(CMFE)can overcome the mutation of the initial single component similarity measurement of PV-DC signal,The Regulated Composite Multiscale Fuzzy Entropy(RCMFE)operator is constructed to evaluate the complexity of each initial single component after the reconstruction,and the residual energy is constrained to the minimum.Some significant initial single components are selected for reconstruction by combining the threshold index of nonparametric partial reconstruction,to effectively improve the decomposition efficiency and avoid weak and invalid initial single component affecting the decomposition accuracy.The simulation and experimental results show that PRSGMD can effectively filter out the noise and separate the compound disturbances in PV-DC signal.

关 键 词：光伏 直流电能 复合扰动 部分重构辛几何模态分解 正则化复合多尺度模糊熵 

分 类 号：TM615[电气工程—电力系统及自动化] TM721.1