基于改进mSDFT算法的谐波信号提取方法  

A Harmonics Signal Extraction Method Based on Improved mSDFT Algorithm

作　　者：李艳 林晓明 赵宇明 张帆 何山 钱斌 LI Yan;LIN Xiaoming;ZHAO Yuming;ZHANG Fan;HE Shan;QIAN Bin(Shenzhen Power Supply Bureau Co.Ltd,Shenzhen,Guangdong 518001,China;Electric Power Research Institute,CSG,Guangzhou,Guangdong 510670,China;Guangdong Provincial Key Laboratory of Intelligent Measurement and Advanced Metering of Power Grid,Guangzhou,Guangdong 510670,China)

机构地区：[1]深圳供电局有限公司,广东深圳518001 [2]南方电网科学研究院,广东广州510670 [3]广东省电网智能量测与先进计量重点实验室,广东广州510670

出　　处：《计量学报》2024年第10期1435-1443,共9页Acta Metrologica Sinica

基　　金：国家重点研发计划(2019YFE0118700);深圳供电局有限公司科技项目(SZKJXM20210138)。

摘　　要：提出了一种改进mSDFT算法,该算法通过分解传统mSDFT算法的传递函数内含的梳状滤波器的结构,保留梳状滤波器中特定的零点,用于提取电网信号中指定次谐波,其余零点组成单独因子,用于指定次谐波频谱的幅值校正和相位校正。分解梳状滤波器的结构后,梳状滤波器中包含的零点减少,从而降低了算法的瞬态响应的延迟。进一步阐述了改进mSDFT算法的原理并完成了公式推导,仿真结果表明:该算法能够在谐波信号发生突变的情况下,快速跟踪提取出变化后的谐波信号,瞬态响应的延迟由10^(-2)s量级降低为10^(-3)s量级,同时具有无累计误差和稳定的优点。An improved mSDFT algorithm is proposed.For the improved algorithm,the structure of the comb filter contained in the transfer function generated from the traditional mSDFT algorithm is decomposed.That means retaining the specific zero points in the comb filter whose effect is to extract the specified harmonic in the power grid signal and making rest of zero points form a separate factor whose effect is amplitude correction and phase correction.The number of zeros contained in the comb filter is decreased by decomposing the structure of the comb filter,therefore,the delay time of the transient response is reduced.Besides,the principle of improved mSDFT algorithm is expounded and the formula derivation is completed.The results of simulation show that the improved algorithm can quickly track and extract the changed harmonic when the harmonic signal changes suddenly which indicates that it reduces the transient response delay of the traditional mSDFT algorithm,and has the advantages of no cumulative error and stability.

关 键 词：电学计量 改进mSDFT算法 谐波提取 充电桩谐波 负载不平衡 电网信号 电能质量 

分 类 号：TB971[一般工业技术—计量学]