适应频率偏移及动态变化场景的动态谐波相量在线测量方法  

Online Measurement Method of Dynamic Harmonic Phasor for Frequency Deviation and Frequency Dynamic Changing Conditions

作　　者：靳宗帅 张恒旭[1] 曾一鸣 石访 刘远龙 JIN Zongshuai;ZHANG Hengxu;ZENG Yiming;SHI Fang;LIU Yuanlong(Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education(Shandong University),Jinan 250061,Shandong Province,China;State Grid Shandong Electric Power Company,Jinan 250001,Shandong Province,China)

机构地区：[1]电网智能化调度与控制教育部重点实验室(山东大学),山东省济南市250061 [2]国网山东省电力公司,山东省济南市250001

出　　处：《中国电机工程学报》2024年第22期8759-8770,I0006,共13页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家重点研发计划项目“响应驱动的大电网稳定性智能增强分析与控制技术”(2021YFB2400800)。

摘　　要：电力电子装置接入加剧了新能源电网谐波污染,动态谐波相量高精度在线测量是谐波监测、溯源、抑制的关键前提。泰勒傅里叶变换方法虽然能够高精度测量动态谐波相量,但在频率偏移和频率动态变化场景下繁重的计算负担与内存开销使其难以应用于资源有限的嵌入式测量单元,是工程应用的主要障碍。针对该问题,该文理论分析谐波频率偏离滤波通带中心情况下的测量误差,阐明频率偏差测量值与真实值的非线性关系,提出基于频率偏差牛顿迭代修正的动态谐波相量快速测量方法,解决频率偏移及动态变化场景下基于泰勒傅里叶变换的动态谐波相量高精度在线测量难题。仿真结果表明,所提方法在频率偏移、频率斜坡、频率振荡、幅值斜坡、幅值振荡等多种场景下能够实现动态谐波相量高精度测量,且执行过程内存需求小、计算复杂度低。最后,将所提方法应用于嵌入式测量单元,通过实时测量电网实际动态场景的含谐波电磁重构波形回放信号,进一步验证了所提方法测量精度与测量速度,展示了该方法在新能源电网动态谐波相量高精度在线测量方面的应用潜力。New energy power generations are integrated into power grids using power electronic devices,which intensifies the harmonic pollution of power grids.High-precision online measurement of dynamic harmonic phasor is the key prerequisite for harmonic monitoring,localization and suppression.The Taylor Fourier transform method can track time-varying harmonic phasor with high accuracy,but the heavy computational burden and memory requirement in the frequency deviation and frequency dynamic changing conditions make it difficult to be applied to embedded measurement units with limited resources,which is the main obstacle to engineering applications.In regard to this problem,the identification error is theoretically analyzed when the harmonic frequency deviates from the central frequency of passband of Taylor Fourier transform filter,and the nonlinear relationship between the measured value of frequency deviation and the true value is elucidated.Then a fast measurement method of dynamic harmonic phasor based on Newton iterative correction of frequency deviation is proposed,which solves the problem of high-precision online measurement of dynamic harmonic phasor based on Taylor Fourier transform in frequency deviation and dynamic change conditions.The simulation results show that the proposed method can achieve high-precision measurement of dynamic harmonic phasor in several conditions such as large-range frequency deviation,frequency ramp change,frequency oscillation change,magnitude ramp change,magnitude oscillation change,etc.The proposed method requires small memory space and low computational burden.Finally,the measurement method of dynamic harmonic phasor is implemented in the embedded measurement unit,and the measurement accuracy and execution speed are further verified by measuring the playback signal of the reconstructed electromagnetic waveform distorted by harmonics based on an actual dynamic condition of the power grid in real time,demonstrating the application potential of the proposed method in high-precision on

关 键 词：动态谐波相量 频率偏移 频率动态变化 泰勒傅里叶变换 新能源电网 

分 类 号：TM935[电气工程—电力电子与电力传动]