| 引用本文: | 聂欣昊,唐文虎,李 杰,等.计及频率偏移和谐波干扰的谐波相量估计方法[J].电力系统保护与控制,2024,52(24):44-52.[点击复制] |
| NIE Xinhao,TANG Wenhu,LI Jie,et al.Harmonic phasor estimation method considering frequency deviation and harmonic interference[J].Power System Protection and Control,2024,52(24):44-52[点击复制] |
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| 摘要: |
| 针对基于离散傅里叶变换(discrete Fourier transform, DFT)的谐波估计算法抗干扰性差、频率偏移下测量精度大幅下降等问题，提出了一种计及频率偏移和谐波干扰的谐波相量估计方法。首先，通过滤波器组和插值离散傅里叶变换(interpolated discrete Fourier transform, IpDFT)算法来准确获取基波相量的参数信息。然后，基于基波频率偏移量修正滤波器组的通带中心，并利用修正后的滤波器组和IpDFT来获得谐波相量的初始估计值。最后，通过幅值和相位补偿对IpDFT的初始估计值进行修正，实现谐波相量的精确估计。仿真结果表明，所提方法在基于IEC 60255-118-1标准生成的频率偏移、谐波失真、噪声干扰和多重干扰等多种场景下，能够为从一阶到五十阶的所有谐波相量提供低于5 mHz的频率误差和1%的综合矢量误差。 |
| 关键词: 谐波相量估计 频率偏移 谐波干扰 自适应带通滤波器组 插值离散傅里叶变换 |
| DOI：10.19783/j.cnki.pspc.240592 |
| 投稿时间：2024-05-13修订日期：2024-08-09 |
| 基金项目:国家自然科学基金项目资助(51977082)；广州市科技计划项目资助(2023A04J1589) |
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| Harmonic phasor estimation method considering frequency deviation and harmonic interference |
| NIE Xinhao,TANG Wenhu,LI Jie,WANG Gang |
| (School of Electric Power, South China University of Technology, Guangzhou 510640, China) |
| Abstract: |
| There are problems of poor anti-interference capability and significant measurement accuracy degradation under frequency offset of the harmonic estimation algorithm based on the discrete Fourier transform (DFT). To address this issue, a harmonic phasor estimation method considering frequency deviation and harmonic interference is proposed. First, parameter information on the fundamental phasor is accurately obtained by a filter bank and an interpolated discrete Fourier transform (IpDFT) algorithm. Then, the passband center of the filter bank is corrected based on the fundamental frequency offset and uses the corrected filter bank and IpDFT to obtain the initial estimation of the harmonic phasors. Finally, the initial estimation of the IpDFT is corrected by amplitude and phase compensation to achieve accurate harmonic phasor estimation. Simulation results demonstrate that the proposed method can provide a frequency error below 5 mHz and a total vector error below 1% for all harmonic phasors from the first to the fiftieth order in various scenarios including frequency offset, harmonic distortion, noise interference, and multiple disturbances, based on the IEC 60255-118-1 standard. |
| Key words: harmonic phasor estimation frequency deviation harmonic interference adaptive bandpass filter bank interpolated discrete Fourier transform |
