基于AR模型的电力系统间谐波分析_张惠娟.pdf

2010 年 7 月 电 工 技 术 学 报 Vol.25 No. 7 第 25 卷第 7 期 TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY Jul. 2010 基于AR 模型的电力系统间谐波分析 1 1 1 1 2 张惠娟 汪友华 王艳廷 宗世芳 李呈祥 (1. 河北工业大学电气与自动化学院 天津 300132 2. 塔里木油田油气生产技术部 库尔勒 841000) 摘要 间谐波的存在给电力系统的安全、经济运行带来极大的危害，因此，对电力系统间谐 波进行准确、可靠的分析有着重要的实际意义和科研价值。对于电力系统中的实际信号，其各谐 波和间谐波成分往往是不能事先确定的，在信号FFT 的频谱中不能很好地确定哪些谱线是信号的 实际频率分量，哪些是频谱泄露所产生的虚假谱线。本文采用AR 模型谱估计得到信号的各频率 成分后，再结合Rife-Vincent （Ⅲ）窗的双峰谱线插值算法对各成分的幅值、频率和相角提出了新 的修正方法，很好地解决了上述问题。仿真分析结果验证了本文的方法具有更高的精度。 关键词：间谐波 插值FFT AR 模型 双峰谱线插值算法 中图分类号：TM715 Power System Interharmonics Analysis Based on Autoregression Model Zhang Huijuan 1 Wang Youhua 1 Wang Yanting 1 Zong Shifang 1 Li Chengxiang2 (1. Hebei University of Technology Tianjin 300132 China 2. Tarim Oil and Gas Production Technology Department Korla 841000 China) Abstract Interharmonics does very harm to the security and economical operation of power system. Therefore, it is necessary and important to do researches on analyzing harmonics and interharmonics accurately and reliably. For the actual signal of power system, harmonics and interharmonics is not often determined in advance. So in the FFT spectrum, it is not easy to determine that which are the actual frequency signal lines, which are the false spectral lines. Autoregression (AR) model is adopted in this paper to obtain each frequency component of signal. Then the double spectrum peaks interpolation algorithm of Rife-Vincent (Ⅲ) is used to correction the amplitude, frequency, and phase angle. Simulation results indicate that the proposed approach is more accurate. Keywords ：Interha