| 基于改进DFT变换的高精度实时电网频率跟踪算法 |
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| 引用本文： | 刘凤新,孔繁征.基于改进DFT变换的高精度实时电网频率跟踪算法[J].电测与仪表,2006,43(11):6-9. |
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| 作者姓名： | 刘凤新 孔繁征 |
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| 作者单位： | 北京化工大学,信息科学与技术学院,北京,100029;北京化工大学,信息科学与技术学院,北京,100029 |
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| 摘 要： | 采用DFT进行电力系统谐波分析时由于很难做到同步采样和整周期截断，由此造成的频谱泄漏严重影响谐波分析的效果。提出了一种适于高精度实时电力谐波分析的自适应调整采样频率的电网频率跟踪算法。该算法先采用加窗DFT得到精确的电网频率，然后采用加窗的递推DFT，动态调整采样频率，以实时跟踪电网频率。MATLAB仿真结果证实了此算法的有效性。
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| 关 键 词： | 谐波分析 加窗递推DFT 自适应采样 频率跟踪 |
| 文章编号： | 1001-1390(2006)11-0006-04 |
| 收稿时间： | 2006-08-31 |
| 修稿时间： | 2006年8月31日 |
A Precise Real Time Frequency Tracking Algorithm in the Power System Based on the Improved DFT Algorithm |
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| LIU Feng-xin,KONG Fan-zheng.A Precise Real Time Frequency Tracking Algorithm in the Power System Based on the Improved DFT Algorithm[J].Electrical Measurement & Instrumentation,2006,43(11):6-9. |
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| Authors: | LIU Feng-xin KONG Fan-zheng |
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| Affiliation: | College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China |
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| Abstract: | There are difficulties in performing synchronized sampling and integral period truncation in the harmonic analysis of power system with the Discrete Fourier Transform, so the results of harmonic analysis will be seriously disturbed by the spectrum leakage. An adaptive sampling frequency tracking algorithm which adapt to realization of precise real time harmonic analysis is introduced. This algorithm adopts DFT based on window function to achieve the precise power system frequency,then uses the recursive algorithm of DFT based on window function dynamically adjusts sampling interval to track after the power system frequency. Matlab simulation shows the efficiency of the algorithm. |
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| Keywords: | harmonic analysis DFT based on window function adaptive sampling frequency tracking |
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