Interpolated-DFT-Based Fast and Accurate Frequency Estimation for the Control of Power
Interpolated-DFT-Based Fast and Accurate Frequency Estimation for the Control of Power
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DOI：
10.1109/tie.2014.2316225
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发表时间：
2014-04
影响因子：
7.7
通讯作者：
J. Borkowski;D. Kania;J. Mroczka
中科院分区：
文献类型：
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作者：
J. Borkowski;D. Kania;J. Mroczka
可再生能源系统产生的能源必须满足相应标准和指令中定义的质量要求。质量的改善可以通过更准确地估计用于控制逆变器的电网信号的频率来实现。本文概述了频谱插值和频率估计的方法，以及使用快速傅立叶变换过程与最大衰减旁瓣窗口相结合的非常精确的频率网格估计的一般方法。该算法的一个重要特征是消除了与估计结果上的共轭分量相关联的影响（即，即使信号的测量时间在2.5个周期的量级上，也有可能指定频率），并且该算法的实现是直接的。仿真结果表明，该算法能够快速准确地估计电网信号频率。对于5 ms的测量窗口，系统频率估计误差约为5·10-11 Hz。该算法不仅适用于单频正弦信号，而且适用于多频信号。这是假设将执行适当的频谱泄漏减少（通过时间窗口）。
The energy produced by renewable energy systems must fulfill quality requirements as defined in the respective standards and directives. Improvement of the quality could be achieved through a more accurate estimation of the frequency of the grid's signal that is used to control an inverter. This paper presents an overview of a method for spectrum interpolation and frequency estimation, and a generalized method for very accurate frequency grid estimation using the fast Fourier transform procedure coupled with maximum decay sidelobe windows. An important feature of this algorithm is the elimination of the impact associated with the conjugate's component on the estimation's outcome (i.e, the possibility of designating the frequency even if the signal's measurement time is on the order of 2.5 periods), and the implementation of the algorithm is straightforward. The results of the simulation show that the algorithm could be successfully used for a fast and accurate estimation of the grid signal frequency. The systematic frequency estimation error is approximately 5·10-11 Hz for a 5-ms measurement window. The algorithm could be used not only for a single sinusoidal signal, but also for a multifrequency signal. This is assuming that the appropriate spectrum leakage reduction (by a time window) will be performed.