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首页> 外文期刊>Electric power systems research >New Quick-convergence Invariant Digital Filter For Phasor Estimation
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New Quick-convergence Invariant Digital Filter For Phasor Estimation

机译：用于相量估计的新型快速收敛不变数字滤波器

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摘要

Digital filters are used, among other purposes, for estimating the harmonic components of a signal. It is important that this estimation should take into account transient periods generated when a change in signal state occurs, e.g. when a fault occurs in an electrical system.rnPhasor estimation in electrical systems faces several problems that need to be solved. One of these problems is signal distortion occurring under short-circuit conditions. The resulting signal may contain, along with the fundamental component, a number of harmonics and a decaying dc-offset. Also, to allow this estimation to be performed in real time, some algorithms are needed to keep a proper balance between the accuracy of results and the computational load required for its application.rnThis paper presents the design of a new digital filter, CharmDF (Characteristic Harmonic Digital Filter), incorporating a treatment of samples prior to applying the Discrete Fourier Transform (DFT) filter. The application of the method proposed remains the same in the face of any signal change. Moreover, the convergence of the response provided by the algorithm developed when a change in signal state occurs is significantly improved. For this reason, the method proposed is suitable for use in real time estimations, such as on electrical protection devices.
机译：除其他目的外，数字滤波器还用于估计信号的谐波分量。重要的是，此估计应考虑到发生信号状态变化（例如，信号状态变化）时产生的瞬态周期。当电气系统发生故障时。电气系统中的相量估计面临一些需要解决的问题。这些问题之一是在短路条件下发生信号失真。所得的信号可能包含基本成分，许多谐波和一个衰减的直流偏移。同样，为了使这种估计能够实时执行，需要一些算法来在结果的准确性和其应用所需的计算负荷之间保持适当的平衡。rn本文提出了一种新型数字滤波器的设计，CharmDF（Characteristic谐波数字滤波器），在应用离散傅立叶变换（DFT）滤波器之前，先对样品进行处理。面对任何信号变化，建议的方法的应用都保持不变。此外，当信号状态发生变化时，由开发的算法提供的响应的收敛性得到显着改善。因此，提出的方法适用于实时估计，例如在电气保护设备上。

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