The increasing use of power electronic devices in power systems has been producing significant harmonic distortions, what can cause problems to computers and microproces‐ sor based devices, thermal stresses to electric equipments, harmonic resonances, as well as aging and derating to electrical machines and power transformers [1–3]. The most impor‐ tant problems that have been reported in the l...

Experimental investigation of a speech enhancement algorithm is presented. The algorithm is designed for a spherical microphone array, and formulated in the spherical harmonics domain, based on a plane-wave model that is also formulated in the spherical harmonics domain. The proposed algorithm facilitates dereverberation by employing DOA estimation, rather that room impulse response identificat...

Accurate computation of harmonics is really a challenging problem in power system. Many algorithms have been proposed for harmonic estimation. In this paper a novel hybrid approach is proposed to estimate the amplitudes and phases of fundamental, third and fifth harmonics of three different types of distorted power signals in presence of white noise. A robust estimator known as H∞ Filter is use...

A powerful pitch estimation algorithm called SWIPE has been developed for processing speech and music. SWIPE is shown to outperform existing algorithms on several publicly available speech and musical instrument databases, and a disordered speech database, reducing the gross error rate by 40%, relative to the best competing algorithm. In short, SWIPE estimates the pitch as the fundamental frequ...

This paper proposes a three-level discrete Fourier transform (DFT) method to provide an accurate estimate of power system frequency in real time. The first level decomposes a power system signal into two orthogonal cosineand sine-filtered signals. The second and third levels are used to determine the amplitude ratio of the cosineand sine-filtered signals without encountering the zero-crossing p...

In this paper, we propose a simple and effective algorithm for frequency estimation and tracking under a harmonic frequency environment. The proposed filter structure contains only one adaptive coefficient and is very efficient for tracking the fundamental frequency of the periodical signal. Index terms Adaptive IIR Notch filter, harmonics, frequency estimation

This paper proposes a novel extended electromotive force (EEMF) observer of dual three-phase permanent magnet synchronous motor (DTP-PMSM) operable to the position sensorless overmodulation drive. The drive occurs in current harmonics, and estimated EEMF also contains harmonic components, leading ripple error position. Based on vector space decomposition (VSD) utilized DTP-PMSM control, propose...

The increasing use of non-linear loads may cause harmonics and interharmonics components in power system signals. methods used for estimating these must consider different requirements practical applications, such as low error rate, robustness to noise fundamental frequency deviation, needlessness previous knowledge the model order, short execution time. This work proposes a new algorithm calle...