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The analytical expressions for trapezoidal and triangular signals arbitrary order q integral factors of harmonics are obtained by using the infinite series harmonic synthesis formulae. Since the only first order coefficient of the differential factors of harmonics can be calculated this way for these signals, the before offered LabVIEW virtual instrument is modified for the up to third order integral...
This paper presents a new hybrid algorithm for harmonic estimation. The algorithm combines a simple fast population based search algorithm with Least Squares Method. It is based on the structural property of the harmonic estimation problem which implies that the signal model is linear in amplitude and nonlinear in phase. The hybrid algorithm uses the search algorithm for phase estimation and LS for...
Extended Kalman filter frequency tracker converges to an optimal estimation with a very low computational complexity only if an exact knowledge about the initial state is available and the model is accurate otherwise it may diverge. On the other hand, particle filter performance is not so sensitive to the initial state estimation and results in a more robust estimation even if no prior knowledge about...
In this paper we developed algorithm for detection non-Gaussianity of the signal and noise mixture. Noise at a radar receiver input has Gaussian distribution, but mixture of noise and useful signal tends to be non-Gaussian. Thus, presence of useful echo signal in the mixture can be detected with use of the proposed algorithm. Further processing in moving target detection system allows distinguishing...
In nowadays electrical grids with distributed renewable energy generation, in microgrids and smart grids, the estimation of the fundamental frequency in a fast and precise way is essential. This paper introduces a new state-space model to be used with an Extended Kalman Filter (EKF) for estimating the frequency of power system signals in real-time. The proposed model takes into account all the characteristics...
Some new researches for non-invasive diagnostic applications, by detecting local thermal gradients on internal tissues, seeking a very-early detection of some types of cancer are a promising investigation way with high medical interest.
Spectral testing is widely used in characterizing the dynamic performance of analog signals. Achieving accurate test results is an expensive and challenging task. This paper focuses on eliminating the challenging requirement of non-coherent sampling in the presence of an impure signal with large distortion to noise ratios. A new method was proposed that iteratively estimated noncoherent fundamental...
In hardware implementation of any signal processing algorithm, computational time and hardware resources are crucial issues. This paper presents design and implementation of a new architecture of wavelet filter for power system harmonics estimation using discrete wavelet packet transform (DWPT). Usually, DWPT provides coefficients as the output, however, the proposed architecture also includes provision...
System-wide monitoring and reliable identification of power quality (PQ) events and their sources is one of the critical requirements of modern grid. Synchronized phasor measurement has helped power engineers and utilities in fast and reliable state estimation and wide area monitoring of power system. This paper proposes a fast and reliable method for estimation of synchronized harmonic phasors. In...
This paper proposes a novel method for magnetic polarity detection in pulsating current injection based self-sensing control of surface-mounted permanent-magnet synchronous motors (SPMSM). When a proper high frequency current is superimposed in d-axis, the flux linkage saturates which can lead to the distortion of the resulting voltage. With the Fourier analysis, the 2nd harmonic of the resulting...
The Second-Order Generalized Integrator (SOGI) was used as a building block for the SOGI-Quadrature-Signal Generator (SOGI-QSG) which has been widely used for grid synchronization, frequency estimation, and harmonic extraction over the past decade. This paper further investigates its integration and differentiation characteristics, with four new integrators and differentiators proposed. Theoretical...
Vocal pathologies are most of the time due to the irregular behavior of the vocal cords during phonation. This irregular vibration can be induced by benign or malign tumor on the cords and should result in irregular values of used parameters. In this paper, we present a new tool for automatic detection of pathological voice particularly laryngeal cancer. A preprocessing approach was based on the glottal...
Synchronization is a crucial aspect in grid-tied systems, including single-phase photovoltaic inverters, and it can affect the overall performance of the system. Among prior-art synchronization schemes, the Multi Harmonic Decoupling Cell Phase-Locked Loop (MHDC-PLL) presents a fast response under grid disturbances and high accuracy under harmonic distortions. However, major drawbacks of the MHDC-PLL...
This article discusses an improved method for harmonic estimation when Asynchronous Sampling Condition (ASC) is present. The method is based on previous work on a modified DFT (Discrete Fourier Transform) using a compensation of the number of samples. This paper presents the analytical derivation of a new mathematical expression using trapezoidal integration rule and compares the performance of both...
This paper proposes a multilevel shunt active power filter (SAPF) to deal with either harmonic currents compensation or reactive power compensation. Such a device can reduce the harmonic distortion at the grid currents provided by non-linear loads located in stiff systems. The proposed SAPF is based on three-phase bridge (TPB) converters connected to cascaded single-phase transformers. The transformers...
It is very important to estimate flux accurately in implementing high-performance control of AC motors. Theoretical analysis has been made to illustrate the performance of the pure-integration-based and the Low-Pass Filter (LPF) based flux estimators. A novel flux estimator based on Second-Order General Integrator (SOGI) with Frequency Locked-Loop (FLL) is investigated in this paper for induction...
Causal Heart Rate (HR) monitoring using photoplethysmographic (PPG) signals recorded from wrist during physical exercise is a challenging task because the PPG signals in this scenario are highly contaminated by artifacts caused by hand movements of the subject. This paper proposes a novel algorithm for this problem, which consists of two main blocks of Noise Suppression and Peak Selection. The Noise...
One of the most interesting application of speech processing is the identification and classification of pathological voice. Such area of research is still a challenging task. In this paper, we are interested in the severe case of the pathological voice; larynx cancer. This work concentrates on developing a feature extraction for detecting and classifying larynx cancer by investigating different glottal...
This paper deals with an enhanced phase locked loop with generalized filtering (GF-EPLL) based control algorithm for a grid interfaced solar photovoltaic (SPV) system. The interface between the SPV array and the grid is realized by a voltage source inverter (VSI). The VSI is implemented for SPV power extraction at high power quality and to feed it into the grid and load connected to it. The IC (Incremental...
This paper propose an adaptive filter based on continuous time LMS for the distribution static compensator. The Simulink model is constructed in MATLAB software of the complete system along with adaptive control algorithm and rectifier type nonlinear load. It is seen from the test results that the presented LMS adaptive filters accurately estimate the active component weight of the currents from the...
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