The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The paper describes voltage dips detection method in cases of grid-tie inverter systems. A newly developed harmonic estimation algorithm, Reduced FFT (RFFT), has been applied. The grid-tie inverter system has been modelled and simulated in the Matlab/SimPowerSystems environment. Laboratory experiment was carried out with dSPACE control hardware. The voltage dips were produced by grid emulator. For...
The motor speed of an induction machine can be accurately estimated by utilizing speed-dependent harmonics in the stator current. This paper presents a PLL-based approach to identify one of these harmonics and reduce bandwidth-limiting filtering operations. Experimental results show the ability for tracking dynamic speed transitions.
This paper considers the design and analysis of distributed multiple spherical arrays for acoustic source localization. The proposed multiple spherical array structures are based on the spherical harmonic multiple signal classification (MUSIC) algorithm for multiple acoustic sources localization. The new structures consist of several identical spheres with uniform placement of microphones on each...
Due to the simplicity and flexibility of the structure of the Second-Order Generalized Integrator based Quadrature Signal Generator (SOGI-QSG), it has been widely used over the past decade for many applications such as frequency estimation, grid synchronization, and harmonic extraction. However, the SOGI-QSG will produce errors when its input signal contains a dc component or harmonic components with...
The present work discusses the issues of epoch extraction from expressive speech signals. Epochs represent the accurate glottal closure instants in voiced speech which in turn give the accurate instants of maximum excitation of the vocal tract. Even though, there are many existing methods for epoch extraction, which provide near perfect epoch estimation from clean or neutral speech, these methods...
In the field of permanent magnet synchronous motor (PMSM) self-sensing control, the initial rotor position estimation is always important, for which, the rotor magnetic polarity estimation is particularly a major task. This paper presents a robust rotor polarity estimation method based on the comprehensive utility of both magnetic saturation effect and rotor angular acceleration. The method can be...
This contribution explores the possibility of improving the global efficiency of three-phase inverter-based distributed resources (DR) embedded in low-voltage (LV) distribution feeders, by the adaptation of their switching frequency (SF) to the operation point of both the converter and local loads. The core of this proposal lies on the fact that in a good number of applications, in both services and...
This paper presents a novel algorithm for in situ efficiency estimation for induction motors operating with distorted unbalanced voltages. The proposed technique utilizes the genetic algorithm, IEEE Form F2-Method F1 calculations, large motor test database and a new stray-load loss formula. The technique is evaluated by testing 3 small- and medium-sized induction motors with 11 different combinations...
Chroma features are a popular tool in musical signal processing and information retrieval tasks, providing a compact representation of the tonal content of a piece of music. A variety of approaches to chroma estimation have been proposed, most of which rely on the summation of related frequency partials. However, frequency partials may be incorrectly assigned due to the log/linear relationship of...
In this paper, a method for multi-pitch estimation of single-channel mixtures of harmonic signals is presented. Using the method, it is possible to resolve amplitudes of overlapping harmonics, which is otherwise an ill-posed problem. The method is based on the extended invariance principle (EXIP), and a codebook consisting of realistic amplitude vectors. A nonlinear least squares (NLS) cost function...
In this work, we consider the problem of multi-pitch estimation using sparse heuristics and convex modeling. In general, this is a difficult non-linear optimization problem, as the frequencies belonging to one pitch often overlap the frequencies belonging to other pitches, thereby causing ambiguity between pitches with similar frequency content. The problem is further complicated by the fact that...
We present a novel algorithm for rapid and efficient estimation of the fundamental frequency, phase and amplitude of harmonically distorted signals in balanced three-phase (3PH) power systems. The proposed algorithm exploits the harmonic structure of the signal to enhance the quality of the parameter estimates. It operates in the frequency domain, employing an efficient iterative interpolation procedure...
The design of a tremor estimator is an important part of designing mechanical tremor suppression orthoses. A number of tremor estimators have been developed and applied with the assumption that tremor is a mono-frequency signal. However, recent experimental studies have shown that Parkinsonian tremor consists of multiple frequencies, and that the second and third harmonics make a large contribution...
Heart rate (HR) monitoring is necessary for daily healthcare. Wrist-type photoplethsmography (PPG) is a convenient and non-invasive technique for HR monitoring. However, motion artifacts (MA) caused by subjects' movements can extremely interfere the results of HR monitoring. In this paper, we propose a high accuracy method using motion decision, singular spectrum analysis (SSA) and spectral peak searching...
Multipitch estimation, also known as multiple fundamental frequency (Fo) estimation, is an important part of the Music Information Retrieval (MIR) field. The usual approach to this problem consists of two basic steps — transforming the source sound signal from time domain to a different form and using a certain method of analysis to obtain the frequencies of musical notes recognized in the signal...
The purpose of this paper is to present a practical dynamic model of fiber optic gyro (FOG). In terms of the sampled data, theoretically and practically provide the optimal engineering solutions. Based on ARMA(p, q) modeling, engineering application methods can be ameliorated. By segmenting the composition in the form of signals, the model is more reasonable and reliable. Approach mentioned in the...
This paper presents a method to estimate the loads on a distribution feeder in real-time with limited real-time customer load data from AMI. The method consists of two modules: a load clustering module and a load modeling module. Load clustering helps to identify customer loads with similar profiles thereby helping to determine the subset of customers that need to be monitored in real-time. The load...
The problem of off-nominal frequency estimation in unbalanced three-phase power systems is addressed from the frequency domain perspective. It is first established that the original Smart discrete Fourier transform (SDFT) technique designed for real-valued single-phase voltage can be extended to deal with complex-valued αβ transformed voltage. By observing that the underlying time series relationship...
Harmonic resonance, which is a main concern in power quality, may cause damage of equipments in power system, and consequently affect stable operation of power grid. In addition, with the continued growth of distributed generators and controllable FACTS devices,for example SVCs, in power grid, harmonic resonance becomes more complicated as frequent changes of their equivalent harmonic impedance parameters...
The paper is focused on systematic research results of synchronous spectral analysis method of stationary random signals. It considers basic algorithms, apply limitations and computational complexity; introduces comparison with currently used periodogram methods.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.