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In recent years supra-harmonic distortion studies are gaining attention in power quality research area. Advanced communication systems, especially Power Line Carrier (PLC) systems in frequency range 2–150 kHz, are suitable for causing electromagnetic interference (EMI) to other systems. This study shows results of analysis of interferences employing advanced method called ensemble empirical mode decomposition...
In many applications, very fast methods are required for estimating of parameters of harmonic signals distorted by noise. Most of the known digital algorithms are not fully parallel, so that the speed of processing is quite limited. In this paper new parallel algorithms are proposed, which can be implemented by analogue adaptive circuits employing some neural networks principles. Algorithms based...
This paper presents implementation of instantaneous voltage-current trajectory (I, U) and its linearization. The aim of the work is to investigate possibility of using the slope of the linearized trajectories obtained synchronously in few measurement points. Field measurement results are presented using wide-area power quality monitoring system installed in distribution network with small hydro power...
An idea of empirical mode decomposition (EMD) with Hubert Transform (HT) as well as cross-section of smoothed pseudo Wigner-Ville distribution (SPWVD) and instantaneous distortion index (IDIN) are investigated in point of detection of high frequency inrush power quality disturbances. Application and assessment of mentioned techniques are performed using disturbances recorded by wide area power quality...
This paper is a continuation of Part I [1] and presents the application of a comprehensive system of registration, archiving and data processing for the wide-area monitoring of power quality in a separated part of real power grid with distributed renewable generation. Real case studies related to tracking of disturbances' wandering and localization of sources of voltage disturbances are presented.
This paper presents the developed and built comprehensive system of registration, archiving and data processing for the wide-area monitoring of power quality in a separated part of real power grid with distributed renewable generation. Real case studies related to localization of sources of voltage disturbances are presented.
The general possibility of combining electric vehicles, PV systems and storage devices is useful for the reliability and quality of electricity distribution. It contributes to optimal operation of distribution networks and minimization of transmission losses. The potential of a microgrid concept can be evaluated using a reliable and reality oriented simulation allowing various case studies and resizing...
In many applications, very fast methods are required for estimating of amplitudes of current signals distorted by noise. In this paper new parallel algorithms are proposed, which can be implemented by analogue adaptive circuits employing selected neural networks principles. Algorithms based on the total least-squares (TLS) and the robust total least-squares (RTLS) criteria are developed and used to...
An asynchronous state of a synchronic machine may be identified through determining the amplitudes of particular components of stator's current provided that a constant slip value is assumed. Following a synchronism loss, this adopted value is assumed to be achieved and, for sure, exceeded. New parallel algorithms for detection of asynchronous state of synchronic machines, are proposed. The algorithms...
Fast determination of frequency of the fundamental waveform of voltages and currents is essential for the control and protection of electrical power systems. In this paper the advanced methods of frequency estimation of distorted signals are presented. These methods, basing on Prony's model, are useful for frequency estimation of distorted signals in real time mode. These signals appear in circuit...
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