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This article focuses on several specific issues with the algorithms of modern static meters to correctly measure active power and to register energy in three phase networks with mixed generation and consumption metered simultaneously. It specifically focuses on the still vague definitions of methods to evaluate positive and negative components of the calculated three phase active power from the measured...
This study is a review of traditional and non-traditional electric power theories. Along with the standard IEEE 1459-2010, other definitions like the currents’ physical components theory, p–q, p–q–r theories are briefly described with the accent on analysis of a priori unknown electric systems. The mathematical definitions were implemented and tested on real measured data, which facilitates the uncovering...
The paper exposes the topic of LED lighting systems flicker. The topic of extra low voltage LED lamps flicker has not been much discussed yet. A variety of commercially available extra low voltage (ELV) lamps were tested with respect to the light flicker produced when powered by nominal DC voltage. The same measurement is repeated with distorted and fluctuating voltage. Reverse engineering methods...
The article touches the topic of processing the measurements of high frequency harmonics in power grids (above 2 kHz). Measurements in wider band do produce large volumes of data. But often not all of these need to be stored in their raw form for further analysis. This article discusses some adaptable possibilities of reducing the amount of data and proposes an intelligent magnitude-oriented scheme...
This article describes and compares two methods of frequency measurement used in power monitoring devices. First method uses hardware zero crossing detector and every 10 second computes frequency from real interval duration and count of zero crossing. It uses simple and limited software phase-locked loop. Second method uses fully software based solution. Input data are filtered with IIR filter, zero...
This paper describes design and testing of bioelectrical measurement by capacity electrodes. The advantage of this measurement type lies in an indirect-contact between the electrode surface and skin and movement artifact protection. The measurement is easier and more comfortable since capacitively coupled electrodes eliminate the need for conductive gel and direct skin contact with the electrodes...
In our work we have focused on studying various definitions of electric power in complex situations. We have created a set of analytical tools to calculate power components according to the IEEE 1459-2010 standard and the Current's Physical Components theory. We use these tools for offline analysis of real measured data. Used data include steady states as well as transients of several common appliances,...
The article concludes on various options for lossless compression algorithms (LCA) of archives of smart grid or power quality data series — the main archive aggregated from a typical continuous monitoring — which contains huge amount of different quantity readings. We have benchmarked a range of available LCA and we proposed the LZMA algorithm as a best performing one. In this article we also describe...
In this paper we are presenting behaviour of various encodings and lossless compression methods for data stores of power quality measuring campaigns and the achieved results with different generated and real datasets. The main purpose of this work is to ease the selection of an optimal encoding for a typical power quality data in the measuring device. The most important criteria for selecting of an...
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