MODEL STUDY ON COMPLEX MODULATION AND DEMODULATION OF POWER NETWORK VOLTAGE SIGNAL LOADED WITH TIME-VARIABLE IMPEDANCE
Journal Title: Metrology and Measurement Systems - Year 2005, Vol 12, Issue 3
Abstract
Variability of power network voltage degrades the quality of power supplied to customers. Several power quality measures connected with voltage variability have been agreed on international scale. However, it turns out that the measures of electric power quality determined by the instruments which measure the short-term flicker severity index PST of light sources may lead to ambiguous quality assessment because of different measurement values for the same measured signals. Physical interpretation of phenomenons occurring in power network based on measurement results is therefore difficult. In this article we propose the conception of carrying this kind of analysis using a mathematical model of influence of load variability on power network voltage signal. These analyses rely on detecting factors influencing the signal shape. The article presents part of results including model studies. Presented results may be, in our opinion, basis for reasonable questioning of correctness, and especially ambiguity of currently used method for measuring time-variability of power network voltage parameters, based on determining flicker severity index. Especially doubtful are the flicker severity index definition and method of calibrating measurement devices based on it. Considering achieved results, we express the opinion about need for a new, more reliable and unambiguous measure of power network voltage variability caused by load fluctuations. It should consider signal properties, have simple physical interpretation and be simple to calculate.
Authors and Affiliations
ANDRZEJ BIEŃ, MICHAŁ SZYPER
Keywords
Related Articles
- EP ID EP144608
- DOI -
- Views 68
- Downloads 0
INTERRUPTER VALVE KINEMATICS IN THE ISSUES OF PARAMETER ESTIMATION OF THE RESPIRATORY SYSTEM MODEL
The latest papers have been suggesting that the dynamics of transient state should be taken into account as the phenomena which occur in a respiratory system are interpreted (quantitatively and qualitatively). The influe...
ANALYSIS OF THE IRREGULARLY SAMPLED SIGNALS ABOVE THE NYQUIST LIMIT
A new method of spectrum analysis of the nonuniformly sampled data above the Nyquist limit is proposed, which is based on the digital spectral shift to the baseband, optional filtering and the subsequent spectrum analysi...
DATA FUSION APPLICATIONS IN THE TRAFFIC PARAMETERS MEASUREMENT
In the paper the problem of measuring road traffic parameters using systems with complex algorithms for measurement data processing is discussed. A characteristic feature of these systems is utilising there data fusion m...
RANKINGS AS ORDINAL SCALE MEASUREMENT RESULTS
Rankings (or preference relations, or weak orders) are sometimes considered to be non-empirical, non-objective, low-informative and, in principle, are not worthy to be titled measurements. A purpose of the paper is to de...
THE IMPACT OF THE RANDOMIZATION OF THE QUANTIZATION ERROR ON THE ACCURACY OF MEASURING SYSTEMS APPLYING A DIGITAL MEASURING ALGORITHM
In measuring systems applying a digital measuring algorithm, the measurement process is divided into two stages: Stage 1 consists in the acquisition and storage of the system's input data, based on which the value of the...