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In the paper the authors propose the improvement of three new power quality indexes presented in a previous work (De Capua, 2004) for exhaustively detecting voltage sags. In fact, during the indices' experimental assessment, some weak points of the previous presented indices have arisen. After indices' correction, ANOVA analysis have been performed, in order to investigate indices' sensibility with...
Power quality instrumentation requires the accurate fundamental frequency estimation and the signal synchronization, even in presence of disturbances. In the paper the authors present an innovative synchronization technique, based on a single phase software PLL. To evaluate how the synchronization technique is adversely affected by the application of stationary and transient disturbing influences,...
This paper describes a network architecture to remotely monitor and control complex power generation plants. Such architecture was designed as a sequence of independent blocks, in order to allow the interchangeability among elements belonging to the same block type. The resulting systems can be adapted to the particular plant, the available communication media and the sustainable costs. The architecture...
An algorithm based on the concept of adaptive notch filter (ANF) is proposed for estimation of power system frequency. The ANF is a second-order notch filter that is further furnished with a nonlinear differential equation to update the frequency. Performance of the algorithm is compared with that of a newly introduced algorithm which is based on using an enhanced phase-locked loop (PLL) system. Unlike...
In this paper the authors present a PC-based instrument for the measurement of the electric power quantities defined in IEEE Std 1459, both for single phase and three phase systems. The instrument is based on a time domain technique for the detection of fundamental and harmonic components of voltages and currents. The time domain strategy is developed for both single phase and four wires three phase...
Different techniques have been recently proposed in the literature for the identification of the sources of harmonic distortion in electric distribution systems. Each of them has its own advantages and limitations as far as reliability, accuracy and practical usability are concerned. In this paper, these techniques are grouped into three main fundamental criteria, in order to investigate their metrological...
This paper deals with a traveling standard that has been specifically designed for calibrating distributed measuring systems. A core architecture is firstly proposed that provides the basic functionalities that are necessary to perform the calibration of such kind of systems. These basic functionalities are networking and processing capabilities that allow a traveling standard to be remotely controlled,...
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