Dario Petri - Academia.edu (original) (raw)

Papers by Dario Petri

2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

Rapid Voltage Changes (RVCs) are small, but frequent RMS voltage transitions between two steady-s... more Rapid Voltage Changes (RVCs) are small, but frequent RMS voltage transitions between two steady-state conditions, which can significantly affect the Power Quality (PQ) (particularly flicker) perceived by final users. Even if the IEC Standard 61000-4-30:2015 explicitly includes a proper RVC definition as well as a detection algorithm, the characterization of this kind of PQ events is still quite unexplored in the scientific literature. In this paper, the root mean square (RMS) voltage estimator adopted in the IEC detection algorithm is compared with a weighted least square (WLS) estimator originally conceived for Phasor Measurement Units (PMUs) and able to track voltage variations within each observation intervals. Multiple simulation results show that the WLS technique generally ensures faster RVC event detection and it is accurate even in the presence of harmonic distortion.

Digital Signal Processing

2022 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

2017 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2017

In the last edition of the IEC Standard 61000-4-30 a Rapid Voltage Change (RVC) is defined as “a ... more In the last edition of the IEC Standard 61000-4-30 a Rapid Voltage Change (RVC) is defined as “a quick transition in RMS voltage between two steady-state conditions, during which the voltage does not exceed the dip/swell thresholds [1].” Because of their intrinsically sudden nature, RVC-like events are generally hard to detect and to monitor. In fact, no clear criteria to set the detection thresholds are defined at the moment. Certainly, threshold selection should take into consideration measurement uncertainty. In this respect, in this paper the uncertainty of the classic RMS estimator suggested in the IEC Standard 61000-4-30:2015 during an RVC event is evaluated both analytically and through simulations. The presented analysis paves the way to reasonable criteria (and limits) to detect RVC-like events in realistic scenarios.

IEEE Instrumentation & Measurement Magazine, 2021

2021 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2021

In this paper the Parabolic Interpolated Discrete-Time Fourier Transform (PIpDTFT) algorithm prop... more In this paper the Parabolic Interpolated Discrete-Time Fourier Transform (PIpDTFT) algorithm proposed for the frequency estimation of a complex-valued sine-wave is extended to signal weighted by a Maximum Sidelobe Decay (MSD) window and its accuracy is analyzed. A criterion is proposed that enables the determination of the maximum distance between the DTFT interpolation points that ensures a negligible estimator bias. Also, the accuracy of the PIpDTFT frequency estimator is analyzed as a function of the accuracy of the used initial frequency estimate. Moreover, the robustness of the PIpDTFT frequency estimator to the spurious tones is investigated and compared with those of different state-of-the-art frequency estimators through computer simulations.

Digital Signal Processing, 2018

IFAC Proceedings Volumes, 1994

Digital Signal Processing, 2016

This paper deals with a new design criterion aimed at keeping the decisional risks associated to ... more This paper deals with a new design criterion aimed at keeping the decisional risks associated to conformance testing procedures below given target values. The proposed approach is based on two closed-form analytical expressions describing the dependence of both the consumer's risk (CR) and the producer's risk (PR) on three essential parameters for conformance testing, i.e. the process capability index (CI), the test uncertainty ratio (TUR) and the gauging to tolerance interval ratio (GTR). Such approximate expressions are not only very accurate, but also much less computationally demanding than the implicit, integration-based expressions of CR and PR. This assures faster results and less numerical problems when the values of TUR and GTR meeting the wanted CR and PR requirements are determined.

Digital Signal Processing, 2014

2014 11th International Symposium on Electronics and Telecommunications (ISETC), 2014

In this paper two iterative interpolation algorithms proposed in the scientific literature for es... more In this paper two iterative interpolation algorithms proposed in the scientific literature for estimating the frequency of complex-valued sine-waves are generalized to a generic Maximum Sidelobe Decay (MSD) window in order to achieve highly accurate estimates even when real-valued pure or harmonically distorted sine-waves are analyzed. The analytical expressions for the frequency estimations formulas are derived. Moreover the accuracy achieved when pure, noisy, and noisy and harmonically distorted sine-waves are analyzed is compared with those provided by the classical Interpolated Discrete Fourier Transform (IpDFT) and three-point IpDFT algorithms through computer simulations. The performed comparison allows us to determine in which situations the proposed algorithms can be advantageously used.

AEIT Annual Conference 2013, 2013

ABSTRACT In the near future, Phasor Meaurement Units (PMUs) are expected to play a key role not o... more ABSTRACT In the near future, Phasor Meaurement Units (PMUs) are expected to play a key role not only in power transmission networks, but also to monitor power flows within distribution networks. Unfortunately, in order to face the challenges of next-generation smart grids, faster and more accurate techniques have to be developed for measuring waveform phasors, fundamental frequencies and rate of change of such frequencies (ROCOF). While the Standard IEEE C37.118.1-2011 defines clear accuracy and responsiveness boundaries for synchophasor estimation under the effect of different type of disturbances, the proposed limits have sometimes been considered as inadequate for distribution networks (either too strict or too loose). In this paper, after a brief overview of the general PMU architecture, the performance of two classes of phasor estimators (i.e. based on Discrete Fourier Transform and Least Squares optimization, respectively) are shortly, but effectively analyzed and compared both in steady-state and transient conditions.

In this paper; the authors address the prob- lem of characterizing and analyzing power systems un... more In this paper; the authors address the prob- lem of characterizing and analyzing power systems un- der non-sinusoidal conditions. A method is presented that allows the estimation of relevant parameters of the spectral components in which the signals can be decomposed, via an FFT-based procedure. The results are compared with those provided by procedures pro- posed in the literature and information is given for al- lowing a straightforward application of the algorithm.

IEEE Transactions on Instrumentation and Measurement, 2000

IEEE Transactions on Instrumentation and Measurement, 2006

Modern Measurements, 2015

The system of measurement units is a subject with a highly conventional content, susceptible to c... more The system of measurement units is a subject with a highly conventional content, susceptible to changes with the technological evolution, and with legislative implications, which compel to express relations and definitions in words. This chapter considers the structure and general features of a coherent unit system, such as Systeme International d'unites (SI) from a general theoretical point of view. It then analyzes the SI in detail and also considers the basic units in their formal and most substantial aspects, looking for the underlying mathematical relations beyond the wording of definitions. The chapter outlines the perspective of short-term evolution of the system. It addresses the role of the standards and the problem of realizing a measurement unit and describes that its solution is applied to the basic and other important units to obtain the primary standards and the unit dissemination.

IEEE Transactions on Instrumentation and Measurement, 2010