Paolo Castello | University of Cagliari (original) (raw)

Papers by Paolo Castello

2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings, 2012

This paper proposes a modified version of the synchrophasor estimation algorithm which uses the n... more This paper proposes a modified version of the synchrophasor estimation algorithm which uses the non-orthogonal transform defined as a Taylor-Fourier Transform (TFT) and which is based on a Weighted Least Squares (WLS) approximation respect to a second order of Taylor model. The aim of the proposed changes is to improve the performance of the algorithm in presence of fast transient

2014 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings, 2014

Protection and measurement systems in electrical substations are requested to have high availabil... more Protection and measurement systems in electrical substations are requested to have high availability. When considering an all-digital substation protection system, all the components and infrastructure devices (instrument transformers, processing units, merging units, intelligent electronic devices, communication network and synchronization source) contribute to the overall availability level. In particular, in this paper the availability of a distributed phasor measurement unit inspired by the standards IEC 61850, is investigated. A cost-effective solution to enhance distributed PMU reliability by means of redundancy using an IEEE 802.11 wireless network is proposed. The process bus has a wireless backup for both time synchronization protocol and sampled values packets carrying measurement information. Results are reported for a wireless network that uses software based timestamping for PTP synchronization.

IEEE Transactions on Instrumentation and Measurement, 2014

ABSTRACT The IEEE Standard C37.118.1 defines two performance classes, P and M, for phasor measure... more ABSTRACT The IEEE Standard C37.118.1 defines two performance classes, P and M, for phasor measurement units (PMUs), respectively for protection and monitoring oriented applications. The goal of this paper is to define an algorithm that allows the requirements of both classes to be met simultaneously, thus avoiding an a priori selection of either the fast response time of class P or the accuracy of the class M. The designed PMU consists of two digital channels that process in parallel the acquired samples with different algorithms: the first one allows accurate measurements of steady state signals, while the second one is better suited to follow the fast signal changes. Then, a detector identifies the possible presence of dynamic situations and selects the most appropriate output for the actual operating condition. The validation of the solution, performed by means of simulations in all the static and dynamic conditions defined in the standard, confirms that the method is able to comply with all the limits indicated for both classes for synchrophasor and frequency measurement. As for the rate of change of frequency, again the compliance to P-class is fully verified, while for the M-class the only exception is represented by the tests with out-of-band disturbances.

IEEE Transactions on Instrumentation and Measurement, 2000

Phasor measurement units (PMUs) are becoming one of the key issues of power network monitoring. T... more Phasor measurement units (PMUs) are becoming one of the key issues of power network monitoring. They have to be able to perform accurate estimations of quantities of interest either under steady-state or transient conditions. Among all the sources which may contribute to the uncertainty introduced by PMUs, this paper analyzes the impact of the phasor estimation models on the accuracy of these devices, focuses on algorithms proposed in the literature for the estimation of dynamic phasors, and studies their performances under several different conditions.

Applied Measurements for …, Jan 1, 2011

Abstract Synchrophasor measurement is becoming one of the key issue of power network monitoring. ... more Abstract Synchrophasor measurement is becoming one of the key issue of power network monitoring. The actual standard IEEE C37. 118 concentrates on phasor estimation requirements under steady state conditions. The standardization process is going towards a complete framework that keeps into account dynamic conditions. This paper focuses on algorithms proposed in literature for the estimation of dynamic phasors and analyzes their performance under several different conditions.