The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
The synchrophasor Standard IEEE C37.118.1, along with its amendment, defines two compliance classes for phasor measurement units (PMUs), the different test signals to be adopted for verification and the limits that should be respected for each test condition. In recent years, many synchrophasor estimation algorithms have been proposed to deal with the operative conditions identified by the standard,...
This paper presents the development of a system based on optical current transformers (OCTs) and optical voltage transformers (OVTs) for on-field calibration of conventional instrument transformers (ITs), avoiding necessities of removing the equipment for laboratory environment and interruption of supply for on-field calibration procedures. To accomplish these aims it was required the development...
Due to the increasing presence of renewable energies and advances in power electronics, the power systems are nowadays working with more and more disturbing sources. Increasing performances are then required to voltage and current instrument transformers, in terms of both accuracy and frequency bandwidth. With reference to these requirements, low power non-conventional instrument transformers, which...
The electricity distribution network is a critical infrastructure of the modern society. The continuity of the electricity distribution service is therefore a key topic. Network automation is aimed at improving service continuity. Among the several possible automation schemes, logic selectivity between protection relays is one of the most effective approach because it allow to reduce the area affected...
Since HVDC transmission is considered as the most favourable solution for the interconnection of several transmission grids over long distances, e.g. in offshore wind farms, the need for traceability for converter efficiency and HVDC metering has increased. Not least the economic consideration of loss distribution in such HVDC grids leads to the necessity of a metrological background for HVDC applications...
This paper aims at testing the applicability of a previously proposed diagnostic method for PEM fuel cells, which exploits the ripple produced by switch-mode converters to monitor the fuel cell state of health. A low-voltage DC/DC boost converter has been designed for this purpose, suitable to be directly connected to a single cell. This paper shows how the cell response to the converter current ripple...
Nowadays direct current (DC) is much more widely used than a decade ago. Not only in the well-known high voltage direct current (HVDC) transmission but also as DC powered marine system, DC data center and DC fast charging system for electric vehicles. DC is now challenging the alternative current (AC) in a large variety of fast growing markets. However a galvanically isolated DC voltage measurement...
Fine-grained state estimation is expected to play a key role in smart grid monitoring and control. The most common class of state estimators at both transmission and distribution level relies on the so-called Weighted Least Squares (WLS) approach. While various, well-established implementations of WLS-based state estimators exist, all solutions typically exploit redundant data to assure full state...
Large-scale grid integration of plug in Electric Vehicles (EVs) brings in many challenges and opportunities for electric power systems. Considering their relatively high power demand and flexibility in terms of charging time, EVs can offer opportunities for demand side management. In particular, the socalled EV Aggregators or Charge Optimization Systems (COS) can optimize the charging schedule of...
Phasor Measurement Units (PMUs) are being employed in power system to achieve better monitoring and control of power grid. Due to their high cost, PMUs are placed at some strategic locations. However, while upgrading a power system monitoring structure, engineers may face problem of no communication facility at a bus. PMUs need a sound communication structure so that it can perform time-synchronized...
Window-type current transformers are widely used in medium voltage switchboards for measuring the current flowing in the cables entering the board itself. Due to their operating principle, the accuracy of such kind of current transformers may vary depending on many factors, such as, for example, the position of the cable passing through the transformer with respect to the center of the window and...
The emergence of next generation WAMS and WAMPAC networks offers promising advantages for ensuring the stability of the distribution grid. Thanks to the revolutionary synchrophasor technology, the power system observability is no longer an unknown quantity. However the deployment of such systems is heavy and rigid. We implemented a mobility-oriented lightweight deployment consisting in several PMUs...
In future distribution network the need for automatic control and supervision has to be assisted by a monitoring system with high quality performance in terms of accuracy, reporting rate and robustness. However the number of measurement devices vs number of nodes buses is still very low. The increment in the measurement capacity can be achieved through distributed measurements, deploying of more devices,...
This paper proposes a fault diagnosis method for star-connected auto-transformer based 24-pulse rectifier by integrating artificial neural networks (ANN) with wavelet packet decomposition (WPD) and principal component analysis (PCA). The WPD is employed to extract the features of different fault waveforms of the output voltage of the rectifier. PCA is adopted to reduce the dimensionality of the extracted...
The need of using in the same application synchronized data received with high reporting rate (like those provided by Phasor Measurement Units, PMUs) and aggregated data from measurement equipment with a lower reporting rate (which are usually complying with power quality data aggregation standards) is raising the question of achieving compatible data for ultimately assessing relevant information...
Rapid voltage changes are a type of power quality disturbance that has not received sufficient attention in the international power quality standards. IEC 61000-4-30, Ed. 3, will introduce a precise method for their detection and analysis. This paper reviews the definitions and the international regulations on RVCs reports some of the results obtained in the measurement of RVCs in different power...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.