FDTE Foundation for the Technological Development of the Engineering Sciences

Sao Paulo, Brazil

FDTE Foundation for the Technological Development of the Engineering Sciences

Sao Paulo, Brazil

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Crispino F.,FDTE Foundation for the Technological Development of the Engineering Sciences | Ogiboski L.,University of Sao Paulo | Murakami L.A.,CTEEP | Magrini L.C.,FDTE Foundation for the Technological Development of the Engineering Sciences
Proceedings of the 2012 6th IEEE/PES Transmission and Distribution: Latin America Conference and Exposition, T and D-LA 2012 | Year: 2012

This paper presents the development of a management system for teleprotection commands in order to evaluate its operating conditions. It was developed a data acquisition system from teleprotection equipments as well as data from protective relays. The system collects data cyclically and automatically or also on occurrence of teleprotection events. The data are analyzed by statistical techniques to observe tendencies in behavior. This system results in an improvement in the maintenance and also in the reliability of teleprotection. Based on current and historical information provided by the system, preventive maintenance can be postponed or performed in most appropriate time interval. © 2012 IEEE.


Ogiboski L.,University of Sao Paulo | Alberto Bravo Pariente C.,State University of Santa Cruz | Carlos Magrini L.,FDTE Foundation for the Technological Development of the Engineering Sciences | Antonio Jardini J.,University of Sao Paulo
IEEE Latin America Transactions | Year: 2013

This paper presents the specification, design and development of a system for remote acquisition of analogical and digital data in power station equipments. The real-time requirements of the acquisition system are of the order of milliseconds. This requirement is important for the generation of oscillographic data from the signals which are used to diagnostic the evolution of the equipment being monitored. Besides the real time requirements, the system is able to acquire data from other sources and is compatible with the most used communications protocols in this field of application. The contribution of this work is the definition of a generic system for remote data acquisition based on open source software and low-cost hardware. In addition, the system can be used for any application requiring real-time data acquisition. © 2003-2012 IEEE.


Nicoli S.,University of Sao Paulo | Jardini J.A.,University of Sao Paulo | Magrini L.C.,FDTE Foundation for the Technological Development of the Engineering Sciences | Miranda C.D.M.,Consorcio EDP
2013 IEEE PES Conference on Innovative Smart Grid Technologies, ISGT LA 2013 | Year: 2013

This paper focuses on the use of intelligent computational methods and data mining technology applied to interpretation of measurements obtained from instruments of a hydroelectric dam that will signals the occurrence of an unusual value. This analysis is done considering the latest measurement collected and comparing this individual value with previous measurements already saved at historical database. This analysis is periodically done by an intelligent algorithm that produces a warning report if the latest value collected from the instrument is not compatible with the historical behavior learned from the past measurements. A modified HOT SAX algorithm is proposed for this analysis since this method was originally conceived for a fixed size time series and not for continuous data acquisition. © 2013 IEEE.


Del Carpio-Huayllas T.E.,University of Sao Paulo | Ramos D.S.,University of Sao Paulo | Vasquez-Arnez R.L.,FDTE Foundation for the Technological Development of the Engineering Sciences
Proceedings of the 2012 6th IEEE/PES Transmission and Distribution: Latin America Conference and Exposition, T and D-LA 2012 | Year: 2012

The objective of this paper is to present an evaluation related to the possible application of the Feed-in and Net metering tariffs into microgrid systems. Microgrid systems are currently among the options considered to support the network especially during periods of blackout. Critical loads in various areas (e.g. military bases, health centers, nuclear installations, etc) operate already under a microgrid scheme. However, an important issue still to be sorted out is the way that it will negotiate its surplus energy when connected to the utility. This article will show that the application of the main incentive policies and clean energy tariffs currently available will need some adaptations if they are to be applied on microgrid systems. © 2012 IEEE.


Del Carpio-Huayllas T.E.,University of Sao Paulo | Ramos D.S.,University of Sao Paulo | Vasquez-Arnez R.L.,FDTE Foundation for the Technological Development of the Engineering Sciences
Proceedings of the IEEE Power Engineering Society Transmission and Distribution Conference | Year: 2012

The objective of this paper is to present the results of the simulations conducted regarding the grid connected and islanded modes of operation of a test case microgrid. Such results are related to the pre-planned or intentional islanding and the forced islanding condition. Currently, the expectation about the performance of the microgrid technology is high, thus, more research is needed to guarantee that the different conditions that might be present in a real case are those shown in the simulations. It will be shown that the microgrid can face some difficulties, even unsuccessful attempts, during its islanding procedure from the utility. The Matlab/Simulink program was used as simulation tool. © 2012 IEEE.


Dos Santos M.L.,University of Sao Paulo | Jardini J.A.,University of Sao Paulo | Casolari R.P.,FDTE Foundation for the Technological Development of the Engineering Sciences | Vasquez-Arnez R.L.,FDTE Foundation for the Technological Development of the Engineering Sciences | And 3 more authors.
IEEE Transactions on Power Delivery | Year: 2014

In this paper, the economics of some alternative solutions for point-to-point transmission of bulk power over long distances, namely, HVDC and half-wavelength lines (HWLL), are evaluated. Also, the main technical aspects of the half-wave length transmission technology in order to define the line design and its required equipment are discussed. A two-line, 2500 km transmission system (which is half the wavelength of a 60 Hz power frequency) carrying 6000 MW is used as the base case to perform the comparison. Finally, issues related to the sensitivity of such a cost comparison between the HVDC and HWLL alternative is presented. © 1986-2012 IEEE.


Vasquez-Arnez R.L.,FDTE Foundation for the Technological Development of the Engineering Sciences | Ramos D.S.,University of Sao Paulo | Del Carpio-Huayllas T.E.,University of Sao Paulo
Lecture Notes in Engineering and Computer Science | Year: 2013

This paper presents the simulation results and analysis related to the response of a microgrid system, specifically the generators inside the microgrid, towards an accidental overload condition that will require some load shedding action. A microgrid overload can occur due to various reasons ranging from poor load schedule, inadequate switching of circuits within the microgrid, outage of one or more generators inside the microgrid, illegal load connections by some low voltage consumers, etc. It was observed that among the main factors that determine the survival of the microgrid during its transition from the grid connected mode to the islanded mode of operation are the size and type of the load connected (passive or dynamic load), the length of time that the unexpected load is connected as well as the provision of speed and voltage regulators to the generators.


Vasquez-Arnez R.L.,FDTE Foundation for the Technological Development of the Engineering Sciences | Jardini J.A.,University of Sao Paulo | Bassini M.T.,University of Sao Paulo
Przeglad Elektrotechniczny | Year: 2015

In this article, the modelling and simulation results related to the dynamic performance of a multiterminal HVDC system, based on Line Commutated Converters (LCC), is presented. The four-converter HVDC system simulated operates at 500 kV. In order to evaluate its behaviour in a more realistic way, the multiterminal HVDC system was embedded into an equivalent ac network that resembles an existing high voltage system. A model to represent the ac generator dynamics (speed regulator and voltage controller), which interacts with the DC system, is also presented in the paper. The converter blocking condition, which is another HVDC operative requirement, was also simulated. From the dynamic response of the converters and ac sources obtained, it can be stated that the LCC-based multiterminal HVDC system can be a good alternative to be considered while analysing issues like planning, expansion and transmission of bulk power. © 2015, Kluwer Academic Publishers. All Rights Reserved.


Vasquez-Arnez R.L.,FDTE Foundation for the Technological Development of the Engineering Sciences | Masuda M.,FDTE Foundation for the Technological Development of the Engineering Sciences | Jardini J.A.,University of Sao Paulo | Kaiser W.,University of Sao Paulo | Nicodem E.J.V.,Eletrosul Centrais Eletricas S.A.
IEEE Transactions on Power Delivery | Year: 2012

In recent years, there was an increase of ancillary service loads, such as signaling systems, inspection robots, surveillance cameras, and other monitoring devices distributed along high-voltage transmission lines which require low-power dc voltage supplies. This paper investigates the use of the induced voltage in the shield wires of an overhead 525 kV transmission line as a primary power source. Since phase current variations throughout the day affect the induced voltage in the overhead ground wire, a step-down dc-dc converter is used after rectification of the ac voltage to provide a regulated dc output voltage. The initial encouraging results obtained indicate that this form of power supply can be a feasible and cost-effective alternative for feeding small ancillary service loads. The simulation results are validated by field measurements as well as the installation of a 200 W voltage stabilization system prototype. © 2012 IEEE.


Huayllas T.E.D.C.,University of Sao Paulo | Ramos D.S.,University of Sao Paulo | Arnez R.L.V.,FDTE Foundation for the Technological Development of the Engineering Sciences
IEEE Latin America Transactions | Year: 2014

The objective of this article is to present a comparative evaluation and analysis related to the possible application of the main incentive policies, particularly net metering and feed-in tariffs, into microgrid systems. This is done in order to promote their implementation, expansion and consequent integration to medium and low voltage systems. To complement the study carried out, it was deemed essential including the response of the simulations related to the performance of a microgrid during its islanding (pre-planned and unintentional) process from the network. Today, the expectation about the performance of microgrid systems is high, especially if it is considered that its nearest ally, the smart grid technology, is having a rapid development. From the simulations conducted to assess the microgrid dynamic response, it became clear that microgrid systems may face some difficulties including unsuccessful attempts during the islanding process from the network.

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