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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. Source


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. Source


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. Source


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
International Journal of Electrical Power and Energy Systems | Year: 2014

In this article, some important issues associated to the dynamic response of a microgrid system are addressed. In particular, issues related to the pre-planned islanding mode of operation, load shedding, loss of one generator and the failure to shed an unforeseen connected load are studied. In this context, the dynamic behavior results of a Doubly-Fed Induction Generator (DFIG) and two other synchronous sources (a diesel and a small hydro-generator) within a microgrid, are presented. The overloading condition can occur due to causes ranging from poor load schedule, inadequate switching of circuits within the microgrid, illegal connection of load by some low voltage consumers, etc. In most of the simulated conditions the microgrid generators resumed their operation after clearing the disturbance. However, under some critical conditions, like in the case of a considerably large load connected, the microgrid was unable to return to the pre-fault condition and even failed while trying to gain stability for this new load condition. Because microgrid systems normally have low equivalent inertia, it was also observed that very little to practically no overload can be accepted by the generators. © 2014 Elsevier Ltd. All rights reserved. Source


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. Source

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