Sao Paulo, Brazil
Sao Paulo, Brazil

AES Eletropaulo is a major Brazilian power distributor in the state of São Paulo, created in the breakup of the old state-owned power distribution company Eletropaulo that monopolized electricity distribution in São Paulo from 1981 to 1999. The similarity of the names makes most old customers call it simply Eletropaulo.The company has around 5.8 million customers - nearly 16.3 million people - in an area of 4526 kilometers ², in 24 municipalities in the metropolitan area of São Paulo, including the city itself;Its stock is traded on BM&F Bovespa, where it is part of the Ibovespa index. The company is majority owned by AES Corporation. Wikipedia.

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Almeida C.F.M.,University of Sao Paulo | Vicentini E.,AES Eletropaulo
2015 IEEE PES Innovative Smart Grid Technologies Latin America, ISGT LATAM 2015 | Year: 2015

This paper presents a methodology and a computational tool developed for the assessment of the impacts caused by photovoltaic and wind generators, up to 100 kW, connected to the distribution networks, and aims at a real network application. The impact on the power distribution systems planning derive from the new network configuration caused by the installation of distributed generators and the demand growth. The curves associated with the distributed generators (DG) are modelled based on the average behavior of the inputs, such as irradiation and wind, and the technologies available. Their locations are defined by a DG probabilistic allocation algorithm based on attractiveness measures, as a function of economic variables. The network impacts consider prospective scenarios, and are determined by the diagnosis of network elements, by monitoring the loading of feeders and secondary networks, as well as the analysis of voltage profiles, losses, and protection effectiveness. © 2015 IEEE.

Pereira F.,Marcelo Aparecido Pelegrini Sinapsis Inovacao em Energia | Martins J.C.,AES Eletropaulo | Duarte S.X.,University of Sao Paulo
2013 IEEE PES Conference on Innovative Smart Grid Technologies, ISGT LA 2013 | Year: 2013

Some customers; like hospitals, fire departments and traffic control; have special needs related to power supply. Sooner the power outage diagnostic, sooner the maintenance and the time without energy is reduced. Power quality problems can disturb traffic semaphores controls and the utilities do not have a real-time monitoring system for the low-voltage grid. An UPS with batteries was developed, for traffic semaphores with LED lamps, with a communication channel. This equipment can supply the semaphores during power failure and can transmit self diagnostic and information about the grid status to the utility. © 2013 IEEE.

Nascimento V.C.D.,AES Eletropaulo | Lambert-Torres G.,PS Solutions | Costa C.I.D.A.,Federal University of Itajubá | Borges Da Silva L.E.,Federal University of Itajubá
Electric Power Systems Research | Year: 2015

This paper describes a model for power distribution grid simulation with distributed generation, designed to be a simulation environment of two proposed elements: (1) an algorithm to reconfigure the circuit topology to enable a microgrid during an outage of power supply, and (2) a specific limiter to allow safe operation of distributed generation in the network. Moreover, an interface of the simulation model with a SCADA was designed to suggest possible operational screens for both: the generator and the utility. The simulation model was designed with a synchronous generator with all cogeneration typical controls: speed, active power, voltage, reactive power and power factor. Thus, it is possible to simulate critical situations with all control modes available in a typical cogeneration plant in addition to the proposed limiter. Due to the immense number of possible combinations of circuit breakers in the grid, the proposed algorithm is based on genetic algorithms to enable a fast enough autonomous reconfiguration to avoid the outage perception by the customer. ©2015 Elsevier B.V. All rights reserved.

De Oliveira A.L.,FDTE | Magrini L.C.,FDTE | Kim H.Y.,University of Sao Paulo | Kviatkowski M.A.,AES Eletropaulo
2014 IEEE PES Transmission and Distribution Conference and Exposition, PES T and D-LA 2014 - Conference Proceedings | Year: 2014

One of the barriers in remote operation of circuit-switchers installed in subtransmission lines is to be aware of the actual conditions of each of the poles of the circuit-switcher, as well as confirmation of the success, or failure, of the operation. Often the visual confirmation of the maneuver is part of the procedure, requiring the displacement of the ground crew and creating schedule delays. A monitoring system was developed for circuit-switchers based on an algorithm to detect the state of the circuit-switcher, open or closed, from the digital processing of images captured after the maneuver. © 2014 IEEE.

De Oliveira A.L.,FDTE | Magrini L.C.,FDTE | Cunha C.,FDTE | Kim H.Y.,University of Sao Paulo | Kviatkowski M.A.,AES Eletropaulo
2013 IEEE PES Conference on Innovative Smart Grid Technologies, ISGT LA 2013 | Year: 2013

For the remote operation of transmission line circuit-switchers that are equipped with electric arches extinction chamber must be known the signal provided by mechanical flags that signalizes the status of SF6 gas pressure as well the state of the electrical contact inside of the chamber. This visual inspection required is costly and may generate delays, reducing the availability of the equipment. This R and D project proposed the development of a monitoring system supporting different technologies that will permit that AES Eletropaulo choose the better solution for each particular field condition. The developed system implements the automatic monitoring of the real status of mechanical flags by the use of the optical sensors, as well the state of the switch (open/closed) through position sensors and images captured e processed in the instant of the maneuver. © 2013 IEEE.

Ogiboski L.,University of Sao Paulo | Cunha A.C.,AES Eletropaulo | Kajikawa C.O.,AES Eletropaulo | Magrini L.C.,University of Sao Paulo | Jardini J.A.,University of Sao Paulo
Proceedings of the International Conference on Optimisation of Electrical and Electronic Equipment, OPTIM | Year: 2012

Gas Insulated Substations (GIS) are important equipment to power industry, mainly because of its compactness and robustness. This kind of substation uses SF 6 (sulfur hexafluoride) gas as dielectric due to its feature, but on the other hand, SF 6 is the most powerful greenhouse gas. Based on the importance of this gas to the power systems and its environmental damages, this research proposes a monitoring system to check gas quality and gas leakages in a GIS. The aim was to develop a low cost system to collect status data and record in a historical database. The latest results expose the development and installation of the acquisition e monitoring system in three bays of a GIS. With the implementation of the system is expected to improve the gas quality management and also improvements on gas leakage detection and location. © 2012 IEEE.

Magrini L.C.,FDTE | Kayano P.S.D.,FDTE | Ogiboski L.,FDTE | Goncalves F.A.,AES Eletropaulo
2013 IEEE PES Conference on Innovative Smart Grid Technologies, ISGT LA 2013 | Year: 2013

The partial discharge analysis is one of the techniques used to diagnose the insulation degradation process of various electrical components. However, characterizing these partial-discharge sources in electrical components under operation becomes difficult due to the large amount of noise and interference. This article presents the development of a real-time monitoring system with partial discharge sensors installed in each phase of a transformer and in a power cable bay. The monitoring system also contains some other type of sensors, making it suitable to monitor some other substation elements. Regarding the correlation between the transformer ageing, the degradation of its solid insulation and the quality of the insulating oil. A database system and diagnosing software that will both manipulate the acquired information and suggest some maintenance policies are also part of the developed system. © 2013 IEEE.

Navarro M.A.,Siemens AG | Monteiro A.J.,AES Eletropaulo
IEEE Transactions on Power Delivery | Year: 2015

This paper describes the concept and development of dry-type transformers for underground distribution networks, capable of operating in the open air, partially submerged or completely submerged without enclosure and in contact with water. The rating is in the range of 500 kVA to about 2000 kVA and 15- or 25-kV voltage. Immersion depth is limited to 3 m, due to the limits of the plug-in connectors on the high-voltage (HV) side of the transformer. A tap panel is provided on HV coils for ±5.0%. Dimensions and losses are comparable to those of liquid-immersed transformers. Electrical insulation is fully solid. The HV coils are shielded and the shield is grounded. © 1986-2012 IEEE.

Mafra J.,Jr. | Hosami M.,Fundacao para Inovacoes Tecnologicas FITec | Freitas L.,AES Eletropaulo | Martinelli M.,AES Eletropaulo | Almeida A.,AES Eletropaulo
2015 IEEE PES Innovative Smart Grid Technologies Latin America, ISGT LATAM 2015 | Year: 2015

Smart Grid (SG) is becoming a reality in Brazil in many projects covering different areas such as smart metering, demand-side management and distributed generation. It is known that the communications infrastructure is an essential part for a successful implementation of SG architecture and the choice of a communication system is very particular due to several weaknesses in communication technologies. In order to reduce such weaknesses, it was developed a reference design for a hybrid communication module based on the universally adopted IP protocol with two communication channels: Radio Frequency (RF) and Power Line Communication (PLC). It was used IEEE P1901.2 and IEEE 802.15.4g protocols in order to provide interoperability, reliability and resilience for the network. This article aims to present the motivations, the communication module developed and the test results obtained in the validation stage in laboratory and on site. In addition, the project is exploiting regulations and restraining requirements. © 2015 IEEE.

Pelegrini M.A.,Sinapsis Inovacao em Energia | Almeida C.F.M.,Sinapsis Inovacao em Energia | Kondo D.V.,Sinapsis Inovacao em Energia | Magalhaes C.H.,CH Consultoria | And 4 more authors.
Proceedings of International Conference on Harmonics and Quality of Power, ICHQP | Year: 2012

The phenomena related to Power Quality, as the voltage dips, imbalances, harmonic distortion and interruptions can cause damage to equipment used in industries and commercial sector. As soon as an outage occurs caused by one of these phenomena, there may be costs of various kinds, like production lost and others. Although there are mechanisms of cost internalization, such as penalties, the real cost evaluation of interruption for large consumers depends necessarily on structured survey and statistical evaluation. This paper presents the results of a survey of this kind, applied on large industrial and commercial consumers served by AES Eletropaulo. To validate the results, the obtained interruption costs were compared with the actual costs of one industrial consumer. © 2012 IEEE.

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