Clodualdo Venicio de Sousa

Clodualdo Venicio de Sousa
Universidade Federal de Itajubá (UNIFEI) · ICT

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21
Publications
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187
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Publications

Publications (21)
Article
Full-text available
The long duration test of electrical equipment is an important tool for users and manufacturers to determine precise information as, for example, equipment operational limits, lifespan, thermal behavior, etc. Although useful, these long duration tests are usually conducted using passive elements such as in the burn-in test, consuming a great amount...
Conference Paper
Esse trabalho propõe a implementação por simulação de um conversor formador de rede, operando isolado e em paralelo com um conversor de suporte a rede, com o intuito de realizar o compartilhamento de potência ativa e reativa por meio do controle droop.
Article
Some grid codes establish that during voltage sags, the generation units employing static converters must favor the electrical mains support. Unbalanced voltage sags generate grid power oscillations with twice the fundamental frequency. This way, the converter control can be modified to mitigate the unbalanced sag effects to the grid converter. The...
Conference Paper
Full-text available
Power electronics may be applied in processes of control and conversion of electrical energy, and can be used in order to obtain greater efficiency and quality in those processes. One possible application of this technology is the implementation of active filters for mitigation of reactive and harmonic current components in electrical grids, as wel...
Article
Full-text available
Due to the increasing number of wind power plants, several countries have modified their grid codes to include specific requirements for the connection of this technology to the power system. One of the requirements is the ride-through fault capability (RTFC), i.e., the system capability to sustain operation during voltage sags. In this sense, the...
Article
A significant number of power apparatus, before being commercialized or during maintenance, are submitted to laboratory tests where real operation conditions are emulated. These tests generally demand high energy consumption which increases the maintenance costs and the overall equipment investment. This paper proposes a platform to test power tran...
Conference Paper
This article proposes the analysis of the quality of the power provided by two commercial photovoltaic inverters. Initially the inverters are analyzed based on the recent regulations, afterwards the equipment is compared based in the measurement of the distortion rates and power factor during the analyzing period.
Article
Modern grid codes worldwide determine specific requirements for the connection of wind energy conversion systems (WECSs) to the grid. One of the requirements is the ride-through fault capability (RTFC) or low-voltage ridethrough (LVRT), which defines that the plants must not be disconnected from the grid at certain levels of voltage sags and also m...
Article
Modern grid codes determine that wind generation plants must not be disconnected from the grid during some levels of voltage sags and contribute to network stabilization. Wind energy conversion systems equipped with the doubly fed induction generator (DFIG) are one of the most frequently used topologies, but they are sensitive to grid disturbances...
Conference Paper
Wind energy conversion systems using the doubly-fed induction generator (DFIG) are the most commercialized topology worldwide, because this technology uses converters dimensioned for ±30% of the system rated power, thus reducing the equipment cost. The direct connection of the DFIG stator to the electrical system increases its sensitivity to grid d...
Conference Paper
Full-text available
Most of power transformers, before being commercialized, must undertake a series of tests with the objective of analyzing their operational behavior under real operating conditions. Such tests sometimes demand a high amount of power increasing significantly their costs. The paper presents a proposed system which allows testing in closed loop, reduc...

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