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V. Fernao Pires

Bio: V. Fernao Pires is an academic researcher from INESC-ID. The author has contributed to research in topics: Inverter & Fault (power engineering). The author has an hindex of 18, co-authored 154 publications receiving 1457 citations. Previous affiliations of V. Fernao Pires include Technical University of Lisbon & University of Lisbon.


Papers
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Journal ArticleDOI
TL;DR: The obtained results allow the conclusion that the PV system harmonic compensation capability is able to attenuate the harmonics, therefore improving the voltage profile, and reducing the power losses and voltage drop on the LV distribution network.

17 citations

Proceedings ArticleDOI
24 Dec 2012
TL;DR: The application of PCA and average value computation to detect and identify faulty power switches in voltage source inverters and results in a fast and reliable fault detection methodology.
Abstract: One of the most used power converters is the three-phase voltage source power inverter. This is one of the reasons why it is so important to assure a continuous and safety operation of this power converter. This paper considers the application of PCA and average value computation to detect and identify faulty power switches in voltage source inverters. The PCA is applied to the inverter output currents in order to get a specific pattern that allows the identification of the fault. This results in a fast and reliable fault detection methodology. The applicability of the proposed technique is confirmed through simulation and experimental results.

16 citations

Proceedings ArticleDOI
01 Jan 2009
TL;DR: In this article, the use of the park transformation mass center applied to the stator currents as a method for diagnosing the occurrence of stator winding faults in induction motor is proposed.
Abstract: This paper proposes the use of the park transformation mass center applied to the stator currents as a method for diagnosing the occurrence of stator winding faults in induction motor Induction motor stator currents are first measured and recorded Then, the park transform is applied to the obtained currents in order to obtain a specific pattern that allows the identification of the stator winding fault For a healthy motor, a single point in a dq-plane is obtained However, for an induction motor with some stator winding fault one obtains a circle, in the dq-plane, which is dependent on the fault severity Accordingly to this relationship a fault severity is reported In order to show the applicability of the proposed technique, several simulation and experimental results are presented

16 citations

Proceedings ArticleDOI
01 Nov 2016
TL;DR: In this article, a non-isolated bidirectional buck-boost converter with high voltage gain for electrochemical storage devices used in distributed generation systems is presented, and the proposed topology presents quadratic characteristics in both step-down (Buck) and step-up (Boost) operation modes.
Abstract: The increasing number of distributed generation systems using renewable and non-conventional energy sources show the trend of future generation systems. Most of these systems require power electronic converters as an interface between the DC voltage buses and electrochemical storage systems. Such storage systems, like batteries or supercapacitors, usually need bidirectional DC-DC converters to allow their charge or discharge according with necessary operation conditions. In this paper, a non-isolated bidirectional Buck-Boost converter with high voltage gain for electrochemical storage devices used in distributed generation systems is presented. To achieve high voltage gain ratios, the proposed topology presents quadratic characteristics in both step-down (Buck) and step-up (Boost) operation modes. In addition to the wide conversion range, it presents continuous input and output current, reduced charging/discharging ripple and simple control circuitry. All these features allow the energy exchange smoothly and continuously resulting in a longer durability of storage devices. The principle of the operation of the proposed converter in both operation modes, as well as their theoretical analysis will be discussed. The performance of this bidirectional power converter is confirmed through simulation and experimental results.

15 citations

Proceedings ArticleDOI
05 Jun 2013
TL;DR: In this paper, a system controller for a three-phase grid-connected inverter for photovoltaic applications is presented, where active and reactive currents are both controlled in order to realize active power supply and reactive power compensation.
Abstract: A system controller for a three-phase grid-connected inverter for photovoltaic applications is presented. The active and reactive currents will both be controlled in order to realize active power supply and reactive power compensation. The three-phase inverter will be controlled by a fast and robust sliding mode controller. The active and reactive current references will be calculated in order to maximize the electrical energy produced by PV arrays and at the same time as a reactive power compensator. For the calculation of these references the maximum apparent power of the three-phase inverter is also considered. When the PV system is not working at full power the three-phase inverter can also be working as reactive power compensator. The grid injected reactive power is limited by the maximum apparent power of the inverter. This allows integrating this system into a smart-grid. Numerical simulations obtained in the Simulink environment are presented in order to validate the proposed system.

15 citations


Cited by
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01 Sep 2010

2,148 citations

01 Jan 1992
TL;DR: In this paper, a multilevel commutation cell is introduced for high-voltage power conversion, which can be applied to either choppers or voltage-source inverters and generalized to any number of switches.
Abstract: The authors discuss high-voltage power conversion. Conventional series connection and three-level voltage source inverter techniques are reviewed and compared. A novel versatile multilevel commutation cell is introduced: it is shown that this topology is safer and more simple to control, and delivers purer output waveforms. The authors show how this technique can be applied to either choppers or voltage-source inverters and generalized to any number of switches.<>

1,202 citations

Journal ArticleDOI
TL;DR: The main objective of the two-part survey named ‘Recent Advances in the Design, Modeling, and Control of Multiphase Machines’ is to present relevant contributions to encourage and guide new advances and developments in the field.
Abstract: The main objective of this two-part state-of-the-art paper called “Recent Advances in the Design, Modeling, and Control of Multiphase Machines” is to present latest contributions in the multiphase machines' field. The first part of this paper focuses on the recent progress in the design, modeling, and control, whereas the drive is in healthy operation. This second part presents relevant contributions in two not analyzed fields. The first is in relation with the use of the additional degrees of freedom of multiphase machines and the exploitation of their fault-tolerant capabilities without adding extra hardware. The second one analyzes multiphase generation, particularly in grid-connected wind energy conversion systems and stand-alone applications. Recent progresses are shown and open challenges and future research directions are discussed.

607 citations

Journal ArticleDOI
TL;DR: The control systems for the operation of DFIGs in wind energy applications are reviewed for connections to balanced or unbalanced grids, and sensorless control.
Abstract: Doubly fed induction generators (DFIGs), often organized in wind parks, are the most important generators used for variable-speed wind energy generation. This paper reviews the control systems for the operation of DFIGs and brushless DFIGs in wind energy applications. Control systems for stand-alone operation, connection to balanced or unbalanced grids, sensorless control, and frequency support from DFIGs and low-voltage ride-through issues are discussed.

594 citations

Journal ArticleDOI
TL;DR: Compared with traditional neural network, the SAE-based DNN can achieve superior performance for feature learning and classification in the field of induction motor fault diagnosis.

562 citations