scispace - formally typeset
Search or ask a question
Author

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
More filters
Journal ArticleDOI
04 Jan 2022-Machines
TL;DR: In this article , a fault detection and diagnosis method for a fault-tolerant inverter for a multilevel switched reluctance machine (SRM) drive is presented, where the operation of the proposed topology is described for the two modes, fault tolerant and normal operation.
Abstract: The switched reluctance machine (SRM) is one of the most interesting machines, being adopted for many applications. However, this machine requires a power electronic converter that usually is the most fragile element of the system. Thus, in order to ensure high reliability for this system, it is fundamental to design a power electronic converter with fault-tolerant capability. In this context, a new solution is proposed to give this capability to the system. This converter was designed with the purpose to ensure fault-tolerant capability to two types of switch faults, namely open- and short-circuit. Moreover, apart from this feature, the proposed topology is characterized by a multilevel operation that allows improvement of the performance of the SRM, taking into consideration a wide speed range. Although the proposed solution is presented for an 8/6 SRM, it can be used for other configurations. The operation of the proposed topology will be described for the two modes, fault-tolerant and normal operation. Another aspect that is addressed in this paper is the proposal of fault detection and diagnosis method for this fault-tolerant inverter. It was specifically developed for a multilevel SRM drive. The theoretical assumptions will be verified through two different types of tests, firstly by simulation and secondly by experiments with a laboratory prototype.

7 citations

Proceedings ArticleDOI
18 Mar 2009
TL;DR: A methodology for the modeling of power systems on the transient analysis using a MATLAB/Simulink program that allows producing voltage and current transients that correspond to fault events, instabilities and the introduction of power electronics equipments in the power systems.
Abstract: One of the most important issues on the power system course is the study of the transient power systems. However, due to the complexity of the power systems networks, for an effective instruction of this topic it is required to use a computed simulation environment to provide a complement to analytical methods. Therefore, a methodology for the modeling of power systems on the transient analysis using a MATLAB/Simulink program is proposed. This methodology allows producing voltage and current transients that correspond to fault events, instabilities and the introduction of power electronics equipments in the power systems. Furthermore, this also allows students take advantage of the mathematical models they have derived to perform the desired simulation. Since state space models are used, this simulation tool is useful to study the transient phenomena and easier to compare with power systems laboratory results. So, students can understand how a simulation program have been developed, their capabilities and limitations. Several illustrative examples will be presented in order to clearly show the proposed methodology.

7 citations

Proceedings ArticleDOI
18 Mar 2009
TL;DR: In this article, an office facility equipped with renewable energy sources, where the users can recharge their plug-in electric vehicles, using the available renewable power, is presented, and the system controller is composed by a network of distributed local controllers interconnected to a server.
Abstract: Commercial office buildings with renewable energies are becoming more important in the actual context. That integration cannot be seen isolated from the strategic transport planning. Under this context this paper presents an office facility, equipped with renewable energy sources, where the users can recharge their plug-in electric vehicles, using the available renewable power. The system controller is composed by a network of distributed local controllers interconnected to a server. This system manages the power transfer between the building and the parked electric cars, including full discharge battery procedures. An important feature of the system is that it manages the energy consumption of each user, and assigns the respective costs to the correspondent company.

7 citations

Proceedings ArticleDOI
19 Mar 2012
TL;DR: In this paper, the authors used the inverter output currents to obtain a typical pattern in a 3D referential, which is used to detect and identify the faulty power switch.
Abstract: This paper investigates the use of the current trajectory mass center in a three dimensional referential. The proposed approach uses the inverter output currents. These currents are used to obtain a typical pattern in a three dimensional referential. According the fault type different patterns is obtained. In this way, with the proposed approach it is possible to detect and identify the faulty power switch In order to automatically identify the different patterns, it is used an algorithm to obtain a mass center of the 3D current trajectory. This results in a fast and reliable fault detection method. The applicability of the proposed technique, are confirmed through several simulation and experimental results.

6 citations

Proceedings ArticleDOI
11 May 2011
TL;DR: In this paper, a novel power conversion structure for grid-connected photovoltaic applications is presented, which uses a four-wire voltage source inverter, two single-phase voltage sources inverters and a scott transformer.
Abstract: In this paper a novel power conversion structure for grid-connected photovoltaic applications is presented. The proposed structure uses a four-wire voltage source inverter, two single-phase voltage source inverters and a scott transformer. PV modules arrangements can be divided in several groups. This power conversion structure is suitable for multi-string technology. The proposed structure allows multilevel output voltage. A sinusoidal pulse with modulator particularly adapted to this power converter structure is also proposed. Several simulation results are presented in order to verify the effectiveness of the proposed system.

6 citations


Cited by
More filters
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