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Prof. Armando Pires
Polytechnic Institute of Setúbal, Portugal

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0 Electric Drives
0 Electric Machines
0 Engineering Education
0 Power Electronics
0 Nonlinear Systems

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Review
Published: 06 July 2020 in Energies
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The use of power electronic converters is essential for the operation of Switched Reluctance Machines (SRMs). Many topologies and structures have been developed over the last years considering several specific applications for this kind of machine, improving the control strategies, performance range, fault-tolerant operation, among other aspects. Thus, due to the great importance of power electronic converters in such applications, this paper is focused on a detailed review of main structures and topologies for SRM drives. The proposed study is not limited to the classic two-level power converters topologies dedicated to the SRMs; it also presents a review about recent approaches, such as multilevel topologies and based on impedance source network. Moreover, this review is also focused on a new class of topologies associated to these machines, namely the ones with fault-tolerant capability. This new category of topologies has been a topic of research in recent years, being currently considered an area of great interest for future research work. An analysis, taking into consideration the main features of each structure and topology, was addressed in this review. A classification and comparison of the several structures and topologies for each kind of converter, considering modularity, boost capability, number of necessary switches and phases, integration in the machine design, control complexity, available voltage levels and fault-tolerant capability to different failure modes, is also presented. In this way, this review also includes a description of the presented solutions taking into consideration the reliability of the SRM drive.

ACS Style

Vitor Fernão Pires; Armando José Pires; Armando Cordeiro; Daniel Foito. A Review of the Power Converter Interfaces for Switched Reluctance Machines. Energies 2020, 13, 3490 .

AMA Style

Vitor Fernão Pires, Armando José Pires, Armando Cordeiro, Daniel Foito. A Review of the Power Converter Interfaces for Switched Reluctance Machines. Energies. 2020; 13 (13):3490.

Chicago/Turabian Style

Vitor Fernão Pires; Armando José Pires; Armando Cordeiro; Daniel Foito. 2020. "A Review of the Power Converter Interfaces for Switched Reluctance Machines." Energies 13, no. 13: 3490.

Journal article
Published: 19 May 2020 in Applied Sciences
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The power electronic converter design is essential for the operation of the switched reluctance motor (SRM). Thus, a fault-tolerant power converter is fundamental to ensure high reliability and extend the drive operation. To achieve fault tolerance, fault detection and diagnosis methods are critical in order to identify, as soon as possible, the failure mode of the drive. To provide such capability, it is proposed in this paper a new fault-tolerant power converter scheme combined with a fault detection method regarding the most common power semiconductors failures in SRM drives. The fast and reliable proposed diagnosis method is based on the entropy theory. Based on this theory, normalized indexes (diagnostic variables) are created, which are independent from the load and speed of the motor. Through this method, it is possible to identify the faulty leg, as well as the type of power semiconductor fault. To test and evaluate the proposed solution several laboratory experiments were carried out using a 2 kW four-phase 8 / 6 SRM.

ACS Style

Vitor F. Pires; Tito G. Amaral; Armando Cordeiro; Daniel Foito; Armando J. Pires; João F. Martins. Fault-Tolerant SRM Drive with a Diagnosis Method Based on the Entropy Feature Approach. Applied Sciences 2020, 10, 3516 .

AMA Style

Vitor F. Pires, Tito G. Amaral, Armando Cordeiro, Daniel Foito, Armando J. Pires, João F. Martins. Fault-Tolerant SRM Drive with a Diagnosis Method Based on the Entropy Feature Approach. Applied Sciences. 2020; 10 (10):3516.

Chicago/Turabian Style

Vitor F. Pires; Tito G. Amaral; Armando Cordeiro; Daniel Foito; Armando J. Pires; João F. Martins. 2020. "Fault-Tolerant SRM Drive with a Diagnosis Method Based on the Entropy Feature Approach." Applied Sciences 10, no. 10: 3516.

Journal article
Published: 17 January 2020 in IEEE Access
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Reliability in the electrical drives is becoming an important issue in many applications. In this context, the reliability associated to the switched reluctance machine (SRM) is also an important area of research. One of the major problems, that strongly affect its operation, are drive power semiconductors faults. Typical power converter topologies used in SRM drives cannot handle faults in their power semiconductors. So, this paper presents a power converter topology that provides fault-tolerant capabilities to the drive under a switch fault. This power converter will be used considering that a change in the direction of the current that flows in the SRM windings does not affect the behavior of the machine. Besides that, the proposed power converter will allow to generate multilevel phase voltages in order to apply different voltage levels as function of the SRM speed. A laboratory power converter was developed to test the SRM drive in normal and faulty conditions. From the obtained results it was possible to verify the fault-tolerant capability of the drive under switch faults in different devices and failure modes. It was also possible to confirm the multilevel operation of the drive.

ACS Style

V. Fernao Pires; Armando Cordeiro; Daniel Foito; A. J. Pires; J. F. Martins; Hao Chen. A Multilevel Fault-Tolerant Power Converter for a Switched Reluctance Machine Drive. IEEE Access 2020, 8, 21917 -21931.

AMA Style

V. Fernao Pires, Armando Cordeiro, Daniel Foito, A. J. Pires, J. F. Martins, Hao Chen. A Multilevel Fault-Tolerant Power Converter for a Switched Reluctance Machine Drive. IEEE Access. 2020; 8 (99):21917-21931.

Chicago/Turabian Style

V. Fernao Pires; Armando Cordeiro; Daniel Foito; A. J. Pires; J. F. Martins; Hao Chen. 2020. "A Multilevel Fault-Tolerant Power Converter for a Switched Reluctance Machine Drive." IEEE Access 8, no. 99: 21917-21931.

Journal article
Published: 20 June 2019 in Measurement
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This paper presents a study of a system to detect the angular position of the shaft of an 8/6 Switched Reluctance Machine (SRM) for position control. The detection system is independent of the machine circuits and is based on the indirect measurement of the induction coefficient, using a diagnostic coil. This induction coefficient, variable with the angular position, is the variable element of an oscillator, producing a frequency modulation. The intrinsic problems that this indirect position measurement system presents, particularly related with position control, are explained. The influence of the machine temperature, of the rotor speed and of the magnetic circuit saturation are also discussed.

ACS Style

Silviano Rafael; P.J. Costa Branco; A.J. Pires. SRM sensorless for position control based on a frequency modulation system. Measurement 2019, 146, 171 -178.

AMA Style

Silviano Rafael, P.J. Costa Branco, A.J. Pires. SRM sensorless for position control based on a frequency modulation system. Measurement. 2019; 146 ():171-178.

Chicago/Turabian Style

Silviano Rafael; P.J. Costa Branco; A.J. Pires. 2019. "SRM sensorless for position control based on a frequency modulation system." Measurement 146, no. : 171-178.

Conference paper
Published: 16 April 2019 in Lecture Notes in Control and Information Sciences
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Offshore field development relies on multiple optimization techniques targeting a feasible and cost-effective production solution yet are focused on the field itself. While so, advancements in offshore engineering bring increasingly complex subsea infrastructures to depths in the excess of 3,500 m. Many offshore production topsides which currently rely on costly and harmful onboard thermal-based power generation are turning to high voltage power-from-shore electrification solutions to cope with the challenges being brought by subsea infrastructures. An optimal electrification of these subsea templates is a challenge on its own as the seafloor morphology and well distribution is far from consistent. This paper presents a combined k-means and genetic-algorithm optimization to assess how the combined deployment of high voltage umbilical, wellheads and subsea substations can be optimized for the lowest cost possible. Results show a significant improvement in optimization of the total umbilical length as well as the substation positioning on the seabed.

ACS Style

Tiago A. Antunes; Rui Castro; P. J. Santos; A. J. Pires; Matthias Foehr. Optimized Electrification of Subsea Oil & Gas Infrastructures Based in Genetic Algorithm. Lecture Notes in Control and Information Sciences 2019, 214 -223.

AMA Style

Tiago A. Antunes, Rui Castro, P. J. Santos, A. J. Pires, Matthias Foehr. Optimized Electrification of Subsea Oil & Gas Infrastructures Based in Genetic Algorithm. Lecture Notes in Control and Information Sciences. 2019; ():214-223.

Chicago/Turabian Style

Tiago A. Antunes; Rui Castro; P. J. Santos; A. J. Pires; Matthias Foehr. 2019. "Optimized Electrification of Subsea Oil & Gas Infrastructures Based in Genetic Algorithm." Lecture Notes in Control and Information Sciences , no. : 214-223.

Conference paper
Published: 01 January 2017 in 2017 11th IEEE International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG)
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Multilevel inverters allow to generate AC voltages with low total harmonic distortion (THD) but requires an increased number of power switches. One of the disadvantages of that is the increased probability of a fault in one of the power switches. Thus in order to improve the reliability of the converter a fast and robust fault detection scheme must be used. In this context this paper presents a new fault detection scheme based on the AC voltages of the inverter. The proposed scheme uses fault factors that are based on the statistic moment method. This method was used for the identification of image patterns. Due to this the proposed scheme allows for a robust detection to load or voltage variations. To test the method was used a cascaded H-bridge inverter with five levels. Several tests were performed through numerical results. The use of a laboratory prototype was also used to confirm the proposed scheme.

ACS Style

V. Fernao Pires; Tito G. Amaral; D. Foito; A. J. Pires. Cascaded H-bridge multilevel inverter with a fault detection scheme based on the statistic moments indexes. 2017 11th IEEE International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG) 2017, 193 -198.

AMA Style

V. Fernao Pires, Tito G. Amaral, D. Foito, A. J. Pires. Cascaded H-bridge multilevel inverter with a fault detection scheme based on the statistic moments indexes. 2017 11th IEEE International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG). 2017; ():193-198.

Chicago/Turabian Style

V. Fernao Pires; Tito G. Amaral; D. Foito; A. J. Pires. 2017. "Cascaded H-bridge multilevel inverter with a fault detection scheme based on the statistic moments indexes." 2017 11th IEEE International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG) , no. : 193-198.

Conference paper
Published: 01 January 2017 in 2017 11th IEEE International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG)
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Bulk power transmission across long distances has been mostly based in High Voltage Alternated Current solutions, not only due to their flexibility and cost, but also driven by the broad available portfolio. However, this solution has known physical boundaries which are quite relevant especially under the analysis of long-distance offshore wind farm applications. The aim of this paper is to present those limitations by means of a simple, graphical and straightforward computational tool, capable of executing dynamic simulations of several transmission lines or cables, by quickly adjusting the voltage, current, power factor and distance conditions. The conclusions will be shown mainly by means of stress points and operation ranges.

ACS Style

Tiago A. Antunes; Paulo J. Santos; Armando J. Pires. HVAC transmission restrictions in large scale offshore wind farm applications. 2017 11th IEEE International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG) 2017, 46 -52.

AMA Style

Tiago A. Antunes, Paulo J. Santos, Armando J. Pires. HVAC transmission restrictions in large scale offshore wind farm applications. 2017 11th IEEE International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG). 2017; ():46-52.

Chicago/Turabian Style

Tiago A. Antunes; Paulo J. Santos; Armando J. Pires. 2017. "HVAC transmission restrictions in large scale offshore wind farm applications." 2017 11th IEEE International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG) , no. : 46-52.

Conference paper
Published: 18 August 2016 in 2016 10th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG)
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The early failure detection of induction motors is considered very important in order to ensure their stability and high performance. Thus, condition monitoring of these motors are essential to ensure that. However, the effectiveness of the fault diagnosis depends on the quality of the fault features selection that is used in the adopted method. In this way, this paper will present a comparative study of three methods based on the electrical signal analysis. The first one is the most known method, motor current signature analysis (MCSA). Another method based on the analysis of spectral current, is the motor square current signature analysis (MSCSA), will also be used. Finally a third method based on principal component analysis (PCA) is also used. The performance of the methods is tested under different fault and load conditions. Experimental results are presented in order to compare the performance between the three methods.

ACS Style

Vitor Fernao Pires; J. F. Martins; A. J. Pires; Leao Rodrigues. Induction motor broken bar fault detection based on MCSA, MSCSA and PCA: A comparative study. 2016 10th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG) 2016, 298 -303.

AMA Style

Vitor Fernao Pires, J. F. Martins, A. J. Pires, Leao Rodrigues. Induction motor broken bar fault detection based on MCSA, MSCSA and PCA: A comparative study. 2016 10th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG). 2016; ():298-303.

Chicago/Turabian Style

Vitor Fernao Pires; J. F. Martins; A. J. Pires; Leao Rodrigues. 2016. "Induction motor broken bar fault detection based on MCSA, MSCSA and PCA: A comparative study." 2016 10th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG) , no. : 298-303.

Conference paper
Published: 18 August 2016 in 2016 10th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG)
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This paper presents a design assistance methodology of low speed Switched Reluctance Machines (SRM) using field-based models. The magnetic properties of the iron, the number of rotor poles, and the number of poles per phase, all play a significant role in the machine design. The proposed comparison procedure uses field-based models along with scale models, based on similarity laws, to compare SRM designs. The field-based models are here applied in dimensional analysis of regular and non-regular topologies distinguished by different characteristics of electric and magnetic circuits. As an added value for this methodology, similarity laws take into account physical phenomena like thermal changes and magnetic saturation. Hypotheses introduced in the methodology formulation were verified by finite element analysis. This work is motivated by the application of SRM to direct drive wind converters and other low speed renewable energy systems. As an application example of this methodology, a non-regular topology with short flux-paths was compared with a regular prototype, 3-phase, 12/16, SRM, designed for a direct drive wind turbine: a gain of power per unit of mass is achieved with the former one.

ACS Style

P. Lobato; J. A. Dente; J. F. Martins; A. J. Pires. Field-based models for low speed switched reluctance machine designs. 2016 10th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG) 2016, 292 -297.

AMA Style

P. Lobato, J. A. Dente, J. F. Martins, A. J. Pires. Field-based models for low speed switched reluctance machine designs. 2016 10th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG). 2016; ():292-297.

Chicago/Turabian Style

P. Lobato; J. A. Dente; J. F. Martins; A. J. Pires. 2016. "Field-based models for low speed switched reluctance machine designs." 2016 10th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG) , no. : 292-297.

Journal article
Published: 01 December 2015 in Electric Power Systems Research
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This paper presents a study about the angular position control of a regular four phases 8/6 Switched Reluctance Machine (SRM). The SRM has very interesting characteristics, however there is still not a comprehensive use of it as a position controlled system. Effectively there are many papers in the literature about position detection but still few about SRM position control. This work pretends to be a contribution to overcome this limitation. The theoretical development and design of a robust and accurate sliding mode controller (SMC) is presented, based on the machine torque characteristics, with the correspondent experimental implementation based on the construction of a prototype. It is a low cost system, which makes it very attractive and competitive in the market of drive systems for industrial processes. Experimental tests were done in order to validate the theoretical development. The performance and dynamic behaviour of the SRM system with angular position control is presented and discussed.

ACS Style

Silviano Rafael; Paulo Branco; Armando Pires. Sliding mode angular position control for an 8/6 Switched Reluctance Machine: Theoretical concept, design and experimental results. Electric Power Systems Research 2015, 129, 62 -74.

AMA Style

Silviano Rafael, Paulo Branco, Armando Pires. Sliding mode angular position control for an 8/6 Switched Reluctance Machine: Theoretical concept, design and experimental results. Electric Power Systems Research. 2015; 129 ():62-74.

Chicago/Turabian Style

Silviano Rafael; Paulo Branco; Armando Pires. 2015. "Sliding mode angular position control for an 8/6 Switched Reluctance Machine: Theoretical concept, design and experimental results." Electric Power Systems Research 129, no. : 62-74.

Research articles
Published: 01 November 2015 in IET Electric Power Applications
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This study presents a design methodology based on scale models for low speed switched reluctance generators (SRG). This study is motivated by the application of SRG to direct-drive wind turbines and other low speed renewable energy systems. In direct drive energy converters considerable simplifications result from the elimination of the gear box which has generally been used to interface a slowly rotating shaft with the generator shaft. The comparison and evaluation of magnetic structures plays an important role in the SRG design. General design methodologies are usually oriented towards the evaluation of stator/rotor poles combinations for regular switched reluctance machines. Besides covering that feature, the formulation of scale laws proposed is also suitable to compare other SRG topologies distinguished by different characteristics of electric and magnetic circuits and their own relative position. In addition, this methodology can be extended to other physical phenomena such as thermal changes and magnetic saturation by introducing some constraints. The running example compares a modular short flux-path topology versus a low speed 20 kW prototype SRG designed for a direct drive wind turbine. The modular topology can optimise the efficiency and weight taking benefits from the significant gain of power per unit of volume and lower losses.

ACS Style

Pedro Lobato; Joaquim A. Dente; João F. Martins; Armando J. Pires. Scale models formulation of switched reluctance generators for low speed energy converters. IET Electric Power Applications 2015, 9, 652 -659.

AMA Style

Pedro Lobato, Joaquim A. Dente, João F. Martins, Armando J. Pires. Scale models formulation of switched reluctance generators for low speed energy converters. IET Electric Power Applications. 2015; 9 (9):652-659.

Chicago/Turabian Style

Pedro Lobato; Joaquim A. Dente; João F. Martins; Armando J. Pires. 2015. "Scale models formulation of switched reluctance generators for low speed energy converters." IET Electric Power Applications 9, no. 9: 652-659.

Conference paper
Published: 01 November 2015 in IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society
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The study and assessment of Power Quality issues is nowadays a very important subject, particularly regarding Cyber-physical and Industrial Agents based systems, which are extremely sensitive to Power Quality disturbances. Giving students or engineers practical experience in this field requires a large investment from teaching institutions. This paper presents a laboratory device that emulates Power Quality disturbances in order to provide the required experimental expertize in the subject. It addresses limiting aspects such as harmonic distortion, flicker, sags, swells and transients. The developed system presents a good opportunity for technicians, even without deep knowledge on the field of power quality, to learn basic principles and be able to identify Power Quality events. Since the system is based on real data, represents a valuable approach giving trainees practical knowledge on the field.

ACS Style

Joao F. Martins; Pedro Pereira; A. J. Pires; Vitor Fernao Pires. A new teaching tool to enhance power quality assessment. IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society 2015, 004158 -004162.

AMA Style

Joao F. Martins, Pedro Pereira, A. J. Pires, Vitor Fernao Pires. A new teaching tool to enhance power quality assessment. IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society. 2015; ():004158-004162.

Chicago/Turabian Style

Joao F. Martins; Pedro Pereira; A. J. Pires; Vitor Fernao Pires. 2015. "A new teaching tool to enhance power quality assessment." IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society , no. : 004158-004162.

Conference paper
Published: 01 June 2015 in 2015 9th International Conference on Compatibility and Power Electronics (CPE)
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This paper investigates the design of low speed Switched Reluctance Generators (SRG) based on a different paradigm. The proposed design procedure utilises the formulation of similarity laws and scale models to compare SRG magnetic structures. Besides evaluating regular and similar topologies the scale models are here applied in dimensional analysis of topologies distinguished by different characteristics of electric and magnetic circuits. Furthermore, the scale models methodology can cover physical phenomena like thermal changes and magnetic saturation by introducing some constraints. This work is motivated by the application of SRG to direct drive wind converters and other low speed renewable energy systems. The paper contains the illustration of dimensional analyses on a modular topology with short flux-paths designed for a direct drive wind turbine. Comparing with a regular machine, the short flux-paths topology can optimize the efficiency and weight taking benefits from the significant gain of power per unit of mass and lower losses.

ACS Style

P. Lobato; J.A. Dente; J.F. Martins; A. J. Pires. Short flux-paths in switched reluctance generators for direct drive wind energy converters. 2015 9th International Conference on Compatibility and Power Electronics (CPE) 2015, 307 -311.

AMA Style

P. Lobato, J.A. Dente, J.F. Martins, A. J. Pires. Short flux-paths in switched reluctance generators for direct drive wind energy converters. 2015 9th International Conference on Compatibility and Power Electronics (CPE). 2015; ():307-311.

Chicago/Turabian Style

P. Lobato; J.A. Dente; J.F. Martins; A. J. Pires. 2015. "Short flux-paths in switched reluctance generators for direct drive wind energy converters." 2015 9th International Conference on Compatibility and Power Electronics (CPE) , no. : 307-311.

Conference paper
Published: 01 May 2013 in 4th International Conference on Power Engineering, Energy and Electrical Drives
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The load forecast is part of the global management of the electrical networks, namely at the transport and distribution levels. This type of methodologies allows to the system operator, to establish and take some important decisions concerning to the mix production and network management, with the minimum of discretionarity. The load forecast in particularly the peak load forecast, represents an important economic improvement in the global electrical systems. Also in certain circumstances, allow reducing the contribution of the non-renewable units, in the daily mixing production. The regressive methodologies specially the artificial neural networks, are normally used in this type of approaches, with satisfactory results. In this paper is proposed a careful analysis in order to define the best-input vector in order to feed the regressive methodology. It was establish careful analyses of the load consumption series. It makes use of a procedural sequence for the pre-processing phase that allows capturing certain predominant relations among certain different sets of available data, providing a more solid basis to decisions regarding the composition of the input vector to ANN. The methodological approach is discussed and a real life case study is used for illustrating the defined steps, the ANN and the quality level of the results.

ACS Style

P. J. Santos; Silviano Rafael; A. J. Pires. Load forecasting, the importance of the probability “tails” in the definition of the input vector. 4th International Conference on Power Engineering, Energy and Electrical Drives 2013, 646 -649.

AMA Style

P. J. Santos, Silviano Rafael, A. J. Pires. Load forecasting, the importance of the probability “tails” in the definition of the input vector. 4th International Conference on Power Engineering, Energy and Electrical Drives. 2013; ():646-649.

Chicago/Turabian Style

P. J. Santos; Silviano Rafael; A. J. Pires. 2013. "Load forecasting, the importance of the probability “tails” in the definition of the input vector." 4th International Conference on Power Engineering, Energy and Electrical Drives , no. : 646-649.

Journal article
Published: 01 February 2013 in Measurement
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ACS Style

Vitor Fernao Pires; Manuel Kadivonga; João Martins; Armando Pires. Motor square current signature analysis for induction motor rotor diagnosis. Measurement 2013, 46, 942 -948.

AMA Style

Vitor Fernao Pires, Manuel Kadivonga, João Martins, Armando Pires. Motor square current signature analysis for induction motor rotor diagnosis. Measurement. 2013; 46 (2):942-948.

Chicago/Turabian Style

Vitor Fernao Pires; Manuel Kadivonga; João Martins; Armando Pires. 2013. "Motor square current signature analysis for induction motor rotor diagnosis." Measurement 46, no. 2: 942-948.

Conference paper
Published: 01 October 2012 in IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society
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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.

ACS Style

J. F. Martins; Vitor Fernao Pires; Celson Lima; A. J. Pires. Fault detection and diagnosis of grid-connected power inverters using PCA and current mean value. IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society 2012, 5185 -5190.

AMA Style

J. F. Martins, Vitor Fernao Pires, Celson Lima, A. J. Pires. Fault detection and diagnosis of grid-connected power inverters using PCA and current mean value. IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society. 2012; ():5185-5190.

Chicago/Turabian Style

J. F. Martins; Vitor Fernao Pires; Celson Lima; A. J. Pires. 2012. "Fault detection and diagnosis of grid-connected power inverters using PCA and current mean value." IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society , no. : 5185-5190.

Conference paper
Published: 01 October 2012 in IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society
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This paper presents a position tracking control for a switched reluctance motor (SRM) in servomotor operation. The sliding mode control provides attractive features such as fast response and relative insensitivity to the variations in the plant parameter. In this work an application of a sliding mode position control based on the reaching law control (RLC) approach is discussed. The controller was tested and evaluated on a SRM servomotor. The controller and the command are installed on a digital signal controller. The experimental results of the SRM dynamics response in position tracking control are presented to demonstrate the effectiveness of this low cost control system.

ACS Style

Silviano Rafael; P. J. Costa Branco; Armando Pires. A study and design of a position tracking control for an 8/6 switched reluctance machine. IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society 2012, 1643 -1647.

AMA Style

Silviano Rafael, P. J. Costa Branco, Armando Pires. A study and design of a position tracking control for an 8/6 switched reluctance machine. IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society. 2012; ():1643-1647.

Chicago/Turabian Style

Silviano Rafael; P. J. Costa Branco; Armando Pires. 2012. "A study and design of a position tracking control for an 8/6 switched reluctance machine." IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society , no. : 1643-1647.

Conference paper
Published: 01 October 2012 in 2012 13th Biennial Baltic Electronics Conference
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This paper introduces a new structure for a photovoltaic system. This system is based on a string architecture with four power electronic conditioning units. In order to keep it as simple as possible, it uses four single-phase voltage source inverters. The inverters are connected to the utility grid through a special transformer. This transformer is based on a Scott transformer and allows connecting the four inverters to a three-phase system. Several simulation results are presented in order to evaluate the feasibility of the proposed photovoltaic system.

ACS Style

Vitor Fernao Pires; J. F. Martins; Octavio Dias; A. J. Pires; Chen Hao. A photovoltaic string architecture with multiple single-phase inverter modules. 2012 13th Biennial Baltic Electronics Conference 2012, 211 -214.

AMA Style

Vitor Fernao Pires, J. F. Martins, Octavio Dias, A. J. Pires, Chen Hao. A photovoltaic string architecture with multiple single-phase inverter modules. 2012 13th Biennial Baltic Electronics Conference. 2012; ():211-214.

Chicago/Turabian Style

Vitor Fernao Pires; J. F. Martins; Octavio Dias; A. J. Pires; Chen Hao. 2012. "A photovoltaic string architecture with multiple single-phase inverter modules." 2012 13th Biennial Baltic Electronics Conference , no. : 211-214.

Conference paper
Published: 01 October 2012 in IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society
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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 the S-Transform to detect and identify faulty power switches in voltage source inverters. The S-Transform 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.

ACS Style

J. F. Martins; Rui Lopes; Vitor Fernao Pires; A. J. Pires; Celson Lima. The application of S-transform in fault detection and diagnosis of grid-connected power inverters. IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society 2012, 5247 -5252.

AMA Style

J. F. Martins, Rui Lopes, Vitor Fernao Pires, A. J. Pires, Celson Lima. The application of S-transform in fault detection and diagnosis of grid-connected power inverters. IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society. 2012; ():5247-5252.

Chicago/Turabian Style

J. F. Martins; Rui Lopes; Vitor Fernao Pires; A. J. Pires; Celson Lima. 2012. "The application of S-transform in fault detection and diagnosis of grid-connected power inverters." IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society , no. : 5247-5252.

Conference paper
Published: 01 November 2011 in 2011 5th IEEE International Conference on E-Learning in Industrial Electronics (ICELIE)
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Teaching power electronics is a complex task. The classical approach is based on lectures and laboratories assisted by teachers. However, teaching power electronics it is not easy due to the student's motivation related to the difficult of this subject. In this way, this paper presents an approach to teach power electronics based on the students self learning. Instead of using the classical approach, students must develop a research work and a complete power converter prototype. Since students must have some background, this is a second course of power electronics. It is finally here that they clearly understand how a power converter works.

ACS Style

Vitor Fernao Pires; Armando Pires; Octavio Dias. Self-learning as a tool for teaching power electronics. 2011 5th IEEE International Conference on E-Learning in Industrial Electronics (ICELIE) 2011, 104 -108.

AMA Style

Vitor Fernao Pires, Armando Pires, Octavio Dias. Self-learning as a tool for teaching power electronics. 2011 5th IEEE International Conference on E-Learning in Industrial Electronics (ICELIE). 2011; ():104-108.

Chicago/Turabian Style

Vitor Fernao Pires; Armando Pires; Octavio Dias. 2011. "Self-learning as a tool for teaching power electronics." 2011 5th IEEE International Conference on E-Learning in Industrial Electronics (ICELIE) , no. : 104-108.