http://hdl.handle.net/2117/3834 Mon, 20 May 2013 02:41:52 GMT 2013-05-20T02:41:52Z webmaster.bupc@upc.edu Universitat Politècnica de Catalunya. Servei de Biblioteques i Documentació no http://hdl.handle.net/2117/19146 Title: Dynamic behaviour of a back-to-back five-level flying capacitor converter with reduced DC bus capacitance Authors: Ghias, A.M.Y.M.; Ciobotaru, M.; Agelidis, Vassilios; Pou Félix, Josep Abstract: Due to extensive research, advanced voltage source converter (VSC) such as multilevel and multi-module have been proposed for high power applications. These advanced VSCs must provide secure as well as, intelligent power management operation for the future electricity network under various grid events. The focus of this paper is to evaluate the dynamic performance of a back-to-back five-level flying capacitor (FC) converter system with reduced DC bus capacitance under different grid voltage disturbances. The system uses a classical synchronous reference frame control technique for active/reactive power control and DC voltage regulation, and is tested in terms of general grid events such as power flow reversal, voltage amplitude excursions, phase jumps and frequency variations using MATLAB/Simulink and PLECS blockset. The simulation results show that the back-to-back FC converter with reduced DC bus capacitance performs well during the mentioned grid events. Thu, 09 May 2013 10:53:47 GMT http://hdl.handle.net/2117/19146 2013-05-09T10:53:47Z Ghias, A.M.Y.M.; Ciobotaru, M.; Agelidis, Vassilios; Pou Félix, Josep no Analysis and Simulations, FC converter, Grid Conditions, Grid voltage disturbances, Multilevel converter, Power Quality Due to extensive research, advanced voltage source converter (VSC) such as multilevel and multi-module have been proposed for high power applications. These advanced VSCs must provide secure as well as, intelligent power management operation for the future electricity network under various grid events. The focus of this paper is to evaluate the dynamic performance of a back-to-back five-level flying capacitor (FC) converter system with reduced DC bus capacitance under different grid voltage disturbances. The system uses a classical synchronous reference frame control technique for active/reactive power control and DC voltage regulation, and is tested in terms of general grid events such as power flow reversal, voltage amplitude excursions, phase jumps and frequency variations using MATLAB/Simulink and PLECS blockset. The simulation results show that the back-to-back FC converter with reduced DC bus capacitance performs well during the mentioned grid events. http://hdl.handle.net/2117/19145 Title: Performance evaluation of a five-level flying capacitor converter with reduced DC bus capacitance under two different modulation schemes Authors: Ghias, A.M.Y.M.; Pou Félix, Josep; Ciobotaru, M.; Agelidis, Vassilios Abstract: In flying capacitor (FC) converters, phase-shifted pulse-width modulation (PS-PWM) provides natural voltage balancing. However, for a practical application, a more robust balancing mechanism of maintaining the FC voltages at the desired values is required. This paper proposes a new closed-loop voltage balancing method for multilevel FC converters using PSPWM. The proposed method balances the voltages of the FCs by modifying the duty cycle of each switch of the FC converter using a proportional (P) controller. The crossed effect between FC currents and duty cycles is considered and is used for FC voltage balancing. The Simulation results verify that the proposed voltage balancing method is very robust to different operating conditions, such as load transients and non-linear loads. Thu, 09 May 2013 10:39:17 GMT http://hdl.handle.net/2117/19145 2013-05-09T10:39:17Z Ghias, A.M.Y.M.; Pou Félix, Josep; Ciobotaru, M.; Agelidis, Vassilios no AC/DC converter, back-to-back system, DC/AC converter, FC multilevel converter, PD-PWM, PS-PWM, reduced DC-link capacitor, voltage balancing strategy In flying capacitor (FC) converters, phase-shifted pulse-width modulation (PS-PWM) provides natural voltage balancing. However, for a practical application, a more robust balancing mechanism of maintaining the FC voltages at the desired values is required. This paper proposes a new closed-loop voltage balancing method for multilevel FC converters using PSPWM. The proposed method balances the voltages of the FCs by modifying the duty cycle of each switch of the FC converter using a proportional (P) controller. The crossed effect between FC currents and duty cycles is considered and is used for FC voltage balancing. The Simulation results verify that the proposed voltage balancing method is very robust to different operating conditions, such as load transients and non-linear loads. http://hdl.handle.net/2117/18628 Title: Voltage balancing method for the multilevel flying capacitor converter using phase-shifted PWM Authors: Ghias, A.M.Y.M.; Pou Félix, Josep; Ciobotaru, M.; Agelidis, Vassilios Abstract: n flying capacitor (FC) converters, phase-shifted pulse-width modulation (PS-PWM) provides natural voltage balancing. However, for a practical application, a more robust balancing mechanism of maintaining the FC voltages at the desired values is required. This paper proposes a new closed-loop voltage balancing method for multilevel FC converters using PS-PWM. The proposed method balances the voltages of the FCs by modifying the duty cycle of each switch of the FC converter using a proportional (P) controller. The crossed effect between FC currents and duty cycles is considered and is used for FC voltage balancing. The Simulation results verify that the proposed voltage balancing method is very robust to different operating conditions, such as load transients and non-linear loads. Fri, 05 Apr 2013 08:17:21 GMT http://hdl.handle.net/2117/18628 2013-04-05T08:17:21Z Ghias, A.M.Y.M.; Pou Félix, Josep; Ciobotaru, M.; Agelidis, Vassilios no Capacitor voltage balancing, Flying capacitor (FC) converter, Multilevel converter, Phase-shifted pulse width modulation (PS-PWM) n flying capacitor (FC) converters, phase-shifted pulse-width modulation (PS-PWM) provides natural voltage balancing. However, for a practical application, a more robust balancing mechanism of maintaining the FC voltages at the desired values is required. This paper proposes a new closed-loop voltage balancing method for multilevel FC converters using PS-PWM. The proposed method balances the voltages of the FCs by modifying the duty cycle of each switch of the FC converter using a proportional (P) controller. The crossed effect between FC currents and duty cycles is considered and is used for FC voltage balancing. The Simulation results verify that the proposed voltage balancing method is very robust to different operating conditions, such as load transients and non-linear loads. http://hdl.handle.net/2117/18544 Title: Self-video recording for the integration and assessment of generic competencies Authors: Masip Álvarez, Albert; Hervada Sala, Carme; Pàmies Gómez, Teresa; Arias Pujol, Antoni; Jaen Fernandez, Carles; Rodríguez Sorigué, M. Cristina; Romero Durán, David; Nejjari Akhi-Elarab, Fatiha; Álvarez del Castillo, María Dolores; Roca Lefler, Marta; Hernández Farràs, Jorge; Montferrer Liñan, Raul Abstract: This document presents the use of a self-video-recording service for the integration and assessment of certain generic competences (oral and written communication, teamwork and third (English) language) in all degree programs related to the Industrial area at the Terrassa School of Engineering (EET). The resulting service allows to carry out the assessment through active and collaborative learning methodologies using ICT as a support, becoming an educational resource where students are encouraged to evaluate their own activity, individually and in groups (co-evaluation), and with which the faculty can enhance certain sections of the syllabus while also evaluating generic competences. This paper outlines the rationale and design of the system based on self-recording-video that assists work on some generic competences. A preliminary experience has taken place and it has been carried out by volunteer students and some professors from the promoting team. It consisted of following all steps to obtain the video-recording as a result and fulfil the further assessment. Preparing the defence of the final project career, explaining the way a problem is faced are examples of use of the service endowed to assist the assessment of some generic competences. A good number of students and professors have participated in this preliminary experiment carried out on some subjects and in which oral effective communication will be assessed. A specific rubric for the assessment of generic competences has been used both for students and faculty. There is a summary of qualitative feedback from both students and instructors, and where several issues related to improving the self-assessment and self-video-recording system, are discussed. Finally, a survey is proposed, whose results will be helpful for its improvement. Tue, 02 Apr 2013 14:02:57 GMT http://hdl.handle.net/2117/18544 2013-04-02T14:02:57Z Masip Álvarez, Albert; Hervada Sala, Carme; Pàmies Gómez, Teresa; Arias Pujol, Antoni; Jaen Fernandez, Carles; Rodríguez Sorigué, M. Cristina; Romero Durán, David; Nejjari Akhi-Elarab, Fatiha; Álvarez del Castillo, María Dolores; Roca Lefler, Marta; Hernández Farràs, Jorge; Montferrer Liñan, Raul no This document presents the use of a self-video-recording service for the integration and assessment of certain generic competences (oral and written communication, teamwork and third (English) language) in all degree programs related to the Industrial area at the Terrassa School of Engineering (EET). The resulting service allows to carry out the assessment through active and collaborative learning methodologies using ICT as a support, becoming an educational resource where students are encouraged to evaluate their own activity, individually and in groups (co-evaluation), and with which the faculty can enhance certain sections of the syllabus while also evaluating generic competences. This paper outlines the rationale and design of the system based on self-recording-video that assists work on some generic competences. A preliminary experience has taken place and it has been carried out by volunteer students and some professors from the promoting team. It consisted of following all steps to obtain the video-recording as a result and fulfil the further assessment. Preparing the defence of the final project career, explaining the way a problem is faced are examples of use of the service endowed to assist the assessment of some generic competences. A good number of students and professors have participated in this preliminary experiment carried out on some subjects and in which oral effective communication will be assessed. A specific rubric for the assessment of generic competences has been used both for students and faculty. There is a summary of qualitative feedback from both students and instructors, and where several issues related to improving the self-assessment and self-video-recording system, are discussed. Finally, a survey is proposed, whose results will be helpful for its improvement. http://hdl.handle.net/2117/18075 Title: Hybrid modulator for power converters in parallel topology Authors: Mon González, Juan; González Díez, David; Balcells Sendra, Josep; Gago Barrio, Javier; Bogónez Franco, Francisco Abstract: This paper presents a new mixed modulator that combines interleaving and spread-spectrum techniques in order to achieve the lowest level of conducted EMI generation. This modulator is addressed to power converters in parallel arrangement. The practical details of the hybrid modulator and controller implementation on a FPGA are explained. The charac teristics of such modulator in terms of EMI reduction and converter performance are theoretically explored and experimentally validated in a four channel parallel buck converter operating in closed loop. Tue, 05 Mar 2013 15:16:04 GMT http://hdl.handle.net/2117/18075 2013-03-05T15:16:04Z Mon González, Juan; González Díez, David; Balcells Sendra, Josep; Gago Barrio, Javier; Bogónez Franco, Francisco no This paper presents a new mixed modulator that combines interleaving and spread-spectrum techniques in order to achieve the lowest level of conducted EMI generation. This modulator is addressed to power converters in parallel arrangement. The practical details of the hybrid modulator and controller implementation on a FPGA are explained. The charac teristics of such modulator in terms of EMI reduction and converter performance are theoretically explored and experimentally validated in a four channel parallel buck converter operating in closed loop. http://hdl.handle.net/2117/17810 Title: Reducing the sampling frequency for the control of the switched reluctance machine Authors: Rain, Xavier; Hilairet, Mickael; Arias Pujol, Antoni Abstract: This paper presents two solutions for dramatically reduce the sampling frequency and therefore the CPU demand while keeping the same performance in terms of torque ripple and efficiency on a SRM. The problem of a low sampling frequency with a regular control is first highlighted. Then, two different solutions are proposed for the self switching's function. Such solutions tries to magnetize the stator phase at an accurate instant in order to reduce the inherent torque ripple. Simulations results on a 8/6 SRM corroborate the validity of the proposed solutions and show the improvements of its performance. Mon, 18 Feb 2013 10:03:07 GMT http://hdl.handle.net/2117/17810 2013-02-18T10:03:07Z Rain, Xavier; Hilairet, Mickael; Arias Pujol, Antoni no This paper presents two solutions for dramatically reduce the sampling frequency and therefore the CPU demand while keeping the same performance in terms of torque ripple and efficiency on a SRM. The problem of a low sampling frequency with a regular control is first highlighted. Then, two different solutions are proposed for the self switching's function. Such solutions tries to magnetize the stator phase at an accurate instant in order to reduce the inherent torque ripple. Simulations results on a 8/6 SRM corroborate the validity of the proposed solutions and show the improvements of its performance. http://hdl.handle.net/2117/17696 Title: Hard-less common mode active EMI filter Authors: Pérez Robles, Daniel; González Díez, David; Mon González, Juan; Balcells Sendra, Josep; Gil Galí, Ignacio; Gago Barrio, Javier; Bogónez Franco, Francisco Abstract: Active EMI filters appear as an alternative to classical EMI filters based on passive components. Active EMI filters can provide more compact, cheaper and lighter solutions than passive approach. In this paper we present a theoretical analysis of the 4 possible configurations. Expressions of the transfer function and insertion losses considering impedances of mains and source of noise are presented. The voltage-current topology is identified as the more convenient solution. Finally, preliminary experimental results of a prototype capable to provide attenuation up to 100MHz are shown. Wed, 13 Feb 2013 08:58:39 GMT http://hdl.handle.net/2117/17696 2013-02-13T08:58:39Z Pérez Robles, Daniel; González Díez, David; Mon González, Juan; Balcells Sendra, Josep; Gil Galí, Ignacio; Gago Barrio, Javier; Bogónez Franco, Francisco no Active EMI filters appear as an alternative to classical EMI filters based on passive components. Active EMI filters can provide more compact, cheaper and lighter solutions than passive approach. In this paper we present a theoretical analysis of the 4 possible configurations. Expressions of the transfer function and insertion losses considering impedances of mains and source of noise are presented. The voltage-current topology is identified as the more convenient solution. Finally, preliminary experimental results of a prototype capable to provide attenuation up to 100MHz are shown. http://hdl.handle.net/2117/17685 Title: Extracurricular learning program for professional skills development in engineering schools Authors: González Díez, David; Griful Ponsati, Eulàlia; Mudarra López, Miguel; Serrano Maestre, Maria del Pilar Abstract: This paper presents an extracurricular program called INSPIRE3 that has been implemented by the ETSEIAT (Escola Tècnica Superior d'Enginyeries Industrial i Aeronàutica de Terrassa), a center belonging to the UPC-BarcelonaTech (Universitat Politècnica de Catalunya). This program is mainly addressed to facilitate cross-curricular skills and abilities development among students through collaborative-project based learning. The projection of an attractive external image of engineering degrees offered by ETSEIAT in order to increase the enrollment in such degrees is a secondary goal of this program. Under INSPIRE3, several real, challenging and multidisciplinary engineering projects are currently under development. In this paper, INSPIRE3 motivation, program management and implementation process are described and a short description of projects under development is given as well Tue, 12 Feb 2013 17:45:16 GMT http://hdl.handle.net/2117/17685 2013-02-12T17:45:16Z González Díez, David; Griful Ponsati, Eulàlia; Mudarra López, Miguel; Serrano Maestre, Maria del Pilar no This paper presents an extracurricular program called INSPIRE3 that has been implemented by the ETSEIAT (Escola Tècnica Superior d'Enginyeries Industrial i Aeronàutica de Terrassa), a center belonging to the UPC-BarcelonaTech (Universitat Politècnica de Catalunya). This program is mainly addressed to facilitate cross-curricular skills and abilities development among students through collaborative-project based learning. The projection of an attractive external image of engineering degrees offered by ETSEIAT in order to increase the enrollment in such degrees is a secondary goal of this program. Under INSPIRE3, several real, challenging and multidisciplinary engineering projects are currently under development. In this paper, INSPIRE3 motivation, program management and implementation process are described and a short description of projects under development is given as well http://hdl.handle.net/2117/17683 Title: Voltage balancing scheme for the multilevel flying capacitor converter using phase-shifted PWM Authors: Ghias, Amer M.Y.M; Pou Félix, Josep; Ciobotaru, M.; Agelidis, Vassilios Abstract: In flying capacitor (FC) converters, phase-shifted pulse-width modulation (PS-PWM) provides natural voltage balancing. However, for a practical application, a more robust balancing mechanism of maintaining the FC voltages at the desired values is required. This paper proposes a new closed-loop voltage balancing method for multilevel FC converters using PS-PWM. The proposed method balances the voltages of the FCs by modifying the duty cycle of each switch of the FC converter using a proportional (P) controller. The crossed effect between FC currents and duty cycles is considered and is used for FC voltage balancing. The Simulation results verify that the proposed voltage balancing method is very robust to different operating conditions, such as load transients and non-linear loads. Tue, 12 Feb 2013 17:31:54 GMT http://hdl.handle.net/2117/17683 2013-02-12T17:31:54Z Ghias, Amer M.Y.M; Pou Félix, Josep; Ciobotaru, M.; Agelidis, Vassilios no In flying capacitor (FC) converters, phase-shifted pulse-width modulation (PS-PWM) provides natural voltage balancing. However, for a practical application, a more robust balancing mechanism of maintaining the FC voltages at the desired values is required. This paper proposes a new closed-loop voltage balancing method for multilevel FC converters using PS-PWM. The proposed method balances the voltages of the FCs by modifying the duty cycle of each switch of the FC converter using a proportional (P) controller. The crossed effect between FC currents and duty cycles is considered and is used for FC voltage balancing. The Simulation results verify that the proposed voltage balancing method is very robust to different operating conditions, such as load transients and non-linear loads. http://hdl.handle.net/2117/17682 Title: Voltage balancing of a five-level flying capacitor converter using optimum switching transitions Authors: Ghias, Amer M.Y.M; Pou Félix, Josep; Ciobotaru, M.; Agelidis, Vassilios Abstract: The flying capacitor (FC) multilevel converter requires a capacitor voltage balancing mechanism for proper operation. This paper proposes a voltage balancing scheme for a five-level FC converter based on phase disposition pulse-width modulation (PD-PWM) using transitions that produce the minimum number of switching events. This strategy will be called optimal-transition voltage balancing (OTVB) scheme. Since multiple optimum switching transitions between two consecutive voltage levels may be available, such a redundancy is used to regulate the FC voltages at their desired levels. Those transitions that produce more switching events are avoided. The rest of transitions are evaluated by means of a cost function and the one that produces the minimum value is selected. Simulation results show a significant reduction of the average switching frequency as compared to the use of the optimal-state voltage balancing (OSVB) scheme, while maintaining the balance of the FC voltages. Moreover, the proposed PD-PWM voltage balancing strategy is robust to static and dynamic load conditions. Tue, 12 Feb 2013 17:16:52 GMT http://hdl.handle.net/2117/17682 2013-02-12T17:16:52Z Ghias, Amer M.Y.M; Pou Félix, Josep; Ciobotaru, M.; Agelidis, Vassilios no The flying capacitor (FC) multilevel converter requires a capacitor voltage balancing mechanism for proper operation. This paper proposes a voltage balancing scheme for a five-level FC converter based on phase disposition pulse-width modulation (PD-PWM) using transitions that produce the minimum number of switching events. This strategy will be called optimal-transition voltage balancing (OTVB) scheme. Since multiple optimum switching transitions between two consecutive voltage levels may be available, such a redundancy is used to regulate the FC voltages at their desired levels. Those transitions that produce more switching events are avoided. The rest of transitions are evaluated by means of a cost function and the one that produces the minimum value is selected. Simulation results show a significant reduction of the average switching frequency as compared to the use of the optimal-state voltage balancing (OSVB) scheme, while maintaining the balance of the FC voltages. Moreover, the proposed PD-PWM voltage balancing strategy is robust to static and dynamic load conditions. http://hdl.handle.net/2117/17679 Title: Voltage balancing strategy for a five-level flying capacitor converter using phase disposition PWM with sawtooth-shaped arriers Authors: Ghias, Amer M.Y.M; Pou Félix, Josep; Ciobotaru, M.; Agelidis, Vassilios Abstract: The flying capacitor (FC) multilevel converter has attracted a great deal of interest in the recent years because of its easier extension to a higher number of levels (n>;3), as compared to its counterpart, the diode-clamped converter (DCC). The main focus of this paper is to develop a voltage balancing scheme of FCs for a five-level FC converter based on phase disposition pulse-width modulation (PD-PWM). Since there are multiple states that produce the same output voltage at the leg of the converter, such a redundancy is used to regulate the FC voltages at their desired levels. The selection of the optimal states is performed by minimizing a cost function. A drawback observed when using standard symmetrical triangular carriers for the PD-PWM, is the additional switching events that are produced due to transitions within the same voltage level. Nevertheless, this fact can be avoided by using sawtooth carrier waveforms instead. Simulation results verify the robustness of the proposed voltage balancing scheme against static and dynamic load conditions. Moreover, using sawtooth carriers a significant reduction of the switching frequency is achieved as compared to the use of standard triangle carriers while maintaining the FC voltage balanced. Tue, 12 Feb 2013 17:00:02 GMT http://hdl.handle.net/2117/17679 2013-02-12T17:00:02Z Ghias, Amer M.Y.M; Pou Félix, Josep; Ciobotaru, M.; Agelidis, Vassilios no The flying capacitor (FC) multilevel converter has attracted a great deal of interest in the recent years because of its easier extension to a higher number of levels (n>;3), as compared to its counterpart, the diode-clamped converter (DCC). The main focus of this paper is to develop a voltage balancing scheme of FCs for a five-level FC converter based on phase disposition pulse-width modulation (PD-PWM). Since there are multiple states that produce the same output voltage at the leg of the converter, such a redundancy is used to regulate the FC voltages at their desired levels. The selection of the optimal states is performed by minimizing a cost function. A drawback observed when using standard symmetrical triangular carriers for the PD-PWM, is the additional switching events that are produced due to transitions within the same voltage level. Nevertheless, this fact can be avoided by using sawtooth carrier waveforms instead. Simulation results verify the robustness of the proposed voltage balancing scheme against static and dynamic load conditions. Moreover, using sawtooth carriers a significant reduction of the switching frequency is achieved as compared to the use of standard triangle carriers while maintaining the FC voltage balanced. http://hdl.handle.net/2117/17677 Title: Minimization of the capacitor voltage fluctuations of a modular multilevel converter by circulating current control Authors: Picas Prat, Ricard; Pou Félix, Josep; Ceballos Recio, Salvador; Agelidis, Vassilios; Saeedifard, Maryam Abstract: The modular multilevel converter (MMC) is one of the most potential converter topologies for medium/high power/voltage applications. One of the main technical challenges of an MMC is to eliminate/minimize the circulating currents within the legs. Circulating currents, if not properly controlled, increase the amplitude of capacitor voltage variations, rating values of the converter components and converter losses. This paper proposes a closed-loop circulating current control strategy for an MMC to specifically minimize the amplitude of capacitor voltage variations. The proposed strategy is based on adding an offset signal to the modulating signal of each arm. To minimize the amplitude of the capacitor voltage oscillations, an optimal circulating current component is determined and used as a reference signal for the current control of each MMC leg. Performance of the proposed control strategy is evaluated based on simulation studies in the MATLAB/Simulink environment. The reported study results demonstrate effectiveness of the proposed strategy to reduce the amplitude of the capacitor voltage oscillations. Tue, 12 Feb 2013 16:44:06 GMT http://hdl.handle.net/2117/17677 2013-02-12T16:44:06Z Picas Prat, Ricard; Pou Félix, Josep; Ceballos Recio, Salvador; Agelidis, Vassilios; Saeedifard, Maryam no The modular multilevel converter (MMC) is one of the most potential converter topologies for medium/high power/voltage applications. One of the main technical challenges of an MMC is to eliminate/minimize the circulating currents within the legs. Circulating currents, if not properly controlled, increase the amplitude of capacitor voltage variations, rating values of the converter components and converter losses. This paper proposes a closed-loop circulating current control strategy for an MMC to specifically minimize the amplitude of capacitor voltage variations. The proposed strategy is based on adding an offset signal to the modulating signal of each arm. To minimize the amplitude of the capacitor voltage oscillations, an optimal circulating current component is determined and used as a reference signal for the current control of each MMC leg. Performance of the proposed control strategy is evaluated based on simulation studies in the MATLAB/Simulink environment. The reported study results demonstrate effectiveness of the proposed strategy to reduce the amplitude of the capacitor voltage oscillations. http://hdl.handle.net/2117/17675 Title: Solid State Transformer Based on the Flying Capacitor Multilevel Converter for Intelligent Power Management Authors: Ghias, Amer M.Y.M; Ciobotaru, M.; Agelidis, Vassilios; Pou Félix, Josep Abstract: Future grids will consist of large scale of integration of both renewable and other distributed energy sources. Therefore, advanced power electronics converters for critical loads will be needed in order to enhance power quality, and to ensure proper and secure operation of future grids. These power converters must be able to provide intelligent power management as well as ancillary services. This paper proposes a solid state transformer (SST) which consists of medium frequency transformer and threelevel flying capacitor (FC) topology for intelligent power management. It is tested under various grid events such as voltage excursions, phase jumps and frequency variations. Moreover, it is tested against load disturbances such as load transients and nonlinear loads. The SST enhances power quality compatibility and provides good isolation of perturbances between the grid and the loads. The SST is also able to deliver ride through capabilities, which can isolate short term disturbances from the grid to the loads and vice-versa. The Power quality enhancement features are validated under various source and load conditions using computer simulation. Tue, 12 Feb 2013 16:29:59 GMT http://hdl.handle.net/2117/17675 2013-02-12T16:29:59Z Ghias, Amer M.Y.M; Ciobotaru, M.; Agelidis, Vassilios; Pou Félix, Josep no Future grids will consist of large scale of integration of both renewable and other distributed energy sources. Therefore, advanced power electronics converters for critical loads will be needed in order to enhance power quality, and to ensure proper and secure operation of future grids. These power converters must be able to provide intelligent power management as well as ancillary services. This paper proposes a solid state transformer (SST) which consists of medium frequency transformer and threelevel flying capacitor (FC) topology for intelligent power management. It is tested under various grid events such as voltage excursions, phase jumps and frequency variations. Moreover, it is tested against load disturbances such as load transients and nonlinear loads. The SST enhances power quality compatibility and provides good isolation of perturbances between the grid and the loads. The SST is also able to deliver ride through capabilities, which can isolate short term disturbances from the grid to the loads and vice-versa. The Power quality enhancement features are validated under various source and load conditions using computer simulation. http://hdl.handle.net/2117/17674 Title: Impact of temperature on the electromagnetic compatibility susceptibility of operational amplifiers Authors: Fernández García, Raúl; Gil Galí, Ignacio Abstract: In this paper the impact of temperature on the electromagnetic susceptibility of operational amplifiers at different frequencies is presented. The IEC 62132-4 direct power injection standard has been used with several commercials operational amplifiers in a printed circuit board specifically fabricated. The results show that the susceptibility of the operationals amplifier is reduced with the temperature. Tue, 12 Feb 2013 16:21:44 GMT http://hdl.handle.net/2117/17674 2013-02-12T16:21:44Z Fernández García, Raúl; Gil Galí, Ignacio no In this paper the impact of temperature on the electromagnetic susceptibility of operational amplifiers at different frequencies is presented. The IEC 62132-4 direct power injection standard has been used with several commercials operational amplifiers in a printed circuit board specifically fabricated. The results show that the susceptibility of the operationals amplifier is reduced with the temperature. http://hdl.handle.net/2117/17667 Title: Validation of EMI model for matrix converters Authors: Espina Masramon, Jorge; Balcells Sendra, Josep; Arias Pujol, Antoni; Ortega García, Carlos; González Díez, David; Gago Barrio, Javier Abstract: This paper is focused on the validation of a previously presented method to obtain conducted EMI in direct matrix converters (MC). Such model is based on a frequency domain equivalent circuit, which is applied to two different prototypes of MC in order to validate such method. This paper starts with a review of the EMI method and follows obtaining the equivalent circuit. The experimental part consists of a comparison between EMI simulation results and measured EMI in two different MC. Finally, the paper includes a discussion on the method generalisation. Tue, 12 Feb 2013 15:22:20 GMT http://hdl.handle.net/2117/17667 2013-02-12T15:22:20Z Espina Masramon, Jorge; Balcells Sendra, Josep; Arias Pujol, Antoni; Ortega García, Carlos; González Díez, David; Gago Barrio, Javier no This paper is focused on the validation of a previously presented method to obtain conducted EMI in direct matrix converters (MC). Such model is based on a frequency domain equivalent circuit, which is applied to two different prototypes of MC in order to validate such method. This paper starts with a review of the EMI method and follows obtaining the equivalent circuit. The experimental part consists of a comparison between EMI simulation results and measured EMI in two different MC. Finally, the paper includes a discussion on the method generalisation.