Jorge Lara | UAM Azcaptzalco (original) (raw)
Papers by Jorge Lara
Energies, 2021
This paper presents a novel single-phase grid-tied neutral-point-clamped (NPC) five-level convert... more This paper presents a novel single-phase grid-tied neutral-point-clamped (NPC) five-level converter (SPFLC). Unlike the literature on five-level NPC topologies, the proposed one is capable of inherently balancing the voltage of the DC-link split capacitors. For this purpose, a simple Multicarrier Phase Disposition (MPD) Pulse Width Modulation (PWM) technique is used, thus avoiding both complex modifications to the Space Vector Modulation (SVM) and offset voltage injections into the carrier based (CB) PWM, as commonly done in most conventional balancing algorithms. Bearing in mind that the proposed balancing strategy only requires measuring the capacitors’ voltages and the sign of the converter output current, it has a very low complexity. The developed strategy is not only straightforwardly implemented but is also very effective for obtaining symmetrical and undistorted voltage levels from the proposed multilevel converter, as well as for significantly improving the power quality of...
Energies, 2021
This paper presents a novel single-phase (SP) active-neutral point clamped (ANPC) five-level bidi... more This paper presents a novel single-phase (SP) active-neutral point clamped (ANPC) five-level bidirectional converter (FLBC) for enhancing the power quality (PQ) during the grid-to-vehicle (G2V) and vehicle-to-grid (V2G) operation of an electric vehicle (EV) charger connected in series. This EV charger is based on a dual-active half-bridge DC-DC converter (DAHBC) with a high frequency isolation transformer. Unlike the comparable ANPC topologies found in literature, the proposed one has two more switches, i.e., ten instead of eight. However, with the addition of these components, the proposed multilevel converter not only becomes capable of properly balancing the voltage of the DC-link split capacitors under various step-changing conditions but it achieves a better efficiency, a lower stress of the switching devices and a more even distribution of the power losses. The resulting grid-tied ANPC-SPFLBC and DAHBC are accurately controlled with a cascaded control strategy and a single-pha...
IEEE Transactions on Industrial Electronics, 2016
This paper analyzes the effects of the rotor position error in the performance of Field Oriented ... more This paper analyzes the effects of the rotor position error in the performance of Field Oriented Controlled (FOC) Permanent Magnet Synchronous Machine (PMSM) Drives intended for Electric Vehicle (EV) traction applications. A special focus is given to the torque ripple generated along the characteristic trajectories in the different operating regions of the PMSM. An extended and generalized model of the torque ripple produced by the PMSM as a function of the rotor position error is analytically deduced. An infinite-speed Interior (I)-PMSM drive and a finite-speed Surface Mounted (SM)-PMSM drive are considered for the simulations carried out in MATLAB-SimPowerSystems. The experimental results have been validated with a TM4 EV drive controlling an 80KW (SM)-PMSM. The torque ripple has been evaluated for both motoring and regenerative braking operation modes under maximum torque conditions going from 100Nm at 1,000 rpm up to 55Nm at 9,000 rpm. The obtained simulation and experimental results demonstrate the good accuracy of the proposed model for evaluating the torque ripple produced in PMSMs due to the error from the rotor position sensor. Index Terms-Rotor position error, field oriented control (FOC), torque ripple, permanent magnet synchronous machine (PMSM), electric vehicle (EV).
IEEE Transactions on Industrial Electronics, 2017
This paper investigates the performance of two novel Half Switching Frequency Signal Injection (H... more This paper investigates the performance of two novel Half Switching Frequency Signal Injection (HSFSI) demodulation algorithms for encoderless Field Oriented Control (FOC) of Permanent Magnet Synchronous Machines (PMSMs) intended for Electric Vehicle (EV) propulsion. The proposed rotating and pulsating HSFSI demodulation algorithms do not require voltage measurements or approximations for estimating the rotor position angle. The proposed HSFSI algorithms have been quantitatively and qualitatively compared by MATLAB-SimPowerSystems simulations as well as experimentally against the two equivalent classical High Frequency Signal Injection (HFSI) approaches. A 2.5kW PMSM with radially inset rotor magnets has been used for experimentally evaluating and validating the performance analysis and the comparison of the four algorithms fully implemented to work in real-time on a TI C2000 Digital Signal Processor (DSP). The results obtained with an 80kW Interior (I)-PMSM intended for EV propulsion also show that the proposed algorithms allow a better machine control performance in terms of a smaller torque ripple generation and a faster current control loop. Index Terms-Electric vehicle (EV), encoderless control, high frequency signal injection (HFSI), permanent magnet synchronous machine (PMSM). Jorge Lara (M'08) received the B.E. degree in Electronics and Communications from the Faculty of Mechanical, Electrical, and Electronic Engineering (FIMEE) and the M.S. degree in Electrical Engineering from the
IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society, 2014
This paper analyses the position error compensation in quadrature analog magnetic encoders throug... more This paper analyses the position error compensation in quadrature analog magnetic encoders through the iterative linear search optimization algorithm of "steepest descent". In current literature, the sine/cosine signals from the encoder are compensated considering only the gain mismatch, the DC offset components and the non-orthogonality. Nevertheless, the magnetic field distortion due to the non-homogeneity of the magnet and the distortion of the signals due to the mechanical misalignment between the rotation axis of the motor shaft, the magnet center and the chip sensor are generally neglected. In this work, all of these factors are taken into account. The results show that a higher order approximation for modeling the harmonic distortion contained in the encoder signals leads to a slight biasing in the convergence of the compensating parameters. However, the unconstrained and multivariate optimization algorithm of steepest descent fairly minimizes the error from the objective function F(xn) allowing achieve a compensation efficiency of up to 66%, thus increasing the overall accuracy of this kind of magnetic encoders and improving the performance of any application where they provide rotary position feedback.
Semina: Ciências Agrárias, 2003
A crescente exigência dos mercados consumidores por produtos cárneos de qualidade e com segurança... more A crescente exigência dos mercados consumidores por produtos cárneos de qualidade e com segurança vem exigindo do setor produtivo uma contínua adaptação. A rastreabilidade vem de encontro com esta perspectiva, uma vez que integra toda a cadeia produtiva em um sistema de monitoramento e certificação. Entretanto, a desigualdade da capacitação técnica existente nos componentes envolvidos em cada etapa do processo presentes nacionalmente é um desafio a ser vencido. A rastreabilidade é na atualidade um pré-requisito para o setor na conquista de novos mercados. Discute-se neste artigo, portanto, as ações da inspeção federal e do setor produtivo para atender as demandas dos consumidores com ênfase as da comunidade européia.
Energies, 2021
This paper presents a novel single-phase grid-tied neutral-point-clamped (NPC) five-level convert... more This paper presents a novel single-phase grid-tied neutral-point-clamped (NPC) five-level converter (SPFLC). Unlike the literature on five-level NPC topologies, the proposed one is capable of inherently balancing the voltage of the DC-link split capacitors. For this purpose, a simple Multicarrier Phase Disposition (MPD) Pulse Width Modulation (PWM) technique is used, thus avoiding both complex modifications to the Space Vector Modulation (SVM) and offset voltage injections into the carrier based (CB) PWM, as commonly done in most conventional balancing algorithms. Bearing in mind that the proposed balancing strategy only requires measuring the capacitors’ voltages and the sign of the converter output current, it has a very low complexity. The developed strategy is not only straightforwardly implemented but is also very effective for obtaining symmetrical and undistorted voltage levels from the proposed multilevel converter, as well as for significantly improving the power quality of...
Energies, 2021
This paper presents a novel single-phase (SP) active-neutral point clamped (ANPC) five-level bidi... more This paper presents a novel single-phase (SP) active-neutral point clamped (ANPC) five-level bidirectional converter (FLBC) for enhancing the power quality (PQ) during the grid-to-vehicle (G2V) and vehicle-to-grid (V2G) operation of an electric vehicle (EV) charger connected in series. This EV charger is based on a dual-active half-bridge DC-DC converter (DAHBC) with a high frequency isolation transformer. Unlike the comparable ANPC topologies found in literature, the proposed one has two more switches, i.e., ten instead of eight. However, with the addition of these components, the proposed multilevel converter not only becomes capable of properly balancing the voltage of the DC-link split capacitors under various step-changing conditions but it achieves a better efficiency, a lower stress of the switching devices and a more even distribution of the power losses. The resulting grid-tied ANPC-SPFLBC and DAHBC are accurately controlled with a cascaded control strategy and a single-pha...
IEEE Transactions on Industrial Electronics, 2016
This paper analyzes the effects of the rotor position error in the performance of Field Oriented ... more This paper analyzes the effects of the rotor position error in the performance of Field Oriented Controlled (FOC) Permanent Magnet Synchronous Machine (PMSM) Drives intended for Electric Vehicle (EV) traction applications. A special focus is given to the torque ripple generated along the characteristic trajectories in the different operating regions of the PMSM. An extended and generalized model of the torque ripple produced by the PMSM as a function of the rotor position error is analytically deduced. An infinite-speed Interior (I)-PMSM drive and a finite-speed Surface Mounted (SM)-PMSM drive are considered for the simulations carried out in MATLAB-SimPowerSystems. The experimental results have been validated with a TM4 EV drive controlling an 80KW (SM)-PMSM. The torque ripple has been evaluated for both motoring and regenerative braking operation modes under maximum torque conditions going from 100Nm at 1,000 rpm up to 55Nm at 9,000 rpm. The obtained simulation and experimental results demonstrate the good accuracy of the proposed model for evaluating the torque ripple produced in PMSMs due to the error from the rotor position sensor. Index Terms-Rotor position error, field oriented control (FOC), torque ripple, permanent magnet synchronous machine (PMSM), electric vehicle (EV).
IEEE Transactions on Industrial Electronics, 2017
This paper investigates the performance of two novel Half Switching Frequency Signal Injection (H... more This paper investigates the performance of two novel Half Switching Frequency Signal Injection (HSFSI) demodulation algorithms for encoderless Field Oriented Control (FOC) of Permanent Magnet Synchronous Machines (PMSMs) intended for Electric Vehicle (EV) propulsion. The proposed rotating and pulsating HSFSI demodulation algorithms do not require voltage measurements or approximations for estimating the rotor position angle. The proposed HSFSI algorithms have been quantitatively and qualitatively compared by MATLAB-SimPowerSystems simulations as well as experimentally against the two equivalent classical High Frequency Signal Injection (HFSI) approaches. A 2.5kW PMSM with radially inset rotor magnets has been used for experimentally evaluating and validating the performance analysis and the comparison of the four algorithms fully implemented to work in real-time on a TI C2000 Digital Signal Processor (DSP). The results obtained with an 80kW Interior (I)-PMSM intended for EV propulsion also show that the proposed algorithms allow a better machine control performance in terms of a smaller torque ripple generation and a faster current control loop. Index Terms-Electric vehicle (EV), encoderless control, high frequency signal injection (HFSI), permanent magnet synchronous machine (PMSM). Jorge Lara (M'08) received the B.E. degree in Electronics and Communications from the Faculty of Mechanical, Electrical, and Electronic Engineering (FIMEE) and the M.S. degree in Electrical Engineering from the
IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society, 2014
This paper analyses the position error compensation in quadrature analog magnetic encoders throug... more This paper analyses the position error compensation in quadrature analog magnetic encoders through the iterative linear search optimization algorithm of "steepest descent". In current literature, the sine/cosine signals from the encoder are compensated considering only the gain mismatch, the DC offset components and the non-orthogonality. Nevertheless, the magnetic field distortion due to the non-homogeneity of the magnet and the distortion of the signals due to the mechanical misalignment between the rotation axis of the motor shaft, the magnet center and the chip sensor are generally neglected. In this work, all of these factors are taken into account. The results show that a higher order approximation for modeling the harmonic distortion contained in the encoder signals leads to a slight biasing in the convergence of the compensating parameters. However, the unconstrained and multivariate optimization algorithm of steepest descent fairly minimizes the error from the objective function F(xn) allowing achieve a compensation efficiency of up to 66%, thus increasing the overall accuracy of this kind of magnetic encoders and improving the performance of any application where they provide rotary position feedback.
Semina: Ciências Agrárias, 2003
A crescente exigência dos mercados consumidores por produtos cárneos de qualidade e com segurança... more A crescente exigência dos mercados consumidores por produtos cárneos de qualidade e com segurança vem exigindo do setor produtivo uma contínua adaptação. A rastreabilidade vem de encontro com esta perspectiva, uma vez que integra toda a cadeia produtiva em um sistema de monitoramento e certificação. Entretanto, a desigualdade da capacitação técnica existente nos componentes envolvidos em cada etapa do processo presentes nacionalmente é um desafio a ser vencido. A rastreabilidade é na atualidade um pré-requisito para o setor na conquista de novos mercados. Discute-se neste artigo, portanto, as ações da inspeção federal e do setor produtivo para atender as demandas dos consumidores com ênfase as da comunidade européia.