The Experts below are selected from a list of 19665 Experts worldwide ranked by ideXlab platform
Wenyi Liang - One of the best experts on this subject based on the ideXlab platform.
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An Improved Sideband Current Harmonic Model of Interior PMSM Drive by Considering Magnetic Saturation and Cross-Coupling Effects
IEEE Transactions on Industrial Electronics, 2016Co-Authors: Wenyi LiangAbstract:The sideband Current Harmonics, as parasitic characteristics in permanent-magnet synchronous machine (PMSM) drives with space vector pulsewidth modulation technique, will increase the corresponding electromagnetic loss, torque ripple, vibration, and acoustic noises. Therefore, fast yet accurate evaluation of the resultant sideband Current Harmonic components is of particular importance during the design stage of the drive system. However, the inevitable magnetic saturation and cross-coupling effects in interior PMSM drives would have a significant impact on the Current components, while the existing analytical sideband Current Harmonic model neglects those effects. This paper introduces a significant improvement on the analytical model by taking into account these effects with corresponding nonlinear factors. Experimental results are carried out to underpin the accuracy improvements of the predictions from the proposed model over the existing analytical one. The proposed model can offer a very detailed and insightful revelation of impacts of the magnetic saturation and cross-coupling effects on the corresponding sideband Current Harmonics.
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analytical modeling of Current Harmonic components in pmsm drive with voltage source inverter by svpwm technique
IEEE Transactions on Energy Conversion, 2014Co-Authors: Wenyi Liang, Jianfeng Wang, Weizhong FangAbstract:The sideband Current Harmonic components would inhere in permanent-magnet (PM) synchronous machine systems driven by a voltage-source inverter with space vector pulsewidth modulation (SVPWM). However, these Harmonics could potentially deteriorate the overall performance of the drive system by increasing the resultant losses, torque ripple, and electromagnetic and acoustic noises. The main sideband Harmonic voltages and Currents in PM synchronous machine driven by voltage-source inverter with SVPWM technique, are analytically derived and expressed in both stator and rotor frame. The experimental results are carried out to underpin the validity of the analytical model. The analytical model could be employed to assess the influencing factors of Current Harmonics. In addition, it offers insightful guidance to the effective reductions of Harmonic losses, torque ripples, and electromagnetic noises.
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Analytical Modeling of Sideband Current Harmonic Components in Induction Machine Drive With Voltage Source Inverter by an SVM Technique
IEEE Transactions on Power Electronics, 2013Co-Authors: Wenyi Liang, Jianfeng Wang, Weizhong FangAbstract:The sideband Current Harmonic components are practically inevitable in induction motor drive systems with voltage source inverter and pulse width modulation technique. However, those particular Harmonic components would increase the losses, torque ripple, and electromagnetic noise so as to deteriorate the overall performance of the electric machine. In this paper, the main sideband Current Harmonic components in induction machines driven by voltage source inverter with space vector pulse width modulation technique are analytically derived and expressed in both stator and synchronous dq reference frames, which could be employed as a rapid analytical tool to study the corresponding Harmonic losses, torque pulsations, and electromagnetic noises. The validity of the analytical models has been confirmed by the experimental results. Finally, both the load characteristics and impact factors on the sideband Current Harmonics in induction machine drives are comprehensively investigated and discussed based on the analytical models.
Weizhong Fang - One of the best experts on this subject based on the ideXlab platform.
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analytical modeling of Current Harmonic components in pmsm drive with voltage source inverter by svpwm technique
IEEE Transactions on Energy Conversion, 2014Co-Authors: Wenyi Liang, Jianfeng Wang, Weizhong FangAbstract:The sideband Current Harmonic components would inhere in permanent-magnet (PM) synchronous machine systems driven by a voltage-source inverter with space vector pulsewidth modulation (SVPWM). However, these Harmonics could potentially deteriorate the overall performance of the drive system by increasing the resultant losses, torque ripple, and electromagnetic and acoustic noises. The main sideband Harmonic voltages and Currents in PM synchronous machine driven by voltage-source inverter with SVPWM technique, are analytically derived and expressed in both stator and rotor frame. The experimental results are carried out to underpin the validity of the analytical model. The analytical model could be employed to assess the influencing factors of Current Harmonics. In addition, it offers insightful guidance to the effective reductions of Harmonic losses, torque ripples, and electromagnetic noises.
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Analytical Modeling of Sideband Current Harmonic Components in Induction Machine Drive With Voltage Source Inverter by an SVM Technique
IEEE Transactions on Power Electronics, 2013Co-Authors: Wenyi Liang, Jianfeng Wang, Weizhong FangAbstract:The sideband Current Harmonic components are practically inevitable in induction motor drive systems with voltage source inverter and pulse width modulation technique. However, those particular Harmonic components would increase the losses, torque ripple, and electromagnetic noise so as to deteriorate the overall performance of the electric machine. In this paper, the main sideband Current Harmonic components in induction machines driven by voltage source inverter with space vector pulse width modulation technique are analytically derived and expressed in both stator and synchronous dq reference frames, which could be employed as a rapid analytical tool to study the corresponding Harmonic losses, torque pulsations, and electromagnetic noises. The validity of the analytical models has been confirmed by the experimental results. Finally, both the load characteristics and impact factors on the sideband Current Harmonics in induction machine drives are comprehensively investigated and discussed based on the analytical models.
A. Tani - One of the best experts on this subject based on the ideXlab platform.
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reduction of the input Current Harmonic content in matrix converters under input output unbalance
IEEE Transactions on Industrial Electronics, 1998Co-Authors: D. Casadei, G. Serra, A. TaniAbstract:This paper deals with the performance evaluation of space-vector-modulated matrix power converters under input and output unbalanced conditions. Two control strategies of the input Current displacement angle are presented and compared in order to emphasize their influence on the input Current Harmonic content. The first is based on keeping the input Current vector in phase with the input voltage vector. In the second, the input Current displacement angle is dynamically modulated as a function of positive- and negative-sequence components of the input voltages. In both cases, the Harmonic content and the three-phase RMS value of the input Current have been evaluated analytically. The input Current Harmonic spectrum is quite different for the two control strategies and can be related to the input and output unbalance. It has been verified that, in the usual case of balanced output conditions, using the second method, it is possible to eliminate the Harmonic components of the input Current. Some numerical simulations are presented to confirm the analytical results.
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Reduction of the input Current Harmonic content in matrix converters under input/output unbalance
IEEE Transactions on Industrial Electronics, 1998Co-Authors: D. Casadei, G. Serra, A. TaniAbstract:This paper deals with the performance evaluation of space-vector-modulated matrix power converters under input and output unbalanced conditions. Two control strategies of the input Current displacement angle are presented and compared in order to emphasize their influence on the input Current Harmonic content. The first is based on keeping the input Current vector in phase with the input voltage vector. In the second, the input Current displacement angle is dynamically modulated as a function of positive- and negative-sequence components of the input voltages. In both cases, the Harmonic content and the three-phase RMS value of the input Current have been evaluated analytically. The input Current Harmonic spectrum is quite different for the two control strategies and can be related to the input and output unbalance. It has been verified that, in the usual case of balanced output conditions, using the second method, it is possible to eliminate the Harmonic components of the input Current. Some numerical simulations are presented to confirm the analytical results.
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a general approach for the analysis of the input power quality in matrix converters
Power Electronics Specialists Conference, 1996Co-Authors: D. Casadei, G. Serra, A. TaniAbstract:In this paper, a general approach based on a linearized analysis is employed in order to determine the matrix converter performance in terms of input-Current quality. Considering input disturbances such as voltage unbalance and voltage distortion as a linear deviation from the fundamental Harmonic component, it is possible to evaluate analytically the input-Current Harmonic content. It is emphasized that the input-Current frequency spectrum is affected by the input-Current modulation strategy employed. By using an optimal dynamic modulation strategy, it is possible to minimize the input-Current Harmonic content. Some numerical results are given to confirm the analytical solutions.
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reduction of the input Current Harmonic content in matrix converters under input output unbalance
Conference of the Industrial Electronics Society, 1995Co-Authors: D. Casadei, G. Serra, A. TaniAbstract:This paper deals with the performance evaluation of space vector modulation controlled matrix power converters under input and output unbalanced conditions. Two control strategies are presented and compared with reference to the input Current Harmonic content. The first strategy is based on keeping the input Current vector in phase with the input voltage vector. In the second strategy, the input Current vector is modulated along a direction depending on positive and negative sequence components of the input voltages. In both cases, the Harmonic content of the input Current has been evaluated analytically. It has been verified that the input Current Harmonic spectrum is quite different for the two control strategies and can be related to the input and output unbalance. Some numerical simulation are presented to confirm the analytical results.
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Reduction of the input Current Harmonic content in matrix converters under input/output unbalance
Proceedings of IECON '95 - 21st Annual Conference on IEEE Industrial Electronics, 1995Co-Authors: D. Casadei, G. Serra, A. TaniAbstract:This paper deals with the performance evaluation of space vector modulation controlled matrix power converters under input and output unbalanced conditions. Two control strategies are presented and compared with reference to the input Current Harmonic content. The first strategy is based on keeping the input Current vector in phase with the input voltage vector. In the second strategy, the input Current vector is modulated along a direction depending on positive and negative sequence components of the input voltages. In both cases, the Harmonic content of the input Current has been evaluated analytically. It has been verified that the input Current Harmonic spectrum is quite different for the two control strategies and can be related to the input and output unbalance. Some numerical simulation are presented to confirm the analytical results.
G. W. Jewell - One of the best experts on this subject based on the ideXlab platform.
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Torque Performance Improvement of Doubly Salient Synchronous Reluctance Machines by Current Harmonic Injection
2019 IEEE International Electric Machines & Drives Conference (IEMDC), 2019Co-Authors: K. Zhang, G. J. Li, G. W. JewellAbstract:In this paper, a Current Harmonic injection method is proposed for torque ripple reduction and/or average torque enhancement in 3-phase, 12-slot/8-pole single layer mutually coupled switched reluctance machines (MCSRMs), which are essentially doubly salient synchronous reluctance machines with sinewave Current supply. Initially, the torque generation mechanism with pure sinewave Current supply of MCSRMs is analyzed based on some analytical torque models with both self-and mutual-inductances consideration. These analytical models can accurately predict which inductance Harmonic(s) contribute to average torque and which contribute to torque ripple and to which extent their contribution will be. Using similar analytical torque models, the Current Harmonics (3rd, 5th, 7thetc.) can be injected to reduce the torque ripple and/or to increase the average torque. In addition, the Harmonic order, the amplitude and also the phase angle compared to the fundamental component can be calculated for achieving the minimum torque ripple or the maximum average torque. Both finite element simulations and static as well as dynamic tests have been carried out to prove the efficiency of the proposed Current Harmonic injection method.
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Losses in Different Doubly Salient Synchronous Reluctance Machines with Current Harmonic Injection
2019 22nd International Conference on Electrical Machines and Systems (ICEMS), 2019Co-Authors: K. Zhang, G. J. Li, R. Zhou, G. W. JewellAbstract:this paper investigates the losses in three typical types of doubly salient synchronous reluctance machines after adopting Current Harmonic (3rd, 5th or 7th) injection for performance improvement. These machines are evolved from switched reluctance machines with different winding configurations and supplied with sinewave Current. It is found that although the 3rd order Current Harmonic injection causes extra losses, the efficiency can still be increased due to significant improvement in average torque. However, the 5th and 7th order Current Harmonic injection could reduce the efficiency, due to reduced output power and higher iron losses.
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Dynamic Performance Investigation of Doubly Salient Synchronous Reluctance Machines with Current Harmonic Injection
2019 22nd International Conference on Electrical Machines and Systems (ICEMS), 2019Co-Authors: K. Zhang, G. J. Li, R. Zhou, G. W. JewellAbstract:A Current Harmonic injection method is adopted to improve the average torque and to reduce the torque ripple of a doubly salient synchronous reluctance machine. However, the interaction between the inductance Harmonics and the injected Current Harmonics will lead to non-negligible distortion in the voltage, which will influence machine's dynamic performance in the flux-weakening region. In order to predict such influence, the analytical torque model in dq-axis has been proposed in this paper to investigate the dynamic performance such as torque speed curve and efficiency map with Current Harmonic injection. It has been found that, for the same phase root-mean-square Current, although the 5th and 7th order Current Harmonics can reduce the torque ripple, they also cause significant voltage distortion and lead to deteriorated dynamic performance.
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Comparative Studies of Torque Performance Improvement for Different Doubly Salient Synchronous Reluctance Machines by Current Harmonic Injection
IEEE Transactions on Energy Conversion, 2019Co-Authors: G. J. Li, K. Zhang, G. W. JewellAbstract:A total of three types of doubly salient synchronous reluctance machines have been comparatively studied to improve the torque performance using Current Harmonic injection methods. These machines are derived from the switched reluctance machines (SRMs) with different winding configurations, such as the double/single-layer mutually coupled SRMs (MCSRMs) and fully pitched SRMs (FPSRMs), by supplying them with sinewave Current. Such Current supply mode can lead to higher torque/power density and lower vibrations and acoustic noise compared with the conventional rectangular Current supply. The proposed torque analytical model can predict the instantaneous torque of the doubly salient SRMs with sinewave Current excitation and the Current Harmonics also can be selected in order to reduce the torque ripple and/or increase the average torque. It has been found that the third Current Harmonic injection shows the best performance for single-layer MCSRMs and FPSRMs because it improves the average torque and reduces the torque ripple at the same time. However, it has little influence on doubly-layer MCSRMs. To improve the torque performance of such machines, other Harmonic Currents, e.g., fifth and seventh, need to be used. Both static and dynamic tests have been carried out to validate the predictions.
A Miraoui - One of the best experts on this subject based on the ideXlab platform.
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Current Harmonic compensation by a single phase shunt active power filter controlled by adaptive neural filtering
IEEE Transactions on Industrial Electronics, 2009Co-Authors: Maurizio Cirrincione, Marcello Pucci, Gianpaolo Vitale, A MiraouiAbstract:This paper presents a single-phase shunt active power filter (APF) for Current Harmonic compensation based on neural filtering. The shunt active filter, realized by a Current-controlled inverter, has been used to compensate a nonlinear Current load by receiving its reference from a neural adaptive notch filter. This is a recursive notch filter for the fundamental grid frequency (50 Hz) and is based on the use of a linear adaptive neuron (ADALINE). The filter's parameters are made adaptive with respect to the grid frequency fluctuations. A phase-locked loop system is used to extract the fundamental component from the coupling point voltage and to estimate the actual grid frequency. The Current control of the inverter has been performed by a multiresonant controller. The estimated grid frequency is fed to the neural adaptive filter and to the multiresonant controller. In this way, the inverter creates a Current equal in amplitude and opposite in sign to the load Harmonic Current, thus producing an almost sinusoidal grid Current. An automatic tuning of the multiresonant controller is implemented, which recognizes the largest three Harmonics of the load Current to be compensated by the APF. The stability analysis of the proposed control system is shown. The methodology has been applied in numerical simulations and experimentally to a properly devised test setup, also in comparison with the classic sinusoidal Current control based on the P-Q theory.
