The Experts below are selected from a list of 163377 Experts worldwide ranked by ideXlab platform
Heng Nian - One of the best experts on this subject based on the ideXlab platform.
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torque ripple suppression method with reduced switching frequency for open winding pmsm drives with common dc bus
IEEE Transactions on Industrial Electronics, 2019Co-Authors: Wei Hu, Heng Nian, Taiying ZhengAbstract:Torque ripple caused by Zero-Sequence current (ZSC) and relatively high switching frequency severely worsens the operating performance of an open-winding permanent-magnet synchronous machine (OW-PMSM) system with common dc bus. In this paper, a novel q -axis current injection method based on the angle-shift-based voltage distribution is proposed for the OW-PMSM system with common dc bus. With the proposed method, torque ripple caused by ZSC can be counteracted by the torque Component generated by the injected q -axis current. Meanwhile, the corresponding modulation range is analyzed to investigate the availability of the proposed method. Moreover, in order to reduce the switching frequency, zero vector (111) is no longer necessary to compensate the Zero-Sequence Component and conventional space vector pulsewidth modulation (PWM) with zero vectors (000) and (111) can be simplified. The switching actions in one PWM period can be reduced from 12 to 8. The comparison of losses shows that this strategy can effectively improve the efficiency under both heavy load and high switching frequencies. Finally, the effectiveness of the proposed method is validated through an OW-PMSM experiment with common dc bus.
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zero sequence current suppression strategy of open winding pmsg system with common dc bus based on zero vector redistribution
IEEE Transactions on Industrial Electronics, 2015Co-Authors: Yijie Zhou, Heng NianAbstract:The open-winding configuration with a common dc bus provides a Zero-Sequence current loop which allows the Zero-Sequence current flowing. With the application in permanent magnet synchronous generator (PMSG) systems, the existing Zero-Sequence current is inevitably caused by the common mode voltage generated by pulsewidth modulation (PWM) techniques and the third back EMF by the inherent flux harmonic Component. With the mathematical modeling analysis, the Zero-Sequence equivalent circuit based on the PMSG system is proposed. Meanwhile, a Zero-Sequence current suppression controller is designed. In this paper, a zero vector redistribution PWM technique is proposed. With this technique, the dwell times of zero vectors (000) and (111) for both converters are determined. Meanwhile, it gives the Zero-Sequence Component overmodulation analysis. Both the control method and improved PWM technique are implemented in a 1-kW open-winding PMSG experimental setup, and the experimental results are discussed.
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zero sequence current suppression strategy of open winding pmsg system with common dc bus based on zero vector redistribution
IEEE Transactions on Industrial Electronics, 2015Co-Authors: Yijie Zhou, Heng NianAbstract:The open-winding configuration with a common dc bus provides a Zero-Sequence current loop which allows the Zero-Sequence current flowing. With the application in permanent magnet synchronous generator (PMSG) systems, the existing Zero-Sequence current is inevitably caused by the common mode voltage generated by pulsewidth modulation (PWM) techniques and the third back EMF by the inherent flux harmonic Component. With the mathematical modeling analysis, the Zero-Sequence equivalent circuit based on the PMSG system is proposed. Meanwhile, a Zero-Sequence current suppression controller is designed. In this paper, a zero vector redistribution PWM technique is proposed. With this technique, the dwell times of zero vectors (000) and (111) for both converters are determined. Meanwhile, it gives the Zero-Sequence Component overmodulation analysis. Both the control method and improved PWM technique are implemented in a 1-kW open-winding PMSG experimental setup, and the experimental results are discussed.
Yijie Zhou - One of the best experts on this subject based on the ideXlab platform.
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zero sequence current suppression strategy of open winding pmsg system with common dc bus based on zero vector redistribution
IEEE Transactions on Industrial Electronics, 2015Co-Authors: Yijie Zhou, Heng NianAbstract:The open-winding configuration with a common dc bus provides a Zero-Sequence current loop which allows the Zero-Sequence current flowing. With the application in permanent magnet synchronous generator (PMSG) systems, the existing Zero-Sequence current is inevitably caused by the common mode voltage generated by pulsewidth modulation (PWM) techniques and the third back EMF by the inherent flux harmonic Component. With the mathematical modeling analysis, the Zero-Sequence equivalent circuit based on the PMSG system is proposed. Meanwhile, a Zero-Sequence current suppression controller is designed. In this paper, a zero vector redistribution PWM technique is proposed. With this technique, the dwell times of zero vectors (000) and (111) for both converters are determined. Meanwhile, it gives the Zero-Sequence Component overmodulation analysis. Both the control method and improved PWM technique are implemented in a 1-kW open-winding PMSG experimental setup, and the experimental results are discussed.
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zero sequence current suppression strategy of open winding pmsg system with common dc bus based on zero vector redistribution
IEEE Transactions on Industrial Electronics, 2015Co-Authors: Yijie Zhou, Heng NianAbstract:The open-winding configuration with a common dc bus provides a Zero-Sequence current loop which allows the Zero-Sequence current flowing. With the application in permanent magnet synchronous generator (PMSG) systems, the existing Zero-Sequence current is inevitably caused by the common mode voltage generated by pulsewidth modulation (PWM) techniques and the third back EMF by the inherent flux harmonic Component. With the mathematical modeling analysis, the Zero-Sequence equivalent circuit based on the PMSG system is proposed. Meanwhile, a Zero-Sequence current suppression controller is designed. In this paper, a zero vector redistribution PWM technique is proposed. With this technique, the dwell times of zero vectors (000) and (111) for both converters are determined. Meanwhile, it gives the Zero-Sequence Component overmodulation analysis. Both the control method and improved PWM technique are implemented in a 1-kW open-winding PMSG experimental setup, and the experimental results are discussed.
Danwei Wang - One of the best experts on this subject based on the ideXlab platform.
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relationship between space vector modulation and three phase carrier based pwm a comprehensive analysis three phase inverters
IEEE Transactions on Industrial Electronics, 2002Co-Authors: Keliang Zhou, Danwei WangAbstract:This paper comprehensively analyzes the relationship between space-vector modulation and three-phase carrier-based pulse width modulation (PWM). The relationships involved, such as the relationship between modulation signals (including Zero-Sequence Component and fundamental Components) and space vectors, the relationship between the modulation signals and the space-vector sectors, the relationship between the switching pattern of space-vector modulation and the type of carrier, and the relationship between the distribution of zero vectors and different Zero-Sequence signal are systematically established. All the relationships provide a bidirectional bridge for the transformation between carrier-based PWM modulators and space-vector modulation modulators. It is shown that all the drawn conclusions are independent of the load type. Furthermore, the implementations of both space-vector modulation and carrier-based PWM in a closed-loop feedback converter are discussed.
M. Molinas - One of the best experts on this subject based on the ideXlab platform.
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An Energy-based Controller for HVDC Modular Multilevel Converter in Decoupled Double Synchronous Reference Frame for Voltage Oscillations Reduction
IEEE Transactions on Industrial Electronics, 2013Co-Authors: Gilbert Bergna Diaz, Jean-claude Vannier, Pierre Lefranc, Amir Arzandé, E. Berne, P. Egrot, M. MolinasAbstract:This work consists of the presentation of a regulation strategy capable of controlling the energy stored in the Modular Multilevel Converter (MMC) in a HVDC configuration. This is achieved by regulating the positive, negative and zero sequences in dqo coordinates of the differential current using two rotating reference frames: at once and at twice the fundamental grid frequency value. Active and reactive negative sequence Components of the differential current at twice the fundamental frequency are used to eliminate the oscillations of the threephased leg-energy reducing significantly the capacitor voltage oscillations, while the zero sequence Component is used to regulate the total energy stored at a given reference. Meanwhile, active and reactive positive sequence Components of the circulating current are used for eliminating the average energy difference between the upper and lower arms in a three-phase MMC. In order to decouple efficiently the differential current Components the Double Synchronous Reference Frame (DDSRF) current control strategy is used. Finally, simulation results validate the performance of the MMC in a HVDC configuration with the proposed control. Control equations are demonstrated, and cross-coupled leg-energy terms are introduced.
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an energy based controller for hvdc modular multilevel converter in decoupled double synchronous reference frame for voltage oscillation reduction
IEEE Transactions on Industrial Electronics, 2013Co-Authors: Gilbert Bergna, Pierre Lefranc, Amir Arzandé, E. Berne, P. Egrot, Jc Vannier, M. MolinasAbstract:This paper consists of the presentation of a regulation strategy capable of controlling the energy stored in the modular multilevel converter (MMC) in an HVDC configuration. This is achieved by regulating the positive, negative, and zero sequences in dqo coordinates of the differential current using two rotating reference frames: at once and at twice the fundamental grid frequency value. The active and reactive negative sequence Components of the differential current at twice the fundamental frequency are used to eliminate the oscillations of the three-phased leg energy, reducing significantly the capacitor voltage oscillations, while the Zero-Sequence Component is used to regulate the total energy stored at a given reference. Meanwhile, active and reactive positive sequence Components of the circulating current are used for eliminating the average energy difference between the upper and lower arms in a three-phase MMC. In order to decouple efficiently the differential current Components, the decoupled-double-synchronous-reference-frame current control strategy is used. Finally, simulation results validate the performance of the MMC in an HVDC configuration with the proposed control. Control equations are demonstrated, and cross-coupled leg-energy terms are introduced.
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Modular Multilevel Converter leg-energy controller in rotating reference frame for voltage oscillations reduction
2012Co-Authors: Gilbert Bergna Diaz, Jean-claude Vannier, Pierre Lefranc, Amir Arzandé, E. Berne, P. Egrot, M. MolinasAbstract:This work consists of the presentation of a regulation strategy capable of controlling the energy stored in the DC capacitors of the upper and lower arms of a Modular Multilevel Converter (MMC) for each phase. This is achieved by regulating the positive, negative and zero sequences in dqo coordinates of the differential current using a rotating reference frame at twice the fundamental value. Active and reactive Components of the differential current are used to eliminate the oscillations of the three-phased leg-energy which reduces significantly the capacitor voltage oscillations, while the zero sequence Component is used to regulate the whole system energy at a given value. All feed-forwards equations are demonstrated, and cross-coupled leg-energy terms are introduced.
Yenshin Lai - One of the best experts on this subject based on the ideXlab platform.
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the relationship between space vector modulation and regular sampled pwm
IEEE Transactions on Industrial Electronics, 1997Co-Authors: S R Bowes, Yenshin LaiAbstract:The relationship between regular-sampled pulse-width modulation (PWM) and space-vector modulation for inverter drives is defined, and it is shown that, under certain circumstances, the two approaches are equivalent. The various possibilities of adding a Zero-Sequence Component to the regular-sampled sinusoidal modulating wave are explored, and these effects are quantified. It is shown that this leads to "equal-null" pulse times, which extend the linear modulation range and simplify the microprocessor implementation.
