The Experts below are selected from a list of 43728 Experts worldwide ranked by ideXlab platform
Ting Lu - One of the best experts on this subject based on the ideXlab platform.
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hybrid selective harmonic elimination pwm for common mode voltage reduction in three level neutral point clamped inverters for variable speed induction drives
IEEE Transactions on Power Electronics, 2012Co-Authors: Zhengming Zhao, Yulin Zhong, Liqiang Yuan, Hongwei Gao, Ting LuAbstract:This paper proposes a hybrid selective harmonic elimination pulsewidth Modulation (SHEPWM) scheme for common-mode voltage reduction in three-level neutral-point-clamped inverter-based induction motor drives. The scheme uses the conventional SHEPWM (C-SHEPWM) to control the inverter at high frequency (≥ 0.9 motor rated frequency) and uses the modified SHEPWM (M-SHEPWM) to control the inverter at low frequency. It also uses a scheme to ensure the smooth transition between the two SHEPWM schemes. As a result, at high frequency, the C-SHEPWM provides the required high Modulation Index for the motor, while at low frequency, when a passive filter is less effective for common-mode voltage reduction, the M-SHEPWM is used to suppress the common-mode voltage. Experimental results show that the proposed hybrid SHEPWM scheme could meet the Modulation Index need of the motor and reduce the common-mode voltage in the drive, and the two SHEPWM schemes could transition smoothly.
Ranjith Liyanapathirana - One of the best experts on this subject based on the ideXlab platform.
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on the exact formula for the minimum squared euclidean distance of cpfsk
IEEE Transactions on Communications, 1994Co-Authors: N Ekanayake, Ranjith LiyanapathiranaAbstract:In a paper by Rimoldi (see ibid., vol.39, no.9, p.1280, 1991) the closed-form expression for the minimum squared Euclidean distance of continuous-phase frequency-shift-keyed (CPFSK) signals with Modulation Index h/spl les/1/2 was derived. The authors extend the result derived by Rimoldi to include any rational Modulation Index. >
Frede Blaabjerg - One of the best experts on this subject based on the ideXlab platform.
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Modulation methods for three level neutral point clamped inverter achieving stress redistribution under moderate Modulation Index
IEEE Transactions on Power Electronics, 2016Co-Authors: Frede BlaabjergAbstract:This letter investigates the loss and thermal behaviors of a three-level neutral-point-clamped (3L-NPC) inverter undergoing moderate Modulation Index, which is typically presented during minor voltage sags of the power grid or speed changes of the electric machines. A series of new space vector Modulation methods is then proposed to relocate the thermal loading among the power devices. It is concluded that with some of the proposed Modulation methods, the device loading in the 3L-NPC inverter can be effectively modified and optimized, and the junction temperature of the most stressed devices can be also relieved. The control ability of dc bus midpoint potential, which is one of the crucial considerations for the 3L-NPC topology, is also investigated when applying the proposed Modulation methods.
Fang Zheng Peng - One of the best experts on this subject based on the ideXlab platform.
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hybrid pwm control for z source matrix converter
Energy Conversion Congress and Exposition, 2011Co-Authors: Qin Lei, Fang Zheng PengAbstract:This paper proposes four control strategies for Z-source matrix converter: simple maximum boost control, maximum boost control, maximum gain control and hybrid minimum stress control. The maximum gain control can obtain the maximum gain at the same Modulation Index among all four; and the hybrid minimum voltage stress control can obtain the minimum voltage stress at the same voltage gain. The relationship of voltage gain to Modulation Index and the relationship of voltage stress to voltage gain have been analyzed in detail for each method and verified by simulation and experiments.
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constant boost control of the z source inverter to minimize current ripple and voltage stress
IEEE Transactions on Industry Applications, 2006Co-Authors: Miaosen Shen, Fang Zheng Peng, Jin Wang, A Joseph, Leon M Tolbert, D J AdamsAbstract:This paper proposes two constant boost-control methods for the Z-source inverter, which can obtain maximum voltage gain at any given Modulation Index without producing any low-frequency ripple that is related to the output frequency and minimize the voltage stress at the same time. Thus, the Z-network requirement will be independent of the output frequency and determined only by the switching frequency. The relationship of voltage gain to Modulation Index is analyzed in detail and verified by simulation and experiments.
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maximum boost control of the z source inverter
IEEE Transactions on Power Electronics, 2005Co-Authors: Fang Zheng Peng, Miaosen Shen, Zhaoming QianAbstract:This paper explores control methods for the Z-source inverter and their relationships of voltage boost versus Modulation Index. A maximum boost control is presented to produce the maximum voltage boost (or voltage gain) under a given Modulation Index. The control method, relationships of voltage gain versus Modulation Index, and voltage stress versus voltage gain are analyzed in detail and verified by simulation and experiment.
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maximum constant boost control of the z source inverter
IEEE Industry Applications Society Annual Meeting, 2004Co-Authors: Miaosen Shen, Fang Zheng Peng, Jin Wang, A Joseph, Leon M Tolbert, D J AdamsAbstract:This paper proposes two maximum constant boost control methods for the Z-source inverter, which can obtain maximum voltage gain at any given Modulation Index without producing any low-frequency ripple that is related to the output frequency. Thus the Z-network requirement will be independent of the output frequency and determined only by the switching frequency. The relationship of voltage gain to Modulation Index is analyzed in detail and verified by simulation and experiment.
Zhengming Zhao - One of the best experts on this subject based on the ideXlab platform.
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hybrid selective harmonic elimination pwm for common mode voltage reduction in three level neutral point clamped inverters for variable speed induction drives
IEEE Transactions on Power Electronics, 2012Co-Authors: Zhengming Zhao, Yulin Zhong, Liqiang Yuan, Hongwei Gao, Ting LuAbstract:This paper proposes a hybrid selective harmonic elimination pulsewidth Modulation (SHEPWM) scheme for common-mode voltage reduction in three-level neutral-point-clamped inverter-based induction motor drives. The scheme uses the conventional SHEPWM (C-SHEPWM) to control the inverter at high frequency (≥ 0.9 motor rated frequency) and uses the modified SHEPWM (M-SHEPWM) to control the inverter at low frequency. It also uses a scheme to ensure the smooth transition between the two SHEPWM schemes. As a result, at high frequency, the C-SHEPWM provides the required high Modulation Index for the motor, while at low frequency, when a passive filter is less effective for common-mode voltage reduction, the M-SHEPWM is used to suppress the common-mode voltage. Experimental results show that the proposed hybrid SHEPWM scheme could meet the Modulation Index need of the motor and reduce the common-mode voltage in the drive, and the two SHEPWM schemes could transition smoothly.