The Experts below are selected from a list of 91281 Experts worldwide ranked by ideXlab platform
M. R. Baiju - One of the best experts on this subject based on the ideXlab platform.
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fractal based space vector pwm for multilevel Inverters a novel approach
IEEE Transactions on Industrial Electronics, 2009Co-Authors: A Gopinath, A S A Mohamed, M. R. BaijuAbstract:A space vector pulsewidth-modulation (SVPWM) technique based on fractal approach for multilevel Inverters is presented. This paper proposes a view that the space vector locations of multilevel Inverters possess a fractal structure, and the properties of fractal structure together with the simplicity of fractal arithmetic are exploited to generate the SVPWM. The proposed method does not use any lookup tables for sector identification. The switching space vectors are also directly determined without using any lookup tables. The proposed scheme can be extended to an n-level Inverter, and a generalized algorithm is also presented. The proposed scheme for generating SVPWM for multilevel Inverters is explained for a five-level Inverter, and experimental results are presented for a three-level Inverter.
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Five-level Inverter voltage-space phasor generation for an open-end winding induction motor drive
IEE Proceedings - Electric Power Applications, 2003Co-Authors: M. R. Baiju, V T Somasekhar, K Gopakumar, K.k. Mohapatra, Loganathan UmanandAbstract:A topology for voltage-space phasor generation equivalent to a five-level Inverter for an open-end winding induction motor is presented. The open-end winding induction motor is fed from both ends by two three-level Inverters. The three-level Inverters are realised by cascading two two-level Inverters. This Inverter scheme does not experience neutral-point fluctuations. Of the two three-level Inverters only one will be switching at any instant in the lower speed ranges. In the multilevel carrier-based SPWM used for the proposed drive, a progressive discrete DC bias depending on the speed range is given to the reference wave to reduce the Inverter switchings. The drive is implemented and tested with a 1 HP open-end winding induction motor and experimental results are presented.
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A five-level Inverter voltage space phasor generation for an open-end winding induction motor drive
Eighteenth Annual IEEE Applied Power Electronics Conference and Exposition 2003. APEC '03., 2024Co-Authors: M. R. Baiju, V T Somasekhar, K Gopakumar, K.k. Mohapatra, Loganathan UmanandAbstract:A topology for voltage space phasor generation equivalent to a 5-level Inverter for an open-end winding induction motor is presented. The open-end winding induction motor is fed from both ends by two 3-level Inverters. The three level Inverters are realised by cascading two 2-level Inverters. This Inverter scheme does not experience neutral point fluctuations. Of the two 3-level Inverters only one Inverter will be switching at any instant in the lower speed ranges. In the multi level carrier based SPWM used for the proposed drive, a progressive discrete DC bias depending upon the speed range is given to the reference wave to reduce the Inverter switchings. The drive is implemented and tested with a 1Hp open-end winding induction motor and the experimental results are presented.
V T Somasekhar - One of the best experts on this subject based on the ideXlab platform.
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a dual Inverter fed four level open end winding induction motor drive with a nested rectifier Inverter
IEEE Transactions on Industrial Informatics, 2013Co-Authors: B.v. Reddy, V T SomasekharAbstract:A four-level Inverter drive could be obtained by feeding an open-end winding induction motor by two two-level Inverters from either side with unequal dc-link voltages, which are in the ratio of 2:1. This Inverter modulation scheme is capable of producing 64 space-vector combinations. Some of the space vector combinations could result in the overcharging of the dc-link capacitor corresponding to the Inverter operating with the lower voltage. In this paper, a new power circuit topology is proposed, in which, a rectifier-Inverter combination is nested within a conventional two-level Inverter configuration. The output of the conventional two-level Inverter feeds one end of the open-end winding induction motor, while the output of the nested rectifier-Inverter combination feeds the other end. The total dc-link voltage needed in the proposed topology is only 77% of the one needed in the conventional multilevel Inverters. Also, the problem of zero-sequence current, commonly encountered in open-end winding induction motor drives, is avoided by resorting to a decoupled space vector modulation PWM scheme, which eliminates the zero-sequence voltage of the dual-Inverter system by forcing the sampled average of the zero sequence voltage of individual Inverters to zero.
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Five-level Inverter voltage-space phasor generation for an open-end winding induction motor drive
IEE Proceedings - Electric Power Applications, 2003Co-Authors: M. R. Baiju, V T Somasekhar, K Gopakumar, K.k. Mohapatra, Loganathan UmanandAbstract:A topology for voltage-space phasor generation equivalent to a five-level Inverter for an open-end winding induction motor is presented. The open-end winding induction motor is fed from both ends by two three-level Inverters. The three-level Inverters are realised by cascading two two-level Inverters. This Inverter scheme does not experience neutral-point fluctuations. Of the two three-level Inverters only one will be switching at any instant in the lower speed ranges. In the multilevel carrier-based SPWM used for the proposed drive, a progressive discrete DC bias depending on the speed range is given to the reference wave to reduce the Inverter switchings. The drive is implemented and tested with a 1 HP open-end winding induction motor and experimental results are presented.
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A five-level Inverter voltage space phasor generation for an open-end winding induction motor drive
Eighteenth Annual IEEE Applied Power Electronics Conference and Exposition 2003. APEC '03., 2024Co-Authors: M. R. Baiju, V T Somasekhar, K Gopakumar, K.k. Mohapatra, Loganathan UmanandAbstract:A topology for voltage space phasor generation equivalent to a 5-level Inverter for an open-end winding induction motor is presented. The open-end winding induction motor is fed from both ends by two 3-level Inverters. The three level Inverters are realised by cascading two 2-level Inverters. This Inverter scheme does not experience neutral point fluctuations. Of the two 3-level Inverters only one Inverter will be switching at any instant in the lower speed ranges. In the multi level carrier based SPWM used for the proposed drive, a progressive discrete DC bias depending upon the speed range is given to the reference wave to reduce the Inverter switchings. The drive is implemented and tested with a 1Hp open-end winding induction motor and the experimental results are presented.
Loganathan Umanand - One of the best experts on this subject based on the ideXlab platform.
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Five-level Inverter voltage-space phasor generation for an open-end winding induction motor drive
IEE Proceedings - Electric Power Applications, 2003Co-Authors: M. R. Baiju, V T Somasekhar, K Gopakumar, K.k. Mohapatra, Loganathan UmanandAbstract:A topology for voltage-space phasor generation equivalent to a five-level Inverter for an open-end winding induction motor is presented. The open-end winding induction motor is fed from both ends by two three-level Inverters. The three-level Inverters are realised by cascading two two-level Inverters. This Inverter scheme does not experience neutral-point fluctuations. Of the two three-level Inverters only one will be switching at any instant in the lower speed ranges. In the multilevel carrier-based SPWM used for the proposed drive, a progressive discrete DC bias depending on the speed range is given to the reference wave to reduce the Inverter switchings. The drive is implemented and tested with a 1 HP open-end winding induction motor and experimental results are presented.
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A five-level Inverter voltage space phasor generation for an open-end winding induction motor drive
Eighteenth Annual IEEE Applied Power Electronics Conference and Exposition 2003. APEC '03., 2024Co-Authors: M. R. Baiju, V T Somasekhar, K Gopakumar, K.k. Mohapatra, Loganathan UmanandAbstract:A topology for voltage space phasor generation equivalent to a 5-level Inverter for an open-end winding induction motor is presented. The open-end winding induction motor is fed from both ends by two 3-level Inverters. The three level Inverters are realised by cascading two 2-level Inverters. This Inverter scheme does not experience neutral point fluctuations. Of the two 3-level Inverters only one Inverter will be switching at any instant in the lower speed ranges. In the multi level carrier based SPWM used for the proposed drive, a progressive discrete DC bias depending upon the speed range is given to the reference wave to reduce the Inverter switchings. The drive is implemented and tested with a 1Hp open-end winding induction motor and the experimental results are presented.
S. Srinivas - One of the best experts on this subject based on the ideXlab platform.
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discontinuous decoupled pwms for reduced current ripple in a dual two level Inverter fed open end winding induction motor drive
IEEE Transactions on Power Electronics, 2013Co-Authors: K R Sekhar, S. SrinivasAbstract:This paper presents investigations on current ripple in a dual 2-level Inverter feeding an open-end winding induction motor drive. Pulsewidth modulations (PWMs) for the independently controlled Inverters are implemented using a simple effective time placement affected by offset-time concept, thus, eliminating the use of sector identification and lookup tables. Analytical expressions for ripple content in the motor phase current are developed and a current trajectory is theoretically obtained directly from the switching states of the dual Inverter in a stationary reference frame. In addition, this paper also describes a current ripple trajectory in the motor by exploring the freedom of independently operating the individual Inverters with different PWMs. Based on the analysis, discontinuous PWMs are employed for the individually Inverters that not only offer the advantage of reducing the total switching commutations in the Inverters but also reduces the current ripple. Analytical expression for the RMS ripple current and variation in RMS ripple current in one cycle of operation for different PWMs are also presented for the entire speed range of the dual-Inverter drive. The performance of the dual-Inverter drive with the proposed PWM variants is first studied analytically and then verified by performing suitable experiments on a 1-kW open-end winding induction motor drive.
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an improved pwm for a dual two level Inverter fed open end winding induction motor drive
International Conference on Electrical Machines, 2010Co-Authors: K Ramachandrasekhar, Shravan Mohan, S. SrinivasAbstract:Three-level voltage space vector can be synthesized using a dual two-level Inverter scheme employing open-end winding induction motor drive. Owing to the advantages this configuration offers over the other popular three-level Inverter configurations, many PWM control strategies have been proposed. Towards this end, alternate sub-hexagonal center PWM switching scheme was presented recently that employs each of the two-level Inverters as clamping and switching Inverters. In this paper, an improved PWM switching scheme is proposed that is aimed at further reducing the number of switching commutations in the dual-Inverter. It is attempted to reduce the switching commutations in the dual-Inverter especially during the changeover of Inverters roles from clamping to switching Inverter and vice versa in the entire cycle of the supply. A significant 50% reduction in the number of switching commutations in the dual-Inverter is achieved with the use of the proposed PWM scheme. The implementation of the PWM scheme neither requires any look-up tables nor sector identification while it only requires the magnitudes of instantaneous three phase reference voltages. The improved PWM scheme is first simulated and verified experimentally by driving the dual-Inverter fed open-end winding induction motor by employing V/f control.
K Gopakumar - One of the best experts on this subject based on the ideXlab platform.
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a dual seven level Inverter supply for an open end winding induction motor drive
IEEE Transactions on Industrial Electronics, 2009Co-Authors: Gopal Mondal, K Gopakumar, K Sivakumar, Rijil Ramchand, E LeviAbstract:This paper develops a seven-level Inverter structure for open-end winding induction motor drives. The Inverter supply is realized by cascading four two-level and two three-level neutral-point-clamped Inverters. The Inverter control is designed in such a way that the common-mode voltage (CMV) is eliminated. DC-link capacitor voltage balancing is also achieved by using only the switching-state redundancies. The proposed power circuit structure is modular and therefore suitable for fault-tolerant applications. By appropriately isolating some of the Inverters, the drive can be operated during fault conditions in a five-level or a three-level Inverter mode, with preserved CMV elimination and DC-link capacitor voltage balancing, within a reduced modulation range.
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Five-level Inverter voltage-space phasor generation for an open-end winding induction motor drive
IEE Proceedings - Electric Power Applications, 2003Co-Authors: M. R. Baiju, V T Somasekhar, K Gopakumar, K.k. Mohapatra, Loganathan UmanandAbstract:A topology for voltage-space phasor generation equivalent to a five-level Inverter for an open-end winding induction motor is presented. The open-end winding induction motor is fed from both ends by two three-level Inverters. The three-level Inverters are realised by cascading two two-level Inverters. This Inverter scheme does not experience neutral-point fluctuations. Of the two three-level Inverters only one will be switching at any instant in the lower speed ranges. In the multilevel carrier-based SPWM used for the proposed drive, a progressive discrete DC bias depending on the speed range is given to the reference wave to reduce the Inverter switchings. The drive is implemented and tested with a 1 HP open-end winding induction motor and experimental results are presented.
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A five-level Inverter voltage space phasor generation for an open-end winding induction motor drive
Eighteenth Annual IEEE Applied Power Electronics Conference and Exposition 2003. APEC '03., 2024Co-Authors: M. R. Baiju, V T Somasekhar, K Gopakumar, K.k. Mohapatra, Loganathan UmanandAbstract:A topology for voltage space phasor generation equivalent to a 5-level Inverter for an open-end winding induction motor is presented. The open-end winding induction motor is fed from both ends by two 3-level Inverters. The three level Inverters are realised by cascading two 2-level Inverters. This Inverter scheme does not experience neutral point fluctuations. Of the two 3-level Inverters only one Inverter will be switching at any instant in the lower speed ranges. In the multi level carrier based SPWM used for the proposed drive, a progressive discrete DC bias depending upon the speed range is given to the reference wave to reduce the Inverter switchings. The drive is implemented and tested with a 1Hp open-end winding induction motor and the experimental results are presented.
