The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
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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a dual five level inverter fed induction motor drive with common mode voltage elimination and dc Link Capacitor voltage balancing using only the switching state redundancy part ii
IEEE Transactions on Industrial Electronics, 2007Co-Authors: P N Tekwani, R S Kanchan, K GopakumarAbstract:The open-loop control scheme presented in part I of this paper for a dual five-level-inverter-fed induction motor (IM) drive with two dc power supplies maintains dc-Link Capacitorvoltage balancing and common-mode voltage (CMV) elimination throughout the operating range of the drive. The operating limitation of the proposed open-loop control scheme to take corrective action toward the existing unbalance in the dc-Link-Capacitor voltages is also pointed out in part I of this paper. As a solution to this, a simple closed-loop control scheme, which is based only on the switching-state redundancy, is proposed in this part of the paper. The proposed closed-loop control scheme not only prevents further unbalancing of Capacitor voltages but also takes corrective actions to bring back the Capacitor voltages in the balanced state. The proposed closed-loop scheme achieves dc-Link Capacitorvoltage balancing and elimination of CMV together in the complete modulation range, including overmodulation of up to the 24-step operation. The proposed control scheme does not affect the output fundamental voltage generated by the inverter, as it effectively utilizes only the availability of redundant switching states of the inverter, and does not call for additional power circuit hardware. The scheme is presented with the simulation studies and experimentally verified with a 1.5-kW open-end winding IM drive.
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three level inverter scheme with common mode voltage elimination and dc Link Capacitor voltage balancing for an open end winding induction motor drive
IEEE Transactions on Power Electronics, 2006Co-Authors: R S Kanchan, P N Tekwani, K GopakumarAbstract:A dc Link Capacitor voltage balancing scheme along with common mode voltage elimination is proposed for an induction motor drive, with open-end winding structure. The motor is fed from both the ends with three-level inverters generating a five level output voltage space phasor structure. If switching combinations, with zero common mode voltage in the pole voltage, are used, then the resultant voltage space vector combinations are equivalent to that of a three-level inverter. The proposed inverter vector locations exhibit greater multiplicity in the inverter switching combinations which is suitably exploited to arrive at a Capacitor voltage balancing scheme. This allows the use of a single dc Link power supply for the combined inverter structure. The simultaneous task of common mode voltage elimination with dc Link Capacitor voltage balancing, using only the switching state redundancies, is experimentally verified on a 1.5-kW induction motor drive
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five level inverter scheme for an induction motor drive with simultaneous elimination of common mode voltage and dc Link Capacitor voltage imbalance
IEE Proceedings - Electric Power Applications, 2005Co-Authors: P N Tekwani, R S Kanchan, K GopakumarAbstract:The simultaneous elimination of common-mode voltage and DC-Link Capacitor voltage imbalance is achieved in a five-level inverter scheme for an induction motor drive throughout its operating range. A dual five-level inverter-fed open-end-winding induction motor structure is used for the proposed drive. Initially, the operating limitations of achieving this dual task for the five-level inverter configuration are investigated for a single DC power supply. Subsequently, a switching strategy for a five-level inverter topology with two DC power supplies is proposed to achieve the dual task over the entire speed range of the drive. The proposed drive offers a simple power-bus structure with more redundant switching combinations for inverter voltage vectors, and requires a lower voltage-blocking capacity of the power devices as compared with the conventional single five-level inverter-fed drive. As only the availability of redundant switching combinations for inverter voltage vectors is exploited, the dual task is achieved without disturbing the fundamental component of the inverter output voltage and the scheme does not need any extra control circuit hardware. Experimental verification of the proposed scheme is done on a 1.5 kW induction motor drive in the linear as well as overmodulation range.
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five level inverter scheme for an induction motor drive with simultaneous elimination of common mode voltage and dc Link Capacitor voltage imbalance
IEE Proceedings - Electric Power Applications, 2005Co-Authors: P N Tekwani, R S Kanchan, K GopakumarAbstract:The simultaneous elimination of common-mode voltage and DC-Link Capacitor voltage imbalance is achieved in a five-level inverter scheme for an induction motor drive throughout its operating range. A dual five-level inverter-fed open-end-winding induction motor structure is used for the proposed drive. Initially, the operating limitations of achieving this dual task for the five-level inverter configuration are investigated for a single DC power supply. Subsequently, a switching strategy for a five-level inverter topology with two DC power supplies is proposed to achieve the dual task over the entire speed range of the drive. The proposed drive offers a simple power-bus structure with more redundant switching combinations for inverter voltage vectors, and requires a lower voltage-blocking capacity of the power devices as compared with the conventional single five-level inverter-fed drive. As only the availability of redundant switching combinations for inverter voltage vectors is exploited, the dual task is achieved without disturbing the fundamental component of the inverter output voltage and the scheme does not need any extra control circuit hardware. Experimental verification of the proposed scheme is done on a 1.5 kW induction motor drive in the linear as well as overmodulation range.
R S Kanchan - One of the best experts on this subject based on the ideXlab platform.
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a dual five level inverter fed induction motor drive with common mode voltage elimination and dc Link Capacitor voltage balancing using only the switching state redundancy part ii
IEEE Transactions on Industrial Electronics, 2007Co-Authors: P N Tekwani, R S Kanchan, K GopakumarAbstract:The open-loop control scheme presented in part I of this paper for a dual five-level-inverter-fed induction motor (IM) drive with two dc power supplies maintains dc-Link Capacitorvoltage balancing and common-mode voltage (CMV) elimination throughout the operating range of the drive. The operating limitation of the proposed open-loop control scheme to take corrective action toward the existing unbalance in the dc-Link-Capacitor voltages is also pointed out in part I of this paper. As a solution to this, a simple closed-loop control scheme, which is based only on the switching-state redundancy, is proposed in this part of the paper. The proposed closed-loop control scheme not only prevents further unbalancing of Capacitor voltages but also takes corrective actions to bring back the Capacitor voltages in the balanced state. The proposed closed-loop scheme achieves dc-Link Capacitorvoltage balancing and elimination of CMV together in the complete modulation range, including overmodulation of up to the 24-step operation. The proposed control scheme does not affect the output fundamental voltage generated by the inverter, as it effectively utilizes only the availability of redundant switching states of the inverter, and does not call for additional power circuit hardware. The scheme is presented with the simulation studies and experimentally verified with a 1.5-kW open-end winding IM drive.
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three level inverter scheme with common mode voltage elimination and dc Link Capacitor voltage balancing for an open end winding induction motor drive
IEEE Transactions on Power Electronics, 2006Co-Authors: R S Kanchan, P N Tekwani, K GopakumarAbstract:A dc Link Capacitor voltage balancing scheme along with common mode voltage elimination is proposed for an induction motor drive, with open-end winding structure. The motor is fed from both the ends with three-level inverters generating a five level output voltage space phasor structure. If switching combinations, with zero common mode voltage in the pole voltage, are used, then the resultant voltage space vector combinations are equivalent to that of a three-level inverter. The proposed inverter vector locations exhibit greater multiplicity in the inverter switching combinations which is suitably exploited to arrive at a Capacitor voltage balancing scheme. This allows the use of a single dc Link power supply for the combined inverter structure. The simultaneous task of common mode voltage elimination with dc Link Capacitor voltage balancing, using only the switching state redundancies, is experimentally verified on a 1.5-kW induction motor drive
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five level inverter scheme for an induction motor drive with simultaneous elimination of common mode voltage and dc Link Capacitor voltage imbalance
IEE Proceedings - Electric Power Applications, 2005Co-Authors: P N Tekwani, R S Kanchan, K GopakumarAbstract:The simultaneous elimination of common-mode voltage and DC-Link Capacitor voltage imbalance is achieved in a five-level inverter scheme for an induction motor drive throughout its operating range. A dual five-level inverter-fed open-end-winding induction motor structure is used for the proposed drive. Initially, the operating limitations of achieving this dual task for the five-level inverter configuration are investigated for a single DC power supply. Subsequently, a switching strategy for a five-level inverter topology with two DC power supplies is proposed to achieve the dual task over the entire speed range of the drive. The proposed drive offers a simple power-bus structure with more redundant switching combinations for inverter voltage vectors, and requires a lower voltage-blocking capacity of the power devices as compared with the conventional single five-level inverter-fed drive. As only the availability of redundant switching combinations for inverter voltage vectors is exploited, the dual task is achieved without disturbing the fundamental component of the inverter output voltage and the scheme does not need any extra control circuit hardware. Experimental verification of the proposed scheme is done on a 1.5 kW induction motor drive in the linear as well as overmodulation range.
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five level inverter scheme for an induction motor drive with simultaneous elimination of common mode voltage and dc Link Capacitor voltage imbalance
IEE Proceedings - Electric Power Applications, 2005Co-Authors: P N Tekwani, R S Kanchan, K GopakumarAbstract:The simultaneous elimination of common-mode voltage and DC-Link Capacitor voltage imbalance is achieved in a five-level inverter scheme for an induction motor drive throughout its operating range. A dual five-level inverter-fed open-end-winding induction motor structure is used for the proposed drive. Initially, the operating limitations of achieving this dual task for the five-level inverter configuration are investigated for a single DC power supply. Subsequently, a switching strategy for a five-level inverter topology with two DC power supplies is proposed to achieve the dual task over the entire speed range of the drive. The proposed drive offers a simple power-bus structure with more redundant switching combinations for inverter voltage vectors, and requires a lower voltage-blocking capacity of the power devices as compared with the conventional single five-level inverter-fed drive. As only the availability of redundant switching combinations for inverter voltage vectors is exploited, the dual task is achieved without disturbing the fundamental component of the inverter output voltage and the scheme does not need any extra control circuit hardware. Experimental verification of the proposed scheme is done on a 1.5 kW induction motor drive in the linear as well as overmodulation range.
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three level inverter scheme with common mode voltage elimination and dc Link Capacitor voltage balancing for an open end winding induction motor drive
International Electric Machines and Drives Conference, 2005Co-Authors: R S Kanchan, P N Tekwani, K GopakumarAbstract:A DC Link Capacitor voltage balancing scheme for an three-level inverter with open end winding induction motor drive is proposed in this paper. The multiplicity of the switching combinations of the inverter voltage locations is best exploited to arrive at the Capacitor balancing criterion. All the inverter vector locations, which has unbalancing effect on the Capacitor voltages, exhibits greater multiplicity than the conventional neutral point clamped three-level inverter. These switching combinations can be used properly to balance the Capacitor voltages. The effect of various switching combinations on the Capacitor voltages is established and then a closed loop hysteresis controller based Capacitor voltage balancing scheme is proposed. The performance of the proposed scheme for various operating conditions is demonstrated through simulation and experimental results. A 1.5 kW induction motor with open end windings is used for experimental verification of the proposed scheme
P N Tekwani - One of the best experts on this subject based on the ideXlab platform.
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a dual five level inverter fed induction motor drive with common mode voltage elimination and dc Link Capacitor voltage balancing using only the switching state redundancy part ii
IEEE Transactions on Industrial Electronics, 2007Co-Authors: P N Tekwani, R S Kanchan, K GopakumarAbstract:The open-loop control scheme presented in part I of this paper for a dual five-level-inverter-fed induction motor (IM) drive with two dc power supplies maintains dc-Link Capacitorvoltage balancing and common-mode voltage (CMV) elimination throughout the operating range of the drive. The operating limitation of the proposed open-loop control scheme to take corrective action toward the existing unbalance in the dc-Link-Capacitor voltages is also pointed out in part I of this paper. As a solution to this, a simple closed-loop control scheme, which is based only on the switching-state redundancy, is proposed in this part of the paper. The proposed closed-loop control scheme not only prevents further unbalancing of Capacitor voltages but also takes corrective actions to bring back the Capacitor voltages in the balanced state. The proposed closed-loop scheme achieves dc-Link Capacitorvoltage balancing and elimination of CMV together in the complete modulation range, including overmodulation of up to the 24-step operation. The proposed control scheme does not affect the output fundamental voltage generated by the inverter, as it effectively utilizes only the availability of redundant switching states of the inverter, and does not call for additional power circuit hardware. The scheme is presented with the simulation studies and experimentally verified with a 1.5-kW open-end winding IM drive.
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three level inverter scheme with common mode voltage elimination and dc Link Capacitor voltage balancing for an open end winding induction motor drive
IEEE Transactions on Power Electronics, 2006Co-Authors: R S Kanchan, P N Tekwani, K GopakumarAbstract:A dc Link Capacitor voltage balancing scheme along with common mode voltage elimination is proposed for an induction motor drive, with open-end winding structure. The motor is fed from both the ends with three-level inverters generating a five level output voltage space phasor structure. If switching combinations, with zero common mode voltage in the pole voltage, are used, then the resultant voltage space vector combinations are equivalent to that of a three-level inverter. The proposed inverter vector locations exhibit greater multiplicity in the inverter switching combinations which is suitably exploited to arrive at a Capacitor voltage balancing scheme. This allows the use of a single dc Link power supply for the combined inverter structure. The simultaneous task of common mode voltage elimination with dc Link Capacitor voltage balancing, using only the switching state redundancies, is experimentally verified on a 1.5-kW induction motor drive
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five level inverter scheme for an induction motor drive with simultaneous elimination of common mode voltage and dc Link Capacitor voltage imbalance
IEE Proceedings - Electric Power Applications, 2005Co-Authors: P N Tekwani, R S Kanchan, K GopakumarAbstract:The simultaneous elimination of common-mode voltage and DC-Link Capacitor voltage imbalance is achieved in a five-level inverter scheme for an induction motor drive throughout its operating range. A dual five-level inverter-fed open-end-winding induction motor structure is used for the proposed drive. Initially, the operating limitations of achieving this dual task for the five-level inverter configuration are investigated for a single DC power supply. Subsequently, a switching strategy for a five-level inverter topology with two DC power supplies is proposed to achieve the dual task over the entire speed range of the drive. The proposed drive offers a simple power-bus structure with more redundant switching combinations for inverter voltage vectors, and requires a lower voltage-blocking capacity of the power devices as compared with the conventional single five-level inverter-fed drive. As only the availability of redundant switching combinations for inverter voltage vectors is exploited, the dual task is achieved without disturbing the fundamental component of the inverter output voltage and the scheme does not need any extra control circuit hardware. Experimental verification of the proposed scheme is done on a 1.5 kW induction motor drive in the linear as well as overmodulation range.
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five level inverter scheme for an induction motor drive with simultaneous elimination of common mode voltage and dc Link Capacitor voltage imbalance
IEE Proceedings - Electric Power Applications, 2005Co-Authors: P N Tekwani, R S Kanchan, K GopakumarAbstract:The simultaneous elimination of common-mode voltage and DC-Link Capacitor voltage imbalance is achieved in a five-level inverter scheme for an induction motor drive throughout its operating range. A dual five-level inverter-fed open-end-winding induction motor structure is used for the proposed drive. Initially, the operating limitations of achieving this dual task for the five-level inverter configuration are investigated for a single DC power supply. Subsequently, a switching strategy for a five-level inverter topology with two DC power supplies is proposed to achieve the dual task over the entire speed range of the drive. The proposed drive offers a simple power-bus structure with more redundant switching combinations for inverter voltage vectors, and requires a lower voltage-blocking capacity of the power devices as compared with the conventional single five-level inverter-fed drive. As only the availability of redundant switching combinations for inverter voltage vectors is exploited, the dual task is achieved without disturbing the fundamental component of the inverter output voltage and the scheme does not need any extra control circuit hardware. Experimental verification of the proposed scheme is done on a 1.5 kW induction motor drive in the linear as well as overmodulation range.
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three level inverter scheme with common mode voltage elimination and dc Link Capacitor voltage balancing for an open end winding induction motor drive
International Electric Machines and Drives Conference, 2005Co-Authors: R S Kanchan, P N Tekwani, K GopakumarAbstract:A DC Link Capacitor voltage balancing scheme for an three-level inverter with open end winding induction motor drive is proposed in this paper. The multiplicity of the switching combinations of the inverter voltage locations is best exploited to arrive at the Capacitor balancing criterion. All the inverter vector locations, which has unbalancing effect on the Capacitor voltages, exhibits greater multiplicity than the conventional neutral point clamped three-level inverter. These switching combinations can be used properly to balance the Capacitor voltages. The effect of various switching combinations on the Capacitor voltages is established and then a closed loop hysteresis controller based Capacitor voltage balancing scheme is proposed. The performance of the proposed scheme for various operating conditions is demonstrated through simulation and experimental results. A 1.5 kW induction motor with open end windings is used for experimental verification of the proposed scheme
Jungik Ha - One of the best experts on this subject based on the ideXlab platform.
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single phase grid connected motor drive system with dc Link shunt compensator and small dc Link Capacitor
IEEE Transactions on Power Electronics, 2017Co-Authors: Hojoon Shin, Young-ho Chae, Jungik HaAbstract:The single-phase diode rectifier system with small dc-Link Capacitor shows wide diode conduction time and it improves the grid current harmonics. By shaping the output power, the system meets the grid current harmonics regulation without any power factor corrector or grid filter inductor. However, the system has torque ripple and suffers efficiency degradation due to the insufficient dc-Link voltage. To solve this problem, this paper proposes the dc-Link shunt compensator (DSC) for small dc-Link Capacitor systems. DSC is located on dc-node in parallel and operates as voltage source, improving the system performances. This circuit helps the grid current-shaping control during grid-connection time, and reduces the flux-weakening current by supplying the energy to the motor during grid-disconnection time. This paper presents a power control method and the design guideline of DSC. The feasibility of DSC is verified by simulation and experimental results.
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discontinuous grid current control of motor drive system with single phase diode rectifier and small dc Link Capacitor
IEEE Transactions on Power Electronics, 2017Co-Authors: Jungik HaAbstract:In this paper, a control method for motor drive system without electrolytic Capacitor is proposed. Since dc-Link Capacitor of this motor drive is about 1% of the conventional one, it can satisfy the grid current regulation of IEC61000-3-2 without bulky filter circuits by directly controlling the electric output power of the inverter. However, dc-Link voltage of this drive fluctuates as the rectified grid voltage. It causes higher motor current, especially at the low dc-Link voltage area, and severely harms the drive efficiency. To solve this problem, proposed method keeps the dc-Link voltage higher than certain limit while controlling the output power. It can improve the efficiency of the drive by lowering the d-axis current at low dc-Link voltage area, with satisfying the regulation with small grid current harmonics. The proposed method includes the motor current reference generation for the limited dc-Link voltage and selection of the limitation value. The improved performance of the proposed method was verified by the experimental results.
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direct power control of a three phase inverter for grid input current shaping of a single phase diode rectifier with a small dc Link Capacitor
IEEE Transactions on Power Electronics, 2015Co-Authors: Yeongrack Son, Jungik HaAbstract:This paper describes motor drive system fed by a single-phase diode rectifier without power factor correction (PFC) circuit or the input filter. The system considered in this paper consists of a single-phase diode rectifier, a three-phase inverter, and a small dc-Link Capacitor. Since dc-Link capacitance of the proposed system is few microfarads, the shape of the grid input current is directly affected by electrical output power of the inverter. Using this aspect, two goals of the drive system, controlling torque of the motor and suppressing the grid input current harmonics, can be simultaneously achieved by controlling the output power of the inverter. The proposed method includes the motor current reference generation and the direct output power regulation by modifying the output voltage reference. With the proposed method, the harmonic components of the grid input current can be reduced under the limits of the regulation IEC61000-3-2, lower than those in the conventional method. Also, the cost and size of the inverter system can be significantly reduced by removing electrolytic dc-Link Capacitor and input filter from the system. The performance of the proposed shaping method was validated by the experimental results using the motor drive system with a 5μF film Capacitor at dc Link.
Hui Li - One of the best experts on this subject based on the ideXlab platform.
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high frequency Link based grid tied pv system with small dc Link Capacitor and low frequency ripple free maximum power point tracking
IEEE Transactions on Power Electronics, 2016Co-Authors: Rui Li, Hui LiAbstract:This paper proposes a grid-tied photovoltaic (PV) system consisting of modular current-fed dual-active-bridge (CF-DAB) dc–dc converter with cascaded multilevel inverter. The proposed converter allows a small dc-Link Capacitor in the three-phase wye-connected PV system; therefore, the system reliability can be improved by replacing electrolytic Capacitors with film Capacitors. The low-frequency ripple-free maximum power point tracking (MPPT) is also realized in the proposed converter. First of all, to minimize the influence resulting from reduced capacitance, a dc-Link voltage synchronizing control is developed. Then, a detailed design of power mitigation control based on CF-DAB dynamic model is presented to prevent the large low-frequency voltage variation propagating from the dc-Link to PV side. Finally, a novel variable step-size MPPT algorithm is proposed to ensure not only high MPPT efficiency, but also fast maximum power extraction under rapid irradiation change. A downscaled 5-kW PV converter module with a small dc-Link Capacitor was built in the laboratory with the proposed control and MPPT algorithm, and experimental results are given to validate the converter performance.