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K Gopakumar - One of the best experts on this subject based on the ideXlab platform.

  • a three level Common Mode Voltage eliminated inverter with single dc supply using flying capacitor inverter and cascaded h bridge
    IEEE Transactions on Power Electronics, 2014
    Co-Authors: Roshan P Kumar, K Gopakumar, P P Rajeevan, K Mathew, Jose I Leon, L G Franquelo
    Abstract:

    A three-level Common-Mode Voltage eliminated inverter with single dc supply using flying capacitor inverter and cascaded H-bridge has been proposed in this paper. The three phase space vector polygon formed by this configuration and the polygon formed by the Common-Mode eliminated states have been discussed. The entire system is simulated in Simulink and the results are experimentally verified. This system has an advantage that if one of devices in the H-bridge fails, the system can still be operated as a normal three-level inverter at full power. This inverter has many other advantages like use of single dc supply, making it possible for a back-to-back grid-tied converter application, improved reliability, etc.

  • Common Mode Voltage elimination scheme for dual inverter fed five phase ac drives with open end stator windings
    International Conference on Industrial Technology, 2013
    Co-Authors: P P Rajeevan, Haitham Aburub, Atif Iqbal, K Gopakumar
    Abstract:

    This paper proposes a PWM scheme for Common-Mode Voltage elimination of a five-phase inverter fed AC drive with open-end stator windings. Alternating Common Mode Voltages are eliminated from the inverter poles as well as phase Voltages thereby mitigating all the problems due to Common Mode Voltages usually encountered in PWM inverter-fed drives, considered to be one of the main reasons for mechanical failures of the motor. In addition, the elimination of Common Mode Voltages facilitates the use of single DC source for feeding both ends of the windings through two five-phase, two-level inverters. A carrier based technique without involving any dwell time calculations or sector identification is proposed for implementation of the PWM scheme. The proposed PWM scheme is validated by extensive simulation on a Matlab/Simulink platform and then verified experimentally on a laboratory prototype.

  • twelve sided polygonal Voltage space vector based multilevel inverter for an induction motor drive with Common Mode Voltage elimination
    IEEE Transactions on Industrial Electronics, 2007
    Co-Authors: Sanjay Lakshminarayanan, Gopal Mondal, P N Tekwani, K K Mohapatra, K Gopakumar
    Abstract:

    In this paper, a 12-sided polygonal Voltage space vector generation with Common-Mode Voltage elimination (CME) is proposed for an induction motor drive. An open-end winding configuration is used for the motor. The proposed multilevel structure is achieved by cascading only the conventional two-level inverters with asymmetrical dc link Voltages. By appropriately selecting the Voltage vectors with identical Common-Mode Voltage from the opposite ends, a pulsewidth modulation (PWM) strategy with zero Common-Mode Voltage variation can be achieved for the entire modulation range with a Common dc link requirement for both the inverter systems. Along with the CME, the proposed 12-sided polygonal space vector based multilevel inverter structure has increased modulation range with the absence of 5th, 7th, 17th, 19th, etc., harmonics up to 12-step operation. The bandwidth problems associated with conventional hexagonal Voltage space vector structure current controllers due to the presence of 5th and 7th harmonics in the overmodulation region are absent in the present 12-sided structure. So a simple PWM Voltage control with linear Voltage control up to 12-step operation is possible from the present 12-sided scheme with less current control complexity.

  • a reduced switch count five level inverter with Common Mode Voltage elimination for an open end winding induction motor drive
    IEEE Transactions on Industrial Electronics, 2007
    Co-Authors: Gopal Mondal, P N Tekwani, K Gopakumar, E Levi
    Abstract:

    The paper presents a five-level inverter scheme with reduced power circuit complexity for an induction motor drive. The scheme is realized by cascading conventional two-level and three-level neutral point clamped inverters in conjunction with an open-end winding three-phase induction motor drive. An inverter control scheme with Common-Mode Voltage (CMV) elimination, along with a simple DC link Voltage control, is developed by using only switching states with zero CMV for the entire modulation range. Theoretical considerations are experimentally verified for a variety of operating conditions.

  • 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, 2006
    Co-Authors: R S Kanchan, P N Tekwani, K Gopakumar
    Abstract:

    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

Wenping Cao - One of the best experts on this subject based on the ideXlab platform.

  • controller strategy for open winding brushless doubly fed wind power generator with Common Mode Voltage elimination
    IEEE Transactions on Industrial Electronics, 2019
    Co-Authors: Fengge Zhang, Liancheng Zhu, Shi Jin, Sul Ademi, Wenping Cao
    Abstract:

    This paper presents the theoretical derivation and implementation of a novel direct power control for open-winding brushless doubly fed reluctance generator (OW-BDFRG). As one of the promising brushless candidates, the OW-BDFRG is characterized with two stator windings fed by a dual controllable two-level three-phase converters through a Common dc bus with Common Mode Voltage elimination. The parameter-free control strategy is designed to obtain maximum power point tracking with variable speed constant frequency (VSCF) for wind energy conversion systems (WECSs). Compared to the traditional three-level converter systems, the dc bus Voltage, ac-side Voltage and capacity ratings of the proposed converter system are notably high while the reliability, redundancy, and fault tolerance are significantly improved. Effectiveness, correctness, and robustness of the proposed control strategy and the Common Mode Voltage elimination scheme are evaluated and confirmed through simulation and experimental tests on a 42-kW generator prototype typical for VSCF-WECS.

  • direct power control with Common Mode Voltage elimination for open winding brushless doubly fed wind power generators
    IEEE Transportation Electrification Conference and Expo Asia-Pacific, 2016
    Co-Authors: Liancheng Zhu, Fengge Zhang, Shi Jin, Sul Ademi, Zuoxia Xing, Wenping Cao
    Abstract:

    In this paper, a new open-winding control strategy is proposed for a brushless doubly-fed reluctance generator (BDFRG) applicable for wind turbines. The BDFRG control winding is fed via a dual two-level three-phase converter using a single dc bus. Direct power control based on maximum power point tracking with Common Mode Voltage elimination is designed, which not only the active and reactive power is decoupled, but the reliability and redundancy are all improved greatly by increasing the switching Modes of operation, while DC-link Voltage and rating of power devices decreased by 50% comparing to the traditional three-level converter systems. Consequently its effectiveness is evaluated by simulation tests based on a 42-kW prototype generator.

P N Tekwani - One of the best experts on this subject based on the ideXlab platform.

  • twelve sided polygonal Voltage space vector based multilevel inverter for an induction motor drive with Common Mode Voltage elimination
    IEEE Transactions on Industrial Electronics, 2007
    Co-Authors: Sanjay Lakshminarayanan, Gopal Mondal, P N Tekwani, K K Mohapatra, K Gopakumar
    Abstract:

    In this paper, a 12-sided polygonal Voltage space vector generation with Common-Mode Voltage elimination (CME) is proposed for an induction motor drive. An open-end winding configuration is used for the motor. The proposed multilevel structure is achieved by cascading only the conventional two-level inverters with asymmetrical dc link Voltages. By appropriately selecting the Voltage vectors with identical Common-Mode Voltage from the opposite ends, a pulsewidth modulation (PWM) strategy with zero Common-Mode Voltage variation can be achieved for the entire modulation range with a Common dc link requirement for both the inverter systems. Along with the CME, the proposed 12-sided polygonal space vector based multilevel inverter structure has increased modulation range with the absence of 5th, 7th, 17th, 19th, etc., harmonics up to 12-step operation. The bandwidth problems associated with conventional hexagonal Voltage space vector structure current controllers due to the presence of 5th and 7th harmonics in the overmodulation region are absent in the present 12-sided structure. So a simple PWM Voltage control with linear Voltage control up to 12-step operation is possible from the present 12-sided scheme with less current control complexity.

  • a reduced switch count five level inverter with Common Mode Voltage elimination for an open end winding induction motor drive
    IEEE Transactions on Industrial Electronics, 2007
    Co-Authors: Gopal Mondal, P N Tekwani, K Gopakumar, E Levi
    Abstract:

    The paper presents a five-level inverter scheme with reduced power circuit complexity for an induction motor drive. The scheme is realized by cascading conventional two-level and three-level neutral point clamped inverters in conjunction with an open-end winding three-phase induction motor drive. An inverter control scheme with Common-Mode Voltage (CMV) elimination, along with a simple DC link Voltage control, is developed by using only switching states with zero CMV for the entire modulation range. Theoretical considerations are experimentally verified for a variety of operating conditions.

  • 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, 2006
    Co-Authors: R S Kanchan, P N Tekwani, K Gopakumar
    Abstract:

    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

  • Three-level inverter configuration with Common-Mode Voltage elimination for induction motor drive
    IEE Proceedings - Electric Power Applications, 2005
    Co-Authors: R S Kanchan, P N Tekwani, A. Pittet
    Abstract:

    A scheme for a three-level Voltage space phasor generation with Common-Mode Voltage elimination is proposed. An open-end-winding induction motor, fed from both ends by two three-level inverters, which are realised by a cascading two two-level inverter, is used in this configuration. The Voltage space vectors of individual three-level inverters, which generate the same Common-Mode Voltage in the inverter pole Voltage, are variously grouped. When these Voltage space vectors are used to switch individual three-level inverters, it results in zero Common-Mode Voltage across the motor windings. In the proposed scheme, Voltage space phasors from individual inverters with zero Common-Mode Voltage in the inverter pole Voltage are used for PWM control. For the proposed drive configuration, the DC link Voltage requirement is only half when compared to the DC link Voltage of a conventional neutral-point-clamped (NPC) three-level inverter. The proposed inverter configuration offers reduced circuit and control complexity when compared to similar schemes with NPC or H-bridge inverter configurations.

Gopal Mondal - One of the best experts on this subject based on the ideXlab platform.

  • Three-level inverter scheme with reduced power device count for an induction motor drive with Common-Mode Voltage elimination
    Iet Power Electronics, 2008
    Co-Authors: Sheron Figarado, Tanmoy Bhattacharya, Gopal Mondal
    Abstract:

    A three-level inverter scheme with Common-Mode Voltage elimination and reduced power device count for dual inverter-fed open-end winding induction motor is proposed. The open-end winding induction motor is fed by two three-level inverters, formed by cascading two two-level inverters, from both sides. These two three-level inverters share the top inverter, thereby reducing the power device count. The switching states with zero Common-Mode Voltage variation are selected for pulse-width modulated switching so that there is no alternating Common- Mode Voltage in the pole Voltages and phase Voltages. Only two DC links, with half the ratings of a conventional three-level neutral point clamped inverter, are used for the proposed scheme.

  • twelve sided polygonal Voltage space vector based multilevel inverter for an induction motor drive with Common Mode Voltage elimination
    IEEE Transactions on Industrial Electronics, 2007
    Co-Authors: Sanjay Lakshminarayanan, Gopal Mondal, P N Tekwani, K K Mohapatra, K Gopakumar
    Abstract:

    In this paper, a 12-sided polygonal Voltage space vector generation with Common-Mode Voltage elimination (CME) is proposed for an induction motor drive. An open-end winding configuration is used for the motor. The proposed multilevel structure is achieved by cascading only the conventional two-level inverters with asymmetrical dc link Voltages. By appropriately selecting the Voltage vectors with identical Common-Mode Voltage from the opposite ends, a pulsewidth modulation (PWM) strategy with zero Common-Mode Voltage variation can be achieved for the entire modulation range with a Common dc link requirement for both the inverter systems. Along with the CME, the proposed 12-sided polygonal space vector based multilevel inverter structure has increased modulation range with the absence of 5th, 7th, 17th, 19th, etc., harmonics up to 12-step operation. The bandwidth problems associated with conventional hexagonal Voltage space vector structure current controllers due to the presence of 5th and 7th harmonics in the overmodulation region are absent in the present 12-sided structure. So a simple PWM Voltage control with linear Voltage control up to 12-step operation is possible from the present 12-sided scheme with less current control complexity.

  • a reduced switch count five level inverter with Common Mode Voltage elimination for an open end winding induction motor drive
    IEEE Transactions on Industrial Electronics, 2007
    Co-Authors: Gopal Mondal, P N Tekwani, K Gopakumar, E Levi
    Abstract:

    The paper presents a five-level inverter scheme with reduced power circuit complexity for an induction motor drive. The scheme is realized by cascading conventional two-level and three-level neutral point clamped inverters in conjunction with an open-end winding three-phase induction motor drive. An inverter control scheme with Common-Mode Voltage (CMV) elimination, along with a simple DC link Voltage control, is developed by using only switching states with zero CMV for the entire modulation range. Theoretical considerations are experimentally verified for a variety of operating conditions.

E Levi - One of the best experts on this subject based on the ideXlab platform.