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G. Bhuvaneswari - One of the best experts on this subject based on the ideXlab platform.

  • a novel t connected autotransformer based 18 pulse ac dc converter for harmonic mitigation in adjustable speed induction motor drives
    IEEE Transactions on Industrial Electronics, 2007
    Co-Authors: Bhim Singh, V. Garg, G. Bhuvaneswari
    Abstract:

    This paper presents the design, analysis, and development of a novel autotransformer-based 18-pulse AC-DC converter with reduced kilovoltampere rating, feeding vector-controlled induction-motor drives (VCIMDs) for power-quality improvement at the point of common coupling (PCC). The proposed autotransformer consists of only two single-phase transformers for its realization against three single-phase transformers required in other configurations. The proposed 18-pulse AC-DC converter is suitable for retrofit applications, where, presently, a six-pulse Diode Bridge rectifier is being used. A set of power-quality parameters, such as total harmonic distortion (THD) and crest factor of AC mains current, power factor, displacement factor, and distortion factor at AC mains, THD of supply voltage at PCC, and DC-bus-voltage ripple factor for a VCIMD fed from an 18-pulse AC-DC converter, are computed to observe its performance. The presented design technique provides flexibility to give an average DC output from the proposed converter, which is the same as that of a conventional three-phase Diode Bridge rectifier. However, it is also possible to step-up or step-down the output voltage as required. The effect of load variation on VCIMD is also studied to observe the effectiveness of the proposed harmonic mitigator. A laboratory prototype of the proposed autotransformer-based 18-pulse AC-DC converter is developed to validate the design and simulation model.

  • star connected autotransformer based 30 pulse ac dc converter for power quality improvement in vector controlled induction motor drives
    2006 IEEE Power India Conference, 2006
    Co-Authors: Bhim Singh, G. Bhuvaneswari, V. Garg, Ambrish Chandra
    Abstract:

    This paper presents the design and analysis of an autotransformer based 30-pulse AC-DC converter feeding vector controlled induction motor drives. The proposed AC-DC converter is based on a star connected autotransformer, designed for producing 15-phase shifted AC voltages for effective harmonic reduction. The proposed 30-pulse AC-DC converter is suitable for retrofit applications, where, presently a six-pulse Diode Bridge rectifier is being used. The resulting supply current is near sinusoidal in shape with low total harmonic distortion (THD) of supply current and a nearly unity power factor. The effect of load variation on various power quality indices is also presented. The proposed AC-DC converter is found suitable for applications with large load variation and where harmonic reduction is stringent.

  • multipulse improved power quality ac dc convertors for vector controlled induction motor drives
    IEE Proceedings - Electric Power Applications, 2006
    Co-Authors: Bhim Singh, G. Bhuvaneswari, V. Garg
    Abstract:

    The paper deals with polygon autotransformer-based 12-pulse and 18-pulse AC–DC convertors feeding vector-controlled induction-motor drives (VCIMDs) for improving power quality at the point of common coupling (PCC). The design of autotransformers is carried out for proposed AC–DC convertors to make them suitable for retrofit applications, where at present a six-pulse Diode Bridge is used. The effect of load variation on VCIMD is also studied to demonstrate the effectiveness of proposed AC–DC convertors over a wide operating range. Laboratory prototypes of proposed autotransformer-based 12-pulse and 18-pulse AC–DC convertors are developed and test results are presented to validate the proposed design and model developed of the system.

Bhim Singh - One of the best experts on this subject based on the ideXlab platform.

  • improvement in harmonic reduction of a zigzag autoconnected transformer based 12 pulse Diode Bridge rectifier by current injection at dc side
    IEEE Transactions on Industry Applications, 2017
    Co-Authors: Vidyasagar Sheelvant, Bhim Singh, R. Kalpana, Prakash P Saravana
    Abstract:

    In this paper, to improve the harmonic reduction ability in the input line current of a 12-pulse Diode Bridge rectifier using zigzag autoconnected transformer with a dc side current injection technique is presented. Conventional 12-pulse rectifier does not meet the IEEE-519 standard and therefore current injection technique at dc side is used to shape the converter current to minimize the harmonic distortion in the input line current. The proposed converter configuration uses a zigzag autoconnected transformer with inherent ability to block zero-sequence components, which eliminates the requirement of a zero-sequence blocking transformer, and thereby reduces the overall rating of the converter. The current injection technique at dc side enables to alter the dc side currents, which further shapes the input line currents to near sinewave with total harmonic distortion of less than 1% and power factor close to unity. The proposed converter configuration is simulated and analyzed in MATLAB/Simulink. The effects of variation in the magnitude of injected current on the input line current harmonics in terms of power quality indices are analyzed. A prototype of the proposed converter configuration is developed, and experimental results are presented to validate the theoretical design, analysis, and simulation results.

  • a novel t connected autotransformer based 18 pulse ac dc converter for harmonic mitigation in adjustable speed induction motor drives
    IEEE Transactions on Industrial Electronics, 2007
    Co-Authors: Bhim Singh, V. Garg, G. Bhuvaneswari
    Abstract:

    This paper presents the design, analysis, and development of a novel autotransformer-based 18-pulse AC-DC converter with reduced kilovoltampere rating, feeding vector-controlled induction-motor drives (VCIMDs) for power-quality improvement at the point of common coupling (PCC). The proposed autotransformer consists of only two single-phase transformers for its realization against three single-phase transformers required in other configurations. The proposed 18-pulse AC-DC converter is suitable for retrofit applications, where, presently, a six-pulse Diode Bridge rectifier is being used. A set of power-quality parameters, such as total harmonic distortion (THD) and crest factor of AC mains current, power factor, displacement factor, and distortion factor at AC mains, THD of supply voltage at PCC, and DC-bus-voltage ripple factor for a VCIMD fed from an 18-pulse AC-DC converter, are computed to observe its performance. The presented design technique provides flexibility to give an average DC output from the proposed converter, which is the same as that of a conventional three-phase Diode Bridge rectifier. However, it is also possible to step-up or step-down the output voltage as required. The effect of load variation on VCIMD is also studied to observe the effectiveness of the proposed harmonic mitigator. A laboratory prototype of the proposed autotransformer-based 18-pulse AC-DC converter is developed to validate the design and simulation model.

  • star connected autotransformer based 30 pulse ac dc converter for power quality improvement in vector controlled induction motor drives
    2006 IEEE Power India Conference, 2006
    Co-Authors: Bhim Singh, G. Bhuvaneswari, V. Garg, Ambrish Chandra
    Abstract:

    This paper presents the design and analysis of an autotransformer based 30-pulse AC-DC converter feeding vector controlled induction motor drives. The proposed AC-DC converter is based on a star connected autotransformer, designed for producing 15-phase shifted AC voltages for effective harmonic reduction. The proposed 30-pulse AC-DC converter is suitable for retrofit applications, where, presently a six-pulse Diode Bridge rectifier is being used. The resulting supply current is near sinusoidal in shape with low total harmonic distortion (THD) of supply current and a nearly unity power factor. The effect of load variation on various power quality indices is also presented. The proposed AC-DC converter is found suitable for applications with large load variation and where harmonic reduction is stringent.

  • multipulse improved power quality ac dc convertors for vector controlled induction motor drives
    IEE Proceedings - Electric Power Applications, 2006
    Co-Authors: Bhim Singh, G. Bhuvaneswari, V. Garg
    Abstract:

    The paper deals with polygon autotransformer-based 12-pulse and 18-pulse AC–DC convertors feeding vector-controlled induction-motor drives (VCIMDs) for improving power quality at the point of common coupling (PCC). The design of autotransformers is carried out for proposed AC–DC convertors to make them suitable for retrofit applications, where at present a six-pulse Diode Bridge is used. The effect of load variation on VCIMD is also studied to demonstrate the effectiveness of proposed AC–DC convertors over a wide operating range. Laboratory prototypes of proposed autotransformer-based 12-pulse and 18-pulse AC–DC convertors are developed and test results are presented to validate the proposed design and model developed of the system.

Lei Gao - One of the best experts on this subject based on the ideXlab platform.

  • A 36-Pulse Diode-Bridge Rectifier Using Dual Passive Harmonic Reduction Methods at DC Link
    IEEE Transactions on Power Electronics, 2019
    Co-Authors: Lei Gao, Zhongcheng Man, Junyuan Lee
    Abstract:

    In order to simultaneously reduce the harmonics of input line current and ripple of load voltage in multipulse Diode-Bridge rectifier, this paper proposes a 36-pulse rectifier using dual passive harmonic reduction methods at dc link. The proposed rectifier combines a 12-pulse rectifier and a multiwinding interphase reactor (IPR). The primary winding of the multiwinding IPR and two Diodes constitute the double-tapped IPR, which is named as the first harmonic reduction method; the secondary winding of the multiwinding IPR and a single-phase Diode-Bridge rectifier formulate the second harmonic reduction method. When the multiwinding IPR is designed optimally, the pulse number of load voltage and step number of input line current can be increased from 12 to 24 by using the first method and from 24 to 36 by using the second method. The operation of the multiwinding IPR is analyzed, and the optimal turn ratio of the multiwinding IPR is obtained from the perspective of minimizing the total harmonic distortion of input line current. When the multiwinding IPR is designed optimally, both the pulse number of load voltage and step number of input line current are 36 per power supply cycle. Compared with the 12-pulse rectifier, in the proposed rectifier, the harmonics of input line current and ripple of load voltage are reduced significantly. The proposed rectifier is simpler and easier to realize than other methods. Some simulation and experiments are carried out to validate the theoretical analysis.

  • active harmonic reduction for 12 pulse Diode Bridge rectifier at dc side with two stage auxiliary circuit
    IEEE Transactions on Industrial Informatics, 2015
    Co-Authors: Fangang Meng, Shiyan Yang, Wei Yang, Lei Gao
    Abstract:

    A 12-pulse Diode Bridge rectifier is often used in high-power rectification. However, the total harmonic distortion (THD) of input line current in 12-pulse rectifier does not meet the IEEE-519 standard. In order to reduce the harmonics to an acceptable level, we use a two-stage auxiliary circuit at dc side of the 12-pulse rectifier to eliminate harmonics actively. The effect of the auxiliary circuit's parameter on the system performance is analyzed first, which indicates the necessity of applying two-stage auxiliary circuit. The front-stage auxiliary circuit plays a role in producing circulating current to cancel harmonics, and the back stage adjusts the output voltage of the front stage and feeds the power absorbed by the front stage to load in accordance with load current and input voltage of 12-pulse rectifier. Besides the good performance in harmonic elimination, the proposed auxiliary circuit has low kilovolt ampere rating.

V. Garg - One of the best experts on this subject based on the ideXlab platform.

  • a novel t connected autotransformer based 18 pulse ac dc converter for harmonic mitigation in adjustable speed induction motor drives
    IEEE Transactions on Industrial Electronics, 2007
    Co-Authors: Bhim Singh, V. Garg, G. Bhuvaneswari
    Abstract:

    This paper presents the design, analysis, and development of a novel autotransformer-based 18-pulse AC-DC converter with reduced kilovoltampere rating, feeding vector-controlled induction-motor drives (VCIMDs) for power-quality improvement at the point of common coupling (PCC). The proposed autotransformer consists of only two single-phase transformers for its realization against three single-phase transformers required in other configurations. The proposed 18-pulse AC-DC converter is suitable for retrofit applications, where, presently, a six-pulse Diode Bridge rectifier is being used. A set of power-quality parameters, such as total harmonic distortion (THD) and crest factor of AC mains current, power factor, displacement factor, and distortion factor at AC mains, THD of supply voltage at PCC, and DC-bus-voltage ripple factor for a VCIMD fed from an 18-pulse AC-DC converter, are computed to observe its performance. The presented design technique provides flexibility to give an average DC output from the proposed converter, which is the same as that of a conventional three-phase Diode Bridge rectifier. However, it is also possible to step-up or step-down the output voltage as required. The effect of load variation on VCIMD is also studied to observe the effectiveness of the proposed harmonic mitigator. A laboratory prototype of the proposed autotransformer-based 18-pulse AC-DC converter is developed to validate the design and simulation model.

  • star connected autotransformer based 30 pulse ac dc converter for power quality improvement in vector controlled induction motor drives
    2006 IEEE Power India Conference, 2006
    Co-Authors: Bhim Singh, G. Bhuvaneswari, V. Garg, Ambrish Chandra
    Abstract:

    This paper presents the design and analysis of an autotransformer based 30-pulse AC-DC converter feeding vector controlled induction motor drives. The proposed AC-DC converter is based on a star connected autotransformer, designed for producing 15-phase shifted AC voltages for effective harmonic reduction. The proposed 30-pulse AC-DC converter is suitable for retrofit applications, where, presently a six-pulse Diode Bridge rectifier is being used. The resulting supply current is near sinusoidal in shape with low total harmonic distortion (THD) of supply current and a nearly unity power factor. The effect of load variation on various power quality indices is also presented. The proposed AC-DC converter is found suitable for applications with large load variation and where harmonic reduction is stringent.

  • multipulse improved power quality ac dc convertors for vector controlled induction motor drives
    IEE Proceedings - Electric Power Applications, 2006
    Co-Authors: Bhim Singh, G. Bhuvaneswari, V. Garg
    Abstract:

    The paper deals with polygon autotransformer-based 12-pulse and 18-pulse AC–DC convertors feeding vector-controlled induction-motor drives (VCIMDs) for improving power quality at the point of common coupling (PCC). The design of autotransformers is carried out for proposed AC–DC convertors to make them suitable for retrofit applications, where at present a six-pulse Diode Bridge is used. The effect of load variation on VCIMD is also studied to demonstrate the effectiveness of proposed AC–DC convertors over a wide operating range. Laboratory prototypes of proposed autotransformer-based 12-pulse and 18-pulse AC–DC convertors are developed and test results are presented to validate the proposed design and model developed of the system.

F.c. Zach - One of the best experts on this subject based on the ideXlab platform.

  • a novel three phase utility interface minimizing line current harmonics of high power telecommunications rectifier modules
    IEEE Transactions on Industrial Electronics, 1997
    Co-Authors: Johann Walter Kolar, F.c. Zach
    Abstract:

    Based on the combination of a three-phase Diode Bridge and a DC/DC boost converter, a new three-phase three-switch three-level pulsewidth modulated (PWM) rectifier system is developed. It can be characterized by sinusoidal mains current consumption, controlled output voltage, and low-blocking voltage stress on the power transistors. The application could be, e.g., for feeding the DC link of a telecommunications power supply module. The stationary operational behavior, the control of the mains currents, and the control of the output voltage are analyzed. Finally, the stresses on the system components are determined by digital simulation and compared to the stresses in a conventional six-switch two-level PWM rectifier system.

  • a novel three phase utility interface minimizing line current harmonics of high power telecommunications rectifier modules
    International Telecommunications Energy Conference, 1994
    Co-Authors: Johann Walter Kolar, F.c. Zach
    Abstract:

    Based on the combination of a three-phase Diode Bridge and DC/DC boost converter a new three-phase three-switch three-level PWM rectifier system is developed. It can be characterized by sinusoidal mains current consumption, controlled output voltage and low blocking voltage stress on the power transistors. The application could be, e.g., for feeding the DC link of a telecommunications power supply module. The stationary operational behavior, the control of the mains currents and of the output voltage are analyzed. Finally, the stresses on the system components are determined by digital simulation and compared to the stresses in a conventional PWM rectifier system. >