The Experts below are selected from a list of 144 Experts worldwide ranked by ideXlab platform

Mohamed S Zaky - One of the best experts on this subject based on the ideXlab platform.

  • power factor correction of three Phase pwm ac chopper fed induction motor drive system using hbcc technique
    IEEE Access, 2019
    Co-Authors: Mohamed K Metwaly, Haitham Z Azazi, Said A Deraz, Mohammed E Dessouki, Mohamed S Zaky
    Abstract:

    In this paper, a new control strategy for an induction motor (IM) drive system fed from three-Phase pulse width modulation (PWM) ac chopper is proposed. The main objective of the proposed control scheme is to achieve input power factor correction (PFC) of the IM drive system under different operating conditions. PFC is achieved by continuously forcing the actual three-Phase Supply currents with the corresponding reference currents, which are generated in Phase with the Supply voltages, using hysteresis band current control (HBCC) technique. The proposed control strategy has two loops: the inner loop and outer loop. The output of the outer loop is the magnitude of the Supply reference current resulting from either speed controller or startup controller, whereas the output of the inner loop is PWM signals of the ac chopper. The proposed ac chopper features a smaller number of active semiconductor switches, four IGBTs, with only two PWM gate signals. As a result, the proposed system is simple, reliable, highly efficient, and cost effective. Mathematical analysis of the drive system is presented. Components of the input LC filter are designed using frequency response. The IM drive system is modeled using MATLAB/SIMULINK, and a laboratory prototype was built and tested. The simulation and experimental results confirm the validity and robustness of the proposed control strategy.

Amritesh Kumar - One of the best experts on this subject based on the ideXlab platform.

  • cascaded multilevel active rectifier fed three Phase smart pump load on single Phase rural feeder
    IEEE Transactions on Power Electronics, 2017
    Co-Authors: Vishal Verma, Amritesh Kumar
    Abstract:

    Irrigation pumping system that marks a sizeable load on the grid is generally blind on assessment of peak demand hours, while in operation. Such operation if smartly controlled may avoid shedding of some connected loads to match power demand. Moreover, due to the accessibility of only single-Phase Supply, the rural pump three-Phase loads are supplied through either by splitting ac single Phase into three Phases or by single Phase ac–dc three-Phase ac conversion. Such configuration suffers from power quality problems, higher capacitor voltages, and common mode voltage problems, etc. A seven-level cascaded multilevel active rectifier (CMAR) is proposed here to provide power through three different dc links to reduce the voltage rating of capacitors, feed vector-controlled open end winding induction motor pump in addition to variable illumination LED lighting. The control employed for CMAR enhances the grid support operation by flexibly controlling power on the dc links. The control is invoked by adjusting the speed of the pump by sensing the grid frequency using droop characteristics thereby acting as smart pump load. The effectiveness of the proposed configuration and control is investigated both through simulation and experimentation on same scale hardware prototype.

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

  • power factor correction of three Phase pwm ac chopper fed induction motor drive system using hbcc technique
    IEEE Access, 2019
    Co-Authors: Mohamed K Metwaly, Haitham Z Azazi, Said A Deraz, Mohammed E Dessouki, Mohamed S Zaky
    Abstract:

    In this paper, a new control strategy for an induction motor (IM) drive system fed from three-Phase pulse width modulation (PWM) ac chopper is proposed. The main objective of the proposed control scheme is to achieve input power factor correction (PFC) of the IM drive system under different operating conditions. PFC is achieved by continuously forcing the actual three-Phase Supply currents with the corresponding reference currents, which are generated in Phase with the Supply voltages, using hysteresis band current control (HBCC) technique. The proposed control strategy has two loops: the inner loop and outer loop. The output of the outer loop is the magnitude of the Supply reference current resulting from either speed controller or startup controller, whereas the output of the inner loop is PWM signals of the ac chopper. The proposed ac chopper features a smaller number of active semiconductor switches, four IGBTs, with only two PWM gate signals. As a result, the proposed system is simple, reliable, highly efficient, and cost effective. Mathematical analysis of the drive system is presented. Components of the input LC filter are designed using frequency response. The IM drive system is modeled using MATLAB/SIMULINK, and a laboratory prototype was built and tested. The simulation and experimental results confirm the validity and robustness of the proposed control strategy.

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

  • reduced sensor configuration of brushless dc motor drive using a power factor correction based modified zeta converter
    Iet Power Electronics, 2014
    Co-Authors: Vashist Bist, Bhim Singh
    Abstract:

    This study deals with the design and development of a power factor (PF) correction-based modified-zeta converter fed brushless DC (BLDC) motor drive. A single-Phase Supply followed by a diode bridge rectifier and a modified-zeta converter operating in discontinuous inductor current mode (DICM) is used to feed a voltage source inverter (VSI) driving a BLDC motor. The modified-zeta converter operating in DICM acts as an inherent PF pre-regulator. A single-voltage sensor is used for the DC-link voltage control, which is used to control the speed of the BLDC motor. This facilitates the operation of VSI in fundamental frequency switching for reducing the switching losses in VSI. The proposed BLDC motor drive is designed and its performance is simulated in MATLAB/Simulink environment for achieving an improved power quality at AC mains for wide range of speed control. The obtained power quality indices are under the recommended limits of international power quality standard IEC 61000-3-2. Finally, the performance of the proposed drive is validated with test results obtained on a developed prototype of the proposed BLDC motor drive.

  • A single sensor based PFC Zeta converter Fed BLDC motor drive for fan applications
    2012 IEEE Fifth Power India Conference, 2012
    Co-Authors: Bhim Singh, Vashist Bist
    Abstract:

    A novel PFC (Power Factor Corrected) Converter using Zeta DC-DC converter feeding a BLDC (Brush Less DC) motor drive using a single voltage sensor is proposed for fan applications. A single Phase Supply followed by an uncontrolled bridge rectifier and a Zeta DC-DC converter is used to control the voltage of a DC link capacitor which is lying between the Zeta converter and a VSI (Voltage Source Inverter). Voltage of a DC link capacitor of Zeta converter is controlled to achieve the speed control of BLDC motor. The Zeta converter is working as a front end converter operating in DICM (Discontinuous Inductor Current Mode) and thus using a voltage follower approach. The DC link capacitor of the Zeta converter is followed by a VSI which is feeding a BLDC motor. A sensorless control of BLDC motor is used to eliminate the requirement of Hall Effect position sensors. A MATLAB/ Simulink environment is used to simulate the developed model to achieve a wide range of speed control with high PF (power Factor) and improved PQ (Power Quality) at the Supply.

  • an improved control algorithm of shunt active filter for voltage regulation harmonic elimination power factor correction and balancing of nonlinear loads
    IEEE Transactions on Power Electronics, 2000
    Co-Authors: Ambrish Chandra, Bhim Singh, B N Singh, Kamal Alhaddad
    Abstract:

    This paper deals with an implementation of a new control algorithm for a three-Phase shunt active filter to regulate load terminal voltage, eliminate harmonics, correct Supply power-factor, and balance the nonlinear unbalanced loads. A three-Phase insulated gate bipolar transistor (IGBT) based current controlled voltage source inverter (CC-VSI) with a DC bus capacitor is used as an active filter (AF). The control algorithm of the AF uses two closed loop PI controllers. The DC bus voltage of the AF and three-Phase Supply voltages are used as feedback signals in the PI controllers. The control algorithm of the AF provides three-Phase reference Supply currents. A carrier wave pulse width modulation (PWM) current controller is employed over the reference and sensed Supply currents to generate gating pulses of IGBTs of the AF. Test results are presented and discussed to demonstrate the voltage regulation, harmonic elimination, power-factor correction and load balancing capabilities of the AF system.

Freddy Magnussen - One of the best experts on this subject based on the ideXlab platform.

  • six Phase Supply feasibility using a pm fractional slot dual winding machine
    IEEE Transactions on Industry Applications, 2011
    Co-Authors: Massimo Barcaro, Nicola Bianchi, Freddy Magnussen
    Abstract:

    The growing interest in fault-tolerant drives requires new solutions avoiding the adoption of custom and expensive configurations. The machine with a dual three-Phase winding is an interesting candidate. It is provided with two windings, each of them fed by one converter of half power. With a proper mechanical and electrical arrangement, the machine can be exactly a six-Phase machine, obtaining higher performance during healthy conditions. In the event of a fault, one of the two three-Phase windings (the faulty one) is disconnected, and the machine is operated by means of the healthy winding only. This paper analyzes the feasibility of this dual winding configuration applied to a nonoverlapped-coil fractional-slot winding permanent-magnet machine. The star of slots is applied to highlight the proper winding candidates. The more interesting windings are deeply analyzed.

  • six Phase Supply feasibility using a pm fractional slot dual winding machine
    Energy Conversion Congress and Exposition, 2010
    Co-Authors: Massimo Barcaro, Nicola Bianchi, Freddy Magnussen
    Abstract:

    The growing interest on fault tolerant drives requires new solutions avoiding the adoption of custom and expensive configurations. The machine with a dual three-Phase winding is an interesting candidate. It is provided of two windings, each of them fed by one converter of half power. In the event of fault, one of the two three-Phase windings (the faulty one) is disconnected and the machine is operated by means of the healthy winding only. With a proper mechanical and electrical arrangement the machine can be exactly a six-Phase machine, obtaining higher performance during healthy conditions. The paper analyzes the feasibility of this dual winding configuration applied to a non-overlapped coils fractional-slot winding permanent magnet (PM) machine. The star of slots is applied to highlight the proper winding candidates. The more interesting windings are deeply analyzed.