A. Agarwal

Motilal Nehru National Institute of Technology, Allahābād, Uttar Pradesh, India

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Publications (6)0 Total impact

  • M. Raghuram, R. K. Jarial, A. Agarwal
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    ABSTRACT: Using single phase matrix converter topology a circuit is developed to perform the operations such as step-up cycloconverter, step-down cycloconverter, ac voltage regulator, rectifier, inverter and chopper collectively called as multi-converter circuit. IGBT with antiparallel diode is used as a switching device for controlling current waveform. This paper presents an operation with Symmetrical angle-PWM scheme for controlling the matrix topology circuit. Simulation were carried out using MATLAB/Simulink software, results of simulation are presented to evaluate the behavior and feasibility of proposed technology. The operation of proposed system has been found satisfactory.
    2014 Students Conference on Engineering and Systems (SCES); 05/2014
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    ABSTRACT: This paper presents the control of elevator system using Siemens LOGO PLC. The system is programmed to drive a dc motor for forward and backward motoring mode with sensors at each floor, emergency STOP switch for maintenance purpose or to prevent any accident inside the lift & door switch for safety purpose. The system is also programmed to conserve energy by automatically switch off lights and fans of cabin when motor is in rest state for a specified duration of time. The software used in this elevator system is LOGO! Soft Comfort V7.0. This system can be used for learning the control strategies involved in elevator systems for educational purpose.
    Engineering and Systems (SCES), 2013 Students Conference on; 01/2013
  • A. Agarwal, V. Agarwal
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    ABSTRACT: A cycloinverter has been analyzed using two modulation techniques namely delta modulation (DM) and trapezoidal modulation (TM). Field Programmable Gate Array based digital controller has been developed to generate the trigger pulses for cycloinverter using Hardware Description Language. Lowest THD has been found to 2.5% for DM and 5% for TM when modulation index m = 1. There is no specific pattern for the value of THD for different value of frequencies but still DM is better as compared to TM. The circuit has been tested qualitatively by observing various waveforms on DSO. Tests have been carried out to show the effectiveness and flexibility of the proposed method.
    Energy Conversion Congress and Exposition (ECCE), 2013 IEEE; 01/2013
  • P. Agarwal, A. Agarwal, V. Agarwal
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    ABSTRACT: Frequency converter may be used to control the speed of AC motors, in airline industries, induction heating, fluorescent lighting, ballast, high frequency power supplies and so on. It has a advantage of eliminating one or more intermediate converters. The use of self-commutated switches with PWM control can significantly improve the performance of frequency converter. This paper presents FPGA based space vector modulated (SVM) trigger controller applied to a frequency converter where trigger pulses are generated Hardware Description Language VHDL in Xilinx. The output waveforms have been synthesized for different value of output frequency. The trigger circuit has been tested qualitatively by observing various triggering pulses on Xilinx ISE simulator and then verified with experimental results. The operation of proposed system has been found satisfactory.
    Telecommunications Energy Conference (INTELEC), 2011 IEEE 33rd International; 01/2011
  • A. Agarwal, V. Agarwal
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    ABSTRACT: Trapezoidal modulation technique has been applied in AC to AC converter to reduce harmonics in the output. Both step up and step down operation of the converter has been studied for different output frequencies. Simulation results are shown for single-phase to single-phase converter configuration using the software SIMULINK. Minimum total harmonic distortion in the output has been found to be 5% for cyclo-inverter operation for a frequency range of 500 to 750 Hz. During cyclo-converter operation it reduces to 1.2% up to a frequency range of 1 Hz to 16.66 Hz which is generally recommended mode of cyclo-converter.
    Power Systems, 2009. ICPS '09. International Conference on; 01/2010
  • P. Agarwal, A. Agarwal, V. Agarwal
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    ABSTRACT: This paper proposes FPGA based space vector modulated (SVM) trigger controller that may be applied to a frequency converter used for high speed electrical drives, speed control of AC motor, induction heating, fluorescent lighting, ballast, high frequency power supplies and so on. To generate space vector pulse width modulated trigger pulses for the converter pperipheral input-output and FPGA interfacing has been developed through Xilinx 9.2i. In order to relieve the controller from the time consuming computational task of PWM signal generation, method of space vector PWM signal generation is implemented on FPGA using Hardware Description Language VHDL in Xilinx. Simulated results are shown on ISE-Simulator and they are found to be satisfactory.
    Power, Control and Embedded Systems (ICPCES), 2010 International Conference on; 01/2010