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Control Techniques for Accessory Power Unit Employed in Hybrid Electric Vehicle to Reduce the Torque Pulsations and Vibrations

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A multilevel inverter is a power electronic Accessory Power Unit (APU) built to synthesize a desired AC voltage from several levels of DC voltages. Hybrid Electric Vehicles (HEVs) work through a combination of an internal combustion engine, a bank of batteries, and an electric motor. In fact, the concept is so advantageous that several major drives manufacturers have obtained recent patents on APU and associated switching techniques. For this reason, the investigation of methods to increase the reliability of APU is of high interest. It is evident that the multilevel concept will be a prominent choice for power electronic systems in future years. This paper proposes a comparison between different switching strategies for APU, based on Sinusoidal Pulse Width Modulation (SPWM) and Space Vector Modulation (SVM). The work strives hard to present the scrutiny that has been made between different open loop Pulse Width Modulation (PWM) control techniques for multilevel based APU. The comparison is made in terms of Total Harmonic Distortion (THD), switching frequency, fundamental and harmonic RMS of the voltage and current. The quality of output waveforms eliminates the torque pulsations and hence the vibrations of the electrical drive, which is a critical parameter for the smoothness of HEVs.
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Hybrid Electric Vehicle; Multilevel Inverter; Photo Voltaic; Sinusoidal Pulse Width Modulation

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