Comparative Study of PWM Technique for Switching Loss Reduction and Acoustic Noise Reduction in VSI-Fed Drives Tarang Kalaria, Tapankumar Trivedi, Vinod Patel, Rajendrasinh Jadeja and Chandresh Patel Abstract Variable-frequency drives (VFDs) are widely used in the industry and off- grid PV-based pumping applications due to their versatile operation. The operating performance of VFDs in the given environment is mainly affected by switching losses and generation of acoustic noise. During the development of PWM techniques of VSI, both the attributes are considered separately. In this paper, different methods aimed at switching loss reduction and acoustic noise reduction are reported so that both the operating requirement of drives are satisfied. Different bus clamping methods such as DPWM0, DPWM1, DPWM2, and DPWM3 are studied and compared. Simulation results demonstrate the effectiveness of these schemes in reducing inverter switching losses and reducing acoustic noise of variable-frequency drive. 1 Introduction Nowadays, voltage-source inverters have become popular in many industrial drive applications. Adjustable speed drive (ASD) applications require variable-voltage variable-frequency output which is obtained from PWM-VSI. The off-grid PV-based pumping applications have necessitated reduction in losses and thereby maximizing utilization of installation. Numerous modulation schemes are available to accomplish task of obtaining variable-frequency variable-voltage output from inverter. T. Kalaria · T. Trivedi (B ) · R. Jadeja Electrical Engineering Department, Marwadi Education Foundations Group of Institutions, Rajkot, India e-mail: tapankumar.trivedi@marwadieducation.edu.in R. Jadeja e-mail: rajendrasinh.jadeja@marwadieducation.edu.in V. Patel · C. Patel Amtech Electronics Pvt. Ltd, Gandhinagar, India e-mail: vinodp@amtechelectronics.com © Springer Nature Singapore Pte Ltd. 2020 A. N. R. Reddy et al. (eds.), Intelligent Manufacturing and Energy Sustainability, Smart Innovation, Systems and Technologies 169, https://doi.org/10.1007/978-981-15-1616-0_14 147