Power Quality Analysis Using Various Computational Techniques for Induction Machines

Induction motor drives are the most popular workhorse required for industrial, medical, and healthcare advances. Ensuring the presence of uninterrupted and harmonic-free electric power in laboratories and operating rooms is critically important for safeguarding patients and preventing infection. In commercial sectors, the three-phase induction motors are rugged, cost effective, and highly reliable. In order to achieve good performance of industrial motor drives, many pulse-width modulation (PWM) techniques have been proposed. Current research mainly deals with the influence of supply distortion on the performance of such drives. It is achieved by implementing a switching control through two PWM techniques, namely sine PWM (SPWM) and discrete space vector PWM (DSVPWM). Although both techniques are capable of generating balanced output currents and voltages with less distortion, the DSVPWM technique is superior to SPWM in achieving more precise and balanced output waveforms under different loading patterns. Furthermore, power quality (PQ) assessment and its comparative analysis were presented through MATLAB simulations. Additionally, total harmonic distortion (THD) and DC-offset values are calculated at various points of common coupling (PCCs), using the MECO Instruments Power and Harmonics Analyzer PHA 5850. A passive filter has been designed, which mitigates 3rd and 5th harmonics from three-phase line currents and voltages. Experimental results confirm and justify the increased effectiveness of the two techniques, demonstrating the superiority of DSVPWM over SPWM in reducing the harmonics and DC-offset, and in providing three-phase balanced output voltages and currents at outputs. Important applications and scope of the drive systems for research engineers and medical professionals include patient handling systems, portable artificial hearts, indoor/outdoor air handling units, and implantable devices (motors used in blood pumps). Induction motor drives are the most popular workhorse required for industrial, medical, and healthcare advances. Ensuring the presence of uninterrupted and harmonic-free electric power in laboratories and operating rooms is critically important for safeguarding patients and preventing infection. This chapter aims to make medical professionals, who work in patient monitoring, with respect to the conduct of postoperative therapies, irradiation techniques, and wound management, aware of the power quality (PQ) aspects of three-phase I