Design and Control of 18 Pulse Variable Frequency Drive

Abstract

As the demands of industrial needs change, so do the outputs of our basic electrical prime movers, such as motors. DC motors are easier to regulate than AC motors, but they have their own restrictions as capacity increases. In contrast, AC motors, particularly squirrel cage induction motors, are more cost-effective, but speed control is difficult because the supply frequency must be changed. With today's technical advancements in driving systems, controlling AC motors is more cost-effective, simple to use, and allows you to regulate the range of speed below and above the base speed. These drives may radically modify the voltage and frequency that is provided to the motor based on the requirements using a technology called Pulse Width Modulation (PWM). These devices are becoming increasingly popular as a result of their user-friendly features and low cost. Because the Variable Frequency Devices use an embedded technology, they may be programmed for automatic control and computer interface, decreasing the need for manual intervention. Variable Frequency Drives have become increasingly popular in HVAC applications. VFDs are commonly used in air handlers, chillers, pumps, and tower fans. Improved understanding of Variable Frequency Drives leads to improved usage and determination of some appliances and High Voltage AC systems. The major goal of this dissertation is to provide a fundamental understanding of operations, terminologies, energy savings, and power factors, as well as harmonics reduction using VFD and a simulation project to demonstrate how VFD is good for energy savings. In addition, this article will compare and contrast Variable Frequency Drives and other technologies in terms of industrial standards.