Low-order current harmonics get injected back to the source voltage by the operation of the inverter. This means that two large capacitors are needed for filtering purposes in this design. If both switches in a leg were on at the same time, the DC source will be shorted out. Inverters can use several modulation techniques to control their switching schemes.
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Skvarenina, William E. DeWitt Purdue University Abstract This paper discusses the development of a new course combining topics from a conventional electromechanical energy conversion course with topics from controls and electrical distribution courses.
The paper begins with some background of why we developed the new course and the process that was used to develop it. The course topics and laboratory experiments are then described in some detail. Introduction Several years ago, our department began an intensive review of our entire curriculum, with an eye toward revising it to more directly meet the needs of employers for the next century.
The process began with a so-called ad hoc, radical curriculum review team. During the process, members of the Industrial Advisory Board IAB and graduates of our program out in industry were consulted to help shape the new plan of study.
For many years, the Purdue EET program prided itself as being one of only a few in the United States with a strong electric power program. The plan of study included a required electric motors course, which was organized in a traditional pattern of magnetics, DC machines, transformers, and AC machines. Electives included a course oriented toward electric utility operations generation and transmission , an electrical distribution course, 1 and two controls courses.
Despite this history, some faculty viewed the required course as a target for elimination, which would allow other topics to be included. Surprisingly, however, there were a few non- power faculty who felt the course should be kept exactly as it was.
Like others,2 we noticed the change in what was important to industry and how that differed from what was included in most undergraduate energy conversion courses. Our required course, as previously mentioned, covered DC machines before AC machines and generators before motors. Prior to the formation of the curriculum review team, we reversed the order of presentation of AC and DC machines and put more emphasis on motors as opposed to generators.
We felt this was appropriate because the vast majority of our graduates will encounter induction motor applications long before they use DC motors or generators of any sort We also added a lecture and laboratory covering variable speed drives since many motors are now connected to them to provide more efficient plant processes.
This constituted a good beginning, however, it was very Citation.
Electrical power and controls
About this title Broad in scope, yet deep in content, this book offers unique, single-volume coverage of machines, transformers, controls, and electrical power distribution. For electrical engineers, computer technology employees, mechanical engineers, and others in production or marketing fields. From the Inside Flap: PREFACE Over the past decade or so, communications, electronics, and power have converged to provide more efficient manufacturing processes for various types of industry. Many motors are installed with electronic drives; programmable logic controllers are finding widespread application; and communications networks at the device, control, and information levels are used to monitor many industrial processes. Engineers and technologists will require a broad background in all of these areas. Unfortunately, the time available in a typical curriculum is fixed, and in some cases the number of hours required for a degree has decreased.
ISBN 13: 9780131130456
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