Lesson 2 Chapter Four
Power Factor Improvement, Harmonic Reduction, Filter
Instructional Objectives
Study of the following:
• Schemes for the improvement of power factor in AC-DC converters.
• Methods for harmonic reduction in the current waveforms of the converters.
• Types of filters used to obtain ripple free (dc) output voltage and currents, reducing the harmonics.
Introduction
After the discussion of various types of ac to dc converters (rectifiers), both single- and three-phase, the drop in the output voltage due to the commutation overlap in the converter, was presented, the inductance on the source (ac) side being taken into account, in the previous lesson.
Three important points – power factor improvement, harmonic reduction, and filters, as applicable to converters, are described. The three schemes for power factor improvement are discussed. Then, the use of various filters to reduce the harmonics in the output voltage and current waveforms, are presented. Lastly, the harmonic reduction techniques are taken up, in brief. In all these cases, the circuit of a single phase full wave half (semi) controlled bridge converter (ac-dc) is used mostly as an example.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .