• Bhagyashri R. Gawai
• Prof. N. A. Bodkhe

The purpose of this study is to examine the evolution of active power filter (APF) technologies, which are frequently employed to reduce harmonics in utility power lines. This review may also be classified as a "tutorial-type study," since it gives a comprehensive overview of APF technologies while avoiding the boring minutiae without losing sight of the primary point. It is anticipated that by taking this approach, more power engineering readers would become interested in this vital and rapidly developing area. The talk begins with a quick introduction of harmonic distortion issues and their effects on the quality of electric power. The functioning of typical APF topologies, such as shunt, series, and hybrid APFs, is well explained. A discussion of several sorts of reference signal estimate extraction methodologies follows. The use of the p-q and extension p-q theorems to extract the reference signals is discussed in depth, as they are the most often used in real APF systems. Finally, a summary of APF control techniques is given. There is also a brief description of the APF-solar photovoltaic system. Important references are provided at the conclusion of the text to aid readers who want to learn more about the subject. The application of new technical solutions such as Custom Power (CP) and Flexible AC Transmission Systems (FACTS) Devices has risen as the cost of power electronic devices has decreased and the efficiency of both power converters and energy storage components has improved. One of the CP devices is the Active Power Filter (APF), which may reduce harmonics, reactive power, and unbalanced load currents on the load side. The pros and cons of each offered approach are described in this research, which is a complete overview of APF investigations. The research also aids researchers in determining the best control techniques and power circuit layout for APF applications.

Active Power Filter, Power flow control

"Review: Active Power Filters for Power Quality Improvement ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 8, page no.a563-a570, August-2021, Available :http://www.jetir.org/papers/JETIR2108074.pdf

"Review: Active Power Filters for Power Quality Improvement ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 8, page no. ppa563-a570, August-2021, Available at : http://www.jetir.org/papers/JETIR2108074.pdf