A general review of power quality standards and terminologies V.A Deshmukh M.Tech scholar Department of electrical engineering Christian college of engineering and technology Bhilai,Chhattisgarh,India email-vdeshmukh203@gmail.com ORCID ID-https://orcid.org/0000-0001-6745-7062 B.Sridhar Assistant professor Department of electrical engineering Christian college of engineering and technology Bhilai,ChhattisgarhIndia email-burlasridhar@gmail.com ORCID ID-https://orcid.org/0000-0002-0234-5112 Abstract In the next few years, more than 80% of AC power is to be processed through power converters owing to their benefits of energy conservation, flexibility, network interconnection, and weight and volume reduction in a number of equipment such as lighting arrestors, HVAC computers, fans, and so on.This paper gives an introduction on power quality (PQ), causes and effects of power quality problems. It also deals with power quality definitions, terminologies, standards, bench-marks, monitoring requirements, financial loss, and analytical quantification. It also discusses various types of nonlinear loads, which cause these power quality problems, they are illustrated, classified, modeled, quantified, and analyzed forassociated power quality issues. Keywords: AC Power, convertors, power quality definitions terminologies standards benchmarks, power quality problems,nonlinear loads. Journal of University of Shanghai for Science and Technology ISSN: 1007-6735 Volume 23, Issue 12, December - 2021 Page-102