Harmonic Analysis And Control For Communication Room's Power System

With the development of communications, especially in large and medium-sized communications building, there usually are dozens of power supply equipments in communication room, including large capacity UPS and switching power supply system. These nonlinear devices will produce a large number of harmonics, causing voltage and current distortion, which affect the safe operation of power and electrical equipment. Therefore, power researchers very concern about this problem.This article describes the common concepts and related harmonic standards, describes the mechanism of the main harmonic source.This article analyze the specific harmonic problems of communication room, such as UPS and generator's matching capacity; distribution transformer capacity and wiring options; discussing how to control the harmonic amplified by capacitors; the impact of harmonic on cable and circuit breakers; proposing a reasonable way of grounding to improve the power supply environment, for interference on the communication equipments caused by the high ground zero which exists in the communication system.Discuss harmonic suppression, and propose the basic ideas of harmonic control combined with the characteristics of communication equipment operating. These are selecting the points, the way and the reasonable program of harmonic control. at last, verify the effect of harmonic control through the case.