Problems needing attention in calculation of emission limit of customer's harmonic current

摘要

There are strict limits provisions for the harmonic currents produced by distorting loads connected to the point of common coupling, the national standard GB/T14549-93 and IEC technical documents 61000-3-6 have given the limits for harmonic emission calculation methods. This paper describes these two calculation methods, the coincidence factor of high load distortion both in detail. This paper analyses and ascertains the problem related to customer protocol capacity and the total capacity of power supply proposed by some scholars.