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Different loads generate variety harmonic content which changes dynamically during different working conditions To meet IEEE ... 519 standard, we must cover 2rd to 50th harmonic compensation, output compensation current follows the system harmonic variation, devoted to green power quality This article is quoted from the harmonic standard "IEEE Std—2014 Recommended Practices and Requirements for Harmonic Control of Power Systems" revised in 2014 by the Institute of Power Electronics Engineers. If there are copyright issues, please contact to delete. The United States IEEE Std. 519-2014 on the harmonic standards of power grids is a relatively authoritative standard in the world, produced by the United States IEEE Power and Energy Society, it is used as a reference standard by many countries and regions around the world. Current distortion limits for systems rated 120 V through 69 kV The limits in this subclause apply to users connected to systems where the rated voltage at the PCC is 120 V to 69 kV. At the PCC, users should limit their harmonic currents as follows read more