VCA-APF/SVG

From the experience of European harmonic control, the harmonic only appeared in a few areas at the beginning, and the impact was relatively small, which did not attract attention. Until the harmonic phenomenon became more and more common, and caused major equipment damage, power supply interruption and economic losses, the harmonic control was strengthened. At present, in Europe, America, Japan and other developed countries, harmonic control has been more common.