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The first active AC filter at an HVDC station was installed by Siemens in 1998 in the HVDC Converter Station of Tjele, in Denmark as a demonstration project. This active filter used a 0.6 MVA IGBT converter. This paper introduces the new full range active AC filter developed as a new standard product by the same company, four of them were commissioned at the converter stations of the Neptune Regional Transmission System USA in 2007. These active filters have a 22 MVA multilevel IGBT converter and open new possibilities for harmonic mitigation at HVDC stations but also in other AC applications where such ratings are required.