Full range active AC Filter with multilevel IGBT converter for transmission and distribution systems

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.