... input and output IGBT power units in series to obtain MV by means of overlap ... water pump, dust fan, compressor etc.Petroleum&Chemical: Water injection pump, crude oil pump, Compressor, fan, circulation pump, etcUrban water supply: Water delivery pump, water intake pump, water supply pump, sewage treatment industry, self ... MV VFD employs IGBT power units in series, obtaining MV by means of overlap wave ...