Nowe topologie i sterowanie obwodów wejściowych przemienników częstotliwości średniego napięcia umożliwiajace ich szerokie zastosowanie

Paper presents power electronic drives with new topologies. Progress in medium voltage power electronic devices results in development of the converters with intermediate DC link current. Application of controlled converter, on the supply side, (instead of diode rectifier) provides reduction of harmonics of the current delivered to drive. Moreover phase of the current is also under full control. Therefore reactive power consumption is also controlled independently to the load. The drive equipped with current controlled input rectifier may be supplied from source representing low short circuit current. Topology of the supply the new drive from grid and from stand-by low power generation unit is described. After successful developing 800 kW/6kV pump drive a 4 MW/6kV drive system was designed. The new drive is dedicated to replace conventional hydraulic coupling systems.