LOW - frequency currents in intermediate DC circuit of voltage inverter

Abstract

The work deals with circumstances of generation of low - frequency currents in DC link of voltage fed inverters with asynchronous modulation at DC traction vehicles. These frequencies are insufficiently attenuated by input LC filter and eventually they can correspond to its natural frequency. An analysis if their generation is performed and magnitudes and frequencies are introduced on particular example. An impact of different modulations is also considered.