TY JOUR TI Improvement of Regulating Properties of DC Electric Trains with Pulse Converters KW pulse converter KW DC electric train KW regenerative braking KW frequency characteristics JO Proceedings of Petersburg Transport University AU Maznev, A.S. AU Kalinina, A.A. AU Volov, A.V. AU Telichenko, S.A. AU Sapozhnikov, L.A. PY 2022 IS 19 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"