TY JOUR TI SIMULATION OF A CLOSED SYSTEM OF A DC ELECTRIC DRIVE WITH A WIDTH-PULSE CONVERTER KW independent excitation direct current electric drive KW pulse-width converter KW regulator KW automa-tion KW power losses JO Bulletin of the Angarsk State Technical University AU Dunaev, M.P. AU Dovudov, S.U. PY 2022 IS 1 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»