TY CONF TI COMPARATIVE ANALYSIS OF AUTOMATIC AC REGULATION SYSTEMS IN MOBILE ELECTRICAL UNIT APA–5D AND APA–100 KW mobile power units KW automatic control system KW magnetic amplifiers KW pulse–width modulation JO MODERN SYSTEMS AND TECHNOLOGIES IN TRANSPORT: PROBLEMS AND PROSPECTS - 2025 AU Penkov, N.A. AU Prokofiev, M.A. PY 2025 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov