This is the first of a two-part sequence of papers describing the design and performance of a 30 kVA, 400 Hz transistor inverter to furnish all loads, except propulsion power, on a small advanced urban transit vehicle - a people mover. With a nominal 750 V dc input, the inverter supplies 30 kVA at 0.8 lagging power factor, 200 V line-to-line RMS, 3-phase, 400 Hz output. PART I describes the design and performance of the power circuit, and PART II covers the design and performance of the control. In this first paper, alternate power circuits are briefly discussed, the transistor two-stage inverter scheme chosen is described in some detail and finally, the performance of the system is presented. A novel 20 kHz single pulse-width-modulated inverter is used, which involves three half-bridge inverter circuits connected in series across the 750 V dc input. Each inverter power transformer has an extra secondary winding to supply a clamping diode bridge also connected to the 750 V dc. The three clamping diode bridges provide the means of forcing voltage sharing between the transistors. An electrically isolated dc supply is produced by connecting the 20 kHz inverter transformer main secondary windings in series to a bridge rectifier and L-C filter.
30 kVA transistor inverter auxiliary power supply for people mover: Part I - power circuit
Hilfsstromversorgung mit einem 30-kVA-Transistorumrichter fuer ein Personenbefoerderungssystem: Teil 1 - Leistungsteil
1982
9 Seiten, 18 Bilder, 3 Quellen
Conference paper
English
30 kVA transistor inverter auxiliary power supply for people mover: Part II - control
Tema Archive | 1982
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