| Abstract |
In this article, a modulator implementation for the control of a voltage-source inverter with
computed pulse patterns is described. The pulse patterns can be computed using the harmonic
elimination approach. The time critical sections of the modulator functionality are implemented
using programmable logic devices (PLD), which are very similar to field programmable gate
arrays (FPGA). Via a PC bus interface, the PLD is connected to a host processor, which performs
the higher level control tasks. The inverter is built up from three identical phase-modules.
Each phase-module consists of a full-bridge-circuit in three-level topology, and therefore has five
different output voltage levels per phase. With this inverter, diffirent control methods for active
balancing of railway traction power supplies are investigated. |
