Digital control technique for multi-module current source converter

Three-phase current source PWM converters require tri-logic PWM control technique. From the point of view of digital control, implementation of tri-logic PWM, especially for multi-module current source converters (CSC’s), is much more complex than that for a single CSC. Aiming at digital controls of multi-module CSC’s, the digital solution of tri-logic SPWM scheme is investigated in this paper. A tri-logic carrier phase-shifted SPWM control system is presented based on DSP and FPGA hardware platform. The fully digital control of the multi-module CSC’s is realized. The experiment on a three-module current source inverter (CSI) with carrier phase-shifted SPWM gives the verification.