High-voltage pulse generator using sequentially charged full-bridge modular multilevel converter Sub-modules, for water treatment applications

Abstract

This paper proposes a new high-voltage pulse generator (PG) fed from a low-voltage DC supply V(s), which charges one arm of N series-connected full-bridge (FB) modular multilevel converter (MMC) sub-module (SM) capacitors sequentially, through a resistive-inductive branch. By utilising FB-SMs, the proposed PG is able to generate bipolar rectangular pulses of peak NV(s) and unipolar rectangular pulses of either polarity, at high repetition rates. Asymmetrical pulses are also possible. The proposed topology is assessed via simulation and scaled-down experimentation, which establish the viability of the topology for water treatment applications.

Keywords

• water treatment
• HVDC power convertors
• pulsed power supplies
• pulse generators
• power capacitors
• high-voltage pulse generator
• water treatment applications
• PG
• low-voltage DC supply
• bipolar rectangular pulse
• unipolar rectangular pulse
• resistive-inductive branch
• FB-SM
• capacitor
• full-bridge modular multilevel converter sub-modules