High-voltage pulse modular water treatment power supply and control method thereof

Abstract

The invention discloses a high-voltage pulse modular water treatment power supply and a control method thereof, the high-voltage pulse modular water treatment power supply comprises an A unit, first to 2N SM units, a transformer, first to 2N diodes, a first filter and a second filter, the A unit is an A unit of a half-bridge module or an A unit of a full-bridge module, and the SM units are half-bridge MMC modules; and the method further comprises an output voltage error calculation link, a transfer function operation link, a carrier link, a comparison link, a delay link and a driving signal generation link. Stress of a switching device can be reduced while a charging current peak value is suppressed, low-voltage direct-current input has an isolation function, and closed-loop control can be realized to generate bipolar high-voltage pulses only by using one voltage sensor.

Description

technical field [0001] The invention relates to the technical field of converters, in particular to a high-voltage pulse modular water treatment power supply and a control method thereof. Background technique [0002] Recent studies have demonstrated that the application of high-voltage pulses in the kilovolt range (1–100 kV), with pulse durations between nanoseconds and milliseconds, is sufficient for lethal electroporation of harmful microorganisms such as bacteria and large intestines. bacteria) for effective disinfection of water. [0003] There are two main categories of high voltage pulse generators, namely: classical pulse generators and power electronics based pulse generators. The main classical pulse generators include Marx pulse generators, pulse forming networks and Blumlein lines. Power electronics-based pulse generators include non-MMC-based topologies, MMC-based topologies, and hybrid topologies. Among them, non-MMC-based topologies can be further divided in...

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Problems solved by technology

[0005] Luis Lamy Rocha et al. published Multilevel High-Voltage Pulse Generation Based on a New Modular Solid-StateSwitch in IEEE Transactions on Plasma Science in 2014 and proposed a topology based on MMC, which alleviates the need for high-voltage switches and avoids The series connection of non-MMC-based pulse generators is proposed, but the main limitation is that high-voltage DC input is required and the MMC phase arm can only generate bipolar pulses with a peak voltage half of the high-voltage DC input. These limitations can be solved by hybrid topology

[0006] Mohamed A. Elgenedy et al. published the article A Modular Multilevel Voltage-Boosting Marx Pulse-Waveform Generator for Electroporation Applications in IEEE Transactions on Power Electronics in 2019. A hybrid topology is proposed, although only one voltage sensor can be used to achieve closed-loop control to generate dual Polar high-voltage pulses, but lack the necessary isolation function, and the voltage stress of the boost stage and the peak value of the charging current are relatively large, so the requirements for the selection of two-stage devices are relatively high

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