ÁP DỤNG PHƯƠNG PHÁP ĐIỀU CHẾ DỊCH PHA PWM CHO BỘ BIẾN ĐỔI ĐA MỨC CÓ CẤU TRÚC MMC

Abstract

The Modular Multilevel Converter (MMC) is a Multilevel Converter that has many advantages for applications for large capacity and high voltage systems such as: generating any desired voltage level with good harmonic quality; withstanding transients within permissible limits when transient waves propagate into the converter. The structure of the MMC is coupled by many Sub-modules (SM) in series with the purpose of reducing the high voltage placed on the semiconductor valves. This article presents the application of PSPWM for MMC. This method is based on comparing the standard sine wave with the out-of-phase delta carrier wave to generate the valve opening and closing signals for the Converter for the purpose of generating a sinusoidal AC voltage form, this is a new point to create a rule when used for MMC to increase the number of levels. The simulation studies of PSPWM for three-phase MMC performed on Matlab-Simulink software showed that the proposed algorithm brings about certain effects in power conversion.
Keywords: Modular Multilevel converter, MMC, modualtion PWM.