Simulation design of a multilevel MMC converter based on mathematical model of electronic components with NLM modulation algorithm

Abstract

This paper presents the design of mathematical models for the power circuit and control circuit of the MMC multilevel converter. The research focuses on describing all electronic components of the MMC multilevel converter using mathematical formulas that fully ensure the physical nature and function of the electronic components of the MMC system. As a result, the MMC multilevel converter can be described in the form of a mathematical model. This helps develop tools to verify control algorithms for MMC more conveniently due to the fact that the construction of experimental models as well as HIL simulation of the MMC multilevel converter is difficult because the number of component modules of the multilevel converter is large, exceeding the allowable limit of HIL simulation devices. The process of building mathematical formulas for electronic components and the entire power circuit system as well as the control circuit in this paper is carried out and simulated on LabView software when applying the NLM modulation algorithm to create 2N+1 voltage levels (N is the number of SMs in each branch of the MMC). The results are compared with the MMC model operating on Matlab software with the same scenario of technical parameters to verify the operation of the MMC converter.