Comparison and Analysis of DSIM and SIMULINK Simulation Based on MMC System

Because of its multi-level output, easy expansion and high modularity, Modular Multilevel Converter (MMC) is increasingly used in many fields such as high-voltage direct current transmission and renewable energy power generation systems. Because there are many switching devices in the MMC system, the electromagnetic interference (EMI) generated by them has a non-negligible impact on the stable operation of the system. At the same time, the current mainstream simulation software is based on time dispersion, and it often takes a long time to simulate power electronic circuits. After adding stray parameters, the circuit exhibits strong rigidity, and the time cost is greatly increased. The DSIM simulation software introduced in this article uses a discrete state event-driven approach, which is different from the previous time-driven approach. This simulation mechanism greatly shortens the time cost and makes the power electronics simulation more convenient. In addition, it can also simulate the transient process of switching devices, so more accurate simulation results can be obtained. This article describes the simulation mechanism of DSIM simulation software and compares the simulation results of DSIM and Simulink to show the outstanding advantages of DSIM software in simulating power electronic circuits.