Enhancing Simulation Precision of Modular Multilevel Converters Through Hardware-Informed Digital Twin

In many scenarios, most power electronics simulation tools cannot accurately track the output performance of modular multilevel converters (MMCs) during experimental verification. Therefore, this paper presents a digital twin (DT)-driven method leveraging hardware information to improve the simulation precision of MMCs. This DT model, which is developed on the Python/PSCAD co-simulation platform, not only facilitates the processing of experimental data, but also realizes the automatic control of simulation. The design principle of the proposed model is demonstrated using a physical three-phase MMC with carrier phase-shifted pulsewidth modulation (CPS-PWM). The results prove that compared with the traditional simulation model, the voltage and current performance of the DT model aligns more closely with that of the physical system.