Abstract
The development of Modular Multilevel Converter (MMC) technology is a breakthrough in the field of High and Medium Voltage applications. In general, simulations are needed to study a new application and to analyze the impact of a new converter in power systems. Thus, accurate models able to represent the dynamics present in the converter are required. This work aims to compare two MMC average models and one average model with three modulation strategies in order to propose high level models, able to represent the MMC dynamics, such as the injected active and reactive power, and the SMs capacitor voltages, without the necessity of switching models. A case study is presented considering a Double Star (DS) MMC, connected in a distribution system during an unbalanced voltage sag. The results shows that considering MMC average models only the steady state can be represented. On the other hand, when the modulation techniques are considered together with the MMC average models, it is possible to represent the capacitor voltage ripples and the grid current ripples increasing slightly the necessary processing time.
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