In order to realize real-time simulation of the modular multilevel converter(MMC)system

an ideal transformer model is used to segment the MMC. To deal with the waveform distortion problem caused by model segmentation delay

a method of error compensation for serial and parallel real-time simulation using interpolation prediction and advance prediction is proposed

respectively. In addition

in order to further improve the calculation speed of sub-module groups after model segmentation

the switching function equivalence model and electromagnetic transient numerical model of MMC sub-module network are proposed

and the difference equation of the output voltage and the capacitor voltage of the sub-module in the numerical model are deduced. Then

taking the 21 level MMC inverter circuit as an example

the above MMC modeling method and the original integral model are compared and analyzed. The results show that the proposed method can effectively improve the stability of the MMC segmentation model featuring very high simulation accuracy. The proposed switching function model and the electromagnetic transient numerical model have very good acceleration effect

and the electromagnetic transient numerical model is in good agreement with the simulation results of the detailed model. The proposed modeling method is applied to the construction of the MMC real-time simulation test platform.