YAN Xinyang,YAO Li,ZHANG Bingda,et al.Real-time Simulation of Modular Multilevel Converter Based on Diversity Equivalent of Module Group[J].Automation of Electric Power Systems,2021,45(12):142-150.
YAN Xinyang,YAO Li,ZHANG Bingda,et al.Real-time Simulation of Modular Multilevel Converter Based on Diversity Equivalent of Module Group[J].Automation of Electric Power Systems,2021,45(12):142-150. DOI: 10.7500/AEPS20201020004.
Real-time Simulation of Modular Multilevel Converter Based on Diversity Equivalent of Module Group
The modular multilevel converter (MMC) with two-port sub-modules has many switching devices and complex operation modes. In order to solve this problem
this paper proposes a real-time simulation method based on the diversity equivalent of module groups. By analyzing the working mode of the two-terminal connection between sub-modules on the bridge arm
the port simplification process is deduced. Then
the concept of module groups is established
and the single-port Thevenin’s equivalent model is used to simplify the calculation. To expand the simulation scale of the converter station
the bridge arm of the converter station is decoupled by static segments on the basis of module group analysis. In each static segment
a diversity equivalent model is used to calculate the module group with the changed structure after segmentation. The bus voltage method is used to complete the simulation calculation between static segments. In order to determine the optimal number of static segments of the bridge arm
the calculation amount after bridge arm segmentation is quantitatively analyzed. Through the real-time simulation platform based on the field programmable gate array (FPGA)
the advancement of the simulation method and the correctness of the simulation results are verified.
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