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Yue Bing-yan,Cheng Qi-ming,Cheng Yin-man,Lai Yu-sheng 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.4
To ensure the robustness of the fractional frequency transmission system (FFTS), the ability of Y-type modular multilevel converters (Y-MMC) to operate under unbalanced operating conditions is essential. The Y-MMC controlled by traditional linear strategy has low robustness, high harmonics, low accuracy, and other disadvantages. In order to solve those problems, a passive sliding mode control strategy is proposed for Y-MMC in this paper. First, design a passivity-based controller based on the Euler–Lagrange (EL) model of Y-MMC, prove its stability using Lyapunov's theorem, combine the passivity-based controller with the sliding mode controller to derive a mathematical expression for the passive sliding mode control so that can enhance the robustness. Then, the modules of control target design, reactive power distribution, and modulation degree allocation are described. Finally, extensive MATLAB/Simulink platform simulation and RT-LAB platform experiments were conducted in different scenarios to verify the feasibility of the proposed method. This strategy improves the power quality indices under non-ideal conditions. It has better advantages than the traditional PI controller and passivity-based control in the accuracy and robustness of power transmission.
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