基于共模、差模模型的MMC综合控制方案

摘要

根据模块化多电平变换器（MMC）系统中的不同电流分量分别建立共模模型（Common Mode）和差模模型（Dif⁃ferential Mode）。基于以上模型，根据不同频率的电压、电流作用不产生有功功率的原理，利用系统中正交电流成分，实现多层次的子模块能量交换平衡控制，建立全面可靠的MMC系统综合控制策略。实现对系统环流和负载输出电流的跟踪给定控制和子模块直流电容电压的平衡控制。Matlab/Simulink的仿真实验结果证明了基于共模、差模模型和正交电流控制能量交换的综合控制方案对模块化多电平逆变系统电流跟踪控制和功率模块电容电压平衡控制的可行性和可靠性。%The common mode and differential mode of modular multilevel converter system are established according to the different current components in modular multilevel converter(MMC)system. As the effect of voltage and current at different fre⁃quencies does not produce active power exchange,it is possible to use orthogonal current component in the system to achieve the balancing control of sub⁃module energy exchange based on the above modes. The proposed method can achieve the tracking control of the output current and circulating current,and the balancing control of the sub⁃module DC capacitor voltages. The re⁃sults of simulation experiment with Matlab/Simulink verify the accuracy and feasibility of the proposed integrated method.