基于二阶广义积分器的模块化多电平环流抑制策略研究

Suppression Strategy Study of Modular and Multilevel Circulating Current Based on Second-order Generalized Integrator

针对在高压大功率应用场合,模块化多电平变流器(MMC)子模块级联的特点,使其更多地被关注。环流抑制作为MMC安全运行的1个重要因素,越来越受到关注。本文采用了基于二阶广义积分器的环流抑制策略,可以对2倍频提取更简单,控制效果更优。最后利用MATLAB仿真及实验对所提出的控制算法进行了验证,实验结果证明了其可行性。

For the application place of high voltage and high power,more emphasis on the feature of modular multilevel converters（MMC）sub model cascade is given. The attention to the circulating current control which is an important factor of safe operation of MMC is given. In this paper,the circulating current suppression strategy based on second-order generalized integrator is adopted to make extraction of 2times frequency more simple and the control result much better. Finally,the proposed control algorithm is verified by the use of MATLAB simulation and experiment and the feasibility is proved by the experimental result.