A Dual-Layer Back-Stepping Control Method for Lyapunov Stability in Modular Multilevel Converter Based STATCOM

With the high penetration of power electronic loads in grid, stability static synchronous compensator (STATCOM) devices is greatly challenged. However, conventional control methods for modular multilevel converter (MMC) based STATCOM only consider with small signal disturbances. This article proposes a novel dual-layer back-stepping (BSC) MMC-based STATCOM. In first layer, BSC aims to regulate sum capacitor energy and reactive output current. second circulating Therefore, proposed method possesses fast dynamic response accurate tracking Lyapunov Compared arm-control-based inverters, has simplified structure reduced computation burden. Moreover, realizes independent between current The simulation experimental results verify effectiveness method. addition, its robustness toward different circuit parameters operation ability under unbalanced grid fault also verified.